基于速度效应的高温合金高速超高速磨削成屑过程及磨削力研究  

Investigations of the “Speed Effect” on Critical Thickness of Chip Formation and Grinding Force in High Speed and Ultra-high Speed Grinding of Superalloy

作　　者：田霖[1] 傅玉灿[1] 杨路[1] 徐九华[1] 李海燕[2,3] 丁文锋[1] 

机构地区：[1]南京航空航天大学机电学院,南京210016 [2]中航工业金城南京机电液压工程研究中心,南京211106 [3]中航工业航空机电系统综合航空科技重点实验室,南京211106

出　　处：《机械工程学报》2013年第9期169-177,共9页Journal of Mechanical Engineering

基　　金：国家自然科学基金重点项目(51235004);江苏省自然科学基金(BK2010496);江苏省普通高校研究生科研创新计划中央高校基本科研业务费专项资金;CX10B_091Z)资助项目

摘　　要：为探索砂轮线速度的提高对高强韧难加工材料成屑过程的影响规律,选择典型难加工材料高温合金GH4169,对其进行单颗磨粒高速超高速磨削试验,测量单颗磨削力,并通过观察分析单颗磨粒划擦痕迹以确定不同线速度条件下的临界成屑厚度,系统研究砂轮线速度在20～165 m/s范围内,磨削成屑过程与磨削力随速度变化的规律。研究结果表明,速度效应引起磨削过程阶段划分及临界成屑厚度的转变;同时,磨削力随着砂轮线速度的上升呈先增加后减小再增大的趋势,这些现象均表明速度效应使得难加工材料加工性发生转变,该转变是通过材料应变率强化与热软化两效应主导地位的转变而引起的。随着砂轮线速度的上升,高温合金材料单颗磨屑锯齿化程度加剧,且磨痕沟槽两侧隆起高度呈先减小后增大趋势,这些现象进一步说明速度效应导致材料成屑机制的转变。In order to investigate the influence law of chip formation process affected by grinding speed, the single-grain tests are carried out on the difficult to cut materials superalloy GH4169. The single-grain grinding forces are measured. The trances and chips morphologys of the single-grain grinding tests are observed and analyzed to calculate the critical thickness of chips formation. The speed effect on the grinding process scratches and grinding forces are studied systematically in the grinding wheel velocity range 20 m/s to 165 m/s. The results show that the grinding speed affects the division of grinding process and the critical thickness of chip formation, and the single-grain grinding forces first increase then decrease and increase finally with the increasing grinding velocity. Machinability Changes due to the speed effect, and these changes caused by the alternative variation of the leading position between the strain rate strengthening effects and the thermal softening effects on the difficult to cut materials. Serrated chip occurs during single-grain grinding superalloy, as the grinding speed increases, the grade of serrated tooth grows and the pile up rate of the single-grain grinding grooves decrease first then increases, these phenomenon indicated that mechanism of chip formation due to the speed effect.

关 键 词：速度效应 临界成屑厚度 磨削力 高速超高速磨削 

分 类 号：TG580[金属学及工艺—金属切削加工及机床]