457results about How to "Reduce frictional heat" patented technology

The invention relates to a method and a device for controlling a residual stress on a stir friction welding surface. According to the method, an insulation box capable of moving along a stirring head is adopted to insulate the weld joint and parent metal after welding, and then furnace cooling is performed so as to reduce the residual stress on the stir friction welding surface. The device mainly comprises a sucking-disc type fixture, the insulation box and control equipment, wherein the insulation material mainly comprises fire bricks, asbestos and steel plates. During welding, the insulation box moves along the stirring head and insulates the welded workpiece continuously; and after the welding, the whole workpiece enters the insulation box to be insulated and is cooled with the furnace after being insulated for a certain time so as to control the residual stress on the welding surface and the deformation, wherein the insulating temperature is the critical temperature of the heat treatment of the materials. The device realizes full automation in the whole welding process and avoids the reduction in the welding quality due to a human factor. The method and the device have the advantages of simple device, convenient operation, high technical economic benefit, and high welding quality of the stir friction welding.

The invention discloses a metal-based self-lubricating composite coating; the metal-based self-lubricating composite coating comprises a thermal barrier transition layer, a self-lubricating interlayer and a self-lubricating working layer which are sequentially coated from the surface of base metal; the thermal barrier transition layer comprises 83-88% of a mixture P, 10-15% of nano Cr powder and 2% of Y2O3; the mixture P comprises 45-50% of zirconium oxide, 12-20% of aluminium oxide, 2-4% of palladium oxide and 26-41% of Ni powder; the self-lubricating interlayer comprises 91-98% of NiCrSiB-401 and 2-9% of carbon fibre; and the self-lubricating working layer comprises 2-8% of Cr, 0.2-5% of Y, 0.3-5% of Ce, 0.2-6% of Ta and the balance of C. The metal-based self-lubricating composite coating disclosed by the invention has the advantages of being high in thermal barrier property, self-lubricating property, friction reduction and noise reduction properties and the like.

This invention concerns a system for cooling components in a gas turbine engine, the gas turbine engine including a compressor for driving a primary gas flow to a combustor and a turbine arranged to be driven by combustion gases from the combustor, wherein the system includes: an annular cooling flow passage arranged for fluid communication between the compressor and the turbine, the flow passage having a first inlet arranged to receive gas from the primary gas flow downstream of compressor, and a second inlet located upstream of the first inlet, wherein the annular cooling flow passage has at least one internal wall for guiding airflow from the first inlet towards the airflow from the second inlet, the airflow from the first and second inlets coalesce within the annular flow passage prior to passing along the passage in a direction from the compressor to the turbine.

A wear-proof mechanical end face sealing structure comprises mechanical sealing movable and fixed rings, on the end faces of which are machined microlugs arranged a girdle according to the centre of the end face. Beside the girdle is disposed a ring sealing dam with a smooth surface symmetrically about the centre of the end face and there is at least one ring sealing dam on the end face. The parametric range of the microlug structure is that, the aspect ratio or the breadth depth ratio is 0.5~30, the height is 2~500 mu m, the area density is 0.1~0.7 and the distance between the section axile wires of the adjacent microlugs is 0.05~1.0 mm.

The invention discloses a single-roller bit with PDC (polycrystalline diamond compact) composite plates, which is characterized in that diamond PDC plates are brazed on a toothed column and then are embedded on a roller, a bearing is sealed with a metal ring in a combined manner by two O-shaped rings, high-speed rotating radial combined sealing of a roller groove diameter and a ring outer diameter and high-speed rotating radial combined sealing of a ring inner diameter and a shaft groove diameter are respectively realized alternatively by the aid of the two O-shaped rings, the sealing life of each single O-shaped ring is prolonged, and bearing abrasion speed is reduced by the aid of double thrust cushions; gauge protection ability and work stability of the bit are increased by two-stage gauge protection; and high-speed slurry sprayed out via a hydraulic jetting system cleans rocks of a shaft bottom, a surface of the roller and PDC teeth and carries rock scraps at the shaft bottom to return upwards, the multiple groups of gauge protection PDC composite plates are arranged reasonably, work indexes of the bit are greatly increased under the condition of ultra-high rotation speed, well drilling cost is reduced, the rotation speed of the bit and torque of the PDC plates are reduced as compared with a PDC bit, damage to the PDC plates due to rotation is reduced, and work performances of the single-roller bit can be greatly improved.

