12results about How to "Uniform roughness" patented technology

The invention relates to the technical field of metal surface treatment, in particular to a laser scraping process applied to a metal surface, which is characterized in that a laser beam is emitted by a laser head of a laser system to act on the metal surface to be treated and is used for simultaneously cleaning and texturing the metal surface; the laser device for realizing the process is simple in structure, can be designed in a miniaturized manner, is better in applicability, and has more obvious advantages especially in complex application scenes such as bridge steel structures; before metal welding, welding while cleaning can be realized by using the laser scraping process, so that the construction efficiency is greatly improved, especially in bridge welding operation needing quick response and high precision; before the metal is painted, the laser scraping process is used, so that not only can anti-corrosion paint and a corrosion layer on the surface be thoroughly removed, but also uniform roughness can be formed on the surface, and an ideal base material strip is provided for coating.

The invention belongs to the field of polishing, and discloses a liquid metal grinding and polishing disc preparation device and a preparation method thereof.The liquid metal grinding and polishing disc preparation device comprises an electromagnetic stirring unit, a conveying unit and a forming unit, the electromagnetic stirring unit mixes and stirs a liquid metal solution and abrasive particles, and the conveying unit conveys the mixed and stirred liquid metal solution and abrasive particles to the forming unit; the forming unit comprises a mold, an electrode and a first electromagnetic coil are arranged on the mold, the mold provides a cavity for a mixed solution of a liquid metal solution and abrasive particles, the electrode is electrified to improve the current density of the mixed solution, and the first electromagnetic coil is electrified to generate an alternating magnetic field acting on the mixed solution. And the whole mold is filled with the mixed liquid under the common influence of the electric field force and the Lorentz force, and finally the mixed liquid is solidified to form the liquid metal grinding and polishing disc. When the device is used for manufacturing the liquid metal grinding and polishing disc, even if the viscosity of the liquid metal solution is high, contact is not needed in the whole manufacturing process, the purity of the liquid metal and the abrasive particle solution is guaranteed, and adhesion waste is prevented.

The invention discloses a preparation method of a high-uniformity low-hydrogen-release high-solderability gold coating on the surface of an aluminum-based silicon carbide material. The preparation method comprises the following steps: carrying out oil removal and chemical coarsening on the surface of aluminum-based silicon carbide; carrying out silanization treatment on the surface of the aluminum-based silicon carbide; performing palladium-free activation on the surface of the aluminum-based silicon carbide; sequentially carrying out primary nickel plating, primary hydrogen removal and sand blasting treatment on the surface of the aluminum-based silicon carbide; carrying out secondary nickel plating on the surface of the aluminum-based silicon carbide; gold plating is conducted on the surface of the aluminum-based silicon carbide, and a gold plating layer is formed on the surface of the aluminum-based silicon carbide; and carrying out secondary dehydrogenation on the gold plating layer on the surface of the aluminum-based silicon carbide. According to the method, uniform active points on the surface of the aluminum-based silicon carbide are prepared, it is guaranteed that the follow-up plating layer is uniform in crystallization and high in adhesive force, plating layer hydrogen removal is conducted through secondary vacuum heat treatment, and preparation of the low-hydrogen-release high-weldability gold plating layer on the surface of the aluminum-based silicon carbide material is achieved.

The present invention provides a semiconductor silicon wafer thinning etching solution, a preparation method and application thereof, wherein the semiconductor silicon wafer thinning etching solution comprises the following components in weight proportion: 10-15 parts of hydrofluoric acid; 5-10 parts of nitric acid; 2-4 parts of a negatively charged complexing agent; 0.1-1 parts of a positively charged organosilicon surfactant; 15-30 parts of ultrapure water, wherein the positively charged organosilicon surfactant is a pyridine-modified organosilicon surfactant. The present invention also discloses a preparation method and application of the semiconductor silicon wafer thinning etching solution. The semiconductor silicon wafer thinning etching solution of the present invention has the characteristics of fast etching rate, moderate and uniform surface roughness of the semiconductor silicon wafer after etching, and strong adhesion to electroplated copper, and can be widely used in the semiconductor manufacturing industry, and is particularly suitable for thinning the back of P-type silicon.

