705 results about "Sandpaper" patented technology

The invention discloses a photocatalytic purification diatomite functional decorative board and a preparation method thereof, and relates to the technical field of diatomite decorative boards. The technical solution is to provide a diatomite substrate, and polish the surface with sandpaper; uniformly coat a layer of heat-sensitive epoxy resin adhesive on the diatomite substrate; lay a carbon fiber mesh on the uncured heat-sensitive epoxy resin layer, and then spread TiO2 / paraffin / alumina composite particles, and compact them with a roller, and accelerate curing with an oven; and coat the board with UV curing resin as a weather-resistant protective layer, and use a UV lamp to cure. The invention significantly improves the distribution and fixation of the composite particles of the diatomite board by applying the carbon fiber mesh and the heat-sensitive epoxy resin adhesive, and enhances the mechanical strength and photocatalytic efficiency. The carbon fiber mesh and alumina in the structure increase the wear resistance, optimize the TiO2 distribution, and improve the air purification efficiency and thermal stability.

The invention relates to furniture plate laser cutting equipment and a cutting method, and belongs to the technical field of laser cutting machines.The furniture plate laser cutting equipment comprises a machining table, a cross beam is arranged on the machining table, a laser head is arranged on the cross beam, and the laser head is slidably arranged on the cross beam and slides in the length direction of the cross beam; the driving device is used for driving the cross beam to slide and driving the laser head to slide to cut a plate; a protective cover is arranged on the laser head, the protective cover is made of a transparent material, a shielding piece is arranged in the protective cover, and the shielding piece is used for forming a shielding barrier in the protective cover to weaken the light intensity; the protective cover is arranged in the laser head body in a sliding mode, the protective cover slides in the vertical direction and is contained in the laser head body, polishing abrasive paper is arranged on the bottom wall of the protective cover and the side wall close to the bottom wall, the protective cover is rotationally arranged in the laser head body, and a first driving piece used for driving the protective cover to rotate is arranged in the laser head body. The laser cutting device has the effect of improving the laser cutting safety.

The utility model belongs to the technical field of cylindrical workpiece polishing, and mainly relates to a cambered surface polishing device which is characterized by comprising a support frame, abrasive paper, an arc-shaped mounting plate and a driving piece, the arc-shaped mounting plate is provided with an inner arc surface matched with the outer circumferential surface of a cylindrical workpiece to be polished; the abrasive paper is adhered to the inner arc surface and is used for polishing the outer circumferential surface of the cylindrical workpiece; the arc-shaped mounting plate is assembled on the supporting frame in a swinging mode around the central axis of the cylindrical workpiece where the arc-shaped mounting plate is located. The driving part is fixed to the supporting frame and is in transmission connection with the arc-shaped mounting plate so as to drive the arc-shaped mounting plate to swing back and forth around the central axis of the cylindrical workpiece. The outer circumferential surface of the cylindrical workpiece is in full contact with the abrasive paper on the arc-shaped mounting plate, the arc-shaped mounting plate swings up and down to be in contact friction with the self-rotating cylindrical workpiece, the contact area is larger, the grinding effect is better, and the grinding efficiency is higher.

The present invention relates to the field of coated abrasive technology, specifically to anti-clogging ceramic sandpaper and its preparation method. The technical key features are as follows: from bottom to top, it comprises: latex paper, a base glue, abrasive, a double glue, and an anti-clogging coating. The anti-clogging coating is prepared from the following components, calculated by weight: 30-50 parts aqueous emulsion, 10-15 parts graded filler, 3-5 parts dispersant, 2-3 parts water-soluble curing agent, and 60-70 parts water. The graded filler is ceramic corundum particles with the following gradation: particle size R < 250nm, 1-3%; 250≤R < 350nm, 65-75%; 350nm≤R < 450nm, 15-19%; 450≤R < 550nm, 3-5%. The anti-clogging ceramic sandpaper and its preparation method provided by the present invention significantly enhance the anti-clogging effect of the anti-clogging coating while effectively improving the sharpness and self-sharpening properties of the sandpaper surface.