The invention discloses a thermal deformation suppression middle type high-speed crown block gantry five-axis machining center. A workbench is directly cast on a base; a left bridge and a right bridge are installed on the two sides of the base; linear guide rails are installed on the left bridge and the right bridge correspondingly; a cross beam is installed on the left bridge and the right bridge through X-axis sliding blocks on the two sides; the middle of the cross beam is hollowed-out; four guide rails are arranged on the upper side and the lower side of the cross beam; and a left sliding base and a right sliding base are installed in the middle of the cross beam through the sliding blocks. A left ram and a right ram are connected into a whole through a Y-axis sliding block and a connection board, four linear guide rails are arranged on the rams, and the rams are installed in the middle of the left sliding base and the right sliding base through Z-axis sliding blocks. The middle type design of the movement components in the thermal deformation suppression middle type high-speed crown block gantry five-axis machining center effectively conduct temperature rise generated by movement, so that structural deformation is uniform and influence of thermal deformation on the precision machining of products is reduced. The thermal deformation suppression middle type high-speed crown block gantry five-axis machining center is stable in operation and performance and suitable for precision machining in the automotive die field.

The invention discloses a high-speed lower lubricating device for a bearing ring. The high-speed lower lubricating device comprises an oil gathering sleeve, wherein an inner ring of a bearing and the oil gathering sleeve rotate synchronously; the inner wall of the inner ring of the bearing is respectively provided with a lubricating oil groove in an axial direction and a radial oil hole in a radial direction; one end of the radial oil hole is communicated with the lubricating oil groove, and the other end of the radial oil hole is communicated with a raceway of the inner ring of the bearing; the oil gathering sleeve and the inner ring of the bearing coaxially and fixedly sleeve a main shaft; the oil gathering sleeve is divided into two parts along the axial direction, the inner part of one part is provided with axial oil grooves butted with the lubricating oil groove, and the other part is radially provided with oil gathering passages which are in one-to-one butt joint with the axial oil grooves; the oil gathering passages are separated by a plurality of oil gathering blades distributed in the radial direction; an outer ring of the bearing is fixedly arranged on a shaft shell; the parts, which correspond to the oil gathering passages, of the shaft shell are provided with nozzles connected with a lubricating oil system. The high-speed lower lubricating device is capable of improving the bearing lubricating efficiency, reducing the lubricating oil quantity, further reducing the internal friction heat of the bearing and ensuring that sufficient oil film thickness exists in the raceway during high-speed rotation of the bearing.

The invention relates to a driving shaft assembly of a screw drilling tool capable of maintaining the pressure balance of an oil seal chamber for oil and gas drilling. The technical solution is: oil seal chamber pressure balance screw drilling tool transmission shaft assembly includes upper seal assembly, middle seal assembly and lower seal assembly, etc.; upper seal assembly and middle seal assembly, middle seal assembly and lower seal assembly The cavity between the sealing assemblies is filled with lubricating oil; the upper sealing assembly includes the annular cavity, the piston cylinder and the upper sealing check valve, etc., and the lower sealing device includes the flow channel, the piston chamber, the piston and the lower sealing check valve. Valves, etc.; the balance between the pressure in the sealing cavity and the external drilling fluid pressure is controlled by the up and down sliding of the piston cylinder and the piston, and the opening and closing of the upper sealing check valve and the lower sealing check valve. The invention has the advantages of good sealing performance, long service life, high temperature and high pressure resistance, small friction coefficient and simple structure, and can be used in gas drilling and mud medium drilling with high temperature and strong vibration.

