2236 results about "Powder metallurgy" patented technology

The invention discloses a powder metallurgy gear hardness detection method and system, and belongs to the technical field of metallurgy gears, and the method comprises the steps: obtaining a to-be-detected gear three-dimensional model, and dividing a hardness evaluation region; a thermal response image is collected, a thermal response time gradient parameter TRTG is extracted, and a thermal diffusion characteristic matrix T is formed; establishing a hardness initial model H1 based on the TRTG and compactness; constructing a finite element stress field model, extracting a stress distribution modulation coefficient SDMC, and forming a stress characteristic matrix S; performing weighted correction on H1 based on T and S, and establishing a comprehensive hardness prediction model H2; outputting a hardness prediction result of the whole gear and the key area, and identifying a potential weak area; according to the method, thermal response and stress modulation parameters are fused, non-destructive and high-resolution hardness distribution prediction is achieved, and the method is suitable for quality evaluation and failure early warning of the powder metallurgy gear of a complex structure.

The invention belongs to the technical field of powder metallurgy, and particularly relates to a high-strength tungsten alloy wire and a preparation method thereof, lanthanum oxide is uniformly doped through a ball-milling mixing and microwave sintering method, the recrystallization temperature of tungsten crystal grains is reduced by coordinating logarithmic strain of a rotary hammer, an annealing process and the like, the tungsten crystal grains uniformly grow, and the high-strength tungsten alloy wire is prepared. The wire diameter of the high-strength tungsten alloy wire is smaller than 30 microns, the tensile strength of the high-strength tungsten alloy wire is larger than or equal to 6200 MPa, and the percent of pass of the high-strength tungsten alloy wire is larger than or equal to 80%.

The invention discloses a part visual inspection method and system for powder metallurgy machining, and belongs to the field of powder metallurgy manufacturing. The method comprises the steps that a gray image of the surface of a part is acquired; obtaining a window scale coefficient of each pixel point according to the gray level change of other pixel points in the neighborhood range of each pixel point in the gray level image; obtaining a global gray center point according to the gray distribution of the gray image; obtaining a central point offset coefficient of the pixel point according to the window scale coefficient, the gray scale difference and the global gray scale central point of the pixel point; according to the center point offset coefficient of the pixel point, obtaining the center importance degree of the pixel point to the grayscale image, including obtaining the overall importance degree and the local correction coefficient; the pixel points are divided into interested areas or non-interested areas according to the center point offset coefficient, scale transformation is carried out in combination with the center importance degree, visual detection is completed, and the detection adaptability to defects of different scales and forms is improved through self-adaptive window analysis and an overall-local double correction mechanism.

The invention belongs to the technical field of powder metallurgy, and relates to a preparation method and application of a high-performance isotropic GH4698 drum piece, prepared GH4698 high-temperature alloy powder with the particle size of 53-250 microns is loaded into a prefabricated sheath under the condition that the vacuum degree is smaller than or equal to 1 * 10 <-3 > Pa, after treatment is conducted 2-3 times through a multi-cycle hot isostatic pressing process system, furnace cooling is conducted, and the high-performance isotropic GH4698 drum piece is obtained. And machining is adopted to remove the sheath to obtain a GH4698 drum piece blank in a powder metallurgy state, and a solid solution and aging heat treatment process is adopted for the drum piece blank, so that the high-performance isotropic GH4698 drum piece can be obtained. According to the preparation method, the yield of the GH4698 drum part can be effectively increased, the GH4698 drum part with high performance and isotropic performance can be obtained by effectively improving the grain size and distribution of the part, the carbide distribution and the internal stress state of the part, the utilization rate of an alloy material is promoted to be increased, the stability of the production process is improved, and in addition, the yield of the GH4698 drum part is improved. All mechanical properties of the prepared GH4698 drum piece meet the performance requirements of a drum shaft for a novel aero-engine.

