Title:
HIGH-STRENGTH SPRING AND MANUFACTURE OF SAME
Document Type and Number:
Japanese Patent JP2001009725
Kind Code:
A
Abstract:
To provide a spring that is high in strength and in formability at the same time.
This manufacturing method subjects a formed spring to nitriding and to a plurality of cycles of shot peening, the last one of which projects shot balls of a diameter of 0.05 to 0.25 mm and a hardness of 600 to 850 Hv onto the spring at a projection speed of 20 to 60 m/s. The surface roughness remains small, and the point where a maximal compressive residual stress is present is nearer to the surface. This surface hardening treatment permits the use of materials of appreciable formability.
Inventors:
AOKI TOSHINORI
SAKAKIBARA TAKAYUKI
WAKITA MASAMI
SAKAKIBARA TAKAYUKI
WAKITA MASAMI
Application Number:
JP2000127067A
Publication Date:
January 16, 2001
Filing Date:
April 27, 2000
Export Citation:
Assignee:
CHUO HATSUJO KK
International Classes:
B24C1/10; B24C11/00; C21D1/06; C21D7/06; C21D9/02; C22C38/00; C22C38/34; F16F1/02; (IPC1-7): B24C1/10; B24C11/00; C21D1/06; C21D7/06; C21D9/02; C22C38/00; C22C38/34; F16F1/02
Attorney, Agent or Firm:
Ryohei Kobayashi