334 results about "Metal flow" patented technology

The invention relates to the technical field of ring piece rolling, and discloses a large special-shaped ring piece rolling forming process analysis method which comprises the following steps: (1) forge piece and blank design: designing different types of blanks; (2) material characteristic modeling: establishing a material model meeting rolling conditions; (3) finite element model establishment: establishing a geometric model of a rolling process by utilizing finite element analysis software; (4) rolling process scheme design: designing a plurality of rolling process schemes; (5) process simulation and defect prediction: analyzing strain, stress, temperature field and metal flow conditions in the simulated rolling process, and analyzing defect generation conditions; and (6) real-time monitoring and feedback control: monitoring changes of stress, strain and temperature in real time, and automatically adjusting process parameters. And through dynamic material characteristic modeling, a self-adaptive grid division technology and multi-physical field coupling analysis, the analysis accuracy of the rolling process is improved, so that defect prediction is more accurate, and the quality of finished products is improved.

The invention relates to a free forging method for preparing an AAA nondestructive inspection grade large-specification TC4 alloy bar, and belongs to the technical field of titanium alloy hot working. According to the method, as-cast grains are fully crushed and refined through high-temperature and large-deformation forging in the cogging stage; high-low-high heating forging at the lower phase transformation point and the upper phase transformation point is used for promoting the high-temperature dynamic recrystallization process so as to homogenize crystal grains; the corner deformation dead zone is fully reduced through multi-heating-number diagonal drawing-out forging, and a U-shaped anvil is adopted in the forming stage to reduce metal flowing in all directions in the rolling stage. According to the free forging method for the large-specification TC4 alloy bar, the structure uniformity of the TC4 alloy bar can be improved, and the AAA-level nondestructive testing requirement is met.

The invention belongs to the field of metal material processing, discloses an extrusion forming method for a titanium alloy seamless tube and a product thereof, adopts a process route of primary reaming and secondary reaming to produce the titanium alloy seamless tube, and solves the problem of expansion cracking caused by adopting a primary large reaming ratio or material waste caused by drilling a large-diameter inner hole in the prior art. Production of products with the total reaming ratio larger than 1.30 is achieved; the steel sleeve is firstly wrapped on the pipe blank, and then the copper sleeve is wrapped on the pipe blank, so that copper pollution of the copper sleeve on the titanium alloy blank can be effectively avoided, and the surface quality of a product is improved; the double-cone die is adopted for extrusion, the metal flowing stability can be improved, the extrusion force is reduced, the extrusion defects are reduced, deformation is stable and uniform, cracks of the pipe can be avoided, and the surface quality of the pipe is improved; and meanwhile, the double-cone die can reduce friction between the titanium alloy and the die, and the copper sheath is protected. The method is suitable for metal material processing industry.

The invention discloses a thin-wall multi-fin part integrated forming device and process, the thin-wall multi-fin part integrated forming device comprises a die holder, a lower die is arranged at the top of the die holder, a shape control die is embedded in the top end of the lower die, and an upper die is arranged at the top ends of the lower die and the shape control die; the power output end of the upper pressing mechanism is fixedly connected with a shape filling mold which is movably inserted into the lower mold, and the power output end of the secondary upper pressing mechanism is fixedly connected with an ejector rod which is movably inserted into the shape filling mold; the power output end of the downward pressing mechanism is fixedly connected with a male die movably inserted into the upper die, and the power output end of the secondary downward pressing mechanism is fixedly connected with a hole forming rod movably inserted into the male die. The integrated forming process of the whole forming process of local heating, upsetting, necking and back upsetting of a blank and overall forming, hole forming, cooling and demolding of a formed part can be achieved, the complete metal flow line of the thin-wall multi-fin part is kept, and local strengthening and efficient near-net forming of a fin area are achieved.

