116 results about "Swaging" patented technology

The invention relates to a preparation method of a niobium rod with uniformly crushed crystal grains, which comprises the following steps: firstly, casting an alloy raw material to obtain a cast ingot, and preheating the cast ingot to obtain a first blank; then the first blank is subjected to multiple times of axial forging and first heat treatment, and a second blank is obtained; then carrying out surface treatment on the second blank to remove defects on the surface of the second blank, and carrying out radial forging on the second blank to obtain a third blank; then, the third blank is subjected to oxidation treatment so that an oxidation film can be generated on the surface of the third blank to protect the third blank, hole pattern rolling is conducted on the third blank with the oxidation film generated multiple times, and a first bar is obtained; secondly, the first bar is subjected to rotary swaging and polishing, and a second bar is obtained; and finally, the second bar is subjected to second heat treatment, and a finished bar is obtained. Through multiple times of axial forging, radial rotary forging and groove rolling rotary forging, the obtained finished bar is uniform and fine in grain structure, the grain size GS is 7-9 grade, the elongation is larger than or equal to 40%, and the hardness (HV / 2.9 N) is smaller than or equal to 60.

The invention discloses a hot forming preparation method of a high-temperature superconducting MgB2 wire rod based on resistance heating. The method comprises the following steps: 1, carrying out cold rotary swaging deformation after tubing to obtain a single-core complex; 2, after resistance heating, carrying out hot drawing deformation to obtain a single-core composite round wire; thirdly, the single-core composite round wires are bundled and assembled and then subjected to cold rotary swaging, and a multi-core bundled and assembled complex is obtained; 4, after resistance heating, carrying out hot drawing deformation to obtain a multi-core clustered composite MgB2 round wire; and 5, carrying out vacuum heat treatment to obtain the high-temperature superconducting MgB2 wire rod. Resistance heating is carried out before hot drawing deformation, so that the center Mg rod and the middle Nb barrier layer obtain excellent thermoplasticity, coordinated and uniform plastic deformation of the center Mg rod and the middle Nb barrier layer and the outer Cu sheath and uniform flowing of filled powder are achieved, and the MgB2 superconducting wire which is free of knots on the surface, free of core breakage in the interior and uniform in deformation is obtained and is suitable for the field of high-temperature superconducting. And meanwhile, the machining pass is reduced, the machining time is greatly shortened, and the preparation process is simplified.

The invention relates to the field of superconducting wire forming methods, in particular to a Nb3Sn superconducting wire preparation method based on multi-core wire liquid nitrogen cold drawing, and the Nb3Sn superconducting wire preparation method based on multi-core wire liquid nitrogen cold drawing comprises the following steps: preparing ultrahigh-tin-content copper-tin alloy powder by adopting a gas atomization method; the oxygen-free copper pipe, the oxygen-free copper rod and the pure niobium rod are machined, and the oxygen-free copper pipe and an oxygen-free copper bolt plug are obtained; acid pickling, cleaning and drying are carried out; uniformly fixing the pure niobium rods in the oxygen-free copper pipe to form a combined blank; performing rotary swaging to a required size, and then continuously drawing to obtain a finished wire; carrying out pulse treatment, and then carrying out air cooling to room temperature; and finally obtaining the Nb3Sn superconducting wire. According to the method, the strength and plasticity of the oxygen-free copper pipe sheath are improved through a liquid nitrogen cold drawing method, the combined blank is subjected to subzero treatment in the rotary swaging and drawing process, the plasticity of the combined blank is improved, and the high-strength and high-plasticity Ni3Sn superconducting wire can be obtained.

The invention discloses a titanium alloy wire drawing preparation method. The titanium alloy wire drawing preparation method comprises the following steps that a titanium alloy cast ingot is sequentially subjected to first heating number forging to obtain a first plate blank; the first plate blank is subjected to second heating number forging, and a second plate blank is obtained; the second plate blank is subjected to third heating number forging, and a third plate blank is obtained; performing fourth heating number forging on the third plate blank to obtain a fourth plate blank; the fourth plate blank is subjected to fifth heating number forging, and a bar is obtained; and carrying out rolling, rotary swaging and drawing on the bar to obtain the wire with the final size. According to the scheme, the titanium alloy bar is obtained through five-heating-number forging forming, the radial texture of the bar is high, the extensibility is improved, the bar has the better diameter reduction resisting capacity when bent in the special environment, and wire rod rolling and subsequent wire drawing process production are better facilitated. And the whole wire preparation process is free of acid pickling and electrolysis, no hydrogen, oxygen and nitrogen are increased in the production process, and the component purity is high.

