A speed optimization algorithm based on the contour error model of lag synchronization for CNC cam grinding

Abstract

In CNC cam grinding, the contour error will inevitably exceed the regular range when two axes have different lag caused by the high-speed grinding regardless of the dynamic characteristics of an individual system. To address this problem, a new speed algorithm is proposed in this paper, which is based on a new contour error model using the idea of lag synchronization and can improve the contour accuracy. In this work, a new concept of relative speed that is grinding carriage to the cam is first proposed, and the parametric equations of the relative speed are constructed. In comparison with the constant angular velocity grinding, it demonstrates that significant improvements in contouring accuracy can be realized through such an approach. Furthermore, two practical examples are given to verify the accuracy and reliability. The application results illustrate the cam contour error is less than 0.01 mm.

A Review of Key Technologies for Friction Nonlinearity in an Electro-Hydraulic Servo System

“…Time lag model [34] Demonstrates frictional memory behavior. Descriptions of other friction phenomena are missing.…”

A Feedrate Planning Method in CNC System Based on Servo Response Error Model

“…In [21,22], a second-order contour error model is established for investigation and feedrate constraints determination. In [23], a lag synchronization-based contour error model is developed and utilized to optimize the feedrate constraint. In [24], an adaptive feedrate scheduling method is developed to improve contour precision according to specified constraints.…”