Title:
MANUFACTURE OF HOLLOW CAM SHAFT
Document Type and Number:
Japanese Patent JPS63134806
Kind Code:
A
Abstract:
PURPOSE:To enable the manufacture of a hollow cam shaft a low cost by forc ing a plastic deformation of a steel pipe through a cold extrusion process using a die and a core bar. CONSTITUTION:A drawn portion 11 is formed on one end of a steel drawn hollow pipe 1. After inserting into the pipe 1 a core bar 2 of a cylindrical shape composing of four stage outside diameters, the pipe 1 is set in a cold extrusion forming machine composed of a die 3a and a press P of a thick plate as its main component. The pipe 1 and the core bar 2 are inserted into and drawn through the die 3a in one until by having it extruded with the press P from the rear and, next, the pipe 1 and the core bar 2 are inserted into and drawn through a die 3b having a larger hole diameter than the die 3a. The core bar 2 is drawn out from the pipe 1 and the drawn portion 1 cut off. With this constitution, the shaft 1 is formed with two stages of the outside circumferential surface composing of a small diameter portion 14 having four V shape grooves 4 in the shaft direction along the hole shape of the die 3a and a large diameter portion 13 along the hole shape of the die 3b, and with the inside circumferential surface along the external shape of the core bar 2.
Inventors:
SUZUKI YASUO
Application Number:
JP28281386A
Publication Date:
June 07, 1988
Filing Date:
November 27, 1986
Export Citation:
Assignee:
NIPPON PISTON RING CO LTD
International Classes:
F01L1/04; F01L1/047; F16H53/02; (IPC1-7): F01L1/04
Domestic Patent References:
| JPS49130359A | 1974-12-13 | |||
| JPS5441266A | 1979-04-02 |
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