The utility model belongs to the technical field of end cover taper pipe machining, and particularly relates to end cover taper pipe press-fitting equipment which comprises a taper pipe crimping machine body. The side wall of the taper pipe crimping machine body is fixedly connected with a guide rail; the inner side wall of the guide rail is slidably connected with a sliding block. The side wall of the sliding block is fixedly connected with a rubber pad. A taper pipe is arranged between the clamping plates on the two sides, the connecting block can move towards the opposite position along with rotation of the two-way screw rod, then the taper pipe can be clamped and fixed through the fact that the clamping plates on the two sides get close to each other, and the sliding block slides in the guide rail till the taper pipe clamped by the clamping plates enters the taper pipe crimping machine body. The taper pipe is clamped by the clamping plate to move into the taper pipe crimping machine body, so that the safety protection effect can be achieved when a worker uses the taper pipe crimping machine, the safety of the taper pipe crimping machine body in the taper pipe press fitting process is improved, and the situation that when the worker holds the taper pipe and stretches into the taper pipe crimping machine body, operation is improper, and certain injuries are likely to be caused to the worker is reduced.

Diagnostic chip devices, and methods and devices for assembly and manufacture, are described. Such chip device includes a chip carrier device that includes a frame having a fluidic interface, one or more fluidic channels and a gasket that forms a flowcell sealed against an active surface of a diagnostic chip. The gasket can be overmolded into the frame, or can be separately applied and compressed by the chip, which can be secured to the frame by cold swaging, hot swaging or heat staking, adhesive or any suitable means. The chip carrier device can further include a window over the flowcell to allow for optical detection of the active face of the chip. The window can be formed by a transparent lid or glass insert attached to the frame by laser welding, overmolding, adhesive or any suitable means. The carrier and lid can also be formed as a single integral component.

The invention discloses Ag-free high-temperature active alloy brazing filler metal and a preparation method and application thereof. The brazing filler metal alloy comprises 9.5-12.5 wt% of Ge, 9-11 wt% of Ti, 0.1-1.5 wt% of Ni and the balance Cu, the melting point of the brazing filler metal alloy ranges from 960 DEG C to 975 DEG C, and the recommended brazing temperature ranges from 1000 DEG C to 1100 DEG C. The product forms comprise foil strips, wires and powder paste. The preparation method comprises the steps of vacuum alloying, spherical gas atomization powder preparation, centrifugal ball milling powder mixing, spark plasma sintering, homogenizing heat treatment, isothermal rolling, isothermal rotary swaging and precise drawing. The alloy brazing filler metal is suitable for ceramic high-temperature direct packaging, diamond material device high-temperature brazing, refractory metal vacuum brazing and the like, high-strength weld joints can be obtained, the service temperature is high, the cost is low, and the problem that Ag element steam pollutes devices can be effectively solved.

The automatic production line for rubber pipe buckling and pressing comprises a conveying device, a cleaning device, a rubber stripping device, a buckling and pressing piece installing device, a buckling and pressing piece buckling and pressing device and a dustproof cap assembling device, the conveying device can convey rubber pipes to all the devices according to the process requirements, the cleaning device is used for cleaning the interiors of rubber pipe pipelines, and the dust cap assembling device is used for assembling dust caps. The rubber stripping device is used for stripping rubber on a rubber tube, the buckling and pressing piece mounting device is used for mounting a buckling and pressing piece on the rubber tube, the buckling and pressing piece buckling and pressing device is used for buckling and pressing the rubber tube and the buckling and pressing piece, and the dustproof cap assembling device is used for assembling a dustproof cap on the rubber tube; the automatic rubber pipe pressing machine is matched with the conveying device, the conveying device can automatically convey a rubber pipe to the next station to be machined, and therefore automatic cleaning, rubber stripping, buckling and pressing piece installation, buckling and pressing piece pressing and dust cap assembling of a rubber pipe pipeline are achieved, the manual operation amount is reduced, the labor cost is reduced, automatic flow production is achieved, and the working efficiency is greatly improved.

