36results about How to "Small thermal deformation" patented technology

The utility model discloses a turnover embracing column support for accurate positioning and installation of a large-span orthogonal steel truss, which comprises a steel column, an annular steel column hoop is connected with the steel column through high-strength bolts, a triangular steel platform is welded with the annular steel column hoop, steel column brackets are arranged on two sides of the steel column, and the triangular steel platform is connected with the annular steel column hoop through high-strength bolts. The steel column bracket is used for being welded with a large-span orthogonal truss steel beam; steel column hoops are arranged on supports on the two sides of a large-span steel structure, a tripod steel platform is hinged to steel columns, and the tripod steel platform serves as a supporting point of the large-span steel truss and serves as a horse stool for welding a vertical component bracket and the large-span steel truss, so that a welder is helped to keep a welding piece at the correct position and angle, and the welding efficiency is improved. In the welding process of the large-span steel truss, the split heads can prevent a welding piece from displacing due to the influence of gravity or welding heat in the welding process, meanwhile, uniform supporting force can be provided, thermal deformation in the welding process can be reduced, the original shape and size of a steel structure can be kept, and therefore the welding precision and quality are guaranteed.

The invention belongs to the technical field of brazing, and particularly discloses a vacuum brazing method for chromium-zirconium-copper and stainless steel, a brazing joint and application, and the method comprises the following steps: cutting chromium-zirconium-copper and stainless steel base materials into round bars: preparing a Ni coating on the surface of the stainless steel after the stainless steel base material is pretreated; the Ag15CuP brazing filler metal is preset on a to-be-welded interface and placed in a vacuum brazing furnace, vacuumizing and heating are conducted, and then the Ag15CuP brazing filler metal is cooled to the room temperature; and low-temperature stress relief annealing is conducted on a brazed finished product, and furnace cooling is conducted to the room temperature. According to the vacuum brazing method for the chromium-zirconium-copper and the stainless steel, the brazing joint and the application, the novel silver-saving brazing filler metal Ag15CuP is selected as the brazing filler metal, efficient and reliable connection of the chromium-zirconium-copper and the stainless steel is achieved through the synergistic process scheme of stainless steel surface nickel plating modification, gradient temperature control vacuum brazing and low-temperature annealing, and the service life of the chromium-zirconium-copper and the stainless steel is prolonged. The obtained brazed joint is excellent in high-temperature and low-temperature cycle resistance, and can meet the service requirements of key components such as an airspace engine combustion chamber and a heat exchanger.

The application discloses a fast-axis collimating lens and an optical device with the same, and relates to the technical field of laser optical elements. The fast-axis collimating lens comprises a cylindrical base and a composite film layer arranged in sequence along the direction of incident light. The light-in surface of the cylindrical base is a plane, the light-out surface of the cylindrical base is a convex surface, and the radius of curvature of the cylindrical base is greater than 2.5 mm. The composite film layer comprises at least one high-refractive-index transmission film layer, and the refractive index of the high-refractive-index transmission film layer ranges from 1.8 to 2.4. The fast-axis collimating lens is used to realize the collimating function by the synergic design of the film layer and the base structure, the low-convexity base is matched with the high-refractive-index transmission film layer, the processing and integration are facilitated, and the optical and mechanical properties are effectively improved.

The utility model discloses a kind of aluminum alloy ship body welding deformation control mechanisms, including multiple webs, web is welded at the welding gap of first ship plate and second ship plate, web is vertically arranged with the surface of first ship plate and second ship plate, the length direction of web is perpendicular to the welding gap of first ship plate and second ship plate, web bottom is provided with the bottom edge of widening to both sides, and welding groove is spaced along bottom edge;Welding groove is distributed at the contact of bottom edge and ship plate, the cross section of welding groove is arc, the bottom end of welding groove and ship plate smooth transition tangent contact;Connecting fixing mechanism is equipped between adjacent webs;By web auxiliary material positioning welding, increase auxiliary material in the relatively sparse area of original structure, by positioning welding mode welding, keep the structure of original strong force component unchanged, auxiliary increase the overall stress of sparse and weak area, welding is more stable and reliable, not easy to weld deformation.

The utility model relates to the technical field of grinding device cooling, and discloses an inclined spraying type rotating shaft for a grinding wheel, which comprises a first shaft body and a second shaft body, the flow guide channel penetrates through the outer wall of the first shaft body; the included angle between the center line of the liquid outlet of the flow guide channel and the axis of the first shaft body is an acute angle; the second shaft body is used for coaxially installing a grinding wheel. The grinding wheel cooling device has the effect that the grinding wheel with the short length can be cooled conveniently.

