Research on full closed loop NC system of linear cutting machine for high accuracy internal gear machining

Abstract

An appropriate model is established to analyze angular displacement error in machining process of linear cutting machine in paper. Analysis results are as follows: as the radius of machining decreases, the angle errors become larger. For the same radius of machining, the increasing angular indexing causes increasingly larger indexing error. When θ is 45 degree, indexing error reaches the maximum, and after 45 degree, indexing error begins to reduce. In order to improve the indexing accuracy of internal gear machining and automation level, full closed-loop numerical control system of linear cutting machine with high precision for internal gear machining is designed. The whole system consists of three parts including molybdenum wire automatic measurement and compensation system, hollow rotary table-type intelligent time grating sensor and control system of linear cutting machine. Here the time grating sensor provides angle information feedback for full closed-loop control system. The experimental results demonstrate that the linear cutting machining of internal gear is realized with full-automatic, high-precision and low-cost.