SUBSTANCE: invention relates to friction elements containing a polymer composite layer to be operated in various friction assemblies in contact with a metal counter body. The proposed friction product comprises a friction element made in a polymer binder, dispersed fillers, fibrous reinforcing and metal-containing fillers. The friction element comprises additionally not over 2.5 % of a material made from powder high-molecular polyethylene as filler.
EFFECT: higher friction-wear properties due to higher friction and mechanical-effect.
The invention relates to the field of engineering, namely for friction products containing polymeric composite element and operated in different friction nodes in contact with the metal counterbody (pads disc and drum brakes, auto, railway transport and others).
Analogous to the claimed invention is a friction device, including a friction element made of polymer friction of the composite (see Shanin I.P., etc. Manufacture of asbestos technical products. L.: Chemistry, 1983, p.13-15). The essential features of analogue friction element made of polymer friction composite", coincide with the essential features of the claimed invention.
The disadvantage of analog is a high wear of the friction element, which is observed due to the formation of cracks and delamination of the friction element result is consistent destruction of the reinforcing filler.
The prototype of the claimed invention is a friction device, including a friction element made of a polymeric binder, particulate fillers, fibrous reinforcing and metal-containing fillers (see Guzeev CENTURIES and Reinforced savarirayan polymer composite materials for friction. - In the book "proceedings of the 3rd Between Narodnogo Symposium on tribology friction materials Yaro FRIES-97", Yaroslavl: 1997, str). The essential features of the prototype friction element comprising a friction element made of a polymeric binder, particulate fillers, fibrous reinforcing and metal-containing fillers" match the essential features of the claimed invention.
The disadvantages of the prototype are low abrasion resistance and resistance to impact mechanical impact and separation (cracking) of the product.
The challenge which seeks the invention is to improve the friction properties of the frictional properties of the product due to the high resistance to abrasion and resistance to shock mechanical stress and cracking of the product.
To achieve the technical result in friction product, comprising a friction element made of a polymeric binder, particulate fillers, fibrous reinforcing and metal-containing fillers, as well as filler optionally contain material that is made from high molecular weight polyethylene in powder form.
The essential features of the claimed invention "of the friction element also as filler further comprises a material made of high molecular weight polyethylene in powder form are distinguishing the signs of the prototype.
Friction product contains a friction element made of polymeric friction composite containing polymer binder based resins and rubbers, disperse fillers (organic, mineral powders, and others), fibrous reinforcing fillers (mineral, organic, and others), metal-containing filler (bronze, copper, brass and other), including contains a filler material made of high molecular weight polyethylene in powder form, which provides improved friction properties of the frictional properties of the product due to the high resistance to abrasion, resistance to mechanical shock impacts and prevents cracking of the product.
A specific example of the inventive friction products is a brake lining for trucks, and a friction element which is made of polymer friction composite containing filler material, made of high molecular weight polyethylene in powder form. The polymer composite includes a polymer binder 17%, disperse fillers 41%, fibre reinforcement and metal-containing fillers 39.5% and the filler material is made of high molecular weight polyethylene is 2.5%.
To produce the inventive product is well-known methods, for example as follows : the m: mixing a binder with other fillers in mixers RSVD-140-30, then carried out molding in the mold, heat treatment and, if necessary, mechanical processing.
Friction device, including a friction element made of a polymeric binder, particulate fillers, fibrous reinforcing and metal-containing fillers, characterized in that the friction element also as filler further comprises not more than 2.5% of the material, made of high molecular weight polyethylene in powder form.
FIELD: engineering industry.
SUBSTANCE: invention refers to engineering industry, and namely to manufacturing methods of friction items with firm inserts, which are meant for various transport types. Method is realised by hot moulding of shoe from polymer compound in a moulding tool under pressure at simultaneous alignment thereof with metal frame and firm inserts. Hot moulding is carried out in moulding tool with grooves located in a punch that forms the shoe working surface in firm insert location areas. Process projections are formed from polymer friction material on shoe working surface in those zones; then, shoe working surface is machined and process projections are removed, thus providing arrangement of working surfaces of firm inserts and polymer friction material in one plane. Moulding tool used for shoe manufacturing consists of a matrix and upper and lower punches. Punch forming the shoe working surface is equipped with grooves meant for each of the inserts arranged in location areas of firm insert working surfaces. Each groove is bigger than the appropriate insert.
