Highly strengthened spring and process for producing the same
AssigneeNHK Spring Co., Ltd.
InventorsAkira Tange, Kotoji Ando, Koji Watanabe
Life of this patent
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Abstract
In a production process for highly strengthened springs, the process comprises performing a first shot peening to a spring steel having a hardness of a diameter of 2.7 mm or less on a Brinell ball mark while applying stress to the springs at a warm temperature in the range of 150 to 350° C.
Claims8
A production process for highly strengthened springs, the process comprising:
- performing a first shot peening on a spring steel having a hardness of 550 HV or more, corresponding to a diameter of 2.7 mm or less on a Brinell ball mark, while applying stress to the springs at a warm temperature in a range of 150 to 350° C.
A highly strengthened spring obtained by performing a first shot peening on a spring steel having a hardness of 550 HV or more, corresponding to a diameter of 2.7 mm or less on a Brinell ball mark, while applying stress to the spring at a warm temperature in the range of 150 to 350° C.
Dependencies are inferred from the claim text.