MANUFACTURE OF SKIN FILM FOR PREVENTING BURNING ON TITANIUM OR TITANIUM ALLOY MATERIAL AND SCREW TOOL AND SCREW TOOL WITH EXCELLENT CORROSION RESISTANCE, HEAT RESISTANCE, LIGHT, HIGH STRENGTH, AND GLOSSINESS

摘要

PURPOSE:To completely prevent the blank material from burning with the dies on the cold forging time by generating the oxidized layer with heating to the specific temperature on the former process of the work for drawing titanium material and making the oxidized skin as the carrier of the lubricant. CONSTITUTION:Titanium or the titanium alloy material is heated to the temperature 550-750 deg.C on the former process of the working for drawing. Then, the oxidized layer is generated and the workability is made good, and further, its oxidized skin is made as the carrier of the lubricant. The semifinished products of the screw tool is manufacture by using this wire material with the cold forging. The oxidized skin is removed before roll forming for screw. Therefore, the rework for defective goods after working or the selection is made needless.