| 摘要 |
The present invention relates to a hollow shaft thermal treatment method, comprising: a step of forming a female screw part on an inner diameter part of one end of a hollow shaft and preparing a fastening screw part wherein an air flow path penetrated along an axial direction is formed with a male screw part interlocked with the female screw part, and a suspension bolt having a hanging part integrated to one end of the fastening screw part; a step of suspending the hollow shaft to hang in a vertical direction by fastening the fastening screw part to the female screw part of the hollow shaft, hanging the hanging part on a horizontal suspension bar of a support frame; a step of performing heating thermal treatment by charging the support frame into a thermal treatment furnace; and a step of cooling the support frame by submerging the support frame after the thermal treatment into a cooling vessel accommodating a cooling liquid. By the same, the method of the present invention provides an effect of being able to improve a quality of a target for thermal treatment. |
