Relevant bibliographies by topics / Test workpiece

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers

Academic literature on the topic 'Test workpiece'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Test workpiece"

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Wang, Xiaomin, Zexiao Xie, Kun Wang, and Liqin Zhou. "Research on a Handheld 3D Laser Scanning System for Measuring Large-Sized Objects." Sensors 18, no. 10 (October 21, 2018): 3567. http://dx.doi.org/10.3390/s18103567.

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A handheld 3D laser scanning system is proposed for measuring large-sized objects on site. This system is mainly composed of two CCD cameras and a line laser projector, in which the two CCD cameras constitute a binocular stereo vision system to locate the scanner’s position in the fixed workpiece coordinate system online, meanwhile the left CCD camera and the laser line projector constitute a structured light system to get the laser lines modulated by the workpiece features. The marked points and laser line are both obtained in the coordinate system of the left camera in each moment. To get the workpiece outline, the handheld scanner’s position is evaluated online by matching up the marked points got by the binocular stereo vision system and those in the workpiece coordinate system measured by a TRITOP system beforehand; then the laser line with workpiece’s features got at this moment is transformed into the fixed workpiece coordinate system. Finally, the 3D information composed by the laser lines can be reconstructed in the workpiece coordinate system. A ball arm with two standard balls, which is placed on a glass plate with many marked points randomly stuck on, is measured to test the system accuracy. The distance errors between the two balls are within ±0.05 mm, the radius errors of the two balls are all within ±0.04 mm, the distance errors from the scatter points to the fitted sphere are distributed evenly, within ±0.25 mm, without accumulated errors. Measurement results of two typical workpieces show that the system can measure large-sized objects completely with acceptable accuracy and have the advantage of avoiding some deficiencies, such as sheltering and limited measuring range.
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Slătineanu, Laurenţiu, Margareta Coteaţă, Irina Besliu, Lorelei Gherman, and Oana Dodun. "Machining of External Cylindrical Surfaces on a RAM Electrical Discharge Machine." Key Engineering Materials 554-557 (June 2013): 1800–1805. http://dx.doi.org/10.4028/www.scientific.net/kem.554-557.1800.

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As other nonconventional machining methods, the electrical discharge machining is applied when the workpieces materials are difficult to be machined by classical machining methods or the surfaces could not be obtained in efficient conditions by classical machining methods. Such a situation could appear, for example, when test pieces must be separated from materials whose machining by classical methods is difficult. Taking into consideration the necessity to detach a cylindrical test piece from a workpiece made of a high resistance metallic alloy, the problem of using the electrical discharge machining was formulated. An initial experimental test by using the common work motion of the tool electrode from up to down highlighted high shape errors, due to the accumulation in the work zone of the particles detached from the workpiece and from the tool electrode, as a consequence of electrical discharge machining process. A second set of experiments were developed, placing the test piece over the electrode tool and ensuring a work motion of workpiece from up to down; in this situation, a diminishing of the shape error was noticed. The second set of experiments highlighted a relatively reduced conicalness of the machined surface and a low decrease of the machining speed. as the penetration depth of the tool electrode in the workpiece increases, too.
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Holub, Michal, Robert Jankovych, Jan Vetiska, Jan Sramek, Petr Blecha, Jan Smolik, and Petr Heinrich. "Experimental Study of the Volumetric Error Effect on the Resulting Working Accuracy—Roundness." Applied Sciences 10, no. 18 (September 8, 2020): 6233. http://dx.doi.org/10.3390/app10186233.

