TC4钛合金锥形件叠层超塑成形工艺研究  

Laminated-layer Superplastic Forming Process Research of TC4 Titanium Alloy Conical Parts

作　　者：刘胜京[1] 张军 雷海龙[1] 陈福龙[1] 孟庆磊[1] 

机构地区：[1]北京航空制造工程研究所,北京100024 [2]空军驻北京地区军事代表室,北京100024

出　　处：《热加工工艺》2014年第17期155-159,164,共6页Hot Working Technology

摘　　要：为了提高锥形件超塑成形效率,提出了叠层超塑成形工艺及高温进出炉成形方案,并采用正反向超塑成形方法以提高壁厚分布均匀性。通过对超塑成形过程自由胀形阶段与贴模成形阶段进行的力学解析,得到了最佳等效应变速率条件下的气压加载曲线。以此为基础,对单层正向成形、单层正反向成形及双层正反向成形进行了920℃超塑成形实验研究。结果表明,正反向成形可显著改善锥形件壁厚均匀性。在双层正反向成形条件下,锥形件最大截面圆度为0.05 mm,最小壁厚为1.01 mm,型面尺寸及壁厚分布均满足使用要求,下层零件的壁厚均匀性较差。叠层超塑成形工艺及900℃装出炉方案可行有效,可使锥形件超塑成形效率提高1倍以上。To improve the superplastic forming （SPF） efficiency of conical parts, the laminated-layer SPF process and theforming scheme of an entering and leaving furnace at high temperature were proposed. And the direct-reverse SPF methodwas adopted to improve the wall thickness distribution uniformity. Through the mechanics analysis of free bulging stage andfilling die forming stage, the pressure loading curve for optimum equivalent strain rate was obtained. On the basis of this, theSPF experimental researches of single direct forming, single direct-reverse forming and double direct-reverse forming at 920℃ were carried out. The results show that, direct-reverse forming can significantly improve the wall thickness uniformity ofconical parts. On the condition of double direct and reverse forming, the maximum section roundness of conical parts is0.05mm and minimum wall thickness is 1.01mm. Surface size and wall thickness distribution can satisfy the usingrequirement, and the wall thickness uniformity of lower part is poor. Laminated SPF process and the forming scheme of theentering and leaving furnace at 900℃ is feasible and effective, which can improve the SPF efficiency for conical parts by morethan one time.

关 键 词：叠层超塑成形 TC4钛合金 锥形件 正反向超塑成形 壁厚分布 

分 类 号：TG306[金属学及工艺—金属压力加工]