The invention relates to the technical field of powder metallurgy, in particular to a preparation process of a graphene composite profile prepared from brass waste, which comprises the following steps: selecting the brass waste containing different components according to the application scene of the graphene composite profile; the brass waste materials are smashed into brass block-shaped smashed materials; the preparation method comprises the following steps: adding 0.001-10% by mass of graphene into the brass block-shaped crushed aggregates, and carrying out wet ball milling to form a first-size mixed powder liquid; carrying out semi-solid rotary shearing and stirring processing on the mixture; and continuously extruding the graphene-brass mixed base material to form a graphene composite profile blank, and carrying out post-process to obtain the graphene composite profile capable of overcoming brass spot, line and surface defects. According to the invention, a powder metallurgy process is combined with a medium-temperature continuous extrusion process, so that the brass waste is efficiently and directly recycled without pollution, and the physical properties and chemical properties such as hardness, strength, conductivity, corrosion resistance and high-temperature creep resistance of the composite material are greatly improved. The invention further correspondingly discloses the graphene composite profile and application.

The invention provides a filling process prediction method and device based on a discrete element method and data driving, and relates to the technical field of bulk material forming, and the method combines the physical modeling advantage of the discrete element method and the powerful prediction capability of a data driving method. The filling process of the granular material under different process parameters is simulated through a discrete element method, key quality indexes are obtained to serve as input of a data driving model, and the process parameters serve as output for training. The model not only can accurately predict the filling quality, but also can adjust the process parameters in real time according to the target quality index, so that the intelligent optimization of the filling process is realized. According to the method, the calculation efficiency is greatly improved, the generalization ability of the model is enhanced, the dependence on empirical data is reduced, a more efficient and accurate solution is provided for the filling process in the industries of building materials, pharmacy, powder metallurgy and the like, the product quality is improved, the production cost is reduced, and the research, development and application of novel materials and equipment are accelerated.

The invention is suitable for the technical field of advanced powder metallurgy and ceramic material sintering, and provides an assembly line type flash sintering system and a sintering method. The system comprises a powder loading and pre-pressing module, a first automatic graphite paper pressing, paving and replacing module, a sintering module, a demolding and sampling module and a second automatic graphite paper pressing, paving and replacing module which are sequentially arranged in the material flowing direction, all the modules are connected through the vacuum switching module to form a continuous vacuum environment; the system further comprises a conveying system which is used for driving the sintering units bearing materials to sequentially flow among the modules. The continuous flash sintering device is suitable for carrying out efficient and full-automatic continuous flash sintering treatment on powder materials in a vacuum or protective atmosphere environment, the platform overturning risk can be fundamentally avoided, and the stability and safety of the sintering process are ensured.

The invention belongs to the technical field of powder metallurgy, and particularly relates to a titanium-based composite workpiece and a preparation method and application thereof. High-entropy alloy powder with fine granularity is preferably selected as reinforcing phase powder after being prepared by adopting a gas atomization method and subjected to vibration screening, the particle size of the reinforcing phase powder and internal crystal grains of particles are fine, and after the reinforcing phase powder and titanium alloy powder are uniformly mixed, hot isostatic pressing low-temperature sintering treatment is performed, so that the high-entropy titanium alloy is obtained. Fine grain structures in reinforced phase powder particles are reserved in the titanium-based composite master alloy bar, and then a secondary plasma rotating electrode method is used for preparing powder, so that the titanium-based composite powder with uniform components and smaller grain structures is obtained; after mixing, the homogenized titanium-based composite mother alloy bar is prepared into powder through a secondary plasma rotating electrode method, chemical components are further dispersed and homogenized, reinforcing phases are distributed in all titanium-based composite powder particles, and the reinforcing effect can be further improved through an unconventional surface contact type reinforcing mode.