The low-temperature welding method comprises the steps that firstly, abrasive paper is adopted for polishing the surfaces of a copper substrate and an aluminum substrate, then a welding clamp is adopted for fixing the aluminum substrate, then an interconnection interface of the aluminum substrate is filled with proper Sn0. 3Ag0. 7Cu alloy powder, the aluminum substrate is placed on a constant-temperature table to be heated after being covered with the copper substrate, and the copper substrate and the aluminum substrate are welded at the same time. And simultaneously applying ultrasound and pressure to the copper substrate and the aluminum substrate, and continuously keeping the temperature and the pressure after the ultrasound is stopped until the experiment is finished. The prepared connector is free of zinc element, the copper-aluminum connector with the (Sn) + Al2Cu + AlCu ternary eutectic is formed and has good plasticity and toughness, the welding method is easy to operate, the welding temperature is low, the welding time is short, the production cost is reduced, and the production efficiency and the product reliability are greatly improved.

A flatness control structure for a drywall sander, comprising: a device body, wherein the bottom of the device body is equipped with a rotating device, a housing is arranged below the device body, a sanding component is arranged inside the housing, the sanding component comprises a sanding piece, the bottom of sanding piece is connected to a sanding disc, and the bottom of sanding disc is connected to sandpaper, a threaded bolt is arranged between the sanding piece and the housing, a fixing component is arranged inside the housing, and an installation component is arranged inside the housing. The sander replaces the bristle sections with a wear-resistant strip which is less likely to deform when in contact with the sanding surface. When force is applied, the sander can be firmly fixed on the sanding surface, ensuring stability of the entire sander, thereby improving the flatness of the sanding surface.

The invention discloses sofa board surface processing equipment, and relates to the technical field of board surface processing. The device comprises a machining table, linear sliding rail modules are installed on the front face and the back face of the machining table, a grinding assembly is fixedly installed between the two linear sliding rail modules, the grinding assembly is located above the machining table, and the grinding assembly comprises a grinding cover fixedly installed between the two linear sliding rail modules; a negative pressure hole is formed in the inner wall of the polishing cover, and the negative pressure hole and the adsorption hole are connected with external negative pressure equipment through a negative pressure connecting pipe. Through the arrangement of the abrasive paper mounting roller, abrasive paper can be quickly unloaded, the abrasive paper is tightly adsorbed on the abrasive paper mounting roller through negative pressure along with rotation of the abrasive paper mounting roller in the replacement cover, quick replacement of long abrasive paper is completed, abrasive paper with different granularities can be replaced according to needs, the equipment adaptability is high, manual operation replacement is not needed, and the automation degree is high.

The utility model relates to the technical field of cold headers, and provides a cold header for anchor bolt production, which comprises a base. According to the straightening device, raw materials are placed between the first straightening wheel and the second straightening wheel, the motor is started to drive the first gear to rotate so as to drive the auxiliary gear to rotate in an engaged mode, the auxiliary gear drives the third gear to rotate in an engaged mode, and the first gear and the third gear drive the connecting shaft to rotate so as to drive the second straightening wheel to rotate. The raw materials are driven to move through rotation of the second straightening wheels, the raw materials are conveyed, the raw materials are straightened in the raw material output process through arrangement of the first straightening wheels and the second straightening wheels, the raw materials are polished in the raw material conveying and moving process through arrangement of abrasive paper, and pretreatment of the raw materials in the feeding process is achieved; by means of the technical scheme, the problem that in the prior art, the quality of workpieces can be affected due to bending and rusting of raw materials is solved.

The invention relates to the technical field of electric vehicle frame production, in particular to laser cutting equipment for electric vehicle frame production, which comprises a machine table, a pushing mechanism, a laser cutting machine and a discharging mechanism, according to the laser cutting equipment for electric vehicle frame production, by arranging the discharging mechanism, an inner supporting rod is driven to reciprocate, relative friction motion is formed between a bag body abrasive paper layer and a cutting area, high-temperature molten slag generated in the cutting process is removed in real time, and the situation that the high-temperature molten slag is condensed and solidified on the inner wall of a pipe fitting to form hard hanging slag is prevented; meanwhile, finishing machining is carried out on the cutting seam, and the surface roughness is controlled within Ra3.2 microns; in addition, a slag blocking area can be constructed through the annular sealing effect of the bag body, and splashing and diffusion of slag in the inner cavity of the pipe fitting are effectively restrained.

