Motor train unit grinder which does not generate metal inserts and has good shaping effect

A grinding wheel and EMU technology, which is applied in the field of transportation, can solve the problems of poor metal inlay and shape modification, and achieve the effects of preventing metal inlay, increasing cleaning effect, and high friction coefficient

Active Publication Date: 2020-11-03
METALS & CHEM RES INST CHINA ACAD OF RAILWAY SCI +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In order to overcome the defects of the prior art, the present invention adjusts the mechanical properties and friction properties of the EMU grinding wheel by improving the formula, in order to solve the problem of poor metal inlay and modification effect during its use

Method used

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  • Motor train unit grinder which does not generate metal inserts and has good shaping effect
  • Motor train unit grinder which does not generate metal inserts and has good shaping effect
  • Motor train unit grinder which does not generate metal inserts and has good shaping effect

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] (1) Weigh 28 kilograms of modified phenolic resins respectively; 48 kilograms of reduced iron powder; 22 kilograms of copper fibers; 8 kilograms of steel fibers; 6 kilograms of potassium feldspars; 9 kilograms of graphite; 8 kilograms of cryolite; 2 kg of barium sulfate; 4 kg of boron nitride; then, the above-mentioned weighed raw materials were put into a high-speed mixer, mixed for 1 minute at a speed of 50 rpm, and then mixed for 5 minutes at a speed of 500 rpm to obtain a premix.

[0063] (2) Put the premix in an oven and dry at 80°C for 5 minutes to obtain a dried semi-finished product;

[0064] (3) Take 1.56 kg of the semi-finished product dried above and put it into a molding equipment preheated at 160-165°C, add a grinding steel back, pressurize 40 tons on a four-column hydraulic press, hold the pressure for 40 minutes, unload the mold, and obtain Semi-finished grinders;

[0065] (4) Then, put the obtained semi-finished grinding wheel into an oven, and process ...

Embodiment 2

[0069] Milling sub-sample A and sample B were prepared as shown in Table 1 below, wherein sample C used the milling sub-sample prepared in Example 1.

[0070] Table 1:

[0071]

[0072]

[0073] Sample A and Sample B were prepared according to the method described in Example 1.

[0074] The physical properties of samples A, B and C were tested according to the standard method, and the friction performance of the grinding wheel was tested on a 1:3 scaled down brake dynamic test bench. The performance test results of samples A, B and C in the laboratory were compared with field use See Table 2 and Table 3 below for comparison.

[0075] Table 2: Physical and mechanical properties of three grinding sub-samples A, B, and C

[0076]

[0077] Table 3: Friction properties of three abrasive sub-samples A, B, and C

[0078]

[0079]

[0080] It can be seen from Table 2 that sample A is well used in the field; compared with sample A, the physical properties of sample B ...

Embodiment 3

[0083] Using the method of Example 1, according to the formulation of Table 4 below, the abrasives were prepared, and the properties of the prepared abrasives were shown in Table 5.

[0084] Table 4:

[0085]

[0086] Table 5: Physical properties of samples D and E

[0087]

[0088]

[0089] Table 6: Friction properties of samples D and E

[0090]

[0091] It can be seen from Tables 4 to 6 that after changing the formula ratio, the physical properties and friction properties of samples D and E all meet the site requirements, and no metal inlays are produced. However, the binder content of sample D is lower than that of sample C with the optimal ratio, and the wear amount of the friction test increases, and the service life decreases; the ratio of binder and cryolite in sample E is higher than that of C, which makes the internal adhesion of the friction body As the force increases, the amount of wear in the friction test becomes smaller, and the life span is impro...

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Abstract

The invention provides a motor train unit grinding element which does not generate metal inserts and is good in shaping effect. The motor train unit grinder comprises the following components in percentage by weight: 10-30% of modified phenolic resin, 30-40% of reduced iron powder, 10-20% of copper fiber, 3-8% of steel fiber, 3-8% of potassium feldspar, 4-9% of graphite, 3-8% of cryolite, 2-4% ofaluminum oxide, 1-3% of precipitated barium sulfate and 2-5% of boron nitride, wherein the motor train unit grinder does not comprise sepiolite. The invention further provides a preparation method ofthe motor train unit grinding body and application of the motor train unit grinding body in railway transportation.

Description

technical field [0001] The invention relates to the field of transportation, in particular to an EMU grinding wheel which does not produce metal inlays and has a good shape modification effect. Background technique [0002] The motor car tread cleaner plays the role of cleaning the wheels and increasing the wheel-rail adhesion coefficient to ensure the braking safety of high-speed trains. The parts that the tread cleaner directly acts on the wheels are called grinding wheels. Abrasives, usually made of high metal content composite materials, contact the wheel at low speed intermittently or continuously with low pressure to clean and build adhesion. [0003] However, there are still many problems with the EMU grinders used on site, one of which is that metal mosaic phenomenon is prone to occur during use. The mechanism of the metal mosaic phenomenon has no unified conclusion in the world. The most accepted theory is that the grinding wheel cleans the wheel tread when it is w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L61/14C08K13/04C08K7/06C08K3/08C08K3/04C08K3/22C08K3/30C08K3/38B60S1/68
CPCC08K13/04C08K7/06C08K3/08C08K3/04C08K3/22C08K3/30C08K3/38B60S1/68C08K2003/0856C08K2003/085C08K2003/2227C08K2003/3045C08K2003/385C08K2201/005C08L61/14
Inventor 吉媛裴顶峰贺春江刘鑫韩欢热谢晓王玮
Owner METALS & CHEM RES INST CHINA ACAD OF RAILWAY SCI
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