A preparation method of high-hardness friction block for brake pads

A high-hardness friction block and brake pad technology, applied in the field of brake pads, can solve the problem of easy deformation of brake friction blocks and other problems

Active Publication Date: 2018-01-05
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

[0029] A kind of preparation method that the present invention proposes is used for the high-hardness friction block of brake pad, comprises the following steps:

[0030] S1. The raw material is heated to a molten state in an argon atmosphere, and then vacuum-insulated to obtain a material a, wherein the material a includes by weight percentage: C: 0.6%, Si: 0.4%, V: 0.2%, W: 0.10%, Nb : 0.05%, Zr: 0.04%, Cr: 3.3%, Ti: 0.005%, Sc: 0.003%, Bi: 0.008%, B: 0.09%, Y: 0.10%, S≤0.015%, P≤0.015%, Yu The amount is Fe;

[0031] S2. Take material a out of the furnace for pouring, cool to 400° C., and perform surface machining to obtain material b;

[0032] S3. Raise the temperature of material b to 1130.94°C for austenitization, then keep it warm for 4 hours, take it out and place it in a nitrate bath with a temperature of 220°C, raise the temperature to 367.2°C, and hold it for 5 hours to obtain a high-hardness friction block for brake pads.

Embodiment 2

[0034] A kind of preparation method that the present invention proposes is used for the high-hardness friction block of brake pad, comprises the following steps:

[0035] S1. The raw material is heated to a molten state in an argon atmosphere, and then vacuum-insulated to obtain a material a, wherein the material a includes by weight percentage: C: 0.9%, Si: 0.3%, V: 0.3%, W: 0.07%, Nb : 0.08%, Zr: 0.03%, Cr: 3.6%, Ti: 0.002%, Sc: 0.006%, Bi: 0.005%, B: 0.09%, Y: 0.07%, S≤0.015%, P≤0.015%, Yu The amount is Fe;

[0036] S2. Take material a out of the furnace for pouring, cool to 500° C., and perform surface machining to obtain material b;

[0037] S3. Raise the temperature of material b to 1166.90°C for austenitization, then keep it warm for 3 hours, take it out and place it in a nitrate bath with a temperature of 230°C, raise the temperature to 373°C, and hold it for 4 hours to obtain a high-hardness friction block for brake pads.

Embodiment 3

[0039] A kind of preparation method that the present invention proposes is used for the high-hardness friction block of brake pad, comprises the following steps:

[0040] S1. The raw material is heated to a molten state in an argon atmosphere, and then vacuum-insulated to obtain a material a, wherein the material a includes by weight percentage: C: 0.7%, Si: 0.34%, V: 0.22%, W: 0.09%, Nb : 0.06%, Zr: 0.036%, Cr: 3.4%, Ti: 0.004%, Sc: 0.004%, Bi: 0.007%, B: 0.07%, Y: 0.09%, S≤0.015%, P≤0.015%, Yu The amount is Fe;

[0041] S2. Take material a out of the furnace for pouring, cool to 450° C., and perform surface machining to obtain material b;

[0042] S3. Raise the temperature of material b to 1148.35°C for austenitization, then keep it warm for 3.6 hours, take it out and place it in a nitrate bath with a temperature of 225°C, raise the temperature to 368.54°C, and hold it for 4.5 hours to obtain high hardness friction for brake pads piece.

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Abstract

The invention discloses a preparation method for a high-hardness friction block for a brake pad. The preparation method comprises the following steps of raising the temperature of raw materials in the argon atmosphere until a molten state, and then carrying out vacuum heat preservation to obtain a material a; discharging the material a, pouring, cooling to 400-500 DEG C, and carrying out surface machining to obtain a material b; raising the temperature of the material b to T1 DEG C, austenitizing, then carrying out heat preservation for 3-4h, taking out, putting in a nitrate bath with the temperature to be 220-230 DEG C, raising the temperature to T2 DEG C, and carrying out heat preservation for 4-5h to obtain the high-hardness friction block for the brake pad, wherein T1=1100+K1x240x110x(nC+nW+nZr) / 28.7, T2=345+K2x100x(nC+nW+nZr), a value of K1 is 5-8, a value of K2 is 28-30, and nC, nW and nZr express the weight percentages of carbon element, tungsten element and zirconium element occupied in the material a respectively.

Description

technical field [0001] The invention relates to the technical field of brake pads, in particular to a method for preparing a high-hardness friction block used for brake pads. Background technique [0002] Automobile brake pads have a vital impact 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 pads, and their operating temperature is generally not higher than 250°C. If the temperature is too high, the resin matrix of the friction pads will age and crack, which will cause a sharp increase in the wear rate of the friction pads and a significant increase in the friction coefficient. big change. Metal matrix composite material friction plates prepared by powder metallurgy are widely used now, which have the advantages of good thermal conductivity, low temperature rise of friction pairs, and high allowable temperature. The use tempera...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/18C22C38/02C22C38/12C22C38/14C21D1/20
CPCC21D1/20C21D2211/001C21D2211/002C22C38/002C22C38/005C22C38/02C22C38/12C22C38/14C22C38/18C22C38/32
Inventor 杨国军
Owner WUHU DONGZHENG AUTOMOTIVE IND
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