57results about How to "Improve friction and wear" patented technology

The invention discloses a water lubrication rubber alloy bearing, which comprises a water lubrication rubber alloy bushing and a bearing outer ring. The water lubrication rubber alloy bushing is bonded on the inner circumference of the bearing outer ring through die stamping and vulcanizing, the corresponding coincidence relation is adopted for the radial thickness m of the water lubrication rubber alloy bushing according to the difference of the internal diameter d of the water lubrication rubber alloy bushing. The affect of the radial thickness of the water lubrication rubber inner liner to the bearing capacity and the shock resistant capability of the bearing is comprehensively considered in the water lubrication rubber alloy bearing, the corresponding thickness of the water lubrication rubber inner liner is adopted according to bearings with different specifications, the bearing capacity of the bearing is obviously enhanced, the properties of surface deformation compatibility and elastic fluid dynamic pressure lubrication and the good silt, sand and impurities drainage capacity are strengthened, the service life of the water lubrication rubber alloy bearing is more than three times the similar bearing, the water lubrication rubber alloy bearing has the advantages of vibration damping, noise reduction, abrasion resistance, reliability, high efficiency, energy conservation and environmental friendliness and can be widely applied to the fields of the engineering equipments of machinery, marine vessel, petroleum, chemical industry, mine, water conservancy, agriculture and national defense.

The invention relates to a high-carbon gray cast iron automobile brake disk and a production method thereof. The high-carbon gray cast iron automobile brake disk comprises the following chemical components in percentage by weight: 3.7-3.8% of C, 0.5-0.8% of Mn, 0.3-0.5% of Cu, 0.1-0.2% of Cr, 0.2-0.4% of Mo, 1.6-2.0% of Si, 0.1-0.2% of N, 0.01-0.12% of P, 0.05-0.12% of S and the balance of Fe. The brake disk provided by the invention has the outstanding characteristics of small brake temperature rise, abrasion resistance, favorable heat fatigue resistance effect and the like; the performance of an automobile brake system can be obviously improved, and the service life can be obviously prolonged; and meanwhile, the potential safety hazard caused by ineffective brake due to high temperature can be effectively eliminated. Thus, the high-carbon gray cast iron automobile brake disk has high economic value.

The invention discloses a multifunctional friction-wear test device and method for simulating a space environment. The multifunctional friction-wear test device for simulating the space environment comprises a load mechanism, a vacuum box, a friction force detection mechanism, an upper sample clamp, a lower sample mounting base, an ultraviolet generating device for irradiating ultraviolet for samples, a refrigerating system for decreasing temperature inside the vacuum box, a heating system for increasing the temperature inside the vacuum box and a lower sample driving system for driving the lower sample mounting base to drive a lower sample to rotate relative to an upper sample. The disadvantage that the friction-wear test of a space is comprehensively influenced by multiple factors of thespace environment in the prior art is compensated, the friction-wear condition of the material under the space environment is preferably explored, and specifically various environments, such as highvacuum, alternating temperature, heat radiation, and complex movement working conditions, such as alternating load, high and low speed and interrupt operation, of the mechanism, in the space environment can be simulated.

The invention discloses a high-wear-resistance high-impact-resistance polyamide-6-based nano composite material and a preparation method thereof. The friction material comprises the following components in parts by weight: 55-75 parts of polyamide 6, 3-5 parts of modified nano titanium dioxide, 10-15 parts of composite solid lubricant, 3-8 parts of compatibilizer, 10-20 parts of flame retardant, 0.5-2 parts of antistatic agent, 0.05-0.5 part of antiaging agent and 0-1 part of surface modifier. The preparation method comprises the following steps: uniformly mixing all the materials according to parts by mass, and carrying out a fusion process to obtain the high-wear-resistance high-impact-resistance polyamide-6-based nano composite material. The friction material has the advantages of simple manufacturing technique, high wear resistance, high impact resistance, flame retardancy, static resistance, high/low temperature resistance, corrosion resistance, aging resistance, low cost and the like, overcomes the defect that the enhancement of a certain property of the material influences other physical property indexes in the prior art, and implements the high properties of the material.

The invention relates to a four-point contact ball bearing which comprises an outer ring, two separated inner rings, rolling bodies and a retainer, wherein pockets are uniformly distributed along the circumference of the retainer; the rolling bodies are respectively installed in pockets and arranged between the outer ring and the two inner rings; a fore shaft is formed at the inner side of each pocket on the retainer; each fore shaft comprises two arc-shaped merrowes which symmetrically expand to the central axis of the corresponding pocket; the total arc length of the two arc-shaped merrowesis two fifth or one third of the line contact arc length of the rolling bodies; and the arc-shaped merrowes and the hole walls of the pockets are in inclined plane transition. By the adoption of the invention, the assembly process can be simplified; the assembly efficiency and accuracy of the bearing are improved; the frictional resistance when the bearing operates is reduced; and the service life of the bearing is prolonged.

