28 results about "Hard chromium" patented technology

The invention belongs to the technical field of metal surface treatment, and discloses an electroplating additive suitable for a steel and alloy surface bright wear-resistant corrosion-resistant hexavalent chromium coating, which is characterized by comprising an organic compound, an inorganic acid, a metal inorganic compound and water, the organic compound comprises a mixture of a fluorine-free compound and a fluorine-containing compound. The method can be widely applied to decorative chromium plating and functional hard chromium plating, the electroplating temperature is 40-70 DEG C, the electroplating time of the decorative chromium plating is 1-10 min, the electroplating time of the hard chromium plating is 20 min or above, the hardness can reach 900 HV or above, the glossiness of the surface of a workpiece can be kept through the decorative plating and the hard chromium plating, the current efficiency can reach about 23%, and the service life of the workpiece is prolonged. The current use requirements of high efficiency, stability and environmental protection are met, and the market prospect is good.

The utility model provides a liquid expansion mandrel fixing device for processing a hard chromium plated ball, which belongs to the technical field of hard chromium plated ball processing, and comprises a mandrel main body, and the inner part of the mandrel main body is divided into cavities and is used for realizing uniform expansion; a filling hole is formed in one side of the core shaft main body and is used for filling a hydraulic medium into the core shaft main body; a sealing screw is arranged at an opening of the filling hole; an expansion chamber and a compression chamber are arranged in an inner cavity of the mandrel body, the compression chamber is arranged on one side of a center shaft of the mandrel body, and a linkage structure is arranged in the compression chamber and used for clamping a ball. The utility model provides a liquid expansion mandrel fixing device for processing a hard chromium plated ball, which can solve the problems that the clamping force is concentrated on a local area and a plating layer is easy to crush due to the single-cavity design of the existing liquid expansion mandrel.

The utility model discloses a highway pavement flatness detection device, and belongs to the technical field of highway pavement detection.The detection device comprises a pavement flatness detector vehicle body and an assembly frame installed on the pavement flatness detector vehicle body, and walking wheels are distributed at the lower end of the pavement flatness detector vehicle body at equal intervals; a wheel carrier is rotationally connected to the assembly frame, a measuring wheel is arranged at one end of the wheel carrier, a magnetic block is arranged at the other end of the wheel carrier, and a sensor corresponding to the magnetic block is arranged on the road surface flatness detector vehicle body; transverse movement of the clamping plates is achieved through rotation of the lead screw, the collection control box located between the two clamping plates is clamped or loosened, the surface of the positioning rod is plated with hard chromium, the positioning rod is matched with a linear bearing of the arm plate, it is ensured that the clamping plates move stably, and finally the two clamping plates get close to each other and clamp and fix the collection control box. If the acquisition control box needs to be taken down in the later period, the screw rod only needs to be manually and reversely rotated.

The application belongs to the technical field of alloy materials, and relates to a Cr-Fe alloy layer for prolonging the service life of a barrel and a preparation method thereof. The Cr-Fe alloy layer comprises Cr: 45-85wt%, Fe: 14-54wt%, C: 0-1.2wt%, and O content is less than or equal to 0.3wt%; the Cr-Fe alloy layer is prepared by laser processing, the microstructure is mainly BCC phase, and 3-8% of Cr 23 strengthening phase is uniformly precipitated; the Cr-Fe alloy layer is metallurgically combined with the barrel substrate, the surface Vickers hardness is 400-600HV, and the mass loss is less than or equal to 0.01g in 500 high-temperature erosion wear cycle tests. The Cr-Fe alloy layer with specific components is formed by optimizing laser processing parameters, microcracks of the hard chromium plating layer are effectively repaired, the high-temperature erosion wear loss rate is reduced, and the service life of the barrel is prolonged.

The invention discloses an aluminum alloy surface anti-corrosion composition and a preparation method and application thereof.In the surface anti-corrosion composition, a WC hard phase provides the framework hardness of a coating, a Co-Cr metal phase endows the coating with good toughness, and the WC hard phase and the Co-Cr metal phase act synergistically, so that the obtained coating has excellent hardness, wear resistance and corrosion resistance; according to the surface anti-corrosion composition, rare earth powder is introduced to serve as an auxiliary, grains can be refined, grain boundaries can be purified in the coating, formation of a denser coating is promoted, an optimized Co-Cr metal phase is combined, and the corrosion resistance of the surface anti-corrosion composition is greatly improved. The long-acting corrosion resistance of the coating in severe environments such as salt mist and damp and hot environments is remarkably improved through synergism, bubbling and stripping of the coating and corrosion of a base body are effectively inhibited, and the remarkable corrosion resistance effect is achieved on the whole.

