31 results about "Babbitt" patented technology

The invention belongs to the technical field of powder metallurgy, and provides a laser cladding-based tin-based babbitt metal preparation method which comprises the following steps: preparing a tin-based babbitt metal by adopting laser cladding to obtain a tin-based babbitt metal with determined process parameters; carrying out an orthogonal experiment under the condition of determining the process parameters, and determining the optimal process parameters; and the tin-based babbitt metal is prepared under the condition of optimal process parameters, and the preparation is completed by determining the lap joint rate. By determining the optimal process parameters of the laser power, the scanning rate and the lap joint rate, the tin-based babbitt metal is suitable for laser deposition forming and repairing.

The invention belongs to the technical field of laser cladding, and relates to a nodular cast iron crosshead with laser-cladded babbitt metal on the surface and a preparation method of the nodular cast iron crosshead. The base material with the set thickness is removed from the to-be-cladded area of the crosshead body, and an appropriate space is provided for subsequent cladding of a component gradient transition area and a babbitt metal cladding layer. Babbitt metal powder is adopted for cladding the component gradient transition area on the to-be-cladded area, so that smooth transition from the nodular cast iron matrix to the Babbitt metal cladding layer can be realized, and a direct basis for forming high-strength metallurgical bonding is provided. And cladding a babbitt metal cladding layer on the component gradient transition area by adopting babbitt metal powder, and finally forming an antifriction layer with excellent wear resistance and seizure resistance on the crosshead working surface. And the cladding babbitt metal cladding layer is machined till the crosshead body is machined to the standard size, and the installation precision of the crosshead body and the matching precision of the crosshead body and other components are guaranteed.

The application discloses a WC reinforced tin-based babbitt alloy composite coating and an ultrahigh-speed laser cladding preparation method thereof, and belongs to the technical field of laser additive manufacturing and surface engineering. The coating is composed of WC particles and a SnSb11Cu6 matrix, the WC particles are uniformly and dispersedly distributed in the matrix, and the coating is free of cracks and through pores. The preparation method comprises the following steps: mixing WC particles with SnSb11Cu6 powder, drying, and then cladding on a 20 steel matrix by using an ultrahigh-speed laser cladding (EHLA) technology. Compared with a pure babbitt alloy coating, the hardness of the coating is increased by 45%, and the wear rate is reduced by 37%, the hardness and wear resistance are simultaneously improved, and the WC particle agglomeration and excessive melting are avoided, so that the coating is suitable for surface strengthening and remanufacturing of sliding bearing bushings.

The invention discloses a martensite reinforced self-lubricating copper-based alloy coating and a laser cladding preparation method thereof, the martensite reinforced self-lubricating copper-based alloy coating comprises the following components in percentage by mass: 66 to 84 weight percent of Cu, 10 to 20 weight percent of Al, 3 to 10 weight percent of Ni, 3 to 10 weight percent of Mn, 0 to 2 weight percent of Sn and 0 to 2 weight percent of Pb. In the preparation process, the laser input energy density is controlled within the range of 8.96-13.27 J / mm, and the double strengthening effects of grain refinement and martensite content increase can be synchronously achieved. The main phase structure of the obtained coating is twin-crystal martensite, meanwhile, the coating contains a small amount of alpha-Cu lubricating phase, gamma phase and Fe-rich hard phase, and the dry friction coefficient of the coating is 1t; 0.35, and the solidification hardness gt; and the voltage is 350HV. Compared with the existing self-lubricating tin-based babbitt metal and copper-tin alloy with similar friction coefficients, the coating disclosed by the invention realizes synergistic improvement of high hardness and low friction performance, and is particularly suitable for dynamic friction and wear working conditions with higher impact resistance requirements, such as robot motion joints, precision mechanical transmission parts and the like.

