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System construction of a four-side primary permanent-magnet linear motor drive mechanical press

Frontiers of mechanical Engineering 2020年第4期15卷 600-609页

作者： Jintao LIANG Zhengfeng MING Peida LI School of Mechano-Electronic Engineering Xidian UniversityXi’an 710071China

A primary permanent-magnet linear motor (PPMLM) has a robust secondary structure and high force density and is appropriate for direct-drive mechanical press. The structure of a four-side PPMLM drive press is presented based on our previous research. The entire press control system is constructed to realize various flexible forming processes. The control system scheme is determined in accordance with the mathematical model of PPMLM, and active disturbance rejection control is implemented in the servo controller. Field-circuit coupling simulation is applied to estimate the system’s performance. Then, a press prototype with 6 kN nominal force is fabricated, and the hardware platform of the control system is constructed for experimental study. Punch strokes with 0.06 m displacement are implemented at trapezoidal speeds of 0.1 and 0.2 m/s;the dynamic position tracking errors are less than 0.45 and 0.82 mm, respectively. Afterward, continuous reciprocating strokes are performed, and the positioning errors at the bottom dead center are less than 0.015 mm. Complex pulse trajectories are also achieved. The proposed PPMLM drive press exhibits a fast dynamic response and favorable tracking precision and is suitable for various forming processes.

关键词： mechanical press direct drive primary permanent-magnet linear motor(PPMLM) servo system active disturbance rejection control(ADRC) prototype experiment

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Reconstruction of impact force of mechanical press in time domain

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Journal of Southeast University(English Edition) 2011年第4期27卷 400-404页

作者：何鹏程贾方东南大学机械工程学院南京211189

To overcome the difficulty in directly measuring the impact force of a mechanical press, the inverse theory is employed to reconstruct the impact force from the corresponding response data in time domain. The nature of ill-posedness of impact force reconstruction is explored through singular value decomposition （SVD） and the Tikhonov regularization is utilized to deal with the ill-posedness, in which the optimal parameter is chosen in light of the L-curve criterion and the generalized cross- validation （GCV）. The experimentally measured strain responses of upper and lower dies of the press are chosen as source data for impact force reconstruction, and the corresponding numerical results are compared with the experimental measurements, which verifies the effectiveness of the reconstruction method.

关键词： mechanical press impact force reconstruction inverse problem regularization

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Research on Hybrid Input mechanical press Driven by Two Motors

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Journal of China University of Mining and Technology 2006年第1期16卷 57-60页

作者： HE Yu-peng ZHAO Sheng-dun ZOU Jun ZHANG Zhi-yuan WANG Bao-an School of mechanical Engineering Xi＇an Jiaotong University Xi＇an Shaanxi 710049 China School of Foreign Language Henan Agricultural University Zhengzhou Henan 450002 China

Given the speed requirements of a mechanical press slider, a differential gear train is adopted instead of the belt and gear drive of a general mechanical press. Two electric motors are used to drive the differential gear train with hybrid input. Based on the working principle of a differential gear train, the angular speed equations and the power dis- tribution equations of the input-output system are established. By controlling the angular speeds of the two motors, the slider can move at different speeds. Taken a JH23-100 type mechanical press as example, the driving system is designed and the power of two motors determined. The simulated results show that the highest slider speed in the mechanical press approaches 39 mm/s only at the forging-punching stage, far less than the 232 mm/s of a general JH23-100 type mechanical press. This provides a new scheme to realize low-speed forging-punching technology from a mechanical press.

关键词： mechanical press hybrid input differential gear train electric motor

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Dynamic Modeling and Experiment of a New Type of Parallel Servo press Considering Gravity Counterbalance

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Chinese Journal of mechanical Engineering 2013年第6期26卷 1222-1233页

作者： HE Jun GAO Feng BAI Yongjun WU Shengfu State Key Laboratory of mechanical System and Vibration Shanghai Jiao Tong University China First Heavy Industries

The large capacity servo press is traditionally realized by means of redundant actuation, however there exist the over-constraint problem and interference among actuators, which increases the control difficulty and the product cost. A new type of press mechanism with parallel topology is presented to develop the mechanical servo press with high stamping capacity. The dynamic model considering gravity counterbalance is proposed based on the virtual work principle, and then the effect of counterbalance cylinder on the dynamic performance of the servo press is studied. It is found that the motor torque required to operate the press is a lot less than the others when the ratio of the counterbalance force to the gravity of ram is in the vicinity of 1.0. The stamping force of the real press prototype can reach up to 25 MN on the position of 13 mm away from the bottom dead center. The typical deep-drawing process with 1 200 mm stroke at 8 strokes per minute is proposed by means of five order polynomial. On this process condition, the driving torques are calculated based on the above dynamic model and the torque measuring test is also carried out on the prototype. It is shown that the curve trend of calculation torque is consistent to the measured result and that the average error is less than 15%. The parallel mechanism is introduced into the development of large capacity servo press to avoid the over-constraint and interference of traditional redundant actuation, and its dynamic characteristics with gravity counterbalance are presented.

关键词： mechanical press parallel mechanism dynamic modeling virtual work principle

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