Research of Multi-Stage Cold Deep Drawing Technique of Titanium Alloy Sheets

钛合金不仅具有优良的耐腐蚀性，而且强度高。采用冷深拉成型了一种β型钛合金板材。虽然钛合金一般在高温下加工，但β型钛合金薄板具有较高的冷加工性。对钛合金板材进行加热氧化涂层处理，防止在拉深过程中发生卡扣。氧化层的存在使新鲜干净的钛在成形过程中不会与模具直接接触，有效地防止了卡扣和磨损的发生。加热后的延展性也得到了改善。在没有中间退火的情况下，成功地成形了钛合金长杯。通过板料的熨烫和晶粒细化，提高了拉伸杯的表面粗糙度。

The titanium alloy has not only excellent corrosion resistance but also high strength. A β-type titanium alloy sheet is formed by cold deep drawing. Although titanium alloys are generally worked under an elevated temperature, the β-type titanium alloy sheet has high cold workability. The titanium alloy sheet is treated by heating oxide coatings to prevent the seizure during the deep drawing. The oxide coating is effective in preventing the occurrence of seizure and galling, because the fresh and clean titanium is not in direct contact with the die during the forming due to the existence of the oxide layer. The ductility was also improved by the heating. The long titanium alloy cup was successfully formed without intermediate annealing. The surface roughness of the drawn cup was improved by ironing and grain refinement of the sheet.