The invention relates to the technical field of alloys, in particular to a composite babbitt metal wire and a preparation method and application thereof. The composite Babbitt metal wire is prepared from the following components in percentage by mass: 1%-3% of short carbon fibers, 0.4%-1.6% of Ni fibers and the balance of Babbitt metal powder. The short carbon fibers and the Ni fibers are added at the same time and have a synergistic effect to play a reinforcing effect of 1 + 1 > 2, so that the strength and the hardness of the composite babbitt metal wire can be remarkably improved, the friction coefficient and the wear rate of the composite babbitt metal wire are reduced, and the composite babbitt metal wire is not prone to deformation and wear when bearing high load, and the service life of the composite babbitt metal wire is prolonged. In addition, the high-temperature stability of the composite babbitt metal wire can be improved, and the comprehensive performance is good.

The application discloses a dynamic and static pressure mixed vertical thrust bearing structure, which comprises a rotating shaft, a thrust mirror plate and a ring-shaped support frame, the rotating shaft is inserted into a vertical through hole in the center of the support frame, the top end of the rotating shaft is fixed with the middle bottom surface of the thrust mirror plate, and the thrust mirror plate is above the support frame; a downward extending ring-shaped mounting cavity is formed in the middle of the top surface of the support frame, a plurality of alloy thrust pads and non-metallic thrust pads are mounted in the ring-shaped mounting cavity, all the alloy thrust pads and the non-metallic thrust pads are arranged at intervals and are uniformly distributed in the ring-shaped mounting cavity with the vertical central axis of the support frame as the center, and the babbitt alloy layer of the alloy thrust pad and the non-metallic layer of the non-metallic thrust pad are tightly attached to the bottom surface of the thrust mirror plate. The alloy thrust pad forms static pressure lubrication, the non-metallic thrust pad forms dynamic pressure lubrication, the dynamic and static pressure lubrication of different thrust pads is combined, the normal and reliable operation of equipment is ensured, the structure is reasonable, the lubrication is reliable, the operation is stable, and the service life is long.

The application provides a high-thermal-conductivity bushing and a preparation method thereof. The preparation method comprises the following steps: pretreating raw materials to prepare a preformed block alloy slurry; mixing the preformed block alloy slurry with high-thermal-conductivity fibers to obtain a preformed alloy block; performing surface treatment on a steel base body; welding the steel base body subjected to the surface treatment and the preformed alloy block to obtain a crude high-thermal-conductivity bushing; and performing heat treatment on the crude high-thermal-conductivity bushing to obtain the high-thermal-conductivity bushing. The preformed block alloy slurry comprises at least one of Sb, Cu, Ni, Ag, Co, Yb and Sn. The application solves the problem that, in the prior art, the wettability of the reinforcing body is poor, the density of the reinforcing body and the base body are not matched, and segregation is prone to occur, which results in the difficulty in preparing the babbitt layer on the surface of the bushing and thus affects the processing efficiency of the babbitt layer on the surface of the bushing.

The invention discloses a sliding bearing free-form surface babbitt metal laser cladding system and a control method thereof. The laser cladding system comprises a mechanical arm, laser cladding equipment, a parallel platform, a femtosecond laser micromachining module, a molten pool monitoring camera, contour scanning equipment and an X-ray defect detector. Through cooperation of the mechanical arm and the parallel platform, the laser cladding equipment maintains the optimal deflection angle, the situation that a cladding layer is not uniform due to curved surface inclination is avoided, and the parallel platform adjusts the angle to achieve the optimal shape of a molten pool when the molten pool laterally deviates; full-closed-loop control from molten pool morphology recognition to process parameter adjustment is constructed through multi-mode sensing and monitoring fusion, and the collapse or protrusion defect of a cladding layer is remarkably restrained; the X-ray defect detector and the femtosecond laser micromachining module are combined, bubble defects in the cladding layer and on the bonding interface of the cladding layer and the sliding bearing bush to be cladded are detected and removed in real time, and cladding layer crystallization is finer and more uniform.

The utility model provides a sliding bearing babbitt metal casting tool, which belongs to the technical field of sliding bearing production equipment and comprises a supporting mechanism. Comprising a supporting frame, a casting ladle rotationally installed on the inner side of the supporting frame, a top frame fixedly installed on the top of the supporting frame, a driven gear fixedly connected with the casting ladle, and a driving gear installed on the surface of the supporting frame through a connecting rod bearing and engaged with the driven gear. And the angle positioning mechanism comprises a positioning component playing a damping role in rotation of the driven gear and a damping component used for adjusting the pouring angle of the casting ladle. According to the utility model, the driven gear is damped through the positioning part, and the driven gear is prevented from rotating too fast or suddenly, so that the stability of the casting ladle during pouring and casting is improved; the pouring angle of the casting ladle is positioned and adjusted through the damping component, the problem that fixed-angle pouring of a traditional casting ladle is difficult to achieve is solved, the effect of quantitative casting of alloy liquid is achieved, and then the casting efficiency of specific workpieces is improved.

