锻压技术

高速精密压力机多连杆驱动机构的运动学特性

英文标题：Kinematics characteristics of multi-link driving mechanism for high speed precision press

作者：鹿新建黄辉祥谭启檐梅碧舟

分类号：TH16；TH11

出版年,卷(期):页码：2022,47(7):194-199

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x56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x56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 x56 have extreme values at the top dead center and the bottom dead center, and the error transfer functions of connecting rod 3 and coordinate x56 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.

基金项目：

作者简介：鹿新建（1978-），男，博士，副教授 E-mail：50547481@qq.com

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