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Currently, various types of software compensations are applied to machine tools. Their aim is to increase the working accuracy of the tools. The improvement in working accuracy is then further assessed according to the increase in the dimensional and shape accuracy or the surface quality of the workpiece. This publication describes the effects of the volumetric accuracy of a machine tool on the working accuracy of a workpiece, where total roundness (RONt) is evaluated in multiple cuts. In the experiment, two test workpieces are manufactured on a three-axis milling machining centre. The first is made using a standard machine setup while the second with activated volumetric compensation. The LaserTRACER self-tracking laser interferometer is used to compensate for volumetric accuracy. In the second part, verification measurements are performed with a Ballbar, where roundness error is evaluated according to ISO 230-4. Then two test workpieces are machined, and, in the last part, measurement is performed on Talyrond 595S roundness measuring equipment. Finally, the results are analysed and the dependence between the volumetric accuracy, the circularity error of the machine and the working accuracy of the CNC machine tool is established, represented by the RONt of the workpiece. This paper presents new and unpublished relations between the volumetric accuracy of the machine tool and the RONt of the workpiece.
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Kang, Yong Gang, Zhong Qi Wang, J. J. Wu, and Cheng Yu Jiang. "Efficient Algorithms for Calculations of the Maximum Surface Form Errors in Peripheral Milling." Applied Mechanics and Materials 10-12 (December 2007): 757–61. http://dx.doi.org/10.4028/www.scientific.net/amm.10-12.757.

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An efficient flexible iterative algorithm with a general approach is presented for calculations of surface form errors in peripheral milling of thin-walled workpiece. An efficient finite-element model for tool/workpiece is presented to analyze the surface dimensional errors in peripheral milling of aerospace thin-walled workpieces. The efficient flexible iterative algorithm is proposed to calculate the deflections and the maximum surface form errors as contrasted with the rigid iterative algorithm used in the literatures. Meanwhile, some key techniques such as the finite-element modeling of the tool-workpiece system; the determinant algorithm to judge instantaneous immersion boundaries between a cutter element and the workpiece; iterative scheme for the calculations of tool-workpiece deflections considering the former convergence cutting position are developed and the method for calculating the position and magnitude of the maximum surface form errors are developed and presented in detail. The proposed approach is validated and proved to be efficient through comparing the obtained numerical results with the test results.
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Qu, Li Gang, Guo Tao Chen, Chang Qing Su, and Yu Juan Xin. "A Test to Measure the Rate of Adsorption Deformation of Flexible Assembly Tooling." Applied Mechanics and Materials 709 (December 2014): 451–55. http://dx.doi.org/10.4028/www.scientific.net/amm.709.451.

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Traditional tooling for aircraft skin will produce a large clamping deformation of the inadequacies in the assembly process, designed a vacuum suction cup flexible assembly tooling, that tooling using vacuum suction force to clamp the workpiece in the assembly process, greatly reduces the amount of deformation of the workpiece. In order to accurately grasp the new tooling excellent performance in terms of adsorption deformation, through the establishment of a laser measuring device test platform, we conducted a large number of studies of vacuum adsorption deformation experiment on different thickness of the workpiece,has been obtained the workpiece adsorption deformation rate range under the flexible tooling system, as well workpiece thickness, sucker adsorption, the number of anchor effect on the adsorption deformation rate of the workpiece, and verify the reasonableness of the flexible assembly tooling.
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Umezu, Takuma, and Daisuke Kono. "Machining Process for a Thin-Walled Workpiece Using On-Machine Measurement of the Workpiece Compliance." International Journal of Automation Technology 13, no. 5 (September 5, 2019): 631–38. http://dx.doi.org/10.20965/ijat.2019.p0631.

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Demand for highly productive machining of thin-walled workpieces has been growing in the aerospace industry. Workpiece vibration is a critical issue that could limit the productivity of such machining processes. This study proposes a machining process for thin-walled workpieces that aims to reduce the workpiece vibration during the machining process. The workpiece compliance is measured using an on-machine measurement system to obtain the cutting conditions and utilize the same for suppressing the vibration. The on-machine measurement system consists of a shaker with a force sensor attached on the machine tool spindle, and an excitation control system which is incorporated within the machine tool’s numerical control (NC). A separate sensor to obtain the workpiece displacement is not required for the estimation of the displacement. The system is also capable of automatic measurement at various measurement points because the NC controls the positioning and the preloading of the shaker. The amplitude of the workpiece vibration is simulated using the measured compliance to obtain the cutting conditions for suppressing the vibration. An end milling experiment was conducted to verify the validity of the proposed process. The simulations with the compliance measurement using the developed system were compared to the results of a conventional impact test. The comparison showed that the spindle rotation speed for suppressing the vibration could be successfully determined; but, the axial depth of cut was difficult to be determined because the simulated vibration amplitude was larger than that found in the experimental result. However, this can be achieved if the amplitude is calibrated by one machining trial.
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Henerichs, Marcel, Michael Egeter, Thomas Liebrich, Robert Voß, and Konrad Wegener. "Evaluation of the IWF-Wunder Reproduction Method for Generating Positive Replica." International Journal of Automation Technology 8, no. 1 (January 5, 2014): 49–56. http://dx.doi.org/10.20965/ijat.2014.p0049.

