Method and apparatus for hot straightening elongated metal workpieces |
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| 申请号 | US3631698D | 申请日 | 1969-12-29 | 公开(公告)号 | US3631698A | 公开(公告)日 | 1972-01-04 |
| 申请人 | AEG ELOTHERM GMBH; | 发明人 | SEULEN GERHARD; REINKE FRIEDHELM; | ||||
| 摘要 | A method of straightening bent metal workpieces by nonmechanical means, namely by the use of magnetic flux generated by inductive heating moving the heated workpiece against stop members whereby straightening is achieved. In a preferred form of the invention the workpiece is quench hardened as well as straightened. The invention may be applied either to ferromagnetic or nonferromagnetic workpieces. | ||||||
| 权利要求 | 1. Apparatus for straightening an elongated bent metal workpiece comprising: straightening stop means means for mounting an elongated workpiece having at least substantial rotatory symmetry and for rotating said workpiece about its rotatory axis inductor means including at least one heating conductor extending in the direction of said rotatory axis for carrying an AC current for inducing a current in successive portions of said rotating workpiece so that the induced current heats said successive portion and further so that said AC current generates, together with the induced currents, a force which causes said workpiece to be thrust against said straightening stop means and straightened. 2. Apparatus for straightening an elongated bent metal workpiece as in claim 1 wherein said mounting means including a plurality of workpiece-receiving stations provided on a rotatable drumlike element, and further including a quenching bath and indexing means to rotate the said drumlike element whereby the workpiece-receiving stations may be moved in succession from a heating station to a predetermined position in the said quenching bath. 3. Apparatus for straightening an elongated bent metal workpiece as in claim 1 wherein said workpiece retains ferromagnetic properties for the duration of the straightening treatment and said straightening stop means is located so as to be interposed between a workpiece in its heating position and said inductor means. 4. Apparatus according to claim 1 in which the said straightening stop means are rollers. 5. Apparatus according To claim 4 including drive means for rotating the said rollers. 6. Apparatus according to claim 1 wherein said straightening stop means are adjustably movable towards or away from the workpiece. 7. Apparatus according to claim 6 wherein the movement of the said stop means to and from the workpiece is controlled by control means responsive to predetermined time intervals or to the surface temperature of a workpiece being heated. 8. Apparatus for straightening an elongated bent workpiece as in claim 1 wherein said workpiece is of nonferromagnetic metal, and said straightening stop means is located so as to be on the side of a workpiece in its heating position which faces away from said inductor means. 9. Apparatus as in claim 1 including means for rotating said workpiece so that said current is induced in successive portions of said workpiece as said workpiece rotates. 10. Apparatus as in claim 1 wherein said current induced in said workpiece heats said workpiece to its hardening temperature and including means for quenching said workpiece. 11. Apparatus as in claim 1 wherein said inducing means includes a first conductor extending along the length of said workpiece, a second return conductor connected to said first conductor and extending along the length of said workpiece and magnetic flux path means extending along the length of said conductor. 12. Apparatus as in claim 11 wherein said flux path means separates said first conductor from said second conductor. 13. Apparatus as in claim 11 further including a third return conductor connected to said first conductor and extending along the length of said workpiece. |
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