The invention relates to a double-cylinder rotary compressor. The rotary compressor comprises an outer air cylinder, an ellipse rotor, and an inner air cylinder which are concentrically installed, wherein an inner short shaft of the ellipse rotor is equal to the outer diameter of the inner air cylinder, and an outer long shaft of the ellipse rotor is equal to the inner diameter of the outer air cylinder; the external surface of the ellipse rotor and the inner wall surface of the outer air cylinder are tangent at any kinetic instant, the internal surface of the ellipse rotor and the outer side wall of the inner air cylinder are tangent, the inner air cylinder and the outer air cylinder are respectively provided with two pairs of slip sheets; the inner air cylinder is provided with two pairs of air inlet cavities and exhaust cavities; crescent volume is divided into two pairs of air inlet (liquid) cavities and compressing, exhaust (liquid) cavities by the inner air cylinder and the outer air cylinder so as to form four pairs of corresponding working volumes; and the inner air cylinder and the outer air cylinder are respectively provided with four pairs of air inlet ports and exhaust (liquid) ports. The double-cylinder rotary compressor provided by the invention has the advantages of high efficiency, no vibration, small volume, uniform stressing of a main shaft, small gas pulsation, simple structure, is stable in operation, and eliminates unbalanced force caused by rotation; and the double-cylinder rotary compressor can be used in different gas compressors, fluid pumps and vacuum pumps.

The invention relates to a preparation method of a chopped carbon fiber reinforced Cf/SiC composite material. The method comprises the following steps: mixing chopped carbon fibers, silicon carbide powder, a dispersant, a binder and water to obtain slurry; performing slip casting on the slurry to obtain a green body; performing heat treatment on the green body under vacuum conditions at 800-1200 DEG C for 0.5-2 h to obtain a preform; and embedding the preform by using silicon powder, and performing sintering under vacuum conditions at 1450-1700 DEG C for 0.5-2 h to obtain the chopped carbon fiber reinforced silicon carbide based composite material.

The processing steps are: a B4C powder with particle size 0.1 mum-20 mum, WC powder with particle size 0.1 mum-20 mum, conductex ratio of B4C:WC: conductex is (4-6):(7-9):(0-120), they are mixed by regular technology; b. mixed material is put in graphite model; c. the model is put into high vacuum heat-pressing furnace to be fired in vacuum or protection gas, firing temp. is 1600-2200 deg.C, pressure acting on graphite model is 15-45 Mpa, temp. -keeping time is 0.5-3 hours. The C/W2B5 compound material produced by this invention has compacting degree is greater than or equal to 96 percent, resistivity is less than or equal to 2.0 mu omega.m, room-temp. anti-bending strength is greater than or equal to 350 MPa, room-temp. breaking toughness is greater than or equal to 5 MPa.m1/2.

A ceramics sliding member for use in ultrapure water or pure water of the present invention is made of a non-continuous-pore SiC sintered body. The non-continuous-pore SiC sintered body includes β-SiC at a ratio of 20% by weight or more thereto and has an average crystal structure whose aspect ratio is 2 or greater.

A ceramics sliding member for use in ultrapure water or pure water of the present invention is made of an SiC sintered body. The SiC sintered body includes β-SiC at a ratio of 20% or more thereto and has an average crystal structure whose aspect ratio is 2 or greater.

The invention discloses a laser cladding coating method for iron-based titanium carbide. The method is characterized by comprising the following steps: 1, selecting 45# steel as a cladding substrate, polishing to be smooth and clean by 600-mesh sand paper, thoroughly removing oil stains and rust on the surface of the substrate by an acetone solution; 2, drying nickel-based powder in a drying machine at 120 DEG C for 60 minutes; 3, arranging glass fibers on the substrate, and prearranging nickel-based powder on the surface of the 45# steel substrate, wherein the powder is 1-5 mm in thickness; 4, cladding by a high-power semiconductor laser device, wherein the laser power is 3,000 W. The selected and used optical spot is 2-8 mm in width, the focal length is 370 mm, the scanning speed is 8 mm/s or 16 mm/s, and argon gas is adopted as protection gas.

The invention discloses a preparation method of multilayer nano-composite-class diamond films on the surface of a camshaft. Due to the adoption of a high-frequency and high-power impulse magnetron sputtering technology, the multilayer nano-composite-class diamond films are deposited on the surface of the camshaft. The thicknesses of the composite films are 0.2-0.5 micrometer, the thickness of a bearing layer of the composite films is 1-3 micrometers, and the surface thickness of the composite films is 1-3 micrometers. The surface binding force of the composite film camshaft is up to 60N.

