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Journal articles on the topic 'Hydraulic presses Modularity (Engineering)'

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Published: 4 June 2021
Last updated: 1 February 2022

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1

Artemov, B. S. "Hydraulic sealing device for hydraulic corrugating presses." Chemical and Petroleum Engineering 22, no. 2 (February 1986): 68. http://dx.doi.org/10.1007/bf01148285.

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2

Siegert, K., and E. Doege. "CNC Hydraulic Multipoint Blankholder System for Sheet Metal Forming Presses." CIRP Annals 42, no. 1 (1993): 319–22. http://dx.doi.org/10.1016/s0007-8506(07)62452-4.

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3

Renn, J. C., and C. Tsai. "Development of an unconventional electro-hydraulic proportional valve with fuzzy-logic controller for hydraulic presses." International Journal of Advanced Manufacturing Technology 26, no. 1-2 (February 20, 2004): 10–16. http://dx.doi.org/10.1007/s00170-003-1973-7.

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4

Song, Wei, Shuo Liu, Hongjun Pan, and Shiqiang Zhu. "Investigation on the design of hydraulic high-speed punching press with a large press force and a long press stroke." Advances in Mechanical Engineering 8, no. 12 (December 2016): 168781401668360. http://dx.doi.org/10.1177/1687814016683601.

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High-speed punching presses are widely applied in modern manufacture industry, especially in occasions of automatic production with a large or a super large quality. To obtain a better production efficiency and a wilder application in industries, it is meaningful to develop the high-speed punching presses with a large press force and a long press stroke. Considering the limitations of mechanical and servo high-speed punching presses, hydraulic technology is the most possible way to develop the high-speed punching press with a large press force and a long press stroke so far. This article has proposed a hydraulic operating principle based on the hydraulic vibration technology for the development of the high-speed punching press with a press force of 1250 kN, a press stroke of 50 mm, and a press velocity of 1000 hpm. With a simulation model built under the AMESim environment, performances of the system are obtained and analyzed. Then, parameter optimization is also carried out and discussed. Finally, the operating principle and the parameters are refined. The obtained results have proved that the design meets the aimed performances of the high-speed punching press.
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5

Yu, Jin, Yuan Li, and Xiao Kang Xu. "Simulation on Electro-Hydraulic Proportional Position Control System under Pressure Boundary Conditions." Advanced Materials Research 186 (January 2011): 21–25. http://dx.doi.org/10.4028/www.scientific.net/amr.186.21.

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Nowadays, the hydraulic straightening presses play an important role in straightening mandrels. For different mandrels, straightening forces and reductions differ. So the proportional position control system under pressure boundary conditions is required. The mathematical model of the system is deduced, and simulation of the system is carried out by MATLAB. The curves of step response and Bode diagram show that the system is steady and quick-response. The error caused by load is analyzed, which meets the straightening requirements and validates its design. The work in this paper can provide a high guidance for presses of similar kinds.
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6

Korchak, E. S. "Inverse pass of hydraulic presses and pressure unloading of working cylinders." Russian Engineering Research 31, no. 2 (February 2011): 113–15. http://dx.doi.org/10.3103/s1068798x11020110.

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7

Karpushkin, S. V., V. G. Mokrozub, A. O. Glebov, and S. V. Karpov. "Method for Determining the Parameters of Heating Systems for Hydraulic Presses." Chemical and Petroleum Engineering 56, no. 9-10 (January 2021): 744–54. http://dx.doi.org/10.1007/s10556-021-00837-9.

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8

LIN, H., Y. YIH, and G. SALVENDY. "Neural-network based fault diagnosis of hydraulic forging presses in China." International Journal of Production Research 33, no. 7 (July 1995): 1939–51. http://dx.doi.org/10.1080/00207549508904791.

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9

Yao, Jing, and Xiang Dong Kong. "Study on Process Control Characteristics of 22MN Fast Forging Hydraulic Press." Advanced Materials Research 201-203 (February 2011): 2258–62. http://dx.doi.org/10.4028/www.scientific.net/amr.201-203.2258.