The invention belongs to the technical field of powder metallurgy production, and discloses a silver tungsten carbide graphite waste recovery treatment device and method.The silver tungsten carbide graphite waste recovery treatment device comprises a treatment box, a conveying module is arranged on the outer wall of the treatment box, a discharging port is formed in the outer wall of the treatment box, and smashing rollers are arranged on the inner wall of the treatment box; a downward pressing mechanism is arranged on the inner wall of the treatment box, a shielding mechanism is arranged on the outer wall of the treatment box, and a screening mechanism is arranged on the outer wall of the treatment box; the screening mechanism comprises a motor, an output shaft of the motor is fixedly connected with a chain wheel A, and the outer wall of the chain wheel A is in transmission connection with a chain wheel B through a chain; through cooperation of the motor and the trapezoidal block, waste materials crushed by the crushing roller can fall on the screen, and the waste materials can be stacked more uniformly through continuous movement of the moving frame and the screen, so that the problem that the screening efficiency is affected due to the fact that the waste materials fall on the screen and then are stacked at one position is avoided.

The invention belongs to the technical field of metal material forming, and relates to a high-strength plastic titanium-based composite material annular part and a preparation method and application thereof. The preparation method comprises the following steps: firstly, uniformly mixing titanium alloy powder and reinforced phase powder, then preparing an annular blank according to the technological process of smelting, plasma rotating electrode atomization, degassing seal welding, hot isostatic pressing and ring rolling, and finally, annealing the annular blank to prepare the target annular part. According to the method, the titanium-based composite material powder is prepared by replacing a traditional laboratory small-batch ball milling method with a large-batch mixing method, a vacuum induction melting rod manufacturing method and a plasma rotating electrode atomization method, a reinforced phase can be introduced into a titanium matrix crystal and uniformly distributed, and the method is suitable for industrial large-batch production requirements; the titanium-based composite material annular part is prepared through the technology of powder metallurgy blank making and thermal deformation, and the effects of shortening the machining period and improving the material utilization rate and the forming rate are achieved through the precise size of powder metallurgy forming and the high efficiency of special-shaped ring rolling.

The invention discloses a multi-component composite oxide dispersion strengthening molybdenum alloy and a preparation method thereof, and relates to the technical field of refractory metal powder metallurgy preparation. The molybdenum alloy comprises a molybdenum matrix and a Y-X-O composite oxide nano precipitated phase dispersed and distributed in the molybdenum matrix. The molybdenum alloy comprises the following components in percentage by mass: 1%-2% of Y2O3, 0.3%-1.2% of an active element X, 96.5%-98.7% of molybdenum and inevitable impurities, wherein X is selected from one of Ti, Zr and Hf; the Y-X-O composite oxide nano precipitated phase and the molybdenum matrix form a coherent or semi-coherent interface, and the interface mismatch degree is less than or equal to 5%. The molybdenum alloy has excellent high-temperature strength and creep resistance, and can be applied to the high-temperature fields of nuclear industry, aerospace and the like.

The invention relates to a method for preparing bimetallic core-shell structure composite powder based on an acoustic resonance technology, and belongs to the technical field of powder metallurgy. Adding the micron matrix metal powder and the nano coating layer metal powder into a mixing tank, replacing air in the mixing tank with protective gas or active gas, and setting the pressure of the gas in the tank and the temperature of the tank body; and then three-section acoustic resonance coating powder preparation is carried out, and the bimetal core-shell structure composite powder is obtained. According to the method, different metal powder is driven by acoustic resonance to do violent disordered movement, the outer layer of micron metal powder is evenly and tightly coated with nano metal powder under the combined action of electrostatic force and other physical force, and finally the core-shell structure bimetal coated powder is obtained. The method is simple, the preparation efficiency is high, the applicability is wide, the thickness adjustable range of the coating layer of the obtained bimetallic coated powder is wide, the obtained bimetallic coated powder is uniform and compact, the powder particle morphology can be effectively maintained, and pollution of other elements is avoided.

