| 摘要 |
PROBLEM TO BE SOLVED: To provide a press molding method for a rack tooth, in which a rack tooth with high accuracy is molded by press-molding a thick plate material. SOLUTION: A thick plate material W1 is press-molded into a rack tooth 20 by conducting the following steps: a first pressing step, where the plate material W1 is pressed with an upper die 30 having tooth forms 31, which are formed on one plane so that crest parts 33 and trough parts 35 are alternately arranged in a longitudinal direction and the trough parts 35 are opened downward, and with a lower die 50 having tooth forms 51, which are formed on one plane so that protruded parts 53 facing to the trough parts 35 of the upper die 30 and recessed parts 55 facing to the crest parts 33 of the upper die 30 are alternately arranged in the longitudinal direction; and a second step, where the thick plate material W1 molded into a corrugated shape in the 1st step is turned upside down, engaged with the upper die 30 and the lower die 50, and pressed. COPYRIGHT: (C)2007,JPO&INPIT
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