| 摘要 |
A method of and an apparatus for remelting and hardening an elongate workpiece such as a shaft having a plurality of axially spaced shaft portions to be processed. The shaft is held in a second position, heated, and thereafter transferred to a first position close and parallel to the second position. The shaft is then held in the first position, and the outer surface of one of the shaft portions is remelted and hardened with a torch. Thereafter, the torch is moved parallel to the shaft to remelt and harden the adjacent shaft portions successively. An apparatus for carrying out the method includes a device for holding the shaft in the second position, a preheating device for heating the shaft, a device for holding the shaft in the first position, a device for rotating the shaft about its own axis, a torch for remelting and hardening the outer surfaces of the shaft portions, and a torch moving device for moving the torch axially along the shaft successively into facing relation to the outer surfaces of the shaft portions.
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