274 results about "Cemented carbide" patented technology

This invention discloses a deep-hole machining carbide end mill with a chip removal structure, applicable to the field of end mill technology. The invention uses an air blower at the bottom of the end mill component to blow outwards high-pressure gas, effectively reducing the impact of chips on the turning capability of the end mill component. A chip removal guide plate guides the high-pressure airflow, causing the high-pressure airflow to carry the turning chips upwards along the outer surface of the guide plate. Finally, the high-pressure airflow concentrates at the chip riser, increasing the airflow force and effectively increasing the blowing height of the turning chips, allowing them to exit the deep hole. Larger turning chips are retained on the inner surface of the chip removal guide plate, effectively preventing them from blocking the upward flow of high-pressure airflow and providing a stable retention environment for larger chips, thus effectively reducing the impact of larger turning chips on the drilling capability of the end mill.

1. The name of the design product: hard alloy tool bit (three blades). 2. The use of the design product: used on drill bit product, is the main component of drill bit. 3. The design points of the design product: in shape. 4. The picture or photo that best shows the design points: design 1 perspective view. 5. Design 1 is designated as the basic design.

This application belongs to the field of powder metallurgy technology, specifically a bicrystalline cemented carbide and its preparation method. The preparation method includes the following steps: mixing fine WC powder (2~4μm), Co powder, VC, and Cr3C2, followed by ball milling and spray granulation to obtain fine WC-Co composite powder; mixing coarse WC powder (8~12μm), Co powder, and ultrafine WC powder (0.15~0.25μm), followed by ball milling and spray granulation to obtain coarse WC-Co composite powder; and dry mixing, pressing, and sintering the fine WC-Co composite powder and the coarse WC-Co composite powder to obtain a bicrystalline cemented carbide with a Rockwell hardness of 87~90 HRA and a fracture toughness of 14~17 MPa·m. 1 / 2 The bending strength is 2500~3000MPa. This application prepares coarse and fine WC-Co composite powders separately, so that the inhibitor can effectively suppress the growth of fine WC grains during the sintering stage, while the ultrafine WC can promote the growth of coarse WC grains. This results in the prepared cemented carbide exhibiting a clear dual-scale WC grain distribution, while possessing both high hardness and high toughness. After dry mixing and pressing sintering, the prepared bicrystalline cemented carbide has high density.

The application discloses a ball milling method for electrolytically treated tungsten-containing hard alloy, and aims to solve the problems of large dust in dry ball milling process and large difference in physical and chemical indexes of recycled tungsten carbide powder. The ball milling method comprises the following steps: washing electrolytically treated tungsten-containing hard alloy blocks in pure water, then putting the washed tungsten-containing hard alloy blocks into a ball mill for wet ball milling, drying, and obtaining coarse tungsten carbide powder; reducing the coarse tungsten carbide powder at high temperature in an inert atmosphere; and airflow milling the high-temperature reduced coarse tungsten carbide powder to obtain tungsten carbide powder. The ball milling method for electrolytically treated tungsten-containing hard alloy provided by the application reduces the dust generation in the ball milling process by adopting the wet ball milling technology, combining with the optimized ball-to-material ratio, ball milling speed, ball milling time and solid content, and improves the working environment on site. By controlling the drying temperature, time and water content, and optimizing the reduction and airflow milling steps, the final product can have high purity, fine particle size and uniform particle size distribution, and the quality of the product is improved.

The present application relates to the technical field of hard alloy, in particular to a high wear-resistant and excellent anti-skid hard alloy stud and a preparation method thereof. In view of the early failure problem of the existing WC-Co stud caused by cobalt phase pool, uneven interface wetting and nail tip rounding under the alternating impact of ice-water-sand, the tungsten carbide powder is surface modified in dopamine-acrylic acid weak acid aerobic buffer solution, then five ethoxy tantalum and oxalic acid tantalum aqueous solution are introduced in sequence, the double tantalum precursor space preset structure is formed through coordination anchoring, aging and carboxyl adsorption, and then the structure is compounded with cobalt precursor and carbon black, and then the structure is pressed and sintered in sections, so that cobalt is preferentially limited in the interface area of tungsten carbide particles and a tantalum-rich carbide hardening layer is generated; the obtained stud can maintain high wear resistance while significantly inhibiting early rounding and micro-chipping, and has excellent grip stability on ice and wet road surface.