This utility model discloses a melting and casting device for recycling Babbitt alloy from a pear-shaped steel wire rope sheath. It includes a housing, a medium-frequency induction furnace housed within the housing, and a casting mold. The medium-frequency induction furnace comprises a furnace body, a capacitor box, and a power supply box. The furnace body has a hollow structure extending vertically, with a lifting port at the top and an open bottom. The furnace body is designed with three layers from the outside in: an outer layer of heat insulation plate, a middle layer of induction coils arranged in a spiral pattern using hollow copper tubes, and an inner layer of fireproofing mud. The power supply box is electrically connected to the capacitor box and the induction coils. The casting mold is located below the furnace body. Eddy currents are generated inside the pear-shaped steel wire rope sheath suspended in the furnace by the induction coils, generating heat to heat the sheath. When the heating temperature exceeds 230°C, the Babbitt alloy inside the sheath melts rapidly, forming a flowing liquid that drips directly into the casting mold below. Finally, it cools and is demolded, achieving effective recycling of the alloy.

The invention provides a preparation method of a tin-based babbitt metal brazing coating and a preparation method of a tin-based babbitt metal bearing bush. The preparation method of the brazing coating comprises the steps that a bearing bush base plate is pretreated; alloy powder paste fluid is prepared; coating the alloy powder paste fluid on the surface of a substrate, and drying to form an alloy powder coating; cMT additive welding is conducted, a welding wire is melted at high temperature and subjected to an in-situ reaction with the alloy powder coating on the surface of the base plate, and a tin-based babbitt metal brazing coating is synthesized in situ; the preparation method of the bearing bush comprises the steps that the tin-based babbitt metal brazing coating is synthesized in situ, and the bearing bush is machined to the target size. According to the preparation method of the tin-based babbitt alloy brazing coating and the preparation method of the bearing bush, the technology of volatilizable paste alloy powder and CMT secondary metallurgy is adopted, the tin-based babbitt alloy brazing coating is synthesized in situ, the brazing coating has the excellent organization structure and performance, crystal grains of the brazing coating are fine and evenly distributed, and the hardness of the brazing coating is greatly improved. The strength, the wear resistance and the fatigue resistance of the bearing bush can be obviously improved.

The invention discloses a method for cladding babbitt metal on a bearing cover. The method comprises the steps of (1) equipment electrification, (2) tool installation, (3) workpiece installation, (4) robot programming, (5) welding programming, (6) welding starting, (7) welding ending and the like. An efficient, convenient and easy-to-operate welding mode is provided, the operation efficiency is improved, the operation difficulty is reduced, and the welding quality is greatly improved.

The invention discloses a machining method for a guide shoe of a radial tilting pad sliding bearing, and belongs to the technical field of guide shoe machining, and the machining method for the guide shoe of the radial tilting pad sliding bearing is characterized in that the machining method for the guide shoe of the radial tilting pad sliding bearing comprises the specific steps that S1, a steel pipe is prepared, the steel pipe is cut into a preset length, and an inner hole of the steel pipe is machined; s2, the steel pipe is cut, specifically, the steel pipe is averagely cut into 6-equal-part long-strip-shaped tile blanks through linear cutting; s3, a bearing alloy layer is formed, specifically, the long-strip-shaped tile blank is placed on an adjusting clamp, babbitt metal is formed on the inner hole face of the long-strip-shaped tile blank through a welding or laser cladding method, annealing heat treatment is conducted on the tile blank where the babbitt metal is formed, and internal stress formed by machining is released; s4, the tile blank is cut, and the guide tile with the needed width is cut on the long-strip-shaped tile blank according to the design requirement; and S5, finish machining is conducted, specifically, the outer circle face and the inner hole face of the guide shoe are subjected to finish machining treatment, and the finished guide shoe is obtained. The production and manufacturing efficiency of the guide shoe can be improved, and the material loss is reduced.