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With the rapid development of modern industry, more and more high requirements for forging velocity and control precision have been proposed. Because it can not only increase productivity, but also can reduce the loss of the workpiece and save raw materials. Due to some characteristics such as high pressure, large flow, heavy moving inertia and so on, the process control performance of the fast forging hydraulic presses often have difficulty in their coordination between rapidity and stability, large shock during pressure relief and flow relief, low control accuracy and high accident rate. To overcome the negative influence and improve forging press performance, it is important to design forging curve. 22MN fast forging hydraulic press adopts electro-hydraulic proportional control system, the simulation and test results approved that the fast forging hydraulic press has high control accuracy and works stably without shock.
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10

Sun, You Song, Jian Guo Hu, Hong Bo Zheng, Ji Ping He, Ya Fang, and Wei Ping Ruan. "Energy Saving Drive for Forming Equipments." Advanced Materials Research 154-155 (October 2010): 701–7. http://dx.doi.org/10.4028/www.scientific.net/amr.154-155.701.

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Energy saving in manufacturing is the key to reduce energy consumption of unit GDP. Forming equipments are one of the biggest energy consumers. The basic reason of high energy consumption and low efficiency for current forming equipments is the mismatch between uncontrollable driving characteristics and the variable loads in forming processes. Complex transmission and control mechanisms are needed, wasting a lot of energy. The basic principles of driving were put forward to realize energy saving for forming equipments: faster in virtual strokes, slower in working strokes, stop when idling and recycling excessive energy. The servo driving based on large AC servo motors can make the driving and forming loads match each other well, realizing not only high automation and intelligence, but energy saving greatly as well. Theoretical analysis and experiments showed that by adopting AC servo driving the crank presses, hydraulic presses and screw presses could get the energy saving results of 25-70%.
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11

Dasgupta, K., A. Mukherjee, and R. Maiti. "Modeling and Dynamics of Epitrochoid Generated Orbital Rotary Piston LSHT Hydraulic Motor: A Bondgraph Approach." Journal of Manufacturing Science and Engineering 118, no. 3 (August 1, 1996): 415–21. http://dx.doi.org/10.1115/1.2831046.

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In this paper the dynamics of epitrochoid generated Orbital ‘rotary piston machine’ (ROPIMA) type ‘low speed high torque’ (LSHT) hydrostatic unit are studied. The complex variation of the volume of a chamber of such a machine with shaft rotation along with dynamic characteristics of the rotary flow distributor valve, interchamber leakages, fluid compressibility, inertia of orbiting rotor, etc. demand a structured approach to arrive at its mathematical model. In conventional approaches the system morphology gets obscured as the mathematical model is arrived at. Owing to the lack of modularity the errors in deduction of equations may remain eclipsed. Bondgraphs provide a structured approach to model engineering systems. The bondgraph model of the LSHT orbital motor is presented in this work. Relevant simulation results are discussed. The mathematical model was found to be stiff and its integrations were costly and time consuming. A tractable approach to estimate its steady state behavior is suggested and validated. The authors believe that such an approach would be suitable in the initial stages of design of such machines and in the development of control systems where these machines are used as actuators.
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12

Pil'gunov, V. N., and K. D. Yefremova. "Volumetric hydraulic drive with series connection of hydraulic actuators." Izvestia MGTU MAMI 1, no. 4 (2020): 61–69. http://dx.doi.org/10.31992/2074-0530-2020-46-4-61-69.

