高速冲床肘节机构的运动特性研究  

Kinetic characteristics of toggle mechanism of high-speed punch

作　　者：李义强 戴惠良[1] 张治军 彭进利 LI Yi-qiang;DAI Hui-liang;ZHANG Zhi-jun;PENG Jin-li(School of Mechanical Engineering,Donghua University,Shanghai 201620,China;Zhejiang SEFTEC Precision Machinery Co.,Ltd.,Jiaxing 314300,China)

机构地区：[1]东华大学机械工程学院,上海201620 [2]浙江帅锋精密机械制造有限公司,浙江嘉兴314300

出　　处：《机电工程》2020年第7期743-750,共8页Journal of Mechanical & Electrical Engineering

基　　金：上海市自然科学基金资助项目(19ZR1401500)。

摘　　要：针对传统曲轴式高速冲床难以获得理想冲压曲线的问题,以帅锋公司Best-30肘节式高速冲床为例,对肘节机构的运动特性进行了理论推导、仿真分析和试验测试研究。用杆组分析法推导了肘节机构滑块的运动学方程,对肘节机构各连杆进行了动态静力学分析;利用ADAMS软件对肘节机构进行了运动学和动力学仿真分析,并研究了不同曲柄长度、转速对运动特性的影响;最后搭建了测试平台,进行了滑块的下死点精度测试,结合测试结果对仿真结果进行了验证。研究结果表明:肘节机构的运动特性明显优于曲柄滑块机构,下死点加速度减小了52.92%,速度最值增大了13.34%;肘节机构急回特性好,回程时间为去程时间的1/2;下死点动态位置精度高,瞬时精度小于0.004 mm,长时精度小于0.02 mm,满足精密级冲床要求。Aiming at the problem of difficult to obtain the ideal stamping curve for the traditional crankshaft high-speed press,a comprehensive study of kinetic characteristics of SEFTEC Best-30 toggle high-speed press was executed by means of theory,simulation and experiment analysis.Bar group analysis was used to derive the kinematics equation,and the force of each component was analyzed.Based on the ADAMS software,the kinematics and dynamics simulation analysis of toggle mechanism was carried out,and the effects of different crank length and rotation speed on the motion characteristics were explored.Finally,the test platform was established to perform dynamic characteristics of the bottom dead center and verify the simulation results.The results indicate that the kinematic mechanism of toggle mechanism is obviously better than the crank mechanism,the bottom dead center acceleration is reduced by 52.92%,and the speed extreme value is increased by 13.34%.The toggle mechanism has a good quick return characteristic,and the return time is half of the departure time.The bottom dead center has high dynamic precision,the instantaneous precision is less than 0.004 mm,and the everlasting precision is less than 0.02 mm,which meets the requirements of precision punching.

关 键 词：高速冲床 肘节机构 运动特性 下死点 

分 类 号：TH132[机械工程—机械制造及自动化] TH113.2