| 摘要 |
<p>PURPOSE:To reduce a production process and to avert the variance between products by continuously moving a martensitic stainless steel wire while said wire is kept applied with prescribed tension and subjecting the steel wire to a soln. heat treatment by high-frequency heating then to hardening and tempering. CONSTITUTION:The martensitic stainless steel wire 2 is drawn out of a supply stand 1 and is passed between rollers 3 for back tension, by which the specified tension smaller than the yield strength at the soln. heat treatment temp. is applied to the steel wire 2. The steel wire 2 is moved in this state and is heated by a high-frequency heating means 4, by which the steel wire is executed to the soln. heat treatment. The treated steel wire is then hardened in an oil hardening tank 5. The steel wire 2 is thereafter passed through a degreasing tank 6 and is tempered by cooling the same after heating the wire with a high-frequency heating means 7. The tempered steel wire is cut to the length of a prescribed shaft. The generation of bends, etc. at the cut ends in the cutting stage is decreased and the product which has the extremely low variance in hardness, etc., between the products is quickly produced.</p> |
