Design and simulations of non-uniform velocity motion curves for a slider-crank servo press

The purpose of this paper is to develop and test a new design approach for stamping process curves based on the main transmission structure of a slider-crank servo press.

A numerical simulation approach for the slider and crank motion curve shape is developed on the basis of the forward and inverse kinematics models. A general method of curve segment connection is analyzed and discussed. Examples and experiments are also given to verify the feasibility of this work.

By properly connecting the basic curve segments, such as the constant velocity and cycloid trajectory segments, the designed curve can be incorporated into the output motion. The basic curve segments can be used as backups and stored in a curve repository. Different requirements of stamping process curves can be obtained by connecting the newly designed curve segments and selected existing curve segments. That the design approach has transferability to similar problems is encouraging.

This study provides a new method of designing curves for non-uniform velocity motion by connecting commonly used basic curve segments. It is characterized by simple operation and small calculating amount. Different curves can be obtained by connecting the newly designed segments and selected existing segments. Choosing simple curve segments freely can maintain minimum power dissipation in non-working intervals. The method can obtain minimum peak values of acceleration and jerk in the connection interval. Basic curve segments can also be used as backups and stored in a curve repository to improve the efficiency of design.