The utility model discloses a mobile phone tempered film wear resistance detection device, which relates to the technical field of tempered film detection and comprises a supporting seat, a first electric push rod arranged on the supporting seat, a fixing plate fixedly mounted at the output end of the first electric push rod, a supporting plate arranged above the fixing plate, and a first carrier plate arranged above the supporting plate. A plurality of elastic assemblies are arranged between the supporting plate and the first carrying plate. The two first bolts on the same auxiliary plate are screwed through a wrench so that the two first bolts can fix abrasive paper attached to the surfaces of the carrying blocks, the multiple carrying blocks are arranged in a linear mode and can bear abrasive paper of different mesh numbers, and the mobile phone tempered film can be pushed to move upwards through the first electric push rod; the pressure between the mobile phone tempered film and the abrasive paper can be adjusted by means of the elastic assembly, so that the abrasive paper can generate friction of different degrees with the mobile phone tempered film under the traction of the two second electric push rods, and the use state of the mobile phone tempered film in a real environment is better simulated.

The invention discloses a preparation method of a novel mixed metal oxide coating titanium electrode, and relates to the technical field of electrode preparation, the method comprises the following specific steps: titanium substrate pretreatment: a titanium plate is sequentially subjected to gradient polishing with 120-800-mesh abrasive paper, the polished titanium substrate is subjected to hydrochloric acid solution etching, argon plasma surface activation and drying treatment, and a titanium substrate is obtained; obtaining a clean substrate surface with proper roughness; through the low-temperature plasma treatment, pulsed bias magnetron sputtering and laser-induced atomic layer deposition (LA-ALD) combined technology, the binding force of the coating and the titanium substrate is remarkably improved, high-energy particles are used for bombarding the surface of the titanium substrate in the low-temperature plasma treatment, residual impurities are effectively removed, the surface roughness and active sites are increased, and the surface hardness of the titanium substrate is improved. In the pulsed bias magnetron sputtering process, the surface of the substrate is further cleaned through periodic ion bombardment, atomic diffusion and mixing between the coating and the substrate are promoted, a transition layer structure is formed, and therefore the binding force is greatly enhanced.

The invention discloses a combined type wind power blade rear edge mold closing foam machining tool, and relates to the technical field of grinding equipment. Comprising a grinding machine control main body, a grinding driving mechanism is arranged at the left side end of the grinding machine control main body, a rotating plate is arranged at the lower end of the grinding driving mechanism, grinding abrasive paper is arranged below the rotating plate, a protective dust collection mechanism is arranged on the outer side of the rotating plate, and an auxiliary frame is arranged on the side wall of the grinding machine control main body. The closed grinding space is constructed through the protective dust collection mechanism, the elastic cover and the abutting ring are matched to seal the grinding area, the dust collection opening, the dust collection frame and the dust collection pipe are matched to form a negative pressure dust collection channel, foam chippings generated during grinding can be rapidly collected, and meanwhile the situation that the chippings are attached to the surface of a mold or a blade to affect the mold closing precision and the bonding quality is prevented. And the sweeping mechanism is matched with the vibration block and the supporting spring, and vibrates after the vibration block collides with the sweeping rod, so that the swept chippings are shaken off and are extracted from the dust suction opening, and the chipping cleaning efficiency is further improved.

The trimming device for air conditioner plastic part machining comprises a supporting box body and a driving motor in the supporting box body, the top of the supporting box body is fixedly connected with a workbench, the output end of the driving motor is in threaded connection with an abrasive paper replaceable grinding mechanism through a bolt head, and the abrasive paper replaceable grinding mechanism comprises an outer cylinder assembly and an inner cylinder assembly. The outer cylinder assembly is connected with the driving motor and extends to the position above the workbench, the outer cylinder assembly comprises an outer cylinder, a through groove is formed in the back face of the outer cylinder, limiting teeth are slidably connected between the top and the bottom of the inner wall of the through groove, and a plurality of limiting teeth are fixedly connected to the left sides of the limiting teeth at equal intervals. According to the trimming device for air conditioner plastic part machining, when abrasive paper is seriously abraded, the abrasive paper can be rapidly replaced through the abrasive paper replacing assembly, and the abrasive paper on the abrasive paper roll can be rapidly supplemented through the design of the outer cylinder assembly after being used, so that the practicability of the device during use is improved.

