Metal working – Method of mechanical manufacture – Pulley making
Patent
1991-01-28
1992-07-14
Echols, P. W.
Metal working
Method of mechanical manufacture
Pulley making
29892, B21K 142
Patent
active
051291460
DESCRIPTION:
BRIEF SUMMARY
CROSS-REFERENCE TO RELATED APPLICATION
This application contains subject matter related to application Ser. No. 07/646,730, filed Feb. 5, 1991.
TECHNICAL FIELD
The present invention relates to a method of manufacturing poly-V pulleys from sheet metal from, which way a disc-shaped sheet metal material, and the products thereof.
BACKGROUND ART
Poly-V pulleys are intended to transmit high speed rotation efficiently, and are used in the rotary transmission system of automobiles and other machines. A conventional example of such poly-V pulleys made from sheet metal made is disclosed in Layed-Open Japanese Patent Application No. 57-88929.
The manufacturing method of making poly-V pulleys from sheet metal disclosed in this Layed-Open Patent Application comprises the steps of forming a cup-shaped blank by drawing a disc-shaped sheet metal material, drawing the corner part of the boundary area of the bottom wall and peripheral wall of the cup-shaped blank to form the double folded ears projecting outside the peripheral wall in an annular shape, folding the outer edge part of the peripheral wall outward to form the ears projecting outside the peripheral wall in an annular shape, corrugating the peripheral wall by pressing in the axial direction with the bottom pattern and top pattern, and flattening the corrugated portion with the inner pattern and outer pattern by pressing from both sides to increase the wall thickness of the peripheral wall, and forming by rolling a poly-V groove at the outer side of the peripheral wall of the thus thickened cup-shaped blank.
In this manufacturing method, in order to increase the thickness of the peripheral wall of the cup-shaped blank, the disc-shaped sheet metal material is once formed into a cup shape, and its peripheral wall is increased in thickness, which requires complicated forming machines and takes a long time to increasing the wall thickness and forming.
It is therefore a primary object of the present invention to present a novel manufacturing method of making poly-V pulleys of sheet metal capable of increasing the thickness of the peripheral wall of a cup-shaped blank efficiently by simple forming equipment, and products obtained by this manufacturing method.
SUMMARY OF THE INVENTION
To achieve the above object, the invention presents a manufacturing method of making poly-V pulleys of sheet metal out of a sheet metal blank formed in a disc shape which comprises a peripheral end folding step for folding the peripheral end of the sheet metal blank in concave or convex form in a specified width range, a peripheral end thickening step for increasing the wall thickness by holding and flattening the peripheral end of the sheet metal blank folded in concave or convex form so as to be smaller in diameter than the diameter of the sheet metal blank before being folded in concave or convex form, and a cup-shaped blank forming step for bending the thickened peripheral end in one direction to form a cup-shaped blank, wherein plural V-grooves are formed at the outer side of the peripheral wall of the thus formed cup-shaped blank.
According to this manufacturing method, since the thickness of the portion corresponding to the peripheral wall of the cup-shaped blank can be increased, especially in a state of sheet metal blank formed in a disc shape, the conventional complicated thickening and forming equipment is not needed, and the portion corresponding to the peripheral wall of the cup shaped blank may be promptly increased in thickness by simple pressing equipment for pressing the disc shaped sheet metal blank from top and bottom.
When thus thickened the disc-shaped sheet metal blank is formed in a cup shape in the conventional procedure, a cup-shaped blank having a thickened peripheral wall is obtained.
In this manner, the manufacturing method of the invention is capable of increasing the thickness of the peripheral wall of a cup-shaped blank by simple equipment and at high efficiency.
The manufacturing method of the invention may, meanwhile, comprise a peripheral wall th
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patent: 4518374 (1985-05-01), Kanemitsu
patent: 4524595 (1985-06-01), Oda
patent: 4564137 (1986-01-01), Nakamura
patent: 4631946 (1986-12-01), Oda
patent: 4831705 (1989-05-01), Kanemitsu
patent: 4913689 (1990-04-01), Morishita et al.
Kanemitsu Toshiaki
Oda Kazuyuki
Echols P. W.
Kabushiki Kaisha Kanemitsu
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