Research of Multi-Stage Cold Deep Drawing Technique of Long Pure Titanium Cups

为防止癫痫发作，采用商用有色钛板，经多段冷深拉成型纯钛长杯。钛板具有足够的延展性和较高的r值，适合拉深，但由于与模具材料的高反应性，在拉深过程中容易发生卡扣。对有色纯钛片进行电化学镀膜处理，得到有效防止卡壳的氧化表面层。采用商用彩色板材，可以避免钣金成形厂家涂布机的投资，控制氧化层的质量。研究了氧化层厚度、模具材料和润滑剂对多段拉深卡扣的影响。结果表明，彩色纯钛板在多段拉深过程中具有足够的防检出能力。

Long pure titanium cups were formed by multi-stage cold deep drawing using commercial colored titanium sheets for preventing seizure. The titanium sheets have sufficient ductility and high r-value for the deep drawing, whereas the seizure tends to occur during the deep drawing due to high reactivity with die materials. The colored pure titanium sheets were treated by electrochemical coating so as to get oxide surface layer effective for preventing the seizing. By the use of commercial colored sheets, the investment of coating machines can be avoided in sheet metal forming makers and the quality of the oxide layer can be controlled. The effects of the thickness of the oxide layer, die materials and lubricants on the occurrence of seizure in multi-stage deep drawing were examined. It was found that the coloured pure titanium sheets have sufficient ability in preventing the seizure in multi-stage deep drawing processes.