The invention discloses a TC4 titanium alloy preformed blank, a TC4 titanium alloy plate with a full lamellar structure and a preparation method of the TC4 titanium alloy plate, and belongs to the technical field of titanium alloy machining. According to the method, TC4 alloy powder prepared through hydrogenation dehydrogenation and plasma rotating electrode atomization serves as a raw material, and a high-density binary structure preformed blank is prepared through a three-step type hot isostatic pressing technology; a pure titanium sheath is adopted for packaging, two-heating-number rolling is conducted through the sheath, and the plate shape is optimized through convexity design of a working roller and dynamic roller bending force control; and after rolling, solid solution and two-stage aging composite heat treatment are combined, the head and the tail are cut off, and the TC4 titanium alloy plate is obtained. The problem of tissue segregation of a traditional cast ingot is solved through powder metallurgy, the obdurability is improved, and the anisotropy is reduced; and meanwhile, the raw material cost is reduced, the production period is shortened, the yield is increased, the surface quality is improved, and a reliable scheme is provided for green and efficient preparation of high-performance titanium alloy plates in the aerospace field.

The invention belongs to the technical field of powder metallurgy, and particularly relates to a powder metallurgy mold three-dimensional dynamic filling intelligent monitoring system which comprises a distributed multi-mode sensing unit, a high-performance data acquisition and preprocessing unit, a three-dimensional powder distribution reconstruction and digital twinning module, an intelligent defect recognition and evaluation module and a process feedback and control interface. And the limitation that in the prior art, the powder filling process in the mold cavity lacks real-time, local and three-dimensional monitoring capacity can be overcome. According to the system provided by the invention, fine sensing and intelligent diagnosis of the powder distribution state are realized, so that the forming quality of a powder metallurgy component is effectively improved, the rejection rate is reduced, and a solid foundation is laid for realizing intelligentization and self-adaptive control in the powder metallurgy production process.

The invention relates to the technical field of stainless steel pneumatic cylinder barrels, and particularly discloses a wear-resistant stainless steel pipe for a pneumatic cylinder barrel and a preparation process thereof.The wear-resistant stainless steel pipe for the pneumatic cylinder barrel comprises the steps that firstly, a powder metallurgy method is adopted, tungsten carbide, cerium oxide, chromium nitride and other components are added into stainless steel powder, and the performance of a steel pipe base body is enhanced; the corrosion-resistant alloy layer is deposited on the surface of the steel pipe, so that the corrosion resistance, wear resistance and other properties of the steel pipe are enhanced, finally, a silicon nitride wear-resistant ceramic layer is sintered on the surface of the corrosion-resistant coating, and two lubricants of graphite and molybdenum sulfide are synthesized in gaps and holes of the wear-resistant ceramic layer. The defects on the ceramic surface are blocked; and the ceramic coating is endowed with a self-lubricating function.

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 the field of design and preparation of powder metallurgy friction materials, in particular to a copper-based powder metallurgy friction material and a preparation method thereof. Raw materials used in the method comprise, by mass, 45%-55% of copper powder, 8%-20% of iron powder, 6%-15% of ferrochromium, 16%-22% of graphite, 0.5%-4% of molybdenum disulfide, 0.5%-4% of tin sulfide and 0.5%-4% of nickel-coated tungsten disulfide, and the mass ratio of the tin sulfide to the nickel-coated tungsten disulfide is (1-2): (1-2). In the nickel-coated tungsten disulfide, the content of nickel is 5-40%; the sum of the total amount of molybdenum disulfide, nickel-coated tungsten disulfide and tin sulfide is less than or equal to 5%. The preparation method comprises the following steps: weighing raw material powder according to the designed components, mixing, pressing and sintering to obtain the product. The composition design has the characteristics of scientificity, simple and controllable process and the like, and the obtained product has excellent tribological performance and completely meets the friction braking requirement of high-speed heavy-load equipment of 400km / h and above.

