Preparing method of brake pad friction block

A friction pad and brake pad technology, applied in the field of brake pads, can solve the problem of easy deformation of brake friction pads, and achieve the effects of optimizing the process system, improving hot brittleness, and uniform grain refinement

Active Publication Date: 2016-08-24
WUHU DONGZHENG AUTOMOTIVE IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, at present, the brake friction blocks in automobile brake pads need to absorb more and more braking energy, and the temperature can be as high as 700°C, which will cause problems such as deformation of the brake friction blocks.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The method for preparing a brake pad friction block provided by the present invention includes the following steps:

[0034] S1. The raw material is heated to a molten state in an argon atmosphere, and then vacuum-preserved to obtain the first material. The first material includes C: 1.0%, Si: 0.4%, Mn: 0.35%, and Ni: 0.10% by weight. , W: 0.03%, Nb: 0.06%, Zr: 0.008%, Cr: 2.8%, Ti: 0.2%, Co: 0.05%, Mo: 0.02%, B: 0.09%, Ce: 0.07%, S≤0.015% , P≤0.015%, the balance is Fe;

[0035] S2. Take the first material out of the furnace for pouring, cool to 395°C, and perform surface machining to obtain the second material;

[0036] S3. Raise the second material to 1120℃ for austenitization, then keep it for 3.5h, take it out and place it in a nitrate bath with a temperature of 220℃, heat it up to 378.3℃, keep it for 4h, oil cool it to 120℃, then heat it up Perform tempering at 222.1°C, heat preservation for 1 hour, and air-cool to room temperature to obtain brake pad friction blocks.

Embodiment 2

[0038] The method for preparing a brake pad friction block provided by the present invention includes the following steps:

[0039] S1. The raw material is heated to a molten state in an argon atmosphere, and then vacuum insulation is used to obtain the first material, wherein the first material includes: C: 1.3%, Si: 0.3%, Mn: 0.45%, Ni: 0.07% by weight percentage , W: 0.05%, Nb: 0.05%, Zr: 0.012%, Cr: 2.5%, Ti: 0.3%, Co: 0.04%, Mo: 0.03%, B: 0.06%, Ce: 0.10%, S≤0.015% , P≤0.015%, the balance is Fe;

[0040] S2. Take the first material out of the furnace for pouring, cool to 375°C, and perform surface machining to obtain the second material;

[0041] S3. Raise the second material to 1148℃ for austenitization, then keep it warm for 4.5h, take it out and place it in a nitrate bath at 200℃, raise it to 380.2℃, keep it for 5h, oil cooling to 100℃, then heat it up Tempering at 224°C, heat preservation for 2 hours, air cooling to room temperature to obtain brake pad friction blocks.

Embodiment 3

[0043] The method for preparing a brake pad friction block provided by the present invention includes the following steps:

[0044] S1. The raw material is heated to a molten state in an argon atmosphere, and then vacuum insulation is used to obtain the first material. The first material includes C: 1.1%, Si: 0.36%, Mn: 0.38%, and Ni: 0.09% by weight. , W: 0.035%, Nb: 0.058%, Zr: 0.009%, Cr: 2.7%, Ti: 0.23%, Co: 0.046%, Mo: 0.022%, B: 0.08%, Ce: 0.08%, S≤0.015% , P≤0.015%, the balance is Fe;

[0045] S2. Take the first material out of the furnace for pouring, cool to 390°C, and perform surface machining to obtain the second material;

[0046] S3. Raise the second material to 1122.7°C for austenitization, then keep it for 3.8h, take it out and place it in a nitrate bath at 215°C, heat it up to 377.3°C, keep it for 4.2h, and cool it to 115°C with oil. The temperature is raised to 222.7°C for tempering, the temperature is kept for 1.2h, and the brake pad friction block is obtained by ...

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Abstract

The invention discloses a preparing method of a brake pad friction block. The preparing method comprises the steps that raw materials are subject to temperature rising in argon atmosphere to be in a molten state, and vacuum heat preservation is carried out, so that a first material is obtained; the first material is out of a furnace to be casted, the first material is cooled to 375 DEG C to 395 DEG C, and surface machining is carried out to obtain a second material; the second material is subject to temperature rising to reach Ta DEG C, austenitizing is carried out, heat preservation is carried out, the second material is taken out to be placed in a nitrate bath at he temperature of 200 DEG C to 220 DEG C, the material is subject to temperature rising to reach Tb DEG C, heat preservation is carried out, the material is subject to oil cooling to 100 DEG C to 120 DEG C, the material is subject to temperature rising to Tc DEG C to be tempered, heat preservation is carried out, and the second material is subject to air cooling to the room temperature to obtain the brake pad friction block; and Ta=1050+Ka*(nCo+nMo)/nNb, the value of Ka ranges from 60 to 70, Tb=355+Kb*(nCo+nMo)/nNb, the value of Kb ranges from 18 tp 20, Tc=200+Kc*100*(nNb+nCo+nMo), and the value of Kc ranges from 170 to 200.

Description

Technical field [0001] The invention relates to the technical field of brake pads, in particular to a method for preparing a brake pad friction block. Background technique [0002] Automobile brake pads have a vital influence on the safety and reliability of automobile operation and are one of the most important parts of automobiles. [0003] At present, foreign automobile brake pads mostly use resin-based friction linings, and their use temperature is generally not higher than 250 ℃. Excessive temperature will cause the aging and cracking of the resin matrix of the friction linings, which will increase the wear rate of the friction linings sharply and the friction coefficient. big change. Nowadays, the metal matrix composite friction sheet prepared by powder metallurgy is commonly used, which has the advantages of good thermal conductivity, low temperature rise of the friction pair, and high allowable temperature. The use temperature of powder metallurgy brake materials is relat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/32C22C38/02C22C38/04C22C38/10C22C38/08C22C38/12C22C38/14C22C38/18C21D1/20C21D6/00
CPCC21D1/20C21D6/001C21D6/005C21D6/007C21D6/008C21D2211/001C21D2211/002C22C38/005C22C38/02C22C38/04C22C38/105C22C38/12C22C38/14C22C38/18C22C38/32
Inventor 杨国军
Owner WUHU DONGZHENG AUTOMOTIVE IND
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