Metal deforming – By use of closed-die and coacting work-forcer – Forcing work into or within closed die; e.g. – forging
Patent
1990-03-13
1991-12-31
Larson, Lowell A.
Metal deforming
By use of closed-die and coacting work-forcer
Forcing work into or within closed die; e.g., forging
72364, B21K 176
Patent
active
050760890
ABSTRACT:
A method of manufacturing a hemisphere shoe provided between a piston and a slant plate of a swash plate compressor, said method comprises the steps of: cutting a cylindrical blank corresponding to a weight of the hemisphere shoe; plastic-working the cylindrical blank into a blank to be cold-forged having a large diameter plane portion at one end and a small diameter plane portion at another end and a body portion having a curved surface and a higher height than the finished hemisphere shoe and a smaller maximum diameter than the finished hemisphere shoe in a middle portion of the blank; positioning the blank so that the small diameter plane portion contacts with a recess die sufrace of a first die and the large diameter plane portion contacts with a substantially plane die surface of a second die; cold-forging the blank to be cold-forged by pressing the both dies till the dies are in a close contact with each other by means of a cold-forging press including the first die haivng a hemisphere recess die of a substantial hemisphere shape with a radius anticipating a strain caused by a heat-treating; heat-treating the cold-forged hemisphere shoe; and glaze-plishing the heat-treated hemisphere shoe.
REFERENCES:
patent: 3378412 (1968-04-01), Mansfield et al.
patent: 3675459 (1972-07-01), Dohmann
patent: 4754908 (1988-07-01), Tanaka et al.
Chubu Rashiseisakusho Co., Ltd.
Larson Lowell A.
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