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Research into manufacturing technology requires regular measurement and documentation of workpiece and tool quality. The instant or direct measurement of tool or workpiece surfaces is often difficult or impossible. Remounting of workpieces or tools leads to undesired remounting errors, a direct integration of adapted measurement systems is not suitable for research and development. Additionally, abrasive or transparent surfaces can be unsuitable for use with some measurement systems. This study evaluates an imprinting method for the production of positive replicas of tool or workpiece surfaces. The resulting errors between original sample and replica are evaluated. The analyses include common test methods, such as tactile surface profiling, focus variation microscopy, and white light interferometry. The study shows that for the evaluated reproduction method, the difference between original and replica is less than 10%of the surface roughness, Ra, for original surface roughnesses greater than Ra= 0.1µm. Mostly better results are achieved (difference <2%). In addition, contour dimensions greater 1 mm can be copied with deviations less than 0.5%.
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Matsumoto, Ryo, Hiroshi Utsunomiya, and Shinya Ishigai. "Lubrication in Hot Forging with Pulsed Ram Motion." Key Engineering Materials 767 (April 2018): 149–56. http://dx.doi.org/10.4028/www.scientific.net/kem.767.149.

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The effect of pulsed (oscillating) ram motion control on lubrication was investigated in hot forging of stainless steel workpiece with oxide glass lubricant. During the retreat in the pulsed ram motion, the workpiece was re-lubricated by flow of lubricant through the gap between the workpiece and the die. A hot spike-type forging test on a servo press with pulsed ram motions was carried out to investigate the lubrication performance of the oxide glass. In the test, the workpiece with a temperature of 1223 K was extruded into the hollow part of the upper die together with oxide glass in a manner that combined pulsed and stepwise ram operations. The re-lubrication of the workpiece with oxide glass was confirmed by the test results showing 5–10% reduction in the forging load and 5% longer length of the backward extruded part of the workpiece under an appropriate pulsed ram motion.
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Kang, Yong Gang, and Zhong Qi Wang. "The Flexible Iterative Algorithm for Calculations of Static Form Errors in Peripheral Milling Thin-Walled Components." Advanced Materials Research 102-104 (March 2010): 455–59. http://dx.doi.org/10.4028/www.scientific.net/amr.102-104.455.

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This paper proposes a new efficient iterative algorithm which named flexible iterative algorithm (FIAL) with a general approach suitable for surface form errors prediction in peripheral milling of thin-walled workpiece. First, a FEA-Based model is presented to analyze the surface dimensional errors in peripheral milling of thin-walled workpieces. Then the FIAL is discussed in detail for the procedure of deformation prediction. From FIAL, an iterative scheme for the calculations of tool/workpiece deflections considering the former convergence cutting position are developed，in the scheme a small variable must be included in the calculation of radial cutting depth which never been considered in the literatures before.The proposed approach is validated and proved to be efficient through comparing the obtained numerical results with the test results.
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Gao, Siyang, Bangcheng Zhang, and Jianwei Sun. "Research on the Design Method of a Bionic Suspension Workpiece Based on the Wing Structure of an Albatross." Applied Bionics and Biomechanics 2019 (February 3, 2019): 1–11. http://dx.doi.org/10.1155/2019/2539410.