The utility model discloses a shock absorber working cylinder which comprises a working cylinder body, the inner surface of the working cylinder body sequentially comprises a uniform rough surface layer formed through preliminary honing, a hard chromium plating layer covering the uniform rough surface layer and a fine honing chromium plating layer located on the surface of the hard chromium plating layer, and the hardness of the fine honing chromium plating layer is larger than or equal to 800 HV. The surface roughness Ra is 0.1-0.4 micrometer, the roundness tolerance is smaller than or equal to 0.01 mm, and the straightness tolerance is smaller than or equal to 0.015 mm / 100 mm. Through the multi-layer structural design, the hardness, the surface smoothness and the geometric accuracy of the inner wall of the working cylinder are remarkably improved, friction force and abrasion are reduced, the service life is prolonged, and the durability of the working cylinder of the shock absorber is improved.

The utility model relates to the technical field of knurled bolts, in particular to a high-toughness wear-resistant knurled bolt for a heavy-duty car. The high-toughness wear-resistant knurled bolt for the heavy-duty car comprises a knurled bolt, and a conical anti-skid sleeve is sleeved on the outer ring of a screw rod of the knurled bolt; according to the knurled bolt, due to the good tensile strength and toughness of the alloy steel and the good wear resistance of the hard chromium, the whole knurled bolt can have high toughness and wear resistance, and when the knurled bolt penetrates through the bolt counter bore in the wheel to be in threaded connection with the threaded hole in the vehicle body, the conical anti-skid sleeve can be tightly attached to the bolt counter bore in the wheel, so that the anti-skid effect is good. And the anti-skid knurls at the bottom of the pressing ring can be tightly attached to the bottom of the inner side wall of the bolt counter bore in the wheel, so that the connection stability between the knurled bolt and the wheel can be effectively improved, the stress change range of the knurled bolt under the action of alternating loads can be reduced, the fatigue life is prolonged, and then the effect of reducing abrasion is achieved.

The invention relates to the technical field of intermediate film embossing, in particular to a continuous embossing method and device for a laminated glass intermediate film, the device comprises guide rollers, a cooling roller, a first embossing mechanism and a second embossing mechanism, and the intermediate film sequentially bypasses the first embossing mechanism, the cooling roller and the second embossing mechanism through a plurality of guide rollers. The first embossing mechanism and the second embossing mechanism are used for respectively embossing the two surfaces of the middle film; each of the first embossing mechanism and the second embossing mechanism comprises a pattern roller and a rubber roller; the rubber roller is rotationally mounted on the main frame and is driven by a motor to rotate; the pattern roller is rotationally installed on the sliding frame through a bearing seat, the sliding frame is fixedly installed on the main frame through a fixing frame, and the pattern roller is driven by a driving motor to rotate. Patterns on the surface of the patterned roller can be specifically protected, a hard chromium plated / Teflon coating on the surface of the patterned roller is prevented from being damaged, the equipment maintenance cost is reduced, and the downtime is shortened.

The invention relates to the technical field of resin-based composite material forming, in particular to a high-finish-degree high-pressure-resistant carbon fiber tube preparation process which comprises the following steps: step 1, tool preparation: preparing a core mold blank from stainless steel, hardening and polishing the surface of the core mold blank, and electroplating hard chromium, so as to obtain a high-finish-degree high-pressure-resistant carbon fiber tube; a core mold with high surface hardness and smoothness is obtained, and then the surface of a core mold blank is coated with a release agent for standby application; step 2, material preparation: selecting T700-grade carbon fibers with the diameter of 0.15 mm; 3, winding, wherein the carbon fiber yarn is led out of the creel and soaked in the resin system. By means of the winding angle design optimized in the annular and oblique alternating mode, the pipe has high strength and rigidity in the axial direction and the annular direction, and internal high pressure and external side pressure can be effectively resisted. Tests show that the sample tube (such as the specification of phi 25mm) prepared by the process can be kept for more than 45 seconds under the internal pressure of 45MPa without cracking or obvious plastic deformation, and the radial deformation is less than or equal to 0.05 mm.