The utility model relates to a cold bed waste heat recovery technical field especially relates to a kind of steel rolling cold bed composite heat recovery system. Steel rolling cold bed composite heat recovery system includes heat exchange structure and drive structure. Heat exchange structure includes heat preservation cover, heat exchange component and air door component, heat preservation cover cover is located in the high temperature area of cold bed, heat preservation cover has the installation cavity towards high temperature area, heat exchange component is set in installation cavity, and heat exchange component inside flows through heat exchange medium;At least one opening is provided on heat preservation cover, an air door component is provided at one opening, and the air door component is used to partially cover or entirely cover opening;Drive structure includes support and driving part, support includes stand and rotating frame, heat exchange structure is rotationally arranged on stand by rotating frame, driving part drives rotating frame to rotate relative to stand, to drive heat exchange structure to be located at maintenance position or heat recovery position;Heat recovery position has multiple, heat exchange structure is located at different heat recovery position, and the spacing of heat exchange structure and cold bed in vertical direction is different.

The application belongs to the technical field of laser additive manufacturing, and particularly relates to an array type laser additive manufacturing method and device, which comprises the following steps: S1, digital model import and layering slicing; S2, scanning path planning and filling setting; S3, array type laser synchronous output control; S4, powder flow and powder feeding path control; S5, according to the width of the additive, the width of single track cladding is adjusted in real time; S6, according to the slice layer material of the additive, the matching material is delivered; S7, S1-S6 are repeated, and layer-by-layer accumulation is performed until the part manufacturing is completed. The application can accurately control the grain size, improve the material microstructure, and improve the mechanical properties; the generation of defects such as thermal cracks and pores is reduced, the stability of the deposition process is ensured; the interlayer bonding is optimized, the quality of multi-layer deposition is ensured; the residual stress is reduced, the size precision, shape stability and fatigue performance of the part are improved; the post-processing requirement is reduced, and the processing cost is reduced.

This invention relates to the field of automotive technology, specifically to a design method and storage medium for reducing thermal deformation of automotive exterior parts. The method includes: establishing a finite element model of the automotive exterior parts and surrounding connectors; setting the cut-off boundary of the connectors and constraining all degrees of freedom of the cut-off boundary; setting installation constraints at the mounting points, connecting the mounting constraints to the connectors, and obtaining the first position of the mounting points; creating temperature conditions; obtaining thermal deformation data of the exterior parts through finite element software analysis, and obtaining the second position of the mounting points; calculating the offset D1 between the second position and the corresponding first position; determining whether the offset D1 is within the design target deviation D2 range; optimizing the position and constraint type of the mounting points so that the offset D1 is within the target deviation D2 range, making the offset of each mounting point evenly distributed, thereby reducing the thermal deformation of automotive exterior parts under high or low temperature environments and improving product quality.

The utility model relates to a kind of differential and vehicle, its shell is fixedly connected by welding with main reduction gear, shell is constituted by two half shells and is respectively installed in the axial both sides end surface of main reduction gear. Fixed part for and half shell welding is equipped on the axial both sides end surface of main reduction gear, and positioning part spaced apart from fixed part welding area in radial direction is also equipped, and positioning part supports half shell when welding. The technical scheme will positioning part and welding area be spaced apart, avoid the influence of positioning accuracy by heat distortion generated in welding process, can effectively improve the assembly accuracy and overall performance of differential, ensure the reliable operation of differential.

The utility model discloses a grinding wheel convenient to disassemble and assemble, relates to the technical field of grinding wheels, and aims to solve the technical problem that the heat dissipation mode of the grinding wheel cannot adapt to workpiece production. The grinding wheel comprises a grinding wheel body, fixing disc teeth are installed in the centers of the two sides of the grinding wheel body, concave-convex clamping teeth are arranged at the outer side ends of the fixing disc teeth, and a liquid storage groove is formed in the outer side of the grinding wheel body. The inner end of the liquid storage groove is communicated with a liquid return groove, an outer wrapping liquid storage ring surrounds the periphery of the grinding wheel body, the liquid return groove is communicated with the outer wrapping liquid storage ring, an extrusion head is arranged in the liquid storage groove and comprises an elastic chuck, the elastic chuck is made of elastic materials, and an extrusion sleeve is installed at one end of the elastic chuck. And one-way valve heads are respectively arranged at positions, inside and outside the liquid storage tank, of the extrusion sleeve. Internal circulation cooling can be carried out in the grinding wheel, the temperature of a machining area is reduced, thermal deformation of workpieces is reduced, meanwhile, abrasion and falling speed of grinding particles of the grinding wheel is slowed down, the service life of the grinding wheel is prolonged, and production cost is reduced.