The invention discloses a rotary swaging die machining device and method, and belongs to the field of die machining. The mounting plate is fixedly connected to the upper end of the base; the workbench is fixedly connected to the upper end of the base; the mold is placed in the middle of the workbench; and a lifting rod is arranged at the top of the inner side of the mounting plate. In the descending process of the lifting rod, through cooperation of a plurality of components, the push plate can smoothly drive the moving rod, then the insulating rubber ball below the elastic film is compressed, vibration of the mold during machining is effectively relieved, reduction of the machining precision is avoided, the contact area of the elastic film and the mold is enlarged by compressing the rubber ball, and the machining precision is improved. The vibration of the mold is effectively relieved, the machining process is more stable, the machining precision and stability are improved, meanwhile, the friction degree between the edges of the two sides of the lower end of the mold and the elastic film can be reduced, and the service life of the elastic film is prolonged.

The present invention relates to a fabrication method for cobalt wire for a self-powered neutron-sensitive element. The cobalt wire fabrication method comprises the following steps: (1) cobalt powder reduction treatment; (2) mixing and compression molding; (3) vacuum induction melting; (4) forging, rotary swaging, and drawing; and (5) electrolytic polishing and annealing. Adopting the method described above allows for the fabrication of cobalt wire with a diameter of 1.00 mm-2.00 mm and having a purity greater than or equal to 99.95%, and the content of radiation-intolerant impurity elements (boron, cadmium, chromium, copper, and silicon) present in the cobalt wire is less than or equal to 30 ppm per element. The cobalt wire has an ovality precision of + / -0.003 mm, with a surface roughness less than or equal to Ra1.6 μm, a tensile strength greater than or equal to 900 MPa, and an elongation greater than or equal to 6%.

The application discloses a turbine disc die forging process reasoning method and system, and the method comprises the following steps: (1) selecting key points of a turbine disc which need to be controlled in organization; (2) extracting deformation information of the key points through finite element simulation of the whole forging process of the turbine disc; (3) establishing a target optimization function, and respectively setting requirements for the average grain size and the recrystallization fraction of the key points, and setting corresponding weight values for the final organization targets of the key points; (4) setting boundary values and a penalty function of process parameters according to the actual situation of forging, and when the inferred process exceeds the boundary, the penalty function starts to execute; (5) embedding the target optimization function and the penalty function into a multi-objective optimization algorithm, and simultaneously inferring multiple forging process parameters. The method can achieve the effect of optimizing the grain organization of multiple regions of a forging, and effectively protects a die, thereby providing a theoretical basis and technical support for realizing high-quality forging.

The invention provides a combined forging method of a hydrogenation reactor shell ring, and relates to the technical field of forging, the combined forging method adopted by the invention comprises the following steps: upsetting a blank, punching, drawing out a core rod, pre-reaming, drawing out and blanking, closing up and drawing out, and reaming to obtain a finished product, so as to obtain a finished product forge piece; a special closing-in sleeve is adopted in the closing-in drawing-out and chambering finished product forming process, a finished forge piece with a straight section in the middle and two closing-in ends can be obtained through the special closing-in sleeve, the finished forge piece is divided, and then two closing-in shell rings with the same straight section size and the same or different closing-in section inner diameters can be obtained. By the adoption of the method, integrated combined forging of the two shell nosing sections with the same straight section size and the same or different shell nosing section inner diameters can be achieved, the total heating number of the forged two shell nosing sections is reduced, the production period is effectively shortened, and therefore the production efficiency can be remarkably improved, the utilization rate of materials can be greatly increased, and the production cost is reduced. And the production requirements of different specifications of closing shell rings can be met.