The invention discloses an aluminum alloy extrusion forming production process, which relates to the technical field of extrusion production, and comprises the following steps: designing an extrusion die, carrying out surface heat treatment on the extrusion die, selecting an aluminum alloy material, heating and extruding, carrying out surface treatment processing on a produced aluminum alloy profile, and packaging the aluminum alloy profile after the aluminum alloy profile is inspected to be qualified. Compared with the prior art, the method has the advantages that the grain structure of the profile can be more uniform and refined by accurately regulating and controlling the complex relation among parameters such as the extrusion temperature, the mold temperature, the extrusion speed and the lubricating condition, so that the mechanical property is enhanced, like a 6063 aluminum alloy profile, the tensile strength can be improved, the yield strength is improved, deformation or damage in the using process is effectively avoided, and meanwhile, the service life of the profile is prolonged. Good parameter matching can effectively reduce internal defects of the profile, metal can flow in a mold more smoothly, internal pores, cracks and other defects caused by non-uniform metal flow are reduced, and the surface quality is greatly improved.

The invention provides a wire harness crimping quality intelligent detection and self-adaptive control method and system, and the method comprises the steps: calculating a stress distribution value of a crimping point through the obtained internal metal flow distribution characteristics in combination with a mechanical strength simulation algorithm, and obtaining a mechanical strength evaluation index; if the mechanical strength evaluation index is lower than a preset threshold value, triggering an alarm signal, extracting deviation type data from the alarm signal, and judging a quality judgment result; generating a feedback control instruction according to the judged quality judgment result, transmitting the feedback control instruction to crimping equipment to adjust crimping force parameters, and obtaining optimized crimping process data; updating a real-time monitoring database by adopting the obtained optimized crimping process data, and determining a geometric parameter reference value of a subsequent crimping batch; and matching the determined geometric parameter reference value with a vehicle safety requirement to obtain a final quality verification report.

An aluminum wheel low-pressure casting mold filling process control device belongs to the technical field of automobile hub low-pressure casting and is provided with a bottom mold, a top mold and a side mold, the top mold and the bottom mold are used in cooperation to form the upper contour of a casting, and a plurality of temperature monitoring points, pressure monitoring points and a cooling system are arranged in the upper contour. The side die is used in cooperation with the bottom die and the top die, a plurality of temperature monitoring points, pressure monitoring points and a cooling system are arranged on the side wall of the side die, and the temperature monitoring points, the pressure monitoring points and the cooling system are all electrically connected with a control system of the aluminum wheel low-pressure casting mold filling process control device. The temperature monitoring points and the pressure monitoring points are arranged, temperature distribution, pressure changes and metal flowing behaviors in the mold filling process are monitored in real time in combination with the data acquisition and analysis system, the mold active exhaust technology is further combined, the mold filling stability and consistency are ensured, and therefore the casting quality is remarkably improved, and the defect rate is reduced.

The invention provides a defect prediction and quality control method for high-strength aluminum alloy welding based on numerical simulation. The defect prediction and quality control method comprises the steps that a welding process finite element model is established according to the actual situation; inputting accurate heat source parameters, simulating a molten pool flow field, and revealing an influence rule of metal flow in the micro molten pool on formation of micro defects through visual simulation; phase field simulation and stress distribution simulation are conducted on the solidification behavior of the molten pool, the grain structure condition of a weld zone is obtained, and crack tendencies under different processes are evaluated in combination with stress distribution; post-welding deformation of the whole component is simulated, stress deformation of a key part is obtained, and post-welding deformation is inhibited by means of reversible deformation, pre-pressing and the like. The method belongs to the field of welding numerical simulation, and can help to adjust the welding process, reduce the crack occurrence rate during welding of the high-strength aluminum alloy and inhibit post-welding deformation.

The invention discloses a steel structure butt welding adjusting device and method, and belongs to the technical field of steel structure butt welding. A steel structure butt welding adjusting device comprises a first inserting pipe and a second inserting pipe corresponding to the first inserting pipe, fixing rings are fixedly installed on the surfaces of the corresponding ends of the first inserting pipe and the second inserting pipe, rotating grooves are formed in the outer surfaces of the two fixing rings, and rotating blocks matched with the rotating grooves are slidably connected into the rotating grooves. Compared with a traditional welding device, in the clamping and fixing process of two steel pipes, the clamping plates synchronously move to clamp and fix the steel pipes to the center line positions of the first insertion pipe and the second insertion pipe, alignment of the steel pipes before welding is guaranteed, the welding head rotates to surround the to-be-welded positions of the steel pipes for one-time welding, and the welding efficiency is improved. The centrifugal force generated by rotation of the steel pipe is prevented from affecting metal flowing of a welding pool, the steel pipe welding speed of the welding device is increased, and the steel pipe welding quality of the welding device is improved.