The invention relates to the technical field of bearing alloys, in particular to a fiber-reinforced babbitt metal welding rod and a preparation method thereof. The welding rod comprises Babbitt metal and reinforced fibers, the welding rod structurally comprises a strip-shaped core layer alloy and an outer layer alloy wrapping the outer side of the core layer alloy, and the reinforced fibers are located in the core layer alloy or the outer layer alloy. According to the method, the reinforcing fibers are bonded to the specific area of the Babbitt metal wafer, the Babbitt metal stack is prepared, the welding rod is prepared through ultrasonic-assisted extrusion, the reinforcing fibers can be distributed in the specific area of the welding rod, and the plasticity or rigidity of the fiber-reinforced Babbitt metal welding rod can be improved by controlling distribution of the reinforcing fibers; and the use performance in different application scenes is improved.

The invention relates to the technical field of bearing alloys, in particular to a fiber-reinforced babbitt metal wire and a preparation method thereof. The preparation method comprises the following steps: S1, taking a plurality of Babbitt metal wafers, coating at least one surface of each Babbitt metal wafer with an adhesive, and then adhering reinforced fibers to the whole surface of each Babbitt metal wafer to obtain a Babbitt metal wafer for extrusion; s2, sequentially putting the Babbitt metal wafers for extrusion into a preheated extrusion cylinder for stacking, then extruding to obtain an extruded wire, and drawing to obtain a fiber-reinforced Babbitt metal wire; wherein the melting failure temperature of the adhesive is lower than the extrusion temperature. The fiber-reinforced babbitt metal wire prepared by the method can avoid fiber burning loss, is uniform in fiber distribution, good in product consistency, high in strength, good in wear resistance, high in bearing capacity and low in friction coefficient.

The invention relates to the technical field of bearing alloys, in particular to a high-plasticity fiber-reinforced babbitt metal wire and a preparation method thereof. The preparation method comprises the following steps: S1, taking a Babbitt metal wire containing reinforced fibers, and recording the Babbitt metal wire as an alloy wire A; a pure Babbitt metal wire is taken and marked as an alloy wire B; s2, a plurality of alloy wires B are arranged on the outer side of the alloy wire A in a stranded or parallel arrangement mode to be stranded, the two ends of the alloy wires B are welded and fixed, and a single multi-strand wire is obtained and recorded as a preformed wire material; and S3, preheating and drawing the pre-formed wire, so that multiple strands of wires are combined together, and the high-plasticity fiber-reinforced babbitt metal wire is obtained. According to the Babbitt metal wire prepared through the method, the reinforced fibers are located in the core of the alloy wire, the pure Babbitt metal is arranged on the outer side of the alloy wire, the whole alloy wire is good in plasticity, the wire is not prone to being broken in the using process, the interface wettability to a steel matrix is good, and fiber scattering and high-temperature burning loss can be restrained in the additive manufacturing process.

The invention discloses a laser hybrid welding method for a sealing part. The laser hybrid welding method comprises the following steps that an I-shaped groove is formed in the welding butt joint face of an end face circumferential weld of an annular table and an annular hole; a brazing filler metal annular groove is formed in the welding butt joint face; oil stains on the welding butt joint face are removed; brazing filler metal is placed in the brazing filler metal annular groove; the sleeve is arranged in the annular hole of the cover; the sleeve and the cover are welded and fixed at the welding butt joint surface of the ring table and the ring hole by adopting laser spot welding; and welding end face circumferential welds at the welding butt joint surfaces of the sleeve and the cover by adopting laser deep penetration welding. By adopting the method, the heat transferred to the Babbitt metal layer is reduced while the depth of the welding seam is ensured, the problems of falling off, tilting and the like of the welded Babbitt metal layer are avoided, and the welding quality stability of the sealing part is greatly improved.

