变摩擦控制厚度分布的TC4深筒形件正反向超塑成形  

Friction Changing to Control Thickness Distribution of TC4 Deep Cylinder by Direct-Reverse Superplastic Forming

作　　者：蒋少松[1] 张凯锋[1] 吴海峰[2] 许沂[2] 雷鹍[2] 王斌[2] 

机构地区：[1]哈尔滨工业大学材料科学与工程学院,哈尔滨150001 [2]航天特种材料及工艺技术研究所,北京100074

出　　处：《航空材料学报》2008年第6期16-22,共7页Journal of Aeronautical Materials

摘　　要：以正反向超塑成形厚度均匀的TC4钛合金深筒形件为背景，采用MARC有限元模拟分析了正反向超塑成形时预成形模和终成形模的表面摩擦系数对成形件壁厚分布的影响。结果表明：合理地增大预成形模的表面摩擦力能显著增加预成形的局部减薄作用，对于提高零件最终壁厚分布均匀性有利。同时，合理减小终成形模的摩擦力，可以使板料整体变形均匀化，壁厚分布趋于均匀。根据模拟结果，采用机械加工方法增加预成形模表面粗糙度以增大摩擦力，在终成形模表面喷涂润滑剂以降低摩擦力，通过正反向超塑成形实验制得厚度分布在1．50～1．78mm范围内的航天用TC4钛合金深筒形件，比普通正反向超塑成形件厚度分布（1．18～2．24mm）有了很大改善。Based on the direct-reverse superplastic forming TC4 deep cylinder, the influence to final thickness distribution of surface friction of preforming die and forming die was analysed with MSC. MARC. The results show that higher friction coefficient of preforming die can efficiently reduce the thickness of the regions which need to be thinned, resulting in a more uniform final thickness distribution along the component. Lower friction coefficient of forming die can make the sheet tend to integral formation, also resulting in uniform thickness distribution. According to the results of the simulation, the friction of preforming die was increased by machining and the friction of forming die was decreased by spraying lubricant. The aerospace TC4 deep cylinder with uniform thickness （1.50 -1.78mm） was fabricated by direct-reverse superplastic forming experiment, compared to the thickness distribution（ 1.18 -2. 24mm） of common direct-reverse superplastic forming, the friction modifying direct-reverse superplastic forming was more efficient to form the uniform thickness components.

关 键 词：TC4钛合金 正反向超塑成形 厚度分布 摩擦 有限元模拟 

分 类 号：TG146[一般工业技术—材料科学与工程]