EFFECT: providing the possibility of manufacturing railroad transport means brake shoe and locating working surfaces of firm inserts and working surface of friction material of shoe friction element in one and the same plane, providing efficient operation from the very beginning of brake shoe operation, and minimising the number of expensive friction material waste appearing during machining of shoe working surface.
2 cl, 3 dwg, 4 ex
SUBSTANCE: braking block comprises metal carcass, composite material friction element and two solid inserts arranged symmetrically relative to the block horizontal axis and overlapping its friction part over the width. The said metal carcass represents a wire carcass representing two closed frames press-fitted into the block rear part friction material and perforated tin press-fitted into the block rear part composite friction material. Inner parts of the said frames are partially interoverlapped and bent outwards from the block rear part to form an ear designed to pass the cotter. Rear nonoperating part of every cotter has consoles arranged on each side of the aforesaid inserts all along their length. One of the said consoles is bent towards the block rear surface and arranged in the central boss, the other one being located between the central and auxiliary bosses. Each of the inserts is fitted into one of the wire carcass frames and jammed therein. The inserts, along with the carcass, are pressed in the composite friction material so that the insert console rear surfaces are located in one plate with the perforated tin of the block rear side.
EFFECT: higher durability and safety, longer service life, sable braking capacity and wheel surface recovery in braking.
3 cl, 3 dwg
FIELD: machine building.
SUBSTANCE: invention relates to machine building, particularly, to components used for separation of stacked porous plates in production process. Proposed circular gasket has opposed first and second surfaces with multiple holes. The said gasket is made of metal wire screen and partially form multiple radial gas-passages, each passing between the gasket inner and outer radial sides to inter-joint them. Method of preparing circular carbon fiber blanks for chemical filtration in vapor phase consists in stacking the aforesaid carbon fiber blanks. Between every two circular blanks, a circular metal screen cushion is laid so as to make stacked circular blanks and circular gaskets form interfaces of internal space inside a stack. Every circular gasket has first and second opposed surfaces and is made so as to form multiple radial gas passages communicating the stack inner space with outside space.
EFFECT: updating production process.
20 cl, 11 dwg
FIELD: machine building.
SUBSTANCE: invention relates to machine building, particularly, to components used for separation of stacked porous plates in production process. Circular gasket is made of carbon material whereon an adhesive coat layer is applied and incorporates opposed first and second surfaces. Note that at least one of the said surfaces has multiple radial channels each passing between the gasket inner and outer radial sides to inter-joint them. Method of preparing circular carbon fiber blanks for chemical filtration in vapor phase consists in stacking the aforesaid carbon fiber blanks. Between every two circular blanks, a circular metal screen cushion is laid so as to make stacked circular blanks and circular gaskets form interfaces of internal space inside a stack. Every aforesaid circular gasket comprises adhesive coat layer applied thereon to prevent sticking of circular carbon blanks. Method of producing one-piece circular carbon-material gasket consists in forming one-piece circular carbon-material gasket with opposed first and second surfaces and radial channel and applying adhesive coat layer on the said circular gasket.
EFFECT: updating production process.
22 cl, 11 dwg
SUBSTANCE: invention refers to railway transport, namely to brake blocks of railway vehicles. Brake block contains composite friction element, metal frame made of steel strip and solid insert welded to it, wire frame, central boss with orifice for splint and two side bosses. Metal frame of steel strip is less in width than wire frame, it is radiussed over brake block rear surface and pressed in brake block rear surface from both sides of solid insert between side bosses and central boss. Wire framework is essentially two closed up frames around block periphery pressed into composite friction element in the rear part of brake block. Inner parts of two closed up frames overlap each other are folded outside rear part of brake block forming an eye for a splint. Side bosses are made of composite friction material. Solid insert has slot open from the side of its rear surface is enclosed in wire frame and pressed in central boss so that its rear surface is in same plane with central boss rear surface. Enhancement of strength of brake block construction and tool-life gain are reached, as well as spoilage reduction in their manufacturing.