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The aim of the proposed work is theoretical and experimental studies of the performance of a single-channel hydraulic drive with a series connection of executive hydraulic cylinders and the de-velopment of recommendations for predicting their characteristics. The authors of the paper carried out a set of experimental studies and obtained the numerical kinematic, speed and power characteristics of a single-channel hydraulic drive with five hydraulic cylinders connected in series. It is shown that the nature of the kinematic connection is determined by the differentiation of the hydraulic cylinders. The speed of advancement of the piston of an indi-vidual hydraulic cylinder is determined by its serial number in the chain of hydraulic cylinders, while the highest speed of the piston movement is developed by the first hydraulic cylinder. The relative unevenness of the piston movement in comparison with the speed of the piston movement of the first hydraulic cylinder is determined by the differentiation of the hydraulic cylinder, while the hydraulic drive with the differentiation D = 2 has the greatest unevenness. It is shown that by the selection of the differentiation of the hydraulic cylinders, their stepwise arrangement and the displacement of the location of the bottom of the hydraulic cylinder, that it is possible to realize complex forms of the total trajectory of the points of attachment of the hydraulic cylinder rods. In the hydrostatic (power) hydraulic drive in the rod cavities of the hydraulic cylinders, depend-ing on the serial number of the hydraulic cylinder, the thrust on its rod and the differentiation set different pressure levels, and the lowest pressure will be in the piston cavity of the last hydraulic cylinder. With uniformly loaded hydraulic cylinders, the pressure in the piston cavities depends only on the number of the hydraulic cylinder and its differentiation. In a hydraulic drive with hydraulic cylinders of equal power, the last hydraulic cylinder will develop the greatest force at the lowest piston speed. In addition, the work also shows that the reproducibility of the positions of unloaded rods of hy-draulic cylinders of equal differentiation is not less than 1%. As a result of the experimental studies, a method was developed for the design of a volumetric hydraulic drive with sequential switching on of executive hydraulic cylinders, which can be used to solve the problems of hydrofication of me-chanical engineering production (bending presses, sheet stamping), in shipbuilding (ship slipways), in flexible production systems, industrial and warehouse logistics.
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13

Del Prete, Antonio, and Teresa Primo. "Sheet Metal Forming Optimization Methodology for Servo Press Process Control Improvement." Metals 10, no. 2 (February 19, 2020): 271. http://dx.doi.org/10.3390/met10020271.

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In sheet metal forming manufacturing operations the use of servo presses is gaining more interest due to the opportunity to improve process performance (quality, productivity, cost reduction, etc.). It is not yet clear how to proceed in the engineering process when this type of operating machine is used to achieve the maximum possible potential of this technology. Recently, several press builders have developed gap- and straight-sided metal forming presses adopting the mechanical servo-drive technology. The mechanical servo-drive press offers the flexibility of a hydraulic press with the speed, accuracy and reliability of a mechanical press. Servo drive presses give the opportunity to improve the productivity of process conditions and improve the quality of stamped parts. Forming simulation and numerical optimization can be useful tools to define beforehand the optimal process parameter set-up in terms of servo press downward curve properties. This is done by carrying out a sensitivity analysis of the forming parameters having influence on said curve. The authors have developed a numerical methodology able to analyze the influence factors, for comparison with the degrees of freedom made available by the usage of a servo press, in terms of stroke profile management, to obtain an optimized process parameters combination.
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14

Zheng, Hao, Yixiong Feng, Jianrong Tan, and Zixian Zhang. "An integrated modular design methodology based on maintenance performance consideration." Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture 231, no. 2 (August 8, 2016): 313–28. http://dx.doi.org/10.1177/0954405415573060.

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Maintenance nowadays not only plays a crucial role in the usage phase, but is fast becoming the primary focus of the design stage—especially with general increased emphasis on product service. The modularization of maintenance has been explored rarely by previous researchers, despite its significant potential benefit. Existing modular design methods on life cycle do not sufficiently improve maintenance performance as a whole. In effort to remedy this, this article considers relevant maintenance issues at early stages of product development and presents a novel modular methodology based on the simultaneous consideration of maintenance and modularity characteristics. The proposed method first employs the design structure matrix to analyze the comprehensive correlation among components. Next, based on graph theory, initial modules with high cohesion and low coupling are generated. After that, a maintenance performance multi-objective model is established for further optimization to minimize maintenance costs, minimize differences in the maintenance cycle, and maximize system availability. To conclude, an improved strength Pareto evolutionary algorithm 2 is used for modular optimization. The complete methodology is demonstrated using a case study with a hydraulic press, where results reveal that the optimized modules can reduce maintenance cost under the premise of approximately constant modular performance.
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15

Balakin, V. F., S. L. Stasevskyi, V. D, Dobriak, and Yu D. Uhriumov. "Improving the preparation of the liner for rolling on the pilger mill." Metallurgicheskaya i gornorudnaya promyshlennost, №4, 2018, no. 4 (August 2018): 39–44. http://dx.doi.org/10.33101/s04-38748594.