The utility model discloses a power distribution equipment valve mechanism which comprises two guide rods which are symmetrically arranged, an upper valve and a lower valve which are movably arranged on the two guide rods, hard chromium layers are plated on the surfaces of the guide rods, connecting grooves are formed in the two sides of the upper valve and the two sides of the lower valve, connecting sleeves are arranged in the connecting grooves, and the upper valve and the lower valve are connected through the connecting sleeves. The connecting sleeve is connected with the two guide rods in a sleeved mode, a plurality of oil storage cavities are formed in the inner wall of the connecting sleeve in the radial direction and filled with lubricating oil, a wear-resisting ring is arranged between every two adjacent oil storage cavities, and sealing rings are arranged at the positions, close to the outlets, of the two ends of the inner wall of the connecting sleeve. The connecting sleeves are arranged on the two sides of the upper valve and the two sides of the lower valve, so that the upper valve and the lower valve are prevented from making direct contact with the guide rod, the effect of reducing friction is achieved, sliding of the valves is smoother, the clamping stagnation phenomenon is avoided, abrasion is reduced, and the service life is prolonged; and large noise generated when the upper valve and the lower valve slide is avoided.

According to the surface treatment method, the advantages of milky white chromium and hard chromium are combined, milky white chromium is electroplated on the inner surface of a cylinder barrel firstly, then hard chromium is electroplated on the inner surface, and finally a composite protective coating which can improve the corrosion resistance of the inner surface and the wear resistance of the inner surface and is excellent in binding force is obtained. The technical problems that the inner surface of an existing cylinder barrel is prone to rusting, abrasion, scratching and the like due to the fact that no effective protective coating exists on the inner surface of the cylinder barrel are solved, the method is reasonable, feasible and ingenious in design, the corrosion resistance of the inner wall of the jack cylinder barrel can be improved, the abrasion resistance of the inner wall of the cylinder barrel can be improved, and the protective coating is excellent in binding force. And the service life of the jack is prolonged.

Sleeves that can be disposed on either end of a bushing to improve the wear characteristics and usable lifetime of the bushing is disclosed. During the use of the bushing, such as when a machine including the bushing is operated, the sleeves may be in primary contact with abrasive elements (e.g., other parts of the machine, dirt, rock, etc.) and wear, while the underlying bushing is protected, at least in part, from wear and tear. The sleeves may include a bulk material, such as steel, with a hard coating thereon, such as hard chromium, tungsten carbide, or the like. The hard coating may be formed by any variety of processes, such as electroplating, plasma deposition, thermal deposition, or the like. In some cases, the sleeves, after being worn from use, may be replaced or refurbished to further extend the lifetime of the bushing.

The utility model discloses a high-strength wear-resistant change gear set, and belongs to the technical field of gears. The gear set comprises a multi-stage speed change gear, a gear set center shaft and a speed regulation gear ring which are all made of carburized and quenched alloy steel. The gear tooth middle section of the change gear is provided with an oil passing groove to improve lubrication, tooth surface bevel angles are machined at the two ends of the tooth crest to reduce meshing impact, and a tooth bottom groove is plated with a hard chromium wear-resistant layer to improve wear resistance; shaft hole oblique angles are arranged on two sides of the central shaft hole and are matched with transition oblique angles of the central shaft to reduce assembly friction; and the contact area of the adjacent gears is reduced by the annular tooth surface grooves at the spokes. Through structural optimization and surface strengthening, the wear resistance and the contact strength of the gear are remarkably improved, the service life of a change gear set is prolonged, and the gear set is suitable for a high-load gearbox system.

The invention belongs to metal material surface treatment, and particularly discloses a CT bulb tube electroplating method and an electroplating tool, and the method comprises the following steps: carrying out insulation shielding on a CT bulb tube; hanging the CT bulb tube after insulation shielding; and immersing the hung CT bulb tube in an electroplating solution for electroplating to obtain the CT bulb tube with an electroplated layer. The hard chromium-black chromium composite coating which is uniform, high in binding force and high in radiation efficiency can be prepared on the surface of the CT bulb tube, so that the performance of the CT bulb tube is improved, and the service life of the CT bulb tube is prolonged.

