119results about How to "Eliminate scratches" patented technology

The invention provides a metal-plastic composite mobile phone shell and a forming method thereof. The provided mobile phone shell has a metal surface and a plastic structure feature, wherein the external surface of the mobile phone shell is made of a sheet metal and is small in wall thickness, high in strength and beautiful in appearance; a convex structure feature of the internal surface of the mobile phone shell is made of plastics, so that the formation of a complex installation structure is facilitated, and the functional requirements on assembling and shock absorption and the like are satisfied. According to the forming method, structure features of the sheet metal and the plastic are firmly combined together and form an integral structure. Meanwhile, according to the forming method, the combination strength of plastics and metals is high, so that the mobile phone shell satisfies the assembling and application requirements of mobile phones, and also can be applied to the shell production fields of household appliances, computers and other industrial products.

The invention discloses a hot-rolled pickled plate and a production method thereof. According to the hot-rolled pickled plate, based on a common low carbon steel component system, by reasonably adding microalloy elements B and Ti and combining insulation of a coilbox before finish rolling and relaxation and cooling after finish rolling, the effects of controlling structures and a precipitated phase as well as reducing KESHI gas mass in the low carbon steel are achieved, so that the stress difference of upper and lower yield points of a hot rolled strip is reduced to below 5MPa and the defect of surface cross breaks of the hot rolled strip in a pickling, uncoiling and straightening process is eliminated. Not only is the defect of surface cross breaks of the hot rolled strip solved, but also the conventional production process of eliminating cross breaks by temper rolling is further avoided, thereby shortening the time and lowering the cost for actual production of a steel mill. The production method is an economical and effective production method of the hot-rolled pickled plate. The hot-rolled pickled plate disclosed by the invention can be widely applied to industries of household appliances, automobiles and hardware mechanical and electrical products.

The invention relates to a method for preparing silica/ceria composite abrasive grains, which comprises the following steps: 1) adding organic additives to silicon sol, stirring until the organic additives dissolve, and then, adding trivalent or tetravalent cerium salts, so as to obtain a dispersion liquid; 2) placing the dispersion liquid in an autoclave provided with a PTFE (polytetrafluoroethylene) lining, sealing the autoclave and conducting a heating reaction; and 3) centrifugating, purifying and stoving after the reaction, and finally obtaining the silica/ceria composite abrasive grains.The silica/ceria nuclear-shell composite abrasive grains prepared by the invention contain no homogeneous-nucleation ceria grains; and the composite abrasive grains have the advantages that the polishing removal rate and the selectivity thereof can be effectively increased, the surface roughness thereof can be reduced and the defects, such as scratches, can be eliminated. Therefore, the compositeabrasive grains are applicable to the chemical mechanical polishing (CMP) of very-large-scale integrated circuits (VLSIC) and glass.

Various forms of knife guides are provided for knife sharpeners to minimize damage to the knife blade. The knife guides include the provision of flexible fibers on the guide surface and further include rings, such as O-rings on an array of rollers when the rollers are used to form the guide surface. Other forms of knife guides are non-contact optical arrangements.

To eliminate scratches on a disc surface of an optical disc in an emergency eject operation, there is provided an optical disc apparatus including: an emergency eject detector for detecting an emergency eject instruction; a rotation speed detector for producing a signal corresponding to the rotation speed of the optical disc; and a logical circuit unit which is operated by a first signal from the emergency eject detector and a second signal from the rotation speed detector, and when the second output signal is not more than a reference level, produces a third signal so as to input a control signal for instructing stop of the actuator control into an actuator controller. After detection of the emergency eject instruction, the apparatus performs the actuator control without producing the third signal until the rotation speed is not more than a predetermined value. Thus the objective lens is made in a focus control state or in a saving state in which the objective lens is separated from the disc surface.

The invention discloses a high-precision efficient automatic grinding and detecting production line which comprises a manipulator mechanism (s) with three degrees of freedom, a cleaning mechanism (q), a turnover mechanism (f), a detecting mechanism (j), a working table (g), a material table (w) and two grinding machines (m). The two grinding machines (w) are respectively arranged at two ends of the working table (g); the manipulator mechanism (s) with the three degrees of freedom is used for loading and unloading materials; the working table (g) is used for mounting the manipulator mechanism (s) with the three degrees of freedom, the cleaning mechanism (q), the turnover mechanism (f), the detecting mechanism (j) and the material table (w); the material table (w) is used for arranging workpieces. The invention further provides a high-precision efficient automatic grinding and detecting production method. The high-precision efficient automatic grinding and detecting production line and the high-precision efficient automatic grinding and detecting production method have the advantages that the high-precision efficient automatic grinding and detecting production line is compact in structure, material grabbing, workpiece cleaning, workpiece turnover and workpiece detecting and mounting can be carried out on the same working table, the two grinding machines can be in simultaneous working states under various actions of manipulators, and accordingly the work efficiency can be greatly improved.

