Title:
【発明の名称】ピストンリングを製造する機械
Document Type and Number:
Japanese Patent JP2568997
Kind Code:
B2
Abstract:
Piston rings having a required variation in curvature around their circumference are produced from a thin steel strip (11) by passing the strip around rollers (10; 12, 30; 41, 42, 43, 44; 46). The position of at least one of the rollers (12; 46) can be varied by a digital control system (15, 16, 17) to provide the required variation in curvature. The provision of such a system allows the ring profile to be readily changed and for high production rates to be achieved.
Inventors:
William Peter Austin
William Craig Morrison
William Craig Morrison
Application Number:
JP5865685A
Publication Date:
January 08, 1997
Filing Date:
March 25, 1985
Export Citation:
Assignee:
APL PLC
International Classes:
B21D5/14; B21D7/08; B21D7/12; B23D15/06; F16J9/12; (IPC1-7): B21D7/08; B23D15/06
Domestic Patent References:
| JP49130355A | ||||
| JP5659532A | ||||
| JP5081951A | ||||
| JP55102051U | ||||
| JP522717B2 | ||||
| JP5823812B2 |
Other References:
【文献】西独特許公開2838128(DE,A)
【文献】仏国特許公開2517226(FR,A)
【文献】仏国特許公開2517226(FR,A)
Attorney, Agent or Firm:
Toshio Yano