Online prediction and control method for compensation regulation value in grinding processes

Peng Zheng,Xue-Hao Tian,Dong-Liang Liu,Zhan-Xin Zhi,Lin-Na Zhang

doi:10.1177/1687814019837105

Abstract

In any grinding process, compensation regulation value is a crucial factor for maintaining precision during the batch processing of workpieces. Geometric characteristics, buffing allowance, temperature, wheel speed, and workpiece speed are the main factors that affect compensation regulation value in any grinding process. In this article, a novel prediction method for compensation regulation value is proposed based on incremental support vector machine and mixed kernel function. The support vectors for the prediction model are extracted using the convex hull vertex optimization algorithm, and the speed of the operation can be increased effectively. In addition, the parameters of the model are optimized using cross-validation optimization method to improve the accuracy of the prediction model. Then, the feedback control strategy of compensation regulation value for the grinding process is also proposed. Single-factor and multi-factor experiments are implemented respectively using the proposed method. The results verify the feasibility and effectiveness of the proposed method. It is also noted that the machining accuracy is improved significantly in comparison with the machining without prediction and compensation control. Moreover, by applying the prediction compensation control of compensation regulation value to the active measurement and control of the grinding process, a feedback system is formed, and then the intelligentization of the grinding system can be realized.

Highlights

Grinding is an important machining method, and the quality of the workpiece is determined by the precision of the grinding process.[1]
When a single factor is considered, the prediction model is developed separately based on workpiece diameter, buffing allowance, temperature, wheel speed, and workpiece speed
On the basis of comprehensive factors analysis, the prediction model to predict compensation regulation value (CRV) is created with the training sets, which are optimized by convex hull vertex algorithm

Summary

Introduction

Grinding is an important machining method, and the quality of the workpiece is determined by the precision of the grinding process.[1]. 3. The set of training samples for the prediction model is f(xi, yi)g, where, xi is the input value and yi is the CRV. The sampling error is averaged, and at the same time, the average of the measurement size and the compensation value are calculated to fit the real grinding process modeling data.

Results

Conclusion