The disclosure provides a gradient structure cubic boron nitride composite sheet and a preparation method thereof. The gradient structure cubic boron nitride composite sheet consists of a cemented carbide substrate, a gradient transition layer, and a CBN layer from bottom to top. The gradient transition layer consists of N gradient layers, and the N is 4 to 18. From bottom to top, there are sequentially a first gradient layer, a second gradient layer, an Nth gradient layer, and so on. Any of the gradient layers consists of CBN and cemented carbide, in which the volume fraction of the cemented carbide in the Nth layer is 5 to 30% less than the volume fraction of the cemented carbide in the N−1th layer, and the volume fraction of the CBN in the Nth layer is 5 to 30% more than the volume fraction of the CBN in the N−1th layer.

This utility model discloses a polishing device for the cutting edge of cemented carbide tools, belonging to the field of tool grinding technology. It includes a base, a clamp fixedly connected to the top of the base, a support frame connected to the outside of the base, an air pump on the front of the support frame, a grinding plate on the base, a clamp slidably connected inside the base, a groove on the front of the base, and a reciprocating structure slidably connected within the groove. The reciprocating structure is connected to a filter plate, and a sleeve plate is connected to the outside of the base. This utility model, by setting up a reciprocating structure, a sleeve plate, a cam, and a filter plate, achieves the function of reciprocating movement of the filter plate in the horizontal direction on the base through the cooperation between the reciprocating structure, the cam, and the limiting post. The reciprocating motion mechanism provides a power source, driving the filter plate to periodically translate left and right, avoiding the accumulation of debris and clogging of the cam during the filtration process, thereby improving the subsequent filtration efficiency.

This invention belongs to the field of superhard material synthesis technology, specifically disclosing a high-temperature, high-pressure preparation method for nano-polycrystalline diamond with synergistic mechanical and thermal properties. The method includes the following steps: precursor preparation: pre-pressing the precursor in a cemented carbide mold; octahedral assembly; wrapping the pre-pressed sample with platinum foil and placing it at the center of the octahedron; high-temperature, high-pressure sintering; stopping heating after heat preservation, allowing it to cool naturally to 23-25°C, then depressurizing, removing the octahedral assembly and the platinum foil wrapping, thus obtaining the synergistically enhanced nano-polycrystalline diamond. This invention employs the above-mentioned high-temperature, high-pressure preparation method for nano-polycrystalline diamond with synergistic mechanical and thermal properties. By combining nanodiamond powder with graphene, the sample assembly is optimized, and nano-polycrystalline diamond samples with excellent mechanical properties and significantly improved thermal conductivity are synthesized under relatively mild temperature and pressure conditions.

This application relates to the field of superhard materials technology, specifically disclosing a method for preparing polycrystalline diamond composite sheets and their application in drill bits. The method for preparing the polycrystalline diamond composite sheet includes the following steps: S1, molding and sintering WC powder and Co to obtain a cemented carbide substrate; S2, grafting multi-walled carbon nanotubes with free radicals to obtain modified multi-walled carbon nanotubes; S3, surface-treating diamond micropowder to obtain modified diamond micropowder; S4, processing the modified diamond micropowder, modified multi-walled carbon nanotubes, N-rGO, Ti powder, etc., to obtain a powder, which is then combined with the cemented carbide substrate to obtain the polycrystalline diamond composite sheet. This application uses modified diamond and composite reinforcing phases to solve the problems of weak interfaces and thermal stress concentration within the polycrystalline diamond composite sheet, while simultaneously improving structural integrity and impact resistance at high temperatures.

The utility model discloses a kind of positioning groove plates for cementing hard alloy strip, it is related to hard alloy processing technical field, including workbench, the workbench bottom four corners are uniformly fixedly connected with supporting leg, the workbench top is slidably connected with iron tray, the iron tray is internally provided with mould, the mould both ends are fixedly connected with handle, the workbench top is provided with filling mechanism, the workbench top is provided with shaking mechanism.The utility model discloses a kind of positioning groove plates for cementing hard alloy strip, by filling mechanism, hard alloy strip is stirred using brush, hard alloy strip is filled into mould interior, avoids manual stirring filling, time-consuming and laborious and inconvenient.