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An air suspension platform uses air pressure to realize the suspension function during the suspension process, and it has the disadvantage of large air pressure and a small suspension force. In this study, an air suspension platform was built using bionic design to reduce the required air pressure and increase the suspension force. A suspension structure mapping model was established according to the physiological structure characteristics of albatross wings. A bionic model was established by using the theoretical calculation formula and structural size parameters of the structural design. A 3D printer was used to manufacture the physical prototype of the suspended workpiece. Based on this, a suspension test rig was built. Six sets of contrast experiments were designed. The experimental results of the suspension test bench were compared with the theoretical calculation results. The results show that the buoyancy of the suspended workpiece with a V-shaped surface at a 15-degree attack angle was optimal for the same air pressure as the other workpieces. The surface structure of the suspended workpiece was applied to the air static pressure guide rail. By comparing the experimental data, the air pressure of the original air suspension guide rail was reduced by 37%, and the validity of the theory and design method was verified.
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Dissertations / Theses on the topic "Test workpiece"

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Cabalka, Jan. "Metoda určování přesnosti obráběcích robotů." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-232078.

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This thesis describes the design of methodology for measuring the accuracy of robot machining. It describes the theoretical properties and classification of commercially available methods for precision measurement. In the practical part, a test workpiece is manufactured and positions and toolpaths are measured by the Pontos system. The proposals are based on the MCAE Systems company's equipment.
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Books on the topic "Test workpiece"

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Zinn, S., and S. L. Semiatin. Elements of Induction Heating. ASM International, 1988. http://dx.doi.org/10.31399/asm.tb.eihdca.9781627083416.

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Elements of Induction Heating: Design, Control, and Applications discusses the principles of electromagnetic induction and the setup and use of induction heating processes and equipment. The first few chapters cover the theory of induction heating and the factors that must be considered when selecting and configuring components for a given application. As the text explains, the frequency required for efficient heating is determined by the geometry of the coil, the properties, size, and shape of the workpiece, and the need to maintain adequate skin effect. It also depends on proper tuning and load matching, which is explained as well. Subsequent chapters discuss the use of external cooling, temperature sensing, and power-timing devices, the fundamentals of process control, the role of flux concentrators, shields, and susceptors, and the integration of material handling equipment. The book also covers coil design and fabrication and explains how induction heating systems can be tailored for specific applications such as billet and bar heating, surface hardening, pipe welding, tin reflow, powder metal sintering, and brazing, and for curing adhesives and coatings. For information on the print version, ISBN 978-0-87170-308-8, follow this link.
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Book chapters on the topic "Test workpiece"

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Pieśko, Paweł, and Magdalena Zawada-Michałowska. "Assessment of Machining Accuracy of a WaterJet Cutter by Test Workpiece Machining." In Lecture Notes in Mechanical Engineering, 243–52. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-18789-7_21.

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Ben Abdelali, Hamdi, Wacef Ben Salem, Joel Rech, Abdelwaheb Dogui, and Philippe Kapsa. "Characterization of the Friction Coefficient and White Layer at the Tool-Chip-Workpiece Interface Using Experimental and Numerical Studies during Friction Tests of AISI 1045." In Lecture Notes in Mechanical Engineering, 541–48. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-37143-1_65.

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Shizong, Chen, and Chen Gouyu. "Control of Harmful Impurities in Test Agents Applied on Workpiece Surfaces." In Non-destructive Testing '92, 527–29. Elsevier, 1992. http://dx.doi.org/10.1016/b978-0-444-89791-6.50113-x.

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"Comparative Study on Tribological Properties of Nanofluids in Friction-Wear Experiments and Grinding Processing." In Enhanced Heat Transfer Mechanism of Nanofluid MQL Cooling Grinding, 298–316. IGI Global, 2020. http://dx.doi.org/10.4018/978-1-7998-1546-4.ch013.

