CN114151481A - Large flat plate special-shaped friction plate for engineering machinery, preparation method and mold - Google Patents
Large flat plate special-shaped friction plate for engineering machinery, preparation method and mold Download PDFInfo
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- CN114151481A CN114151481A CN202111458918.7A CN202111458918A CN114151481A CN 114151481 A CN114151481 A CN 114151481A CN 202111458918 A CN202111458918 A CN 202111458918A CN 114151481 A CN114151481 A CN 114151481A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D69/00—Friction linings; Attachment thereof; Selection of coacting friction substances or surfaces
- F16D69/02—Compositions of linings; Methods of manufacturing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D69/00—Friction linings; Attachment thereof; Selection of coacting friction substances or surfaces
- F16D69/04—Attachment of linings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2200/00—Materials; Production methods therefor
- F16D2200/0082—Production methods therefor
- F16D2200/0086—Moulding materials together by application of heat and pressure
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Abstract
The invention provides a large flat plate special-shaped friction plate for engineering machinery, a preparation method and a die, and belongs to the technical field of friction material manufacturing. The material formula of the special-shaped friction plate comprises the following components in percentage by weight: 8-13% of modified resin, 15-25% of reinforcing material fiber, 4-10% of toughening agent, 10-20% of wear-resistant lubricant, 10-15% of drilling material, 5-8% of metal sulfide, 3-8% of grinding agent and 10-25% of space filler; the dysmorphism mould includes: the device comprises a base, a top seat, a hydraulic machine, a top sliding seat, a top die assembly, a bottom die assembly and a middle die assembly; the friction plate designed and prepared by the invention has high static friction, can increase the movement friction resistance of engineering machinery and prevent the machinery from sliding, and the developed friction plate formula can also be used for the production and the manufacture of a parking brake, meets the production requirements, can realize large-scale production, is beneficial to improving the customer satisfaction degree, and has good applicability and popularization.
Description
Technical Field
The invention relates to the technical field of brake pad manufacturing, in particular to a large flat plate special-shaped friction plate for engineering machinery, a manufacturing method and a die.
Background
The brake pad is generally composed of a steel plate, a bonding heat insulation layer and a friction block, and the friction block is extruded on a brake disc or a brake drum to generate friction during braking, so that the purpose of braking the vehicle in a speed reducing manner is achieved. The friction block is mainly composed of a friction material and an adhesive, wherein the friction material is an important component in the manufacturing and using processes of the brake pad. The asbestos friction material is made up by using asbestos fibre, adding proper quantity of filler, using resin as adhesive and adopting hot-pressing process, and its carcinogenesis can not meet the requirements of modern automobile industry. In the 70 s of the 20 th century, a semimetal friction material taking steel fibers as a main asbestos substitute material was adopted at first abroad, and in the early 80-90 s, the semimetal friction material already occupies the whole automobile disc brake pad field, but the semimetal friction material has the defects of high density, easiness in rusting, high brake noise, damage dual and the like, so that the further development of the semimetal friction material is limited. The friction material without asbestos organic matter is first developed by Akebono company in Japan, adopts ceramic, mineral fiber or high temperature resistant organic fiber to replace steel fiber, overcomes the defects of the traditional semimetal friction material, and is a novel high-performance automobile braking friction material. The friction material without the asbestos organic matter mainly comprises a ceramic fiber friction material, a carbon fiber reinforced friction material and an aramid fiber reinforced friction material, wherein the friction and wear performance research of the ceramic fiber friction material is mostly limited to specific experimental conditions, the carbon fiber reinforced friction material influences the wide application of the carbon fiber reinforced friction material due to high production cost of the carbon fiber, and the aramid fiber reinforced friction material has the wear resistance similar to that of a semi-metal friction material and is considered as a main direction for the development of the friction material in future.
Friction material is a component material that is used in power machines to perform braking and transmission functions by friction. It mainly comprises a brake lining (brake pad) and a clutch lining (clutch plate). The brake plate is used for braking, and the clutch plate is used for transmission. According to the shape of the product, the brake can be divided into a brake block (a disc type block and a drum type block), a brake band, a brake shoe, a clutch plate and a heterosexual friction plate. The disc type sheet is planar, and the drum type sheet is arc-shaped. The brake shoe (train brake shoe, oil rig) is the arc product, but is much thicker than ordinary arc brake shoe, 25 ~ 30mm scope. Brake belts are commonly used in agricultural machinery and engineering machinery and belong to soft friction materials. The clutch plates are generally annular ring shaped articles. The heterosexual friction plate is widely used for various engineering machinery, such as a friction press, a wind power friction plate and the like.
