硬质合金直接微铣削的实验研究

Experimental Investigation on Direct Micro Milling of Cemented Carbide.

作者信息

Wu Xian, Li Liang, He Ning, Zhao Guolong, Shen Jianyun

机构信息

College of Mechanical Engineering and Automation, Huaqiao University, Xiamen 361021, China.

College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China.

出版信息

Micromachines (Basel). 2019 Feb 22;10(2):147. doi: 10.3390/mi10020147.

DOI:10.3390/mi10020147

PMID:30813285

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6412777/

Abstract

Cemented carbide is currently used for various precise molds and wear resistant parts. However, the machining of cemented carbide still is a difficult challenge due to its superior mechanical properties. In this paper, an experimental study was conducted on direct micro milling of cemented carbide with a polycrystalline diamond (PCD) micro end mill. The cutting force characteristics, surface formation, and tool wear mechanisms were systematically investigated. Experimental results show that cemented carbide can be removed with ductile cutting utilizing the PCD tool with a large tool tip radius. Micro burrs, brittle pits, and cracks are the observed surface damage mechanisms. The tool wear process presents microchipping on the cutting edge and exfoliating on the rake face in the early stage, and then severe abrasive and adhesive wear on the bottom face in the following stage.

摘要

硬质合金目前用于各种精密模具和耐磨部件。然而，由于其优异的机械性能，硬质合金的加工仍然是一项艰巨的挑战。本文采用聚晶金刚石（PCD）微型立铣刀对硬质合金进行了直接微铣削实验研究。系统地研究了切削力特性、表面形成和刀具磨损机制。实验结果表明，使用刀尖半径较大的PCD刀具可以实现硬质合金的延性切削。观察到的表面损伤机制有微毛刺、脆性凹坑和裂纹。刀具磨损过程在初期表现为切削刃微崩刃和前刀面剥落，随后在下一阶段表现为底面严重的磨料磨损和粘着磨损。