【摘要】 高温合金广泛应用于航空航天等领域,是一种典型的难加工材料。PCBN是一种超硬刀具材料,在加工高温合金时性能优异,但切削过程中存在刀具磨损和破损严重等现象。高压冷却是一种新的冷却方式,能够有效减小机械冲击,并影响刀具应力分布,因此研究高压冷却下的刀具应力分布具有重要意义。首先建立高压冷却下刀具应力模型,为高压冷却下刀具应力变化规律提供理论基础;其次采用有限元方法,对不同冷却条件、切削用量和冷却压力的刀具应力分布进行仿真结果分析,获得不同切削条件对刀具应力的影响规律;最后进行高压冷却试验,分析切削力、刀具应力分布及刀具破损变化规律,为高压冷却下高效加工高温合金和刀具优化等提供一定的技术基础。更多还原

【Abstract】 Superalloys are widely used in aerospace and other fields, and are a kind of typical difficult-to-cut material. PCBN is a kind of superhard tool material, which has excellent performance in processing superalloys, but there are some phenomenon such as tool wear and serious damage in cutting process. High-pressure cooling is a new cooling method, which can effectively reduce the mechanical impact and affect the stress distribution of cutting tools. Therefore, it is important to study the stress distribution of cutting tools under high-pressure cooling. Firstly, tool stress model under high-pressure cooling is established to provide theoretical basis for tool stress variation law under high-pressure cooling; Secondly, the finite element method is used to simulate the stress distribution of cutting tools under different cooling conditions, cutting parameters and cooling pressures, and the influence law of different cutting conditions on the stress of cutting tools is obtained; Finally, the high-pressure cooling test is carried out to analyze the cutting force, stress distribution of tool and tool breakage, which provides a certain technical basis for efficient processing of superalloys and tool optimization under high-pressure cooling.更多还原