The invention relates to a fluorine-free transparent self-cleaning solid lubricating coating and a preparation method thereof.The solid lubricating coating is formed by coating a substrate with wax-based suspension liquid and curing the wax-based suspension liquid, the wax-based suspension liquid is prepared by dispersing wax micro-powder, a hydrophobic adhesive and hydrophilic nano-silicon dioxide in a solvent, the wax micro-powder provides roughness and hydrophobicity, and the hydrophobic adhesive and the hydrophilic nano-silicon dioxide are dispersed in the solvent; the hardness of the coating and a certain water contact angle are increased by hydrophilic nano silicon dioxide, so that the coating has good optical transparency, excellent self-cleaning performance, hydrophobicity, stability and durability, preferably, the transparency can reach 99%, the hydrophobic performance can still be kept after abrasive paper abrasion, gauze abrasion, sand impact, water impact and acid rain impact, and the service life of the coating is prolonged. Meanwhile, the preparation method is simple and environment-friendly, fluorine and VOC emission is avoided, the addition amount of the wax is not limited by preparation, the wax can be flexibly adjusted, the wax can be suitable for multiple fields such as solar panels, building outer walls and automobile surfaces, the power loss of the photovoltaic panel subjected to self-cleaning preferably can be smaller than or equal to 1%, and wide commercialized application prospects are achieved.

The invention discloses a corrosion method of an Al Si 10Mg alloy grain boundary, which mainly comprises the following steps of: 1, preparing a corrosion liquid which comprises the following components: 150mL of NaOH, 8-10g of NaOH and 3-5g of NaOH; 2, embedding an Al Si 10Mg sample; thirdly, the embedded samples are sequentially polished with abrasive paper from 400 meshes to 7000 meshes; 4, roughly polishing the ground sample; 5, smearing a surfactant on the sample subjected to rough polishing, and then carrying out fine polishing; 6, cleaning the polished sample with industrial alcohol; 7, heating the prepared corrosive liquid to 60-80 DEG C, and corroding the sample for 40-60 seconds; 8, cleaning the sample with industrial alcohol after corrosion patterns appear on the surface of the sample; and 9, carrying out drying treatment. After the method is used for corroding the Al Si 10Mg alloy, the crystal boundary of the alloy can be clearly observed, and the method is low in equipment requirement, simple in operation step, capable of saving cost, good in stability and suitable for researching the grain morphology, the grain size, the microstructure performance and the like of the Al S i 10Mg alloy.

The invention relates to the technical field of copper-aluminum bars, in particular to a copper-aluminum polymer diffusion hybrid welding method which is characterized by comprising the following steps: S1, welding nickel sheets with bare copper: compounding the nickel sheets with the thickness of 0.1-0.3 mm on the welding surfaces of the copper bars; s2, nickel sheet polishing: mechanically polishing the nickel sheet until the surface roughness Ra is less than or equal to 0.8 mu m; s3, the aluminum row is polished, specifically, the welding face of the aluminum row is polished in a one-way mode through abrasive paper of 800-2000 meshes till the roughness Ra is smaller than or equal to 1.0 micron; s4, copper and aluminum composite welding is conducted, specifically, the copper bar with the polished nickel piece and the polished aluminum bar are composited through polymer diffusion welding, the welding temperature is 400-500 DEG C, the pressure is 10-20 MPa, and heat preservation is conducted for 30-60 minutes; the nickel sheet with the proper thickness is compounded on the welding surface of the copper bar, the binding force of a welding interface is enhanced, then the nickel sheet is subjected to precise mechanical polishing, it is ensured that the surface roughness of the nickel sheet reaches the extremely low level, the welding surface of the aluminum bar is subjected to fine grinding treatment, and the adaptability of the welding surface is improved; and tight combination of the copper bar and the aluminum bar is achieved at specific welding temperature, pressure and heat preservation time, and practicability is high.

The invention relates to the field of wear resistance testing, in particular to an automatic testing method and testing equipment for wear resistance of a mobile phone protective film. According to the method, firstly, in the process that a polishing wheel rotates at different rotating speeds, abrasive paper of different mesh numbers and types is used for polishing the mobile phone protective film, and the target abrasive paper is combined with the mesh number of the target abrasive paper, rotating speed data of the target abrasive paper during polishing of the mobile phone protective film every time and a surface image of the mobile phone protective film after polishing of the target abrasive paper every time; the grinding effect value of the target abrasive paper during grinding of the mobile phone protective film each time is obtained according to the target abrasive paper and the surface distance between the mobile phone protective film and the grinding wheel after grinding of the target abrasive paper each time, and a sequence formed by the grinding effect values of all the abrasive paper during grinding of the mobile phone protective film each time is subjected to time sequence decomposition; and evaluating the wear resistance of the mobile phone protective film according to the data change of the trend term and the data distribution level of the residual term obtained through decomposition. According to the invention, the wear resistance of the mobile phone protective film can be evaluated more comprehensively and accurately.

