Title:
【発明の名称】ラツク部とパイプ部とからなるラツクバーの焼入れ方法
Document Type and Number:
Japanese Patent JP2591954
Kind Code:
B2
Abstract:
PURPOSE:To make quenching strain smaller and to make mechanical straightening unnecessary by executing the quenching of the rack part and the pipe part respectively under the specific conditions at the time of quenching the rack bar cover its whole length and circumference while shifting the rack bar. CONSTITUTION:The work W composed of the rack part (r) and the pipe (p) is supported with center shafts S1, S2, and a heating coil C and a cooling jacket J' con nected with a connecting member U at the prescribed interval are shifted in the work W shaft direction to execute quenching. Then, the quenching for rack part (r) is execut ed with the teeth part (g) downward under non-rotating condition and opening part of a horseshoe type cooling jacket J is faced downward, and fluid coolant is injected in the radial direction against the circular arc of the rack part (r) and in a diagonal direction from the underside against the teeth part (g). Further, the quenching of the pipe (p) is executed under condition of lower output from heating power source than that to the rack part (r) and while rotating the work W. By this method, the quenched layer having a prescribed depth is formed in the teeth part (g) of the rack part (r) and also in the pie part (p), a quenched layer having the prescribed depth according to the thickness of the pipe can be formed.
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Inventors:
TANAKA HITOSHI
TAKAHASHI TADASHI
TAKAHASHI TADASHI
Application Number:
JP13000487A
Publication Date:
March 19, 1997
Filing Date:
May 28, 1987
Export Citation:
Assignee:
KOSHUHA NETSUREN KK
International Classes:
C21D9/08; C21D1/10; C21D9/32; (IPC1-7): C21D9/32; C21D1/10; C21D9/08
Domestic Patent References:
| JP61261424A | ||||
| JP5769850U | ||||
| JP5852534B2 | ||||
| JP611490B2 |
Attorney, Agent or Firm:
Shigenobu Oshiro