EFFECT: enhancement of strength of brake block construction and tool-life gain are reached, as well as spoilage reduction in their manufacturing.
SUBSTANCE: invention refers to railway transport, namely to brake blocks of railway vehicles. Brake block contains composite friction element, wire framework, solid insert located in central part of block and pressed into composite friction element. Wire framework is essentially two closed up frames around block periphery pressed into composite friction element in the rear part of brake block. Inner parts of two closed up frames overlap each other are folded outside rear part of brake block forming an eye for a splint. The block contains in its rear part wire-mesh or perforated metal sheet pressed into composite friction element. Insert has slot in its upper idle part pressed by composite friction element with orifice for splint and cantilevers symmetrically located over insert length from each side. Upper idle part of insert is put in wire frame and jammed in it. Enhancement of strength, reliability of brake block construction, tool-life gain are reached.
EFFECT: enhancement of strength, reliability of brake block construction, tool-life gain are reached.
4 cl, 3 dwg
SUBSTANCE: friction plate has two holes and is made in a polymer anti-friction composite material reinforced by a thread or threads. The said polymer anti-friction composite material contains a smaller number of reinforcing threads compared to the other parts of the friction plate.
EFFECT: improved strength and operating properties allowed by reducing fracturing nearby holes.
SUBSTANCE: the invention relates to the area of mechanical engineering, in particular, to friction pads intended for operation in lubricated assemblies. The friction pad is designed as part of a cylindrical shell, on the internal surface of which rectangular grooves are made. The grooves located longitudinally to the pad length have the same width and depth. The grooves transversal to the pad length, have width increasing with the groove depth. This provides stability of friction characteristics of the pad and decreases friction pair wear due to providing of more favourable conditions for penetration of the lubricating oil to the friction contact area, more efficient cooling of the friction elements, and better cleaning of the friction contact area from the wear products.
EFFECT: increased stability of friction characteristics of pad and decreased friction pair wear.
FIELD: railway transport; brake shoes.
SUBSTANCE: proposed brake shoe contains metal skeleton, polymeric composite friction member, one or several abrasive friction inserts and support layer placed between polymeric composite friction member and metal skeleton. Support layer is placed also between polymeric composite friction member and abrasive friction insert (inserts), or between polymeric composite friction member and part of surface of abrasive friction insert (inserts). Invention is aimed at improving operating characteristics of shoe owing to increased strength of connection of insert (inserts) and polymeric composite friction member by additional locking and reduced possibility of burning out of polymeric composite friction member in zone of insert (inserts) owing to provision of heat insulation of member relative to insert.
EFFECT: increased service life of shoe.
FIELD: railway transport; vehicle brake systems.
SUBSTANCE: proposed brake shoe contains metal skeleton and polymeric composite friction member with dispersed abrasive particles. Introduced additionally into composite member are porous abrasive particles, pore sizes in particles are commensurable with sizes of dispersed abrasive particles.
EFFECT: improved operating characteristics of shoe owing to increased holding of microabrasive particles in shoe body in process of operation provided by their additional fixing.
FIELD: mechanic engineering.
SUBSTANCE: invention is related to production of composite polymer materials and tools designed to grind solid surfaces of metals and alloys. This material uses ultra-high molecular polyethylene as a basis and diamond powder with grain effect 40-120 μm.
EFFECT: improvement of abrasive tools durability and serviceability owing to high wear resistance combined with stable friction factor.
1 tbl, 2 ex
FIELD: technological processes.
SUBSTANCE: invention is related to the field of materials science, in particular, to polymer composite materials (PCM) based on polytetrafluorinethylene (PTFE) and may be used for making parts of metal polymer friction units of different equipment. Technical result is achieved by using energy of ultrasonic vibrations with frequency of 20±3 KHz and vibrations amplitude within the range of 8-12 microns during pressing of composite mixture. At that vibrations continuously affect the pressing puncheon during 2÷3 minutes. Preliminarily mixture powders are mixed in the mixer with knives rotation frequency of at least 2800 min-1. Cold pressing of composition is made in closed mould under the pressure of 50±5 MPa. Pressed stock is heated in the furnace up to the temperature of 360±5°C with the rate of 1.5-2.0 degrees/min. Then it is soaked at this temperature for 8÷9 min per 1 mm of item wall thickness and cooled down to 327°C with the rate of 0.3-0.4 degrees/min and then from 327°C down to room temperature together with the furnace.