Disclosed is a method for repairing a Babbitt metal bearing shoe by laser cladding, metal plates are placed around a cladding range, thereby assisting in cooling a cladding area and accelerating heat conduction of a base material in the cladding area, and since the metal plates protrude out of a surface of the cladding area to form a step-like shape, thereby avoiding a phenomenon of an undercut of an edge side cladding channel; and by planning an area to be repaired, the cladding area is limited in a range as small as possible, and in addition, the metal plates are arranged around the cladding area for cooling, thereby avoiding a phenomenon of decladding of an original Babbitt metal layer caused by overheating deformation.

The invention discloses a high-temperature oxidation-resistant babbitt metal wire as well as a preparation method and application of the high-temperature oxidation-resistant babbitt metal wire. Belongs to the technical field of alloy wires. According to the wire, a NiCr alloy coating with the thickness of 1-2 microns is arranged on the surface of a babbitt metal matrix. The plating layer melts along with the babbitt metal under the action of high temperature, the Cr element is used for stabilizing droplet transition so as to reduce shielding gas involved in air in the disturbance process, oxidation films of Ni and Cr elements are used for preventing oxygen diffusion, the droplet evaporation and metal steam oxidation process is remarkably inhibited, and therefore oxide generation in the high-energy machining process is greatly reduced. Experiments show that the oxide is reduced by more than 80% under the arc fuse wire additive process; under the laser fuse wire additive process, the oxide is reduced by more than 30%; and under the plasma fuse spraying process, the oxide is reduced by more than 20%. According to the wire, the process stability and the cladding layer quality can be effectively improved, and the bonding strength of the prepared cladding layer and the base material is also improved to a certain extent.

The thrust bearing bush comprises a steel base layer located at the bottom, a babbitt metal layer is arranged above the steel base layer, and an antifriction wear-resistant lubricating layer is arranged above the babbitt metal layer. The friction coefficient between the runner plate and the bearing bush is reduced, the wear resistance of the bush surface is improved, the friction-reducing and wear-resisting layer can ensure a smaller dry friction coefficient in the starting stage, the starting torque can be reduced, and a machine can be easily started even if a high top is cancelled; and at a low rotating speed, even if an oil film is not formed, the tile surface can be better protected by virtue of the wear-resistant characteristic of the antifriction wear-resistant layer.

The invention discloses a sliding bearing babbitt metal gravity casting method, and belongs to the technical field of casting, and the technical scheme is characterized in that the method comprises the specific steps that S1, a tile blank to be cast is placed in a pressure tank; s2, air conveyed by an air compression pump is dried and heated through an air dryer and then stored in an air storage tank; s3, before casting, the pressure tank is sealed, and hot air in the air storage tank is conveyed into the pressure tank to be preheated; s4, after preheating is completed, the pressure tank is opened, babbitt metal is cast on the tile blank, then the pressure tank is rapidly sealed, compressed air in the air storage tank is released into the pressure tank, the preset air pressure and temperature are reached in the pressure tank, the solidification speed of the babbitt metal is delayed, and the tile blank is cooled to the room temperature; and gas dissolved in the babbitt metal is separated out through the additional pressure, and mingled light oxidized slag floats upwards. According to the invention, the generation of defects in the gravity casting process of the babbitt metal can be reduced.

The application discloses a method for improving bearing capacity of a bearing bush and the bearing bush, and adopts a laser cladding process to form a layer of babbitt alloy on a bearing bush base body, the babbitt alloy layer is unevenly distributed on the bearing bush base body, and the proportion of hard phase particles in a bearing area of the bearing bush base body is greater than that in a non-bearing area, so that the bearing capacity and the creep resistance of the bearing bush are improved.

The application belongs to the technical field of babbitt alloy preparation, and discloses a method for preparing babbitt alloy by vacuum arc melting, which comprises the following steps: S1, mixing Sn powder, Sb powder and Cu powder, ball milling under inert atmosphere to obtain mixed alloy powder; S2, cold pressing the mixed alloy powder to form a block-shaped blank; S3, placing the block-shaped blank on a vacuum arc furnace working platform, vacuumizing, filling with inert gas, and melting to obtain babbitt alloy. The method for preparing babbitt alloy by vacuum arc melting can effectively solve the problem of poor corrosion resistance of traditional cast babbitt alloy. Electrochemical test shows that, in a 3.5wt% NaCl solution, the polarization resistance of the babbitt alloy prepared by the method is significantly improved, the corrosion current density is obviously reduced, and the corrosion resistance is better than that of the babbitt alloy prepared by the traditional casting method.

