基于有限元理论分析切削振动对CBN刀具磨损的影响

研究用CBN刀具切削钛合金Ti-6Al-4V材料时,切削振动对刀具磨损的影响情况。用有限元分析技术,设计正交试验,分析不同方向切削振动幅度和振动频率对刀具表面应力、刀具温度的影响,研究切削振动条件下的刀具磨损情况。有限元仿真结果表明:X方向振动对刀具表面应力和温度影响较小,且规律性影响不明显,因此X方向振动并未加重刀具磨损;Y方向振动对刀具表面应力和温度影响较大,刀具表面应力和温度随着Y方向振动幅度和频率增加而增大和升高,刀具磨损加重;当X方向和Y方向均存在振动时,刀具表面应力和温度也随着振动幅度和频率增加而增大和升高,刀具磨损严重。利用实际切削试验对有限元分析结果进行验证,发现振动对刀具磨损影响较大,与有限元分析结果基本一致。 

Study on influence of cutting vibration on CBN tool wear based on finite element theory

The effect of cutting vibration on tool wear in cutting titanium alloy Ti-6Al-4V with CBN tool was studied.By using finite element analysis technology,orthogonal experiments were designed to analyze the effects of vibration amplitudes and frequencies in different directions on tool surface stress and tool temperature,so as to study tool wear under cutting vibration conditions.The results of finite element simulation showed that the influence of X-direction vibration on the stress and temperature of the tool surface was limited.There was no obvious regularity.The wear of the tool was not aggravated by X-direction vibration condition.The influence of Y-direction vibration on the stress and temperature of the tool surface was greater.The stress and temperature of the tool surface increased with the vibration amplitude and frequency in Y-direction.When the vibration occurred in both X and Y directions,the stress and temperature on the tool surface increased with the increase of vibration amplitude and frequency,which was characterized by severe tool wear.Cutting experiment was carried out.It was found that the vibration had a great influence on the tool wear,which was basically consistent with the results of the finite element analysis.