高速精密压力机多连杆驱动机构的运动学特性  

Kinematics characteristics of multi-link driving mechanism for high speed precision press

作　　者：鹿新建[1,2,3] 黄辉祥 谭启檐 梅碧舟 Lu Xinjian;Huang Huixiang;Tan Qiyan;Mei Bizhou(School of Mechanical Engineering,Nanjing Institute of Technology,Nanjing 211167,China;Research Department of Intelligent Manufacturing Equipment,Nanjing Institute of Technology,Nanjing 211167,China;Jiangsu Shuangying Metal Forming Machine Co.,Ltd.,Yangzhou 225000,China;Zhejiang Easy Forging Precision Machinery Co.,Ltd.,Ningbo 315702,China)

机构地区：[1]南京工程学院机械工程学院,江苏南京211167 [2]南京工程学院智能制造装备研究院,江苏南京211167 [3]江苏双赢锻压机床有限公司,江苏扬州225000 [4]浙江易锻精密机械有限公司,浙江宁波315702

出　　处：《锻压技术》2022年第7期194-199,共6页Forging & Stamping Technology

摘　　要：对某型高速精密压力机的多连杆驱动机构进行了简化,基于杆组法,使用Matlab进行了滑块的位移和速度方程求解,结果表明:与相同行程的曲柄滑块机构为工作机构的高速精密压力机相比,该多连杆驱动机构提前9°达到公称力行程位置,相应的滑块速度降低了26.4%,有助于提高冲压精度;增力系数曲线为不对称形态,左侧数值小于曲柄滑块机构,右侧则大于曲柄滑块机构。建立了该机构的误差传递函数并在Matlab中进行了编程计算,结果表明:曲柄半径、连杆3和连杆5和坐标x_(56)的误差传递函数在上死点和下死点处出现极值,连杆3和坐标x_(56)的误差传递函数为正值且几乎一致,导致滑块位置向上偏移。建立了考虑杆系热变形的、在下死点位置处的误差方程,为下死点精度的稳定奠定了设计基础。The multi-link drive mechanism of a high-speed precision press was simplified,and based on rod group method,the displacement and velocity equations of slider were solved by Matlab.The results show that compared with high-speed precision press with crank-slider mechanism of the same stroke as the working mechanism,the multi-link drive mechanism reaches the nominal force stroke position for 9°in advance,and the corresponding slider speed is reduced by 26.4%,which helps to improve the stamping precision.The force-enforcement coefficient curve is asymmetrical,the value on the left is smaller than that of the crank-slider mechanism,and the value on the right is greater than that of the crank-slider mechanism.The error transfer functions of the mechanism are established and calculated in Matlab.The results show that the error transfer functions of crank radius,connecting rod 3,connecting rod 5 and coordinate x_(56) have extreme values at the top dead center and the bottom dead center,and the error transfer functions of connecting rod 3 and coordinate x_(56) are positive and nearly identical,which causes the slider position to shift upwards.Considering the thermal deformation of rod system,the error equation at the bottom dead center is established,which lays a design foundation for the stability of the bottom dead center.

关 键 词：多连杆驱动机构 高速精密压力机 增力系数 下死点 误差传递函数 

分 类 号：TH16[机械工程—机械制造及自动化] TH11