Study on Surface Properties of Aluminum - based Silicon Carbide Composites by Wire Cutting and Discharge Machining

• Main Authors: CHEN,JHIH-CING, 陳志清
• Other Authors: HUANG,LI-REN
• Format: Others
• Language: zh-TW
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/69q52g

碩士 === 中州科技大學 === 機械與自動化工程系 === 106 === The purpose of this study is to build machining data base of aluminum-metal matrix complex (AMMC), in order to replace traditional machining with non-traditional machining of EDWC. Three types of aluminum-metal matrix complexes were used to develop complex materials of the hardness via different contents of SiC percentage. Results showed that not only defects of materials casting plausibly was disadvantageous to mechanical properties of aluminum-metal matrix complexes but also led to wire-breakage as machining of EDWC. The effects of aluminum-metal matrix complexes on the characteristics of machinability of EDW as below: (1) With increasing on time of cutting conditions, the surface roughness of aluminum-metal matrix complexes increases. The EDW surface of aluminum-metal matrix complexes was rougher than that of as-cast A356.2 due to microstructure of SiC; (2) The factor's order of cutting feedrate for AMMC measured by simulated regression as followed: thickness of the workpiece, on time, feedrate override of the table, SiC contents; (3) In order to acquire the precision of workpieces by setting higher water flow rate, resistivity of dielectric fluid and wire tension prior to wire-breakage. The thickness and hardness distributions of remelted layer in cross-sectional area of EDW surface differed from that of EDM. The dimension of remelted layer of AMMC in cross-sectional area of EDW surface was not as the same as in terms of measuring instruments such as OM, Hv and SEM. Although there was the thinner distributions of AMMC than that of A356.2 due to microstructure of SiC changed the microstructure of remelted layer and mechanical properties.