基于有限元法的硬质合金微槽车刀刀—屑接触摩擦模型研究
2018-10-19
作者：蒋宏婉1，2，袁森1，2，陈海虹1，任仲伟1，占刚2
单位：1贵州理工学院；2贵州大学
摘要：刀—屑接触界面的应力应变状态对金属切削过程尤其是刀具的摩擦磨损研究有着重要影响，摩擦模型是该区域应力应变的数学表达形式。本文基于有限元仿真平台，重点分析微槽车刀切削过程中刀—屑接触界面的摩擦状态，确定出刀—屑接触总长度和内外摩擦区各自的范围，对比分析了原车刀和微槽车刀的刀—屑接触界面摩擦状态，从而获得两车刀相应的摩擦模型。研究发现：微槽的置入使得刀—屑粘结摩擦区长度缩短，带来的直接影响便是第二变形区内的主要发热区缩小，进而发热量也相应减小。研究结果为金属切削过程刀—屑接触摩擦模型研究提供一定理论参考。
关键词：硬质合金；微槽车刀；刀—屑接触界面；摩擦模型；有限元分析
中图分类号：TG712；TH111文献标志码：A
Study on Friction Model of Toolchip Interface of Cemented Carbide Micro Groove
Turning Tool Based on Finite Element Method
Jiang Hongwan，Yuan Sen，Chen Haihong，Ren Zhongwei，Zhan Gang
Abstract:The stress and strain of the toolchip contacting interface has an important influence on the metal cutting process，especially for the study of the friction and wear of tools，and he friction model is the mathematical expression of the stress and strain in the region. Based on the finite element simulation platform，this paper focuses on the friction state of toolchip contacting interface during cutting process of micro grooved turning tool，and determines the total length of toolchip contact region and the range of internal and external friction region.The friction states of the toolchip contacting interface of the original turning tool and the microgroove turning tool are compared and analyzed，thus the corresponding friction models of the two turning tool are obtained.Research results showed that the insertion of the microgroove makes the length of the bond friction zone of toolchip contacting interface be shortened，and the direct effect is that the main heating area in the second deformed regionis reduced，and then the calorific value is accordingly reduced.The research results provide some theoretical reference for the study on the friction model of toolchip contacting interface in the metal cutting process.
Keywords:cemented carbide；micro groove turning tool；toolchip contacting interface；friction model；finite element analysis