This invention belongs to the field of surface strengthening technology, specifically relating to a composite coating resistant to cavitation and abrasion and its preparation method. The preparation method of the composite coating resistant to cavitation and abrasion provided by this invention includes the following steps: (1) preparing a high-elasticity alloy coating on the substrate surface using laser cladding technology; (2) preparing a hard alloy coating on the surface of the high-elasticity alloy coating using flame spraying; and (3) preparing a sealing protective layer on the surface of the hard alloy coating. This method uses laser cladding technology to achieve metallurgical bonding between the high-elasticity alloy coating and the substrate, improving the bonding force between the coating and the substrate, and also has high processing precision, maintaining high quality even for thinner coatings; the hard alloy coating formed by flame spraying has high hardness and good wear resistance, further improving the cavitation and abrasion resistance of the composite coating.

The application provides a high-performance bulletproof ceramic and a preparation method thereof, and the method comprises the following steps: preparing a hard alloy coating on a metal transition layer on the surface of a ceramic base by using a supersonic flame spraying method; then, a plurality of blind hole grooves arranged in a matrix interval are opened on the surface of the hard alloy coating by using a laser etching method; then, the blind hole grooves are filled with soft metal by using the supersonic flame spraying method; after the upper surface of the soft metal in each blind hole groove is polished to be flush with the upper surface of the hard alloy coating, a hard ceramic coating is prepared on the upper surface of the hard alloy coating and the soft metal by using an atmospheric plasma spraying method. The soft metal filled in each blind hole groove of the hard alloy coating captures the broken ceramic to achieve a secondary anti-penetration effect, and the soft area formed by the soft metal and the hard area formed by the hard alloy coating make the bullet body bear uneven stress to achieve the effect of deflecting the penetration path.

The application discloses a multi-blade hard alloy cutting tooth and application, which comprises a cylindrical base body, an upper outer cutting unit and a lower outer cutting unit are arranged on the outer wall of the cylindrical base body; an upper inner concave structure is arranged on the top surface of the cylindrical base body, and a lower inner concave structure is arranged on the bottom surface of the cylindrical base body; an upper inner cutting unit is arranged at the center of the upper inner concave structure, and a lower inner cutting unit is arranged at the center of the lower inner concave structure. The application realizes good cutting ability through a plurality of sharp cutting edges, improves stress concentration effect and thus improves cutting efficiency. The application is provided with the inner concave structure, so that the cutting tooth has good chip breaking capacity, can reduce the formation of long iron chips and prevent repeated crushing caused by the accumulation of iron chips at the bottom of the drill bit. The application can be mass-produced and avoids the unevenness of random broken hard alloy particles.

The application belongs to the technical field of powder metallurgy, and particularly discloses a nanoscale oxide particle dispersed aluminum-titanium target material and a preparation method and application thereof. x The nanoscale oxide particle dispersed aluminum-titanium target material has a double-layer structure, including a plated raw material layer and a base layer. x The plated raw material layer is composed of Al, Ti and MeO, wherein the mass percentage of Al and Ti accounts for 80-95%, and the mass percentage of MeO accounts for 5-20%; and the base layer is composed of Al and Ti or pure Al. The nanoscale oxide particle dispersed aluminum-titanium target material and the preparation method and application thereof have the advantages that the aluminum-titanium target material preparation process flow is simple, the production efficiency is high, the method is economic and environmentally friendly, and the method is suitable for batch production; the aluminum-titanium target material prepared by the method solves the binding problem of brittle target material, the target material has high density, meets the demand of hard alloy coating film plating, has no cracking problem in the plating process, and has high coating hardness and good wear resistance.

