纳米硬质合金刀具切削Al/SiC_p复合材料的实验  

Experiments of cutting Al/SiC_p composite with nano cemented carbide tool

作　　者：郐吉才[1] 张飞虎[2] 

机构地区：[1]河南理工大学机械与动力工程学院,河南焦作454000 [2]哈尔滨工业大学机电学院,黑龙江哈尔滨150001

出　　处：《光学精密工程》2010年第2期406-411,共6页Optics and Precision Engineering

基　　金：河南理工大学博士基金资助项目

摘　　要：针对SiC颗粒硬度高,切削Al/SiCp复合材料时刀具磨损剧烈,本文提出用具有较高硬度、韧性及良好抗磨损能力的WC-7Co制备纳米硬质合金刀具,并对Al/SiCp复合材料进行了切削实验。研究了纳米硬质合金刀具磨损机理和Al/SiCp复合材料的切屑去除机理,以及刀尖处后刀面磨损值。研究认为,纳米硬质合金刀具磨损的机理为SiC颗粒的微切削作用引起的磨料磨损,及SiC颗粒对刀尖刃口的高频、断续冲击引起的微崩刃及微破损;Al/SiCp复合材料的切削实质是断续切削;去除机理为切屑的崩碎去除;纳米硬质合金后刀面磨损值较普通硬质合金小30%～50%。实验表明,纳米硬质合金较普通硬质合金更适于加工Al/SiCp复合材料。The tool can be worn seriously when Al/SiCp composite is machined due to the SiC particles with a higher hardness. Based on the new nano-cemented carbide characterized by his high hardness, toughness, flexural strength and higher wear resisting property,a WC-7Co nano cemented carbide tool was prepared, and the cutting experiment was carried out. The wear mechanism of nano cemented carbide tool and chip removal mechanism were studied. Results show that the wear mechanism of nano cemented carbide tool is an abrasion wear due to the micro-cutting of SiC particles and the micro-chipping and micro-breakage of cutting edge caused by interrupted impact of the SiC particles under the high frequency. The essence of cutting Al/SiCp is interrupted cutting,and the Al/SiCp chip removal is the breakout of chip. Experiment indicates that the flank wear value of nano cemented carbide tool is about 30X-50% less than that of common cemented carbide, which means nano cemented carbide is more suitable for machining Al/SiCp composite than common cemented carbides.

关 键 词：纳米硬质合金 AL/SICP 复合材料 磨损机理 断续切削 

分 类 号：TG729[金属学及工艺—刀具与模具] TG506.7