Impeller flange type steel brazing brake drum and preparing method thereof

Abstract

The invention discloses a method for preparing an impeller flange type steel brazing brake drum. The method includes the following steps that a brake drum sleeve is manufactured; under the condition that the rotating speed of the brake drum sleeve is 200 r/min-300 r/min, brazing filler metal is sprayed to the inner surface of the brake drum sleeve, molten iron is paved and injected into the innersurface of the brake drum sleeve, the brazing filler metal and the molten iron form alloy cast iron on the inner surface of the brake drum sleeve, and then cooling is carried out to obtain the room temperature; the brazing filler metal is prepared by mixing sodium tetraborate decahydrate, copper powder and silicon iron powder according to the using amount ratio being (1.5-2.5): (1.5-2.5): (0.8-1.2); and a double-layer flange is arranged on the outer circumference of the brake drum sleeve, and welding is carried out. Meanwhile, a corresponding brake drum is provided. According to the method, the brazing technology is used for manufacturing the brake drum, the brazing filler metal is coated to the inner surface of the brake drum sleeve, the temperature of the molten iron is used for heatingthe brazing filler metal and the brake drum sleeve, sodium borate and copper powder are firstly fused and permeate and diffuse to a steel junction surface, then the silicon iron powder fuses, permeates and diffuses to form metallurgical bonding, the compact and firm junction surface is formed, and the steel and iron combination quality is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of brake accessories, and in particular relates to an impeller flange type steel brazing brake drum and a preparation method thereof. Background technique [0002] Due to the technological breakthroughs of large tonnage, high speed, and long-term continuous driving of current vehicles, traditional pure gray iron brake drums often have problems such as bottoming (transverse fracture) and bursting (longitudinal cracking) in use. In order to solve the above problem, steel composite / combination brake drums have emerged that can replace pure gray iron brake drums. Although the steel composite / combined brake drum has solved the problem of bottom drop (transverse fracture), its structure has not got rid of the structural form of the traditional brake drum. In the actual use process, the problem of bursting (longitudinal cracking) still occurs. With the gradual development of automobiles towards lightweight, the we...

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Problems solved by technology

[0002] Due to the technological breakthroughs of large tonnage, high speed, and long-term continuous driving of current vehicles, traditional pure gray iron brake drums often have problems such as bottoming (transverse fracture) and bursting (longitudinal cracking) in use. In order to solve the above problem, there are steel composite / combined brake drums that can replace pure gray iron brake drums

Although the steel composite / combined brake drum has solved the problem of bottom drop (transverse fracture), its structure has not got rid of the structural form of the traditional brake drum. In the actual use process, the problem of bursting (longitudinal cracking) still occurs. With the gradual development of automobiles towards lightweight, the weight reduction of brakes has become the focus of attention

Due to the constraints of the traditional structure, the above two brake drums have no room for weight reduction. This is because the strength is not enough if the weight is reduced, which further increases the risk of cracking

[0003] The new steel composite brake drum is formed by traditional centrifugal casting. Although the combination of steel and steel has been achieved, the problems of pores, slag inclusions, metallography and carbide out of control in the bonding layer are still limited by the process, which has a certain impact on subsequent use.

[0004] Furthermore, studies have shown that the root cause of brake drum cracking and bottoming is due to high temperature fatigue failure. Whether it is a traditional brake drum or a new steel composite brake drum, due to structural limitations, the heat dissipation effect is not ideal

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