Articoli di riviste: "Machine tools testing"

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Knapp, W., e A. Wirtz. "Testing Rotary Axes on NC Machine Tools". CIRP Annals 39, n. 1 (1990): 549–52. http://dx.doi.org/10.1016/s0007-8506(07)61116-0.

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Gao, Qian, e Pingchuan Zhang. "The Errors Recognition and Compensation for the Numerical Control Machine Tools Based on Laser Testing Technology". Open Physics 17, n. 1 (31 dicembre 2019): 857–62. http://dx.doi.org/10.1515/phys-2019-0090.

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Abstract To improve the accuracy of numerical control machine tools error, this paper studies the application of laser testing technology in numerical control machine tool, and put forward a laser interferometer automatic aiming system which can conduct space error measurement. The system, in the process of the NC machine tool operating, can measure the machine tool space curve through changing the direction of the laser. The principle of laser interferometer and matlab analysis are adopted, through the experiment of laser interference technology in the numerical control machine tool, the law curve of error in NC machine tools is obtained, getting the method of error of NC machine tools. When conducting laser testing error experiment in NC machine tool, the results show that the laser testing can measure aggregated error and thermal error of NC machine tool better, with small control of environment and high accuracy of measurement.

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Luo, Bo, Bin Li, Xin Yong Mao e Hui Cai. "Modal Testing for Heavy Machine Tool Using Active Excitation". Applied Mechanics and Materials 536-537 (aprile 2014): 1326–32. http://dx.doi.org/10.4028/www.scientific.net/amm.536-537.1326.

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For application in large machine tools, the machined part quality, accuracy as well as machining speed depende greatly on the dynamics of the structure. In this paper, an active-excitation modal analysis (AEMA), using inertial force of the moving slider to excite the structural modes, is proposed. Modal parameters of the machine tool structure estimated by AEMA are experimentally validated. Since the artificial excitation produced by elaborate excitation equipment is replaced by the inertial force of the slider, the proposed method is much more practical and economical than traditional methods.

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Xue, Rui, Chang Ning Guo, Xiao Xin Yang e Jing Yu Pei. "The Function Deployment of EDM Machine Tools". Key Engineering Materials 447-448 (settembre 2010): 242–46. http://dx.doi.org/10.4028/www.scientific.net/kem.447-448.242.

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This paper addresses the further developing and utilizing about the functions of EDM machine tool on the basis of researching the numerical controls of EDM machine tool itself. Experiments of testing critical gap distances, single pulse discharges and single pulse discharge gap distances have been performed by the machine tool without any extra help of auxiliary instruments or equipments. The measuring accuracy and repeated testing accuracy is the numerically controlled displacement precision of the machine tool itself. The development of this function would have a great impact on enlarging the utilizations of EDM machine tools, on evaluating the behavior of EDM effectively and on designing the jumping displacement of electrodes reasonably.

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Atedi,, Bimbing, Djoko Agustono e Zainulsyah Zainulsyah. "PENGUJIAN KETELITIAN GEOMETRIK MESIN POTONG PELAT LOGAM DENGAN PENGARAH PISAU PARALEL DENGAN MENGGUNAKAN SNI 05-1192-1989". Jurnal Standardisasi 8, n. 3 (1 novembre 2008): 137. http://dx.doi.org/10.31153/js.v8i3.669.

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Testing of the geometrical accuracy of machine tool is one of the important factors in order to know whether the machine can produce a product that fulfills the technical requirement. A testing of shearing machine with parallelism guidance tools was conducted in this research. Testing was carried out based on SNI 05-1192-1989 about the method of testing of accuracy of shearing machine in the final state or without any load. The testing comprised of leveling, tool parallelism, guidance slot and thickness tools frame and the parallelism lower tool and faces limit. The result of the testing shows that those are some deviations which might be caused by the wear of the components. The geometrical deviation has exceeded the tolerance limit; it means that some improvement steps are needed. One of the improvement steps is re-set the machine. Another alternative is using the machine only for producing a lower accuracy product.

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Woźniak, Monika, e Paweł Majda. "Reproducibility of machine tools’ circularity test according to ISO 230-4 with respect to testing position". Archives of Mechanical Technology and Materials 37, n. 1 (26 gennaio 2017): 22–26. http://dx.doi.org/10.1515/amtm-2017-0003.

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AbstractIn this paper circularity of three different machine tools by Virtual Machine was analyzed. To get circularity we make a ball bar test according to ISO 230-4. The test is very common in engineering for a quick diagnostic Computerized Numerical Control (CNC) technical conditions. We implemented earlier calculations of Volumetric Error in our Virtual Machine. Then we simulated testing of circularity of CNC machine tools. The place to take the test was chosen randomly from Uniform Distribution in three different kinds of machine tools. Those machines had different characteristics of kinematic errors and squareness and also different sizes of working space. We observed significant differences in the indicator (circularity) depending on the place where the test was taken. Moreover we showed that there was no reason to take the test in the center of working table.

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Semko, Roman. "Machine learning for robo-advisors: testing for neurons specialization". Investment Management and Financial Innovations 16, n. 4 (9 dicembre 2019): 205–14. http://dx.doi.org/10.21511/imfi.16(4).2019.18.

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The rise of robo-advisor wealth management services, which constitute a key element of fintech revolution, unveils the question whether they can dominate human-based advice, namely how to address the client’s behavioral biases in an automated way. One approach to it would be the application of machine learning tools during client profiling. However, trained neural network is often considered as a black box, which may raise concerns from the customers and regulators in terms of model validity, transparency, and related risks. In order to address these issues and shed more light on how neurons work, especially to figure out how they perform computation at intermediate layers, this paper visualizes and estimates the neurons’ sensitivity to different input parameters. Before it, the comprehensive review of the most popular optimization algorithms is presented and based on them respective data set is generated to train convolutional neural network. It was found that selected hidden units to some extent are not only specializing in the reaction to such features as, for example, risk, return or risk-aversion level but also they are learning more complex concepts like Sharpe ratio. These findings should help to understand robo-advisor mechanics deeper, which finally will provide more room to improve and significantly innovate the automated wealth management process and make it more transparent.

