Preparation method of automobile brake disc

A technology of automobile brakes and prefabricated bodies is applied in the field of automobile brake disc manufacturing, which can solve the problems of low carbon deposition efficiency, long production cycle and high process cost, and achieve the effects of uniform densification, reduction of production cost and improvement of densification efficiency.

Pending Publication Date: 2022-07-22
龚汝涛
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, most cars use carbon / ceramic composite brake discs, which have the advantages of light weight, high specific strength, large specific heat capacity, high thermal conductivity, matching dynamic and static friction coefficients, stable braking performance, and good impact resistance. The preparation method has disadvantages such as long production cycle, high process cost and low carbon deposition efficiency;

Method used

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  • Preparation method of automobile brake disc

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] like figure 1 As shown, the invention provides a preparation method of an automobile brake disc, which consists of the following steps:

[0030] Step 1, using chopped carbon fiber and modified aminophenol resin as base material, and mixing, the formed mixture is used as prepreg;

[0031] Step 2: Disperse the mixed prepreg evenly on the tray, and dry it for later use;

[0032] Step 3, preparing an automobile brake pair prefab;

[0033] Step 4: carbonizing the obtained automobile brake pair preform, and infiltrating and curing;

[0034] Step 5, carrying out high temperature treatment on the obtained semi-finished product of the automobile brake disc after impregnation and curing treatment;

[0035] Step 6. The semi-finished product of the automobile brake disc that has been processed for many times is weighed to measure the density;

[0036] Step 7. Finish the semi-finished product of the brake disc according to the drawing requirements.

[0037] The mass ratio of ch...

Embodiment 2

[0040] like figure 1 As shown, on the basis of Embodiment 1, the present invention provides a technical solution: preferably, step 3 further includes placing the pre-pressing head in the mold cavity, and starting the hydraulic press, and laying the pre-pressing head on the mold mold The prepreg in the cavity is pre-pressed, the applied pressure is 7.0Mpa, the pressing time is 1-2min, and the pressing temperature is 120 degrees Celsius to obtain a preform with ventilation grooves and mounting holes on the surface, complete the pre-press, press and cure During molding, metal embedded parts are placed in the ventilation groove of the preform blank. Step 3 also includes continuing to fill the mold cavity with a second prepreg, then clamping the mold, and then using a hydraulic press to pressurize and pressurize a second time. Pressing and curing is carried out by means of step heating, and then it is demolded to obtain a preform of an automobile brake disc.

[0041]In addition, t...

Embodiment 3

[0043] like figure 1 As shown, on the basis of Embodiment 1, the present invention provides a technical solution: preferably, step 4 also includes placing the obtained automobile brake disc preform into a muffle furnace, and evacuating it to less than 1KPa Start to heat up, when the temperature rises to 150 degrees Celsius, keep warm for 2 hours. After the heat preservation is completed, the temperature in the furnace is raised to 900 degrees Celsius, and then the temperature is kept for 2 hours. With the cooling of the furnace body, take out the car brake disc preform, and then put it in the furnace. Put it into the dipping furnace with polycarbosilane solution, the dipping time is 1-2 hours, take it out after the end, and carry out drying treatment to obtain the semi-finished product of automobile brake disc. Step 5 also includes, the temperature during heat treatment is 1000 degrees Celsius - 1200 degrees Celsius, and keep the temperature for 1-3 hours. Step 6 also includes...

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Abstract

The invention discloses a preparation method of an automobile brake disc, and relates to the technical field of automobile brake disc manufacturing, and the preparation method comprises the step of carrying out high-temperature treatment on an obtained automobile brake disc semi-finished product subjected to infiltration curing treatment. According to the preparation method, the carbon fiber prepreg and the modified ammonia phenolic resin are adopted as prepregs, mold pressing is carried out to prepare an automobile brake pair prefabricated body, a polysilazane solution and a polycarbosilane solution are adopted as ceramic precursors, an alternate infiltration pyrolysis method is adopted for densification, and the carbon fiber reinforced carbon-based/ceramic-based automobile brake pair with the density larger than or equal to 1.80 g/cm < 3 > is obtained, so that the carbon fiber reinforced carbon-based/ceramic-based automobile brake pair with the density larger than or equal to 1.80 g/cm < 3 > is obtained. Compared with a traditional three-dimensional needling carbon fiber prefabricated body densification process adopting a chemical vapor infiltration (CVI) method and a molten silicon infiltration (RMI) method, the automobile brake pair prefabricated body is prepared by adopting an integrated molding process, so that the density of the prefabricated body is greater than 1.4 g/cm < 3 >, and then the carbon fiber automobile brake pair prefabricated body is impregnated by utilizing a liquid ceramic precursor, so that the density of the automobile brake pair is greater than 1.4 g/cm < 3 >. And the liquid precursor is subjected to high-temperature cracking after being crosslinked and cured to be converted into a ceramic matrix, so that the production cost is reduced, and the densification efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of automobile brake disc manufacturing, in particular to a preparation method of an automobile brake disc. Background technique [0002] There are two types of braking in the car, namely disc brakes and drum brakes. Since disc brakes have better heat dissipation than drum brakes, they are not prone to thermal recession under high-speed braking. Therefore, many middle and high-end cars now use full disc brakes. The main components of disc brakes are brake disc, wheel cylinder, brake caliper, oil pipe, etc. The brake disc is fixed on the wheel and rotates with the wheel; the wheel cylinder is fixed on the bottom plate of the brake; the two friction pads on the brake caliper are respectively installed on both sides of the brake disc. When braking, the piston of the sub-pump is acted by the hydraulic pressure delivered by the oil pipe, which pushes the friction pad to press the brake disc to generate friction...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/83C04B35/84C04B35/622C04B35/565
CPCC04B35/83C04B35/622C04B35/571C04B35/573C04B2235/48C04B2235/483C04B2235/77C04B2235/608
Inventor 龚汝涛
Owner 龚汝涛
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