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Manufacturing method of brake drum, and brake drum

A manufacturing method and technology of brake drums, applied in the direction of manufacturing tools, brake drums, casting molding equipment, etc., can solve the problems of increasing the total weight of the braking system, endangering the safety of vehicles, and poor thermal fatigue resistance, etc., and achieve a good social benefits, overall weight reduction, and strength-enhancing effects

Pending Publication Date: 2018-06-29
GUANGDONG FUHUA CASTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing brake drums are generally made of gray cast iron, and gray cast iron has poor thermal fatigue resistance, which can easily cause the brake drum to crack, cause the brake system to break down, and directly endanger the driving safety of the vehicle.
[0004] In addition, the weight of the existing brake drum is relatively heavy, which not only increases the total weight of the brake system, but also requires more cast iron materials, which increases the casting cost. Therefore, the strength and mechanical properties of the brake drum are not affected. Under the premise, it is becoming more and more urgent to realize the light weight of the brake drum; the installation hole of the existing brake drum is not directly completed by integral casting, and needs to be processed twice, which increases the processing procedure and affects the production efficiency. It also increases the processing cost

Method used

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  • Manufacturing method of brake drum, and brake drum
  • Manufacturing method of brake drum, and brake drum

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] A method for manufacturing a brake drum provided by the present invention, as well as the manufacture of the brake drum of this embodiment, all include the following steps:

[0049] S1. Preparation of raw materials:

[0050] The following materials are prepared according to mass percentage: 30% of pig iron, 60% of steel scrap, 10% of recycled materials; molybdenum and copper are added, and their mass is equivalent to 0.25-0.5% and 0.4-0.8% of the total mass of the raw materials.

[0051] The mass of molybdenum added in this embodiment is equivalent to 0.25% of the total mass of the raw materials.

[0052] The mass of copper added in this embodiment is equivalent to 0.5% of the total mass of the raw materials.

[0053] The percentage of molybdenum and copper added in this embodiment to the total mass of the raw materials is the best implementation mode, which can make the creep rate of molten iron reach the highest, and improve the thermal fatigue resistance and mechani...

Embodiment 2

[0075] The manufacturing method of the brake drum of this embodiment is substantially the same as the manufacturing method of the brake drum of Embodiment 1, the difference is that, in the S1 of this embodiment, the mass of molybdenum added is equivalent to the total mass of the raw materials 0.3%, the quality of adding copper is equivalent to 0.4% of the total mass of the raw materials.

[0076] The tapping temperature of the molten iron in S2 in this embodiment is 1480°C.

[0077] The pouring temperature in S3 of this embodiment is 1390°C.

[0078] The structure of the brake drum in this embodiment is the same as the structure of the brake drum in Embodiment 1.

Embodiment 3

[0080] The manufacturing method of the brake drum of this embodiment is substantially the same as the manufacturing method of the brake drum of Embodiment 1, the difference is that, in the S1 of this embodiment, the mass of molybdenum added is equivalent to the total mass of the raw materials 0.5%, the quality of adding copper is equivalent to 0.8% of the total mass of the raw materials.

[0081] The tapping temperature of the molten iron in S2 in this embodiment is 1520°C.

[0082] The pouring temperature in S3 of this embodiment is 1400°C.

[0083] The structure of the brake drum in this embodiment is the same as the structure of the brake drum in Embodiment 1.

[0084] Compared with the prior art, the manufacturing method of the brake drum of the present invention carries out integrated casting on the brake drum, reduces secondary processing, reduces processing steps and costs; the brake drum produced by it is a vermicular graphite cast iron brake drum, Vermicular graphit...

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Abstract

The invention relates to a manufacturing method of a brake drum. The manufacturing method comprises the following steps: step (S1) preparing raw materials; step (S2) smelting; step (S3) performing vermicularizing treatment; step (S4) pouring; and step (S5) performing cooling formation. According to the manufacturing method of the brake drum provided by the invention adopts integrated casting for the brake drum, reduces secondary machining, reduces machining procedures and lowers the machining cost; compared with a gray pig iron brake drum having the same structure, the brake drum manufacturedby the manufacturing method can be prolonged by 50% to 100% in service life. The invention also discloses the brake drum; the brake drum comprises a brake drum body and a mounting part; the mounting part is annular and is arranged at one end of the brake drum body; the mounting part is provided with a plurality of mounting holes which are in circumferential array distribution; lightening holes areformed in a spaced manner among the plurality of mounting holes; a friction part is arranged at the inner wall of the brake drum body; and an annular reinforcing ring is arranged at the outer wall ofthe brake drum body. The brake drum provided by the invention has the advantages of being simple in structure, light in weight, high in strength and the like.

Description

technical field [0001] The invention relates to the field of brake drums, in particular to a method for manufacturing a brake drum and the brake drum. 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 drums are generally ...

Claims

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Application Information

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IPC IPC(8): C22C37/00C22C33/08B22C9/22F16D65/10
CPCF16D65/10C22C33/08C22C37/00B22C9/22F16D2250/0007F16D2250/003F16D2200/0021
Inventor 吴志强郭维伟
Owner GUANGDONG FUHUA CASTING
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