A research on the mechanism and model of surface micro-damage in grinding hardening

Xiaoliang Shi,Shichao Xiu,Xiuming Zhang

doi:10.1177/16878140211044958

Abstract

Grinding hardening can obtain hardening effect besides fine machining effect on the surface of workpiece. A certain degree of surface micro-damage will be formed during grinding hardening process which mainly contains micro-crack, melting coating, decarburization, and surface scratch. In order to study the micro-damage of grinding hardening, the paper carries on a grinding hardening experiment and the characteristics of micro-damage are observed. The generation mechanism of micro-crack is revealed. It is formed by the accumulation of dislocation pile-up in the condition of grinding hardening process. When the grinding depth reaches a certain value, the surface micro-crack will be produced obviously and become more serious with the increasing of grinding depth. Other micro-damage containing surface melting coating, decarburization, and surface scratch are also studied and their relevance with micro-crack is revealed. Based on the grinding hardening theory and pile-up dislocation theory, a model for micro-crack of grinding hardening is established. The calculating result of the model accords with the experimental result in general.

Highlights

Grinding process is always performed as the final process in mechanical manufacturing and it has a high machining precision
Grinding hardening in dry condition can produce a certain degree of reinforcement on the workpiece surface.[1,2,3]
The phenomenon is because the dislocation pile-up of the workpiece surface during grinding hardening increases with the increasing of grinding depth

Summary

Introduction

Grinding process is always performed as the final process in mechanical manufacturing and it has a high machining precision. Keywords Grinding hardening, surface, micro-damage, micro-crack, melting coating, scratch, model The generation mechanism of micro-crack during grinding hardening is revealed based on the dislocation theory of pile-up.

Results

Conclusion