Transactions of Materials and Heat Treatment

Title：Optimization on rigidity-flexibility coupling motion characteristics for hyperbolic elbow clamping mechanism in die-casting machine

Authors： Wang Chang1 Zhang Zhicheng1 Zhang Liliang2 Wei Yanfeng3 Song Hongyan3

Unit： 1. School of Mechanical Engineering Inner Mongolia University of Science and Technology 2. Laiwu Iron and Steel Group Yinshan Section Steel Co. Ltd. 3. Shandong Iron and Steel Co. Ltd. Laiwu Branch Profile Steel Plant

KeyWords： hot chamber die-casting machine hyperbolic elbow clamping mechanism rigid-flexible coupling motion characteristics clamping force

ClassificationCode：TH113

year,vol(issue):pagenumber：2024,49(10):137-142

Abstract：

The production efficiency and service life of hot chamber die-casting machine, and the forming quality of die-casting part are influenced by the performance of its clamping mechanism. Therefore, using the multi software collaborative creation method, the crosshead rod, brace, rear elbow, front elbow and pull rod were taken as flexible bodies by software Ansys, which was import into the software Adams for rigid-flexible coupling dynamic analysis, and the influences of elastic deformation on the locking accuracy and motion characteristics of clamping mechanism were studied. Then, by comparing the locking force and dynamic template displacement, velocity and acceleration curves obtained from the simulation of rigid body system and rigid-flexible coupling system, the locking force of the rigid-flexible coupling system was greater than that of the rigid body system, with a maximum displacement difference of 0.573 mm, and the velocity of the rigid-flexible coupling system fluctuated during the start-up phase after collision with mold, with a peak acceleration of 1282.2549 mm·s-2. Furthermore, the high peak acceleration led to a large dynamic load in the motion pair, and the input scheme of the drive speed for crosshead rod seriously affected the motion characteristics of clamping mechanism. In addition, a drive optimization scheme by using sine curve acceleration, high-speed motion midway, cosine curve deceleration and finally low-speed motion was proposed to complete the mold clamping motion. The optimization results show that the speed changes smoothly, and the peak acceleration decreases to 237.0416 mm·s-2, which is 81.51% less than that before optimization, effectively optimizing the motion characteristics of clamping mechanism and reducing the wear of motion pair.

Funds：

内蒙古自然科学基金资助项目（2022LHMS05001）

作者简介：王昌（1967-），男，硕士，教授,E-mail：wangchang888@sina.com;通信作者：张智铖（1999-），男，硕士研究生,E-mail：2021023240@stu.imust.edu.cn

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