The steel wire rod for the low-carbon welding wire comprises the following chemical components in percentage by weight: 0.06 to 0.08 percent of C, 0.81 to 0.87 percent of Si, 1.41 to 1.47 percent of Mn, less than or equal to 0.023 percent of P, 0.008 to 0.015 percent of S, less than or equal to 0.010 percent of Al, more than or equal to 1.67 percent of Mn / Si and the balance of Fe and inevitable impurities. The invention further provides a production method of the steel wire rod for the low-carbon welding wire, and the steel wire rod for the low-carbon welding wire is prepared through a molten steel smelting procedure, a refining procedure, a casting procedure, a heating procedure, a temperature control rolling procedure and a slow cooling procedure which are sequentially carried out. The tensile strength of the wire rod is smaller than or equal to 550 Mpa, the percentage elongation after fracture is larger than or equal to 35%, the drawing performance is good, and the gas shielded welding wire with the diameter ranging from 0.8 mm to 1.2 mm can be produced; welding wire seam metal provided by the product is good in mobility, a welding pool is fast to solidify, and welding seam formability is good. In addition, the unique slow cooling process enables metallographic phase transformation to be sufficient, the use aging period of the product is shortened by half, and therefore the production cost of a manufacturer is reduced.

The present invention discloses a fuel cell visualization test device, which belongs to the field of fuel cell technology. The present invention includes a transparent end plate with a boss structure and a metal flow field plate with a hollow flow channel structure. The boss structure of the transparent end plate and the hollow flow channel structure of the metal flow field plate are combined to form a visualized fuel cell end plate and flow field structure; the surface of the transparent end plate is processed with a boss structure, and the introduction of the boss structure can effectively block the mutual flow of water between different flow channels, and can truly and accurately reflect the water distribution of the fuel cell. The present invention has the advantages of simple processing and manufacturing, low cost, high test accuracy, and high safety. It can display the water distribution and flow conditions of the fuel cell flow channel and MEA surface in real time online, and it can be extended to fuel cells with various flow field shapes and various active areas, and has good versatility.

The utility model discloses an extrusion die for an asymmetric-section 2195 aluminum-lithium alloy section for aerospace. The extrusion die is provided with a pre-deformation cavity, a flow guide cavity and a working belt, wherein the pre-deformation cavity is used for preliminarily deforming a blank towards the section of the section; the flow guide cavity is used for adjusting metal flow in different areas; the pre-deformation cavity and the flow guide cavity are arranged in a stepped mode in the direction of the working belt, the cavity walls of the flow guide cavity are provided with different offsets and flow guide inclination angles according to the section characteristics of the sectional materials and the flowing characteristics of metal, the purpose of directly extruding the straight sectional materials can be achieved through the working belt arranged in a two-stage mode, the product has good perpendicularity, the appropriate section size is obtained, and the production efficiency is improved. And the twisting defect is reduced.

This invention provides a thickness control method for a single-stand reversible cold rolling mill. The single-stand reversible cold rolling mill unit includes an inlet coiler, an outlet coiler, a mill body, a mill hydraulic system, an inlet thickness gauge, an outlet thickness gauge, an inlet speed gauge, an outlet speed gauge, an inlet tension gauge, and an outlet tension gauge. The single-stand reversible cold rolling mill unit also includes an S-roll, with S-rolls at both the inlet and outlet of the unit. The S-roll can rotate 180°, with the upper roll of the S-roll able to rotate to the lower roll position and the lower roll of the S-roll able to rotate to the upper roll position. The 180° rotation causes the strip steel to wind in an S-shape on the S-roll. The thickness difference of the strip steel is eliminated by adjusting the speed of the inlet S-roll to control the metal flow rate entering the roll gap.

