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A preparation method of functionally graded aluminum matrix composite brake disc

An aluminum-based composite material and functional gradient technology, applied in the direction of brake discs, mechanical equipment, brake types, etc., can solve problems such as high thermal stress, reduced friction, and fracture, and achieve the goal of enhancing toughness, reducing fracture, and reducing costs Effect

Active Publication Date: 2019-04-12
CHANGDE FEIWO NEW ENERGY PARTS MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The current brake disc materials are mainly cast iron and cast steel, which have the disadvantages of heavy weight, poor wear resistance, slow heat dissipation, etc.
Especially when braking for a long time at high speed, the brake will fail due to high temperature and reduced friction; and the thermal stress will be too high due to slow heat dissipation, which will cause the brake pads to distort, deform or even break
At present, some scientific research units have developed a homogeneous aluminum-based composite material, which mixes some wear-resistant and high-strength materials into the molten aluminum alloy. Due to long-term stirring, the brittle phase generated by the stirring inside the brake disc is increased, and air bubbles are often generated. , oxide slag and other internal defects; in addition, the volume percentage of wear-resistant and high-strength particles in the homogeneous aluminum matrix composite material can only reach 30%, and the amount of addition is limited

Method used

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  • A preparation method of functionally graded aluminum matrix composite brake disc
  • A preparation method of functionally graded aluminum matrix composite brake disc
  • A preparation method of functionally graded aluminum matrix composite brake disc

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment one: the brake disk of common truck.

[0031] exist figure 1 , figure 2 with image 3 Among them, this functionally graded aluminum-based composite brake disc is characterized in that the material is an aluminum alloy with a gradient reinforcement skeleton, the disc edge 1 is a friction layer containing high-density reinforcing material 7, and the center of the disc is a shaft hole 2. The shaft hole 2 is surrounded by connecting discs 3, which contain medium and bottom density reinforcing materials 8. Connecting discs 3 are evenly distributed with connecting screw holes 6, and the periphery of connecting discs 3 is aluminum alloy cooling ring 4, which can dissipate heat from aluminum alloys. The back side of the ring 4 has radial aluminum alloy cooling ribs 5 evenly distributed thereon.

[0032] exist Figure 5 Among them, a large number of particles 9 and fibers 10 are wrapped by the aluminum alloy matrix 11, forming a very wear-resistant structure.

...

Embodiment 2

[0048] Embodiment 2: heavy-duty vehicle brake disc.

[0049] The structure of this functionally graded aluminum matrix composite brake disc is similar to that of the first embodiment.

[0050] The manufacturing method of the functionally graded aluminum-based composite brake disc is prepared by high-temperature extrusion molding of the cast aluminum alloy and the reinforcing body skeleton, followed by mechanical processing and heat treatment; it is characterized in that it includes the following preparation steps:

[0051] (1) Preparation of reinforced skeleton slurry: Add reinforced fibers, granules, and water-soluble binders to water in sequence according to a certain proportion, mix to form an aqueous solution, stir evenly and settle at the bottom of the aqueous solution to obtain thick slurry, thick slurry The solid content is 70%;

[0052] (2) Place a permeable membrane inside the disc-shaped mold to facilitate water penetration. Pour the thick slurry into the disc-shape...

Embodiment 3

[0066] Embodiment three: rail train brake disc.

[0067] The structure of this functionally graded aluminum matrix composite brake disc is similar to that of the first embodiment.

[0068] The manufacturing method of the functionally graded aluminum-based composite brake disc is prepared by high-temperature extrusion molding of the cast aluminum alloy and the reinforcing body skeleton, followed by mechanical processing and heat treatment; it is characterized in that it includes the following preparation steps:

[0069] (1) Preparation of reinforced skeleton slurry: Add reinforced fibers, granules, and water-soluble binders to water in sequence according to a certain proportion, mix to form an aqueous solution, stir evenly and settle at the bottom of the aqueous solution to obtain thick slurry, thick slurry The solid content is 80%;

[0070] (2) Place a permeable membrane inside the disc-shaped mold to facilitate water penetration. Pour the thick slurry into the disc-shaped mo...

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Abstract

The invention discloses a functional gradient aluminum matrix composite brake disc and a preparing method thereof. The material of the brake disc is an aluminum alloy internally containing a gradient enhancement body framework, the disc edge is a friction layer, a shaft hole is formed in the center of the disc, a connecting round piece is arranged around the shaft hole, an aluminum alloy cooling ring is arranged on the periphery of the connecting round piece, and evenly-distributed radial aluminum alloy cooling ribs are arranged on the back face of the aluminum alloy cooling ring. The preparing method comprises the steps of firstly, preparing of enhanced framework slurry; secondly, manufacturing of an enhanced framework; thirdly, drying of an enhanced framework blank; fourthly, high-temperature squeezed casting forming of the preheated framework and the aluminum alloy; fifthly, mold assembly and extrusion casting forming; sixthly, machining and heat treatment of a rough brake disc product, and obtaining the brake disc finished product. The brake disc has the beneficial effects that compared with a traditional evenly-mixed aluminum matrix composite, internal defects of the brittle phase, oxide, inclusion, bubbles and the like generated by stirring in the brake disc can be overcome, and the proportion of the framework and the aluminum alloy can be improved. The brake disc is mainly applied to general wagons, heavy-duty cars and rail trains.

Description

technical field [0001] The invention relates to a brake disc of an aluminum alloy composite material, in particular to a brake disc of a functionally graded aluminum-based composite material and a preparation method thereof. Background technique [0002] The current brake disc materials are mainly cast iron and cast steel, which have the disadvantages of heavy weight, poor wear resistance, and slow heat dissipation. Especially in high-speed braking for a long time, the brake will fail due to excessive temperature and reduced friction; and due to slow heat dissipation, the thermal stress will be too high, causing the brake pads to distort, deform or even break. At present, some scientific research units have developed a homogeneous aluminum-based composite material, which mixes some wear-resistant and high-strength materials into the molten aluminum alloy. Due to long-term stirring, the brittle phase generated by the stirring inside the brake disc is increased, and air bubble...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16D65/12F16D65/847B22D18/02B22D19/02C04B35/80C04B35/76C04B35/565
CPCB22D18/02B22D19/0081B22D19/02C04B35/565C04B35/76C04B35/806C04B2235/5216C04B2235/5224C04B2235/5232C04B2235/5236C04B2235/5248F16D65/125F16D65/128F16D65/847
Inventor 王寒冰童辉陈玲
Owner CHANGDE FEIWO NEW ENERGY PARTS MFG
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