The invention discloses a grinding and polishing clamp for a plate-shaped tensile sample, and relates to the technical field of material processing engineering, the grinding and polishing clamp comprises a mounting disc, a liquid storage box and a clamping part; the mounting disc serves as a basic supporting part, a rotating shaft connector externally connected with a rotating driving device is arranged in the center of the mounting disc, the liquid storage box is arranged above the mounting disc, and the clamping part is arranged on the surface, away from the liquid storage box, of the mounting disc; the liquid storage box is used for storing and outputting polishing liquid or water, and the clamping part is used for clamping and positioning a plate-shaped tensile sample; according to the grinding and polishing clamp for the plate-shaped tensile sample, through the clamping block, the adjusting gasket and the anti-loosening structure, a thin plate sample is stably fixed, deviation and warping are avoided, meanwhile, the clamp can adapt to samples with different thicknesses and widths, the machining process is standardized, manual operation is replaced by automatic grinding, and the design of laminar flow liquid supply and flow adjustment of the guide plate is matched; the surface flatness and the roughness uniformity are ensured, the scale distance section machining area is accurately locked, and the characterization requirements of SEM and EBSD are met.

The present application discloses a developing roller, a processing box and a processing method for a developing roller, wherein the developing roller comprises a magnetic core and a developing sleeve, wherein the developing sleeve is made of metal, the developing sleeve is sleeved on the magnetic core, and the developing sleeve comprises a sleeve body and a working surface, wherein the working surface is located on the outer surface of the sleeve body, and the working surface and the sleeve body are integrally formed and made of the same material, the working surface is set as a rough surface with a concave-convex structure, and is used to carry carbon powder, and the absolute value of the roughness difference between any two points on the working surface is ΔR1, and 0≤ΔR1≤0.6μm. The roughness of the working surface of the developing roller of the present application is relatively uniform, so that the surface of the developing roller can stably and evenly carry carbon powder, and at the same time, the carbon powder charge in different regions is consistent, so that the density of the printed image is uniform, and the photocopying quality of the printed product is guaranteed.

This invention is a steel billet grinding process with a constant grinding wheel linear speed. First, the steel billet is automatically fed, positioned, and locked. A laser rangefinder detects the actual length of the steel billet and calibrates the grinding wheel to align with the billet's length center. Then, the grinding wheel is controlled to apply pressure and adhere to the steel billet, driving the billet to translate and complete the grinding of both sides. During the grinding stage at the billet's ends, the speed and pressure are automatically reduced to avoid over-grinding and sharpening at the ends. A trolley tilting mechanism rotates the billet 45° multiple times, cyclically grinding all sides and edges of the billet, using a repeated grinding method with decreasing feed depth to ensure grinding accuracy. Simultaneously, photoelectric switches on both sides of the grinding wheel monitor the wear on the outer circumference of the grinding wheel in real time, dynamically adjusting the grinding wheel motor speed to maintain a constant grinding linear speed, and simultaneously calibrating the distance between the grinding wheel and the billet to stabilize the grinding pressure. This invention effectively ensures uniform overall grinding quality of the steel billet and improves the grinding accuracy and stability of the billet's sides and edges.

The invention relates to a gradient feeding turning method based on prolonging of the service life of a tool, belongs to the technical field of machine tool cutting machining, solves the technical problem that the service life of the tool is short, and comprises the steps that according to machining requirements, a numerical control lathe turning tool is selected, and the turning tool is installed on a numerical control lathe; preparing a workpiece blank to be machined, and clamping the workpiece blank in a numerical control lathe fixture; measuring the cutter length of the turning cutter in the X direction and the Z direction, and inputting the cutter shape compensation value of the corresponding cutter number of the numerical control lathe; the programmed gradient feeding subprogram is input into the numerical control lathe, machining parameters are set, and the feeding speed calculated by the subprogram serves as the actual feeding speed; performing trial cutting processing on the workpiece according to a compiled program; measuring the structural size and the surface roughness of the machined workpiece blank, adjusting the gradient feeding subprogram, setting the feeding speed and the decreasing amount each time, and turning the workpiece according to the adjusted gradient feeding subprogram. The turning method is used for turning of a numerical control lathe.

