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Brake pad and preparation method thereof

A technology of brake pads and raw materials, which is applied in the field of brake pads and its preparation, can solve problems such as low bonding strength, brake pads falling off, and thickening, and achieve good mechanical properties and friction properties, ensure mechanical properties, and high bonding strength.

Active Publication Date: 2017-02-08
SEED TECH CORP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the existing technology, powder metallurgy method is used to prepare brake pads. During the sintering process, due to the different shrinkage coefficients of the components in the brake pads, defects such as pores and thick inclusions are prone to occur, resulting in low density of the brake pads, which affects its final performance. Mechanical properties and friction properties
Moreover, since the brake pad compact and the steel back are sintered together, the shrinkage of the brake pad compact itself is inconsistent with that of the steel back during the sintering process, so that the bonding strength between the two is low, and the brake pad is likely to fall off during use. Case
In addition, the high temperature in the sintering process will change the internal structure of the steel back, affect the mechanical properties of the steel back, and then affect the braking effect of the entire brake pad and brake pair

Method used

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preparation example Construction

[0021] The invention provides a method for preparing a brake sheet, comprising:

[0022] The raw material powder of the brake pad is 3D printed on the surface of the steel back with the metal layer attached to obtain the brake pad;

[0023] The composition of the metal layer is the same as the metal composition in the raw material composition of the brake sheet.

[0024] The present invention has no special restrictions on the types and sources of the raw materials of the brake pads, and the raw materials known to those skilled in the art can be used to prepare the brake pads, such as copper-based, iron-based, nickel-based or titanium-based metal-based brake pads The raw materials are sufficient and can be purchased from the market. In the present invention, the components of the brake pad raw material preferably include:

[0025] 60-68wt% copper;

[0026] 5-8wt% zinc;

[0027] 4~7wt% aluminum;

[0028] 5~8wt% SiO 2 ;

[0029] 3-6wt% lead;

[0030] The balance is graph...

Embodiment 1

[0050] First, the steel back plated with a layer of copper-based powder with a thickness of 0.3mm is placed in the molding cavity of the electron beam powder rapid prototyping system in advance, and the 3D data of the brake pad to be prepared is obtained through the CAD software, and the data is sent to the electronic In the beam powder rapid prototyping system; the composition of the copper-based powder is: 68wt% Cu, 15wt% Zn and 17wt% Al;

[0051] The powder raw material with a particle size of 75 μm was prepared according to 60wt% Cu, 8wt% Zn, 7wt% Al, 5wt% SiO 2 , 6wt% Pb and the rest of the graphite are mixed to obtain a copper-based raw material powder; the copper-based raw material powder is loaded into a feed bin in the electron beam powder rapid prototyping system;

[0052] Spread powder according to the above 3D data, and then use electron beam scanning for selective melting and sintering. The electron beam power during the electron beam scanning process is 1000W-120...

Embodiment 2

[0054] First, the steel back plated with a layer of copper-based powder with a thickness of 0.3mm is placed in the molding cavity of the electron beam powder rapid prototyping system in advance, and the 3D data of the brake pad to be prepared is obtained through the CAD software, and the data is sent to the electronic In the beam powder rapid prototyping system; the composition of the copper-based powder is: 75wt% Cu, 18wt% Zn and 7wt% Al;

[0055] The powder raw material with a particle size of 75 μm, according to 65wt% Cu, 6wt% Zn, 5wt% Al, 6wt% SiO 2 , 5wt% Pb and the rest of the graphite are mixed to obtain copper-based raw material powder; the obtained copper-based raw material powder is packed into a feed bin in the electron beam powder rapid prototyping system;

[0056] Spread powder according to the above 3D data, and then use electron beam scanning to carry out selective sintering. s, the thickness of the layer is 0.12mm, and the scanning interval is 0.15mm; the copp...

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Abstract

The invention provides a preparation method of a brake pad. The preparation method comprises the step of carrying out 3D printing on the surface attached with a metal layer, of a steel backing, by virtue of a raw material powder of the brake pad to obtain the brake pad, wherein the components of the metal layer are the same as metal components in the raw material components of the brake pad. According to the preparation method provided by the invention, a high-power electron beam enables the components in the material of the brake pad to be adequately reacted during a 3D printing process, so that the obtained brake pad has high mechanical performance and functional performance; and moreover, the steel backing with the surface attached with the metal layer having the components the same as the metal components in the raw materials of the brake pad is adopted, the metal layer is molten to form a thin molten bath under the scanning of the high-power electron beam during the 3D printing process, and adequate metallurgical bonding is carried out between the molten bath and the raw material powder of the brake pad, so that a wear-resistant layer in the brake pad and the steel backing have a high bonding strength. In addition, the power of the electron beam scans on the raw material powder of the surface of the steel backing during the 3D printing process, without influence on the organizational structure of the interior of the steel backing, thus the own mechanical performance of the steel backing is ensured.

Description

technical field [0001] The invention relates to the technical field of brake devices, in particular to a brake pad and a preparation method thereof. Background technique [0002] Brake pads are the key material in the braking device of high-speed train sets. The kinetic energy of high-speed train sets is converted into heat or other forms of energy by using the friction between the brake pad material and the matching brake disc material, and then dissipated into the air. According to different materials, brake pads can be divided into synthetic brake pads, composite material brake pads and powder metallurgy brake pads. The synthetic brake pads used in early high-speed trains have low mechanical strength, poor impact toughness, and large wear, and micro-cracks will appear in the brake pads during operation, and this brake pad material is sensitive to water. When running in wet areas, the friction of the material will be reduced due to the dampness of the brake pads, which wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/105B22F7/08B22F7/04B22F1/00C22C9/00C22C32/00C22C9/04C22C9/01C22C9/08B33Y10/00B33Y80/00
CPCB22F1/0003C22C9/00C22C9/01C22C9/04C22C9/08C22C32/0084B22F7/04B22F7/08B33Y10/00B33Y80/00B22F10/00B22F10/36B22F10/25B22F10/28Y02P10/25
Inventor 徐跃华
Owner SEED TECH CORP LTD
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