Manufacturing method of high-strength light bi-metal brake drum and high-strength light bi-metal brake drum thereof

Abstract

A manufacturing method of a high-strength light bi-metal brake drum includes the following steps: (a) blanking steel plates; (b) punching; (c) spinning, spinning an external edge of a semi-finished product obtained from the former step to be a cylindrical outer ring having a plurality of convex rings; (d) roll spinning, forming uniformly distributed inwards concave parts on an inner wall of the convex ring of the semi-finished product through roll spinning; (e) casting, casting a iron casting lining in the semi-finished product by a centrifugal casting method; (f) heat treatment, eliminating inner stress and enabling the iron casting lining to achieve a rigidity demanded by the brake drum; (g) processes of finish machining and the like. The bi-metal brake drum manufactured by the method can directly transmit a brake moment between the iron casting lining and a steel housing, fixing pieces, such as a bolt or a rivet and the like, are unnecessary for assembling the outer ring and the lining of the brake drum, and service life of the brake drum is prolonged; simultaneously, an originally designed structure combination of a drum disc, the lining and a thin wall of the outer ring is not changed, so that phenomena of crack caused by too thick drum wall and too much temperature difference are reduced, and braking conditions are improved.

Description

technical field [0001] The invention relates to a manufacturing method of auto parts, a manufacturing method of a high-strength and lightweight bimetal brake drum and the metal brake drum. Background technique [0002] The traditional one-piece cast drum brake is widely used in trucks at present. The brake is mainly composed of a brake drum and a brake shoe. It uses frictional resistance to convert the kinetic energy of the car into heat energy, thereby slowing down or driving the car. Stop to ensure safe driving. When the car is heavy-loaded and driving at high speed, especially when going down a long or steep slope, due to the large braking force and multiple consecutive brakings, the temperature of the inner wall of the brake drum rises sharply, and the temperature difference between the inside and outside increases, and the material of the brake drum The high temperature mechanical properties also drop sharply. The thicker the brake drum wall, the greater the temperatu...

AI Technical Summary

Problems solved by technology

However, because it transmits torque to the drum disc through the outer ring of the brake drum, the torque transmitted by the joint surface of the outer ring and the inner lining is relatively large, which may easily cause the outer ring to slide relative to the inner lining and the stress of the inner lining at the joint of screws or rivets Concentrated cracking affects the braking effect and reduces the service life of the brake drum

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