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This chapter presents the lubricating properties of different vegetable-oil-based nanofluids through a comparative evaluation between frictional test and grinding experiment. The first experiment aimed to prejudge the lubricating properties of different nanofluids with a frictional test, which simulated the interface state of grinding between the abrasive grains and the workpiece. The second aimed to test and verify the lubricating properties of the same nanofluids through a grinding experiment. The mechanism of oil-film formation of nanofluids in the grinding zone was analyzed by morphology and element analysis of the worn surface. The experimental results show that Al2O3 nanofluids have the best tribological properties. Compared with pure base oil, the friction coefficient is reduced by 20%, and the optimal friction surface morphology is obtained. The good anti-friction and anti-wear properties of nanofluids are attributed to the formation of the protective oil film formed by chemical reaction on the surface.
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Kobayashi, Shiro, Soo-Ik Oh, and Taylan Altan. "Axisymmetric Isothermal Forging." In Metal Forming and the Finite-Element Method. Oxford University Press, 1989. http://dx.doi.org/10.1093/oso/9780195044027.003.0012.

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According to Spies, the majority of forgings can be classified into three main groups. The first group consists of compact shapes that have approximately the same dimensions in all three directions. The second group consists of disk shapes that have two of the three dimensions (length and width) approximately equal and larger than the height. The third group consists of the long shapes that have one main dimension significantly larger than the two others. All axially symmetric forgings belong to the second group, which includes approximately 30% of all commonly used forgings. A basic axisymmetric forging process is compression of cylinders. It is a relatively simple operation and thus it is often used as a property test and as a preforming operation in hot and cold forging. The apparent simplicity, however, turns into a complex deformation when friction is present at the die–workpiece interface. With the finite-element method, this complex deformation mode can be examined in detail. In this chapter, compression of cylinders and related forming operations are discussed. Since friction at the tool–workpiece interface is an important factor in the analysis of metal-forming processes, this aspect is also given particular consideration. Further, applications of the FEM method for complex-shaped dies are shown in the examples of forging and cabbaging. Finite-element discretization with a quadrilateral element is similar to that given in Chap. 8. The cylindrical coordinate system (r, ϑ, z) is used instead of the rectangular coordinate system. The element is a ring element with a quadrilateral cross-section, as shown in Fig. 9.1. The ξ and η of the natural coordinate system vary from −1 to 1 within each element.
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Pai, Srinivasa P., and Nagabhushana T. N. "Tool Condition Monitoring Using Artificial Neural Network Models." In Handbook of Research on Emerging Trends and Applications of Machine Learning, 550–76. IGI Global, 2020. http://dx.doi.org/10.4018/978-1-5225-9643-1.ch026.

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Tool wear is a major factor that affects the productivity of any machining operation and needs to be controlled for achieving automation. It affects the surface finish, tolerances, dimensions of the workpiece, increases machine down time, and sometimes performance of machine tool and personnel are affected. This chapter deals with the application of artificial neural network (ANN) models for tool condition monitoring (TCM) in milling operations. The data required for training and testing the models studied and developed are from live experiments conducted in a machine shop on a widely used steel, medium carbon steel (En 8) using uncoated carbide inserts. Acoustic emission data and surface roughness data has been used in model development. The goal is for developing an optimal ANN model, in terms of compact architecture, least training time, and its ability to generalize well on unseen (test) data. Growing cell structures (GCS) network has been found to achieve these requirements.
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Pai, Srinivasa P., and Nagabhushana T. N. "Tool Condition Monitoring Using Artificial Neural Network Models." In Research Anthology on Artificial Neural Network Applications, 400–426. IGI Global, 2022. http://dx.doi.org/10.4018/978-1-6684-2408-7.ch019.

