Research On The Feed Control System Of The Electrolytic Grinding Experimental Device For High-speed Steel Roll Material

High-speed steel rolls have become excellent roll varieties in recent years due to a series of excellent performances such as high abrasion resistance,toughness,hardenability and thermal stability.However,their excellent comprehensive performance also brings great difficulties to their grinding process,which has become a bottleneck hindering the development of high-speed steel rolls.Compared with traditional machining,electrolytic grinding has incomparable advantages in material removal rate,surface accuracy,etc.It is one of the effective methods to solve this kind of "difficult grinding" problem.Therefore,electrolytic grinding technology of high-speed steel roll material is a hot research topic in manufacturing industry.Deep research and development of electrolytic grinding equipment and control system for this material is of great practical significance to promote its related technical progress.This paper takes feed control system of electrolytic grinding experimental device for high-speed steel roll material as research object,independently develops its mechanical structure and focuses on research and development of control system and control method.The main work is as follows:(1)The general scheme of electrolytic grinding experimental device for high-speed steel roll material is designed.On this basis,the overall structure of cathode feed system is mainly designed.At the same time,the key components in the system are developed according to the results of stress analysis and the static structure analysis is carried out by using finite element method,which verifies that the feed system meets the design requirements and has a reasonable structure.(2)Machining gap control is the key and difficult point in the feed control system.To solve this problem,a machining gap controller based on the principle of fuzzy-PI dual-mode control with correction factor is designed.The controller parameters are further set by the gap model of electrolytic grinding of high-speed steel roll material constructed by simulation platform.At the same time,the performance of the controller is compared with that of a single control method.The results show that the dual-mode control performs better in eliminating steady-state error and improving response speed.(3)In order to achieve high accuracy of feed control system.To this end,a feed control system scheme is formulated,based on which the configuration of system hardware structure,software program and interactive interface program are completed.At the same time,the designed gap controller is embedded into the main program,and finally,a feed control system of electrolytic grinding experimental device for high-speed steel roll material with gap control is in tegrated.(4)In order to verify the reliability and validity of the feed control system,an experimental study on the control performance of the system and the control effect of machining gap is carried out at the end of the paper.The experiments on tool,motion precision,control method of machining gap and clearance control effect after changing parameters are carried out with the initial clearance.The results show that the tool setting function and motion precision of the feed control system meet the design criteria.The machining gap controller based on dual-mode control principle studied can effectively improve the dynamic performance of the system and has good robustness.