EFFECT: improves mechanical and tribotechnical properties of composite material and increases economy of technological process of items production.
2 cl, 2 tbl
FIELD: polymer materials.
SUBSTANCE: invention relates to vehicles and lifting-and-shifting machines as well as to allied technical fields wherein friction phenomenon is used to achieve a positive effect. Composition according to invention contains, wt %: binder based on rubbers SKI-3 and SKD 11.5-13.0, wollastonite 50.0-54.5, barite 23.5-24.5, graphite 3.0-3.7, carbon black 1.5-1.9, sulfuric curing system: sulfur 3.5-4.5, captax 0.2-0.5, thiuram 1.2-1.7, zinc oxide 0.3-0.7, and, above 100%, modifier selected from group: stearic acid, oleic acid, stearic acid/oleic acid mixture at ratio between 40:60 and 0.02:0.5 or above mixed modifier with terephthalic acid in total amount 3 wt parts or stearic acid in amount 0.02-0.5 wt parts per 100 wt parts rubber mixture.
EFFECT: improved physicochemical properties and reduced rheological characteristics of composition.
2 tbl, 2 ex
FIELD: polymer materials.
SUBSTANCE: invention relates to a method for preparing frictional polymer materials for use in manufacture of brake blocks of railway cars, lifting cranes, clutch plates, electrical appliances, etc. Method envisages rolling of 100 wt parts binder based on butadiene or butadiene/nitrile rubbers with epoxide component including resins, 5-20 wt parts curing agents (alkylphenol-formaldehyde resins), and filling mixture: 100-400 wt parts powder filler and 50-200 wt parts fibrous filler, said binder being, in particular, rubber (A) preliminarily processed on rolls with interaction product of epoxide dian resin having molecular weight 400 to 1200 with methacrylic acid, reacting with epoxide groups and used in amount 0.3 to 0.8 based on its stoichiometrically required amount, in presence of catalyst: methylimidazole used in amount 0.05 to 1.0 wt parts per 100 wt parts reactants (B) at A/B weight ratio between 96:4 and 60:40.
EFFECT: increased heat resistance, strength, and service time of frictional material, increased durability of metallic object being in contact with it due to elimination of sulfur compounds in material.
FIELD: processes and equipment for making frictional articles designed for operating in different mechanisms, particularly in braking units and couplings.
SUBSTANCE: method comprises steps of shaping article from material with polymeric binder and fillers; at side of working surface of article performing heat treatment at temperature exceeding maximum temperature of article operation by 20 -40 % for 10 - 90 seconds. Initial surface layer formed on friction article features stable friction factor.
EFFECT: enhanced efficiency of method, improved friction factor of article.
2 tbl, 4 ex
FIELD: friction materials.
SUBSTANCE: invention relates to friction-destination asbestos-free polymer compositions and can be used in mechanical engineering, in particular in manufacturing of brake blocks for rail-way rolling-stock. Composition contains rubber, sulfur-based vulcanization mix, fibrous filler (polyoxadiazole fiber/mineral wool mixture), metal-containing filler (broken cast iron pellets), friction modifier (mixture of crystalline graphite, cryptocrystalline graphite, and carbon black), inorganic modifier (barite concentrate/alumina/zeolite mixture).
EFFECT: stabilized coefficient of friction, reduced release of harmful substances (in particular, phenol) during manufacturing procedure, and reduced cost of produce.
2 dwg, 3 tbl
FIELD: chemical industry; production of the abrasive-polymeric composition for manufacture of the polishing tools.