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Tool wear is a major factor that affects the productivity of any machining operation and needs to be controlled for achieving automation. It affects the surface finish, tolerances, dimensions of the workpiece, increases machine down time, and sometimes performance of machine tool and personnel are affected. This chapter deals with the application of artificial neural network (ANN) models for tool condition monitoring (TCM) in milling operations. The data required for training and testing the models studied and developed are from live experiments conducted in a machine shop on a widely used steel, medium carbon steel (En 8) using uncoated carbide inserts. Acoustic emission data and surface roughness data has been used in model development. The goal is for developing an optimal ANN model, in terms of compact architecture, least training time, and its ability to generalize well on unseen (test) data. Growing cell structures (GCS) network has been found to achieve these requirements.
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Palanikumar, K., B. Latha, and J. Paulo Davim. "Application of Taguchi Method with Grey Fuzzy Logic for the Optimization of Machining Parameters in Machining Composites." In Computational Methods for Optimizing Manufacturing Technology, 219–41. IGI Global, 2012. http://dx.doi.org/10.4018/978-1-4666-0128-4.ch009.

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Glass fiber reinforced plastic (GFRP) composite materials are continuously displacing the traditional engineering materials and are finding increased applications in many fields, such as automobile, marine, sport goods, et cetera. Machining of these materials is needed to achieve near-net shape. In machining of composite materials, optimization of process parameters is an important concern. This chapter discusses the use of Taguchi method with Grey-fuzzy logic for the optimization of multiple performance characteristics considering material removal rate, surface roughness, and specific cutting pressure. Experiments were planned using Taguchi’s orthogonal array with the cutting conditions prefixed. The cutting parameters considered are workpiece (fiber orientation), cutting speed, feed, depth of cut, and machining time. The machining tests were performed on a lathe using coated cermet cutting tool. The results indicated that the optimization technique is greatly helpful in achieving better surface roughness and tool wear simultaneously in machining of GFRP composites.
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"predicting the permissible external loading that a diamond-coated cutting tool can withstand without premature de-bonding. 3.1.6. Wear mechanisms. The failure of CVD diamond-coated inserts during machining can be in the form of flaking (interfacial failure) or abrasive wear (gradual cohesive failure) [22]. Ideally, a test of superb adhesion is when the diamond coating fully deteriorates by wear rather than flaking. Flaking will occur primarily due to poor adhesion between the diamond coating and the carbide substrate [6]. Therefore, flaking is clearly undesirable because the benefit of using a diamond coating is lost, except for the chip breaking assistance of faceted diamond crystals at the rake surface [29, 75]. If the adhesion strength of the CVD diamond coating is sufficient to withstand the machining stresses, then the abrasive action between the workpiece material and the diamond coating becomes the primary failure mechanism. Unless the CVD diamond coating is polished, a two-step wear mechanism is ex­ pected to occur. The first step is caused by the initial high surface roughness of the CVD diamond coating in which crack initiation occurs at the surface. The mecha­ nism that describes such behavior was proposed by Gunnars and Alahelisten [56]. They described a three-zone wear model as shown in Fig. 6. In this model, the role of residual stresses becomes significant in controlling crack propagation from the surface to the interface that could lead to interface failure (flaking). As outlined earlier, the high total compressive residual stress present in CVD diamond coatings on carbide inserts was assumed to be biaxial and oriented parallel to the interface. Wear starts to occur at the surface, which, because of geometry, allows stress to relax. A crack is more likely to initiate at protruding grains in zone I and propa­ gate preferentially along the (111) easy cleavage planes of diamond. The geometry at deeper depths, however, prevents the compressive residual stress from relaxing. Therefore, as the crack propagates deeper in the coating, it encounters higher com­ pressive stresses that cause the cracks to redirect their paths deviating from cleavage planes to a direction parallel to the interface in region II. The high compressive stress now causes cracks to propagate fast parallel to the interface resulting in a smooth surface in region III. Due to the smoother surface, fewer asperities will be present and it becomes harder to nucleate cracks." In Adhesion Aspects of Thin Films, Volume 1, 100–139. CRC Press, 2014. http://dx.doi.org/10.1201/b11971-20.

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Conference papers on the topic "Test workpiece"

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Furusawa, Masataka, and Daisuke Kono. "On-Machine Measuring Instrument of Workpiece Compliance Using Laser Interferometer." In 2020 International Symposium on Flexible Automation. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/isfa2020-9606.