The invention discloses an oil distribution ring structure based on welding cladding babbitt metal and a manufacturing method, and relates to the technical field of hydraulic oil distribution of a marine controllable-pitch propeller device.The oil distribution ring structure comprises a detection table, a transmission device is installed in the detection table, a detection frame is installed on the side, close to the transmission device, of the detection table, and a flaw detector is installed on a transmission belt; according to the multifunctional switching linkage mechanism of the scheme, the first platform and the second platform are driven to move by means of the transmission wheel and the transmission belt, double-station rapid switching is achieved through the cooperation of the arc-shaped groove and the U-shaped pulling plate, and the switching time is controlled within 5 seconds. When detection is carried out on one station, the other station can synchronously complete feeding, a continuous cycle of feeding, detection and discharging is formed, the single cycle time is controlled within 20 seconds, the average daily yield can reach 5760 pieces, the efficiency is improved by 92% compared with that of traditional single-station equipment, and the requirement for batch production can be met.

The invention relates to a gear pump spacer bush and a machining method thereof, and relates to the technical field of alloy preparation. The gear pump spacer bush comprises a low-carbon steel base shell and a babbitt metal layer compounded on the inner wall of the base shell. The babbitt metal layer comprises the following components in percentage by mass: 11.36 to 11.63 weight percent of antimony, 3.0 to 4.0 weight percent of copper, 0.3 to 0.5 weight percent of bismuth, 0.2 to 0.4 weight percent of zinc, 0.1 to 0.2 weight percent of cerium, 0.03 to 0.05 weight percent of aluminum and the balance of tin; the thickness of the babbitt metal layer is 2 to 3mm; the preparation method comprises the steps of base shell machining, degreasing, rust removal, solvent coating, alloy preparation, centrifugal casting and cooling demolding. By forming the interlaced hard phase, the hardness, wear resistance and thermal stress resistance of the spacer bush are improved, the stability of a hydraulic system is guaranteed, and the purpose of prolonging the service life is achieved.

The application discloses a kind of bionic texture gradient coating multifunctional sliding bearing and its design preparation method, bearing shell matrix material is babbitt or aluminum magnesium alloy, bearing shell matrix surface has fan-shaped microtexture of imitating fish scale and alternately distributed laminated coating, the first layer of the laminated coating is ZrO2 layer, the second layer is SbNaB layer, the third layer is AlTeVN layer;Fan-shaped microtexture of imitating fish scale is arranged in the same direction, fan-shaped texture angle θ1 is 18-90 °, texture depth gradually decreases from fan-shaped circle center to edge, gradually depth angle θ2 is 32-72 °, fan-shaped texture radius r is 30-160 μm, fan-shaped texture width d is 15-65 μm, texture transverse array spacing l x 80-320 μm, texture longitudinal array spacing l y 90-360 μm.The bearing can realize multifunctional effect, under fluid lubrication condition, the bearing can play the role of reducing friction to maximum amplitude when positive rotation, can maximum amplitude improve carrying capacity when reverse rotation;ZrO2 layer has self-lubricating effect, when temperature is higher, SbNaB, AlTeVN, ZrO2 can occur in situ reaction, generate Sb2O3, V2O5 lubricant with lubricating effect, realize bearing high temperature lubrication, effectively reduce bearing wear, improve bearing life.