The invention provides a defect removing and sand blasting device for quartz tube production and a using method, and relates to the technical field of quartz tube production, the defect removing and sand blasting device comprises a box body, an air exhaust box is installed at the top of the box body, a workbench is installed in the box body, an equipment block is installed at the top of the workbench, a storage cavity is formed in the equipment block, and an annular block is arranged in the box body; a plurality of open holes are formed in the annular block, nozzles are installed in the open holes, the discharging assembly is arranged between the air exhaust box and the storage cavity, the discharging assembly comprises a transmission cavity formed in the equipment block, and a rotating groove is formed in the inner wall of the air outlet pipe. According to the device, sand blasting treatment can be evenly conducted on the surface of a quartz tube through the sand blasting assembly, meanwhile, through cooperation with the discharging assembly, on one hand, dust floating in the box body can be extracted for filtering treatment, and on the other hand, gas flow generated in the gas extraction process can be utilized to drive an auger to rotate, so that sprayed materials are evenly discharged; and the quartz tube can be quickly clamped and fixed through the fixing assembly.

The utility model discloses a device for reducing stainless steel hot-rolled and pickled surface roughness. The device comprises a box body, a feed port, a discharge port, an isolation mechanism, a shot blasting mechanism, a cleaning mechanism, a conveying roller, a spiral conveyor and a storage box, the feeding port and the discharging port are located in the two ends of the box body respectively. The isolation mechanism is mounted on the inner side wall of the box body close to one end of the feed port, and the shot blasting mechanism is fixed in the isolation mechanism; the cleaning mechanisms are symmetrically mounted on the inner wall of the box body on one side of the isolation mechanism and are close to one end of the discharge port; the multiple conveying rollers are evenly and rotationally connected to the inner side wall of the box body. Motors IV are arranged at one ends of the conveying rollers; the storage box is fixed to the top of the box body, and the spiral conveyor is fixed to one side of the box body and connected with the bottom of the box body and the storage box through pipelines. According to the stainless steel pickling device, oxide skin on the stainless steel surface can be removed through the shot blasting mechanism, the stainless steel pickling efficiency and quality can be improved, and the roughness of the stainless steel surface can be reduced.

The invention relates to a cleaning process for a coated part. The cleaning process comprises the following steps: carrying out wet-process chromium removal treatment on the coated part by adopting an ammonium ceric nitrate solution; performing spraying treatment for the first time; performing first hot air drying treatment; carrying out surface sand blasting treatment; spraying for the second time; soaking with an acidic sanding agent; performing spraying treatment for the third time; soaking with nitric acid; and high-pressure spraying treatment is repeated. By the adoption of the cleaning process for the coated part, the film layer of the coated part can be thoroughly and evenly removed, and good surface roughening of the coated part is achieved.

The application discloses a preparation process and system of an ultralow-temperature heat-conducting basalt fiber yarn, and the preparation process comprises the following steps: after coating particles enter a target area, the coating particles float; the target area forms a floating area; the basalt fiber yarn moves through the floating area, and the coating particles in the floating area are adhered to the basalt fiber yarn; and after drying, a heat preservation layer is formed on the surface of the basalt fiber yarn. The application can form a heat preservation layer on the surface of the moving basalt fiber yarn, and a high-voltage electric field does not need to be formed between the basalt fiber yarn and the coating particles in the coating process, thereby avoiding a safety hidden danger caused by a continuously changing electric field caused by the continuously moving basalt fiber yarn, and improving the safety of the preparation process.