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

钛合金不仅具有优异的耐腐蚀性，而且具有高强度。采用冷拉深成形β类钛合金板材。虽然钛合金一般在高温下加工，但β类型的钛合金板材具有很高的冷加工性能。对钛合金板材进行加热氧化物涂层处理，以防止拉深过程中的卡箍。由于氧化层的存在，新鲜干净的钛在成形过程中不会与模具直接接触，因此氧化物涂层在防止卡箍和刮伤的发生方面是有效的。加热后延性也得到了改善。在不进行中间退火的情况下，成功地成形了钛合金长杯形件。通过对板材进行拉深和细化处理，提高了拉伸杯形件的表面粗糙度。

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.