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Production method of semimetal ceramic matrix air disc brake pad

A disc brake pad, base air pressure technology, applied in the direction of brake discs, friction linings, mechanical equipment, etc., can solve the problems of high temperature wear performance that is prone to cracks, shortened service life of brake pads, and aggravated high temperature wear of materials, etc. Large braking torque, less dust fall, no obvious decline effect

Inactive Publication Date: 2013-08-07
HUNAN BOYUN AUTOMOBILE BRAKE MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

3. Since the wearable thickness of the friction lining of the air disc brake is 20mm, while the wearable thickness of the friction lining of the drum brake is less than 10mm, under the same conditions of use, the replacement cycle of the friction lining of the disc brake is shorter than that of the drum brake. The brakes are much longer: if the difference in the cooling capacity of the two brakes is taken into account, the difference in their replacement cycle can reach more than 3 times
In terms of the formula characteristics of the brake pads, the temperature on the surface of the brake pads and brake discs is as high as 500-700°C when the car is braked. Since the resin-based brake pads will decompose and release water, gas, oil, etc. at high temperatures, they will form on the friction surface. A layer of thin film makes dry friction into mixed friction or wet friction, the friction coefficient is significantly reduced, and there is a hidden danger of brake failure. Significantly reduced service life
At present, some ceramic automobile brake pads on the market use a large amount of ceramic fiber instead of traditional steel fiber. Although its braking comfort performance (including noise, dust fall and matching with the pair, etc.) has been significantly improved, resin is still used as the main material. Adhesives, which lead to problems such as high-temperature thermal recession, easy cracks and poor high-temperature wear performance at high temperatures

Method used

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  • Production method of semimetal ceramic matrix air disc brake pad
  • Production method of semimetal ceramic matrix air disc brake pad
  • Production method of semimetal ceramic matrix air disc brake pad

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016]

[0017] The specific preparation method is as follows:

[0018] (1) Mixing: The order of putting the weighed materials into the high-speed mixer is as follows: first pre-mix the non-metallic composite fiber and friction performance regulator to ensure that the composite fiber is in a uniformly dispersed state, and then add other Raw and auxiliary materials are evenly stirred;

[0019] (2), hot pressing: pressing pressure 250kgf / cm 2 , the hot-pressing temperature is 155°C, the exhaust is 6 times, and the holding time is 60s / mm;

[0020] (3), heat up the formed brake pad from room temperature to 210°C in 6 hours, keep it warm for 6 hours, and then cool to room temperature with the furnace;

[0021] (4) The heat-treated brake pads are ground and drilled according to the technical requirements, and then heated at 350 ℃ temperature for ceramic treatment, spraying, printing, inspection, packaging.

[0022] Performance of semi-metallic ceramic based pneumatic disc b...

Embodiment 2

[0032]

[0033] The specific preparation method is as follows:

[0034] (1) Mixing: The order of putting the weighed materials into the high-speed mixer is as follows: first pre-mix the non-metallic composite fiber and friction performance regulator to ensure that the composite fiber is in a uniformly dispersed state, and then add other Raw and auxiliary materials are evenly stirred;

[0035] (2), hot pressing: pressing pressure 200kgf / cm 2 , the hot-pressing temperature is 150°C, exhaust 5 times, and the holding time is 55s / mm;

[0036] (3), heat up the formed brake pad from room temperature to 200°C in 5.5 hours, keep it warm for 4 hours, and then cool to room temperature with the furnace;

[0037] (4) The heat-treated brake pads are ground and drilled according to the technical requirements, and then ceramicized at a temperature of 300°C, sprayed, marked, inspected, and packaged.

[0038] Performance of semi-metallic ceramic based pneumatic disc brake pads

[0039] A...

Embodiment 3

[0048]

[0049] The specific preparation method is as follows:

[0050] (1) Mixing: The order of putting the weighed materials into the high-speed mixer is as follows: first pre-mix the non-metallic composite fiber and friction performance regulator to ensure that the composite fiber is in a uniformly dispersed state, and then add other Raw and auxiliary materials are evenly stirred;

[0051] (2), hot pressing: pressing pressure 200kgf / cm 2 , the hot-pressing temperature is 150°C, exhaust 5 times, and the holding time is 55s / mm;

[0052] (3), heat up the formed brake pad from room temperature to 200°C in 5.5 hours, keep it warm for 4 hours, and then cool to room temperature with the furnace;

[0053] (4) The heat-treated brake pads are ground and drilled according to the technical requirements, and then ceramicized at a temperature of 300°C, sprayed, marked, inspected, and packaged.

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Abstract

The invention discloses a semimetal ceramic matrix air disc brake pad of an air disc braking system for heavy-duty freight cars and a production method thereof, wherein the production flow is as follows: sequentially weighing and putting 10 nonmetal assorted fibre, 35-40 metal fibre, 20 or 25 of friction performance regulator, 15-25 of vitrified bond, 5-10 of elastic toughening agent and 10 of filler into a high-speed mixer to mix uniformly, then carrying out pressing and thermocuring treatment according to a dry once-through molding technique of the traditional resin matrix friction materials, finally machining, ceramic processing, inspecting and packaging. The semimetal ceramic matrix air disc brake pad manufactured according to the technique has large braking torque, comfortable emergency braking, small heat fading and simple production technology, is environmental friendly, is particularly suitable for air disc brakes of the heavy-duty freight cars, and has wide market prospect.

Description

technical field [0001] The invention relates to a method for preparing a semi-metal ceramic based air pressure disc brake pad. Background technique [0002] From a technical point of view, 1. Due to its structural characteristics, the heat generated by drum brakes is difficult to dissipate during work. Because most of the brake discs of pressure disc brakes are exposed to the air, heat exchange is easy, and the temperature rises during work. Lower, less thermal recession. 2. Under the condition of the same required braking torque, the pneumatic disc brake has much smaller dimensions than the drum brake. Therefore, it brings convenience to the layout of the whole vehicle; and because its mass, especially the mass of the rotating part, is much smaller, the imbalance is also much smaller. It can significantly improve the comfort, smoothness and handling stability of the car. 3. Since the wearable thickness of the friction lining of the air disc brake is 20mm, while the weara...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16D69/02F16D65/12
Inventor 刘伯威贺云果刘咏李度成
Owner HUNAN BOYUN AUTOMOBILE BRAKE MATERIALS
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