The invention provides a double-sprayer switching device for a 3D printer. The double-sprayer switching device for the 3D printer comprises two switch blocks of a mutual mirror structure, a rotation piece and two elastic pieces. The two switch blocks are installed on two sprayer devices. Each switch block is provided with a pressure bearing portion. Each pressure bearing portion comprises a downward pressing station stopping portion, a pressure transferring portion and a return station stopping portion, wherein the pressing station stopping portion, the pressure transferring portion and the return station stopping portion are sequentially connected. The rotation piece is connected with a machine shell. Two pressing pieces are arranged on the rotating piece. The two elastic pieces are arranged on the two sprayer devices in a sleeving manner. The elastic pieces support the switch blocks. The rotating pieces can rotate in a reciprocating manner. The rotating piece drives the pressing pieces to move on the pressure bearing portions. When the pressing pieces move from the return station stopping portions to the downward pressing station stopping portions, the pressing pieces push the pressure transferring portions to move downwards. When the pressing pieces move on the downward pressing station stopping portions or the return station stopping portions, the pressure bearing portionskeep the stopped state. The double-sprayer switching device for the 3D printer can eliminate the phenomenon that in the 3D print process, the double sprayer devices scratch each other, and the sprayerdevices have high locating precision and high repeated locating precision in the movement process.

To provide a pin tip attachment structure that can engage a container with a bottom, such as a can or bottle, and convey the container without scratching it, a small diameter portion having a predetermined length is formed at a front end portion of a pin. A bushing is fitted in a lower end portion of a cylindrical hole of a pin tip having the cylindrical hole opened at a lower end side, and the bushing is vertically movably inserted onto the small diameter portion of the pin. A stopper portion for retaining the bushing is provided at a front end of the small diameter portion. A spring receiver portion is provided below the small diameter portion, and a coil spring is provided in a compressible manner between the spring receiver portion and the bushing or the lower end of the pin tip.

The invention discloses a single-roller rectification device during proceeding. The single-roller rectification device comprises a movable track mechanism and a film detecting mechanism, wherein connecting plates are fixedly connected to two ends of the upper surface of a lower fixed bracket of the movable track mechanism respectively, and are connected with an upper movable bracket through deflection mechanisms; guide roller brackets are fixedly connected to two ends of the upper movable bracket, and a rectification guide roller is arranged between the guide roller brackets; a pusher is mounted between the lower fixed bracket and the upper movable bracket; the film detecting mechanism comprises a fixed detection frame, guide plain shafts are mounted on the detecting fixed frame, a screw rod is arranged between the guide plain shafts, a bar-shaped support frame is fixedly connected to one end of the screw rod, two ends of the support frame are nested on the guide plain shafts, and the other end of the screw rod is connected with a synchronous motor; the guide plain shafts are further sleeved with a sliding block which is in threaded connection with the screw rod; and a detecting head is mounted on the sliding block. According to the single-roller rectification device, the film can be rectified to a suitable position precisely in a high-speed proceeding process, and is not prone to wrinkling or scrapping.

The invention discloses a large composite material skinned die and a manufacturing method thereof. The die comprises a combined welding supporting base, a combined welding supporting frame, a glass steel layer and an epoxy resin layer which is stuck on the glass steel layer, wherein a layer of fluorinated polyurethane lusterless porcelain varnish is coated on the surface of the epoxy resin layer. Pits on the surface of epoxy resin are completely filled through the fluorinated polyurethane lusterless porcelain varnish, which can be tightly combined with the epoxy resin and has high permeability; the defect that micro air vents are formed on the surface of the epoxy resin of the large composite material skinned die is overcome substantially; and the surface quality and the air tightness reliability of the large composite material skinned die are obviously improved.