This invention relates to the field of lithium battery technology, and in particular to a method for preparing a lithium-ion battery cell. The invention discloses a method for preparing a lithium-ion battery cell, comprising: first, preparing a positive electrode slurry containing modified titanium aluminum carbide, graphene oxide, etc., and a negative electrode slurry containing aminated carbon nanotubes, zinc aluminum spinel, etc., both processed according to specific proportions and processes; second, coating the positive and negative electrode slurries separately onto a current collector, and obtaining positive and negative electrode sheets through drying, coating with a coating agent, etc.; next, preparing a composite separator coated with a separator coating agent and curing it; finally, winding the separator in a positive-separator-negative-separator sequence, and obtaining a lithium-ion battery cell through drying, encapsulation, electrolyte injection, formation, etc.

This utility model provides a wear-resistant and high-toughness composite titanium-based cermet cutting tool, relating to the field of metal cutting technology. It includes a tool head assembly, which comprises a titanium-based cermet base, a transition layer, and a composite wear-resistant coating. The composite wear-resistant coating is deposited on the surface of the tool head assembly by magnetron sputtering. The transition layer covers the outer side of the composite wear-resistant coating. The tool head assembly consists of a titanium-based cermet base, a transition layer, and a composite wear-resistant coating. The 8-12μm thick composite wear-resistant coating is applied to the surface by magnetron sputtering, effectively resisting wear and significantly extending the tool head's service life. The transition layer covers the outer side, enhancing the bonding force between the coating and the base, uniformly dispersing stress, and improving overall stability. The cutting edge on the outer side of the titanium-based cermet base has a reasonable angle design for efficient cutting. A locking groove below the base forms a tool clamping rod, providing a secure connection and facilitating installation and disassembly. This allows the tool head assembly to operate accurately and efficiently in various cutting operations, reducing maintenance costs and improving processing efficiency and product quality.

The utility model relates to flange screw production technical field discloses a kind of grinding devices for flange screw production, including workbench, the upper surface of workbench is fixedly installed with portal frame, and grinding equipment is arranged on portal frame, wherein, grinding mechanism is arranged on workbench, the grinding device for flange screw production, water is sprayed to flange screw surface by spray pipe corridor, water mist is sprayed, dust particles can be combined with water mist, increase weight and settle down, thereby effectively reduce the concentration of dust in air, reduce the risk of worker inhaling dust, protect the health of worker, and spraying can take away the heat generated by polishing in time, reduce workpiece surface temperature, reduce thermal deformation, ensure the size accuracy and surface quality of workpiece, at the same time, water mist can also flush away the debris and impurities generated in polishing process, avoid these particles to cause secondary scratch on workpiece surface, make product surface more smooth and flat.

A lifting valve for an incinerator comprises a valve shell, a valve cover is installed at the top end of the valve shell, an air cylinder is arranged above the valve cover, the air cylinder is in transmission connection with a valve rod, a valve plate is installed at the bottom end of the valve rod, an air inlet is formed in the side wall of the valve shell, an air outlet is formed in the bottom wall of the valve shell, and a valve seat is arranged above the air outlet. A dustproof guide sleeve and a sealing material are arranged on the inner wall of the filler cylinder, the guide sleeve is slidably connected with the valve rod, and a supporting mechanism is arranged between the valve rod and the valve plate. The lifting valve is effectively prevented from being stuck, thermal deformation of the valve plate is reduced, and stable and efficient operation of the incinerator is guaranteed.

The application provides a modified PCR ABS material for table tennis shells and a preparation method thereof, which comprises the following components in parts by mass: low-flow PCR ABS resin: 30-40 parts, high-flow PCR ABS resin: 20-30 parts, large-particle-size ABS rubber powder: 10-15 parts, small-particle-size ABS rubber powder: 3-5 parts, SAN blend: 8-15 parts, and ABS new material: 0-20 parts; the low-flow PCR ABS resin has a melt index of 10-15 g / 10 min (220 DEG C x 10 kg); the high-flow PCR ABS resin has a melt index of 20-25 g / 10 min (220 DEG C x 10 kg); the large-particle-size ABS rubber powder has a particle size of 350-400 nm; and the small-particle-size ABS rubber powder has a particle size of 50-150 nm.

