Method of straightening wire rods of titanium and titanium alloy
US6077369A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 19, 1997 |
| Grant date | Jun 20, 2000 |
| Priority date | — |
| Expiry date | Mar 19, 2017 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB23P15/002
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A method of straightening a wire rod of titanium or titanium alloy wherein the rod is hot-straightened to a straight rod at the straightening temperature T and elongation .epsilon. satisfying the expression (1) or (2). The method includes hot rolling a titanium billet of .beta. titanium alloy, (.alpha.+.beta.) titanium alloy or a near .alpha. titanium alloy into a wire rod, winding the hot rolled wire rod into a coil, cold drawing the wire rod, cutting the wire rod to obtain a bent wire rod, heating the bent wire rod to a straightening temperature T while both end portions of the bent wire rod are fixed, applying a predetermined elongation .epsilon. to the wire rod, maintaining a straightening temperature T, hot-straightening the wire in accordance with the expression (2) EQU .epsilon.(T-400).gtoreq.400 (1) EQU .epsilon.(T-500).gtoreq.200 (2) and cooling the wire rod while applying tension. The method is suitable for preparing a straight rod for use in an engine valve.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.