The utility model discloses a sandpaper collection rack structure for automatic sandpaper cutting, and the utility model relates to the technical field of sandpaper collection racks. The sandpaper collection rack structure for automatic sandpaper cutting comprises: a mounting rack, the middle of which is rotatably connected to a support rod, and a rotating assembly driving the support rod to rotate is installed on the mounting rack; a mounting plate fixed above the mounting rack, and collecting assemblies for collecting sandpaper are installed at both ends of the mounting plate; the application arranges collecting assemblies at both ends of the mounting plate and arranges rotating assemblies on the mounting rack, so that when the collection rack structure is installed at the discharge end of the sandpaper cutting machine, the collection and packaging work can be carried out simultaneously, and when one side of the collection assembly is collecting, the other side can package the collected sandpaper, effectively improving the work efficiency of sandpaper collection.

The invention provides a polishing treatment method for an LCD target material. The polishing treatment method comprises the following steps: providing a target material to be treated; the surface of the to-be-treated target material is rotationally polished through first abrasive paper, and a polished surface is obtained; second abrasive paper is used for conducting grain straightening on the polished surface; the mesh number of the first abrasive paper is smaller than that of the second abrasive paper. The uniformity of the outer surface of the target material is guaranteed, meanwhile, manual operation is reduced, and the production efficiency is improved.

The invention belongs to the technical field of abrasive paper production, and particularly relates to an automatic production and packaging system and method for environment-friendly water-based green abrasive paper. The material belt traction assembly is used for continuously conveying the material belt, the upper punching assembly and the lower punching assembly are used for punching the material grinding layer of the material belt, the first material grinding part and the second material grinding part which can be clamped with each other are obtained correspondingly, and the obtained first material grinding part and the obtained second material grinding part are transferred to the first abrasive paper base belt and the second abrasive paper base belt correspondingly; and then the two pieces of abrasive paper are laminated and compounded through the compounding and slitting assembly, and a self-protection packaged slitting product is obtained through slitting. The slitting product with the self-protection packaging function is formed by clamping the two pieces of abrasive paper, the abrasive paper base bands of the two pieces of abrasive paper serve as protective structures, a protective die does not need to be additionally sleeved on the two pieces of abrasive paper, self-protection packaging can be achieved through slitting after production, packaging materials can be saved, the environment can be protected, and the situations that the packaging film is damaged and abrasive materials are abraded are effectively avoided.

The invention discloses a high-alloy steel nitriding-laser quenching composite surface strengthening method which comprises the following steps: sequentially polishing the surface of high-alloy steel by using 240-mesh waterproof abrasive paper and 2000-mesh waterproof abrasive paper, then sequentially putting the high-alloy steel into ethanol and acetone for ultrasonic cleaning, and nitriding the pretreated high-alloy steel to form a nitriding layer; and cooling to room temperature along with the furnace under the atmosphere of nitrogen or ammonia gas to obtain the high alloy steel containing the nitriding layer. And blackening treatment is conducted in the atmosphere of argon or nitrogen, then laser quenching treatment is conducted, and high alloy steel surface strengthening treatment is completed. According to the nitriding-laser quenching composite surface strengthening process, the problems that a high alloy steel nitriding layer is shallow (smaller than 0.2 mm), interface brittleness is achieved, and the retained austenite content is high (larger than 20%) are effectively solved, the total treatment time is shorter than or equal to 16 h, the surface hardness of a modified layer is larger than or equal to 600 HV0.1, the thickness of the modified layer is larger than or equal to 1.5 mm, and the nitriding-laser quenching composite surface strengthening process is suitable for preparing key components such as aviation gears and heavy-duty bearings.

