3112 results about "Cemented carbide" patented technology

The invention relates to the technical field of machining, and discloses a hard alloy discrete element parameter calibration method based on a BP neural network, and the method comprises the following steps: constructing a discrete element constitutive model according to material physical property parameters; setting to-be-calibrated parameters and ranges; performing combination experiment design (DOE) according to the to-be-calibrated parameters and the range; the DOE is combined with an experiment design result to serve as input data to be imported into the discrete element constitutive model for discrete element simulation; enough training samples are obtained; establishing a training set by data; obtaining an approximate model between the to-be-calibrated parameter and the output data simulated by the discrete element; and calibrating to-be-calibrated parameters by taking the actual mechanical property as a target, and then comparing a simulation result with a physical test result. According to the technical scheme, the problems that existing hard alloy particle parameters are high in acquisition difficulty and low in measurement precision are solved, and an effective technical means is provided for determining the BPM bond key parameters in the hard alloy particle numerical simulation test.

The invention discloses a high-entropy alloy bonding phase SiC hard composite material and a preparation method thereof, the SiC hard alloy composite material is a double-phase composite material and comprises SiC and high-entropy alloy, and the high-entropy alloy is AlMnCuiFeTi and AlZnCuFeTi. The proportion of the raw materials is 5 wt.%-20 wt.%. And the size of the SiC particles is 200 [mu] m. During preparation, firstly, the high-entropy alloy is prepared through mechanical alloying; after uniform mixing, a graphite mold is filled with the mixture for prepressing, the prepressing pressure is 10-50 MPa, and prepressing is conducted for 10-30 s; and then hot pressed sintering is carried out, the sintering pressure is 20-50 MPa, the sintering temperature is 1400-2000 DEG C, heat preservation is carried out for 10-90 min, and the high-entropy alloy bonding phase SiC hard alloy composite material is prepared. The liquid phase generated in the high-entropy alloy sintering process is used for reducing the sintering temperature, the organization structure is improved, and the hardness and toughness of the tungsten carbide hard alloy are improved.

An ultrafine grain cemented carbide additive manufacturing method. WC-Co is used as a raw material, a crystal grain growth inhibitor is added, and a rare earth oxide is added as a reinforcing phase; paraffin and a trace amount of low-valence rare earth oxide powder are added, ball milling is carried out for coating cemented carbide powder, and oxygen control is carried out; the cemented carbide powder obtained by ball milling and an organic adhesive are loaded in a vacuum banbury mixer-granulator to prepare a printing feed, then a green body is printed using fused deposition modeling (FDM), and finally, degreasing and two-step sintering are carried out on the green body to prepare ultrafine cemented carbide. By means of the combined effect of the components and process optimization design, the powder properties are regulated, the process range of vacuum banburying and granulation and additive manufacturing is widened, and the problems of pores, interlayer cracks, and oxygen absorption in a printed green body, and abnormal grain growth, oxidation decarburization, and the formation of brittle η-phase in a sintered sample are solved. The prepared ultrafine grain cemented carbide exhibits high relative density, is free of metallurgical defects, possesses excellent mechanical properties, and is suitable for large-scale and mass production.

The invention relates to the technical field of hard alloy tool bit machining, in particular to a hard alloy tool bit performance detection device which comprises a fixing mechanism, a wear resistance detection mechanism and a bending resistance detection mechanism, the wear resistance detection mechanism and the bending resistance detection mechanism are mounted on the fixing mechanism, and the fixing mechanism comprises a bottom table, a support and a fixing assembly, and the support and the fixing assembly are mounted on the bottom table. The alloy tool bit is primarily clamped and fixed through the clamping part, and when the first hydraulic push rod pushes the connecting disc to move rightwards to conduct friction testing on the alloy tool bit, the pushing rod is used for pushing the clamping part to conduct secondary clamping and fixing on the testing end of the alloy tool bit; and then the pushing rod and the hollow circular ring are connected and locked through the connecting part, and through linkage matching of the hollow circular ring, the clamping part, the pushing rod and the connecting part, the relative stability of the friction block and the alloy tool bit during detection is improved, and then the detection accuracy is improved.

