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BOLT MADE OF TITANIUM ALLOY AND METHOD FOR PRODUCING BOLT MADE OF TITANIUM ALLOY HAVING TENSILE STRENGTH OF AT LEAST 800 MPa
BOLT MADE OF TITANIUM ALLOY AND METHOD FOR PRODUCING BOLT MADE OF TITANIUM ALLOY HAVING TENSILE STRENGTH OF AT LEAST 800 MPa
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机译:钛合金螺栓强度至少达到800 MPa的钛合金螺栓制造方法
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摘要
PROBLEM TO BE SOLVED: To provide a bolt made of a titanium alloy which can be subjected to cold forging and is inexpensive, and to provide a method for producing the same.;SOLUTION: In the figure (a), a stock piece 20 is composed of a Ti-Fe-O based alloy comprising, by mass, 0.6 to 1.4% Fe and 0.24 to 0.44% O, and the balance titanium with inevitable impurities. In the stock piece 20, the diameter of the part to form into a shaft part is reduced by drawing. In the figure (b), the drawn part 21 is subjected to head upset forging, thus a large-diameter part 22 is made into a bolt head. The figure (c) shows the obtained headed shaft member 25, and, in the headed shaft member 25, one end of the shaft part 23 is integrally provided with a bolt head 26 fitted with a flange 27. Since this invention is composed of the Ti-Fe-O based alloy, cold plastic working is made possible, working cost can be reduced, and stock cost can be reduced.;COPYRIGHT: (C)2007,JPO&INPIT
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