The invention provides a method for improving fluidity of weld metal in friction stir welding of dissimilar aluminum alloy, and belongs to the technical field of friction stir welding of dissimilar metal. The method comprises the following steps that 7075 and 6061 aluminum alloy plates are in butt joint and fixed, and friction stir welding is conducted; and the ratio of the length of a stirring needle for friction stir welding to the thickness of the aluminum alloy plate is 0.675-0.725. The metal fluidity and hardness distribution uniformity of a welding joint of dissimilar aluminum alloy friction stir butt welding are influenced by regulating and controlling the needle length of the stirring needle. And when the ratio of the length of the stirring needle to the thickness of the plate is 0.7, the elliptical onion ring formed in the nugget zone of the welding joint is complete in structure, the number of circles is large, and the whole position is moderate, so that the weld metal fluidity of the welding joint is better, and the hardness distribution is more uniform.

The invention discloses an Inconel 718 superalloy high-strength seamless tube and a production method, the Inconel 718 superalloy high-strength seamless tube is produced through a route of combining processes of upsetting, blind hole reaming, twice continuous reaming, double-cone die hot extrusion, cold rolling, finished product solid solution aging treatment and the like, and the problem of material waste caused by solid ingot drilling and then expanding extrusion in a traditional process is solved. The material utilization rate is improved; the Inconel 718 superalloy high-strength seamless tube produced by the method is uniform and compact in crystal grain, and has relatively high obdurability and corrosion resistance; a double-cone die is adopted during extrusion, compared with a flat die, the metal flow resistance is reduced, the extrusion force is reduced, deformation is stable and uniform, and the problems of layering and cracking of the pipe are reduced; the method is suitable for metal material processing industry.

The invention provides a rolling forming method for a complete shape follow-up streamline raceway of a tapered roller bearing, and belongs to the field of bearing preparation. According to the size of an outer ferrule of the tapered roller bearing, a blank is designed, the size of a blanked bar and the size of the blank are determined, blanking is conducted to obtain a material section, and the height-diameter ratio of the bar is controlled to be small in the blanking process; the bar is subjected to upsetting according to the upsetting ratio to obtain an intermediate material, the upsetting ratio is controlled to be small in the upsetting process of the bar, the intermediate material is subjected to extrusion forming and stamping to obtain a blank, and the blank is punched to form a ring blank; and the ring blank is rolled through the fully-closed hole pattern to achieve rolling path streamline follow-up forming to obtain a final forge piece, and the rolling ratio is controlled to be large under the condition that a core roller can be placed in the fully-closed hole pattern. The influence of the blanking process on subsequent blank making is considered, and the bar size and the blanking diameter are designed, so that the height-diameter ratio of the bar is as small as possible, and the radial flow of bearing ring metal at the stage is reduced; and in consideration of the influence of the upsetting process on subsequent rolling metal flow, a reasonable upsetting ratio is designed, so that the upsetting ratio is as small as possible, and the adverse influence of non-uniform deformation in the forging process on metal streamline distribution is reduced.

The invention discloses a friction stir welding stirring head capable of improving the flowing efficiency of base metal, which is characterized by comprising a friction stir welding stirring head body, the friction stir welding stirring head body comprises a clamping part, one end of the clamping part is provided with a spiral stirring needle, and the other end of the clamping part is provided with a stirring rod; the spiral stirring needle spirally shrinks towards the end part of the stirring needle, and a shaft shoulder part is arranged outside the radial peripheral surface of the spiral stirring needle; the shaft shoulder part is a concave surface inner asymptote groove shaft shoulder part; the spiral stirring needle is of a conical thread equally-divided three-section-shaped structure. And the end part of the spiral stirring needle is provided with a convex end head structure. According to the design of the end part of the stirring needle, the overall flowability of workpiece base metal can be effectively improved, a smaller crystal grain structure is generated, the forming is more stable, and the quality of a welding seam is enhanced.

