An investigation into superficial embedment in mirror-like machining using abrasive jet polishing

NCUIR > Engineering College > Graduate Institute of Mechanical Engineering > journal & Dissertation > Item 987654321/26832

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/26832

Title:	An investigation into superficial embedment in mirror-like machining using abrasive jet polishing
Authors:	Tsai,FC;Yan,BH;Kuan,CY;Hsu,RT;Hung,JC
Contributors:	機械工程研究所
Keywords:	EDM;POWDER;SILICON
Date:	2009
Issue Date:	2010-06-29 18:01:17 (UTC+8)
Publisher:	中央大學
Abstract:	This study performs experimental investigation into the application of abrasive jet polishing (AJP) to the surface finishing of electrical-discharge-machined SKD61 mold steel workpieces. The results indicate that the AJP processing conditions which optimize the surface quality of the SKD61 workpiece when polishing using #2000SiC abrasives are as follows: an abrasive material to additive ratio of 1:2, an impact angle of 30A degrees, a gas pressure of 4 kg/cm(2) (0.4 MPa), a nozzle-to-workpiece height of 10 mm, a platform rotational velocity of 200 rpm, and a platform travel speed of 150 mm/s. Under these processing conditions, a polishing time of 20 min is sufficient to reduce the surface roughness from an initial value of Ra = 1.7 mu m to a final value of Ra = 0.27 mu m, corresponding to an improvement of 84.12%. The experimental results demonstrate that the maximum attainable improvement in the surface quality of the polished workpiece is limited by a surface-hardening effect caused by the ball-impact phenomenon and the embedment of #2000SiC fragments in the workpiece surface.
Relation:	INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
Appears in Collections:	[Graduate Institute of Mechanical Engineering] journal & Dissertation

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