CN101907141A - Method for manufacturing composition brake shoe with powder metallurgy inserts - Google Patents

Method for manufacturing composition brake shoe with powder metallurgy inserts Download PDF

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Publication number
CN101907141A
CN101907141A CN2010102274239A CN201010227423A CN101907141A CN 101907141 A CN101907141 A CN 101907141A CN 2010102274239 A CN2010102274239 A CN 2010102274239A CN 201010227423 A CN201010227423 A CN 201010227423A CN 101907141 A CN101907141 A CN 101907141A
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powder metallurgy
brake shoe
metallurgy inserts
inserts
friction material
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CN101907141B (en
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邹怀森
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Beijing Railway Star Fortune High Tech Co ltd
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BEIJING QIUZHIYI DATA Co Ltd
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Abstract

The embodiment of the invention provides a method for manufacturing a composition brake shoe with powder metallurgy inserts. The method comprises the following steps of: welding powder metallurgy inserts of which the hardness and the friction properties are matched with a high polymer composite friction material at two ends of steel backing; integrally pressing the high polymer composite friction material and the powder metallurgy inserts through cold press molding to form a friction surface of the composition brake shoe; and solidifying the cold press molded composition brake shoe and polishing the inner arc surface of the friction body to obtain the composition brake shoe with the powder metallurgy inserts. The invention can obviously improve the heat conducting properties of the composition brake shoe, reduce the heatfade of the composition brake shoe and guarantee the composition brake shoe to have stable friction properties during braking.

