功能电极烧蚀加工典型难加工材料实验研究  

Experimental Study on Function Electrode Ablation Machining of Difficult-to-Machine Materials

作　　者：徐安阳[1] 刘志东[1] 李文沛[1] 邱明波[1] 田宗军[1] 

机构地区：[1]南京航空航天大学机电学院,南京210016

出　　处：《南京航空航天大学学报》2014年第5期763-768,共6页Journal of Nanjing University of Aeronautics & Astronautics

基　　金：国家自然科学基金(51175256;51205197)资助项目;航空基金(2011ZE52060)资助项目;江苏省自然科学基金(BK2011732)资助项目;江苏省普通高校研究生科研创新计划(CXLX12_0138)资助项目;中央高校基本科研业务费专项资金资助项目

摘　　要：为研究功能电极电火花诱导烧蚀加工对难加工材料的适用性和影响因素,选取镍基高温合金GH4169、淬火模具钢Cr12、钛合金TC4、钛铝合金TAC-2四种典型难加工材料进行常规电火花加工(Electric discharge machining,EDM)和功能电极烧蚀加工对比实验。结果表明:烧蚀加工对难加工材料有广泛的适用性,其加工效率分别为相同条件下常规电火花加工的37.3倍、13.5倍、58.7倍和13.7倍。研究发现:随着金属活泼性的提高,燃烧消耗和燃烧热的熔化作用增强,烧蚀作用增大;烧蚀加工表面的氧化层特性对烧蚀加工效率的提高有决定性作用;内喷液加工反镀现象的减小、烧蚀加工效率的提高量、氧化层的特性等因素决定着电极的相对损耗。In order to study the processing adaptability and influencing factors of discharge-induced combustion with function electrode for difficult-to-machine materials,contrast experiments between conventional electric discharge machining （EDM） with cylindrical electrode and combustion machining with function electrode are carried out.Four typical difficult-to-machine materials,i.e.nickel-base superalloy GH4169,die steel Cr12,titanium alloy TC4 and titanium-aluminum alloy TAC-2 are selected in the contrast experiments.The results show that the efficiencies of combustion machining for GH4169 is 112 mm^3/min,for Cr12 is 92.28 mm^3/min,for TC4 is 347.7 mm^3/min and for TAC-2 is 152.5 mm^3/ min,which are 37.3,13.5,58.7,13.7 times than those of conventional EDM respectively under the same conditions.With the augmentation of metal activity,the burning intensity and combustion hot melting increase and the combustion effect also becomes more apparent.The characteristics of oxidation layer covering on machining surface plays a significant role in improving alloy material processing efficiency.Some factors determine the relative wear of the electrode,which include the weakened phenomenon on anti-plating of inner ejection liquid,the improvement of ablation processing efficiency,the characteristic of the oxide layer,etc.

关 键 词：烧蚀加工 功能电极 难加工材料 金属活泼性 氧化层 

分 类 号：TG662[金属学及工艺—金属切削加工及机床]