Metal working – Method of mechanical manufacture – Assembling or joining
Reexamination Certificate
1999-05-26
2001-03-20
Hughes, S. Thomas (Department: 3726)
Metal working
Method of mechanical manufacture
Assembling or joining
C029S509000
Reexamination Certificate
active
06202283
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a method of manufacturing a shaft with surfaces thereof modified, and more particularly to a method of manufacturing a shaft having a wire, which is formed of a different material from that of the shaft, fixed to and united with regions below the surface of the shaft.
BACKGROUND ART
A technology for preventing damage or abrasion on surfaces of a metallic material is classified roughly into the surface transformation method and the surface coating method.
The former technology includes a method of forming an alloy layer on surfaces, such as the cementation method, the nitriding method, the metallic cementation and the like, or quench hardening by heating, a method making use of residual stress, or the shot peening method. These methods involve complicated and large apparatuses therefor, and are inapplicable or difficult to be applicable to a base material for a shaft, which is composed of a soft metal such as aluminum or the like.
In contrast, the latter technology includes a metal plating method typified by hard chromium plating, the metalizing method, the ceramic coating method, which uses ceramics such as cermet, but involves a disadvantage in poor durability due to a difficult point in its bonding strength for a base material for the shaft, which is composed of a soft material such as aluminum or the like, as well as relatively low productivity.
Also, as a surface treatment method for an aluminum alloy, a method is known which comprises applying the electrochemical treatment (anodic oxidation method) on surfaces of the alloy to form a protective film composed of aluminum oxides and having a thickness of several to several tens microns to enhance its surface hardness. However, such protective film is small in thickness to be liable to wear, and has less chemical resistance to be liable particularly to erosion by alkali. In addition, there is caused a problem in cost because it takes considerable time to form such protective film.
Further, the above-mentioned various methods apply to metals as the base material, and are not very applicable to synthetic resin materials.
SUMMARY OF INVENTION
The present invention solves the problems of the prior art, and has as its object to provide a method of manufacturing a shaft with surfaces thereof modified; the method serving to improve the hardness of surfaces of a base material for a shaft in a relatively simple manner, and transforming properties of surfaces of the base material for a shaft to make the base material for a shaft applicable to other uses.
The present invention provides a method of manufacturing a shaft with surfaces thereof modified, comprising the steps of: forming a thread groove on surfaces of a cylindrical-shaped base material for a shaft; continuously winding a length of wire in and along the thread groove; and followed by compressing a peripheral surface of the base material for the shaft with the length of wire wound and received in the thread groove, in a direction of diameter reduction to perform plastic deformation of crests of thread ridges between the adjacent thread grooves or the crests and the wire to have the length of wire fixed to and united with the base material for the shaft.
Preferably, a rolling method is used to form the thread groove and to have the length of wire fixed to and united with the base materials for the shaft.
In addition, a preferable combination of materials in practicing the invention can include:
(1) A. base material for a shaft: aluminum or aluminum alloy
B. wire: metallic wire having a greater hardness than that of the base material for a shaft
(2) A. base material for a shaft: structural plastics
B. wire: metallic wire having a good conductivity
Of course, other combinations than the above ones are possible in practicing the invention. The reason for this is that optimum combinations change depending upon the use of the shafts.
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Kato Keigo
Mizuno Masataka
Aoyama Seisakusho Co., Ltd.
Cozart Jermie E.
Frishauf, Holtz Goodman, Langer & Chick, P.C.
Hughes S. Thomas
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