定向内冷车刀及其切削性能

摘要/Abstract

摘要： 针对镍基高温合金切削过程中存在的过热烧伤问题，提出采用定向内冷切削方法提高冷却液在切削区的换热效率。采用FLUENT软件建立定向内冷车刀的流场与温度场模型，分析微流道结构对刀具换热性能的影响，对刀具微流道结构进行设计，研制了定向内冷式切削系统。采用相同的切削加工参数，在干切削、外部浇注切削和定向内冷切削三种冷却环境下进行镍基高温合金切削对比试验，分析了冷却方式对切削力、切削温度、加工表面粗糙度和表面微观形貌的影响规律，结果表明：定向内冷方法可有效减小切削力并降低切削温度，获得表面粗糙度更小、纹理更为规整的加工表面。

关键词: 内冷却, 高温合金, 切削温度, 加工表面质量

Abstract: In view of surface burns in cutting of nickel-based superalloy, the directional internal-cooling cutting methods were proposed to improve the cooling effects of cutting fluid in cutting areas. The flow and temperature field model of the directional internal-cooling tool were established by FLUENT software, and the effects of micro-channel structures on heat transfer ability of the tool were studied. Based on the simulation results, the micro-channel structures were designed, and the directional internal-cooling cutting systems were developed. Cutting experiments of nickel-based superalloy with different cooling methods, i.e. dry, flood cooling and directional internal-cooling, were carried out under same cutting parameters. The influences of cooling methods on cutting force, cutting temperature, surface roughness and surface topography were studied respectively. The results show that the internal-cooling method may effectively reduce the cutting force and cutting temperature. Under directional internal-cooling conditions, lower surface roughness and more favorable surface topography with regular textures are obtained.

Key words: internal-cooling, superalloy, cutting temperature, machined surface quality

中图分类号:

TH16

彭锐涛1;降皓鉴1;唐新姿1;张珊2. 定向内冷车刀及其切削性能[J]. 中国机械工程.

PENG Ruitao1;JIANG Haojian1;TANG Xinzi1;ZHANG Shan2. Directional Internal-cooling Tools and Their Machining Performances[J]. China Mechanical Engineering.

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