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Uniform continuous iron phase reinforced copper high-speed train brake friction block and preparation method thereof

A technology of friction block and iron phase, applied in the direction of brake parts, additive manufacturing, additive processing, etc., can solve the problems of short process, long manufacturing process and low cost, and achieve high efficiency, performance and low cost Effect

Pending Publication Date: 2022-01-28
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing uniform and continuous iron-phase reinforced copper-high-speed iron brake friction block, which has a short process flow and low cost, and overcomes the shortcomings of long manufacturing process and high cost of the existing powder metallurgy friction block, specifically including the following step:

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) The shape and size of the high-speed operating brake blocks, to establish a uniform continuous digital model body with a circular reinforcing iron, Aeromonas circle diameter of 2mm, a wall thickness of 0.1mm.

[0019] (2) After a discrete slice of the model introduced digital melting Additive powder bed-system, the raw materials for the spherical powder of pure iron having a diameter of 20 to 60 micrometers, printing to obtain a uniform continuous circular iron reinforcement phase.

[0020] A uniform continuous circular iron (3) the shaped body obtained is disposed in the extruder with enhanced friction block casting mold.

[0021] (4) The obtained copper solution after melting poured into molds, the casting temperature is 1200 deg.] C, a pressure of 40MPa, dwell time of 10 minutes. Obtained after cooling a uniform continuous circular reinforcing iron phase high copper iron brake blocks. Pad hardness 99.3HBW, the coefficient of friction of 0.30. Example 2

Embodiment 2

[0022] (1) The shape and size of the high-speed operating brake blocks, to establish a uniform continuous digital model body with a circular reinforcing iron, Aeromonas circle diameter of 5mm, a wall thickness of 1.5mm.

[0023] (2) After a discrete slice of the model introduced digital melting Additive powder bed-system, the raw materials of iron having a diameter of 60 to 150 microns spherical powder, the printing phase to obtain a uniform continuous circular iron reinforcement.

[0024] A uniform continuous circular iron (3) the shaped body obtained is disposed in the extruder with enhanced friction block casting mold.

[0025] (4) The obtained copper solution after melting poured into molds, the casting temperature is 1200 deg.] C, a pressure of 20 MPa or, dwell time of 7 minutes. Obtained after cooling a uniform continuous circular reinforcing iron phase high copper iron brake blocks. Pad hardness 101.7HBW, the coefficient of friction of 0.28.

Embodiment 3

[0027] (1) The shape and size of the high-speed operating brake blocks, to establish a uniform continuous digital model body with a circular reinforcing iron, Aeromonas circle diameter of 8mm, a wall thickness of 2mm.

[0028] (2) After a discrete slice of the model introduced digital melting Additive powder bed-system, the raw materials of iron having a diameter of 100 to 200 microns spherical powder, the printing phase to obtain a uniform continuous circular iron reinforcement.

[0029] A uniform continuous circular iron (3) the shaped body obtained is disposed in the extruder with enhanced friction block casting mold.

[0030] (4) The obtained copper solution after melting poured into molds, the casting temperature is 1200 deg.] C, a pressure of 5 MPa, dwell time of 5 minutes. Obtained after cooling a uniform continuous circular reinforcing iron phase high copper iron brake blocks. Pad hardness 98.2HBW, the coefficient of friction of 0.29.

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Abstract

The invention discloses a uniform continuous iron phase reinforced copper high-speed train brake friction block and a preparation method thereof, and belongs to the field of new materials. The method comprises the steps that firstly, a three-dimensional digital model of a uniform continuous iron phase reinforcement is designed according to the appearance and size of the friction block, then the iron phase reinforcement is prepared through a powder bed melting additive manufacturing system, finally, the iron phase reinforcement is placed in a friction block mold, extrusion casting is combined with molten copper, and the uniform continuous iron phase reinforced copper high-iron brake friction block is obtained. The process is simple, and the continuous iron phase reinforcement of the friction block has the characteristics of continuous and uniform distribution, small stress concentration and difficulty in damage; the performance of the friction block can be effectively regulated and controlled by changing the components of the reinforcements, the shape and the wall thickness of the iron phase reinforcements and the components of the copper matrix, and the requirements of different working conditions are met.

Description

Technical field [0001] The present invention relates to a homogeneous continuous phase reinforced copper iron HSR brake friction block and its preparation method belongs to the field of new materials. Background technique [0002] High iron brake blocks are mounted on a high-speed braking device, guarantee the safe operation of high-speed rail expendable core key components. It requires a high coefficient of friction and stability at high temperature, high pressure and high speed conditions, the friction coefficient of the brake pad friction pad is sufficiently high and stable enough; not bonded with the friction surface, the friction surface does not occur peeling, abrasion, and other destructive weld junction destruction; to have good thermal conductivity and heat resistance, and can be 300 ~ 400 ℃ long time in the transient 900 ~ 1000 ℃, mechanical properties and friction properties remain unchanged; good thermal fatigue properties, a small coefficient of linear expansion, hig...

Claims

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Application Information

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IPC IPC(8): B22D19/02B22D18/02B22F10/28B33Y10/00B33Y70/00B33Y80/00F16D65/04
CPCB22D19/02B22D18/02B22F10/28B33Y10/00B33Y70/00B33Y80/00F16D65/04Y02P10/25
Inventor 黎振华李颢徐慧燕解靖伟
Owner KUNMING UNIV OF SCI & TECH
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