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Xiang, Sheng Hua, e Hai Feng Lin. "Research on Roundness Error Measurement and Separation Method of NC Machine Tools". Applied Mechanics and Materials 336-338 (luglio 2013): 988–94. http://dx.doi.org/10.4028/www.scientific.net/amm.336-338.988.

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This paper first introduces the trajectory mode of the each error source in detection the roundness error of NC machine tool. The error separation algorithm is derived according to the relationship between the various error sources and the machine tool motion trajectory. Based on the two testing link under different condition, comparing the test results under two testing conditions, the main error source of NC machine tools is further analyzed. According to the merits and demerits of the two kinds of detection methods, the different round error detection method can be chosen under different occasions.

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Xue, Yu Xia, Gui Xiang Shen, Ying Zhi Zhang e Li Quan Guo. "Maintainability Modeling of NC Machine Tools Based on Repair Time". Advanced Materials Research 1006-1007 (agosto 2014): 494–97. http://dx.doi.org/10.4028/www.scientific.net/amr.1006-1007.494.

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According to 62 field fault data from a certain type of 8 NC machine tools, maintainability distribution model is established based on the repair time. Hypothesis testing shows that the repair times of NC machine tools fit mathematical model of lognormal distribution. This provides the basis for maintainability assessment of NC machine tool as well as the development of maintenance strategy in the future.

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Xue, Yu Xia, Wen Xu e Jun Hong Li. "Reliability Modeling on Time between Failures of NC Machine Tools". Advanced Materials Research 1028 (settembre 2014): 145–50. http://dx.doi.org/10.4028/www.scientific.net/amr.1028.145.

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A reliability modeling method is proposed based on the time between failures of NC machine tools. According to the field data of the time between failures of a certain type of NC machine tools, parameter estimation of reliability model is made by use of particle swarm optimization (PSO)-based correlation coefficient optimization method, and it is proved that time between failure of CNC machine tool obeyed mathematical model of 3-parameter Weibull distribution via hypothesis testing. This provides the basis for reliability assessment of NC machine tool as well as the development of maintenance strategy in the future. Meanwhile, it also provides a theoretical reference for the reliability prediction of the whole NC machine tool.

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Weisdiyanti, Nurhikmah, Kiki Santoso, Riri Syavira, Liza Karina Octovyanda Pohan, Rionaldo Tamba e Rita Juliani. "DESIGN OF A PINEAPPLE LEAF FIBER DECORTICATOR MACHINE". Jurnal Geliga Sains: Jurnal Pendidikan Fisika 7, n. 1 (25 luglio 2019): 18. http://dx.doi.org/10.31258/jgs.7.1.18-23.

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The manufacture of pineapple leaf fiber decorticator machines has been made in the village of Onan RungguIII, Sipahutar District, North Tapanuli Regency. Machine making aims to help pineapple farmers toovercome the problem of waste and pineapple. The method used starts from feasibility studies, designingmachines, collecting and purchasing tools and materials, evaluating results and testing tools. Resultsobtained by the pineapple leaf fiber decorticator machine 0,12 kg/hour obtained through two stages ofgrinding namely grinder 1 and grinder 2. The final results obtained from the decorticator machine ofpineapple leaf fiber are pineapple leaf fibers that can be used to make raw materials for textile products.

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Jywe, W. "Study using position silicon detectors for performance testing of computer numerically controlled machine tools". Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture 216, n. 5 (1 maggio 2002): 725–33. http://dx.doi.org/10.1243/0954405021520418.

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In this paper, various contouring test systems for computer numerically controlled (CNC) machine tools are reviewed. It is the first time a laser diode and a quadrant sensor have been employed to build a simple contouring measuring system for testing dynamic performance of a CNC machine tool. The experimental work on a CNC machine tool with a Fanuc OM controller for various contouring paths under specified feed rates is carried out. Then, the compensation work is executed with the assistance of this developed contouring system. After the compensation, the contouring error, especially at a high feed rate and small radius, is reduced significantly.

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Ariyanto, Ariyanto, e Husman Husman. "Pengukuran Kesilindrisan Hasil Proses Pemotongan Mesin Bubut Untuk Mengetahui Kemampuan Mesin Menghasilkan Suatu Produk". Manutech : Jurnal Teknologi Manufaktur 10, n. 02 (17 maggio 2019): 9–13. http://dx.doi.org/10.33504/manutech.v10i02.61.

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The ability of machine tools to produce a product of good quality is needed by the industrial industry that exists today. Industrial industries that use machine tools are not only industries that produce products in the form of a tool or machine, machine tools are also widely used by industries or institutions that serve machine repair and providers of skills training. The quality of the machine measured using the geometry of the workpiece resulting from the machining process can be in the form of roundness, cylindrecity, tapers and other geometric shapes. The use of machine tools that continue for several years can result in a decrease in the ability of the machine to produce a product. The use of a long horizontal doall lt13 lathe will produce a form of workpiece cylindricity that is not the same as the condition of the the new machine tools, therefore testing activities are carried out by cutting the machine and seeing what the cylindrical value of the specimen is capable of achieving . From the results of the testing that has been carried out on a horizontal lathe as many as eight units, the values of cylindrical difference are different for each machine. The highest value of cylindricity is produced by lathes with machine number 8 and the smallest cylindrical value produced by lathes with machine number 3. The greatest tolerance is achieved in the quality of IT (international tolerance) 11 tolerance and the lowest is achieved in IT tolerance quality 10.

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Salam, Abdul, Muh Iswar, Bensar Pali, Agustinus Anggai e Janchristo Rantemangnga. "Modifikasi Alat Pemintal Benang Sutera Untuk Industri Rumah Tangga". Jurnal Sinergi Jurusan Teknik Mesin 17, n. 1 (5 maggio 2019): 101. http://dx.doi.org/10.31963/sinergi.v17i1.1599.

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This study aims to determine the yarn spinning time, spinning equipment manufacturing costs, and haspel shaft spinning. Basic design is done by data collection, direct visits to the silk farmers' groups, tool design, tool manufacturing, performance testing tools, analysis, calculating costs and tool manufacturing. In accordance with the testing of the spinning machine, the total working time is 8 hours / day for 3.36 kg of silk yarn, the spinning equipment manufacturing cost is Rp. 5,102,534.71. Whereas BEP is achieved when the sale of spinning machines is at least 1 unit / month or when income is Rp. 5,621,064.

