| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a shaft-thickening method accompanied by heating to a shaft material, in which heating of the shaft material is optimally performed by clarifying the deformation behavior and mechanism of shaft-thickening under such a high-temperature condition that heat radiation from the shaft material to grasping parts and cooling of the material are caused. <P>SOLUTION: The optimum conditions of a compression stress, a work temperature, and rotation-numbers of shaft-thickening, which are the conditions for performing shaft-thickening of a work fluidized by heating, are set as follows. The value of σ<SB POS="POST">c</SB>/σ<SB POS="POST">y</SB>(σ<SB POS="POST">c</SB>is a compression stress, and σ<SB POS="POST">y</SB>is a yield stress of a work at each temperature) is arbitrarily determined, and a compression stress to be applied to the work or a work temperature at the starting time of shaft-thickening is determined. Thus, the conditions of an optimum compression stress corresponding to a work temperature and an optimum work temperature corresponding to a compression stress are obtained, and an optimum condition of rotation numbers N of shaft-thickening is calculated. Further, an initial grasping width l<SB POS="POST">0</SB>of the work is calculated, and then the work is subjected to shaft-thickening at least with these optimum conditions of shaft-thickening. <P>COPYRIGHT: (C)2012,JPO&INPIT |