Description

A kind of making method that has the composite brake shoe of powder metallurgy inserts
Technical field
The present invention relates to train and use the brake shoe field, relate in particular to a kind of making method that has the composite brake shoe of powder metallurgy inserts.
Background technique
At present, railway is the important foundation facility of country, the main artery and the popular traffic tool of national economy, repeatedly speed raising along with railway, railway freight-car develops to the direction of high speed, heavy duty, under the situation that guarantees emergency stopping distance, increase, the raising of speed and the increase of trailing weight that axle is heavy are all had higher requirement to braking device and brake material.Wherein, brake shoe provides frictional force during as train braking, carries out the main parts size of transformation of energy, and requirement should have higher mechanical strength, good heat resistance and thermal conductivity, stable frictional behaviour, lower wearing and tearing and reduce abrasion and fire damage to wheel.
Employed brake shoe material is broadly divided into cast iron brake shoe, composite brake shoe and powder metallurgy brake block three classes in the prior art.Powder metallurgy friction material has the friction factor height, thermal conductivity is good, and good stability is not influenced by sleety weather and the advantage such as little of wearing and tearing, but powder metallurgy brake block is comparatively serious to the wearing and tearing of wheel, and cost is than composite brake shoe height.In order to overcome above-mentioned performance deficiency, a lot of countries have all begun the research work of composite brake shoe after the forties in last century, compare with powder metallurgy brake block, composite brake shoe has advantages such as adjustable, the required braking force of friction factor is little, no-spark, quality is little, the little life-span of abrasion is long.But the body material poor heat resistance of composite brake shoe in the prior art, the heat fade phenomenon is arranged, even more serious is that heat-conducting property is poor, will cause the Organizational Structure of wheel material to change like this, can make when serious wheel tread produce hot crack, heat crack, hot soarfing from etc. phenomenon, influenced the use of brake shoe.
Summary of the invention
The embodiment of the invention provides a kind of making method that has the composite brake shoe of powder metallurgy inserts, can significantly improve the heat-conducting property of composite brake shoe, reduces the heat fade of composite brake shoe, has stable frictional behaviour when guaranteeing the composite brake shoe braking; In braking process, can effectively conduct the frictional heat that wheel tread and brake shoe friction piece produce in braking process simultaneously, reduce fire damage, prevent that wheel heat crackle, heat crack, hot soarfing are from generation wheel.
The embodiment of the invention provides a kind of making method that has the composite brake shoe of powder metallurgy inserts, and described method comprises:
The powder metallurgy inserts that hardness, frictional behaviour and described macromolecule composite friction material are complementary is welded on the two ends of steel backing;
By cold moudling described macromolecule composite friction material and described powder metallurgy inserts are pressed into integral body, constitute the rubbing surface of composite brake shoe;
Described composite brake shoe to cold moudling is cured, and after the friction piece intrados carried out grinding process, obtains to have the composite brake shoe of powder metallurgy inserts.
Described macromolecule composite friction material forms by the banburying granulation according to the each component of following weight ratio, and the each component of described weight ratio is:
5～7% resol, 8～12% nitrile butadiene rubbers, 15～25% Steel Fibres, 6～12% magnesium oxide, 5～8% petroleum cokes, 20～35% mineral fibre, 2～5% graphite, 0.1～0.4% hexamethylenetetramine, 0.1～0.5% sulphur, 0.05～0.1% tetramethylthiuram disulfide, 0.5～2% carbon black and 1～1.5% potassic feldspar.
The process of described banburying granulation specifically comprises:
In the each component input kneading type banbury with described weight ratio, by banburying heating 3～5 minutes, and cleaning, banburying were regulated 3～5 minutes; Wherein, in described banburying processing procedure, temperature is controlled at 80～120 ℃, pressure control at 5～7Mpa;
Get rid of mixture, and after breaking process, obtaining described macromolecule composite friction material.
Described powder metallurgy inserts is divided by weight, and main component comprises:
60%～65% copper, 2%～5% iron, 2%～76% tin, 1～2% graphite, 2%～4% lead, 2～4% silica, 1～4% barium sulphate, 1～2% molybdenum disulfide.
The side of described powder metallurgy inserts has dovetail groove, and described powder metallurgy inserts is designed to wedge shape;
The width of described powder metallurgy inserts is less than the width of described steel backing, wherein an end aligns with steel backing, the other end leaves the space of about 10mm, and described powder metallurgy inserts is evenly distributed on described steel backing, guarantees that described powder metallurgy inserts all contacts with whole metal tread.
The process of described cold moudling specifically comprises:
Pressurize on hydraulic press being welded with the steel backing of described powder metallurgy inserts and the brake shoe mould of described macromolecule composite friction material, and pressurize more than 120 seconds with moulding.
Described solidification technical process specifically comprises:
The composite brake shoe of cold moudling is incubated 1 hour in 100 ℃ of baking ovens, be warming up to 170 ℃ of insulations 4 hours then, be warming up to 180 ℃ of insulations 15 hours again, and after insulation finishes, open described baking oven, keep blower normally to move, by below the air cooling to 80 ℃.
By the above-mentioned technological scheme that provides as can be seen, the powder metallurgy inserts that at first hardness, frictional behaviour and described macromolecule composite friction material is complementary of this method is welded on the two ends of steel backing; By cold moudling described macromolecule composite friction material and described powder metallurgy inserts are pressed into integral body, constitute the rubbing surface of composite brake shoe; Described composite brake shoe to cold moudling is cured, and after the friction piece intrados carried out grinding process, obtains to have the composite brake shoe of powder metallurgy inserts.By the enforcement of technique scheme, just can significantly improve the heat-conducting property of composite brake shoe, reduce the heat fade of composite brake shoe, have stable frictional behaviour when guaranteeing the composite brake shoe braking; Simultaneously in braking process, can effectively conduct the frictional heat that wheel tread and brake shoe friction piece produce in braking process, reduction is to the fire damage of wheel, prevent wheel heat crackle, heat crack, hot soarfing from generation.
