Ti-6Al-4V硬质合金立铣刀的几何参数优化仿真研究

2019-07-30

作者：齐彪，吴春亚，陈明君，刘启单位：哈尔滨工业大学

摘要：Ti-6Al-4V属于难加工材料，具有热导率低、加工硬化现象严重和弹性模量低等特点，而硬质合金刀具对该材料具有较好的加工性能。刀具的几何参数对刀具上的应力、切削力、切削温度和加工表面质量有重要影响，故可以通过优化刀具几何参数来获得刀具的最优切削性能。建立三维铣削有限元模型，经过切削仿真试验分析硬质合金平头立铣刀的螺旋角、径向前角及径向后角对切削过程中的最大正应力、切削力及切削温度的影响，实现刀具几何参数的优化设计。

关键词：刀具几何参数；P-V值；最大正应力；切削力；切削温度

中图分类号：TG714；TH162文献标志码：ADOI：10.3969/j.issn.1000-7008.2019.08.006

Optimization of Tool Geometries of Tungsten Carbide End Mill for

Machining Ti6Al4V Through FEM Simulation

Qi Biao，Wu Chunya，Chen Mingjun，Liu Qi

Abstract:Ti6Al4V is one kind of difficulttomachine materials due to its characteristics of poor thermal conductivity，serious work hardening，low elastic modulus.In general tungsten carbide tools have good processing properties for this material.Tool geometry has an important influence on the cutting stress，cutting force，cutting temperature and the machined surface quality.Optimizing tool geometries is an effective method to achieve the optimal cutting performance.A threedimensional milling finite element model is established，which are employed to analysis the influence of helical angle，radial rake angle and radial relief angle of the tungsten carbide flat end mill on max principal stress，cutting force and cutting temperature，and the optimal design of tool geometries is realized.

Keywords:tool geometry；PV value；max principal stress；cutting force；cutting temperature