The invention discloses a method for treating M50 bearing steel, strengthened M50 bearing steel and a bearing. The method comprises the steps that firstly, a low-energy gas ion beam is used for cleaning the M50 bearing steel; secondly, a high-energy ion beam is adopted for injecting a first rare earth element into the surface of the M50 bearing steel obtained in the first step; thirdly, the high-energy ion beam is adopted for injecting at least one of the carbon element and the nitrogen element into the surface of the M50 bearing steel obtained in the second step; fourthly, the high-energy ion beam is adopted for injecting a second rare earth element into the surface of the M50 bearing steel obtained in the third step; fifthly, low-energy large beam ions are adopted for conducting bombardment treatment on the M50 bearing steel obtained in the fourth step; sixthly, the high-energy ion beam is adopted for alternately injecting metal ions and gas ions in the surface of the M50 bearing steel obtained in the fifth step; and seventhly, under gas protection, cooling treatment is conducted on the M50 bearing steel obtained in the sixth step, and the strengthened M50 bearing steel is obtained. By means of the method, friction and abrasion resistance, fatigue resistance, corrosion resistance and other comprehensive performance of an M50 bearing steel material can be greatly improved.

The invention discloses an ion beam and cryogenic composite strengthening method for M50 bearing steel. The cryogenic composite strengthening method comprises the following steps that (1), vacuum heat treatment is conducted on the bearing steel through low-energy large-beam gas ions; (2), cryogenic strengthening processing is conducted on the bearing steel obtained in the first step through liquid nitrogen; (3), the bearing steel processed in the second step is cleaned through gas ion beams; and (4), by the adoption of an ion implantation method, gas ions and metal ions are alternately injected into the surface of the bearing steel processed in the third step by the adoption of an ion injection method till the bearing steel is strengthened. According to the method, the ion injection layer depth and the sub deep surface layer strengthening depth of the M50 bearing steel material are increased greatly by the adoption of thermal processing and cold processing in combination with the ion injection strengthening technology, the friction wear performance and fatigue resistance performance of the M50 bearing steel are improved, and the strong and tough integrated material modified layer is formed.

The invention discloses an auxiliary seal life verification testing machine for a nuclear main pump shaft seal. The machine comprises a vibration main unit which includes a connecting disc, an actuator, a force measurement sensor, a double-groove static ring seat and an insertion part, wherein the actuator and the force measurement sensor are installed on the connecting disc, the double-groove static ring seat is located above the force measurement sensor, and the insertion part is installed on an output shaft of the actuator, and the double-groove static ring seat is provided with three ringgrooves. A middle annular groove is connected with a circulating water inlet pipe and a circulating water outlet pipe, the upper annular groove and the lower annular groove accommodate two groups of groove-shaped seals of a contrast test, each groove-shaped seal comprises an O ring and an O ring supporting ring, the O ring supporting rings abut against the outer cylindrical surface of the insertion part under the action of circulating water pressure, and the inserting part is driven by the actuator to reciprocate and rub with the two O ring supporting rings. The force measurement sensor measures a total friction force. An actuator oil source is used for providing a hydraulic medium for the reciprocating motion of the actuator; a water pressurizing and circulating system is used for continuously supplying high-pressure deionized water to the double-groove static ring seat; and a monitoring system is used for detecting vibration related parameters and controlling normal operation of theequipment.

The invention discloses a preparation method of a modified ultra-high molecular weight polyethylene composite, and belongs to the field of high polymer materials. The composite comprises 80-120 partsof ultra-high molecular weight polyethylene, 7-12 parts of nanosilicon dioxide, 5-10 parts of glass microsphere, and 0.1-0.8 part of silane coupling agent. The nanosilicon dioxide and the glass microsphere are added into the ultra-high molecular weight polyethylene, the nanosilicon dioxide particle and the glass microsphere blocks the extension and the plastic deformation of a furrow, and the embedding and the cutting of an abrasive particle are stopped. Proper amount of nanosilicon dioxide particle is filled to improve the frictional wear and the erosion resistance of the ultra-high molecularweight polyethylene, and the glass microsphere improves the thermal stability and the anti-friction croop property of the ultra-high molecular weight polyethylene.

A secondary envelope type rotary gas compressor features that the corners of rotor is changed into arc recess crossed with the contour of rotor, the adjacent rotor contour is modified for smooth linking between the modified contour and rotor contour, and a cylinder is installed in each arc recess communicated with the lubricating system of bearing, resulting in rolling contact between rotor and stator. Its advantages include good size compensation, high antiwear and sealing performance and long service life.

Described herein are fluororesin compositions of melt processible fluororesin and wholly aromatic polyamide fibers. The wholly aromatic polyamide fibers have an average fiber diameter of 10-20 μm and an average fiber length of 100-1,000 μm. The compositions are melt processible and can be melt molded into sliding members having low wear when used with sliding counterparts made of metals such as aluminum, copper, zinc or nickel.