Description of drawings
Fig. 1 provides the schematic flow sheet of the making method of the composite brake shoe that has powder metallurgy inserts for the embodiment of the invention;
Fig. 2 provides the structural representation of powder metallurgy inserts side for the embodiment of the invention;
Fig. 3 is the distribution schematic diagram of powder metallurgy inserts that the embodiment of the invention provides at steel backing.
Embodiment
The embodiment of the invention provides a kind of making method that has the composite brake shoe of powder metallurgy inserts, at powder metallurgy brake block and composite brake shoe pluses and minuses separately, combine macromolecule composite friction material and powder metallurgy inserts are effective, integrate powder metallurgy brake block and composite brake shoe advantage separately, improved the combination property of high friction composite brake shoe.This composite brake shoe can significantly improve the heat-conducting property of brake shoe, reduces the heat fade of composite brake shoe, has guaranteed frictional behaviour stable when composite brake shoe is braked; Simultaneously in braking process, can effectively conduct the frictional heat that wheel tread and brake shoe friction piece produce in braking process, reduction is to the fire damage of wheel, prevent wheel heat crackle, heat crack, hot soarfing from generation.This novel composite brake shoe in braking process, the effective foreign matter that is mingled with between sweeper wheel tread and brake shoe, removing may produce the metal filings of damascene, effectively suppresses the damascene phenomenon of composite brake shoe.
For better describing the embodiment of the invention, now in conjunction with the accompanying drawings the specific embodiment of the present invention is described, be illustrated in figure 1 as the making method schematic flow sheet of composite brake shoe that the embodiment of the invention provides, described method comprises:
Step 11: the powder metallurgy inserts that hardness, frictional behaviour and described macromolecule composite friction material are complementary is welded on the two ends of steel backing.
In this step, at first the powder metallurgy inserts that hardness, frictional behaviour and macromolecule composite friction material are complementary is welded on the two ends of steel backing, and described here being complementary refers to frictional behaviour and heat-conducting property is complementary.Wherein, this macromolecule composite friction material can form according to the each component of the following weight ratio technology mode by the banburying granulation, and the each component of described weight ratio includes:
5～7% resol, 8～12% nitrile butadiene rubber, 15～25% Steel Fibre, 6～12% magnesium oxide, 5～8% petroleum coke, 20～35% mineral fibre, 2～5% graphite, 0.1～0.4% hexamethylenetetramine, 0.1～0.5% sulphur, 0.05～0.1% tetramethylthiuram disulfide TMTD, 0.5～2% carbon black and 1～1.5% potassic feldspar.
The manufacturing process of above-mentioned banburying granulation specifically comprises:
In the each component input kneading type banbury with described weight ratio, by banburying heating 3～5 minutes, and cleaning, banburying were regulated 3～5 minutes; Wherein, in described banburying processing procedure, temperature is controlled at 80～120 ℃, pressure control at 5～7Mpa; Get rid of mixture, and after breaking process, obtaining described macromolecule composite friction material.
In addition, above-mentioned powder metallurgy inserts is divided according to weight, and its main component comprises:
60%～65% copper, 2%～5% iron, 2%～76% tin, 1～2% graphite, 2%～4% lead, 2～4% silica, 1～4% barium sulphate, 1～2% molybdenum disulfide also have other compositions of 2～5%.
In the specific implementation process, described powder metallurgy inserts side has dovetail groove, can increase the cohesiveencess between macromolecule composite friction material and powder metallurgy inserts, be illustrated in figure 2 as the structural representation of the powder metallurgy inserts side that the embodiment of the invention provides: powder metallurgy inserts is designed to wedge shape, helps the compacting material; In order to guarantee the flowability of material in the pressing process, can design the powder metallurgy inserts width less than the steel backing width, an end aligns with steel backing, and another side leaves about 10mm space.
In addition, can also further optimize powder metallurgy inserts makes it be distribution straggly in the layout of steel backing, be illustrated in figure 3 as powder metallurgy inserts that the embodiment of the invention provides distribution schematic diagram at steel backing, powder metallurgy inserts is fixed under the brake shoe steel backing among Fig. 3, just can guarantee that by such distribution powder metallurgy inserts all contacts with whole metal tread.
Step 12: by cold moudling macromolecule composite friction material and described powder metallurgy inserts are pressed into integral body, constitute the rubbing surface of novel composite brake shoe.
In this step, the manufacturing process of cold moudling is specially: will be welded with the steel backing (as shown in Figure 3) of described powder metallurgy inserts and the brake shoe mould of described macromolecule composite friction material and pressurize on hydraulic press, and pressurize more than 120 seconds with moulding, discharging again.
Step 13: the composite brake shoe to cold moudling is cured, and after the friction piece intrados carried out grinding process, obtains to have the composite brake shoe of powder metallurgy inserts.
In this step, solidification technical process is specially: the brake shoe of cold moudling is incubated 1 hour in 100 ℃ of baking ovens, be warming up to 170 ℃ of insulations 4 hours then, be warming up to 180 ℃ of insulations 15 hours again, and after finishing, insulation opens described baking oven, keep blower normally to move, after below the air cooling to 80 ℃, come out of the stove again.
By the composite brake shoe that technique scheme is made, can significantly improve the heat-conducting property of composite brake shoe, reduce the heat fade of composite brake shoe, have stable frictional behaviour when guaranteeing the composite brake shoe braking; In braking process, can effectively conduct the frictional heat that wheel tread and brake shoe friction piece produce in braking process simultaneously, reduce fire damage, prevent that wheel heat crackle, heat crack, hot soarfing are from generation wheel.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claims.