Disclosure of Invention
Aiming at the defects in the prior art, the invention prepares a large flat plate special-shaped friction plate sample for 500 x 500mm engineering machinery by a mould pressing method, and researches and provides a large flat plate friction plate for 500 x 500mm engineering machinery, a preparation method and a special-shaped mould.
The invention solves the technical problems by the following scheme:
a large flat plate special-shaped friction plate for engineering machinery comprises the following materials in percentage by weight: 8-13% of modified resin, 15-25% of reinforcing material fiber, 4-10% of toughening agent, 10-20% of wear-resistant lubricant, 10-15% of drilling material, 5-8% of metal sulfide, 3-8% of grinding agent and 10-25% of space filler.
Preferably, the material formula of the modified resin comprises the following components in percentage by weight: 40-60% of cashew nut shell oil modified resin and 40-60% of butyronitrile modified resin.
Preferably, the material formula of the reinforcing material fiber comprises the following components in percentage by weight: 50-60% of composite mineral fiber, 30-40% of BMC-3.0 type alkali-free glass fiber and 5-10% of cellulose fiber.
Preferably, the material formula of the toughening agent comprises the following components in percentage by weight: 40-60% of butyronitrile rubber powder and 40-50% of butylbenzene rubber powder.
Preferably, the material formula of the antiwear lubricant comprises the following components in percentage by weight: 40-60% of natural crystalline flake graphite, 20-40% of needle coke and 10-20% of coke powder.
Preferably, the reclaimed materials are obtained after the friction plates are drilled.
Preferably, the material formula of the metal sulfide comprises the following components in percentage by weight: 40-50% of pyrite, 20-30% of copper sulfide and 20-30% of molybdenum disulfide.
Preferably, the material formula of the grinding enhancer comprises the following components in percentage by weight: 60-70% of zircon powder and 30-40% of high-alumina fine powder.
Preferably, the material formula of the space filler comprises the following components in percentage by weight: 40-60% of precipitated barium sulfate, 30-40% of light calcium carbonate and 20-30% of sericite.
A preparation method of the large flat plate special-shaped friction plate for the engineering machinery comprises the following preparation steps:
(1) preparing materials: accurately weighing the raw materials of the components of the material formula of the special-shaped friction plate according to the weight percentage for standby:
(2) mixing materials: putting the weighed raw materials of each component into a plow harrow type high-speed mixer, wherein the mixing time is 8-10 min;
(3) molding: weighing the mixture according to the thickness requirement of the special-shaped friction plate and the density calculation of the mixture, pouring the mixture into a hot-pressing mold, and setting the hot-pressing pressure to be 200-300 kg.f/cm2The hot pressing temperature is 145-155 ℃, gas is exhausted once every 20-30 s of pressing, 5-6 times of gas is exhausted in total, and the pressure maintaining time is 600-900 s;
(4) and (3) heat treatment: heating the hot-press formed brake pad from room temperature to 145-155 ℃ within 4-5 h, preserving heat for 6-8 h, and then stopping heating until the temperature of the oven is cooled to below 50 ℃;
(5) post-processing: and then placing the friction plate with the thickness of 500mm multiplied by 500mm manufactured by the process on a plane abrasive belt grinding machine according to the technical requirements to be ground to the standard thickness, then marking, inspecting and packaging after processing to obtain the friction plate.
A large flat plate special-shaped die for engineering machinery for preparing the friction plate comprises a base, a top seat, a hydraulic machine, a top sliding seat, a top die assembly, a bottom die assembly and a middle die assembly; the periphery of the upper end face of the base is fixedly connected with the top seat through a fixing column, the top seat is provided with a hydraulic machine, and the telescopic end of the hydraulic machine is fixedly connected with the upper end face of the top sliding seat; the periphery of the top sliding seat is sleeved on the fixed column in a vertically sliding mode, the lower end face of the top sliding seat is fixedly provided with a top mounting platform, and the upper end face of the base is fixedly provided with a bottom mounting platform; the top die assembly comprises a top die base fixedly arranged on the lower end face of the top mounting platform; the bottom die assembly comprises a bottom die base fixedly arranged on the upper end surface of the bottom mounting platform; the middle die assembly is distributed between the top die assembly and the bottom die assembly and comprises a middle die base; the die cavity is arranged on the upper end surfaces of the middle die holder and the bottom die holder, the die heads for inserting into the die cavities are respectively distributed on the lower end surfaces of the top die holder and the middle die holder, and the cylinders are respectively arranged on two sides of the middle die holder and the bottom die holder and are used for jacking the middle die holder to facilitate film ejection.
