SiC_(p)/Al超声椭圆振动车削力热特性仿真研究

Simulation Study of Force and Thermal Characteristics on SiC_(p)/Al Ultrasonic Elliptical Vibration Turning

SiC_(p)/Al复合材料在航空航天、精密仪器等诸多领域发挥重要作用,但是其在加工中会出现较高的切削力和切削温度,从而降低其车削加工表面质量和精度。为探究超声椭圆振动作用及车削工艺参数对SiC_(p)/Al车削的影响,在ABAQUS中建立了SiC_(p)/Al超声椭圆振动有限元车削仿真模型,优化了SiC_(p)/Al微观几何建模方法,对车削模型进行验证并开展车削仿真试验研究。试验结果表明,超声椭圆振动车削可有效减少亚表面损伤、表面裂纹等缺陷。通过变切速和变切深单因素试验,发现随着切削速度和切削深度增加,普通和超声车削主切削力和切削温度均增大,超声椭圆振动技术可有效降低SiC_(p)/Al车削过程的主切削力和切削温度。在所选参数中,切深100μm、切速200mm/s时超声作用降低切削力作用最大;切深20μm、切速600 mm/s时超声作用降低切削温度作用最大。

SiC_(p)/Al composites play an important role in aerospace,precision instruments and other fields,however,higher cutting force and cutting temperature will appear in the machining process,thus reducing the surface quality and precision of the turning process.In order to explore the effect of ultrasonic elliptic vibration and turning technological parameters on SiC_(p)/Al turning,the SiC_(p)/Al ultrasonic elliptic vibration finite element turning simulation model was established in ABAQUS,the SiC_(p)/Al micro-geometric modeling method was optimized,the turning model was verified and the simulation experiment was carried out.The results show that the ultrasonic elliptic vibration turning can effectively reduce the defects such as subsurface damage and surface crack.It is found that with the increase of cutting speed and cutting depth,the main cutting force and cutting temperature of conventional and ultrasonic turning increase;The ultrasonic elliptical vibration technology can effectively reduce the main cutting force and cutting temperature in SiC_(p)/Al turning process.Among the selected parameters,the ultrasonic effect reduces the cutting force the most when the cutting depth is 100μm and the cutting speed is 200 mm/s;The ultrasonic effect reduces the cutting temperature the most when the cutting depth is 20μm and the cutting speed is 600 mm/s.