The invention discloses steel for a bearing outer ring of a super-power wind generating set and a manufacturing process of the steel, and belongs to the technical field of wind power equipment manufacturing. The invention discloses steel for a bearing outer ring of a super-power wind generating set. The steel comprises the following components in percentage by mass: 0.48%-0.52% of C, 0.28%-0.33% of Si, 0.62%-0.66% of Mn, 0.97%-1.04% of Cr, 0.16%-0.21% of Mo, 0.005%-0.01% of Ti, 0.003%-0.008% of Zr, 0.0007%-0.001% of Ba and the balance of Fe. According to the method, alloy elements such as Ti, Zr and Ba are used for refining the sizes of grains and inclusions, meanwhile, the crushing degree and uniform distribution of the blank tissue and the inclusions are enhanced through extrusion and torsion, a fine and uniform metal flow line can be obtained after ring rolling, and the mechanical property of a forged piece is improved.

The invention provides a precision forging method for an adjustable blade of an aero-engine based on titanium alloy, which can realize precision forging forming of the blade of the titanium alloy aero-engine, enables the blade profile size of a blade forging to directly reach the size of a finished product, does not need to be machined again, is high in product percent of pass and good in air passage consistency, also can keep the continuity of a metal flow line, and is suitable for large-scale production. The mechanical property and the aerodynamic performance are high, and the surface integrity and the metallographic structure meet the design requirements. The method comprises the following steps of blanking, surface cleaning, glass lubricant spraying, heating blank making, surface cleaning, glass lubricant spraying and forging, and is characterized in that the forging procedure comprises heating upsetting, heating pre-forging and heating finish forging, and the surface cleaning and glass lubricant spraying are respectively carried out after each procedure of heating upsetting, heating pre-forging and heating finish forging.

The invention discloses intelligent forging equipment and method based on seamless steel pipe machining, and relates to the technical field of needing modification. The intelligent forging equipment comprises a titanium alloy cylindrical blank roller and a temperature control mechanism used for heating the titanium alloy cylindrical blank roller; a supporting and straightening mechanism used for conducting shaping and straightening on the titanium alloy cylindrical blank roller is arranged on one side of the interior of the temperature control mechanism, and a supporting frame is arranged on one side of the temperature control mechanism. Metal can be forced to flow through the hammering acting force of the forging hammer mechanism, small gaps and holes in the metal can be filled, air holes and shrinkage porosity in materials are reduced, the overall density of the materials is improved, potential stress concentration points are reduced, and therefore the reliability of the materials is enhanced; the titanium alloy is subjected to repeated plastic deformation, so that original coarse grains are crushed into finer grains, and grain refinement is beneficial to improving the strength and toughness of the material.

The invention provides a 60NiTi alloy high-purity preparation and rolling forming method. The 60NiTi alloy high-purity preparation and rolling forming method comprises the steps that firstly, raw material treatment is conducted, wherein the surface of a raw material is cleaned; step 2, vacuum induction suspension smelting; step 3, annealing treatment; step 4, pretreatment before rolling; fifthly, rolling forming is carried out; and sixthly, the sheath is removed, specifically, the sheath is cut off through an angle grinder, and the internal 60NiTi alloy plate is obtained. According to the method, a low-C-content high-quality cast ingot is prepared through a vacuum suspension smelting process of vacuum-pulsed magnetic field composite degassing, and a rolling forming process is adjusted according to the millisecond-level rapid precipitation characteristic of a Ni4Ti3 phase in the alloy and the metal flowing behavior in the plastic forming process; the problems that in the alloy rapid forming process, hard phase rapid precipitation and recrystallization are difficult are solved, the defects of non-uniform crystal grains, transverse cracks, longitudinal cracks and crocodile opening type cracks in the rolling process are avoided, and the 60NiTi alloy rolled plate uniform in microstructure and excellent in comprehensive performance is obtained.

A die for stamping sheet metal comprises a first portion with a convex bead, a second portion with a concave channel, at least one accelerometer positioned near the concave channel. When a sheet metal is positioned between the first portion and the second portion, the first portion and the second portion are configured to be brought together so that the convex bead mates with the concave channel to apply a blank holding force (BHF) to the sheet metal to clamp the sheet metal. The at least one accelerometer measures a time domain parameter or profile or a frequency domain parameter or profile during the placement of the sheet metal.