The invention discloses a rotary graphene stripping device including a rotary cylinder body; a top cover is arranged above the rotary cylinder body, a bottom cover is arranged below the rotary cylinder body, the top of the top cover is provided with a feed inlet, the bottom of the bottom cover is provided with a discharge port, and the feed inlet is communicated with the interior of the rotary cylinder body; the outer side of the rotary cylinder body is provided with a first motor, and is used for driving the rotary cylinder body to horizontally rotate; the rotary cylinder body is also internally provided with an inner cylinder, and a second motor used for driving the inner cylinder to horizontally rotate in a direction opposite to the rotating direction of the rotary cylinder body is arranged below the rotary cylinder body; the upper part of the inner cylinder is shrunk in a certain angle, and a material storage space is left between the upper part of the inner cylinder and the upper part of the rotary cylinder body; the lower part of the inner cylinder and the lower part of the rotary cylinder body are in clearance fit to be used for grinding graphite sheets, and a clearance between the lower part of the inner cylinder and the lower part of the rotary cylinder body is successively decreased downward along the axial direction of the rotary cylinder body. The rotary graphene stripping device can achieve successful stripping of graphene. The invention also relates to a graphene production system containing the rotary graphene stripping device and a graphene production method.

The invention discloses a high-speed fine press having a structure that one end of a double-crank rod which has 180-degree phase difference is connected with a movable slide block by a main connecting rod, the other end of the double-crank rod is connected with an auxiliary slide block by an auxiliary connecting rod, same multiple-rod branch chains are symmetrically arranged at the left sides and the right sides of the movable slide block and a pressing slide block so as to connect the movable slide block and the pressing slide block together; the movable slide block makes reciprocation movement up and down under the drive of the double-crank rod and the main connecting rod so as to push a lower connecting rod, an upper connecting rod and a swinging block to swing at two sides through the push of push rods of the two multiple-rod branch chains, and the pressing slide block is further driven to do reciprocation movement up and down, and a workpiece is placed under the pressing slide block, therefore, the pressing processing of metal or nonmetal workpieces is completed. A parallelogram structure of a movable branch chain of the invention can ensure that the pressing slide block is always kept in a horizontal position and the force at horizontal direction of the pressing slide block can be balanced by a mechanism, thereby the capability of uneven loading resistance and the machining precision of the press are enhanced.

Disclosed are a graphene/carbon fiber enhanced nylon composite wear-resistant material and a preparation method and application thereof. The material includes a nylon resin, carbon fibers, graphene/nylon 6 master batch, an organic lubricant, an inorganic solid lubricant, a coupling agent and an anti-oxidant. The method comprises: (1) coupling the inorganic solid lubricant with the coupling agent to obtain a coupled inorganic solid lubricant; (2) mixing graphene/nylon 6 master batch, the organic lubricant, the coupled inorganic solid lubricant and the anti-oxidant; and (3) sending the nylon resin and a mixing auxiliary agent to an extruder, adding carbon fibers, performing mixing extrusion, and performing strap stretching, cooling, drying, and grain-sized dicing to obtain the material. The material is used for lubricating bearings and joint bearings of automobiles, and transmission gears of textile, food and packaging machinery or joint bearings of robots. The material is high in strength, good in thermal conductivity, self-lubrication, and wear resistance, and is long in service life. The method is simple and is suitable for industrial production.

A centrifugal clutch is disclosed, which comprises a drive unit, a friction unit and an assistant unit. The drive unit comprises a base disc and a drive disc. The friction unit comprises a plurality of shaft rods, a plurality of centrifugal counter weights pivoted on each shaft rod, a plurality of friction pieces disposed on each centrifugal counter weight, a plurality of elastic elements connecting the two adjacent centrifugal counter weights, and an outer cover surrounding the friction pieces. The assistant unit comprises a plurality of location pins, a plurality of drive pins, a plurality of linkage pieces sleeved on the location pins and the drive pins, and a location ring disposed on the drive disc. An acting force on each centrifugal counter weight is increased, and the friction force between each centrifugal counter weight and the outer cover is increased by the drive pins, the linkage pieces and the location pins, thereby efficiently avoiding a slip as well as reducing friction heat and vibration.