The invention discloses a tensile clamp for a self-lubricating wedge jaw testing machine. A clamping base is provided with a U-shaped cavity with a narrow opening and a wider bottom. A clamping block is connected with one side face of a sliding block. The other side face of the sliding block corresponds to the side wall face of the U-shaped cavity of the clamping base. The side face, matched with the side wall face of the U-shaped cavity of the clamping base, of the sliding block is coated with a wear-resistant material or provided with a friction plate in an embedded mode, and a pair of sliding friction faces are formed. The friction faces do not need to be lubricated by an oil film, friction force between the sliding block and the clamping base can be lowered, the servo performance of the sliding block can be greatly improved, eccentricity of a jaw during a tensile test is overcome, a working face of the clamping base is protected forcefully, and scratches of the friction faces of the clamping base are eliminated; the phenomenon that a test curve fluctuates due to the fact the a clamp is clamped is avoided, the experimental data accuracy can be improved, the service life of the clamp can be prolonged, and the tensile clamp can work for a long time on the oil-free lubrication condition. After the clamp is used for a long time, only the friction plate needs to be replaced, and the sliding block or the clamping base does not need to be replaced.

The invention discloses a method for detecting distribution and the content of residual austenite in low alloy structure steel. Water is used as cooling liquid, metallographic waterproof abrasive paper is used for rough grinding and fine grinding of a test surface of a sample, the sample subjected to fine grinding is polished, sodium metabisulfite, picric acid, sodium hydroxide, distilled water, hydrochloric acid and absolute ethyl alcohol are mixed, stirred and heated to prepare a corrosion reagent, the polished sample is subjected to electrolytic polishing treatment, the sample subjected toelectrolytic polishing treatment is placed into prepared corrosion solvents to remove interference phases, and distribution and the content of the residual austenite of the sample are detected by metallographic observation and representation. The method is simple in operation and short in polishing corrosion time. After the low alloy structure steel is corroded, a residual austenite structure in the low alloy structure steel can be clearly displayed. Characteristic parameters such as the content, the size, the shape and distribution of the residual austenite can be rapidly, accurately and quantitatively analyzed by metallographic software.

The invention discloses a rubber and plastic granulator. The granulator structure comprises a driving case, a granulating mechanism, a conveying plate and a rack, the side edge of the driving case isconnected to the granulating mechanism, a conveying plate is arranged at the bottom of the granulating mechanism and communicates with the granulating mechanism, and the rack is arranged on the bottomend surface of the driving case. The granulator has the beneficial effects that: a knife groove of a unique folding knife holder can accommodate a knife edge on a knife board, so that the knife boardcan descend for a certain distance again after the rubber plastic strip is cut and is prevented from being in contact with a pressure-bearing seat, the phenomenon that nicks are generated due to impact and collision between the knife edge and the pressure-bearing base is effectively eradicated, the granulator guarantees that the knife edge can have a sharp cutting state in the operation process,a unique knife sharpening shaft structure is beneficial for keeping the sharpness degree of the knife edge, and therefore it is guaranteed that the cut rubber plastic particles are standard in shape and flat in fracture.

The present invention is an oral device comprised of two main components, a U-shaped lower bite plate and a U-shaped upper bite plate, which are molded to fit the front teeth of a wearer with a soft flexible contact surface. The oral device of the present invention comprises an upper bite plate and a lower bite plate each having a generally U-shaped appearance. The upper bite plate removably fits over the upper teeth of a person and the lower bite plate removably fits over the lower teeth of a person. Each bite plate includes a U-shaped buccal side and a U-shaped lingual side connected by a U-shaped top portion. The U-shaped top portion is further comprised of an exposed surface and an attaching surface where the exposed surface is the surface that contacts a penis, clitoris, or other body part while the attaching surface contacts the wearer's teeth.

The invention provides a main bearing sealing system for a wind generating set. The main bearing sealing system comprises front and rear positioning rings of a bearing, front and rear sealing covers, a sealing and spacing piece, a framework oil seal, a V-shaped wiper scraper seal, an O-shaped ring, and a bearing end cover. The V-shaped wiper scraper seal is arranged on an atmosphere side, and the framework oil seal is arranged on a grease side. Both the V-shaped wiper scraper seal and the framework oil seal are provided with sealing lips which can freely slide on the surface of a shaft.

