Study on surface integrity enhancement of titanium alloy milling with ball end mill by micro-texture

The surface integrity of machined workpiece is an important index to evaluate the service performance of parts. In order to improve the service performance and machining efficiency of titanium alloy, the concept of variable distribution density micro-textured ball end milling cutter is proposed based on texture effect. Firstly, based on the ball end milling model of titanium alloy, a variable density micro-texture model is established in the chip contact region. Secondly, a milling titanium alloy test platform was built to reveal the change law and mechanism of micro-texture parameters on the machined surface integrity. Finally, based on the hierarchical structure weight method and fuzzy comprehensive evaluation theory, the integrity of the machined surface is comprehensively evaluated and the micro-texture parameters are optimized. The results show that the variable distribution density micro-texture has a positive effect on improving the machining quality of titanium alloy. The micro-texture in the bonding zone can reduce the tool-chip contact area, improve the friction state, increase the heat dissipation area, and reduce the plastic deformation of titanium alloy. The micro-texture in the slip zone can improve the chip curl and promote the stability of the system. In addition, reasonable micro-texture parameters can obtain better surface quality of the workpiece.

Automated summary

This article proposes the concept of a variable distribution density micro-textured ball end milling cutter based on texture effect to improve the service performance and machining efficiency of titanium alloy. Firstly, a variable density micro-texture model is established in the chip contact region of titanium alloy ball end milling. Secondly, a milling titanium alloy test platform is built to reveal the change law and mechanism of micro-texture parameters on the machined surface integrity. Finally, the integrity of the machined surface is comprehensively evaluated and the micro-texture parameters are optimized using the hierarchical structure weight method and fuzzy comprehensive evaluation theory. The experimental results show that the variable distribution density micro-texture has a positive effect on improving the machining quality of titanium alloy.