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Purpose. Based on the analysis of the features of the hot piligrim pipe rolling process, develop a new and improved method for preparing liners on the mandrel by compressing their hind ends with specialized strikers of a horizontal hydraulic press. Metodology. The solution to the problem of determining the average specific application on the contact of the liner with the mandrel during compression of its rear end by specialized press dies using the method of slip lines. Findings. The article presents the results of a theoretical determination of the average specific pressure and the width of the contact surface area between the sleeve and the mandrel when the rear end of the sleeve is compressed by specialized strikers of a horizontal hydraulic press. The results obtained allow us to determine the conditions for preventing the liner from slipping from the mandrel as they move toward the rollers in the braking phase. Originality. The main factors affecting the adhesion of the liner to the mandrel were determined, and the values of average specific pressures on the contact of the metal with the mandrel were calculated during the reduction by the profile dies, as well as the width of the contact area and the required thickness of the dies. It has been established that the thickness of the strikers of a double-sided press can be assumed to be the same for all sizes of sleeves of the assortment TPA 5-12 ''. Practical value. The results of the theoretical studies can be used to modernize and reconstruct a section of the off-site charging of a pilger mill TPA 5-12 '' by installing horizontal hydraulic presses with double-die profile dies. This will increase the productivity of the mill by preventing the sleeve from sliding down the mandrel during roll-up to the rolls by creating the necessary adhesion forces between the sleeve and the mandrel. In addition, it will facilitate the conditions of the seed regime piligrim rolling, which will reduce machine time and increase productivity. Key words: pipe, liner, pilgrim mill, hydraulic press, hammer head, mandrel, performance.
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16

Efremova, K. D., and V. N. Pilgunov. "Using a Multi - function Pressure Valve in Volumetric Hydraulics Drives." Mechanical Engineering and Computer Science, no. 3 (May 1, 2019): 1–14. http://dx.doi.org/10.24108/0319.0001476.

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The paper deals with using hydraulic equipment for pressure and flow control in volumetric hydraulic drives to control a throttle movement speed of the output link of an executive hydraulic motor. Depending on the type of problem to be solved, hydraulic equipment is divided into the pressure and flow control, and the shutoff and regulating elements used in equipment are divided into those of valve and spool type. The main paper objective is to analyse designs and feasibilities for using a multi-functional pressure valve to solve real-life problems of control in a volumetric hydraulic drive. The paper presents a multi-function indirect pressure valve design of DZ standard size (Rezroth Bosch Group) and its detailed principle of operation. In the multifunctional pressure valve design there are threaded plugs, the combination of which allows us to control the pilot valve, using the pressure in the hydraulic system (internal control) or the pilot valve control from an external pressure source. Pilot drainage to the valve outlet port (internal drainage) or drainage directly to the tank is possible. It is shown that the term “Load Sensing System” that is used in Western equipment to mean “control based on load magnitude” can be correctly used to describe designs for using a multifunctional valve.Issues on setting up internal functional communications of the valve to select feed modes of a pilot valve and its drainage have been fully considered. By examples of using a multifunctional pressure valve, the valve operation capabilities are shown, namely as an overflow valve, a sequence one, its operation in the balancing scheme of the gravity load and as part of a hydraulic drive with alternating load. The use of multi-function pressure valve in presses allows us to increase the pressing force through using the weight of the punch. The article belongs to the category of systems engineering, and the represented options of the using valve can be applied when designing the volumetric hydraulic drives with throttle control of the movement speed of the output link in hydraulic drives.
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17

Čechavičius, Rimantas. "PECULARITIES OF CALCULATION AND STRENGTHENING OF GLULAM TIMBER BEAMS." JOURNAL OF CIVIL ENGINEERING AND MANAGEMENT 3, no. 11 (September 30, 1997): 15–23. http://dx.doi.org/10.3846/13921525.1997.10531348.

