To increase the hardness of an end-part while maintaining working precision of an outer-peripheral screw and an inner-peripheral screw formed at the end-part, and preventing delayed breakage.
A method for manufacturing a hollow rack bar is provided with; a tooth part forming process in which the tooth part 12 is formed on a shaft part 11; an end-part hardening process in which a high-frequency induction-hardening is performed to the tooth side end-part 13; a first temperature end-part tempering process in which a high-frequency induction-tempering is performed at 1000C to the tooth side end-part 13; a screw-working process in which the screw-working for forming the screw 15 on the inner periphery of the tooth side end-part 13 is performed; a shaft part hardening process in which a high-frequency induction-hardening is performed to the shaft part 1 and tooth part 12; and a second tempering process in which the high-frequency induction-tempering is performed at 200C to the tooth side end-part 13, the shaft part 11 and the tooth part 12.
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| JP2018024904 | COOLING DEVICE AND COOLING METHOD |
| WO/2002/034957 | SINTERED SPROCKET |
MURATA TETSUYUKI
YAMAMOTO TAKESHI
KIYOZAWA YUTAKA
| JP2004359009A | 2004-12-24 | |||
| JPH06264992A | 1994-09-20 | |||
| JP2006123852A | 2006-05-18 | |||
| JP2004001679A | 2004-01-08 | |||
| JP2003312489A | 2003-11-06 | |||
| JPH06264147A | 1994-09-20 | |||
| JP2003160812A | 2003-06-06 | |||
| JP2003164941A | 2003-06-10 | |||
| JPH0958488A | 1997-03-04 | |||
| JPH0685174U | 1994-12-06 | |||
| JP2004359009A | 2004-12-24 | |||
| JPH06264992A | 1994-09-20 | |||
| JP2006123852A | 2006-05-18 | |||
| JP2004001679A | 2004-01-08 | |||
| JP2003312489A | 2003-11-06 | |||
| JPH06264147A | 1994-09-20 | |||
| JP2003160812A | 2003-06-06 | |||
| JP2003183737A | 2003-07-03 |
Satoshi Kono
Makoto Nakamura
Kurata Masatoshi
Takashi Mine
Yoshihiro Fukuhara
Sadao Muramatsu
Ryo Hashimoto