The invention discloses a chip processing method, which comprises the steps that a chip is provided, a top metal layer of the chip comprises a first region and a second region, a second barrier layer, a metal wiring layer and a first barrier layer are sequentially stacked on the first region, and an oxide layer and a passivation layer are sequentially stacked on the first barrier layer and the second region; thinning or removing the passivation layer through etching; grinding the chip through abrasive paper to remove the oxide layer and the first barrier layer in the first area, thinning the metal wiring layer and the oxide layer in the second area, and stopping grinding until part of the second barrier layer is exposed out of the edge of the chip; grinding a region, which does not expose the second barrier layer, in the first region through an eraser to remove a part of the metal wiring layer; removing the residual metal wiring layer through an alkaline solution; and etching the second barrier layer. According to the method, the top metal layer can be completely removed, the lower metal layer is prevented from being damaged when the top metal layer is removed, and it is guaranteed that the secondary top layer is complete and flat.

The invention discloses an ultra-precision polishing method for a thermoelectric material. The ultra-precision polishing method comprises the steps that S1, mechanical grinding and rough polishing are conducted on a thermoelectric material block through abrasive paper; wherein the abrasive paper sequentially uses metallographic abrasive paper with the abrasive particle mesh number from small to large; s2, diamond polishing paste or polishing liquid, CeO2 polishing liquid and Al2O3 polishing paste or polishing liquid are used as grinding materials, and mechanical polishing and fine polishing are carried out on the thermoelectric material block after mechanical grinding and rough polishing on a polishing machine; and S3, an alkaline SiO2 polishing solution or a water-based diamond polishing solution is used as a polishing medium, the thermoelectric material block subjected to mechanical polishing is subjected to repeated fine polishing and mechanochemical polishing on a polishing machine, and the thermoelectric material subjected to ultra-precision polishing is obtained. The surface roughness of the thermoelectric material obtained by the method does not exceed 1nm.

The utility model discloses a machining device for a guide fillet of a sealing structure, which comprises a grinding head, abrasive paper and a positioning shaft, and the grinding head is provided with a positioning cylinder and a rotary grinding surface which is formed by taking an inner concave arc R as a contour edge and taking the axis of the grinding head as a rotating shaft. Before a guide fillet is machined, abrasive paper is marked along the contour of a cutting sample plate and cut, then the abrasive paper is pasted to a grinding head through glue, a positioning shaft is inserted into a pipe joint, the grinding head is clamped through a handheld electric drill, a positioning cylinder is inserted into a positioning round hole of the positioning shaft, and the grinding head is pressed to a to-be-machined position for grinding; and finally, metallographic abrasive paper is used for polishing the ground round corner, and alcohol is used for cleaning the ground round corner. By adopting the guide fillet processing device, the problems of difficult repair and low repair qualification rate caused by missing processing of the guide fillet can be solved.

The invention discloses a preparation method and application of a flexible pressure sensor of an Mxene-based low-dimensional inorganic / organic hybrid material. The whole flexible pressure sensor of the Mxene-based low-dimensional inorganic / organic hybrid material is of a sandwich structure and sequentially comprises a protective layer, a modified microstructure layer, a composite sensitive layer, an electrode layer, a modified microstructure layer and a protective layer from top to bottom. A conductive silver paste adhesion interdigital electrode is used as a transmission electrode layer, a cashmere fabric compounded by Mxene and silver nanowires is used as a sensitive layer, abrasive paper is used as a template, PDMS is used as a base material, a modified microstructure layer is obtained through two times of copying, an insulating soft material such as PDMS or resin is selected as a protective layer, and the flexible pressure sensor is obtained through packaging. The preparation method of the flexible pressure sensor of the Mxene-based low-dimensional inorganic / organic hybrid material is simple in processing technology, low in product cost, good in compression characteristic and high in sensitivity, detection of small pressure such as swallowing and pulse of a human body and detection of large pressure such as foot force in different postures can be achieved, and the flexible pressure sensor is suitable for large-scale popularization and application. The method has great application potential in the fields of medical treatment, sports, health protection and the like.

A bench step device is disclosed that provides a bench step for locker rooms, retail stores, and other areas where people take off and put on footwear. The bench step device comprises a body component that is configured in a rectangular, table-like shape with a pair of legs positioned at the corners of the opposing sides. The body component also comprises a pair of platform steps that slide out from the opposing sides. The platform steps can be expanded and retracted via manual or automated means and provide a place for users to tie their shoes, roller skates, ice skates, boots, or other footwear. Each platform step can be secured in place via a sliding hinge. Further, each platform step has a sandpaper or other grit-style surface for traction to ensure that the user does not slip while reaching down.

