At present, the crankshaft processing technology commonly used by some professional crankshaft manufacturers in China is: blank preparation - normalizing treatment - machining - surface strengthening treatment - super finishing. Our factory has used the above process for many years, and the surface strengthening method is glow ion nitriding. In the years of production practice, it was found that the crankshafts which were machined according to the above process, especially the longer crankshafts with more than six cylinders, had a large bending deformation after nitriding, and the radial runout of the intermediate journal was measured at 0.1 spindle neck support. ~ 0.35mm or so. In this way,
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