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我厂主要产品S195柴油机中的调节螺钉(图1),系连接调速连杆和调速弹簧的小件(M6×40),受拉压的反复应力。在机体振动时,又引起弹簧和φ2.3内孔表面的摩擦,内孔变大,调节误差即增大,导致失效,有的甚至从此处断裂。这种零件用35钢制造,要求φ2.3孔处硬度HRC40～50,并发蓝。我们原来采用GP-100C_2型高频加热淬火,每约10支为一扎地进行感应加热,结果加热不均,操作时稍不小心就被烧伤。众所周知,钢件气体软氮化表层有高的疲劳强度、耐磨性和抗蚀性,软氮化后经机油冷却,可使表面质量与发蓝几乎一样。
The main screwdriver (Figure 1) in S195 diesel engine of our factory is a small piece (M6 × 40) connected with a speed control rod and a governor spring, subject to the repeated stress of tension and compression. In the body vibration, but also caused the spring and φ2.3 hole surface friction, the hole becomes larger, the adjustment error increases, resulting in failure, and some even rupture from here. This part is made of 35 steel, requiring φ2.3 hole hardness HRC40 ~ 50, and blue. We originally used GP-100C_2 type high-frequency heating quenching, each about 10 for induction heating, resulting in uneven heating, the operation was accidentally burned. As we all know, steel gas nitrocarburized surface layer has high fatigue strength, abrasion resistance and corrosion resistance, nitrocarburized by oil cooling, surface quality can make almost the same blue.