The invention relates to the technical field of remanufacturing and surface engineering of key parts of a helicopter transmission system, in particular to a partition repairing method for corrosion of an inner spherical shell of a speed reducer. Comprising the following steps: dividing a to-be-repaired inner spherical shell of the speed reducer into an inner spherical area and a cylindrical surface and end surface area; the corrosion layer of the inner spherical surface area is removed, the inner spherical surface area with the corrosion layer removed is obtained on the inner spherical surface shell of the speed reducer, a hard chromium layer is prepared on the inner spherical surface area with the corrosion layer removed through electroplating, and the electroplated inner spherical surface area is obtained on the inner spherical surface shell of the speed reducer after accurate grinding; the method comprises the steps that a cylindrical surface and an end face area are obtained, a corrosion layer on the cylindrical surface and the end face area is removed, the cylindrical surface and the end face area with the corrosion layer removed are obtained, a copper-aluminum layer is prepared on the cylindrical surface and the end face area with the corrosion layer removed through plasma spraying, and an inner spherical area obtained after plasma spraying is obtained on the inner spherical shell of the speed reducer after accurate grinding. The problem of part missing caused by corrosion of the inner spherical shell is solved.

The application discloses a tee type flange connecting electrode for pure water and a forming method thereof, and belongs to the technical field of CNC machining and material welding forming. The electrode comprises a tee main body and a flange welded to the interface end of the tee main body; the tee main body is integrally forged and formed through CNC precision machining, and the wall thickness error is controlled within mm. The flange and the tee main body are seamlessly welded, and the welding protrusions overflowing from the inside and outside of the welding position are removed, so that the welding seam is smooth and free of sand holes and pores. The inner flow channel surface of the tee electrode is polished and treated by electroplating hard chromium or plating platinum, so that the inner surface smoothness reaches Ra The application significantly improves the pressure bearing capacity and service life of the electrode through the integrally forged and seamless welding process, enhances the corrosion resistance by using the high smoothness plating layer, reduces the fouling problem caused by ionization discharge, and has the advantages of scientific structure, convenient connection, low cost and installation convenience.

The utility model relates to a kind of anti-loosening MPO buckles, belong to MPO buckle technical field.The anti-loosening MPO buckle includes: adapter, plug, sleeve, limit frame, hinge and limit frame, two the side of the limit frame mutually close side along the two side surfaces of the plug slide and embed the two side interiors of the plug;Sleeve inner wall annular anti-skid line, and with the initial pre-tightening force formed to plug surface, the V-shaped guide slot of limit frame along the two sides of plug slide, limit frame is embedded plug with interference fit, form first level mechanical lock, hinge drives limit frame reverse rotation, terminal insertion limit frame, by stainless steel interference fit realizes secondary interlock, the annular inner wall of limit frame is wrapped plug outer wall, surface plating hard chromium layer reduces plug abrasion, form three levels of wrapping constraint, the design is through material stiffness optimization, three levels of locking structure and self-adapting gap compensation, realize not easy to loosen under wide temperature environment, applicable to base station high frequency plug-in scene.

The invention relates to the technical field of electroplating additives, in particular to an environment-friendly high-wear-resistance hard chromium electroplating additive and a preparation method and application thereof. The additive is prepared by mixing a core function liquid and an auxiliary dispersion liquid, the core function liquid is prepared by mixing sodium benzenesulfinate, sodium thiosulfate, benzenesulfonic acid, tartaric acid, nano composite particles and deionized water, and the auxiliary dispersion liquid is prepared by mixing alkylphenol ethoxylates, polyethylene glycol 400 and a 50vol% ethanol solution. The coating does not contain fluorine components, and is environment-friendly and easy to treat; and the current efficiency reaches 22-27%, the deposition speed is 1 micron / min, the plating hardness is 1000-1100 HV, the wear resistance and the deep plating capacity are excellent, the additive is suitable for surface strengthening of precision parts such as molds and piston rods, and the problems that an existing additive is poor in environmental protection property and insufficient in performance are solved.