The beneficial technical effects which can be realized by the invention at least comprise: the large flat plate special-shaped friction plate designed and prepared by the invention has high static friction force, can increase the movement friction resistance of engineering machinery and prevent the machinery from sliding, and the developed friction plate formula can also be used for the production and the manufacture of a parking brake, meets the production requirements, can realize large-scale production, is beneficial to improving the customer satisfaction degree, and has good applicability and popularization.
Drawings
FIG. 1 is a schematic structural diagram 1 of a large flat plate special-shaped mold for engineering machinery according to the present invention;
fig. 2 is a schematic structural diagram 2 of a large flat plate special-shaped die for engineering machinery of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to specific parameters in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
A large flat plate special-shaped friction plate for engineering machinery comprises the following materials in percentage by weight: 13% of modified resin, 22% of reinforcing material fiber, 8% of toughening agent, 20% of antiwear lubricant, 11% of drilling material, 5% of metal sulfide, 4% of grinding agent and 17% of space filler.
Further, the material formula of the modified resin comprises the following components in percentage by weight: 40% of cashew nut shell oil modified resin and 60% of butyronitrile modified resin.
Further, the material formula of the reinforced material fiber comprises the following components in percentage by weight: 60% of composite mineral fiber, 35% of BMC-3.0 type alkali-free glass fiber and 5% of cellulose fiber.
Further, the material formula of the toughening agent comprises the following components in percentage by weight: 60% of butyronitrile rubber powder and 40% of butylbenzene rubber powder.
Further, the material formula of the anti-wear lubricant comprises the following components in percentage by weight: 40% of natural crystalline flake graphite, 40% of needle coke and 20% of coke powder.
And further, drilling the reclaimed material after the friction plate is drilled.
Further, the material formula of the metal sulfide comprises the following components in percentage by weight: 50% of pyrite, 30% of copper sulfide and 20% of molybdenum disulfide.
Further, the grinding agent comprises the following materials in percentage by weight: 70% of zircon powder and 30% of high-aluminum fine powder.
Further, the material formula of the space filler comprises the following components in percentage by weight: 50% of precipitated barium sulfate, 30% of light calcium carbonate and 20% of sericite.
Example 2
A large flat plate special-shaped friction plate for engineering machinery comprises the following materials in percentage by weight: 12% of modified resin, 25% of reinforcing material fiber, 7% of toughening agent, 18% of antiwear lubricant, 10% of drilling material, 8% of metal sulfide, 4% of grinding agent and 16% of space filler.
Further, the material formula of the modified resin comprises the following components in percentage by weight: 50% of cashew nut shell oil modified resin and 50% of butyronitrile modified resin.
Further, the material formula of the reinforced material fiber comprises the following components in percentage by weight: 50% of composite mineral fiber, 40% of BMC-3.0 type alkali-free glass fiber and 10% of cellulose fiber.
Further, the material formula of the toughening agent comprises the following components in percentage by weight: 50% of butyronitrile rubber powder and 50% of butylbenzene rubber powder.
Further, the material formula of the anti-wear lubricant comprises the following components in percentage by weight: 50% of natural crystalline flake graphite, 35% of needle coke and 15% of coke powder.
And further, drilling the reclaimed material after the friction plate is drilled.
Further, the material formula of the metal sulfide comprises the following components in percentage by weight: 40% of pyrite, 30% of copper sulfide and 30% of molybdenum disulfide.
Further, the grinding agent comprises the following materials in percentage by weight: 65% of zircon powder and 35% of high-aluminum fine powder.
Further, the material formula of the space filler comprises the following components in percentage by weight: 50% of precipitated barium sulfate, 35% of light calcium carbonate and 15% of sericite.
Example 3
A large flat plate special-shaped friction plate for engineering machinery comprises the following materials in percentage by weight: 12.5 percent of modified resin, 23 percent of reinforcing material fiber, 6 percent of toughening agent, 16 percent of antiwear lubricant, 13 percent of drilling material, 6 percent of metal sulfide, 4.5 percent of grinding agent and 19 percent of space filler.
Further, the material formula of the modified resin comprises the following components in percentage by weight: 45% of cashew nut shell oil modified resin and 55% of butyronitrile modified resin.
Further, the material formula of the reinforced material fiber comprises the following components in percentage by weight: 55% of composite mineral fiber, 30% of BMC-3.0 type alkali-free glass fiber and 15% of cellulose fiber.
Further, the material formula of the toughening agent comprises the following components in percentage by weight: 55% of butyronitrile rubber powder and 45% of butylbenzene rubber powder.