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This paper deals with analysis of pecularities of design and strengthening of tapered, curved and pitched cambered glulam beams under action of lateral tension. The formulas and drawings presented give the possibility for addition and clarification of existed design methods of such beams in our country. For strengthening the apex zone of pitched cambered beams the author offers the way of precompression of the member according to the patent of Lithuanian Republic No 2045. By the use of this method it is possible to increase bearing capacity, fire resistance and durability of glulam bearing elements. The given method allows to simplify manufacturing of alike elements and to improve their technology. Another method (according to the patent of Lithuanian Republic No 2046) also gives the solution of the problem of setting inserts of any size and shape made of different materials. The inserts are used for joint constructions as well as for strengthening dangerous places. The method is carried out in the following way. The most strained parts of wooden bearing element are set and inserts are installed where needed. Corresponding grooves, usually longitudinal, are made before glueing separate planks. The planks having been glued into one piece, grooves of wanted size and shape are made. Inserts of different shape are set into package during its assemblage. In such cases inserts serve as additional plank package fixers. After that by means of pneumatic or hydraulic presses pressurization and final element treatment follows. Alongside of flat inserts another method of insert setting may be used: planks after corresponding grooves have been made are stowed into package and by means of diaphragm made of steel or any other like material are fixed into a position. Then pressurization by pneumatic or hydraulic presses, extraction of diaphragms out of grooves, setting of flat glued inserts into grooves follows. The given method may be applied at any glulam bearing elements plant. The usage of this glulam bearing element strengthening method assures the following advantages: the possibility of making grooves of any size and shape, as well as setting corresponding inserts into grooves which help to strengthen and connect the elements. It allows not only to increase the bearing capacity and durability, but also the fire resistance of the given element. The usage of nonmetallic inserts increase dielectricity or “ratio transparency” of structures.
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18

Gontarz, Andrzej, Krzysztof Drozdowski, Anna Dziubinska, and Grzegorz Winiarski. "A study of a new screw press forging process for producing aircraft drop forgings made of magnesium alloy AZ61A." Aircraft Engineering and Aerospace Technology 90, no. 3 (April 9, 2018): 559–65. http://dx.doi.org/10.1108/aeat-11-2016-0238.

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Purpose The aim of this study is to develop a die forging process for producing aircraft components made of magnesium alloy AZ61A using a screw press. Design/methodology/approach The proposed forging technique has been developed based on the results of a numerical and experimental research. The required forging temperature has been determined by upsetting cylindrical specimens on a screw press to examine both plasticity of the alloy and the quality of its microstructure. The next stage involved performing numerical simulations of the designed forging processes for producing forgings of a door handle and a bracket, both made of magnesium alloy AZ61A. The finite element method based on simulation programme, Deform 3D has been used for numerical modelling. The numerical results revealed that the forgings are free from material overheating and shape defects. In addition to this, the results have also helped determine the regions that are the most prone to cracking. The final stage of the research involved performing forging tests on a screw press under industrial conditions. The forgings of door handles and brackets were made, and then these were tested for their mechanical and structural properties. The results served as a basis for assessing both the viability of the designed technique and the quality of the produced parts. Findings The experimental results demonstrate that aircraft components made of magnesium alloy AZ61A can be produced by die forging on screw presses. The results have been used to determine the fundamental parameters of the process such as the optimum forging temperature, the method of tool heating, the way of cooling parts after the forging process, and the method of thermal treatment. The results of the mechanical and structural tests confirm that the products meet the required quality standards. Practical implications The developed forging technique for alloy AZ61A has been implemented by the forging plant ZOP Co. Ltd in Swidnik (Poland), which specializes in the manufacturing of aircraft components made of non-ferrous metal alloys. Originality/value Currently, the global tendency is to forge magnesium alloys (including alloy AZ61A) on free hydraulic presses using expensive die-heating systems. For this reason, the production efficiency of such forging processes is low, while the manufacturing costs are high. The proposed forging technique for alloy AZ61A is an innovative method for producing forgings using relatively fast and efficient machines (screw presses). The proposed forging method can be implemented by forging plants equipped with standard stocks of tools, which increases the range of potential manufacturers of magnesium alloy products. In addition, this technology is highly efficient and ensures reduced manufacturing costs.
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19