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Zhang, Yao Man, Yong Chen e Hu Li. "Temperature Field Analysis and Thermal Error Testing for CNC Machine Tool's Headstock". Advanced Materials Research 889-890 (febbraio 2014): 316–20. http://dx.doi.org/10.4028/www.scientific.net/amr.889-890.316.

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The dynamic and thermal characteristics of spindle assembly will affect the final machining performance of a machine tool seriously. It is of great significance to study the dynamic and thermal characteristics of the spindle assembly for improving the level of machine tool's design and manufacturing. The paper takes a high precision computer numerical control lathe as the research object. First the thermal characteristics were obtained by using finite element method. Then the laser triangle measuring instrument and the infrared thermal imager were used to measure the temperature field and thermal deformation of the spindle assembly. Finally in order to get the thermal equilibrium time and the thermal deformation data of spindle system, the wavelet toolbox was used to deal with thermal testing data. The paper's work laid a foundation for the further research on the thermal characteristics analysis and thermal error's compensation of machine tools.

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Wang, Zhi Ming. "Reliability Assessment Test Design for Numerical Control Machine Tools". Advanced Materials Research 542-543 (giugno 2012): 1218–21. http://dx.doi.org/10.4028/www.scientific.net/amr.542-543.1218.

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According to the required interval estimation precision of mean time between failures (MTBF) and reliability for numerical control (NC) machine tools, where failure processes can be described by the power law process model, the minimal testing truncated time and sample size of the reliability assessment test are given using Fisher information matrix method. The results show that there are two main factors which affect the truncated time and sample size. They are the log ratio of upper bound to lower bound and confidence of interval estimation for reliability indices, respectively. Among them, the minimal sample size increases significantly as the improvement of required precision of interval estimation for reliability indices and confidence increases, but the minimal testing truncated time is less affected by these two factors.

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Motallebia, A., A. Doniavi e Y. Sahebi. "An Analysis and Modeling of the Dynamic Stability of the Cutting Process Against Self-Excited Vibration". Mechanics and Mechanical Engineering 23, n. 1 (10 luglio 2019): 28–35. http://dx.doi.org/10.2478/mme-2019-0005.

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Abstract Chatter is a self-excited vibration that depends on several parameters such as the dynamic characteristics of a machine tool structure, the material of work piece, the material removal rate, and the geometry of tools. Chatter has an undesirable effect on dimensional accuracy, smoothness of work piece surface, lifetime of tools and machine tools. Thus, it is useful to understand this phenomenon in order to improve the economic aspect of machining. In the present article, firstly, the theoretical study and mathematical modeling of chatter in the cutting process were carried out. Then, by performing modal testing on a milling machine and drawing chatter stability diagrams, we determined the stability regions of the machine tool operation and recognized the parameter that had the most important effect on chatter.

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Mukbil, Awad, Umut Durak e Sven Hartmann. "Conformance testing of FMI calling sequence for simulation environments". International Journal of Modeling, Simulation, and Scientific Computing 10, n. 02 (aprile 2019): 1950008. http://dx.doi.org/10.1142/s1793962319500089.

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Exchanging simulation models is currently of utmost importance. To improve interoperability between suppliers and original equipment manufacturers (OEMs), the functional mock-up interface (FMI) is exchanged in a standard format called functional mock-up unit (FMU). Since its first release, many simulation tools took the initiative to support FMI. However, since then, there have been many complaints stating that exchanging models via FMI does not work as stable as expected. The reason usually turned out to be the implementation of tool vendors that sometimes fail to comply with the standard fully. This paper introduces a methodology for testing FMI compliance of importing simulation tools using a set of reference FMUs. The standard defines the implementation of FMI functions calling sequence in a state machine. Therefore, conformance testing (also called fault detection) from automata theory is utilized to produce reference FMUs based on the FMI state-machine.

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Bretschneider, Jochen, e Thomas Menzel. "Virtual Optimization of Machine Tools and Production Processes". International Journal of Automation Technology 1, n. 2 (5 novembre 2007): 136–40. http://dx.doi.org/10.20965/ijat.2007.p0136.

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Faster development of innovative machine tools, shorter processing times, improved surface quality of workpieces, higher machine productivity – these are just a few of the wishes and demands of machine manufacturers and end-users. Time-to-market is decisive; in some industries, six months too late on the market can already be decisive in losing the race for market leadership. The key to success lies in virtual techniques. These are an extremely cost-effective way to increase productivity in all phases of the machine tools life cycle. Siemens AG, the leading provider for control and drive technology, sees itself as a partner for the whole machine tool industry and offers four phases of simulation support which cover the entire life cycle of a machine: Mechatronic Support for simulation for machine development, Machine Simulator for supporting commissioning, Virtual Production for the optimization of production and, finally, Virtual NC Kernel (VNCK) for the testing of NC part programs at the end-user.

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Shasheekant, Sawant Akshay. "Analyzing the Vibration Effect of Cutting Tool on Surface Roughness of Turning Work Piece in Lathe Machine". International Journal for Research in Applied Science and Engineering Technology 9, n. VII (20 luglio 2021): 1654–57. http://dx.doi.org/10.22214/ijraset.2021.36446.

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Tool condition observation systems area unit essential in small milling applications. A tool's slenderness needs high-precision observation systems for on-line measurements. In most cases, tool health is indirectly calculable by process and analyzing the cutting method parameters cutlery wear may be a essential development that influences the standard of the machined half. Vibration signals from metal cutting processes are investigated for varied functions, together with in-process tool wear monitoring. Reducing the machining energy consumption (MEC) of machine tools for turning operations is important to market manufacturing producing. during this study, the link between vibration and gear wear is investigated throughout high-speed dry turning by victimization applied math parameters. it's aimed to show however tool wear and therefore the work piece surface roughness changes with tool vibration signals. For this purpose, a series of experiments were conducted in a lathe machine. Modal analysis of each traditional and wear cutlery are going to be perform for locating Natural frequency of cutting tools in ANSYS 19 code. Experimental testing of cutlery are going to be perform using FFT instrument. afterward the comparative analysis are going to be dispensed between the experimental and analysis results and afterward the result & conclusion are going to be drawn.