The utility model discloses an auxiliary fixture of a cutting machine for machining, which belongs to the technical field of mechanical cutting processing and comprises fixing frames, the fixing frames are welded and mounted on the left side and the right side of an external cutting machine, supporting rods are inserted and mounted in the two fixing frames, and workpiece pressing blocks are mounted at the lower ends of the supporting rods. The workpiece pressing block and the external workbench can clamp a workpiece, the workpiece pressing block comprises a sleeve, a connecting plate, a pressing plate, a limiting ring and a spring, the sleeve is installed on the upper wall of the connecting plate, and the sleeve is connected to the outer side of the supporting rod in a sleeving mode. The stable clamping of workpieces with different thicknesses and materials is guaranteed, the cutting precision is improved, meanwhile, the cooling groove in the pressing plate is connected with a cooling liquid circulating system, heat generated in the cutting process can be effectively taken away, the liquid outlet hole of the pressing plate corresponds to the cutting position, the cutting blade can be accurately cooled, thermal deformation is reduced, and the service life of the blade is prolonged.

The application provides an optimization design method of an internal permanent magnet synchronous electric spindle for a high-precision numerical control machine tool, and aims at the problem that a conventional electric spindle structure cannot perform real-time adjustment on axial pre-load and radial external load, and performs optimization design on the electric spindle structure from three aspects of high-speed ceramic ball hybrid bearing material, axial pre-load real-time compensation and radial external load real-time compensation. The application can improve dynamic characteristics of a rotor system and can actively inhibit shafting vibration.

This utility model discloses a three-section structure for the lower mold of a wheel hub mold, including: a lower mold for the wheel hub, a lower mold section body provided on the inner cavity of the lower mold through a mold base, a lower mold section water-cooling insert for the lower mold section body which is fixed with bolts for disassembly and replacement, and a lower mold section cold water insert for the lower mold section which is fixed with screws for disassembly and replacement. Through the independent water-cooling structure of the lower mold section cold water insert, the cooling efficiency of the original weak heat dissipation area can be enhanced, the local temperature can be reduced quickly, and the segmented water cooling makes the temperature distribution of each area more balanced, reducing the thermal deformation of the mold caused by temperature difference and improving the quality of wheel hub forming. The lower mold section two and three both adopt the insert structure fixed with bolts / screws. When a certain section or the easily corroded third section is worn or corroded, it is not necessary to disassemble or replace the entire lower mold, but only to replace the corresponding insert, which greatly reduces maintenance costs and downtime.

The application relates to the technical field of superconducting filters, in particular to a superconducting filter shielding box with a tuning structure, which comprises a bottom shell, a cover plate, a ceramic substrate, SMA joints and a bottom plate; the bottom shell is provided with openings at both ends, the bottom plate is installed at the opening at one end of the bottom shell, the ceramic substrate is adhered to the bottom plate through low-temperature-resistant conductive glue, two SMA joints are respectively fixed on the opposite two side walls of the bottom shell, one end of the SMA joint located in the bottom shell is welded with the ceramic substrate, the cover plate is arranged on the opening at the other end of the bottom shell, the cover plate is provided with two or more than two mounting holes which are uniformly distributed, tuning sleeves are arranged in the mounting holes, metal tuning columns are embedded in a part of all the tuning sleeves, and plastic tuning columns are embedded in the rest of all the tuning sleeves, so that the superconducting filter can normally work at low temperature, the performance is excellent and stable. Meanwhile, the superconducting filter shielding box with the manual tuning structure is convenient to debug and can be directly manually debugged, so that the work efficiency is greatly improved.

The invention discloses a die machining broaching device and broaching method, and belongs to the technical field of die machining. The die machining broaching device comprises a workbench, a first notch is formed in the side face of the workbench, a broaching drill is fixedly installed in a drill chuck, an overturning and adjusting assembly is arranged in the first notch, and a bottom removing assembly is arranged at the bottom of the first notch; an auxiliary discharging assembly is arranged between the bottom removing assembly and the overturning and adjusting assembly, and a clamping and pressing assembly is arranged at the bottom end of the mounting plate; the die plate can be turned over through the turning and adjusting assembly, and bidirectional reaming machining is carried out; cold air flow is evenly and finely blown out to the single side face after reaming through the bottom removing assembly, so that chippings are efficiently removed, meanwhile, cooling and heat dissipation are conducted on the die plate in the reaming process, after reaming machining of the die plate is completed, the arranged overturning and adjusting assembly rotates to a certain angle, an opening is made to be inclined downwards, and therefore the die plate is prevented from being damaged. And part of air flow in the bottom removing assembly is converted into one end blowing the mold plate through the auxiliary discharging assembly, so that the mold plate is rapidly taken out.

