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1、放電加工表面合金化,報告人：李健誌指導老師：戴子堯2007/06/05,1,大綱,前言實驗方法與結果結論,2,前言,再鑄層熔融組織、痘瘡與淺坑、球狀附著物、窩孔、積碳、氣孔與裂紋。目前文獻方法能減少上述問題，但非全面性。實驗目的線放電加工Ti合金其表面合金化的影響。比較合金化後的表面粗糙度以及摩擦力。,3,實驗方法與結果,田口方法,4,Table 1 Fixed and variable parameters used for EDWM of Ti alloys,5,Table 2L8 orthogonal array used for EDWM of Ti alloys,6,Fig 1.Mi
2、crostructures following EDWM:(a)Ti-6Al-4V and(b)-TiAl workpieces,7,Fig 2.Close-up microcracks in-TiAl workpiece following EDWM,Fig 3.Workpiece microhardness(10m form surface)following EDWM,8,Fig 4.main effect plots and ANOVA for:(a,b)Ti-6Al-4V and(c,d)-TiAl,9,Table 3.Steel workpiece samples used for
3、 wear/tribology assessment,Fig 5.Micrograph of EDT/alloyed layer,Fig 6.Micrograph of Cr-plated EDT surface,10,Fig 7.Scratch test results for roll samples textured/alloyed with partially sintered WC/Co electrodes(Sample A)and textured with graphite electrodes(Sample B):(a)unidirectional and(b)bi-dire
4、ctional tests.,Fig 8.Unidirectional scratch test results for roll specimens:(a)textured/alloyed with WC/Co partially sintered electrodes(Sample A)and textured with graphite tool electrodes and Cr-plated(Sample C),11,結論,線放電加工過後的再鑄層厚度為1m至136 m，硬度為50HK0.025至900HK0.025。幾乎過半測試結果皆小於母材硬度。,12,結論,使用WC/Co電極所形
5、成的表面硬度為最高(超過900HK0.025)，且摩擦係數減少50%。使用習用電極加工，在表面鍍上一層Cr，摩擦力比WC/Co電極所形成的表面少30%。,13,Thanks for your attention,14,15,Electrical discharge surface alloyingH.G.Lee a,J.Simao a,D.K.Aspinwall a,R.C.Dewesa,W.Voice ba Department of Mechanical Engineering,School of Engineering,University of Birmingham,Edgbaston,Birmingham B15 2TT,UKb Rolls-Royce plc,P.O.Box 31,Derby DE24 8BJ,UKAccepted 6 November 2003,