This invention belongs to the field of cemented carbide additive manufacturing technology and discloses a method for preparing a high-solids WC-Co water-based slurry for direct-write forming. The invention uses cobalt-coated tungsten carbide powder as the solid phase, which is dispersed in an aqueous solution of ammonium citrate and polyethylene glycol composite additives to obtain a WC-Co water-based slurry with a solid content of 90wt%~93wt%. The slurry of this invention exhibits good shear-thinning properties and extrusion shape retention, with a total dispersant dosage of only 1~1.2wt%. After direct-write 3D printing and debinding sintering, a density ≥99% and a Vickers hardness >1900HV can be obtained. 30 The complex structure of WC-Co cemented carbide components is suitable for the low-cost preparation of high-performance cemented carbide in industrial applications.

This application belongs to the technical field of cemented carbide materials, specifically a high-toughness WC-Co cemented carbide and its preparation method. The preparation method includes: using tungsten carbide powder, cobalt powder, tantalum carbide powder, boron source, and tungsten powder as raw materials; mixing and ball-milling all the boron source, tungsten powder, and part of the cobalt powder to obtain a first slurry; mixing and ball-milling all the tungsten carbide powder, tantalum carbide powder, and the remaining cobalt powder to obtain a second slurry; mixing the first slurry and the second slurry, ball-milling, drying, and pressing; and then sintering in three stages with increased temperature to obtain the WC-Co cemented carbide. This application, through the synergistic design of "pre-alloying wet milling" and "medium-temperature heat preservation," guides the uncontrollable boron diffusion reaction process into a directional and gradual reaction path of "B→Co2B→WCoB," thereby avoiding the formation of harmful phases such as brittle WB, optimizing the microstructure of the WC-Co cemented carbide, and improving its mechanical properties.

This invention discloses a cemented carbide matrix for diamond coating, its preparation method, and its application. The cemented carbide matrix for diamond coating, based on raw material mass, comprises 2%–12% binder phase, 0.06%–2% reinforcing phase, and the balance being a hard phase. The binder phase includes Co or Co+Ni, the reinforcing phase includes 0.05%–1.5% Cr and Ta, and optionally 0.005%–0.5% Me, wherein Me is selected from at least one of Nb, Ti, Mo, V, and Hf, and the hard phase includes WC with an average particle size of 0.1–1.3 μm. The relative magnetic saturation of the cemented carbide matrix is ​​78%–90%. The cemented carbide of this invention can better adapt to the corrosion-removal cobalt process of CVD diamond coating, and the prepared diamond-coated tools exhibit good performance in machining difficult-to-machine materials such as carbon fiber composites and graphite.

This invention relates to the field of high-performance ceramic material preparation technology, specifically an ultra-high pressure discharge plasma sintering system, comprising a six-sided press body, a high-power DC pulse power supply, and a high-pressure synthesis assembly block. The six-sided press body has a frame providing ultra-high pressure and a hydraulic drive system. Its six carbide hammers together form a cubic space for placing the high-pressure synthesis assembly block containing the sample. The two poles of the high-power DC pulse power supply are respectively connected to two upper and lower large pads through two conductive copper strips. The ends of the two large pads are fitted with steel rings, and the ends of the steel rings are embedded with carbide hammers. This ultra-high pressure discharge plasma sintering system achieves rapid and uniform bulk heating of the sample. The synergistic effect of the two systems enables the densification sintering preparation of ultra-hard ceramics at temperatures far lower than those of traditional high-temperature and high-pressure methods in a short time.

The utility model relates to hard alloy material heat treatment technical field, more specific is tungsten-containing titanium carbide hard alloy heat treatment device, including heat treatment box, the inside of heat treatment box is surrounded and is installed multiple electric heating roller I, is installed rotatable alloy positioning spare on the heat treatment box of multiple electric heating roller I inboard, the upper end of heat treatment box is covered with the box cover. Alloy insert fittings include motor through motor frame fixed connection at the bottom surface of heat treatment box, the output shaft of motor is connected with the pivot through the shaft coupling, the pivot rotation is connected in the bottom center position of heat treatment box, and the pivot is fixedly connected with the turntable, and two vertical frames are symmetrically fixed on the turntable in the inside of heat treatment box, and the inner positioning plate is fixed between two vertical frames, and multiple insertion holes are arranged around on the inner positioning plate. Advantageous effect is to make each alloy piece be in the state of mutual independence, can make each piece of alloy heat fully.