The invention relates to the technical field of material science, in particular to a high-strength hard alloy and a preparation method and application thereof.The preparation method comprises the following steps that S1, raw materials of tungsten carbide, cobalt, tantalum carbide, niobium carbide, titanium carbide, yttrium oxide, nickel and trace strengthening elements are weighed according to the preset weight, and a mixture A is formed; s2, placing the mixture A in wet ball-milling equipment for ball-milling treatment; s3, the slurry obtained after ball milling is subjected to drying treatment; s4, carrying out plasma activation treatment on the dried powder; s5, pressing the activated powder to form a compact green body; s6, the green body is subjected to second-stage sintering treatment in a vacuum sintering furnace; s7, after sintering is completed, cooling treatment is conducted; by optimizing the alloy formula and innovating the preparation process, the hardness, toughness and high-temperature resistance of the high-strength hard alloy are improved, meanwhile, the production process is simplified, and the overall performance and application universality of the material are improved.

The invention provides a high-performance nitrogen-containing hard alloy material based on a vanadium-titanium rare earth carbonitride solid solution and a preparation method of the high-performance nitrogen-containing hard alloy material, and belongs to the technical field of hard alloy cutting tool materials. Tungsten carbide of a hard phase is modified, meanwhile, the vanadium-titanium rare earth carbonitride solid solution and the boron quantum dot are introduced to modify the high-entropy alloy, through interaction of modified components, the hardness and transverse breaking strength of the hard alloy material are effectively improved, and meanwhile the phase granularity is reduced.

The invention relates to the technical field of alloy materials, and discloses a preparation method of a nano WC-Co hard alloy for micro drilling, the nano WC-Co hard alloy comprises the following raw materials by weight: 83-92 wt% of nano tungsten carbide, 7-17 wt% of ultrafine cobalt oxide powder, 0-1.5 wt% of a hard alloy grain growth inhibitor, and 0.2-3 wt% of a forming agent; the method comprises the following steps: 1, mixing nano tungsten carbide, superfine cobalt oxide powder, vanadium carbide and a forming agent, and adjusting a carbon balance point in the powder to be mixed by using free carbon black; 2, sequentially putting the powder and a forming agent into a ball mill, and mixing the materials by taking absolute ethyl alcohol as a ball milling medium; the superfine cobalt oxide powder is used for replacing superfine cobalt powder, so that the extension area of cobalt element powder is increased, the problem that the cobalt powder is extended into a sheet shape is avoided, the cobalt pool phenomenon is effectively reduced, meanwhile, crystal grain growth inhibition carbides are increased, the phenomenon that a binding phase in hard alloy is not uniform is avoided, the service life of the finished micro-small-diameter drill bit special for the PCB is guaranteed, and the service life of the finished micro-small-diameter drill bit special for the PCB is prolonged. And the product quality is further improved.

The invention provides a surface cubic-phase-rich functional modified hard alloy and a preparation method, and belongs to the technical field of hard alloy cutter materials. According to the method, tungsten carbide is subjected to yttrium doping treatment, boron-containing titanium carbide and cobalt-molybdenum composite powder are used together, a nitriding sintering process is combined, diffusion and permeation of nitrogen atoms are promoted, the microstructure of the alloy is regulated and controlled, enrichment of a cubic phase on the surface of the alloy is achieved, and the surface-rich cubic phase functional modified hard alloy is obtained; the Vickers hardness and the heat conductivity coefficient of the hard alloy material are effectively improved, and meanwhile the friction coefficient of the material is reduced; the surface layer rich cubic phase of the modified hard alloy material is provided with the functional gradient layer, the binding force of a coating of a tool material prepared from the modified hard alloy material and a matrix can be improved, and therefore the service life of the tool material is prolonged.

A tool includes a cemented carbide part and a maraging steel part, wherein the two parts are joined by brazing. The cemented carbide part has a hard phase embedded in a metallic binder phase matrix. The maraging steel part has a hardness of between 350 and 600 HV1 with a standard deviation between 0 and 20 HV1. A method of making such tool is also provided.

