A preparation method of powder metallurgy brake shoe for electric locomotive

A powder metallurgy and brake shoe technology is applied in the preparation of powder metallurgy brake shoes for medium and low-speed electric locomotives, and in the field of electric locomotive brake pads. Excellent processing performance, good lubricating performance and good wear resistance

Active Publication Date: 2019-08-02
SUZHOU DONEKA NEW MATERIALS CORP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the temperature of the wheel tread increases to a certain level, the tread will be worn, cracked or peeled off, affecting the service life and driving safety
Therefore, traditional tread brake shoes cannot meet the needs of train braking

Method used

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  • A preparation method of powder metallurgy brake shoe for electric locomotive
  • A preparation method of powder metallurgy brake shoe for electric locomotive
  • A preparation method of powder metallurgy brake shoe for electric locomotive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0096] 1. Prepare the raw materials according to the following proportions by weight:

[0097]

[0098]

[0099] 2. Under normal temperature, iron powder, copper powder, additives and zinc stearate are uniformly mixed to obtain the first premix; then natural graphite and kerosene are uniformly mixed to obtain the second premix; The first premix and the second premix were added to the mixing equipment and mixed for 7 hours to prepare the premix.

[0100] 3. Put the premixed material in a mold for pressing treatment. The pressing equipment is a 315-ton hydraulic press with a pressing specific gravity of 5.3 to obtain a tile-shaped powder metallurgy brake shoe friction block blank.

[0101] 4. Roast the tile-shaped powder metallurgy brake shoe friction block blank, firstly increase the temperature of the sintering furnace to 1050°C within 5.5 hours, then keep it at this temperature for 4.5 hours, and then cool it to room temperature with cold water to obtain A tile-shaped ...

Embodiment 2

[0108] 1. Prepare the raw materials according to the following proportions by weight:

[0109]

[0110] 2. Under normal temperature, iron powder, copper powder, additives and zinc stearate are uniformly mixed to obtain the first premix; then natural graphite and kerosene are uniformly mixed to obtain the second premix; The first premix and the second premix were added to the mixing equipment and mixed for 6 hours to prepare the premix.

[0111] 3. Put the premixed material in a mold for pressing treatment. The pressing equipment is a 315-ton hydraulic press with a pressing specific gravity of 5.6 to prepare a powder metallurgy brake shoe friction block blank.

[0112] 4. Roast the powder metallurgy brake shoe friction block blank, firstly increase the temperature of the sintering furnace to 1000°C within 5 hours, then keep it at this temperature for 6 hours, and then cool it to room temperature with cold water to obtain a tile-shaped powder metallurgy Brake shoe friction b...

Embodiment 3

[0119] 1. Prepare the raw materials according to the following proportions by weight:

[0120]

[0121] 2. Under normal temperature, iron powder, copper powder, additives and zinc stearate are uniformly mixed to obtain the first premix; then natural graphite and kerosene are uniformly mixed to obtain the second premix; The first premix and the second premix were added to the mixing equipment and mixed for 10 hours to prepare the premix.

[0122] 3. Put the premixed material in a mold for pressing treatment. The pressing equipment is a 315-ton hydraulic press with a pressing specific gravity of 5.0 to prepare a powder metallurgy brake shoe friction block blank.

[0123] 4. Roast the powder metallurgy brake shoe friction block blank, firstly increase the temperature of the sintering furnace to 1100°C within 6 hours, then keep it at this temperature for 3 hours, and then cool it to room temperature with cold water to obtain a tile-shaped powder metallurgy Brake shoe friction ...

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Abstract

The invention provides a manufacturing method for a powder metallurgy brake shoe for an electric locomotive. The method comprises the steps that iron powder, copper powder, natural graphite, an additive and a lubricating agent are evenly mixed to obtain a premix; the premix is placed in a die to be pressed to obtain a tile-shaped powder metallurgy brake shoe friction block blank; the blank is sintered to obtain a powder metallurgy brake shoe friction block; the powder metallurgy brake shoe friction block and a steel backing are subjected to pressure sintering to obtain a brake shoe friction block assembly; a steel shoe, a retaining ring and a stop dog are subjected to combination welding treatment to obtain a brake shoe framework assembly, and the brake shoe framework assembly and the brake shoe friction block assembly are subjected to combination welding treatment to obtain a brake shoe blank; and the brake shoe blank is subjected to varnish dipping and painting treatment, and the powder metallurgy brake shoe is obtained, wherein the additive comprises molybdenum disulfide, silicon carbide and nickel powder, and the lubricating agent comprises zinc stearate and kerosene. The manufactured brake shoe for the locomotive is stable in frictional coefficient, small in attenuation and abrasion and good in heat conduction and has good physical, chemical and mechanical performance.

Description

technical field [0001] The invention belongs to the field of railway locomotive accessories, and relates to brake pads for electric locomotives, in particular to a method for preparing powder metallurgy brake shoes for medium and low-speed electric locomotives. Background technique [0002] With the rapid development of the national economy and the continuous improvement of people's living consumption level, the requirements for the convenience and comfort of transportation are also constantly increasing. Train notification has become an inevitable trend in the development of train transportation, and the relative safety problems have been paid more and more attention by people. The braking performance of the train is an important factor to determine the safe transportation of the train. During the operation of the train, the parts that directly rub against the wheels to stop the train are the brake shoes. The brake shoe is the most critical safety part of the train. The qua...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/16B22F1/00B22F7/08
Inventor 林勇朱约辉
Owner SUZHOU DONEKA NEW MATERIALS CORP LTD
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