CN101839294B - Nonmetal ceramic matrix drum brake pad for bus and preparation method thereof - Google Patents
Nonmetal ceramic matrix drum brake pad for bus and preparation method thereof Download PDFInfo
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- CN101839294B CN101839294B CN 201010178821 CN201010178821A CN101839294B CN 101839294 B CN101839294 B CN 101839294B CN 201010178821 CN201010178821 CN 201010178821 CN 201010178821 A CN201010178821 A CN 201010178821A CN 101839294 B CN101839294 B CN 101839294B
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Abstract
The invention discloses a nonmetal ceramic matrix drum brake pad for a bus and a preparation method thereof. The production flow is as follows: sequentially weighting 20 to 40 nonmetal composite fiber, 10 to 20 friction performance regulator, 20 to 30 vitrified bond, 0 to 5 heat conductivity fiber, 5 to 10 elastic flexibilizer and 10 to 20 filling and placing in a high speed blend mixer to be mixed evenly; then pressing, thermocuring processing, final machining and vitrified processing; and completing checking and package according to the dry-press process technology of traditional resin matrix friction material. The nonmetal ceramic matrix drum brake pad manufactured according to the technology has the advantages of agile emergency brake, comfortable and steady performance, no noise, little dust accumulation, good economical performance, simple production technology and environmental protection and is particularly applicable to civil buses.
Description
Technical field
The present invention relates to automobile friction material technical field, be specifically related to a kind of drum-type brake pad, particularly a kind of nonmetal ceramic matrix drum brake pad for city bus braking with and preparation method thereof.
Background technique
The city bus brake more frequently can cause the brake block excess Temperature, finally causes brake block to descend and expanded by heating because of braking force, and serious can cause the brake system locking.In addition, city bus is compared (such as car, lorry etc.) with other vehicle, and comparatively special requirement is arranged, because it does not generally allow noise and more dust mainly in the urban inner operation.Mainly there is following subject matter in employed brake block on China's bus at present:
1, heat fade is larger
The city bus brake is more frequent, can cause brake block heating (temperature is up to more than 350 ℃), thereby causes friction factor to reduce, and the heat fade phenomenon occurs, affects the stability of braking force.
2, emergency sensitiveness is not high
At present, domestic city bus ubiquity emergency braking situation is more, therefore require friction plate to have more suitable Young's modulus and the mating plate stickiness is better.
3, brake noise is large
The bus brake noise also is a kind of very general phenomenon.More and more higher along with urban environment is required, to the also constantly higher requirement of proposition of brake noise of automobile.The city that has has at present just proposed the auto Not Permitted brake noise.
Summary of the invention
First technical problem to be solved by this invention provides that a kind of emergency braking is sensitive, comfortable steadily, the nonmetal ceramic matrix drum brake pad for bus of noise free, few ash that falls.
Second technical problem to be solved by this invention provides a kind of preparation method of this nonmetal ceramic matrix drum brake pad for bus.
In order to solve above-mentioned first technical problem, nonmetal ceramic matrix drum brake pad for bus provided by the invention, its material prescription is by weight percentage:
Vitrified bond 20～30, composite fiber 20～30,
Carbon fiber 0～5, glass fibre 0～5,
Brass fiber 0～5, chromite 0～5,
Artificial graphite 0～7, crystalline flake graphite 7～14,
Friction powder 4～10, rubber 2～5,
Composite filling 5～10, Paris white 2～4.
In order to solve above-mentioned second technical problem, the preparation method of this nonmetal ceramic matrix drum brake pad for bus provided by the invention comprises the steps:
(1), batch mixing: the order that load weighted each material is dropped in the high speed mixer is: first nonmetal, compound fibric, frictional property regulator are carried out premixing, guarantee that composite fiber is in homogeneously dispersed state, then add other raw and auxiliary material, carry out uniform stirring;
(2), cold pressing; Pressing pressure 100～200kgf/cm
2
(3), hot pressing: pressing pressure 200～300kgf/cm
2, 150～160 ℃ of hot pressing temperatures, exhaust 5～8 times, the dwell time decides according to the thickness of brake block, generally is 55～65s/mm;
(4), the brake block after the moulding was warmed up to 155～165 ℃ at 1.8～2.2 hours from room temperature, be incubated 4～8 hours, then cool to room temperature with the furnace;
(5), the brake block after the heat treatment is ground inside and outside arc, boring by technical requirements, then under 300～400 ℃ temperature, carry out ceramic treatment, marking, check, packing.
