放电加工表面合金化课件.ppt

1、放電加工表面合金化報告人 ：李健誌指導老師：戴子堯2007/06/051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4Table 1 Fixed and variable parameters used for EDWM of Ti alloys5Table 2L8 orthogonal array used for EDWM of Ti alloys6Fig 1.Microstruct

2、ures following EDWM:(a)Ti-6Al-4V and(b)-TiAl workpieces7Fig 2.Close-up microcracks in-TiAl workpiece following EDWMFig 3.Workpiece microhardness(10m form surface)following EDWM8Fig 4.main effect plots and ANOVA for:(a,b)Ti-6Al-4V and(c,d)-TiAl9Table 3.Steel workpiece samples used for wear/tribology

3、assessmentFig 5.Micrograph of EDT/alloyed layerFig 6.Micrograph of Cr-plated EDT surface10Fig 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-directional tests.Fig 8.

4、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電極所形成的表面硬度為最高(超過900HK0.025)，且

5、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%。13Thanks for your attention1415Electrical 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