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    • 2. 发明授权
    • High-strength valve spring and it's manufacturing method
    • 高强度阀门弹簧及其制造方法
    • US06224686B1
    • 2001-05-01
    • US09256300
    • 1999-02-24
    • Toshinori AokiMasami WakitaTakayuki Sakakibara
    • Toshinori AokiMasami WakitaTakayuki Sakakibara
    • C21D902
    • C22C38/18C21D1/18C21D7/06C21D8/06C21D9/02C22C38/02Y10S148/908
    • The high-strength valve spring uses, as the material, a steel containing 0.5-0.8% C, 1.2-2.5 wt % Si, 0.4-0.8 wt % Mn, 0.7-1.0 wt % Cr, balance Fe and inevitable impurities, where, in the inevitable impurities, Al is no more than 0.005 wt % and Ti is no more than 0.005 wt %, and the largest non-metallic inclusion is 15 &mgr;m. In the oil tempering treatment, the heating temperature at hardening is between 950-1100° C., and nitriding treatment is performed after coiling. It is preferable to nitride at a temperature no lower than 480° C. Since the material is a high-silicon steel, the tempering temperature can be set at a higher temperature, and the nitriding temperature can be so high. In another way, after coiling, the spring is subjected to shot peening at least twice with shot particles of hardness 720 Hv or higher to produce a compressive residual stress of 85 kgf/mm2 at around surface. These measures render high surface hardness, and produce high-strength valve springs having good fatigue strength, sag resistance and delayed fracture resistance.
    • 高强度阀弹簧使用含有0.5-0.8%C,1.2-2.5重量%Si,0.4-0.8重量%Mn,0.7-1.0重量%Cr,余量Fe和不可避免的杂质的钢,其中, 在不可避免的杂质中,Al不大于0.005重量%,Ti不大于0.005重量%,最大的非金属夹杂物为15μm。 在回火处理中,硬化时的加热温度为950〜1100℃,卷取后进行氮化处理。 优选在不低于480℃的温度下进行氮化。由于该材料是高硅钢,回火温度可以设定在较高的温度,并且氮化温度可以如此高。 另一方面,在卷取之后,弹簧用高达720Hv或更高的喷射粒子进行喷丸硬化至少两次,以在表面附近产生85kgf / mm2的压缩残余应力。 这些措施具有高的表面硬度,并且生产出具有良好疲劳强度,抗流挂性和延迟抗断裂性的高强度气门弹簧。