Adopting nonmetal ceramic matrix drum brake pad for bus of technique scheme and preparation method thereof, is that the characteristics in conjunction with city bus have proposed nonmetal ceramic matrix drum brake pad on traditional asbestos and resin base drum-type brake pad basis.Adopt the nonmetal ceramic matrix drum brake pad for bus of technique scheme preparation, with respect to traditional resin base automobile brake sheet, have the emergency braking sensitivity, comfortable steadily, noise free, less fall ash, good economy performance, be specially adapted to city bus.
In sum, the present invention is a kind of non-metal ceramic-based automobile brake sheet that is applicable to the city bus braking, preparation method's simple possible of this non-metal ceramic-based automobile brake sheet.
Embodiment
The invention will be further described below in conjunction with embodiment.
Embodiment 1:
Artificial gold 30, aramid fibre 2,
Mineral fibre 28, carbon fiber 3,
Glass fibre 3, brass fiber 5,
Chromite 4, artificial graphite 4,
Crystalline flake graphite 8, friction powder 4,
Rubber 2, composite filling 5,
Paris white 2.
In this formula system, vitrified bond mainly is the inorganic high-temperature agglomerants such as metal sulfide, can significantly improve the heat resistance of material, reduce material wear extent at high temperature, and can make material form mesh structural porous structure, and increase the braking stationarity, reduce brake noise.For continuing to continue to use moulding process and the manufacturing mechanism of resin base automobile brake sheet, add a small amount of resin and rubber, to reduce equipment investment and cost of production.
Composite fiber has good dispersiveness and adsorptivity, outstanding especially is, with resin, frictional property regulator and other fibers in the friction material formulation good compatibility is arranged, this is the basis that it can effectively strengthen, and this is similar with the mechanism that the 6-10 asbestos strengthen.
Carbon fiber is that carbon content is higher than 90% inorganic polymer fiber, and thermal expansion coefficient is little, good corrosion resistance, and the density of fiber is low.
Glass fibre has higher tensile strength, can be because variation of ambient temperature do not change, and the thermal conductivity of glass fibre is very little, and good heat resistance is arranged.Can remedy the shortcoming of nonmetal prescription strength deficiency.
During graphite is used as, low temperature lubricant, form the antifriction film at material surface, can reduce the difference between the coefficient of sliding friction and the coefficient of kinetic friction, thereby reduce the generation of noise between brake block and antithesis.Friction powder and rubber can increase the braking stationarity, improve porosity ratio, reduce brake noise, improve the effect of brake travelling comfort.Chromite can improve friction factor, increases Braking efficiency.Composite fillings etc. are except playing the effect that reduces cost, and the porosity ratio that can also regulate material improves the braking travelling comfort.
The preparation process of used for buses non-metal ceramic-based automobile brake sheet comprises the steps:
(1), batch mixing: the order that load weighted each material is dropped in the high speed mixer is: first nonmetal, compound fibric, frictional property regulator are carried out premixing, guarantee that composite fiber is in homogeneously dispersed state, then add other raw and auxiliary material, carry out uniform stirring;
(2), cold pressing; Pressing pressure 100～200kgf/cm
2
(3), hot pressing: pressing pressure 200kgf/cm
2, 150 ℃ of hot pressing temperatures, exhaust 5 times, the dwell time decides according to the thickness of brake block, generally is 55s/mm;
(4), the brake block after the moulding was warmed up to 160 ℃ at 2 hours from room temperature, be incubated 4 hours, then cool to room temperature with the furnace;
(5), the brake block after the heat treatment is ground inside and outside arc, boring by technical requirements, then under 300 ℃ temperature, carry out ceramic treatment, marking, check, packing.
The performance of nonmetal ceramic matrix drum brake pad for bus
By GB5763-2008 non-metal ceramic-based and conventional resins base used for buses drum-type liner have been carried out fixed speed fricting test, test result is seen Fig. 1.