The present invention discloses a bionic swallowtail-shaped micro-textured tool and a preparation method thereof, belonging to the technical field of metal cutting tools. The preparation method is based on a cemented carbide tool substrate, and combines the structural advantages of the swallowtail structure in reducing frictional resistance and accelerating the flow of gas and liquid. On this basis, a corresponding functional tool is prepared by machining a bionic swallowtail-shaped groove and surface texture. The designed tool groove is used to discharge chips and store and convey cutting fluid; the surface texture is used to reduce the frictional force between the chip and the tool during cutting and promote the discharge of chips, thereby reducing the cutting force, improving the tool life and processing efficiency. Compared with the prior art, based on the bionic principle, the present invention combines the tool groove and the surface texture to design and prepare a functional tool, achieving the functional requirements of improving the heat resistance and wear resistance of the tool, prolonging the tool life, reducing the production and processing cost, and realizing green processing, and meeting the production and processing needs.

The present invention relates to the technical field of cemented carbide processing, specifically to a cemented carbide workpiece production stacking mechanism, including a stacking rack, a conveyor belt, a guide rail rack, a rack locking member for locking the stacking rack, and a positioning adjustment mechanism for driving the stacking rack to rise and fall, two symmetrically arranged conveying rollers are installed on the conveyor belt, the stacking rack is provided with a plurality of bearing plates from bottom to top, the stacking rack is provided with an angle adjustment mechanism, the middle part of the conveyor belt is provided with an auxiliary roller, one end of the auxiliary roller is provided with a first sprocket, one end of one of the conveying rollers is provided with a second sprocket, two baffles are provided on the top of the conveyor belt, a limited conveying interval is formed between the two baffles, the head end of the baffle is provided with a centering guide plate, the middle part of the conveyor belt is provided with a material blocking mechanism, one side of the conveyor belt is provided with a pushing mechanism, and the tail end of the conveyor belt is provided with a guiding mechanism. The present invention realizes that the blank plate is automatically arranged on the conveyor belt at equal intervals, thereby improving the processing quality.

The invention discloses a rare earth oxide modified high-entropy hard alloy and a preparation method thereof. A high-entropy hard phase (high-temperature calcination), a high-entropy binding phase and rare earth oxide are adopted, grinding, pressing and air pressure sintering at the temperature of 1450-1550 DEG C are conducted, and the high-entropy hard phase is prepared from tungsten carbide, titanium carbide, zirconium carbide, yttrium carbide, manganese carbide, chromium carbide and molybdenum carbide; the high-entropy binding phase comprises the following components: cobalt and a CoCrFeNi-series high-entropy alloy; and the component of the rare earth oxide is Y2O3 or Nd2O3. The prepared rare earth oxide modified high-entropy hard alloy has the advantages of high strength, high compactness, high hardness, high wear resistance and the like.

The invention belongs to the field of metal materials, and provides a hard alloy wear-resistant steel ball suitable for mine ore grinding and a preparation method thereof.The hard alloy wear-resistant steel ball is prepared from waste steel pig iron as a basic raw material and chemical components including 2.1%-2.2% of C, 9.8%-10.0% of Cr, 0.10%-0.20% of V and 0.03%-0.06% of Ti; a core-shell precipitated phase microstructure design with MN / MCN as a hard core and chromium carbonitride as a gradient self-passivation shell layer is formed through medium-frequency induction furnace smelting, controlled nitrogen introduction establishment of a V-Ti-C-N microalloy system, bottom pouring solidification and austenitizing quenching and tempering heat treatment processes, and the performance indexes that the surface hardness is HRC60-63 and the core hardness is HRC54-58 are achieved; the average particle size of a core-shell precipitated phase is in dispersed distribution of 20-200nm, the shell thickness is 5-50nm, and the alloy steel ball has excellent wear resistance and corrosion resistance under the high-impact and high-wear working conditions of wet ore grinding, solves the problem of insufficient wear resistance and corrosion resistance of a traditional alloy steel ball, and has wide mine ore grinding application value.