Further, the material formula of the anti-wear lubricant comprises the following components in percentage by weight: 55% of natural crystalline flake graphite, 25% of needle coke and 20% of coke powder.
And further, drilling the reclaimed material after the friction plate is drilled.
Further, the material formula of the metal sulfide comprises the following components in percentage by weight: 45% of pyrite, 30% of copper sulfide and 25% of molybdenum disulfide.
Further, the grinding agent comprises the following materials in percentage by weight: 60% of zircon powder and 40% of high-alumina fine powder.
Further, the material formula of the space filler comprises the following components in percentage by weight: 40% of precipitated barium sulfate, 40% of light calcium carbonate and 20% of sericite.
Based on the embodiment, the preparation method of the large flat plate special-shaped friction plate for the engineering machinery based on the claims is further provided, and comprises the following preparation steps:
(1) preparing materials: accurately weighing the raw materials of the components of the material formula of the special-shaped friction plate according to the weight percentage for standby:
(2) mixing materials: putting the weighed raw materials of each component into a plow harrow type high-speed mixer, wherein the mixing time is 8-10 min;
(3) molding: weighing the mixture according to the thickness requirement of the special-shaped friction plate and the density calculation of the mixture, pouring the mixture into a hot-pressing mold, and setting the hot-pressing pressure to be 200-300 kg.f/cm2The hot pressing temperature is 145-155 ℃, gas is exhausted once every 20-30 s of pressing, 5-6 times of gas is exhausted in total, and the pressure maintaining time is 600-900 s;
(4) and (3) heat treatment: heating the hot-press formed brake pad from room temperature to 145-155 ℃ within 4-5 h, preserving heat for 6-8 h, and then stopping heating until the temperature of the oven is cooled to below 50 ℃;
(5) post-processing: and then placing the friction plate with the thickness of 500mm multiplied by 500mm manufactured by the process on a plane abrasive belt grinding machine according to the technical requirements to be ground to the standard thickness, then marking, inspecting and packaging after processing to obtain the friction plate.
Referring to fig. 1-2, a large flat plate special-shaped mold for an engineering machine is further provided for the above large flat plate special-shaped friction plate for an engineering machine and the preparation method of the friction plate: the hydraulic press comprises a base, a top seat, a hydraulic press, a top sliding seat, a top die assembly, a bottom die assembly and a middle die assembly, wherein the periphery of the upper end surface of the base is fixedly connected with the top seat through a fixing column; the top die assembly comprises a top die base fixedly arranged on the lower end face of the top mounting platform; the bottom die assembly comprises a bottom die base fixedly arranged on the upper end surface of the bottom mounting platform; the middle die assembly is distributed between the top die assembly and the bottom die assembly and comprises a middle die base; the die cavity is arranged on the upper end surfaces of the middle die holder and the bottom die holder, the die heads for inserting into the die cavities are respectively distributed on the lower end surfaces of the top die holder and the middle die holder, and the cylinders are respectively arranged on two sides of the middle die holder and the bottom die holder and are used for jacking the middle die holder to facilitate film ejection.
In the invention, the large flat plate special-shaped friction plate designed and prepared by the invention has high static friction force, can increase the movement friction resistance of engineering machinery and prevent the mechanical sliding, and the developed friction plate formula can also be used for the production and the manufacture of a parking brake, meets the production requirements, can realize large-scale production, is beneficial to improving the customer satisfaction degree, and has good applicability and popularization.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. A large flat plate special-shaped friction plate for engineering machinery is characterized in that the material formula of the special-shaped friction plate is as follows by weight percent: 8-13% of modified resin, 15-25% of reinforcing material fiber, 4-10% of toughening agent, 10-20% of wear-resistant lubricant, 10-15% of drilling material, 5-8% of metal sulfide, 3-8% of grinding agent and 10-25% of space filler.
2. The large flat plate special-shaped friction plate for the engineering machinery as claimed in claim 1, wherein the material formula of the modified resin comprises the following components in percentage by weight: 40-60% of cashew nut shell oil modified resin and 40-60% of butyronitrile modified resin.
3. The large flat plate special-shaped friction plate for the engineering machinery as claimed in claim 1, wherein the material formula of the reinforcing material fiber comprises the following components in percentage by weight: 50-60% of composite mineral fiber, 30-40% of BMC-3.0 type alkali-free glass fiber and 5-10% of cellulose fiber.
4. The large flat plate special-shaped friction plate for the engineering machinery as claimed in claim 1, wherein the material formula of the toughening agent comprises the following components in percentage by weight: 40-60% of butyronitrile rubber powder and 40-50% of butylbenzene rubber powder.