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Motallebia, A., A. Doniavi e Y. Sahebi. "An Analysis and Modeling of the Dynamic Stability of the Cutting Process Against Self-Excited Vibration". Mechanics and Mechanical Engineering 22, n. 4 (2 settembre 2020): 1287–300. http://dx.doi.org/10.2478/mme-2018-0099.

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AbstractChatter is a self-excited vibration which depends on several parameters such as the dynamic characteristics of the machine tool structure, the material of the work piece, the material removal rate, and the geometry of tools. Chatter has an undesirable effect on dimensional accuracy, smoothness of the work piece surface, and the lifetime of tools and the machine tool. Thus, it is useful to understand this phenomenon in order to improve the economic aspect of machining. In the present article, first the theoretical study and mathematical modeling of chatter in the cutting process were carried out, and then by performing modal testing on a milling machine and drawing chatter stability diagrams, we determined the stability regions of the machine tool operation and recognized that witch parameter has a most important effect on chatter.

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Jamil, Norlida, Ahmad Razlan Yusoff e Muhammad Hatifi Mansor. "Experimental Study of the Static Modal Analysis on Milling Machine Tool". Advanced Materials Research 903 (febbraio 2014): 123–28. http://dx.doi.org/10.4028/www.scientific.net/amr.903.123.

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Machine tool vibrations have great impact on machining process. Modal testing is a form of vibration testing which is able to determine the Frequency Response Function (FRF) of the mechanical test structures. In this paper, the main focus is to identify a procedure to obtain natural frequency values for machine tool components in order to establish better conditions in the cutting process on the machine tool. For this purpose, a 3D model of the machine tools structure is made using design software and exported to analysis software. Later on, the Finite Element Method (FEM) modal analysis was used to obtain the natural frequencies. The model is evaluated and corrected through an experimental modal test. In the experiment, the machine tool vibration is excited by impact hammer and the response of excited vibration is recorded. In the end, the result of both FEM and experimental shows a good consistency in comparison.

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Xu, Yang, Jian Mao e De Jia Chen. "Study on Thermal Error Measurement Model of Small Precision Machine Tools". Applied Mechanics and Materials 741 (marzo 2015): 789–92. http://dx.doi.org/10.4028/www.scientific.net/amm.741.789.

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Taking the effect of geometric errors on machining accuracy into consideration in the design of small precision machine tools, the thermal errors become the main factor affecting the machining accuracy of machine tools. Currently, how to quickly and effectively evaluate the impact of thermal error on machining precision, in order to make effective thermal error prediction and compensation method, is needed to solve for small precision machining. Based on stepwise regression algorithm theory, combined with the DBB measured and analyzed on MATLAB in this paper, a better thermal error fitting regression formula is obtained. Meanwhile, this mathematical model approach is also applicable in a variety of other areas, such as machine tool thermal error analysis, compensation and testing etc.

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Archenti, Andreas, Mihai Nicolescu, Guillaume Casterman e Sven Hjelm. "A New Method for Circular Testing of Machine Tools Under Loaded Condition". Procedia CIRP 1 (2012): 575–80. http://dx.doi.org/10.1016/j.procir.2012.05.002.

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Yamazaki, Takanori, e Takahito Sato. "Prototype and Evaluation of Cutting Force Testing Machine for Hand Work Tools". IOP Conference Series: Materials Science and Engineering 507 (24 aprile 2019): 012035. http://dx.doi.org/10.1088/1757-899x/507/1/012035.

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Chen, J. S., e G. Chiou. "Quick testing and modeling of thermally-induced errors of CNC machine tools". International Journal of Machine Tools and Manufacture 35, n. 7 (luglio 1995): 1063–74. http://dx.doi.org/10.1016/0890-6955(94)00101-o.

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Saiki, Tomoyuki, Masaomi Tsutsumi, Hiroshi Suzuki, Masahide Kouya e Masaki Ushio. "Development of Measurement for Motion Accuracy of 5 Axis NC Machine Tool". International Journal of Automation Technology 2, n. 2 (5 marzo 2008): 111–18. http://dx.doi.org/10.20965/ijat.2008.p0111.

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In terms of the realization for high accurate and effective machining of complicated shape having under cut shape and free formed surface, five axis controlled machine tools become indispensable because they have any tool position and attitude to avoid the collision between machine tool elements and work piece. In order to estimate the motion accuracy of NC machine tool, various kinds of certificate methods like circular cone cutting test prescribed with NAS and DBB method using the circular motion have been developed and standardized. These methods are mainly used for the motion testing of three-axis NC machine tools and therefore new method and measuring equipment for five-axis NC machine tool is needed. This study aims at developing the motion accuracy measurement system which can measure various kinds of motions like linier motion, circular motion and continuous curved motion under simultaneous five-axis controlling and establishing the compensate method of tool motion. Consideration is added from the viewpoint of motion accuracy using measurement system developed in this report in case simultaneous five-axis control motion command value from CL data.

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Xie, C., Werner Roddeck, Chun Shi Liu e Wei Min Zhang. "The Analysis and Research about Temperature and Thermal Error Measurement Technology of CNC Machine Tool". Key Engineering Materials 392-394 (ottobre 2008): 40–44. http://dx.doi.org/10.4028/www.scientific.net/kem.392-394.40.

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The existing problems of temperature measurement for CNC machine tool are pointed out through analyzing research results of temperature measurement methods, temperature measurement points optimum and temperature variables selection technology. The devices and properties of contact and non-contact temperature measurement are compared and evaluated. The error measurement devices and their technology development of CNC machine tool are described. The measurement methods and results of temperature and error are analyzed by testing on a concrete CNC machine tool. It is concluded that some objective rules exist in various machine tools. The locations of sensitive points for temperature and errors as well as its number can be defined.

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Baidilah, Arif, Kardiman Kardiman e Farradina Choria Suci. "Rancang Bangun Mesin Penggiling Sekam Padi Menjadi Bahan Pakan Ternak (Dedak)". Jurnal Teknik Mesin 14, n. 1 (8 giugno 2021): 22–26. http://dx.doi.org/10.30630/jtm.14.1.464.