The utility model discloses a light integrated PVT photovoltaic assembly, which relates to the technical field of photovoltaic assemblies and specifically comprises a frame, the inner arc surface of the frame is of a hollow penetrating structure, a back plate is fixedly installed on the inner side wall of the frame, a condensation assembly is fixedly installed on the surface of one side of the back plate, and the condensation assembly is fixedly installed on the surface of the other side of the frame. The condensation assembly comprises a metal flow channel fixedly installed on the surface of one side of the back plate, bearing parts are arranged on the two sides of the bottom of the metal flow channel, the water pipe connector is divided into a water inlet and a water outlet, the water inlet and the water outlet are formed in the two sides of the bottom of the metal flow channel, and meanwhile S-shaped coil pipes penetrate through the positions between the water inlet and the water outlet. The internal cooling water circulates in the S-shaped coil pipe so as to take away waste heat generated on the back surface of the photovoltaic unit, the cooling effect on the photovoltaic unit is achieved, meanwhile, the cooling liquid which absorbs heat and is heated enters the interlayer of the heat absorption copper sheet, the heating effect on the interior of the heat absorption copper sheet can be achieved, photo-thermal collection is achieved, and the utilization rate of energy is improved.

The invention discloses a traveling wave magnetic field assisted flash welding method and equipment for rare earth alloyed wheel steel, and the method adopts a traveling wave magnetic field assisted flash welding process for the rare earth alloyed wheel steel meeting the automobile lightweight requirement, and enables a traveling wave magnetic field to continuously act on a welding area in the full stages of preheating, flashing and upsetting. Wherein the rare earth elements comprise cerium (Ce) and the like, and the components of the wheel steel are optimized through microalloying treatment; the temperature is accurately controlled to be 500-650 DEG C in the preheating stage, a traveling wave magnetic field of 10-30 mT and 50-100 Hz and specific welding parameters are adopted in the flash stage, the upsetting distance is controlled to be 2-5 mm and the upsetting pressure is controlled to be 6-8 MPa in the upsetting stage, heat transfer, metal flow and rare earth distribution are improved by means of the magnetic field, grains are refined, and defects are reduced. Meanwhile, the magnetic field and welding parameters are optimized through machine learning, and the purpose of minimizing the grain size is achieved. The method can remarkably improve the metallurgical bonding strength and the structure performance of the weld joint, and is suitable for efficient and high-quality welding of the rare earth alloying wheel steel.

The invention relates to the field of extrusion forming of piston skirts, in particular to an extrusion forming process of a large-size piston skirt of a marine diesel engine, which comprises the following steps of: placing a piston skirt raw material in a pre-forging annular die and a pre-forging lower die, pressing and moving downwards through a pre-forging convex die, forming a piston skirt pre-forging piece, taking out the pre-forging convex die, and replacing the pre-forging convex die with a finish-forging convex die; according to the method, the extrusion deformation process of the piston skirt is optimized, the internal metal deformation is smoother, the structure is more uniform, the metal flowing state of an area A with the most concentrated stress in the using process of the piston skirt is particularly improved, and the piston skirt forging is formed through downward pressing and movement of the finish-forging male die. And the overall quality is improved.

An improved direct smelting vessel includes a smelting reduction vessel (SRV) and optionally a cyclone converter (CCF). The SRV provides means for promoting metal mixing in an area beneath a slag layer adjacent a vessel wall of the direct smelting vessel. The device for promoting metal mixing may include a layered refractory hearth having two refractory base plate layers, a refractory hearth having one or more gas bubbling devices, and / or at least one pair of solids injection guns (or other devices) that provide alternating solids injection at any given time. The device for promoting metal mixing reduces the stagnation zone capable of supporting a semi-solid slag layer that limits metal-slag heat transfer. The means for promoting metal mixing maintain an effective temperature difference between the metal flowing out of the forehearth and the metal at the vessel wall not greater than 40 DEG C.