5. The large flat plate special-shaped friction plate for engineering machinery as claimed in claim 1, wherein the material formulation of the antiwear lubricant is calculated by weight percentage as follows: 40-60% of natural crystalline flake graphite, 20-40% of needle coke and 10-20% of coke powder.
6. The large flat plate special-shaped friction plate for engineering machinery as claimed in claim 1, wherein the recovered material after drilling the friction plate is drilled.
7. The large flat plate special-shaped friction plate for the engineering machinery as claimed in claim 1, wherein the material formula of the metal sulfide is calculated by weight percent: 40-50% of pyrite, 20-30% of copper sulfide and 20-30% of molybdenum disulfide.
8. The large flat plate special-shaped friction plate for the engineering machinery as claimed in claim 1, wherein the material formula of the grinding enhancer comprises the following components in percentage by weight: 60-70% of zircon powder and 30-40% of high-alumina fine powder;
the material formula of the space filler comprises the following components in percentage by weight: 40-60% of precipitated barium sulfate, 30-40% of light calcium carbonate and 20-30% of sericite.
9. The method for preparing the large flat plate special-shaped friction plate for the engineering machinery based on the claims is characterized by comprising the following preparation steps:
(1) preparing materials: accurately weighing the raw materials of the components of the material formula of the special-shaped friction plate according to the weight percentage for standby:
(2) mixing materials: putting the weighed raw materials of each component into a plow harrow type high-speed mixer, wherein the mixing time is 8-10 min;
(3) molding: weighing the mixture according to the thickness requirement of the special-shaped friction plate and the density calculation of the mixture, pouring the mixture into a hot-pressing mold, and setting the hot-pressing pressure to be 200-300 kg.f/cm2The hot pressing temperature is 145-155 ℃, gas is exhausted once every 20-30 s of pressing, 5-6 times of gas is exhausted in total, and the pressure maintaining time is 600-900 s;
(4) and (3) heat treatment: heating the hot-press formed brake pad from room temperature to 145-155 ℃ within 4-5 h, preserving heat for 6-8 h, and then stopping heating until the temperature of the oven is cooled to below 50 ℃;
(5) post-processing: and then placing the friction plate with the thickness of 500mm multiplied by 500mm manufactured by the process on a plane abrasive belt grinding machine according to the technical requirements to be ground to the standard thickness, then marking, inspecting and packaging after processing to obtain the friction plate.
10. A large flat plate special-shaped die for engineering machinery for preparing the friction plate is characterized by comprising a base, a top seat, a hydraulic machine, a top sliding seat, a top die assembly, a bottom die assembly and a middle die assembly;
the periphery of the upper end face of the base is fixedly connected with the top seat through a fixing column, the top seat is provided with a hydraulic machine, and the telescopic end of the hydraulic machine is fixedly connected with the upper end face of the top sliding seat; the periphery of the top sliding seat is sleeved on the fixed column in a vertically sliding mode, the lower end face of the top sliding seat is fixedly provided with a top mounting platform, and the upper end face of the base is fixedly provided with a bottom mounting platform;
the top die assembly comprises a top die base fixedly arranged on the lower end face of the top mounting platform; the bottom die assembly comprises a bottom die base fixedly arranged on the upper end surface of the bottom mounting platform; the middle die assembly is distributed between the top die assembly and the bottom die assembly and comprises a middle die holder;
the die comprises a middle die holder, a bottom die holder and a top die holder, wherein the middle die holder is arranged on the upper end face of the middle die holder, the bottom die holder is arranged on the lower end face of the middle die holder, the top die holder and the bottom die holder are respectively provided with a die head used for being inserted into the die cavities, and the cylinders are used for jacking the middle die holder to facilitate the film ejection.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114654407A (en) * | 2022-04-29 | 2022-06-24 | 浙江玛拓驱动设备有限公司 | Friction plate machining tool and using method thereof |
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| CN113124076A (en) * | 2021-04-20 | 2021-07-16 | 安徽飞鹰汽车零部件股份有限公司 | Low-resin-based aramid pulp wear-resistant disc brake pad and preparation method thereof |
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| CN101813150A (en) * | 2010-05-20 | 2010-08-25 | 湖南博云汽车制动材料有限公司 | Ceramic fiber reinforced ceramic matrix automotive brake friction material and preparation method thereof |
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Denomination of invention: A large flat irregular friction plate for construction machinery, preparation method, and mold Effective date of registration: 20230828 Granted publication date: 20230609 Pledgee: China Construction Bank Corporation Ningguo sub branch Pledgor: Anhui Feiying Auto Parts Co.,Ltd. Registration number: Y2023980054090 |
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