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Abstract Workpiece vibration is a crucial issue in machining of thin-walled workpieces because of their large compliance. The workpiece compliance should be considered in setting machining conditions to suppress the vibration. However, the conventional impact test is laborious, and its result depends on the operator’s skill. In this study, an on-machine measurement instrument was developed to measure the compliance of thin-walled workpieces. The developed measuring instrument can be attached to the machine tool spindle for automatic compliance measurement. The workpiece compliance measured by a swept sine excitation using the developed instrument was comparable to the compliance by the conventional impact test.
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Yang, Jiandong, Chunlin Tian, Qun Liu, Haiyang Yang, and Ziqiang Hao. "Measurement of paraboloid surface workpiece with zero error sum." In 3rd International Symposium on Advanced Optical Manufacturing and testing technologies: Optical test and Measurement Technology and Equipment, edited by Junhua Pan, James C. Wyant, and Hexin Wang. SPIE, 2007. http://dx.doi.org/10.1117/12.783547.

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Zhang, Yuntao, Xiaorong Chen, and Yin Yi. "Research on the Detection Algorithm of Workpiece Surface Defects Based on Machine Vision." In 2015 International Conference on Test, Measurement and Computational Methods. Paris, France: Atlantis Press, 2015. http://dx.doi.org/10.2991/tmcm-15.2015.11.

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Qin, Feng, Kevin Chou, Dustin Nolen, and Raymond Thompson. "Chip Clogging in Dry Drilling: Workpiece Temperature Effects." In ASME/STLE 2009 International Joint Tribology Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/ijtc2009-15071.

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This study investigates the chip clogging phenomenon which occurs in dry drilling of aluminum alloys and composites, and yet, is seemingly critical to the drill life. This issue must be resolved in order to facilitate dry drilling. A highspeed dry drilling test using common twist drills was conducted with the workpiece temperature pre-heated to a wide range, room to 265 °C. The drills after testing were then examined in terms of aluminum residue that strongly adheres with the flute surfaces. A possible transition temperature range that may result in severe aluminum build-up and chip clogging was identified under the tested condition.
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Liu, Chunqing, J. Hong, and Shaofeng Wang. "Multi-Point Positioning Method for Flexible Tooling System in Aircraft Manufacturing." In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-86820.

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In the field of aircraft manufacturing, the conventional six-point location principle and relevant process equipment and technology can hardly meet the requirements of high efficient and high precision machining of large-scale thin-walled workpieces. To solve positioning problems of aircraft large-scale thin-walled workpieces in its machining and assembly process, a flexible positioning tooling system is appeared and based on which the multi-point positioning method is developed to optimize the number, location and clamping force of the vacuum heads of flexible tooling system. By numerical simulation, an example is presented to verify the effectiveness of the positioning optimization method. Finally, numbers of experiments for thin-walled workpieces were carried out to validate the positioning optimization method and the numerical example. Test data show that the FEA method used in this paper can accurately reflect the deformation of the workpiece, and the deformation of the workpiece after positioning is minimized and the stiffness is maximized with the positioning optimization method when using flexible positioning tooling system.
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Deng, L., M. Oldenburg, S. Mozgovoy, J. Hardell, and B. Prakash. "Wear Observations on Uncoated Tool and Workpiece Surfaces from a Full-Scale Press Hardening Wear Test." In The 3rd International Conference on Advanced High Strength Steel and Press Hardening (ICHSU2016). WORLD SCIENTIFIC, 2017. http://dx.doi.org/10.1142/9789813207301_0059.

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Byun, Jeongmin, and C. R. Liu. "Selection of Major Locating Surface for Improving Chucking Accuracy." In ASME 2009 International Manufacturing Science and Engineering Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/msec2009-84315.