The invention discloses a wear-resistant and heat-resistant modified polyformaldehyde composite material comprising the following components in parts by weight: 50-80 parts of polyformaldehyde, 10-20 parts of polytetrafluoroethylene, 2-6 parts of MoS2, 0.1-1 part of formaldehyde absorbent, 2-10 parts of compatilizer, 0.3-1 part of antioxidant, 0.1-0.8 parts of coupling agent, and 0.1-0.5 parts of other auxiliary agents. A little of MoS2 and the polytetrafluoroethylene are added to the polyformaldehyde, so that the solubility of the product can be reduced; the size stability and temperature resistance of the product are improved; meanwhile, the effect of friction heat is reduced; and the improved composite material has excellent mechanical property and wear resistance, and has high application prospect in the field of gears with high manufacturing demands and self-lubricating property.

A lubricant sheet for making a hole used for a printed circuit board, comprising an organic substance layer having a thickness of 0.02 to 3.0 mm and formed of a mixture (a) or a mixture (b) and a metal foil having a thickness of 0.05 to 0.5 mm,said organic substance layer being formed on one surface of said metal foil,said mixture (a) being a mixture containing polyether ester (I), a solid water-soluble lubricant (II) and polyethylene glycol (III) having a number average molecular weight of 200 to 600, andsaid mixture (b) being a mixture containing said polyether ester (I), said solid water-soluble lubricant (II) and a liquid water-soluble lubricant (IV), and a method of making a hole which uses the lubricant sheet.

The invention relates to a sealing element, in particular to a low-friction oil seal for a shock absorber. The oil seal comprises a framework and an oil seal body. The oil seal body comprises at least one sealing lip and a dust-proof lip. The oil seal is characterized in that axial parallel veins are arranged on annular sealing surfaces formed by the sealing lips. The sealing lips comprise a first sealing lip and a second sealing lip, and first axial parallel veins and second axial parallel veins are arranged on the annular sealing surfaces formed by the first sealing lip and the second sealing lip respectively. Third axial parallel veins are arranged on an annular sealing surface formed by the dust-proof lip. The low-friction oil seal has the advantages that forming of critical lubricating oil film between contact surfaces of the sealing surfaces and a shock absorber shaft is facilitated, so that the contact area is reduced; and lubricating oil can be stored between the axial veins conveniently, so that the friction coefficient between the oil seal and the shock absorber shaft is reduced, the friction between the oil seal and the shock absorber shaft is reduced on the premise that the radial sealing force is not changed, and the service life of the oil seal is increased.

The invention provides a double-conical-rotor continuous mixing unit. The mixing unit mainly comprises a mixing part and a discharging part and can adopt a single-band or dual-band mode; wherein the mixing part mainly comprises a charging device, a cylinder, conical rotors, heating and cooling devices and a transmission device; the two mixing rotors are conical and the center lines of the two rotors form a certain angle when the two rotors are installed; the outer diameter outline of each mixing rotor is gradually reduced and is conical; the mixing rotors are provided with charging segments and mixing segments; the rotors on the charging segments adopt screw conveying structure; seen from the angle vertical to the conical surfaces of the outer outlines of the rotors, the structures of the mixing segments have the typical rotor characteristics such as cam shape, S shape or four-wing shape; when the mixing unit adopts the single-band mode, the tail ends of the rotors adopt the screw structure and pressure is created to convey the materials to the head; and when the mixing unit adopts the dual-band mode, the mixed materials enter into next band of screw extruder via a valve and pressure is created to convey the materials to the head; the mixing unit in any one of the two modes adopts the head fit for the cavity for pelleting or forming; a melt pump can be connected in front of the head; and two rotors can rotate at the same speed or different speed and form a plurality of shearing, drawing and kneading zones during rotation, and exchange of materials among the rotors is more frequent, thus effectively improving the plasticating, melting and dispersing properties of equipment, shortening the processing time and improving the yield. The mixing unit can be used in such processes as mixing, pelleting and the like during processing rubbers, coatings, propellants, explosives, paper pulp, plastics, food, medicaments, feeds and the like.