The invention discloses a high-hardness tungsten carbide-cobalt hard alloy and a preparation method thereof. A production raw material formula comprises the following components in parts by mass: 100 parts of tungsten carbide powder, 6-20 parts of cobalt powder, 0.2-1.3 parts of a composite sintering aid, 0.5-4 parts of a wet grinding medium and 0.2-4 parts of a forming agent, the composite sintering aid is composed of rare earth oxide and cobalt phosphide according to the mass ratio of (1-5): 1. The method has the advantages that on the premise that the toughness of the tungsten carbide-cobalt hard alloy is slightly improved, the hardness and wear resistance of the alloy are remarkably improved, and the industrial problems that the hardness improvement of the tungsten carbide-cobalt hard alloy with a single sintering aid is limited and the toughness of the alloy is lost are solved.

The utility model relates to a directional drainage diamond compact and a PDC drill bit, the directional drainage diamond compact comprises a hard alloy matrix and a diamond composite layer, the diamond composite layer is arranged at one end of the hard alloy matrix, and the diamond composite layer and the hard alloy matrix are connected into a whole; a jet hole penetrating through the hard alloy matrix and the diamond composite layer is axially formed in the diamond composite sheet; a drainage groove communicated with the jet flow hole and extending in the radial direction is formed in the end, away from the hard alloy base body, of the diamond composite layer. According to the directional drainage diamond compact, the drainage grooves can jet in the cutting direction to assist in cutting, the cutting efficiency is improved, meanwhile, the liquid column pressure of the stratum near the cutting teeth can be reduced, the compaction strength of rock is reduced, and the cutting efficiency is further improved. The liquid sprayed out of the jet holes is closer to the cutting edge part, heat generated when the clad sheet cuts the stratum can be taken away more effectively, thermal abrasion caused by overheating of the clad sheet is prevented, and the service life of the clad sheet is prolonged.

The utility model belongs to the technical field of control valves, and discloses a novel valve seat sleeve of a large-pressure-difference regulating valve, which comprises a regulating valve seat body, an anti-erosion WC (Wolfram Carbide) valve seat sleeve, a compression valve seat sleeve nut and a positioning screw. On the basis of keeping the function of the original valve seat sleeve, the WC hard alloy valve seat sleeve is embedded on the valve seat body, so that the problems of valve seat cavitation, scouring and abrasion failure caused by the use environment of a control valve adjusting core component are solved under the condition of reducing the use amount, the service life of the core component is prolonged, and the service life of the core component is prolonged. And long-period, safe and reliable operation of core components in an application environment is ensured.

The invention relates to the technical field of cutting tool materials, and discloses a hard alloy applied to a cutting tool and a preparation method thereof.The hard alloy is prepared from, by weight, 70-80 parts of tungsten carbide powder, 5-10 parts of cobalt powder, 2-6 parts of copper powder, 1-5 parts of silver powder, 0.2-0.5 part of tantalum carbide powder, 0.2-0.5 part of titanium carbide powder and 0.1-0.3 part of nickel powder, and the particle size of all the components is smaller than 10 micrometers. The copper powder and the silver powder are added into the raw materials, half of the silver powder is ground to be finer in particle size in the production process, the silver powder is evenly mixed with other powder, the mixture is pressed into a blank through a mold, and after sintering is conducted, copper and silver elements can be evenly distributed on the inner layer and the outer layer of the hard alloy; by means of the excellent heat conduction effect of copper and silver, heat generated when the cutting tool made of the hard alloy is used can be well carried away by cutting fluid, abrasion of the tool is reduced, and the service life of the tool is prolonged.

The invention relates to the field of hard alloy, and provides hard alloy, a preparation method thereof and application of the hard alloy in a hard alloy cutter. The hard alloy comprises the following components in every 100 parts by mass: 8-15 parts of a binder; the conditioning agent is prepared from vanadium carbide, ruthenium and tantalum carbide according to the mass ratio of (1 to 6) to (5 to 8) to 10; and the balance of tungsten carbide. The preparation method comprises the following steps: ball milling, drying and granulating, compression molding and hydrogen sintering. The hard alloy with excellent strength and toughness is obtained by optimizing the components and limiting the dosage of each component, and the service life is long when the hard alloy is applied to a blade.

