Composite brake drum and preparation method thereof

Abstract

The invention discloses a composite brake drum and a preparation method thereof. The composite brake drum comprises an outer shell base body and an inner-layer reinforcement body, the inner-layer reinforcement body is arranged on the inner wall of the outer shell base body in the circumferential direction, the outer shell base body is made of alloy steel plates, and the inner-layer reinforcement body is a vermicular graphite cast iron composite layer. According to the composite brake drum and the preparation method thereof, an existing brake drum structure is changed, the outer shell base bodyand the inner-layer reinforcement body are adopted for composite reinforcement, in addition, the inner-layer reinforcement body adopts the vermicular graphite cast iron composite layer, so that the composite brake drum has a specific graphite structure and performance and has an expansion coefficient similar to that of a steel flange outer shell, and therefore better anti-fatigue performance is achieved. The invention further discloses the preparation method for the composite brake drum, which has the advantages that the vermicular graphite cast iron composite layer is compounded on the innerside of the outer shell base body, namely a steel flange shell, in a centrifugal casting mode, so that compared with a traditional composite brake drum, the composite brake drum has the advantages ofbeing not liable to delaminating or cracking and longer in service life.

Description

technical field [0001] The invention relates to the technical field of brake drums, and specifically discloses a composite brake drum and a preparation method thereof. Background technique [0002] The brake drum is the main braking element in the axle braking system. When the car is braking, the braking force is generated by the friction between the brake pads and the inner wall of the brake drum. The friction between the inner wall of the brake drum and the brake pads produces the braking effect. During the friction process, heat will be generated. During the friction process and after the friction is stopped, different parts of the brake drum will also alternate between cold and heat. The moving drum has good wear resistance, thermal conductivity and thermal fatigue resistance. [0003] According to statistics, at present, brake drum cracking accounts for more than 80% of the failure cases, and the cracking is mainly caused by thermal fatigue cracks. Existing brake dru...

AI Technical Summary

Problems solved by technology

This invention mainly solves the problem of heat dissipation after the temperature of the inner wall of the brake drum rises sharply, and improves the safety and service life of the brake drum by using a hoop sleeve, and does not involve the composite brake drum in the present invention, let alone Mentions of delamination or cracking of composite brake drums

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