Production method of alloy steel brake drums

A production method and brake drum technology, which is applied in the production field of alloy steel brake drums, can solve the problems of high hardness, high pearlite of automobile brake hubs, abnormal noise and vibration, etc., to reduce martensitic transformation and improve exhaust The purity of slag and the effect of reducing impurities

Inactive Publication Date: 2017-03-22
CHONGQING SHUAIBANG MACHINERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the traditional automobile brake drum casting process, in addition to the original materials containing carbon, silicon, manganese, phosphorus, sulfur, and elements, chromium, vanadium, and titanium are newly added during gray cast iron smelting. After melting, pouring, and molding , annealing, sand cleaning, and mechanical processing. The automobile brake hub produced by this method has high pearlite and high hardness. In use, it is easy to crack prematurely, especially in the braking process, it is easy to produce abnormal noise and Defects such as jitter

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0025] Embodiment 2: all the other are the same as embodiment 1, except that the amount of carbon added in the step (2) is 0.75% of the total amount of molten steel, the smelting time is 1.2h, and the slagging temperature in the step (3) is 1020° C., the step The secondary smelting temperature in (4) is 1500°C, the smelting time is 1.2h, the molten steel temperature in step (5) is 1475°C, the polishing time in step (6) is 23min, and the painting time is 40min.

Embodiment 3

[0026] Embodiment 3: all the other are the same as embodiment 1, except that the amount of carbon added in the step (2) is 1% of the total amount of molten steel, the smelting time is 1.5h, and the slagging temperature in the step (3) is 1050° C., the step The secondary melting temperature in (4) is 1550°C, the melting time is 1.5h, the molten steel temperature in step (5) is 1500°C, the polishing time in step (6) is 25min, and the painting time is 45min.

[0027] According to the above steps, the strength of the product obtained by the present invention reaches 262-300Mpa, the hardness of the braking surface reaches more than 210HB, the service life of the vehicle is more than 90,000 kilometers, and the number of fatigue tests reaches more than 5,000 times. The performance is relatively good, and the shock absorption performance Well, it is less prone to brake slippage, which improves the smoothness and safety of braking. It can be used in automobiles for a long time, and the...

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Abstract

The invention discloses a production method of alloy steel brake drums, and relates to the field of production technologies of automobile components. The method comprises the steps of molten steel raw material preparation, primary melting and carbon addition, material addition and slag removal, secondary melting, cast molding and stirring, and post-treatment. A small amount of chromium is added to realize graphite refinement, ferrite is reduced, and pearlite is increased; and small amounts of the molybdenum element and the copper element are added in the production process, so martensite transformation in the structure is reduced, white shading occurrence is prevented, brake slipping does not appear easily, a hard phase is avoided, and the stability and the safety of brakes are improved, thereby the method is worthy to be promoted.

Description

technical field [0001] The invention relates to the field of production technology of auto parts, in particular to a production method of an alloy steel brake drum. Background technique [0002] A brake drum is a device that has the functions of slowing down, stopping or keeping a moving part in a stopped state; it is a mechanical part that can stop or slow down a moving part in a machine. Brake drums can be divided into two categories, industrial brake drums and automotive brake drums. Automobile brake drums are further divided into service brake drums, parking brake drums and balanced booster brake drums. In the process of driving, a new type of balanced booster brake drum is generally used, because the balance booster brake drum cooperates with the spiral groove brake drum during driving to keep the car in a balanced state during the entire driving, and the stability of the brake It is also the best one in the field of automobile brake drums at present, especially for t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/06
CPCC22C33/006C22C33/06
Inventor 彭艳华
Owner CHONGQING SHUAIBANG MACHINERY CO LTD
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