Metal deforming – By use of closed-die and coacting work-forcer – Forcing work into or within closed die; e.g. – forging
Patent
1998-10-01
2000-12-05
Hail, III, Joseph J.
Metal deforming
By use of closed-die and coacting work-forcer
Forcing work into or within closed die; e.g., forging
723534, 723542, 72393, B21D 2200
Patent
active
061550949
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to press tools and more particularly, but not exclusively, to press tools for forming or shaping into an annular form of desired dimensions the end turns of wound wire coils of the stator of an electrical machine such as an electric motor.
BACKGROUND OF THE INVENTION
It is known to provide a forming press and tooling to form the end turns of the wound wire coils of a stator into an annulus of given external and internal diameters and axial length in a three stage process in which outer segments of the tooling contract to compress the end turns to define the outer diameter of the annulus, inner segments of the tooling expand to compress the end turns to define the inner diameter of the annulus and an annular end member is moved axially against the end turns to compress the end turns to define the axial length of the annulus.
A problem associated with the known tooling is that during the movement of the inner and outer segments and/or the end member, it is sometimes possible for the wire of the end turns to become trapped between the parts of the tooling so that the coils are damaged.
It is an object of the invention to provide tooling which will prevent or at least mitigate this problem.
SUMMARY OF THE INVENTION
According to the invention a press tool for forming a compressible mass into an annulus of given inner and outer diameters and axial length comprises radially movable inner and outer tool parts adapted to expand and contract respectively to form the mass to the desired inner and outer diameters, each of which tool parts comprises a first array of radially movable members, each of which members is formed with a head having a working face curved to the desired diameter, and each of which tool parts comprises a second array of radially movable members which are interposed between the respective members of the first array and which each have a head having a working face, a central portion of which working face is curved to the desired diameter and opposed sloping outer portions of which are shaped for sliding contact against rear faces of the heads of respective adjacent members of the said first array, whereby the first and second arrays of movable members can be moved radially to compress the compressible mass into the desired diameter and so that during at least a part of the radial movement, the heads of the first and second arrays form continuous substantially annular surfaces, and an axially movable annular member having a working face for forming the compressible mass to the desired axial length. Preferably the radially movable members and the annular member are mounted in a common body which may, for example, be plate-like or annular.
Preferably the axially movable annular end member is arranged in its axially retracted position to have its working face flush with a surrounding stationary body part substantially to eliminate gaps into which the compressible mass might become trapped.
The means for actuating the radially and axially movable parts of the press tool may be generally conventional, i.e. cam means, wedge means or the like and the actuating means may be under the control of one or more hydraulic rams, electrical actuators or the like.
From another aspect the invention is a forming press comprising tooling as described above.
Although the apparatus referred to in the description and claims is said to be for the purpose of forming a compressible mass into an annulus of given size, it will be appreciated that the apparatus may be used to form generally analogous shapes by suitably configuring the working faces of the movable members. Thus the faces of the members may be flat or comprise a series of flats, so that the movable members together form a compressible mass to a generally annular shape. References to the curved working faces of the movable members should be construed accordingly.
Among the advantages of the press tool shown in the following drawings are the following:
1. The press tool permits a reduction in the size of the form
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Norman Peter Michael
Witwer Keith Alan
Franklin Electric Company, Inc.
Hail III Joseph J.
Hong William
Statomat Special Machines Ltd.
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