高温合金高速铣削表面形貌及组织研究  

Study on High-speed Milling Surface Microstructure of Superalloy

作　　者：杜随更[1] 汪志斌[1] 吕超[2] 巨江涛[1] 张静[1] 

机构地区：[1]西北工业大学现代设计与集成制造技术教育部重点实验室,陕西西安710072 [2]中国飞行试验研究院,陕西西安710089

出　　处：《航空学报》2011年第6期1156-1163,共8页Acta Aeronautica et Astronautica Sinica

基　　金：国家"973"计划(6138502)~~

摘　　要：为研究高温合金GH4169高速铣削表面完整性,在测量铣削过程中切削力随时间及切削参数变化规律的基础上,分析了高温合金加工表面形貌及微观组织的演化规律。结果表明:在本试验参数范围内,切削力随着切削速度的增加先升高后降低;铣削表面粗糙度随着切削速度增加而下降,随每齿进给量的增加而增加;变质层主要出现在主切削刃形成的切削表面上,在副切削刃形成的切削表面上几乎观察不到变质层;变质层厚度随瞬时接触角变化,当瞬时接触角为120°时变质层厚度最大;变质层厚度随切削速度升高呈山峰状变化,端铣及侧铣变质层厚度最大时,对应的切削速度分别为75.4m/min及150.7m/min左右。分析认为垂直切削力是引起变质层厚度变化的主要力学因素,切削过程的热力耦合作用是影响变质层的根本原因。In order to study the surface integrity of superalloy GH4169 under high-speed milling, the rules governing the cutting surface morphology and microstructure of the superalloy are analyzed on the basis of the measurments of the variation of milling forces with the changes of the processing parameters and time during high-speed milling. The results indicate that in the range of the experimental parameters, the forces have a trend of first rising and then falling, and that they reach the peak when the cutting speed of end milling is 75.4 m/min. The surface roughness decreases with increasing cutting speed, but increases with increasing feed. Under the conditions of the experiment, a metamorphic layer appears at the milling surface generated by the major cutting edge, but the layer is hardly observed at the surface generated by vice cutting edge. The thickness of the metamorphic layer changes as the contact angle changes, and the thickest metamorphic layer is observed where the contact angle is about 120°. The thickness of the metamorphic layer has a trend of first rise and then fall as the cutting speed increases. The thickest metamorphic layer of end milling appears when the cutting speed is about 75.4 m/min, which is about 150.7 m/min of side milling. It is suggested that the thrust force plays the main mechanical role of forming the metamorphic layer, and that the coupled thermo-mechanical action during high-speed milling is the basic cause that generates the metamorphic layer.

关 键 词：高温合金 高速铣削 表层组织 表面完整性 表面形貌 

分 类 号：V261.23[航空宇航科学与技术—航空宇航制造工程] TG54[金属学及工艺—金属切削加工及机床]