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在履带车辆中制动鼓是转向制动器的重要零件,我厂仿制的501车中制动鼓为20Cr2Ni4A钢制,经2000多公里跑车后,外侧的摩擦面发现了2～5mm长的裂纹数条。裂纹呈直线状。垂直于摩擦痕(见图1)。裂纹部位是7×30°斜面,端面厚5mm。制动鼓摩擦面厚10mm,表面被磨削约1 mm,轮缘20～30μ的镀锌层呈可剥落的黑焦壳
In the tracked vehicle, the brake drum is an important part of the steering brake. The brake drum of the 501 car imitated by our factory is made of 20Cr2Ni4A steel. After more than 2000 km of sports car, the outer friction surface has found 2 ~ 5mm long cracks . Cracks linear. Perpendicular to the friction marks (see Figure 1). Crack site is 7 × 30 ° bevel, the end thickness 5mm. Brake drum friction surface thickness of 10mm, the surface is about 1mm grinding, rim 20 ~ 30μ galvanized layer was peelable black coke shell