As can be seen from Table 1, the friction factor of nonmetal ceramic matrix drum brake pad from 100 ℃ to 350 ℃ variation less, wear rate rising with temperature before 250 ℃ is in rising trend, the wear rate of material decreases on the contrary with the rising of temperature after 250 ℃, on the rubbing surface without oil film, the brake pad surface is complete, flawless; The friction factor of conventional resins base brake block raise with temperature before 250 ℃, and decline is slightly large during high temperature, high temperature abrasion resistance is relatively poor, one deck oil film is arranged on the rubbing surface, and crackle appears in the brake pad surface.In the constant speed test, the combination property of nonmetal ceramic matrix drum brake pad is apparently higher than the conventional resins based drum-type brake pad.
As can be seen from Table 2, non-metal ceramic-based drum-type liner is satisfying on the friction and wear behavior basis, have the mechanical propertys such as more excellent shock resistance, counter-bending, compressive resistance, can guarantee the stability of Security and the emergency braking of the normal service brake of city bus.
Situation is tried on the entrucking road, carries out the examination of entrucking road in city's bus public transport company, and the reflection braking is sensitive, steady, noise free.Open and inspect, there is complete transfer film on the brake block surface without oil film, and the brake drum surface light is smooth.
Non-metal ceramic-based and the conventional resins base drum-type liner constant speed test result of table 1 used for buses
Table 2 used for buses is non-metal ceramic-based to be contrasted with conventional resins based drum-type brake pad physical and mechanical properties
Embodiment 2:
Artificial gold 20, aramid fibre 3,
Mineral fibre 27, carbon fiber 2,
Glass fibre 2, brass fiber 5,
Chromite 4, artificial graphite 7,
Crystalline flake graphite 14, friction powder 8,
Rubber 4, composite filling 10,
Paris white 4.
Embodiment 2 preparation methods are with embodiment 1, and table 3 is the constant speed experimental tests result of embodiment's 2 preparation brake blocks:
The constant speed experimental result of table 3 embodiment 2 brake blocks
Embodiment 3:
Artificial gold 20, aramid fibre 1,
Mineral fibre 29, carbon fiber 3,
Glass fibre 3, brass fiber 5,
Chromite 2, artificial graphite 5,
Crystalline flake graphite 10, friction powder 10,
Rubber 5, composite filling 5,
Paris white 2.
Embodiment 3 preparation methods are with embodiment 1, and table 4 is the constant speed experimental tests result of embodiment's 3 preparation brake blocks:
The constant speed experimental result of table 4 embodiment 3 brake blocks
Embodiment 4:
Artificial gold 30, aramid fibre 2,
Mineral fibre 18, carbon fiber 2,
Glass fibre 2, brass fiber 0,
Chromite 5, artificial graphite 7,
Crystalline flake graphite 14, friction powder 4,
Rubber 2, composite filling 10,
Paris white 4.
Embodiment 4 preparation methods are with embodiment 1, and table 5 is the constant speed experimental tests result of embodiment's 4 preparation brake blocks:
The constant speed experimental result of table 5 embodiment 4 brake blocks
Claims (1)
1. the preparation method of a nonmetal ceramic matrix drum brake pad for bus, its material prescription is by weight percentage: nonmetal, compound fibric 20-40, frictional property regulator 10-20, vitrified bond 20-30, thermal conductivity fiber 0-5, elasticity plasticizer 5-10, filler 10-20, wherein: described vitrified bond refers to the metal sulfide inorganic high-temperature agglomerant; Described nonmetal, compound fibric is comprised of composite fiber, carbon fiber and glass fibre, and its weight proportion is carbon fiber: glass fibre: composite fiber=1:1:10; Composite fiber is comprised of aramid fibre, mineral fibre; Described thermal conductivity fiber is brass fiber; Described frictional property regulator comprises increasing grinding agent, is comprised of the chromite powder of quality 0-5%, also comprises oiling agent, is comprised of the weight proportion of artificial graphite and crystalline flake graphite 1:2; Described elasticity plasticizer is comprised of friction powder and rubber, and its weight proportion is friction powder: rubber=2:1; Described filler is comprised of composite filling and calcium carbonate, its weight proportion is composite filling: calcium carbonate=5:2, and material prescription counts by weight percentage and is vitrified bond 20～30, composite fiber 20～30, carbon fiber 2～3, glass fibre 2～3, brass fiber 0～5, chromite 0～5, artificial graphite 3.5～7, crystalline flake graphite 7～14, friction powder 4～10, rubber 2～5, composite filling 5～10, Paris white 2～4 is characterized in that: comprise the steps:
(1), batch mixing: the order that load weighted each material is dropped in the high speed mixer is: first nonmetal, compound fibric, frictional property regulator are carried out premixing, guarantee that composite fiber is in homogeneously dispersed state, then add other raw and auxiliary material, carry out uniform stirring;
(2), cold pressing; Pressing pressure 100～200kgf/cm
2
(3), hot pressing: pressing pressure 200～300kgf/cm
2, 150～160 ℃ of hot pressing temperatures, exhaust 5～8 times, the dwell time decides according to the thickness of brake block, and the dwell time is 55～65s/mm;
(4), the brake block after the moulding was warmed up to 155～165 ℃ at 1.8～2.2 hours from room temperature, be incubated 4～8 hours, then cool to room temperature with the furnace;
(5), the brake block after the heat treatment is ground inside and outside arc, boring by technical requirements, then 300～400
℃ temperature under carry out ceramic treatment, marking, check, packing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010178821 CN101839294B (en) | 2010-05-20 | 2010-05-20 | Nonmetal ceramic matrix drum brake pad for bus and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010178821 CN101839294B (en) | 2010-05-20 | 2010-05-20 | Nonmetal ceramic matrix drum brake pad for bus and preparation method thereof |
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| CN101839294A CN101839294A (en) | 2010-09-22 |
| CN101839294B true CN101839294B (en) | 2013-01-09 |
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| CN 201010178821 Expired - Fee Related CN101839294B (en) | 2010-05-20 | 2010-05-20 | Nonmetal ceramic matrix drum brake pad for bus and preparation method thereof |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102229493B (en) * | 2011-04-13 | 2013-07-10 | 中南大学 | Resin-free full ceramic based automobile brake pad and preparation method thereof |
| CN102678798B (en) * | 2012-04-13 | 2015-08-05 | 江苏安捷汽车配件有限公司 | A kind of manufacture method of automobile brake sheet |
| CN103291789B (en) * | 2013-06-05 | 2016-01-20 | 安徽宝途汽车零部件有限公司 | A kind of preparation method of automobile friction |
| CN103629281A (en) * | 2013-11-15 | 2014-03-12 | 宁国飞鹰汽车零部件股份有限公司 | Ceramic high-performance disc brake pad for bus and manufacturing method thereof |
| CN105546003A (en) * | 2016-03-02 | 2016-05-04 | 英义们 | Full-soft brake pad for urban bus |
| CN105757146B (en) * | 2016-03-29 | 2018-05-15 | 英义们 | Explosion-proof composite soft skidding brake shoe |
| CN105864331B (en) * | 2016-06-01 | 2018-03-20 | 江苏金麦穗新能源科技股份有限公司 | A kind of building waste inserts brake block friction material production technology |
| CN106870608A (en) * | 2017-03-01 | 2017-06-20 | 杭州安耐特实业有限公司 | A kind of Graphene brake pad material and its manufacture method |
Citations (4)
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|---|---|---|---|---|
| JP2000219750A (en) * | 1999-02-02 | 2000-08-08 | Akebono Brake Ind Co Ltd | Friction material for brake |
| CN101113204A (en) * | 2007-07-17 | 2008-01-30 | 李军魂 | Formula of ceramic radical friction material for automobile braking friction facing |
| CN101487505A (en) * | 2009-02-23 | 2009-07-22 | 宁国飞鹰汽车零部件股份有限公司 | Asbestos-free metal-free composite lubrication type drum-shaped brake block for cars and method for producing the same |
| CN101509531A (en) * | 2009-03-27 | 2009-08-19 | 孟兆敏 | Method for producing low temperature cured ceramic friction plate |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10330732A (en) * | 1997-06-04 | 1998-12-15 | Hitachi Chem Co Ltd | Friction material composition and friction material made therefrom |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000219750A (en) * | 1999-02-02 | 2000-08-08 | Akebono Brake Ind Co Ltd | Friction material for brake |
| CN101113204A (en) * | 2007-07-17 | 2008-01-30 | 李军魂 | Formula of ceramic radical friction material for automobile braking friction facing |
| CN101487505A (en) * | 2009-02-23 | 2009-07-22 | 宁国飞鹰汽车零部件股份有限公司 | Asbestos-free metal-free composite lubrication type drum-shaped brake block for cars and method for producing the same |
| CN101509531A (en) * | 2009-03-27 | 2009-08-19 | 孟兆敏 | Method for producing low temperature cured ceramic friction plate |
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