The invention discloses a polishing agent for precise polishing of a high-alloy-aluminium metallographic sample. The polishing agent comprises water, corundum particles and sodium hydroxide, namely, sodium hydroxide, which is an chemical aggressive agent, is added in corundum polishing suspension formed by water and corundum powder, so that not only can the problems of disturbance layers and scratches of mechanical polishing be avoid, but also the problem of disappearance or protrusion of part of phase corrosion of electrolysis and chemical polishing can be avoid, further, the circumstance of observation illusion can be avoided; and meanwhile, the time for precise polishing can be shortened greatly, so that the purpose of preparing high-quality metallographic samples quickly can be achieved. When the agent for precise polishing of a high-alloy-aluminium metallographic sample, provided by the invention, is in use, a polisher is started first, then a reagent bottle filled with the polishing agent is shaken until the polisher runs normally so as to ensure that the polishing agent is mixed uniformly, and the reagent bottle is compressed to enable the polishing agent to be uniformly sprayed onto polishing fabric of the polisher. The invention further discloses a precise polishing method for a high-alloy-aluminium metallographic sample.

The invention relates to an electromagnetic disc brake and a traction machine provided with the electromagnetic disc brake. The electromagnetic disc brake disclosed by the invention comprises a stationary iron core and two movable iron cores through electromagnetic interaction, two brake discs fixed with a main shaft, and two brake plates which are matched with the movable iron cores and are used for clamping the brake discs, wherein the two movable iron cores are respectively positioned on the two sides of the stationary iron core, and a brake spring is arranged between each of the two movable iron core and the stationary iron core; a coil winding acting on each movable iron core is arranged on the stationary iron core; the two brake discs and the two brake plates are arranged outside the corresponding movable iron cores in sequence. The stationary iron core, the two movable iron cores and the two brake plates are fastened in a penetrating mode through a connecting sleeve, unthreaded holes penetrating through the connecting sleeve are formed in the stationary iron core, the two movable iron cores and the two brake plates, the connecting sleeve and the stationary iron core are connected through interference fit, and the connecting sleeve and the brake plates are pressed together through riveting. The electromagnetic disc brake is smaller in size, safe and convenient to use and convenient to maintain.

The invention discloses a groove roller-type cable pipe mouth sheath device. The groove roller-type cable pipe mouth sheath device comprises a pipe mouth baffle ring and a positioning short pipe, wherein the positioning short pipe is inserted into a cable protection pipe, a plurality of roller bases are arranged on an inner wall of the positioning short pipe, an arc groove roller is arranged between adjacent roller bases by a roller shaft, the groove arcs of the plurality of groove rollers are concentric with equal radius, preferably, and an angle of a fan-shaped coverage region of the plurality of groove rollers in the cable protection pipe is larger than or equal to 120 degrees. The grove roller-type cable pipe mouth sheath device has the beneficial effects of simple structure and low fabrication cost, can be repeatedly used and is convenient to carry and disassemble; sliding friction between a cable at a cable protection pipe inlet and the cable protection pipe is changed to rollingfriction, the resistance during the construction process is greatly reduced, meanwhile, direct contact of the cable and the cable protection pipe is prevented, and the risk that the cable is damagedis reduced.

The invention discloses a nano-diamond automatic repair liquid for a reciprocating piston engine. The liquid is characterized by being prepared by the following steps: (1) adding a nano-diamond into a dispersant OP-10, stirring for over 20 minutes, then standing, and after bubbles fully disappear and black precipitates appear at the bottom, pouring out a supernate, wherein the nano-diamond is a spherical particle, the grain size of which is 2-4n, and the addition proportion of OP-10 and the nano-diamond is 0.8-1.2mg of nano-diamond per L of OP-10; and (2) adding the supernate into lubricating oil, and stirring and mixing to obtain the automatic repair liquid, wherein the weight ratio of the supernate and the lubricating oil in percentage by weight is (10-30%):(90-70%). The nano-diamond in the automatic repair liquid is good in dispersing effect and stable and can be placed for a long time. The repair liquid is simple in formula, low in cost and simple in preparation method.

The invention relates to the technical field of precision machining and in particular relates to a polishing solution, a preparation method thereof and a processing method of a silicon carbide crystal. The polishing solution comprises the following components in parts by weight: 5-30 parts of polycrystalline diamond micropowder, 1000 parts of silica sol, 2-40 parts of a suspending agent,4-21 partsof a wetting agent, 2-14 parts of a defoaming agent and 2-10 parts of a pH regulator. The preparation method comprises the steps: mixing the polycrystalline diamond micropowder, the suspending agent,the wetting agent, the defoaming agent and the pH regulator, adding the mixture into water, then, adding silica sol, and carrying out uniform stirring. The polishing solution can be used for processing the silicon carbide crystal. If the polishing solution disclosed by the invention is matched with a polishing pad to polish silicon carbide, the precision polishing time can be effectively shortened, the whole grinding and polishing time can be shortened, and the surface quality of the crystal can be remarkably improved.