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In the development of technology and industry, a lot of tools are made to make it easier to do work. In the farming sector, a lot of tools are needed to facilitate development in the farming sector. One of the tools needed is a machine to make animal feed. One of the ingredients for making animal feed is bran, bran produced from the process of milling rice husks. To produce bran, a tool that can crush rice husks into the form of flour is designed to make animal feed suitable, as well as make the shape of a portable grinding machine. In this design, data collection steps were carried out with literature studies and after that carried out experiments on the manufacture of rice husk grinding machines. In conducting the experiment, the concept of design, design, calculation, manufacture and testing of grinding machines was also carried out. The result of this design is the design of a grinding machine and a grinding machine that can smooth rice husks into flour and portable forms. The specifications of the rice husk grinding machine are a frame with a length of 580 mm, a width of 380 mm and a height of 995 mm. Drive source 7 HP petrol motor with belt pulley transmission. The speed of the grinding blade shaft can be changed by replacing the pulley on the driving motor so that it can determine the fineness of the bran and the speed of the grinding. As well as the filter on the milling section can be replaced in order to adjust to the required level of fineness.

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Antonov, Arcadiy Yu, e Dmitriy P. Danilaev. "Electromagnetic compatibility in CNC machines upgrade". Physics of Wave Processes and Radio Systems 23, n. 3 (27 dicembre 2020): 90–96. http://dx.doi.org/10.18469/1810-3189.2020.23.3.90-96.

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Abtract One of the types of modernization of CNC machines is the replacement of outdated electronic control units with more functional and compact ones, made on a modern element base. However, in the course of work on the modernization of CNC machines, characteristic problems of electromagnetic compatibility arise. The report examines the features of the electromagnetic compatibility of equipment, blocks and assemblies of CNC machines during modernization. Based on the analysis of the factors characterizing the electromagnetic environment, typical failures of the electronic part of the control system of a CNC machine tool during testing, the need for the development of measures to ensure EMC is shown. All measures to ensure electromagnetic compatibility are not intended to reduce degradation, but to ensure the full implementation of all equipment functionality. General solutions are proposed that are applicable to the modernization of most second-generation CNC machine tools.

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Cervantes Villanueva, Javier, Gerardo Ganis, Dmitri Konstantinov, Grigorii Latyshev, Pere Mato Vila, Patricia Mendez Lorenzo, Rafal Pacholek e Ivan Razumov. "Building, testing and distributing common software for the LHC experiments". EPJ Web of Conferences 214 (2019): 05020. http://dx.doi.org/10.1051/epjconf/201921405020.

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Building, testing and deploying of coherent large software stacks is very challenging, in particular when they consist of the diverse set of packages required by the LHC experiments, the CERN Beams Department and data analysis services such as SWAN. These software stacks include several packages (Grid middleware, Monte Carlo generators, Machine Learning tools, Python modules) all available for a large number of compilers, operating systems and hardware architectures. To address this challenge, we developed an infrastructure around a tool called lcgcmake. Dedicated modules are responsible for building the packages, con-trolling the dependencies in a reliable and scalable way. The distribution relies on a robust and automatic system, responsible for building and testing the packages, installing them on CernVM-FS and packaging the binaries in RPMs and tarballs. This system is orchestrated through Jenkins on build machines provided by the CERN Openstack facility. The results are published through user-friendly web pages. In this paper we will present an overview of these infrastructure tools and policies. We also discuss the role of this effort within the HEP Software Foundation (HSF). Finally we will discuss the evolution of the infrastructure towards container (Docker) technologies and the future directions and challenges of the project.

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Fu, Tie, Qi Xun Yu e Si Qin Pang. "Study on Characteristics and Principium of Rare Earth Carbide Tools". Materials Science Forum 532-533 (dicembre 2006): 101–4. http://dx.doi.org/10.4028/www.scientific.net/msf.532-533.101.

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Carbide tools play key roles in present machine manufacture. The mechanical property and cutting performance of carbide tools are improved obviously when adding micro rare earth (RE) elements into carbide tools. By means of some apparatus, such as materials testing machine, Scanning Electron Microscope (SEM), dynamometer, microscope and electron probe microanalyser, the traditional and RE carbide tools, P30 (YT5 and YT5R), P20 (YT14 and YT14R), M10 (YW1 and YW1R), K30 (YG8 and YG8R), are studied and compared by doing a lot of experiments. These experiments show that the bending strength, fracture toughness and anti-impact capability of RE carbide tools are improved remarkably, and their hardness increased a little. Moreover, the cutting force, tool-chip friction coefficient and wear of RE carbide tools decreased in cutting. In addition, the effect and cutting principium of RE element to carbide tools are analyzed and discussed, which is beneficial to the research and application of RE carbide tools.

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Al-Shalabi, Riyad, Ghassan Kanaan, Huda Al-Sarhan, Alaa Drabsh e Islam Al-Husban. "Evaluating Machine Translations from Arabic into English and Vice Versa". International Research Journal of Electronics and Computer Engineering 3, n. 2 (24 giugno 2017): 1. http://dx.doi.org/10.24178/irjece.2017.3.2.01.

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Abstract—Machine translation (MT) allows direct communication between two persons without the need for the third party or via dictionary in your pocket, which could bring significant and per formative improvement. Since most traditional translational way is a word-sensitive, it is very important to consider the word order in addition to word selection in the evaluation of any machine translation. To evaluate the MT performance, it is necessary to dynamically observe the translation in the machine translator tool according to word order, and word selection and furthermore the sentence length. However, applying a good evaluation with respect to all previous points is a very challenging issue. In this paper, we first summarize various approaches to evaluate machine translation. We propose a practical solution by selecting an appropriate powerful tool called iBLEU to evaluate the accuracy degree of famous MT tools (i.e. Google, Bing, Systranet and Babylon). Based on the solution structure, we further discuss the performance order for these tools in both directions Arabic to English and English to Arabic. After extensive testing, we can decide that any direction gives more accurate results in translation based on the selected machine translations MTs. Finally, we proved the choosing of Google as best system performance and Systranet as the worst one. Index Terms: Machine Translation, MTs, Evaluation for Machine Translation, Google, Bing, Systranet and Babylon, Machine Translation tools, BLEU, iBLEU.

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del Prete, Antonio, Gabriele Papadia e Teresa Primo. "Bending Testing Rig Development through CAE Tools Application". Key Engineering Materials 504-506 (febbraio 2012): 803–8. http://dx.doi.org/10.4028/www.scientific.net/kem.504-506.803.