The invention relates to the field of cutter coatings, and provides a coated hard alloy cutter aiming at the problem that the mechanical property of the cutter is influenced by poor binding force between the coating and a substrate, the cutter substrate is tungsten carbide-based hard alloy, and the hard alloy contains VC, Ru and TaC; and the coating sequentially comprises a molybdenum sulfide layer, an aluminum nitride layer and an aluminum titanium silicon nitride layer from inside to outside. By limiting the components of the cutter base body and the sequence and components of the multi-element coating, the cutter with good binding force between the coating and the base body and long service life is obtained.

The invention relates to the technical field of powder metallurgy, and particularly discloses an ultra-coarse grain WC-Co hard alloy and a preparation method thereof.The preparation method comprises the following steps that S1, the following raw materials including, by weight, 4.6-9.2 parts of cobalt powder, 96-102 parts of coarse grain tungsten carbide powder, 3.6-5.2 parts of functional gel, 3.4-4.6 parts of modified penetration enhancer, 2.2-2.8 parts of binder and 36-62 parts of organic solvent are prepared; step S2, preparation of a mixture; step S3, carrying out granulation treatment; step S4, compacting; step S5, pressurizing and sintering; the functional gel and the modified penetration enhancer are added, the functional gel contains yttrium oxide, polytannic acid, ultrafine tungsten carbide, tantalum carbide, chromium carbide, silica gel and other components, and the functional gel not only has excellent physical properties, but also can be cross-linked with the modified penetration enhancer to form a more compact silicon dioxide network structure; and the hardness, toughness, impact resistance and wear resistance of the alloy are improved.

The invention relates to a milling burr (1) for an electrically or pneumatically operated hand-held tool for deburring, shaping, grinding and finishing iron-free surfaces, comprising: - a shank portion (2) and - a milling portion (4) made of a hard metal, in particular tungsten carbide, which adjoins the shank portion (2) and ends in a milling tip (6), wherein the milling portion (4) has a milling length (f) and a plurality of cutting edges (10) which are separated by mutually spaced main flutes (14) which have a main flute depth (h) and extend helically in a first twist direction (16) with a first twist angle (α) along the milling length (f), wherein each of the cutting edges (10) has a rake face (20) and a relief face (24) and a cutting edge (12) at the transition of rake face (20) and relief face (24), forming a rake angle (γ) and a relief angle (δ). The milling burr (1) according to the invention is characterized in that said relief face (24) is a first relief face (24) and said relief angle (δ) is a first relief angle (δ), wherein the first relief face (24) is adjoined in the circumferential direction of the milling portion (4) by a second relief face (26) which extends at a second relief angle (ε), and, in the region of the milling portion (4) with the largest diameter, the first relief angle (δ) is in the range from 6° to 20° and the second relief angle (ε) is in the range from 8° to 30°, and the second relief angle (ε) is greater than the first relief angle (δ). The invention also relates to the use of such a milling burr (1).

The invention relates to the technical field of composite resin preparation, and discloses a silicon-molybdenum alloy target material preparation method which comprises the following steps: preparing raw materials, selecting molybdenum powder and silicon powder with the purity not lower than 99.9%, mixing, putting the raw materials into a vacuum mixer, vacuumizing to 0.01-0.1 Pa, stirring for 1-5 hours, carrying out ultrasonic assistance, controlling the temperature to 25-40 DEG C to prevent oxidation, and carrying out a forming process. Filling the mixed powder into a detachable hard alloy mold coated with a 0.05-0.2 mm boron nitride coating, carrying out cold press molding, maintaining the pressure for 5-20 minutes to obtain a biscuit, sintering, putting the biscuit into a vacuum sintering furnace, firstly carrying out microwave-assisted heating, then raising the temperature to 1500-1800 DEG C, introducing trace argon in the later period to regulate and control a structure, carrying out a post-treatment process, carrying out numerical control processing on a sintered target material, carrying out chemical cleaning on the mixed solution of hydrofluoric acid and nitric acid, and finally carrying out vacuum sintering. Performing plasma treatment; and finally, performing vacuum packaging and filling high-purity nitrogen. The raw materials are high in purity and excellent in granularity; uniformly mixing and preventing oxidation; forming and sintering are precisely controlled, and the quality of the target material is guaranteed; the surface performance is improved through post-treatment, packaging is oxygen-proof and moisture-proof, and the target material meets the high-end industry requirement.