The invention relates to a spherical hinge connection type tilting pad thrust bearing structure, and aims to solve the problems of insufficient lubricating performance, poor heat dissipation performance and insufficient posture adjustment flexibility of thrust blocks in the prior art. The structure comprises a transmission shaft, a ball socket type thrust block, a ball head connecting column, a thrust bearing disc, a thrust bearing disc fixing ring piece, a thrust bearing outer shell, an O-shaped ring, a locking nut and a hydraulic bent pipe. The ball socket type thrust block is connected with the ball head connecting column through a spherical hinge pair, a hydraulic oil channel and a damping hole are formed in the ball head connecting column, and hydraulic oil flows into the ball head connecting column through the hydraulic bent pipe and further flows through the damping hole of the ball socket type thrust block, so that oil-way circulation for lubrication and heat dissipation is formed. Babbitt metal is sprayed to the bottom of the ball socket type thrust block, abrasion resistance is improved, the ball socket type thrust block can be connected with the ball joint column in a thermal expansion and cold contraction mode, and self-adjustment of the working posture is achieved. The thrust bearing disc is provided with a limiting ring, the swing angle of the thrust block is limited, and installation is convenient. By optimizing the structural design, forced lubrication in the whole working condition period is achieved, the lubrication and heat dissipation performance of the thrust bearing under the high thrust working condition is remarkably improved, meanwhile, the flexibility of self-adaptive adjustment of the pose of the thrust block is enhanced, and the thrust bearing is suitable for various high-load transmission systems.

The present invention discloses a method for precision repairing large support rollers for a rolling mill. The method comprises the following steps: analyzing and confirming the accuracy of key dimensions of the support roller to be repaired; replacing worn bearing seat rings, heating and installing new rings to ensure an interference fit, and measuring the grinding amount; making a babbitt alloy support shoe, calibrating the support roller installation accuracy, and ensuring coaxiality; covering the contact surface between the grinding wheel and the roller with clean grinding fluid; polishing the roller neck to ensure a burr-free surface; hoisting a standard support roller, calibrating the center of the grinding machine, calculating the bearing seat repair dimensions, and performing an idle run; grinding the bearing seat to ensure that the dimensions, circular runout, coaxiality, and roughness meet the standards; replacing the support shoe, calibrating the grinding machine, and then calculating the roller body repair dimensions and performing an idle run; grinding the roller body using the repaired bearing seat as a reference to ensure that the coaxiality and circular runout meet the standards; and inspecting the overall dimensions using the grinding machine's measurement function. The present invention solves the problem that existing methods for precision repairing large support rollers for rolling mills cannot meet the required support roller accuracy.

An asymmetric dynamic pressure sliding bearing relates to the technical field of dynamic pressure sliding bearings and comprises a bearing bush which is defined by an upper bush body and a lower bush body and used for supporting a rotor, a main bearing area and a non-main bearing area are formed on the inner wall face of the bearing bush in the rotating direction of the rotor, and the surface of the main bearing area and the surface of the non-main bearing area are both coated with babbitt metal layers. The parts, close to the two ends of the bearing bush, of the non-main bearing area are concave towards the outer side wall of the non-main bearing area to form a concave area with the surface not coated with the babbitt metal layer, and a step structure is formed between the concave area and the non-main bearing area with the babbitt metal layer. The power consumption and temperature rise of the sliding bearing are effectively reduced, meanwhile, the risk that the babbitt metal layer is damaged is reduced, the bearing capacity and stability of the dynamic pressure sliding bearing are improved, and the dynamic pressure sliding bearing can meet more complex and harsh service conditions.

The utility model relates to the field of sliding bearing manufacturing, in particular to a sliding bearing Babbitt metal centrifugal casting machine which comprises a machine frame, a variable frequency motor is fixed to the rear machine frame, the rear machine frame is rotationally connected with a main shaft, the main shaft is driven by the variable frequency motor, and the main shaft is fixedly connected with a first clamping plate. Two oil cylinders are fixed on the front rack and are positioned above the front rack; a second clamping plate is fixed to the telescopic end of the oil cylinder, a workpiece is clamped between the second clamping plate and the first clamping plate, and a hollow shaft is fixed to the center of the second clamping plate. A funnel is slidably connected to the supporting guide rail. The funnel is driven by a cylinder which is fixed on the front rack; a flame gun is fixed on the front rack and faces the funnel; protective covers are arranged outside the first clamping plate and the second clamping plate. The processes of funnel preheating, workpiece clamping and positioning, workpiece rotating, metal conveying, centrifugal attaching, rapid cooling and the like in the casting process are achieved, meanwhile, safety is improved, and the capacity of adapting to workpieces of different sizes is higher.