Claims
- 1. A method of increasing the torsional strength of metal wire by the steps of:
- a. cold drawing the wire to at least a 75% reduction in cross-sectional area;
- b. twisting the wire while in a plastically deforming state substantially within the reducing zone of the die;
- c. confining the wire twist in the reducing zone of the die by means of cooperating twist arresting rolls; and
- d. preventing over twist of the wire.
- 2. The method of claim 1 wherein the twisting is at least one T.P.I. of length.
- 3. The method of claim 1 wherein the twist angle ranges from 1.degree. to 45.degree..
- 4. The method of claim 1 wherein the metal is type 18-8 stainless steel.
- 5. A method of making an elongated metal bar having increased torsional strength properties in a preselected direction comprising the steps of:
- a. cold reducing the bar to a level wherein a portion of the microstructure exhibits elongated fibers;
- b. plastically deforming the elongated fibers by simultaneously twisting and reducing the bar substantially within the reducing portion of a die to increase the length of the elongated fibers and cause the elongated fibers to be in a helical orientation with relation to the longitudinal axis of the bar; and
- c. confining the wire twist within the reducing section of the reducing die by means of cooperating twist arresting rolls.
CROSS REFERENCE TO CO-PENDING APPLICATION
This application is a divisional application of my co-pending application Ser. No. 334,223, filed Feb. 21, 1973 now U.S. Pat. No. 3,883,371.
US Referenced Citations (6)
Divisions (1)
|
Number |
Date |
Country |
Parent |
334223 |
Feb 1973 |
|