The application provides a preparation method of a cladding alloy layer on a concave-convex spherical surface matching surface and a support. The cladding alloy layer is formed by high-speed laser cladding on the concave-convex spherical surface matching surface to replace traditional stainless steel spherical surface cladding, so that the phenomenon of non-adhesion and cavity of stainless steel and a base material can be avoided. The preparation steps of the cladding alloy layer comprise the following steps: laser cladding of alloy powder on a matching surface on which the cladding alloy layer needs to be formed by a high-speed laser cladding device, so as to form the cladding alloy layer on the matching surface; then polishing the cladding alloy layer; during the laser cladding process, the flow rate of protective gas is controlled to be 2-20 L / min, the flow rate of powder feeding gas of the alloy powder is controlled to be 1-3 L / min, the power of laser is controlled to gradually increase from 20% to 90%, the powder feeding amount of the alloy powder is controlled to gradually increase from 1.5 g / min to 75 g / min; and the cladding height is controlled to be 15-25 mm.

The invention discloses a steel plate edge-sharing cutting method, which relates to the technical field of steel plate cutting, and comprises the following steps: planning a plurality of rectangular workpieces to be cut on the surface of a steel plate, arranging the rectangular workpieces according to columns and rows, and enabling the rectangular workpieces in adjacent columns and rows to share edges; an S-shaped continuous cutting path is adopted, a part of rectangular workpieces are cut at intervals in each column, and the adjacent rectangular workpieces in each column are alternately in a cut state and an uncut state; after interval cutting of the rectangular workpieces in the previous column is completed, the cutting head moves to the next column, and the S-shaped continuous cutting path continues to be adopted to cut the rectangular workpieces, corresponding to the positions of the uncut rectangular workpieces in the previous column, in the column; the process is repeated until the rectangular workpiece with all the edges on the S-shaped continuous cutting path is cut; and finally, the remaining rectangular workpieces connected with the leftover materials are cut. The cutting efficiency is improved, thermal deformation of the rectangular workpiece is effectively reduced, and the blanking quality of the rectangular workpiece is improved.

The invention belongs to the technical field of medical equipment, and particularly relates to a CT bulb tube anode device of a heat insulation type liquid metal bearing and a liquid filling system. Comprising an anode target disc, a heat insulation sleeve assembly, a rotor assembly, a fixed seat assembly and a liquid metal bearing assembly, one end of the liquid metal bearing assembly is sleeved with the heat insulation sleeve assembly, the other end of the liquid metal bearing assembly is sleeved with the fixing seat assembly, the rotor assembly is connected with the liquid metal bearing assembly and arranged on the fixing seat assembly in a sleeving mode, and the anode target disc is connected with the heat insulation sleeve assembly. The heat insulation sleeve structure is additionally arranged, so that the temperature transferred to the liquid metal bearing from the anode target disc is lower, the thermal deformation of a liquid metal bearing material is reduced, and the service life of the liquid metal bearing is indirectly prolonged. The CT bulb tube anode device is low in cost, long in service life and easy to assemble.

The utility model belongs to the technical field of roll shafts, and particularly relates to a self-lubricating anti-abrasion type roll shaft sleeve combined structure which comprises a roll shaft body. The interior of the roll shaft body is hollow; a connecting rod is fixedly connected to the interior of the roll shaft body; the middle part of the connecting rod is rotationally connected with a plurality of connecting rings; the connecting rings are distributed in a linear array state; a plurality of fan blades are fixedly connected to the middle part of the connecting ring; the fan blades are distributed in a circumferential array state; a plurality of heat dissipation holes are formed in the end part of the roll shaft body; the heat dissipation holes are distributed in a circumferential array state; the end part of the roll shaft body is fixedly connected with two connecting shafts; through the structure, air circulation can be effectively formed, dissipation of heat in the roll shaft body is accelerated, the temperature of all parts of the roll shaft body is more uniform, thermal deformation caused by local overheating of the roll shaft body is reduced, and the inner surface area of the roll shaft body is increased through the hollow structure in the roll shaft body; and the heat can be more sufficiently transferred into the air.