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Bending can be considered one of easier sheet metal forming processes. In fact, it represents one of the basic variants of applied deformations to metal blanks. However, the numerous research contributions dedicated to sheet metal bending that have been published over the past decade and the constant stream of announcements by R&D departments of machine constructors are strong indications that not all research challenges related to sheet metal bending have been done. This paper reports the developed activity carried out to design a bending testing rig characterized by: a working horizontal axis, a maximum bending length equal to 200 mm, a maximum applicable force equal to 80 kN. A partitioned blankholder has also been designed to allow bending operations on tailored blanks. Moreover, a Graphical User Interface hollows to set up the process parameters and the acquisition of testing data (Temperature and/or Force as function of the process time or punch stroke). CAE tools application had a strategic role to develop the best layout and to find the optimum solutions for the process variables tuning. CAE techniques have allowed to investigate and verify different layout solutions both for the bending process and the structural components of the tooling.

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Zhang, Ke, Zheng Xing Cui, Li Ya Gai, Peng Ge e Dong Gao Cai. "NC Machine Position Accuracy Testing and NC System Error Compensation Analysis". Applied Mechanics and Materials 130-134 (ottobre 2011): 2316–20. http://dx.doi.org/10.4028/www.scientific.net/amm.130-134.2316.

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NC machine plays an irreplaceable role in the modern manufacturing because of its high machining processing accuracy, quality stable, flexibility. Through using the Renishaw ML10 laser interferometer detect the positioning accuracy and repositioning accuracy of X axis and Z axis of the HTC20 series of NC machine tools. According to the detection result compensate NC system to meet the machining accuracy requirement. The result shows that the error compensation of NC system is a effective method to improve the position accuracy of NC machine.

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Mendonca, Sandro De Paula, Yvan Pereira Dos Santos Brito, Carlos Gustavo Resque Dos Santos, Rodrigo Do Amor Divino Lima, Tiago Davi Oliveira De Araujo e Bianchi Serique Meiguins. "Synthetic Datasets Generator for Testing Information Visualization and Machine Learning Techniques and Tools". IEEE Access 8 (2020): 82917–28. http://dx.doi.org/10.1109/access.2020.2991949.

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Gill, Navdeep, Patrick Hall, Kim Montgomery e Nicholas Schmidt. "A Responsible Machine Learning Workflow with Focus on Interpretable Models, Post-hoc Explanation, and Discrimination Testing". Information 11, n. 3 (29 febbraio 2020): 137. http://dx.doi.org/10.3390/info11030137.

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This manuscript outlines a viable approach for training and evaluating machine learning systems for high-stakes, human-centered, or regulated applications using common Python programming tools. The accuracy and intrinsic interpretability of two types of constrained models, monotonic gradient boosting machines and explainable neural networks, a deep learning architecture well-suited for structured data, are assessed on simulated data and publicly available mortgage data. For maximum transparency and the potential generation of personalized adverse action notices, the constrained models are analyzed using post-hoc explanation techniques including plots of partial dependence and individual conditional expectation and with global and local Shapley feature importance. The constrained model predictions are also tested for disparate impact and other types of discrimination using measures with long-standing legal precedents, adverse impact ratio, marginal effect, and standardized mean difference, along with straightforward group fairness measures. By combining interpretable models, post-hoc explanations, and discrimination testing with accessible software tools, this text aims to provide a template workflow for machine learning applications that require high accuracy and interpretability and that mitigate risks of discrimination.

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Hongzhou, Li, e Sun Lixia. "Design of Testing Period for Reliability Assessment of Numerical Control Machine Tools Considering Working Conditions". Mathematical Problems in Engineering 2018 (8 luglio 2018): 1–8. http://dx.doi.org/10.1155/2018/1962064.

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The existing methods of determining testing period do not consider the effect of working condition covariates on reliability testing period of Numerical Control (NC) machine tools, which may lead to high-cost testing or low-precision assessment. Aiming at the problem, a new method of determining the testing period considering working condition covariates is proposed. The change rate of interval estimation of Mean Time between Failures (MTBF) is used as the criterion for determining the length of testing period. The reliability model of NC machine tools is established by the Cox proportional hazards model, and the two-step estimation method is used to estimate parameters of the baseline failure rate function and the coefficients of working condition covariates. The Bootstrap resamples are obtained by the Bootstrap resampling method. And then the parameters of the baseline failure rate function and the coefficients of working condition covariates are estimated simultaneously by maximum likelihood method, and thus interval estimations of MTBF under each covariate are obtained. The change rate models of MTBF interval estimation under each covariate level are established by Power function, and the testing periods under each covariate are obtained. Case study indicates that the testing periods under each covariate obtained by the proposed method are more accurate than those obtained by the others, when the same criterion and confidence level 1-α are set.

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Jiang, Xiaogeng, e Robert J. Cripps. "Accuracy evaluation of rotary axes of five-axis machine tools with a single setup of a double ball bar". Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture 231, n. 3 (8 agosto 2016): 427–36. http://dx.doi.org/10.1177/0954405415617448.

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A double ball bar (DBB) is used extensively to evaluate the geometric and dynamic performance of three-axis machine tools by means of the XY, YZ and XZ planar circular tests. However, research using a DBB to test the rotary axes of five-axis machine tools simply, quickly and effectively is scarce. In this paper, a method having two steps to identify the imprecision of the rotary axes caused by the position-independent geometric errors (PIGEs) is presented for a tilting rotary type five-axis machine tool using a DBB. The first step is designed to evaluate two rotary axes with one setup. Its advantage of fast diagnosis effectively reduces the machine down time, and thus can be employed as a quick testing approach of the machine tool. However, if some of the diagnosed errors fall outside their tolerances, a more accurate but slower check needs to be carried out due to the limitation of the first step. The second step aims to test the two rotary axes separately, each in two sub-steps. By means of varying the position of the pivot, the A- and C-axes can be tested individually. Both steps are performed with only one axis moving, thus simplifying the error analysis. Implementation of the proposed methods was carried out on a Hermle C600U five-axis machine tool. To show the validity of the method, the identified PIGEs are compensated for in each step, which suggests that the first step can be used as a fast and preliminary indication of a five-axis machine tool’s performance, whilst the second can be carried out if a more thorough evaluation is needed.