The invention discloses a powder metallurgy part pressing forming device which comprises a circulating feeding mechanism, a pressing mechanism, a secondary processing mechanism and an intermittent discharging mechanism, the circulating feeding mechanism comprises a motor, and a lower pressing head assembly is arranged on one side of a filtering assembly. According to the powder metallurgy part pressing forming device, a motor drives a rotating shaft to drive a material box to rotate, in the rotating process of the material box, two sets of brush plates on the side face of the material box sweep and gather powder accidentally falling out in the moving process of the material box and powder falling in the pressing forming process in sequence, and when the material box and the brush plates rotate to the position above a filtering assembly, the filtering assembly can filter the powder. The powder gathered by the brush plate automatically falls through the filter assembly and is uniformly recycled, so that secondary use is realized, the powder is prevented from remaining on the workbench, the powder is prevented from being moved and mixed with new powder in the subsequent feeding process, and the production consistency and the processing quality of powder metallurgy parts are ensured.

The invention relates to the field of metal powder processing, in particular to a sintering process intelligent control method and system based on a powder metallurgy metal material, and the method comprises the steps: obtaining a temperature curve of a powder metallurgy sintering process, determining the offset of each curve through a cross-correlation function, and carrying out the alignment; the method comprises the following steps: determining a segmentation length according to segmentation adaptability of a local area, analyzing an abnormal reference degree based on correlation between a mahalanobis distance of each segment and sintering quality, obtaining an overall abnormal degree of each curve through normalization processing and weighted calculation, and judging whether an abnormal temperature curve exists according to the overall abnormal degree and a preset abnormal degree threshold value. And if the abnormal degree exceeds the preset abnormal degree threshold value, early warning that the sintering process is abnormal, and prompting adjustment control. According to the invention, local abnormity is accurately detected, temperature control is optimized, the production cost is reduced, and the product quality and the production efficiency are improved.

The invention relates to the technical field of metal casting and powder metallurgy, in particular to a pressure self-adaption adjusting method and system for multi-material forging and pressing, and the method comprises the steps that 1, forging and pressing equipment and a parameter collecting system are initialized; 2, multi-parameter data in the forging and pressing process are collected in real time; 3, calculating the dynamic deformation resistance of the material based on the real-time parameters; step 4, generating a self-adaptive pressure regulation value according to the dynamic deformation resistance; 5, controlling a pressure executing mechanism to output a target pressure value; and 6, the forging and pressing process is continuously monitored and terminated, the step 2 to the step 5 are repeated until the displacement of the die reaches a preset forging and pressing completion position, the central processing unit sends out a termination signal, the pressure execution mechanism gradually unloads pressure to complete the forging and pressing process, and all parameters and adjustment records are stored for quality analysis. Through accurate pressure control and a closed-loop feedback mechanism, defects caused by too high or too low pressure are avoided, the rejection rate is remarkably reduced, and the qualified rate of products is increased.

The invention discloses a powder metallurgy pressing die, and belongs to the technical field of powder metallurgy, the powder metallurgy pressing die comprises a base, a plurality of supporting rods are fixedly mounted at the upper end of the base, the bottoms of the supporting rods are in threaded connection with lock catch sleeves, and an upper die assembly is mounted among the tops of the supporting rods; a filling assembly is installed on the lower die assembly, the filling assembly can implement a filling function on the die, a recycling assembly is installed on the filling assembly, the recycling assembly can execute a recycling function on crushed aggregates left on the surface of the lower die assembly, and two fixing plates are fixedly connected to the rear end of the upper die assembly. Through the dual effects of brush cleaning and negative pressure adsorption, residual crushed materials on the surface of the lower die plate can be comprehensively collected, conveyed to the material return groove of the hopper through the material return pipe and re-fed to be circularly used for the follow-up filling procedure, the utilization rate of metal powder is greatly increased, the machine does not need to be stopped for cleaning the residual materials, production continuity is guaranteed, and efficiency is improved.