The utility model relates to the technical field of gear dies, and discloses a gear hot die forging die with a cooling channel, a lower die is mounted at the center of the upper surface of a bottom plate, a positioning column for positioning is fixedly mounted at the side end, corresponding to the lower die, of the upper surface of the bottom plate, and a top plate for supporting is fixedly mounted at the upper end of the positioning column; the upper heat conduction layer is in close contact with the cooling water pipe, and the lower heat conduction layer is connected with the cooling water pipe through a connecting pipe, so that the double heat conduction structure greatly improves the heat conduction efficiency, and the mold can be rapidly cooled in cooperation with the heat dissipation effect of the ventilation opening; and the cooling water pipe, the auxiliary pipe and the annular pipe are arranged in a surrounding manner, so that all parts of the mold can be uniformly cooled, the local overheating or supercooling condition is avoided, the uniformity of a mold temperature field is ensured, and the consistency and stability of gear forming are favorably improved.

The application provides a high-strength rare earth magnesium alloy based on a room-temperature rotary swaging composite process and a preparation method thereof.The method comprises the following specific steps: according to designed components, raw materials are smelted to obtain a semi-continuous casting ingot, the rare earth magnesium alloy ingot is subjected to homogenization treatment, then is preheated and kept warm to be subjected to differential temperature extrusion, the extruded rare earth magnesium alloy is subjected to multi-pass rotary swaging treatment with a small deformation at room temperature, and finally is subjected to artificial aging treatment.Through the composite process with the room-temperature rotary swaging, the grains can be refined, the texture can be improved, and a large number of dislocations and twins can be introduced into the grains, so that the nucleation sites and precipitation power of precipitated phases in the aging process are improved, the aging strengthening capacity is more excellent, and the high-strength rare earth magnesium alloy is obtained.The application of the light-weight high-strength rare earth magnesium alloy in the fields of aerospace, rail transportation and automobiles can be accelerated.

The utility model relates to the technical field of forge piece cutting and separating equipment, in particular to combined forge piece cutting and separating equipment. The combined and forged piece cutting and separating equipment comprises a base; a stand column is installed on the upper end face of the base and connected with a saw frame. A saw band tensioning mechanism and a main transmission mechanism are mounted in the saw frame; the stand column is further connected with a clamping mechanism. The clamping mechanism comprises a driving assembly and a clamping assembly. The saw frame is further connected with a cutting assembly, the cutting assembly comprises a saw blade, a guide groove and a to-be-cut clutch forge piece, the guide groove is formed in the to-be-cut clutch forge piece, and when cutting work is conducted, the saw blade is placed in the guide groove; the driving assembly is used for driving the cutting assembly, and the clamping assembly is used for clamping the clutch forge piece to be cut. By arranging the guide groove, the guide groove can be used for verifying whether the forged piece is installed in an offset mode or not, the cutting position of the saw blade can be conveniently guided, the guide groove has a certain clamping effect on the saw blade in the cutting process, and therefore the situation that the saw blade is cut in an inclined mode in the cutting process is prevented.

A forming tool for a forming tool assembly for producing a cylindrical workpiece has a helical outer contour in multiple stages by means of swaging, the forming tool including a force-application side, a forming side located opposite the force-application side, and a cam structure formed on the forming side. The cam structure has a first forming cam and a second forming cam which are located one behind the other in a longitudinal direction of the forming tool perpendicular to the forming direction. The forming cams have various cam heights and the forming cams have a cam extension direction in an orthogonal view of the forming side, which cam extension direction is oblique in relation to the longitudinal direction of the forming tool. The forming tool is used in a forming tool assembly, a forming machine and a forming method, and a computer program is used to control the forming method.