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Yuqing, Zhou, Sun Bingtao, Li Fengping e Song Wenlei. "NC Machine Tools Fault Diagnosis Based on Kernel PCA andk-Nearest Neighbor Using Vibration Signals". Shock and Vibration 2015 (2015): 1–10. http://dx.doi.org/10.1155/2015/139217.

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This paper focuses on the fault diagnosis for NC machine tools and puts forward a fault diagnosis method based on kernel principal component analysis (KPCA) andk-nearest neighbor (kNN). A data-dependent KPCA based on covariance matrix of sample data is designed to overcome the subjectivity in parameter selection of kernel function and is used to transform original high-dimensional data into low-dimensional manifold feature space with the intrinsic dimensionality. ThekNN method is modified to adapt the fault diagnosis of tools that can determine thresholds of multifault classes and is applied to detect potential faults. An experimental analysis in NC milling machine tools is developed; the testing result shows that the proposed method is outperforming compared to the other two methods in tool fault diagnosis.

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Babu, Ramesh, V. Prabhu Raja, J. Kanchana e Devara Venkata Krishna. "Identification, development and testing of thermal error compensation model for a headstock assembly of CNC turning centre". International Journal of Engineering & Technology 3, n. 2 (27 marzo 2014): 113. http://dx.doi.org/10.14419/ijet.v3i2.2012.

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In CNC machine tools, transient temperature variation in the headstock assembly is the major contributors for spindle thermal error. The compensation of thermal error is critical for ensuring the accuracy of machine tool. The performance of an error compensation system depends largely on the accuracy and robustness of the thermal error model. In the present work, a robust thermal error model is developed for minimizing the error in lateral direction of the spindle which significantly influences the geometrical accuracy of the workpiece. Analysis-of-variance (ANOVA) is applied to the results of the experiments in determining the percentage contribution of each individual temperature key point against a stated level of confidence. Based on the analysis of existing approaches for thermal error modeling of machine tools, an approach of LASSO (least absolute shrinkage and selection operator) is proposed in order to avoid the multi collinearity problem. The proposed method is an innovative variable selection method to remove redundant or unimportant temperature key points in the linear thermal error model and minimize the residual sum of squares. The predictive error model is found to have better robustness and accuracy in comparison to the combination of grey correlation and step wise linear regression for error compensation of CNC lathe. Keywords: Analysis Of Variance (ANOVA), CNC Machine Tool, Grey Correlation Analysis (GCA), Headstock Assembly, LASSO Regression, Mean Absolute Deviation (MAD), Mean Square Error (MSE), Robustness, Standard Deviation (SD), Thermal Error.

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Laddada, S., T. Benkedjouh, M. O. Si- Chaib e R. DRAI. "Remaining useful life prediction of cutting tools using wavelet packet transform and extreme learning machine". Algerian Journal of Signals and Systems 3, n. 4 (15 dicembre 2018): 156–65. http://dx.doi.org/10.51485/ajss.v3i4.72.

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Online tool wear prediction is a determining factor to the success of smart manufacturing operations. The implementation of sensors based Prognostic and Health Management (PHM) system plays an important role in estimating Remaining Useful Life (RUL) of cutting tools and optimizing the usage of Computer Numerically Controlled (CNC) machines. The present paper deals with health assessment and RUL estimation of the cutting tool machines based on Wavelet Packet Transform (WPT) and Extreme Learning Machine (ELM). This approach is done in two phases: a learning (offline) phase and a testing (online) phase. During the first phase, the WPT is used to extract the relevant features of raw data computed in the form of nodes energy. The extracted features are then fed to the learning algorithm ELM in order to build an offline model. In the online phase, the constructed model is exploited for assessing and predicting the RUL of cutting tool. The main idea is that ELM involves nonlinear regression in a high dimensional feature space for mapping the input data via a nonlinear function to build a prognostics model. The method was applied to real world data gathered during several cuts of a milling CNC tool. The performance of the proposed method is evaluated through the accuracy metric. Results showed the significance performances achieved by the WPT and ELM for early detection and accurate prediction of the monitored cutting tools.

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Zou, Hua Bing, Xin Du Chen e Hong Jian Xia. "Modeling of the Positioning Error in Ultra-Precision Machine Tools". Key Engineering Materials 679 (febbraio 2016): 33–36. http://dx.doi.org/10.4028/www.scientific.net/kem.679.33.

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Abstract (sommario):

The positioning error of ultra-precision machine tools is the primary factor directly affecting the machining accuracy. It mainly depends on the machine tools guide. And its variation trend contains the same inertia as that of the machine tools movement. The variation trend of the positioning error is the derivative of a function fitted with the positioning errors of three adjacent testing points. The variation trends function is fitted with the variation trend of many points. The model of positioning error is the integral of the variation trends function. Because the variation trend of positioning error has certain inertia, the model of positioning error which is obtained in this way is more precise and more reliable than error function model which is directly fitted with limited discrete data.

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Panjaitan, Dita Trisna, Jeksen Kristian Sinaga, Nurul Qodri, Vianola Elisa Karo Sekali, Fatuan Arif Sitorus e Rita Juliani. "DESIGN OF DIGITAL SHOE BASED SHOES SKIN MODELING AND CUTTING MACHINE". Jurnal Geliga Sains: Jurnal Pendidikan Fisika 7, n. 1 (24 luglio 2019): 40. http://dx.doi.org/10.31258/jgs.7.1.40-45.

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Bunut is one of regions in Kisaran. The majority of Asahan District work as shoe craftsmen. The length time ofshoes making procces make the shoe craftsmen need long time to market it. Similarly when designing shoe modelthat still us traditional tools that make shoe’s model impressed outdated. In terms of making Bunut shoe is noteasy. Cutting leather shoe that use traditional tools make the cutting process of the shoe becomes long. Themethod is started from designing a modeling tool, preparing tools and material, making and testing machines.The result obtained by this shoe modeling machine work optimally 8 hours per day with the cutting velocity 1,4minutes for each shoe's pattern, from the result modelling machine able to cut design pattern a pair of shoes in40 minutes. So in one day it can produce shoe pattern pieces is able to produce 12 pairs of shoe patterns from theprevious one, only 2 pairs per day.

