Stress characteristics and fracture wear of brazed CBN grains in monolayer grinding wheels

被引：59

作者：

Ding, Wenfeng ^{[1
,2
]}

Zhu, Yejun ^{[1
]}

Zhang, Liangchi ^{[2
]}

Xu, Jiuhua ^{[1
]}

Fu, Yucan ^{[1
]}

Liu, Weidong ^{[2
]}

Yang, Changyong ^{[1
]}

机构：

[1] Nanjing Univ Aeronaut & Astronaut, Coll Mech & Elect Engn, Nanjing 210016, Jiangsu, Peoples R China

[2] Univ New S Wales, Sch Mech & Mfg Engn, Lab Precis & Nano Proc Technol, Sydney, NSW 2052, Australia

来源：

WEAR | 2015年 / 332卷

基金：

澳大利亚研究理事会; 中国国家自然科学基金;

关键词：

Fracture; Residual stress; Ultra-hard materials; Cutting tools; Finite element modeling; RESIDUAL-STRESS; MECHANICAL-PROPERTIES; BEHAVIOR; MICROSTRUCTURE; INTERFACE; STEEL; FILMS; TI;

D O I：

10.1016/j.wear.2014.12.008

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

Compared to electroplated cubic boron nitride (CBN) grinding wheels, monolayer-brazed CBN wheels have a distinguished advantage in high bonding strength to super-abrasive grains. However, fracture-induced grain wear can occur during grinding. This study aims to understand the mechanism of such fracture, and hence to predict the fracture based on a stress analysis. A two-dimensional finite element (FE) model was developed to investigate the stress characteristics and fracture wear of the grains. The effects of grain embedding depth, grain wear, bond wear, grain size and grinding load on the stress distribution were investigated. It was found that grain macro-fracture wear is dominated by the brazing stresses in the junction region of a CBN grain, and that the peak brazing stress reduces with the increase in the grain embedding depth, grain size and undeformed chip thickness. This suppresses the possibility of grain macro-fracture wear in grinding. (C) 2014 Elsevier B.V. All rights reserved.

引用

页码：800 / 809

页数：10

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