Claims (7)

1. a making method that has the composite brake shoe of powder metallurgy inserts is characterized in that,
The powder metallurgy inserts that hardness, frictional behaviour and described macromolecule composite friction material are complementary is welded on the two ends of steel backing;
By cold moudling described macromolecule composite friction material and described powder metallurgy inserts are pressed into integral body, constitute the rubbing surface of composite brake shoe;
Described composite brake shoe to cold moudling is cured, and after the friction piece intrados carried out grinding process, obtains to have the composite brake shoe of powder metallurgy inserts.
2. the method for claim 1 is characterized in that, described macromolecule composite friction material forms by the banburying granulation according to the each component of following weight ratio, and the each component of described weight ratio is:
5～7% resol, 8～12% nitrile butadiene rubbers, 15～25% Steel Fibres, 6～12% magnesium oxide, 5～8% petroleum cokes, 20～35% mineral fibre, 2～5% graphite, 0.1～0.4% hexamethylenetetramine, 0.1～0.5% sulphur, 0.05～0.1% tetramethylthiuram disulfide, 0.5～2% carbon black and 1～1.5% potassic feldspar.
3. method as claimed in claim 2 is characterized in that, the process of described banburying granulation specifically comprises:
In the each component input kneading type banbury with described weight ratio, by banburying heating 3～5 minutes, and cleaning, banburying were regulated 3～5 minutes; Wherein, in described banburying processing procedure, temperature is controlled at 80～120 ℃, pressure control at 5～7Mpa;
Get rid of mixture, and after breaking process, obtaining described macromolecule composite friction material.
4. the method for claim 1 is characterized in that, described powder metallurgy inserts is divided by weight, and main component comprises:
60%～65% copper, 2%～5% iron, 2%～76% tin, 1～2% graphite, 2%～4% lead, 2～4% silica, 1～4% barium sulphate, 1～2% molybdenum disulfide.
5. the method for claim 1 is characterized in that, the side of described powder metallurgy inserts has dovetail groove, and described powder metallurgy inserts is designed to wedge shape;
The width of described powder metallurgy inserts is less than the width of described steel backing, wherein an end aligns with steel backing, the other end leaves the space of about 10mm, and described powder metallurgy inserts is evenly distributed on described steel backing, guarantees that described powder metallurgy inserts all contacts with whole metal tread.
6. the method for claim 1 is characterized in that, the process of described cold moudling specifically comprises:
Pressurize on hydraulic press being welded with the steel backing of described powder metallurgy inserts and the brake shoe mould of described macromolecule composite friction material, and pressurize more than 120 seconds with moulding.
7. the method for claim 1 is characterized in that, described solidification technical process specifically comprises:
The composite brake shoe of cold moudling is incubated 1 hour in 100 ℃ of baking ovens, be warming up to 170 ℃ of insulations 4 hours then, be warming up to 180 ℃ of insulations 15 hours again, and after insulation finishes, open described baking oven, keep blower normally to move, by below the air cooling to 80 ℃.
CN2010102274239A 2010-07-07 2010-07-07 Method for manufacturing composition brake shoe with powder metallurgy inserts Expired - Fee Related CN101907141B (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59231231A (en) * 1983-06-14 1984-12-25 Nippon Signal Co Ltd:The Composite brake-shoe for railway vehicle
CN1284461A (en) * 1999-08-06 2001-02-21 西屋气刹车公司 Brake-shoe with insert element combined with bottom plate
CN101381484A (en) * 2008-10-31 2009-03-11 北京瑞斯福科技有限公司 High friction coefficient synthetic materials and preparation method thereof
CN101391611A (en) * 2008-10-31 2009-03-25 北京瑞斯福科技有限公司 High friction composite brake shoe for railway freight car and manufacture method thereof
DE102007044744A1 (en) * 2007-09-18 2009-04-09 Becorit Gmbh Brake pad for rail vehicles
CN101586635A (en) * 2008-05-16 2009-11-25 Ncfa有限公司 Sintered material friction shoes for disc brakes of railway wheeled vehicles

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59231231A (en) * 1983-06-14 1984-12-25 Nippon Signal Co Ltd:The Composite brake-shoe for railway vehicle
CN1284461A (en) * 1999-08-06 2001-02-21 西屋气刹车公司 Brake-shoe with insert element combined with bottom plate
DE102007044744A1 (en) * 2007-09-18 2009-04-09 Becorit Gmbh Brake pad for rail vehicles
CN101586635A (en) * 2008-05-16 2009-11-25 Ncfa有限公司 Sintered material friction shoes for disc brakes of railway wheeled vehicles
CN101381484A (en) * 2008-10-31 2009-03-11 北京瑞斯福科技有限公司 High friction coefficient synthetic materials and preparation method thereof
CN101391611A (en) * 2008-10-31 2009-03-25 北京瑞斯福科技有限公司 High friction composite brake shoe for railway freight car and manufacture method thereof

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