Metal deforming – By use of tool acting during relative rotation between tool... – During rotation of work
Patent
1998-02-17
1999-05-18
Larson, Lowell A.
Metal deforming
By use of tool acting during relative rotation between tool...
During rotation of work
2989332, B21H1/04
Patent
active
059040602
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a sheet metal member integrally having a peripheral wall surrounding a base plate, such as in piston components and a drive plate employed in the automatic transmission of an automobile, and a method of thickening a peripheral wall thereof. Specifically, the present invention relates to the employment of a thin disc-shaped sheet metal material, thereby forming a peripheral wall whose thickness is several times the thickness of the disc-shaped sheet metal material.
2. Description of the Prior Art
Conventionally, a technique for roll forming a sheet metal member integrated with a peripheral wall which is slightly thicker than a base plate, and surrounding the base plate by means of a forming roller, is often employed. However, it has been impossible to provide a method of thickening the peripheral wall of the sheet metal member so as to be several or more times the thickness of the base plate by employing the conventional roll forming method, and it has not been thought of to form the sheet metal member having a peripheral wall whose thickness reaches a value which is several times more than that of the base plate.
Therefore, in the sheet metal member integrally having a peripheral wall surrounding the base plate, such as in piston components, the sheet metal member having the peripheral wall whose thickness is increased several times the thickness of the base plate is conventionally formed by a cutting process. However, the yield on material in the cutting process is low, thereby causing an uneconomical state.
The present invention has been developed in view of the above mentioned circumstances. It is an object of the present invention to provide a sheet metal member integrally having a peripheral wall, surrounding the base plate, whose thickness is increased so as to be several times the thickness of the base plate.
It is another object of the present invention to provide a method of thickening a peripheral wall of the sheet metal member, enabling the thickness of the peripheral wall to be increased so that it is several times the thickness of the base plate.
SUMMARY OF THE INVENTION
In order to achieve the above objects, a sheet metal member having a peripheral wall according to the present invention comprises a circular base plate, and a peripheral wall protruding axially from an outer periphery of the circular base plate to one side, the peripheral wall being integrated with the circular base plate, wherein an axial thickness of the peripheral wall is increased so as to be 4 or more times the thickness of the base plate, and a radial thickness of the peripheral wall is increased so as to be 2 or more times the thickness of the base plate.
The sheet metal member having the peripheral wall according to the present invention is thickened by the success of the thickening method mentioned below, so that the axial thickness of the peripheral wall is 4 or more times the thickness of the base plate and the radial thickness thereof is 2 or more times that of the base plate. Then, an outer surface of the peripheral wall is provided with annular grooves to be concentric with the peripheral wall, or a boss is disposed on a center of the base plate so as to be integrated therewith, thereby enabling the sheet metal member to be employed as in piston components. Moreover, the base plate is thin, and the peripheral wall is thickened. Accordingly, the cost of the material is low.
A method of thickening a peripheral wall of a sheet metal member according to the present invention comprises a first forming step having plural small steps, and each small step comprises a series of steps of holding pressingly a disc-shaped sheet metal material in an interposed state, between a first rotating die and a second rotating die, making the disc-shaped sheet metal material rotate with the first rotating die and the second rotating die, pressing a first forming roller having a first groove-shape forming surface wherein a pair of annular surfaces
REFERENCES:
patent: 5152061 (1992-10-01), Himmeroeder
patent: 5699689 (1997-12-01), Yamanaka
Kanemitsu Shuji
Kanemitsu Toshiaki
Nishioka Hironori
Kabushiki Kaisha Kanemitsu
Larson Lowell A.
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