Processing method of tube body, manufacturing method of cylinder device and cylinder device manufactured by the same

a technology of cylinder device and manufacturing method, which is applied in the direction of spring/damper, mechanical apparatus, shock absorber, etc., can solve the problems of increasing work cost, affecting the quality of cylinder body parts, and affecting the quality of cylinder parts, so as to achieve accurate processing of the end portion of the tube body
US20080314113A1Inactive Publication Date: 2008-12-25HITACHI LTD
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
HITACHI LTD
Publication Date
2008-12-25
Estimated Expiration
Not applicable · inactive patent

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Abstract

There is provided a processing method of a tube body comprising the steps of a tube-expanding step wherein a base tube is partially retained with a chuck unit having a rotational function, and a mandrel is pressed in to an end portion of the base tube so as to expand the end portion of the base tube; and a rotation ironing step wherein the chuck unit rotates the base tube together with the mandrel a roller die is pressed against an outer-periphery surface of the end portion of the base tube and the roller die is moved with respect to the base tube and in an axial direction thereof so as to deform an inner periphery surface of the end portion of the base tube into a shape corresponding to an external shape of the mandrel.
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Description

BACKGROUND OF THE INVENTION

[0001] 1. Field of the Invention

[0002] The present invention relates to a processing method of a tube body wherein thickness of an end portion of the tube body is reduced by plastic working so as to finish in a predetermined dimension, a manufacturing method of a cylinder device using the processing method, and the cylinder device manufactured by the same.

[0003] 2. Description of the Related Art

[0004] For example, as regards a hydraulic damper (shock absorber) of a twin tube type, as shown in FIGS. 11 and 12, an inner cylinder 1 slidably housing a piston 8 is introduced into an outer cylinder 2 with a base. One end of a piston rod 3, opposite to the other end connected to the piston 8, is inserted into a rod guide 4 and an oil seal 5 both installed in an open end of the inner cylinder 1 and the outer cylinder 2 so as to extend outside. According to extension and compression movement of the piston rod 3, damping force will be generated by flow resistance of hyd...

Claims

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