Preparation method of powder metallurgy brake pad friction block for high-speed train

A technology of powder metallurgy and high-speed trains, applied in friction linings, chemical instruments and methods, mechanical equipment, etc., can solve the problems of increased production cost of friction blocks, high price of friction block raw materials, poor wear resistance of friction blocks, etc., to achieve The effect of low production cost, moderate hardness, high crack resistance and wear resistance

Active Publication Date: 2017-12-08
山东百德瑞轨道交通科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing friction block preparation method is relatively cumbersome, the production process takes a long time, and the price of raw materials for preparing the friction block is generally high, whic

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0017] Example one

[0018] The preparation method of powder metallurgy brake pad friction block for high-speed train proposed by the present invention includes the following steps:

[0019] S1. Place the friction block raw materials in a drying equipment for drying operation, and then take the corresponding parts by weight of the raw materials and place them in the mixer. During the mixing process, add the raw materials and mix for 300 minutes to obtain mixed friction block powder. Including the following raw materials in weight percentage: Fe20%, MoS 2 2%, graphite 15%, chromite powder 10%, hematite powder 10%, mullite powder 3%, Cu 40%;

[0020] S2. Prepare the friction block semi-finished product, place the mixed friction block powder obtained in step S1 in an automatic powder press for molding and pressing, and control the pressure to 300 MPa and the pressure holding time to 60 seconds;

[0021] S3. Put the pressed friction block together with the steel back and the welding piec...

Example Embodiment

[0022] Example two

[0023] The method for preparing powder metallurgy brake pad friction blocks for high-speed trains provided by the present invention includes the following steps:

[0024] S1. Put the friction block raw materials in a dryer for drying operation, and then take the corresponding parts by weight of the raw materials and place them in the mixer for 300 minutes to obtain mixed friction block powder. The friction block includes the following weight percentages Raw material: Fe15%, MoS 2 1%, graphite 14%, chromite powder 5%, hematite powder 10%, mullite powder 5%, Cu 50%;

[0025] S2, prepare a semi-finished product of friction block, place the mixed friction block powder obtained in step S1 in an automatic powder press for molding and pressing, and control the pressure to 500MPa and the pressure holding time to 30s;

[0026] S3. Put the friction block pressed in step S2 together with the steel back and the welding piece into an atmosphere sintering furnace for sintering...

Example Embodiment

[0027] Example three

[0028] The preparation method of powder metallurgy brake pad friction block for high-speed train proposed by the present invention includes the following steps:

[0029] S1. Put the friction block raw materials in a dryer for drying operation, then take the corresponding parts by weight of the raw materials and place them in the mixer, and mix the materials for 300 minutes to obtain mixed friction block powder. The friction block includes the following weight percentages Raw material: Fe20%, MoS 2 2%, graphite 15%, chromite powder 10%, hematite powder 8%, mullite powder 10%, Cu 35%;

[0030] S2. Prepare the friction block semi-finished product, place the mixed friction block powder obtained in step S1 in an automatic powder press for molding and pressing, and control the pressure to 200 MPa and the pressure holding time to 60 seconds;

[0031] S3. Put the friction block pressed in step S2 together with the steel back and the welding piece into an atmosphere sin...

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Abstract

The invention discloses a preparation method of a powder metallurgy brake pad friction block for a high-speed train. The preparation method comprises the following steps that 1, friction body raw materials are placed into a drying machine to be dried, the corresponding weight parts of raw materials are placed into a mixing machine to be mixed, the mixture is transferred into an ultrasonic apparatus for ultrasonic treatment, and mixed friction body powder is obtained, wherein the friction body is prepared from Cu, Fe, MoS2, graphite, chromite powder, hematite powder and mullite powder; 2, the mixed friction body powder obtained in the step 1 is placed into an automatic powder pressing machine to be pressed and formed; and 3, the pressed friction block, a steel back and a welding pad are placed into an atmosphere sintering furnace to be sintered, and therefore the finished product is obtained. According to the preparation method, the process is simple, operation is easy, the cost is low, the prepared brake pad friction block is stable in friction performance, the friction coefficient can reach 0.35 or above, the abrasion rate is low, the hardness is moderate, cracking resistance and wear resistance are high, and the service life is long.

Description

technical field [0001] The invention relates to the technical field of powder metallurgy brake pads for high-speed trains. The invention relates to the field of powder metallurgy friction materials, in particular to a method for preparing powder metallurgy brake pad friction blocks for trains with a maximum speed of 250 km / h. Background technique [0002] With the development of science and technology, China's rail transit technology is becoming more and more developed, and the number of high-speed rail and bullet trains used in the market is also increasing. Brake pads are key components and consumable parts of high-speed train braking systems. There are two types of brake pads commonly used at present: powder metallurgy materials and synthetic materials. Synthetic materials are not suitable for the braking requirements of high-speed trains due to their low strength, poor heat resistance, and severe thermal degradation; powder metallurgy friction materials are due to their ...

Claims

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Application Information

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IPC IPC(8): F16D69/02C09K3/14
CPCF16D69/027F16D2200/0008F16D2200/0086
Inventor 王震宁张少司董小江林君山李斌
Owner 山东百德瑞轨道交通科技有限公司
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