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Two different types of surfaces are available as a major locating surface for the chucking of a cylindrical workpiece in turning operation — a flat surface and a cylindrical surface. No systematic study on the selection of a major locating surface has been reported while an appropriate selection considering the geometry of jaws and workpieces results in the significant improvement in the positioning accuracy and repeatability of a range of chucked workpieces. This research covers the most common clamping situation where a cylindrical workpiece is overhung clamped and machined with more than one set-up for finishing. In general, a workpiece with a lower length to diameter ratio should be clamped using an end face as a major locator while using a cylindrical surface can produce better positioning accuracy and repeatability for workpieces with higher length to diameter ratio. Recent studies have demonstrated the benefits of hard turning over abrasive machining processes in terms of surface integrity. A strong need currently exists for improving chucking accuracy since it work a major bottleneck in the implement finish hard turning for the production of precision, load-carrying mechanical components, such as bearings and shafts. This paper presents part of a systematic study on improving chucking accuracy for the implementation of finish hard turning, focusing on the development of criteria on the selection of a major locating surface. First, an analysis on the factors affecting the positioning accuracy for each locating surface is carried out. Then the criteria and guidelines for the selection of a major locating surface were constructed. Finally, systematic experiments were carried out to test the criteria and guidelines. The results showed that the positioning accuracy of the chucked workpieces improved significantly when following the guidelines developed in this study.
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8

Lu, Kaibo, Yiliang Wang, Hunju Liu, Zisheng Lian, and Zhaojian Yang. "A Predictive Model for Determining the Location of Chatter Onset in Turning a Slender Workpiece." In ASME 2015 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/imece2015-50575.

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Chatter is often encountered in machining processes, which reduces the geometric accuracies and dynamic stability of the cutting system. This study was motivated by the fact that chatter arising is generally related to the cutting position during straight turning of slender workpieces, which has seldom been investigated systematically in literature. In this paper, we present a predictive chatter model of turning a tailstock supported slender workpiece including the effect of the cutting tool movement along the longitudinal axis of the workpiece during cutting. Based on linear stability analysis and stiffness distribution at different cutting positions along the workpiece, an entire stability chart for a single cutting pass is constructed. By using this stability chart the critical cutting condition and the chatter onset location can be determined, and the inference of chatter lasting effect that when chatter occurs at some cutting location it will continue for a period of time until another specified location is reached, can also be drawn. Experimental trials were conducted to test the chatter model. The experimental observation was in good agreement with the theoretical inference. The difference between the predicted tool locations and the experimental results was within 9 percent at high speed cutting.
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9

Mori, Kotaro, Iwao Yamaji, Daisuke Kono, Atsushi Matsubara, Takehiro Ishida, Yuki Kaitani, Eiji Higashi, and Taisuke Urakami. "Influence of Contact Positioning of Pivot Support on Machining Vibration." In ASME 2021 16th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/msec2021-63302.

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Abstract The authors have studied support mechanisms for the machining of thin-walled workpieces. Previous studies have shown that the newly proposed pivot support has a vibration suppression effect on flat plate workpieces. This report clarifies the guideline for determining the placement interval for deploying this support on a cylindrical workpiece. Also, a machining test was conducted to compare the damping effect of pivot support with that of conventional rigid body support. As a result, it was found that the pivot support has an equivalent vibration suppression effect as the conventional support has. By using the proposed support, installation can be simplified while maintaining the damping effect.
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Miklos, Akos, Denes Takacs, Richard Wohlfart, Gabor Porempovics, Tamas G. Molnar, Daniel Bachrathy, Andras Toth, and Gabor Stepan. "The Development of High Speed Virtual Milling Test." In ASME 2017 Dynamic Systems and Control Conference. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/dscc2017-5217.

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The concept of a hardware-in-the-loop experiment for high speed milling is introduced in this paper. The tool-workpiece interaction is virtually implemented in the experiment while the milling machine with the spindle is used as real element. In this paper, the basic components of the experiment are presented, namely, a contactless displacement sensor, a computational algorithm of the cutting force and a contactless electromagnetic actuator are discussed. Experiments on the prototype of the electromagnetic actuator are also shown to illustrate the potential of the concept. A feasibility study of the hardware-in-the-loop experiment is given, where the effect of the time delay included in the experiment is investigated.
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