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Shaft holding sleeve, shaft diameter enlarging apparatus and jig for shaft diameter enlarging apparatus

Inactive Publication Date: 2016-12-01
NETUREN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The technical effect of this patent is to improve a method for enlarging the diameter of a shaft.

Problems solved by technology

However, when inserting or removing the shaft holding sleeve with respect to the fitting hole, the air confined inside the fitting hole may hinder a smooth insertion or removal of the shaft holding sleeve.

Method used

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  • Shaft holding sleeve, shaft diameter enlarging apparatus and jig for shaft diameter enlarging apparatus
  • Shaft holding sleeve, shaft diameter enlarging apparatus and jig for shaft diameter enlarging apparatus
  • Shaft holding sleeve, shaft diameter enlarging apparatus and jig for shaft diameter enlarging apparatus

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Embodiment Construction

[0029]FIGS. 1A to 5B are diagrams illustrating various examples of a shaft diameter enlarging method.

[0030]In the shaft diameter enlarging method shown in FIGS. 1A to 1E, a shaft stock W is rotated while a bending angle is applied to the shaft stock W in a state in which an axial compression stress is exerted thereon, thereby enlarging a portion of the shaft stock W.

[0031]As shown in FIG. 1A, both end portions of the shaft stock W are respectively inserted into a pair of shaft holding sleeves 1a and 1b arranged on a reference line A to face each other. In addition, both end portions of the shaft stock W are respectively abutted to bottoms of the shaft holding sleeves 1a and 1b, and thus the shaft stock W is sandwiched by the pair of shaft holding sleeves 1a and 1b. A predetermined gap D is interposed between the pair of shaft holding sleeves 1a and 1b and the gap D is determined depending on an axial length and an outer diameter of a radially enlarged portion formed on the shaft sto...

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Abstract

A shaft holding sleeve is inserted in a fitting hole of a compressing machine of a shaft diameter enlarging apparatus that applies an axial compression stress to a shaft stock to hold an end portion of the shaft stock during a shaft diameter enlarging process for radially enlarging a portion of the shaft stock. The shaft holding sleeve includes a front end surface to be inserted in the fitting hole, an exposed portion to be exposed to an outside of the fitting hole, and at least one air communication passage extending from the front end surface to a surface of the exposed portion. A jig may be attached to the shaft diameter enlarging apparatus to facilitate the insertion of the shaft holding sleeve into the fitting hole.

Description

TECHNICAL FIELD[0001]The present invention relates to a shaft holding sleeve, a shaft diameter enlarging apparatus and a jig for the shaft diameter enlarging apparatus.BACKGROUND ART[0002]A shaft diameter enlarging method is known as a method for forming a large diameter portion on an axially intermediate portion of a shaft stock. According to an example of the shaft diameter enlarging method, a shaft stock is rotated with a bending angle being given to the shaft stock in a state in which an axial compression stress is applied to the shaft stock, thereby enlarging a portion of the shaft stock to form the large diameter portion.[0003]A shaft diameter enlarging apparatus typically includes a pair of shaft holding sleeves for holding respective end portions of a shaft stock and a pair of spindles arranged along a reference line, along which the shaft stock is arranged. Each spindle has a fitting hole into which a corresponding holding sleeve is inserted. The shaft holding sleeves are i...

Claims

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Application Information

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IPC IPC(8): B21J5/08B21J13/00
CPCB21J13/00B21J5/08B21K1/12
Inventor KUWAHARA, YOSHITAKAMORI, KAZUKIOKAMOTO, MITSUHIROIKEDA, TAKASHIIKUTA, FUMIAKI
Owner NETUREN CO LTD