The invention discloses a high-temperature-resistant metal honeycomb equipment forming method which comprises the following steps: S1, performing blanking calculation, extracting a single corrugated plate in a metal honeycomb core body, and unfolding the single corrugated plate according to an equal length principle so as to determine size parameters of a pre-connected area and a to-be-stretched area; s2, chemical oil removal is conducted, specifically, the surface of the metal foil is treated, stains and oxide films on the surface of the metal foil are removed, the subsequent resistance welding strength is improved, and the situation of welding breakage during stretching is avoided; s3, surface activation is conducted, specifically, a mechanical-chemical synergistic process is adopted, silicon carbide abrasive paper is adopted for polishing the metal foil, the surface roughness Ra value of the metal foil is reduced, the specific surface area is increased, the contact angle is reduced, and finally drying treatment is conducted; and S4, material cutting is conducted, specifically, an ultra-short pulse laser cutting technology is adopted for metal foil machining, and the allowance of 10 mm is reserved so that the foil can be fixed. The stretching parameters can be flexibly adjusted according to different curvature requirements, and the preparation problem of the honeycomb core in a complex shape is successfully solved.

The invention discloses a bearing balance block grinding tool and method, and belongs to the technical field of bearing balance block machining. The technical problems that in the horizontal grinding machining process of an existing balance block with the contact face being an arc spherical face, due to the fact that the balance block cannot serve as an alignment reference, deviation is prone to occurring in the machining process, and the machining precision is insufficient are solved. The base comprises a plurality of first bosses evenly distributed in the horizontal circumferential direction, the abrasive paper is pasted to the top faces of the first bosses, the clamping block is in a cylindrical pipe shape, a conical hole is formed in the lower portion of the inner wall of the clamping block, four sets of positioning grooves are evenly formed in the upper end of the clamping block in the circumferential direction, and each set of positioning grooves is provided with two adjacent notches. A compression spring is sleeved on a second boss in the middle of the positioning groove, the upper portion of the rotating shaft is cylindrical, four groups of double-fork type positioning teeth are evenly arranged at the bottom of the rotating shaft in the circumferential direction, and the positioning teeth are installed in a notch of the positioning groove in a sliding mode in the vertical direction. And the machining precision is improved. The grinding device is used for grinding the balance block for the bearing.

The invention discloses a nondestructive testing method for the thickness of oxide scale on the surface of thin-gauge strip steel, and belongs to the technical field of metal material surface detection.The nondestructive testing method comprises the steps that S1, plate shearing and carbon powder composite sample preparation are conducted, specifically, firstly, the thin-gauge strip steel is cut through a plate shearing machine to obtain a strip steel sample, then the strip steel sample and carbon powder are mixed, and finally hot inlaying treatment is conducted; s2, multi-angle progressive grinding and polishing are conducted, and in the grinding and polishing process, the sample is rotated by 20 + / -5 degrees every time the abrasive paper is replaced; s3, gray scale and depth-of-field two-parameter analysis: firstly, based on the gray scale difference among the carbon powder, the strip steel substrate and the oxide layer, carrying out regional distinguishing on the carbon powder, the strip steel substrate and the oxide layer; acquiring depth-of-field parameters for different areas; and finally, obtaining the thickness of the oxide layer according to the difference value of the three depth-of-field parameters. Through the synergistic effect of the sample preparation technology, the grinding and polishing technology and two-parameter analysis, the detection precision is improved, and meanwhile the detection efficiency is improved.

This disclosure provides a polishing apparatus, belonging to the field of machining. The polishing apparatus includes a fixed base, a polishing assembly, and at least one pair of guide assemblies. The polishing assembly includes sandpaper and two drive rollers, which are arranged in parallel and rotatably connected to the fixed base. The sandpaper is wound around the two drive rollers at both ends along its length, and has a polishing surface for polishing parts. Each of the at least one pair of guide assemblies is connected to the fixed base. Each pair of guide assemblies is symmetrically arranged on opposite sides of the sandpaper in the width direction between the two drive rollers, and each pair of guide assemblies is configured to bend the opposite sides of the sandpaper in the width direction between the two drive rollers toward the opposite side of the polishing surface. This disclosure can improve the polishing effect of parts.