This invention discloses a BTA deep hole drill guide key and its preparation method, belonging to the field of deep hole machining tool technology. The guide key comprises an alloy steel substrate and a PCBN composite sheet fixed thereon. The PCBN composite sheet sequentially comprises a cemented carbide base layer, a gradient transition layer with progressively increasing CBN content, and a polycrystalline cubic boron nitride working layer. This invention also discloses the preparation method of the guide key and a BTA deep hole drill incorporating the guide key. This invention solves the problem of high thermal stress and easy cracking at the PCBN-cemented carbide interface through a gradient transition layer design. Applying the PCBN composite sheet to the guide key of the BTA deep hole drill significantly improves the wear resistance and service life of the guide key. In deep hole machining of difficult-to-machine materials, the guide key life is more than 15 times longer than traditional cemented carbide products. Simultaneously, it significantly improves drilling straightness and surface quality, reduces tool change downtime, and is suitable for high-speed cutting and deep hole machining of various difficult-to-machine materials.

This application discloses a high-carbon ultra-high hardness powder steel for stamping and its preparation method. The powder steel has the following mass fractions of elements: C 3.2~4.0%, Si 0.5~1.0%, Mn 0.2~0.5%, P≤0.020%, S≤0.0030%, Ni≤0.5%, Cr 3.8~4.8%, Mo 4.5~5.8%, W 8.0~10.0%, V 9.3~11.3%, Co 8.2~9.2%, Al 0.015~0.04%, H≤0.0001%, with the remainder being Fe. The resulting powder steel has a uniform carbide distribution. By employing gradient vacuum quenching and cyclic deep cryogenic processes, the hardness after heat treatment can reach 72~74HRC, with low residual austenite content, exceeding the hardness of existing powder steel heat treatment. This improves the service life of stamping dies. It can achieve a hardness close to that of some cemented carbides, but with much higher toughness. The cost is significantly lower than that of cemented carbides. During the stamping process, the die is less prone to chipping and has better stability.

The application belongs to the technical field of hard alloy, and particularly relates to high-performance hard alloy with dispersed and uniform tantalum carbide and a preparation method thereof. The preparation method comprises the following steps: adding potassium fluotantalate solution into a cobalt-nickel solution; adjusting the pH of the solution to make cobalt, nickel and tantalum completely precipitate, and then filtering, washing with water and drying to obtain cobalt-nickel-tantalum precursors; then reducing, crushing and sieving to obtain precursor powder; mixing the precursor powder with carbon black, tungsten carbide and paraffin, and then wet ball-milling, spray granulating, preparing a compact and sintering to obtain high-performance hard alloy. By adding nickel element, using a liquid-liquid mixing method and reducing, superfine cobalt-nickel solid solution powder is obtained, which can improve the toughness of the alloy; the conversion of tantalum is completed in the sintering process, which is beneficial to the dispersion of tantalum and the strengthening of the alloy performance, improves the solid solution amount of tantalum in cobalt-nickel, inhibits the sintering growth of WC, and improves the hardness and wear resistance of the alloy.

The present application belongs to the machining process, and particularly relates to a process method for machining a precision reference surface of a folding joint. First, the deformation amount of a part clamping is controlled, semi-finishing of the precision reference surface is carried out, and then the part semi-finishing is carried out. The paddle pin hole is machined by using a whole hard alloy cutter, and a single side has a margin. Finally, the precision reference surface of the folding joint is finished by fixing and clamping the paddle pin hole, so that the flatness is not greater than 0.03 mm. The deformation amount of the folding joint clamping is quantitatively controlled in the whole process, the operation is simple and clear, the process is accurate and controllable, and the result is convenient to measure. The flatness of the precision reference surface of the folding joint is not greater than 0.03 mm, that is, the deformation amount of the clamping in the first front face finishing is effectively controlled. The machining quality of the first front face finishing is ensured, and then the machining quality of the second back face finishing is ensured, so that all the sizes of the folding joint completely meet the requirements of the design drawing. The machining method can be referred to for other similar folding joint parts.