The invention belongs to the field of profile steel production, and particularly relates to a rolling method of hot-rolled Q450NQR1 weather-resistant H profile steel, which adopts a reversible cogging mill and a universal finishing mill group for rolling: after the cogging mill rolls for 3-5 passes for cogging, a universal continuous rolling mill is adopted for finish rolling 9 continuous rolling, and the arrangement sequence of finish rolling hole patterns is U1-U2-U3-E4-U5-U6-U7-E8-U9; wherein the U3 and the U6 are curved web hole patterns, and the vertical roll is in drum-shaped design. The method has the advantages that one BD cogging mill is used for large-rolling-reduction rolling to crush crystal grains, and then the nine-rack universal continuous rolling mill is used for finish rolling, so that the metal flowing and steel biting conditions are improved. The grain structure is refined through large rolling reduction and low-temperature rolling, the problems that the Q450NQR1 weathering resistant steel is poor in metal fluidity, prone to cracking and the like due to alloy elements are effectively solved, and meanwhile the mechanical property, the size precision and the surface quality of products are guaranteed.

The invention discloses an aircraft bearing inner raceway metal streamline symmetrical and uniform distribution automatic forging process method which comprises the steps that a, a two-station punch is adopted, specifically, a spure spreader punch punches and shunts, metal fibers in an inner hole are kept complete, and the defects of cutting, bending and the like are avoided; the inner wall of a second-station die cavity is designed to be in a big-end-up cone shape and is consistent with the punch in direction; c, chambering and via hole shaping: chambering by using a chambering punch until the outer diameter is parallel and has no taper, and shaping an inner hole by using a small-angle via hole punch according to the design size to realize that the inner hole is parallel to the outer diameter; and d, ring rolling is conducted, specifically, a straight inner hole is subjected to ring rolling, the ring blank is stably positioned on the mandrel, and uniform and symmetrical deformation is achieved on the two sides of an inner hole channel in the rolling and chambering forming process. The method has the advantages that the quality problems of non-uniform distribution of metal flow lines on the two sides of the channel and inconsistent density state are solved, and economic loss caused by waste products formed by non-uniform distribution of the metal flow lines of the channel in the bearing ring forge piece is avoided.

The invention discloses a wear-resistant hard-surface surfacing flux-cored wire and a preparation method thereof, and relates to the technical field of flux-cored wires. According to the flux-cored wire prepared through the method, hard boride is formed in a cladding metal crystal matrix, so that the cladding metal is endowed with very high hardness, boron carbide is further distributed in a surfacing layer, and the wear resistance is improved. Cladding metal formed by the flux-cored wire prepared through the method is good in fluidity, protective gas is not needed during welding, and therefore cost is saved. The flux core in the powder state is wrapped in the steel shell, the corrosion resistance of the welding wire is improved, the components are combined through two times of drawing and titanizing treatment, grains are refined, the hard face quality is improved, and the corrosion resistance effect and the wear resistance effect of the welding wire are improved.

The utility model relates to an alloy bar processing technology, and discloses a raw material structure for producing a high-temperature alloy bar, which comprises a high-temperature alloy blank, an integrated head sleeve, a first tail pad and a second tail pad, the high-temperature alloy blank is arranged in an inner cavity of the integrated head sleeve, the first tail pad is fixedly welded at the end part of the rear side of the integrated head sleeve, and the second tail pad is welded at the end part of the rear side of the integrated head sleeve. A second tail pad is movably arranged on the rear side of the first tail pad. A cylinder is arranged at the front end of the integrated head sleeve and connected with a conical surface, the rear side of the conical surface is connected with a cylindrical surface, the head shape of an inner cavity of the integrated head sleeve is a first circular plane, the rear side of the first circular plane is a first conical surface, and the rear side of the first conical surface is connected with a second conical surface. By optimizing the raw material structure, the extrusion force is reduced, the stress condition in the extrusion process is improved, the metal flow uniformity is promoted, extrusion cracks are avoided, the bar quality and the raw material utilization rate are improved, and the high-temperature alloy bar extrusion device is suitable for production of high-temperature alloy bars.