The utility model relates to a cold rolling middleware of a conical bearing ring, which comprises a circular ring-shaped ring, a cylindrical lower flow guide surface is formed at the lower part of the inner side of the ring, a conical upper flow guide surface is formed at the upper part of the inner side of the ring, and the diameter of the inner wall of the top end of the upper flow guide surface is larger than that of the inner wall of the bottom end of the lower flow guide surface; and the upper flow guide surface in the ferrule is longer than the lower flow guide surface. The ferrule is rolled to obtain a conical bearing outer ring, and a conical assembly surface is formed in the conical bearing outer ring; the area of the upper end face of the conical bearing outer ring is larger than that of the upper end face of the ferrule, the area of the lower end face of the conical bearing outer ring is larger than that of the lower end face of the ferrule, and the areas of the upper end face and the lower end face of the ferrule are reduced by 5%-5.5% compared with those of the upper end face and the lower end face of the conical bearing outer ring. The inner wall of the ferrule is designed into the inner wall combining the conical surface and the cylindrical surface, so that the thickness of the middle of the ferrule is increased, materials in the middle of the ferrule can flow to the two ends of the ferrule in the ring rolling process, and concave surfaces are prevented from appearing on the end faces of the ring after ring rolling.

A method of producing a wire product from a nickel-titanium shape memory alloy, and a wire product produced by such method. The method includes consolidating a nickel-titanium shape memory alloy to a preform using an additive manufacturing process. Thereafter, the preform may be subject to a hot working process, including heating the preform and deforming the preform, such as by, forging, extrusion, rolling, swaging, and the like. The hot-worked preform may be annealed following hot working. The preform may then be subjected to one or more cold working processes including drawing, swaging, rolling, and the like. Annealing may also occur after cold working. The hot and cold working processes may impart significant diameter reduction to form the wire product.

The invention relates to a Zu-Cu alloy preparation process and application based on deformation regulation and control, and relates to the field of biomedical materials, in particular to the field of zinc alloys.The Zu-Cu alloy preparation process comprises the steps that a Zn-Cu ingot blank and calcium carbonate are smelted at the temperature of 450-500 DEG C to obtain a melt, casting is conducted through a semi-continuous casting process, and a Zn-Cu alloy ingot is obtained; and after the Zn-Cu alloy ingot is subjected to homogenization treatment, the Zn-Cu alloy ingot is subjected to rotary swaging, the total deformation of rotary swaging ranges from 64% to 98%, and the Zn-Cu alloy is obtained. According to the method, the yield strength, tensile strength and elongation at break of the alloy are remarkably improved through 64%-98% of the total deformation of rotary swaging and the grain refinement effect caused by large deformation, meanwhile, the corrosion uniformity of the zinc-copper alloy is improved, and precise adaptation of the mechanical property and the degradation rate of the zinc alloy is achieved.

The application discloses a cutter type double-layer casing forging and milling device, which comprises an upper joint, the lower end of the upper joint is connected with a main body through a drill rod buckle, the inner wall of the main body is provided with a flow distribution disc, the middle part of the flow distribution disc is penetrated by a flow limiting rod, the outer wall of the upper end of the flow limiting rod is provided with a flow guide head, the inside of the main body below the flow distribution disc is provided with a piston, the outer wall of the upper end of the piston is fixed with a sealing element, the outer wall of the sealing element is in abutment with the inner wall of the main body, the middle part of the piston is provided with a through hole, the top of the through hole is provided with a flow limiting sleeve, and the top of the through hole above the flow limiting sleeve is provided with a clamping spring. The cutter type double-layer casing forging and milling device can simultaneously perform windowing operation on two layers of casings at one time, improves the workover quality, increases the workover efficiency and generates certain economic benefits.

The present invention relates to a method for manufacturing a rotor shaft (1), in particular a rotor shaft (1) for an electric motor, comprising at least the following steps: (S1) providing a metallic solid bar section as pre-material (V) extending along an axis (X), (S2) bulk forming of the pre-material (V) by extrusion to produce a cup body (N) consisting of a hollow cylindrical side wall section (S) extending axially along the axis (X) and radially circumferentially surrounding an interior space (I), with a hollow cylindrical cross-section unchanged along the axis (X), and a transverse wall section (Q) spanning the interior space (I) radially across the side wall section (S) at an axial position along the axis (X).(S3) Removing the transverse wall section (Q) from the side wall section (S) by a separation process to produce a hollow cylinder body (H) formed (solely) by the side wall section (S), and (S4) rotary swaging of at least one axial section (A) of the hollow cylinder body (H) as seen along the axis (X) to produce the rotor shaft (1). The present invention further relates to a rotor shaft produced according to the method of the invention.

