【作者】 董小磊；

【导师】 高国富；

【作者基本信息】 河南理工大学 ， 机械制造及其自动化， 2009， 硕士

【摘要】 碳化硅颗粒增强铝基复合材料复合材料(简称SiCp/Al复合材料)是一种新型复合材料,以其卓越的性能受到了世界各国的重视。但由于其内部具有较高硬度的增强相,使得其机械加工变得非常困难,现已成为阻碍其工业应用的瓶颈。为了解决SiCp/Al复合材料的难加工问题,本文将超声波振动加工引入普通铣削中,以期在保证优良表面质量的同时降低铣削温度,减少刀具磨损。本文以研究超声波铣削加工工艺为目的,设计了铣削SiCp/Al复合材料超声波振动加工系统和半人工热电偶测温装置,并利用Labview程序平台设计了测温程序;建立了超声振动切削温度场的传热模型和超声振动切削力的理论模型,并通过实验对理论模型进行了验证;利用自制的超声波铣削系统对加工过程中的切削温度的变化规律、切削力的变化规律状况进行了试验研究;最后通过工具显微镜,分析了SiCp的变形破坏方式、工件表面的微观结构和切削过程中的刀具磨损状态。结果表明:在相同切削参数下,超声铣削SiCp/Al复合材料时的切削温度要比普通铣削时低20～30°C,切削力要低30～40N;在铣削SiCp/Al复合材料时,刀具磨损主要是前刀面的颗粒磨损和后刀面的挤压磨损;利用超声波振动铣削可以提高工件表面质量,降低刀具磨损。更多还原

【Abstract】 SiC particle reinforced aluminum matrix composites (abbreviated SiCp/Al composites) is a new type of composite material, with its superior performance has been of great importance to all countries in the world. But the machining is very difficult due to the rigidity of its internal reinforced-phase, and it has become the bottleneck which restricts its industry application. In order to settle the difficult machining problem of SiCp/Al composites, ultrasonic vibration machining is introduced to common cutting in this thesis for the purpose of obtaining the fine surface quality as well as reducing cutting temperature and decrease tool wear.This paper focuses on studying the ultrasonic milling process for the purpose. The ultrasonic vibration milling device and semi-artificial thermocouple temperature measurement devices are developed. The procedure of the temperature measurement is designed by using Labview procedure. The heat diffusion model of ultrasonic cutting temperature field and Model of Ultrasonic Vibration Cutting are established, and the models of theoretical verified by experiments; Through the experiment the change law of the cutting force and cutting temperature are studied; Finally, the distortion damage mode of SiCp, Microstructure on surface of workpiece and the status of tool wear during the cutting are analyzed by Scanning Tool Microscope.The results of the experiment show that, in the same cutting parameters, the cutting temperature with the ultrasonic vibration cutting of SiCp/Al composites is lower 20～30oC than the ordinary cutting, and cutting force lower 30～40N; Tool wear in ultrasonic vibration cutting of SiCp/Al composites are mainly particle attrition of rake face and rear face of extrusion attrition; ultrasonic vibration cutting can decrease the tool wear and improve the quality of processing surface.更多还原