The utility model relates to the technical field of vehicle traction rod seat machining and positioning tools, and discloses a rail vehicle traction rod seat machining and positioning tool which comprises a bearing assembly, clamping assemblies, a positioning monitoring assembly and a cooling assembly. The positioning monitoring assembly is installed above the bearing assembly, the cooling assembly is installed at the rear end of the upper portion of the bearing assembly, and the clamping assembly and the positioning monitoring assembly are arranged, so that alignment and fixing of workpieces can be rapidly achieved, the manual adjustment time is shortened, it is guaranteed that the workpieces cannot move or shake in the machining process, and the machining efficiency is improved. In addition, the position of the workpiece can be monitored in real time in the machining process, deviation can be found and corrected in time, and the machining precision is ensured; and the cooling assembly is arranged, the temperature of the machining area can be effectively controlled, thermal deformation is reduced, and the machining precision is ensured.

The utility model provides a kind of foamed ceramic composite machine bed of integrated cooling runner, including foamed ceramic pedestal, reinforcing rib, workbench, the inside of foamed ceramic pedestal is equipped with the hole structure of net-like distribution, hole structure includes rib hole and runner hole, rib hole is used to fill reinforcing rib, runner hole constitutes cooling medium passage;Runner hole inner wall is equipped with sealing layer, runner hole is equipped with medium inlet and medium outlet on foamed ceramic pedestal side wall;Reinforcing rib is filled in the inner wall of rib hole, and is integrated with foamed ceramic pedestal solidification, form built-in reinforcing framework;Workbench is fixedly arranged on the upper surface of foamed ceramic pedestal, and workbench is integrally connected with reinforcing rib at the orifice of rib hole.This foamed ceramic composite machine bed of integrated cooling runner has active temperature control capability, and has the advantages of lightweight, strong vibration absorption and damping capacity, high structural strength, good dimensional stability.

This utility model relates to the field of machining technology, and in particular to a punching fixture for preventing deformation of thin-walled pipe fittings. This utility model provides such a punching fixture for preventing deformation of thin-walled pipe fittings, including a turntable, fixed frames, a cylinder, a slider, fixed nuts, and a flexible clamping plate. Several fixed frames are mounted on the turntable, and the cylinder is mounted on each fixed frame. Several grooves are formed on the turntable, and a slider is slidably mounted within each groove. The slider is connected to the piston rod of the cylinder, and several fixed nuts are mounted on the slider. A flexible clamping plate is mounted on each fixed nut. This utility model, by activating the cylinder, causes the piston rod to extend and retract, driving the slider to reciprocate within the groove, which in turn drives the flexible clamping plate to expand or contract radially, thereby achieving the effect of tightening or loosening the inner wall of the pipe fitting, resulting in uniform clamping and convenient loading and unloading.

This invention relates to the field of chemical mechanical polishing (CMP) pad technology, specifically to a highly hydrophilic and wear-resistant CMP polishing pad, its preparation method, and its application. The invention uses cyanosiloxane monomers as raw materials, preparing highly active carboxylate silsesquioxane powder through one-step alkaline hydrolysis, and achieving nanoscale uniform dispersion of this powder in polyurethane. After pre-treating the base fabric with an acid-base oscillating impregnation agent, the nanoscale uniformly dispersed slurry is coated onto the base fabric, and then solidified to obtain the target product. This invention solves the technical problems of difficulty in balancing hydrophilicity and wear resistance, and poor polishing uniformity in existing hydrophilic modification polishing pads. The polishing pad produced is used for wafer polishing, exhibiting less than 3% intra-wafer non-uniformity, fewer surface defects, and extended service life. The process of this invention is fully compatible with existing wet production lines for polyurethane polishing pads, requiring no additional equipment. The process is simplified, batch stability is strong, and industrial mass production is possible, adapting to the high-precision, low-defect polishing requirements of advanced semiconductor processes below 14nm.

The utility model provides a kind of battery box, including bottom plate and multiple frames connected with each other, and bottom plate and multiple frames are enclosed to form the installation cavity for loading battery;At least one frame includes side plate and at least one first support rib, first support rib and side plate constitute integrated structure, side plate includes first inner cavity, first support rib is located in first inner cavity, side plate is also provided with protective layer to the side of installation cavity, protective layer and side plate constitute integrated structure, the side of installation cavity of protective layer is welded and connected with bottom plate, and second inner cavity is provided in protective layer.The technical scheme of the utility model can reduce the thermal deformation generated by side plate, reduce the influence of thermal deformation on the connection strength and service life of side plate.