A head gimbal assembly (HGA) for a hard disk drive includes a carriage arm having a swaged bore, first and second suspensions, and respective first and second swaged plates, the first and second suspensions coupled to the first and second swaged plates, respectively. Each swage plate includes a respective respective series of discontinuous swage boss structures extending from the base plate, where the swage boss structures of each swage plate are oppositely positioned and extend from a respective respective side of the arms into the swage holes, and where the swage boss structures of each swage plate are spaced apart from the respective respective side of the arms. And each swaging boss structure in the series of swaging boss structures is inserted into the other series of swaging boss structures. Due to the fact that the two sets of inserted swaging boss structures have the same swaging hole height, the height of each swaging boss can be effectively doubled, and the holding torque of swaging connection can be higher even in view of thinner arm tops and corresponding shorter swaging holes.

The invention relates to the technical field of mechanical buckling and pressing equipment, in particular to an opening buckling and pressing mechanism with centered opening and closing servo power. Comprising a first base body, a second base body, a double-inclined-wedge push block, a servo electric cylinder and a support, one end of the first base body is provided with a first buckling and pressing claw, one end of the second base body is provided with a second buckling and pressing claw, and the two ends of the double-inclined-wedge push block are each provided with two inclined wedge faces. The multi-piece claw is ensured to be concentric with a product during opening and closing, the buckling effect and the product protectiveness are improved, servo electric cylinder driving is adopted, random positioning and stopping can be achieved, positioning is accurate, the operation precision and efficiency are improved, and compared with hydraulic power, servo electric cylinder driving is lower in energy consumption, lower in noise and lower in use cost and maintenance difficulty; and the angles of the two ends of the double-inclined-wedge push block are different, so that the functions of high speed, low speed and pressurization are achieved, large buckling pressure is achieved with small power, and the economical efficiency and practicability of equipment are improved.

The invention discloses a pulsed magnetic field assisted rotary swaging Cu-Be-Pb alloy bar structure refining process, and belongs to the technical field of metal material machining. The process comprises the steps of blank preparation, rotary swaging equipment debugging, pulsed magnetic field parameter setting, multi-pass pulsed magnetic field assisted rotary swaging, finished product treatment and the like. By setting specific pulsed magnetic field parameters, rotary swaging deformation and a machining time sequence, structure refining machining of the Cu-Be-Pb alloy bar is achieved. According to the process, by optimizing the matching mode of rotary swaging and the pulsed magnetic field, the operability of the process is improved, and the process is suitable for batch machining of the Cu-Be-Pb alloy bars.

The application provides a swaging assembly and a swaging device, and belongs to the field of metal forging, wherein the swaging assembly comprises a hammer head, a driving block, a wedge block, a positioning roller and a retaining ring. A plurality of hammer heads are uniformly distributed around a first axis, can rotate around the shaft and move in the radial direction (first direction), the driving block is correspondingly arranged on the outer side of each hammer head, and the driving block drives the hammer head to rotate around the shaft; the wedge block is located between the hammer head and the driving block, converts the axial movement into the radial displacement of the hammer head, and accurately adjusts the forging pressure. The positioning roller is arranged on the outer side of the driving block, can rotate around its own axis and the first axis, and is in rolling fit with the driving block; the retaining ring is coaxially arranged on the outer side of the positioning roller, is in rolling fit with the positioning roller on the inner side to form radial constraint, the wedge block drives the hammer head to apply pressure in the radial direction through axial movement, and the positioning roller and the retaining ring limit the freedom of the driving block. Compared with the prior art, the application solves the technical problem that the existing swaging machine is prone to affecting the stability of the internal structure due to the wear of the roller.