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Kawai, Nozomu, e Kuniaki Dohda. "A New Lubricity Evaluation Method for Metal Forming by a Compression-Twist Type Friction Testing Machine". Journal of Tribology 109, n. 2 (1 aprile 1987): 343–50. http://dx.doi.org/10.1115/1.3261364.

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A new compression-twist type friction testing machine has been developed to simulate the frictional conditions prevailing in metal forming. Twin indenter tools with different sliding length were used and mineral oils were tested under frictional sliding between mild steel and a tool steel. New indexes of boundary lubricity, oil-film strength, and anti-galling ability are proposed to evaluate lubricant performance.

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Senko, Anna N., e Olga S. Bliznyuk. "Factors and Tools for Managing the Competitiveness of the Machine-Building Complex". Economic Strategies 144, n. 4 (20 agosto 2021): 126–35. http://dx.doi.org/10.33917/es-4.178.2021.126-135.

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The article defines the main factors of increasing the competitiveness of the machine-building complex in the integration economic area. The relationship between the factors of comparative competitive advantages of export-oriented engineering production and the structure of commodity exports is presented in the article. A methodology for assessing the competitiveness of the machine-building complex is proposed, which is focused on determining its comparative advantages in prospective segments of export commodity groups. The results of testing the methodology on the basis of statistical data of export segments of the commodity groups of machine-building industry in the CIS countries are presented.

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Hồ Dương, Đông. "Testing drilling tool intergrating damping system using machining test method". Journal of Science and Technology Issue on Information and Communications Technology 17, n. 6 (30 giugno 2019): 56. http://dx.doi.org/10.31130/jst-ud2018-346e.

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In this paper, machining test in lathe machine is used to check the characteristics of damped drilling tool and damped clamp tool. The testing results are then compared with those of conventional drilling tool and clamp to see the differences. The damped tool achieves better quality surface while mounting in the conventional clamp. The damped clamp helps the conventional tool improve the damping ratio significantly, however, it does not give any improvement for the damped tool. Taguchi method is conducted to find the optimal cutting parameters for each combination of drilling tools and clamping devices. This paper follows the results of the published article on The Journal of Science and Technology – The University of Danang December 2017, named “Research on characteristics of drilling tool intergrating damping system using Experimental Model Analysis”.

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Almadani, M. Ikhsan, e Rudi Siswanto. "PROSES MANUFAKTUR MESIN POLES DAN AMPELAS UNTUK PROSES METALOGRAFI". JTAM ROTARY 2, n. 1 (20 aprile 2020): 15. http://dx.doi.org/10.20527/jtam_rotary.v2i1.2001.

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Abstract (sommario):

Mesin poles dan amplas adalah salah satu alat yang bekerja menggunakan energi listrik. Sifat mekanik suatu logam atau paduan dapat diamati, salah satunya adalah dengan menganalisis struktur mikro material. Pengujian metalografi dilakukan untuk mengamati struktur mikro. Dalam proses pengerjaan sampel pengujian metalografi selalu melibatkan mesin poles dan amplas. Perumusan masalah dalam pembuatan mesin poles dan amplas ini adalah “Bagaimana proses pembuatan mesin poles dan amplas dan berapa biaya pembuatan mesin poles dan mesin abrasif”. Komponen pada mesin adalah rangka, motor, bantalan, katrol, cakram yang dipoles, reservoir, pompa air, dan keran air, sedangkan alat dan mesin yang digunakan dalam proses pembuatan adalah alat las listrik, penggiling listrik, penggiling duduk, mesin bor tangan, mesin bor duduk, tuas potong, tang sungai, pengelasan asetilena dan mesin bubut. The polishing and sandpaper machine is one of the tools that works using electrical energy. The mechanical properties of a metal or alloy can be observed, one of which is by analyzing the microstructure of the material. Metallographic testing is carried out aimed at observing the microstructure. in the process of working on metallographic testing samples involving a polishing machine and sandpaper. The formulation of the problem in making this polishing machines and sandpaper is “What is the process of manufacturing polishing machines and sandpaper and how much is the cost of manufacturing polishing and abrasive machines”. Components on the engine are frame, motor, bearing, pulleys, polished discs, reservoirs, water pumps, and water taps, while the tools and machines used in the manufacturing process are electric welding tools, electric grinders, sitting grinders, hand drill machines, sitting drill machines, cut levers, riverter pliers, acetylene welding and lathes.

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Szuster, Marcin, e Bartłomiej Kozioł. "Hidden Security Breaches in Automatic Control of Technological Processes". Pomiary Automatyka Robotyka 25, n. 2 (30 giugno 2021): 31–39. http://dx.doi.org/10.14313/par_240/31.

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Abstract (sommario):

The progressing automation and robotization in the industrial plants as well as the increasing complexity of the control systems of integrated machines make it necessary to constantly improve the functional safety of machines through the correct validation of safety systems. Despite the validation process carried out, the potential software errors may reveal during the usage of the machine as hidden security breaches. The article presents examples of security breaches of real machine tools and attempts to implement solutions of automated mechanisms for detecting security problems. Another aspect of the article is the new approach for detecting hidden security breaches. Using the „digital twin” model of the machine, a program that generates a sequence of events for testing control systems, and the use of a virtual reality (visual verification of the safety programs), it is possible to maximize the functional safety functions of the machine.

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STRYCZEK, Roman, e Wojciech SZCZEPKA. "SIMULATION TESTS OF ADAPTIVE CONTROL STRATEGIES FOR CNC MACHINE TOOLS". Journal of Machine Engineering 19, n. 2 (9 giugno 2019): 73–82. http://dx.doi.org/10.5604/01.3001.0013.2225.

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The issue addressed in the article concerns the current needs and possibilities of computer-aided design of adaptive control strategies in machining processes. A simulative method of selecting the adaptive feed control strategy while rough turning materials difficult to machine, effective and inexpensive in its implementation, based on controlling the load placed on the machine's drives, has been presented. The results of a number of virtual tests of the proposed feed control strategy have been included, while paying particular attention to the stability of the machining process during moments of sudden change in the machining allowance. The obtained results meet the accepted quality indicators of the control algorithm. At the same time, the experiences collected by the author while conducting the tests confirmed the complexity of the issue and the resulting necessity to implement a comprehensive simulation testing program.

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