The invention belongs to the technical field of titanium alloy surface treatment, and particularly relates to a preparation method of a high-corrosion-resistance gradient coating on the surface of a titanium alloy shaft body, which comprises the following steps of: pretreating the surface of the titanium alloy shaft body, performing two-step activation treatment, plating a compact chromium layer, performing vacuum heat treatment, and plating a hard chromium layer. According to the method, the two-step activation process is combined with the vacuum low-temperature and high-temperature heat treatment process, so that the binding force of the plating layer is improved, and the corrosion resistance of the titanium alloy shaft body is improved through the specific technological process and parameter control. The composite coating with continuous gradient change of components, structures and performance, high bonding strength, high density and excellent corrosion resistance is prepared on the surface of the titanium alloy shaft body, the problems of weak interface bonding and performance mutation are effectively solved, and the chromium plating effect of the titanium alloy shaft body is remarkably improved.

The invention discloses a processing technology of a ball body of a ball valve, which belongs to the technical field of processing of ball bodies of ball valves and comprises the following steps: providing a ball body blank made of a metal material; carrying out rough turning on the ball blank on a numerical control lathe; a through flow channel through hole is drilled in the ball body, and the axis of the flow channel through hole passes through the center of the ball body; the ball body is installed in a special grinding clamp, the special grinding clamp achieves radial positioning and clamping through a conical positioning mandrel inserted into the flow channel through hole, the axis of the flow channel through hole serves as the rotating reference, and the outer surface of the ball body is precisely ground on a numerical control spherical grinding machine; carrying out pre-grinding treatment on the surface of the ground ball body; performing quenching, tempering and subzero treatment on the pre-ground ball body in sequence; the surface of the ball subjected to heat treatment is subjected to pulse electroplating hard chromium treatment; and carrying out vibration finishing treatment on the electroplated ball body. The coaxiality of the spherical surface and the through hole is improved, and the problem of leakage caused by eccentricity of the sealing surface of the ball valve is solved.

The application provides a self-repairing gradient structure chromium-plated roll and a preparation method thereof, and comprises the following steps: A) quenching and surface nanocrystallization treatment is performed on the surface of the roll base; B) a gradient transition layer is electroplated on the surface of the base; C) pulse magnetic field annealing treatment is performed on the gradient transition layer; D) surface nanocrystallization treatment is performed on the gradient transition layer; E) under ultrasonic conditions, a self-repairing working layer is deposited on the surface of the gradient transition layer by using pulse current, and the electroplating solution of the working layer comprises hard chromium main salt, sulfuric acid, nanodiamond particles, TiO2 shell / silane-Cr core microcapsules, a dispersing agent and a surfactant; and F) pulse magnetic field annealing treatment is performed on the self-repairing working layer to obtain the self-repairing gradient structure chromium-plated roll. The application introduces a gradient transition layer between the base and the working layer, and constructs a nanocrystalline layer through nanocrystallization technology, thereby solving the technical problem that the coating of a traditional chromium-plated roll is prone to falling off; and the microcapsules are introduced into the working layer, thereby realizing the self-repairing function.

The utility model belongs to the technical field of injection molds, and particularly relates to a HEPA ring injection mold convenient for quick demolding, which comprises an upper fixing plate, a female mold plate is fixedly mounted on the left side of the upper fixing plate through screws, a male mold plate is arranged on the side surface of the female mold plate, and an ejection mechanism and a cooling mechanism are arranged in the male mold plate. According to the HEPA ring injection mold convenient to quickly demold, on one hand, the surface of the additionally arranged vibrating plate is subjected to hard chromium plating treatment, and a chromium plating layer of 20-50 microns not only enhances wear resistance, resists friction loss and prolongs the service life by virtue of high hardness, but also reduces the friction coefficient with a HEPA ring by virtue of high smoothness, and improves the demolding efficiency and the product quality; and the performance of the vibrating plate is stabilized by good corrosion resistance. And on the other hand, a spring I and a spring II in the ejection mechanism act together, so that an elastic sheet group triggers a vibration plate to vibrate, the adhesion problem of the HEPA ring and the mold is solved, product damage is avoided, and the vibration plate is matched with the male mold core in shape, so that demolding is smoother.