The invention is suitable for the technical field of powder metallurgy and advanced ceramic material sintering equipment, and provides an integrated flash sintering device for vacuum and a sintering method. The device comprises a power supply module, a high vacuum module, a first servo hydraulic machine, a second servo hydraulic machine, a third servo hydraulic machine, a mold rotation switching module, a vacuum feeding module, a green body pressing module, a demolding and mold cleaning module and a mold transfer module. According to the invention, an integrated gear tray design is adopted to integrate the functions of die installation, graphite paper treatment and green body pressing, and online synchronous cleaning of an electrode and a die is realized through die fixation and a cleaning brush arranged in a cleaning drum; therefore, full-automatic, high-efficiency and high-stability continuous production of flash sintering from powder filling to finished product collection is realized.

The invention belongs to the field of high-temperature alloy powder metallurgy, and particularly relates to a low-cost and high-performance GH4079 alloy workpiece and a powder metallurgy forming method thereof. The powder metallurgy forming method comprises the steps that GH4079 spherical powder is adopted for preparing a GH4079 alloy blank, solid solution and aging heat treatment is conducted on the GH4079 alloy blank, and a GH4079 alloy workpiece is obtained; solid solution and aging heat treatment is conducted on the GH4079 alloy blank, the whole heat treatment process is simple, the process is simple and convenient, consumed time is short, energy consumption is lower, the method is suitable for industrial application, the obtained GH4079 alloy workpiece is excellent in mechanical property, and under the room temperature condition, the tensile strength is larger than 1500 MPa, the yield strength is larger than 1020 MPa, the ductility is larger than 20%, and the percentage reduction of area is larger than 25%; and under the condition of 650 DEG C / 882 MPa, the endurance life is longer than 210 h.

The invention relates to a powder metallurgy high-performance copper-based alloy friction plate for a torque limiter of a wind power coupler and a preparation method of the friction plate. The friction plate is composed of, by mass, 9%-14% of carbon, 1%-3% of tin, 2%-8% of friction components, 12%-18% of iron, 0%-3% of nickel and the balance copper. The preparation method comprises the steps of burdening, mixing, forming, sintering and machining. The prepared high-performance copper-based alloy friction plate is particularly suitable for a torque limiter of a wind power generation coupler. The alloy disclosed by the invention is reasonable in component design, simple and controllable in preparation process, easy to realize batch, large-scale and automatic production, high in production efficiency, energy-saving and moderate in cost; the obtained product is excellent in performance, and can greatly improve the torque control precision, save the maintenance cost and improve the operation safety and reliability of wind power equipment when being applied to a wind power coupling torque limiter.

The invention belongs to the technical field of powder metallurgy, and particularly relates to a high-precision injection-molded titanium alloy workpiece and a machine learning assisted preparation method thereof.The machine learning assisted preparation method of the high-precision injection-molded titanium alloy workpiece comprises the steps that an original data set is obtained through three-dimensional mold filling numerical simulation, performing data processing on data in the original data set to obtain an expanded data set; based on the expanded data set, multiple different machine learning algorithms are adopted to construct an injection molding process parameter prediction model, and an optimal prediction model is obtained; and optimal process parameters are obtained based on the model, and a target titanium alloy workpiece is prepared. According to the method provided by the invention, three-dimensional mold filling numerical simulation and machine learning are fused, and the process parameter prediction model is constructed and optimized, so that the actual MIM process is guided, the titanium alloy workpiece with high dimensional precision can be obtained, the research and development period is greatly shortened, and the trial-manufacturing cost is reduced.

The invention relates to the technical field of powder metallurgy, and discloses an anti-sintering deformation type powder metallurgy device which comprises a powder metallurgy punching machine, a plate body is arranged on the powder metallurgy punching machine, a die groove is formed in the plate body, a punching head is arranged on the powder metallurgy punching machine, a movable base is arranged on the plate body, and a pressing plate is arranged on the movable base. A feeding pipe is fixed on the movable seat, and an electric powder butterfly valve is mounted on the feeding pipe; a rotating assembly is arranged in the moving seat and comprises a discharging pipe and an air suction pipe. Through the linkage design of the rotating assembly and the air exhaust assembly, active air exhaust is conducted on the die cavity before powder stamping, residual air is thoroughly exhausted, in the process, local stress concentration caused by high-pressure air mass formed by air compression in the pressing process is avoided, and the density of a pressed blank is more uniform and closer to a theoretical value; and compaction layering, cracks or surface defects caused by gas heating expansion are prevented.