SUBSTANCE: the invention is pertaining to the field of chemical industry, in particular, to production of the abrasive-polymeric composition used for manufacture of the of the elastic abrasive tool designed for treatment of the products of the complex profile, including the large size products. The composition contains the following ratio of the components (in mass %): 64.0-72.0 - silicon carbide or electrocorundum, 16.0-18.0 - fine chalk, 7.8-15.6 - oligomeric carboxylated divinyl or divinylnitrile caoutchouc, 1.9-3.8 - epoxy dian resins ED-20, 0.2-0.4 zincoxides, 0.1-0.2 - thiuram D. The invention ensure the increased strength of the manufactured tools, the improved their operational properties and the reduced their production net cost.
EFFECT: the invention ensures the increased strength of the manufactured tools, the improved their operational properties and the reduced their production net cost.
1 tbl, 8 ex
FIELD: chemical industry; metallurgy; methods of manufacture of the frictional articles.
SUBSTANCE: the invention is pertaining to invention concerns to chemical industry and metallurgy industry and may be used at manufacture of the articles of the abrasive and frictional assignment. The method of manufacture of the frictional article includes the stapling of the carbonic fiber, its mechanical intermixing by the turbulent stream of the conveying agent with the peck powder, the subsequent settling of the mixture on the filtration component by action of the stream of the conveying agent with formation of the squeezer-package having the structure with the various orientation of the fibers filaments all over the volume, molding of the article billet by volumetric compaction of the squeezer-package at the temperature below the temperature of the peck softening, molding of the article by pressing of the billet with the simultaneous action of the pressure and heat at the temperature exceeding the peck softening temperatures, and the stabilizing thermal treatment of the article. Before the stapling action the initial carbonic fiber made in the form of the continuous harnesses are dressed by the finishing coke-forming polymeric compound, shaped into the leas made out of the continuous harnesses and graphitized at the temperature of 2000-3050°С at the tight packing of the leas. The invention ensures prevention of the disruptions of the graphite fibers at the technological conversions of production of the brake plates.
EFFECT: invention ensures prevention of the disruptions of the graphite fibers at the technological conversions of production of the brake plates.
3 cl, tbl, 3 ex
FIELD: chemical industry; production of the abrasive-polymeric composition used for manufacture of the porous polishing tools.
SUBSTANCE: the invention is pertaining to the polymeric compositions for manufacture of the elastic abrasive tools for the surface finish machining of the complex shape articles, including the large-size articles. The abrasive-polymeric composition consists of the silicon carbide or the electrocorundum, the finely-dispersive chalk, the liquid carboxylaled divinyl or divinyl nitrile rubber, epoxidian resin ED-20, zinc oxide, azoisobutyronitrile, the blockcopolymer of polyorganosiloxane and polyoxy alkylene. The technical result of the invention is the decreased net cost of production of the grinding tool made out of the abrasive-polymeric composition, the increased its strength properties at conservation at the high level of its technological and operational properties.
EFFECT: the invention ensures the decreased net cost of production of the grinding tool made out of the abrasive-polymeric composition, the increased its strength properties at conservation at the high level of its technological and operational properties.
3 cl, 1 tbl
FIELD: polymer materials.
SUBSTANCE: friction material composition relates to the area of creating novel composites with polymer matrix. Composition is destined for use in oil-cooled arrangements of mobile machines and process equipment. Composition contains synthetic rubber, curing group, phenol-formaldehyde resin, layered silicate, polysulfone fiber, and dispersed fillers in the form of oxides and sulfates of metals selected from barium, zinc, titanium, copper, iron, magnesium, and calcium.
EFFECT: increased wear resistance and coefficient of friction of friction material in an oil medium, and stabilized coefficient of friction in transition processes.
FIELD: special compositions.
SUBSTANCE: invention relates to a method for preparing composition compounds based on phenolformaldehyde resins, in particular, friction materials for members of breaking device constructions. The composition for preparing friction material comprises the following components, wt.-%: butadiene nitrile rubber, 1-7; phenolformaldehyde resin, 11-25; copper powder, 7-9; barite, 17-19; carbon fiber, 11-13; graphite, 6-10; magnesium oxide, 1-3; diabase powder, 2-4, and basalt fiber, the balance. Invention provides enhancing friction properties of material resulting to optimization of effect the hydrogen wearing an reducing value of the material wear in its working in corrosive hydrogen-containing media.
EFFECT: improved and valuable properties of composition.