The invention discloses a ceramic bonded WC hard alloy and a preparation method thereof, WC hard alloy powder is prepared from W powder, Ti powder, Zr powder and C powder, the mass fraction of the W powder is 85-90 wt.%, the mass fraction of the Ti powder is 2-2.5 wt.%, the mass fraction of the Zr powder is 4-4.5 wt.%, and the mass fraction of the C powder is 6-6.5 wt.%. The W powder, the Ti powder, the Zr powder and the C powder are mixed in a mechanical alloying (MA) mode through a one-step method, the novel high-entropy ceramic combined WC hard alloy composite material is prepared through the SPS sintering technology, the sintering temperature is reduced through vacancy energy in a system, sintering is promoted, introduction of oxygen is reduced, the hardness, fracture toughness, corrosion resistance and other performance of a sintered body are improved, and the service life of the high-entropy ceramic combined WC hard alloy composite material is prolonged. Meanwhile, the technological process is simplified, and the production cost of the hard alloy material is reduced.

The invention discloses a brazing method for improving the welding strength of a polycrystalline diamond cutter and a hard alloy. The brazing method comprises the following steps that S1, brazing filler metal alloying is conducted; and S2, the PCD tool bit and the hard alloy matrix are subjected to vacuum brazing. According to the brazing filler metal, an Ag-Cu-Co system is adopted, Ag mainly plays a role of a solder matrix and provides plasticity and thermal conductivity, Cu mainly plays a role of forming an eutectic structure with Ag and reducing the melting point, and Co mainly plays a role of wetting the surfaces of PCD and hard alloy. Co infiltration is adopted in the preparation process of the PCD tool bit used in the method, so that a certain amount of Co exists on the PCD surface, and the hard alloy tool body also contains Co, and therefore, a small amount of Co in the brazing filler metal can better wet the welding surface according to the similar intermiscible principle. In the vacuum brazing process, additional pressure does not need to be applied, when the brazing filler metal is molten, the brazing filler metal is evenly laid on the welding face under the action of the pressure of the PCD tool bit on the upper portion and the capillary effect, the redundant brazing filler metal can flow out of the two sides of the mold, and the flatness of the welding surface can be effectively guaranteed.

The invention relates to the technical field of brazing, in particular to a metal wetting behavior regulation and control system and method in the vacuum brazing process. The pretreated hard alloy, the pretreated base body and the pretreated mixed brazing filler metal are loaded into a vacuum brazing furnace, a heating and temperature control system is started, and heating is conducted according to a preset heating curve; in the heating process, according to a feedback result monitored in real time, the wetting behavior of the brazing filler metal is regulated and controlled; and the heating system is closed, so that the brazed part is naturally cooled in the vacuum environment. The hard alloy and the substrate are subjected to surface pretreatment, so that surface oxides, oil stains and other impurities are effectively removed, the wettability of the surface of the substrate is improved, and favorable conditions are provided for uniform wetting of the brazing filler metal. And a proper amount of active elements are added into the prepared mixed brazing filler metal, so that the wettability of the brazing filler metal on the hard alloy is improved. Therefore, the problem that metal wetting is not uniform in the traditional vacuum brazing process is solved.

