Metal deforming – By tool-couple embodying nonplanar tool-face – Similar tool-faces
Reexamination Certificate
1999-07-07
2001-04-03
Crane, Daniel C. (Department: 3725)
Metal deforming
By tool-couple embodying nonplanar tool-face
Similar tool-faces
C072S407000, C072S335000
Reexamination Certificate
active
06209381
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a method and a system for chamfering, and to a press therefor. More specifically, the invention relates to a chamfering method and a chambering system for chamfering a material, illustratively a plate or sheet blanked or punched by a press, and to a press therefor.
2. Description of the Related Art
There is disclosed a chamfering method in Japanese Patent Application Laid-Open Publication No. 6-14151 (hereinafter referred to as “first related art”).
In the first related art, a core plate is laminated to form a core of a rotor of an electric motor, chamfers are formed on an upper surface of an uppermost core plate and a lower surface of a lowermost core plate, respectively, of the core. Because only the outside surfaces of the uppermost and lowermost core plates and arc subject to chamfering, and because a pressing operation is used in the sequence of laminating each of the core plates, separate chamfering operations are performed to form the chamfers on the uppermost and lowermost core plates.
Depending upon application of the member, there are of course cases in which both surfaces of the punched part will be chamfered. For example, in Japanese Utility Model Application Laid-Open Publication No. 3-124027 (hereinafter referred to as “second related art”), there is disclosure of clutch plates which are used in a coupling that transmits power via the viscous resistance of a fluid. The clutch plates each have chamfers formed at both sides thereof.
In the case of the second related art, chamfers of predetermined dimensions are formed at both surfaces of a clutch plate blank by the action of a fixed lower punch and an upper punch that has the same shape on its end part as the lower punch and is slide-dropped thereonto.
When the press chamfering operation is continued for a long period of time, however, because of such factors as thermal expansion of the press itself and the dies, minute variations in the bottom dead point (stroke end point) of the slide-dropped upper punch occur, this being accompanied directly by variations in the chamfer dimensions. In the case of the first related art, burrs may remain on the motor core plates, leading to a damage on winding wires. In the case of the second related art, the clutch plate in the coupling may get adhered to the adjacent clutch plate because of a hump. To avoid such problems, it is important to perform the troublesome task of maintaining control of accuracy of the bottom dead point of the upper punch.
SUMMARY OF THE INVENTION
The present invention has been achieved with such points in view.
It therefore is an object of the invention to provide a chamfering method and a chamfering system that can minimize a potential influence of chamfering stroke accuracy on chamfer dimensions to eliminate conventional drawbacks, as well as a press therefor.
To achieve the object, an aspect of the invention provides a chamfering method comprising chamfering a material, resiliently supporting the material.
Another aspect of the invention provides a chamfering system comprising a chamfering mechanism for chamfering a material, and a support mechanism for resiliently supporting the material to be chamfered by the chamfering mechanism.
Another aspect of the invention provides a press for simultaneously forming chamfers at edges on both sides of a material using a pair of chamfering punches to exert chamfering pressures thereon, wherein the press includes a pair of chamfering punches either resiliently supported.
REFERENCES:
patent: Re. 23939 (1955-02-01), Keller
patent: 2438837 (1948-03-01), Archer
patent: 3796086 (1974-03-01), Phillips
patent: 3803898 (1974-04-01), Speakman
patent: 3895922 (1975-07-01), Phillips
patent: 4248075 (1981-02-01), Whitley
patent: 4821388 (1989-04-01), Okumura
patent: 5024075 (1991-06-01), Simonetto
patent: 6018977 (2000-02-01), Kanno
patent: 2024054 (1980-01-01), None
patent: 3-124027 U (1991-12-01), None
patent: 6-141516 (1994-05-01), None
Ikemoto Hiroshi
Yagisawa Yuji
Yaguchi Tetsuo
Crane Daniel C.
Kuroda Precision Industries
Morrison & Foerster
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