車両懸架用コイルばねと、その製造方法

Japanese Patent JP5393280

B2

A spring wire (20) with hardness of 50 to 56 HRC is subjected to first and second shot peening processes (S6) (S7) within a warm working temperature range of 150 to 350°C. In the first shot peening process (S6), the first shot of a shot size of 1.0 mm or more is used. In the second shot peening process (S7), the second shot smaller in shot size than the first shot is used. Through these shot peening processes (S6) (S7), compressive residual stress is imparted to the spring wire (20). The spring wire (20) includes a residual stress increase part (T1 residual stress peak part (T3), and residual stress decrease part (T4). In the residual stress decrease part (T4), a part (B) including the compressive residual stress magnitude of which is equivalent to the magnitude of the compressive residual stress at the surface of the spring wire (20) exists at a position at a depth exceeding the permissible pit depth (R max ).

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Akira Tange
Hideki Okada
Sumiyoshi Isao
Mitsuhiro Sugiyama

JP2009144460A

January 22, 2014

June 17, 2009

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Nippon Jojo Co., Ltd.

B24C1/10; C21D7/06; F16F1/06

JP2008106365A
JP2004085685A1
JP2003055643A1

Suzue International Patent Office
Kurata Masatoshi
Satoshi Kono
Makoto Nakamura
Yoshihiro Fukuhara
Takashi Mine
Toshio Shirane
Sadao Muramatsu
Nobuhisa Nogawa
Kocho Chojiro
Naoki Kono
Katsu Sunagawa
Tetsuya Kazama
Katsumura Hiro
Shoji Kawai
Tatsushi Sato
Takashi Okada
Mihoko Horiuchi
Takenori Masanori
Takuzo Ichihara
Yamashita Gen

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