The invention relates to the technical field of powder metallurgy, and discloses a preparation method of a wear-resistant nano WC hard alloy, which comprises the following steps: S1, WC powder, Co powder and CoCrFeNi high-entropy alloy powder prepared by a mechanical alloying method are uniformly mixed through acoustic resonance to obtain hard alloy powder; and S2, the evenly-mixed hard alloy powder is loaded into a graphite mold, two-step heating type spark plasma sintering is carried out after prepressing is carried out, and after heat preservation is finished, furnace cooling can be carried out, and the wear-resistant nano WC hard alloy can be obtained. Aiming at the contradiction between high hardness and low toughness of the metastable state nano WC hard alloy, the toughness of the material is improved by adding CoCrFeNi of a single-phase FCC structure with more slippage systems, and the phenomena of extrusion deformation, cracking and structural layering of the material are avoided; the reasonable material pore design reduces secondary abrasion of abrasive dust to the surface of the material, the abrasion of the surface of the material can be remarkably reduced by combining dispersion strengthening of superhard Cr2O3 particles generated in the material, and the purpose of remarkably improving the abrasion resistance of the material is achieved.

The invention discloses a temper mill bottom plate machining method which comprises the following specific steps that S100, appearance inspection is conducted on a bottom plate blank, and whether cracks and sand hole defects exist on the surface or not is checked; proper machining allowance is reserved according to the design size of the bottom plate; s200, a horizontal boring and milling machine is adopted, a hard alloy cutter is selected, and rough machining is conducted on the base plate blank in a multi-cutter and multi-blade milling mode; s300, the base plate obtained after rough machining is placed in an aging treatment furnace, the temperature is increased to 550-600 DEG C at the speed of 50-60 DEG C per hour, heat preservation is conducted for 4-6 hours, then the base plate is slowly cooled to the room temperature at the speed of 30-40 DEG C per hour, and therefore internal stress generated by rough machining is eliminated; s400, a horizontal boring and milling machine is adopted for conducting semi-finish machining on the bottom plate subjected to aging treatment; s500, carrying out vibration aging treatment on the semi-finished bottom plate by adopting vibration aging equipment; and S600, a high-precision numerical control grinding machine and a boring and milling machine are adopted for conducting finish machining on the bottom plate subjected to vibration aging treatment.

The present invention relates to a coated cutting tool (1) for metal machining comprising a cemented carbide substrate body (5) and a coating (6) comprising a layer of a metal nitride, there is an uppermost part of the cemented carbide substrate body (5) wherein there are uppermost WC grains adjacent to the coating (6), there is an intermediate zone between an uppermost part of said WC grains and the coating (6) comprising a peak of Me3 intensity in an EDX line scan made from within the coating (6) into a WC grain perpendicular to the surface plane of the WC grain, Me3 is one of Ti, Cr, Zr, Mo, Nb and V, the average content of Me3 within + / - 10 nm from the Me3 max peak position is from 2 to 30 at%, the Me3 within + / - 1.0 nm from the Me3 max peak position in the EDX line scan is present as a metal nitride or carbonitride, the average content of any noble gas element or combination of noble gas elements, within + / - 1.0 nm from the Me3 max peak position in the EDX line scan, is ≤0.6 at%.

The invention discloses a preparation method of a superfine WC-Co hard alloy. 89.8-90% wt of superfine tungsten carbide, 9% wt of superfine Co powder and 1-1.2% wt of composite additive chromium carbide and vanadium carbide are adopted; wherein the weight ratio of chromium carbide to vanadium carbide is 1 / 2; ball-milling the raw materials to obtain a mixture; and the pressed blank is subjected to a specific oscillation pressure and rapid cooling sintering process, the contact form and interface state among particles are improved, the density of the hard alloy is improved, WC grain growth is inhibited, flowing of binding phase Co is promoted, the structure and mechanical properties of the alloy are remarkably improved, and the nanocrystalline WC-Co hard alloy with high strength and high density is obtained.

A fluid end made of a plurality of fluid end sections positioned in a side-by-side relationship. Each fluid end section is made of a housing having a discharge bore and an intake bore formed therein. A fluid routing plug is installed within each housing and is configured to route fluid throughout the housing and between the discharge and intake bores. The fluid routing plug carries seals that engage sealing surfaces formed within the housing. A number of features, including the location of seals within bore walls and carbide inserts within valve guides, aid in reducing or transferring wear within each housing.