The invention relates to the technical field of powder metallurgy materials, and discloses rare earth microalloyed ultrahigh-strength high-toughness hot work die steel and a preparation method thereof.The die steel is prepared from 4Cr5MoSiV1 pre-alloyed powder, rare earth hydride, boron carbide and porous amorphous carbon powder loaded with a nickel catalyst. The preparation method comprises the steps of material mixing, sheath packaging, graded dynamic reaction thermal devolatilization, hot isostatic pressing densification and heat treatment, in the graded dynamic reaction thermal devolatilization, active hydrogen generated by decomposition of rare earth hydride is used for reducing oxide on the surface of powder, and nickel catalyzed carbon powder is used for capturing water vapor at low temperature to generate CO to be discharged. An oxide film on the surface of the powder is thoroughly removed through in-situ chemical reaction, original particle boundaries are eliminated, meanwhile, a nano strengthening phase with high thermal stability is generated in situ, and the high-temperature strength, impact toughness and tissue compactness of the die steel are remarkably improved.

The invention relates to the technical field of diamond saw blades, in particular to a laser welding diamond saw blade for ultra-narrow slit cutting and a preparation method of the laser welding diamond saw blade. The copper-cobalt-tin alloy material comprises the following raw materials: copper-cobalt-tin alloy powder, tungsten carbide powder, titanium-aluminum nitride, spherical cobalt powder, rare earth yttrium powder, ferrophosphorus powder and diamond abrasive particles. According to the preparation method, the core of the preparation method lies in the combination of powder metallurgy prefabrication of the tool bit and the precise laser welding process, especially the innovative laser welding process, and the prepared diamond saw blade is high in welding seam strength, narrow in heat affected zone and extremely small in matrix deformation; the problems of base body deformation, insufficient welding seam strength, short service life and the like of a traditional saw blade in the ultra-narrow seam cutting process are solved, and the saw blade is perfectly suitable for ultra-narrow seam cutting scenes with extremely high requirements for precision and stability.

The invention discloses a detection device and method for detecting the breaking strength of each strut of a powder metallurgy part with multiple struts, and relates to the technical field of detection of the breaking strength of struts of parts. The arched frame is fixedly arranged on the surface of a workbench, the tool assembly is arranged on the bottom surface of a cross beam of the arched frame and used for installing powder metallurgy parts with multiple supporting rods, two pressure sensor installation assemblies are arranged on the surface of the workbench, and the two pressure sensor installation assemblies are located on the left side and the right side of the tool assembly respectively; the workbench is further provided with a driving and impacting assembly which is located between the two pressure sensor installation assemblies and used for driving the pressure sensors to horizontally move in the horizontal direction and the vertical direction and impacting the supporting columns. The device has the beneficial effects that the detection time of the four supporting rods of a single part is greatly shortened, and the detection efficiency of the breaking strength of the four supporting rods of the part is greatly improved.

The invention relates to a powder metallurgy defect detection method based on pattern recognition. The method comprises the following steps: collecting process environment parameter data of each key position on a powder metallurgy production line and defect images and signal data of a detection object in real time; performing denoising and normalization processing on the original data set; extracting spatial features of the defect image and the signal data, and process environment parameter dynamic sequence features of each production unit; constructing a process parameter distribution model based on an adaptive time sequence; inputting the joint vector and the parameter distribution description into a depth time sequence neural network model; calculating an occurrence probability trend of each defect type in a future preset time window; and judging whether the defect trend early warning signal meets a process safety limit or an industry quality threshold. According to the method, the process change of a production field can be sensed in real time, the model can still automatically compensate characteristic drift even under the condition of raw material batch replacement or equipment characteristic fluctuation, and the high precision of defect type trend early warning judgment is kept.