This invention discloses a two-step oscillating hot-pressing sintering method for WC-Co cemented carbide. Specifically, the method involves: loading WC-Co cemented carbide mixed powder into a mold and pre-pressing it; firstly, holding the powder at 800°C in a vacuum environment to degas and pre-sinter the billet; then applying unidirectional oscillating pressure to the billet through the mold and raising the temperature to 1100°C for solid-state sintering. Dynamic pressure causes WC particles to rearrange, and Co particles undergo severe plastic deformation under the pressure of the WC particles, further increasing the relative density of the billet; finally, the temperature is raised to 1300-1350°C to form a WC-Co eutectic liquid phase. Dynamic pressure drives further particle rearrangement, and the eutectic liquid phase uniformly fills the gaps between WC particles, completing the sintering process. This invention improves the three-dimensional spatial distribution uniformity of the Co phase, eliminates residual porosity, effectively inhibits abnormal growth of WC grains, and produces cemented carbide with excellent strength and toughness.

The application relates to a preparation method of a low-oxygen heterogeneous structure tungsten-based composite material, and relates to the technical field of tungsten-based composite material preparation. W powder, Ti powder, TiB2 powder and WC hard alloy balls are loaded into a ball mill tank for ball milling; then a two-step sintering method is adopted to prepare W-Ti-TiB2 tungsten-based composite material with high hardness and low oxygen content. The relative density of the prepared W-Ti-TiB2 tungsten-based composite material reaches 92.0% or more, and the microhardness value is 425-530 HV, which is superior to that of pure tungsten material (microhardness 360-420 HV). The oxygen content (20-80 ppm) of the prepared new heterogeneous structure W-Ti-TiB2 tungsten-based composite material is lower than that of pure tungsten (70-180 ppm) prepared by the same process and W-Ti-TiB2 tungsten-based composite material (150-380 ppm) prepared by the same process but with different powder loading sequences.

This invention belongs to the field of powder metallurgy technology, specifically relating to a high-hardness, low-expansion, and low-oxidation cemented carbide and its preparation method. Doping is achieved through liquid mixing-evaporation crystallization, with precise control of the dopant element content achieved by coordinating temperature and pH control of the crystallization mother liquor. Furthermore, ball milling is eliminated, allowing the incorporated cobalt and chromium to undergo intermolecular mixing, which not only improves doping efficiency but also reduces impurities introduced by ball milling, ensuring the cemented carbide's low expansion coefficient and low oxidation increment. The powder is stored and mixed in a nitrogen atmosphere and at low temperature, reducing the probability of spontaneous combustion and ensuring production safety. Reduction carbonization using a nitrogen and hydrogen mixture not only promotes rapid one-step carbonization but also, by increasing the nitrogen flow rate, promptly removes the water vapor generated during reduction, reducing the risk of powder growth and ensuring the hardness of the cemented carbide.

An apparatus for forming a cladding layer on a surface of a component, characterized by a preheating section for preheating a filler material composed of a cemented carbide in a rod shape to a softening temperature, a heat source for applying heat for forming a molten pool to the surface of the component, and a delivery section for delivering the preheated filler material to the molten pool, the filler material being delivered in a softened state without being molten before being delivered into the molten pool. A method for forming a cladding layer on a surface of a component, comprising providing a filler material composed of a cemented carbide in a rod shape, softening the filler material composed of a cemented carbide in a rod shape, heating the surface of the component to generate a molten pool on the surface of the component, and delivering the filler material in a softened state without being molten before being delivered into the molten pool.

The application discloses a turning tool for efficiently utilizing C-type hard alloy blades, which comprises a clamping sleeve and a main tool body, wherein the main tool body is connected with a lathe through the clamping sleeve; the tool head of the main tool body is respectively provided with an outer diameter turning blade, an end face turning blade and an inner hole turning blade; the outer diameter turning blade and the inner hole turning blade are arranged on the two sides of the tool head, and the end face turning blade is arranged on the front of the tool head; the outer diameter turning blade and the end face turning blade adopt 100° auxiliary cutting edges of C-type hard alloy blades; the inner hole turning blade adopts 80° main cutting edges of C-type hard alloy blades; the application has the advantages that single-piece blades are fully utilized, the service life and the machining efficiency of the blades are remarkably improved, the tool changing frequency is reduced, the safety under heavy cutting conditions is enhanced, and the application is suitable for multi-process composite machining scenes.