Title:
VEHICLE SUSPENSION COIL SPRING AND METHOD FOR MANUFACTURING SAME
Document Type and Number:
WIPO Patent Application WO/2010/146898
Kind Code:
A1
Abstract:
A spring wire (20) having a hardness of 50 to 56 HRC is subjected to a first shot-peening step (S6) and a second shot-peening step (S7) in a temperature range from 150 to 350°C. At the first shot-peening step (S6), a first shot having a shot size of 1.0 mm or more is used. At the second shot-peening step (S7), a second shot smaller than the first shot is used. At the shot-peeing steps (S6, S7), a compression residual stress is imparted to the spring wire (20). The spring wire (20) has a residual stress increased region (T1), a residual stress peak region (T3), and a residual stress decreased region (T4). Within the residual stress decreased region (T4), a region (B) having a compression residual stress equivalent to that of the surface of the spring wire (20) is present at the depth greater than an allowable pit depth (Rmax).
Inventors:
TANGE, Akira (())
丹下 彰 (())
OKADA, Hideki (())
岡田 秀樹 (())
丹下 彰 (())
OKADA, Hideki (())
岡田 秀樹 (())
Application Number:
JP2010/052659
Publication Date:
December 23, 2010
Filing Date:
February 22, 2010
Export Citation:
Assignee:
NHK SPRING CO., LTD. (3-10, Fukuura Kanazawa-ku, Yokohama-sh, Kanagawa 04, 〒2360004, JP)
日本発條株式会社 (〒04 神奈川県横浜市金沢区福浦３丁目１０番地 Kanagawa, 〒2360004, JP)
TANGE, Akira (())
丹下 彰 (())
OKADA, Hideki (())
日本発條株式会社 (〒04 神奈川県横浜市金沢区福浦３丁目１０番地 Kanagawa, 〒2360004, JP)
TANGE, Akira (())
丹下 彰 (())
OKADA, Hideki (())
International Classes:
B24C1/10; C21D7/06; F16F1/06
Attorney, Agent or Firm:
SUZUYE, Takehiko et al. (1-12-9 Toranomon, Minato-k, Tokyo 01, 〒1050001, JP)
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