Alexa, Octavian, Constantin Ovidiu Ilie, Marin Marinescu, Valentin Vinturis, and Marian Truta. "Simulating the Torque and Angular Speed Distribution within a Heavy Vehicle’s Planetary Gearbox." Applied Mechanics and Materials 659 (October 2014): 127–32. http://dx.doi.org/10.4028/www.scientific.net/amm.659.127.

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Simulating the real-time working of a system a complex challenge that had been developed lately within almost all fields of activity, of course including mechanical engineering as well. If one wants to reveal the torque and angular speed distribution onto the elements of a planetary gearbox, issuing a virtual model was previously needed. This model should replicate both the physical structure and the real working behavior.The modeled and simulated gearbox is a planetary type one. The power flows along the gearbox throughout three simple planetary mechanisms (sun gear and crown type) by successively locking different components with the aid of some multi-plate clutches (acting as locking clutches or brakes). The simulation of the friction element’s engagement is achieved by introducing a physical signal that replaces the pressure of the hydraulic command system. We mention that the pressure evolution has been previously experimentally determined, in order to model the force that acts on the actuator’s piston that, at its turn, presses the plates.The paper reveals the working cycles of the friction elements as well as the working modes of the planetary sets. It also reveals the time histories of the power flowing throughout the gearbox. The friction elements are modeled considering their three working stages: fully disengaged, partially engaged and fully engaged. The planetary sets are modeled starting from Willis equation for the speed distribution. For the torque distribution we used the energy conservation law as well as the torque balance law.Should be also mentioned that the virtual simulating model took into account the effects of the twisting vibrations, spinning inertia of the mechanical components and shafts’ elasticity.
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20

"Hydraulic filter presses." Metal Finishing 101, no. 1 (January 2003): 50. http://dx.doi.org/10.1016/s0026-0576(03)80015-6.

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21

"CNC-made seals preferred for hydraulic presses." Sealing Technology 1994, no. 7 (July 1994): 2–3. http://dx.doi.org/10.1016/1350-4789(94)90199-6.

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22

"Closed loop control of hybrid hydraulic/mechanical compacting presses." Metal Powder Report 50, no. 9 (September 1995): 38. http://dx.doi.org/10.1016/0026-0657(95)93287-9.

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23

Schenke, Christer, and Jürgen Weber. "Energy Efficiency of Displacement Control Drive Systems in Hydraulic Forming Presses." Journal of Manufacturing Science and Engineering 141, no. 4 (February 28, 2019). http://dx.doi.org/10.1115/1.4042604.

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Hydraulic deep drawing presses are manifold machines that can be used for a number of use cases. The general need for the reduction of the energy consumption of industrial machines forces press manufacturers and owners to optimize their machines and processes. This article presents methods for the analysis and optimization of the drive systems of a hydraulic deep drawing press with four-point die cushion. For the slide drive, two alternatives of control methods for speed variable displacement pumps are compared to the conventionally used displacement pump with a constant speed. For the drive of the die cushion, two displacement control drive systems are compared to a conventional valve drive system.
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24

"Mechanical and hydraulic multi-platen presses for production of complicated PM parts." Metal Powder Report 49, no. 9 (September 1994): 54. http://dx.doi.org/10.1016/0026-0657(94)92031-1.

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