The kneading rotor according to one aspect of the present disclosure is a kneading rotor for a kneading machine, comprising a base made of carbon steel or alloy steel for machine structure, a padded layer made of austenitic stainless steel on at least part of a surface of the base and has a hard chromium plated layer on at least part of a surface of the padded layer.

This bicycle chain (1) comprises a pair of inner plates (21), a roller (22) disposed between the inner plates (21), a pair of outer plates (31) disposed outside the inner plates (21), a pin (32) that connects the outer plates (31) in a state of being inserted through the roller (22), and a bearing part (26) disposed between the pin (32) and the roller (22). The surface of the pin (32) is coated with a coating film including a vanadium carbonitride coating film. The surface of the bearing part (26) is coated with a coating film including any one of a fluorine lubrication plating, a hard chromium plating, and a hard carbon coating film.

The utility model relates to the technical field of new energy lithium battery production equipment components, and discloses a new energy lithium battery rotating disc pressing block clamping jig which comprises a rotating main body mechanism, a connecting mechanism is arranged at the top end of the rotating main body mechanism, a positioning clamping mechanism is arranged in the rotating main body mechanism, and the rotating main body mechanism comprises a rotating disc. The rotating disc, the positioning clamping block and the supporting rod which are easy to wear are made of wear-resistant materials, namely the rotating disc, the positioning clamping block and the supporting rod are made of hard alloy materials, the surfaces of the rotating disc, the positioning clamping block and the supporting rod are subjected to hard chromium plating treatment, the positioning groove matched with the positioning clamping block is formed in the top end of the rotating disc, and the two auxiliary positioning blocks are fixedly connected to the inner side of the positioning groove. And the positioning clamping blocks are also provided with sliding grooves matched with the auxiliary positioning blocks, after long-term use, the positioning clamping blocks of the positioning jig can still carry out good stable positioning lifting work, and stable positioning clamping of new energy lithium battery production workpieces can be carried out.

The utility model discloses a bulking machine tail sealing device which comprises a hydraulic cylinder body, a piston rod is movably arranged in the hydraulic cylinder body, the end, away from the hydraulic cylinder body, of the piston rod extends out of the hydraulic cylinder body to be connected with a die head, and a sealing piece is fixed to the surface of the side, facing the die head, of the hydraulic cylinder body through a limiting assembly. The limiting bolt is inserted into the threaded hole, the sealing sleeve is fixed to the outer side of the hydraulic cylinder body, the concentricity of the sealing sleeve and the piston rod is guaranteed, the limiting bolt is changed from the axial direction to the radial direction to facilitate loosening and tightening, meanwhile, hard chromium plating treatment is conducted on the surface of the piston rod, abrasion resistance is improved, the size of the supporting sleeve is reset according to the actual situation, coaxiality is guaranteed, and vibration is reduced.

The invention relates to a display screen supporting plate and a preparation method thereof, a display screen assembly and electronic equipment. The display screen supporting plate is provided with a base body layer, the base body layer is provided with a first supporting face and a second supporting face which are oppositely arranged, and at least one of the first supporting face and the second supporting face is provided with a rigidity enhancing layer. The matrix layer is a titanium alloy layer or an aluminum alloy layer, and the rigid enhancement layer is a hard chromium layer; or, the matrix layer is a titanium alloy layer, and the rigid enhancement layer is a nitriding layer. The display screen supporting plate can meet the weight reduction requirement and the rigidity requirement.

Sleeves (402) that can be disposed on either end of a bushing (204) to improve the wear characteristics and usable lifetime of the bushing (204) is disclosed. During the use of the bushing (204), such as when a machine (100) including the bushing is operated, the sleeves (402) may be in primary contact with abrasive elements (e.g., other parts of the machine, dirt, rock, etc.) and wear, while the underlying bushing (204) is protected, at least in part, from wear and tear. The sleeves (402) may include a bulk material, such as steel, with a hard coating (412) thereon, such as hard chromium, tungsten carbide, or the like. The hard coating (412) may be formed by any variety of processes, such as electroplating, plasma deposition, thermal deposition, or the like. In some cases, the sleeves (402), after being worn from use, may be replaced or refurbished to further extend the lifetime of the bushing (204).