The application discloses a preparation method of a rare earth magnesium alloy rod, and the mass percentage composition of the rare earth magnesium alloy is as follows: Gd: 5.89-6.90%, Y: 3.41-3.90%, Zr: 0.42-0.46, and the rest is Mg. The preparation method comprises the following steps: A, extruding deformation is conducted on the rare earth magnesium alloy to obtain an extruded rod, the extrusion temperature is 430-450 DEG C, and the extrusion ratio is 40-55; B, rotary swaging deformation is conducted on the extruded rod to obtain a rotary swaged rod, the rotary swaging deformation temperature is 0-100 DEG C, and the total deformation amount of the rotary swaging deformation is 20-60%; C, first stage heat treatment is conducted on the rotary swaged rod, the first stage heat treatment temperature is 100-200 DEG C, and the heat preservation time is 24-360 h; and D, second stage heat treatment is conducted on the rotary swaged rod, the second stage heat treatment temperature is 260-340 DEG C, and the heat preservation time is 1-15 min. The application can induce a nano-crystal rare earth magnesium alloy rod to build a multi-scale structure through graded heat treatment, and meanwhile, the strength and plasticity of the rare earth magnesium alloy rod are improved.

The invention discloses a high-carbon niobium-tungsten alloy bar for a fastener and a preparation method of the high-carbon niobium-tungsten alloy bar. The method comprises the following steps: 1, selecting an extruded-state high-carbon niobium-tungsten alloy bar blank which is not damaged by grinding, and carrying out radial forging to obtain a forged bar blank; secondly, the forged bar blank is subjected to scaling and polishing treatment; thirdly, the polished forged bar blank is subjected to room-temperature rotary forging and heat treatment, and a rotary forging blank is obtained; fourthly, the room-temperature rotary swaging and heat treatment processes in the third step are repeated on the rotary swaging blank till the target product size is achieved, and a rotary swaging bar is obtained; and fifthly, the rotary swaging bar is subjected to machining and heat treatment, and the high-carbon niobium-tungsten alloy bar is obtained. According to the method, the extrusion-state high-carbon niobium-tungsten alloy bar blank is machined through the radial forging technology and the rotary forging technology, the technological parameters such as the heating temperature, the deformation amount and the cooling mode are controlled, the yield and the production efficiency are effectively improved, and the high-carbon niobium-tungsten alloy bar good in surface quality, uniform in structure and small in grain size is obtained; the material is suitable for high-temperature fields of fasteners for aerospace and the like.

The invention discloses a high-toughness ultra-fine grain magnesium-lithium alloy bar and a preparation method thereof.The magnesium-lithium alloy bar is composed of, by mass, 2%-5% of Li, 6%-8% of Zn, 1.5%-3.5% of Y and the balance magnesium and inevitable impurities, and the preparation method comprises the steps that firstly, a magnesium-lithium alloy ingot is prepared through vacuum induction melting; 2, cutting a round ingot from the cast ingot; 3, the round ingot is subjected to large-extrusion-ratio hot extrusion machining, and a prefabricated blank is obtained; and fourthly, the prefabricated blank is subjected to liner tube rotary swaging, and the high-toughness ultra-fine grain magnesium-lithium alloy bar is obtained. By combining the vacuum casting-hot extrusion-liner tube rotary swaging process with component design, the machinability of the magnesium-lithium alloy is improved, the magnesium-lithium alloy bar with a smooth and flat surface and no obvious flaws is prepared, meanwhile, ultrafine grains of the bar are uniformly distributed, the obdurability is balanced, the process flow is short, the loss is low, and the production cost is low. The method is suitable for the fields of light high-performance complex structural parts and electric arc additive manufacturing wires.

The invention discloses an internal thread reinforced heat exchange copper pipe and a rotary swaging forming device thereof. The rotary swaging forming device specifically comprises a workbench, a rotary swaging mechanism, a clamping mechanism and a feeding mechanism, wherein the rotary swaging mechanism, the clamping mechanism and the feeding mechanism are arranged on the workbench. The clamping mechanism comprises two clamping assemblies and an opening and closing assembly, the two clamping assemblies are used for clamping copper pipes with different pipe diameters, heat dissipation openings are formed in the clamping assemblies, and the heat dissipation openings are connected with external heat dissipation equipment; the opening and closing assembly is arranged in the heat dissipation opening and used for adjusting the opening size of the heat dissipation opening according to the pipe diameter and the temperature of the copper pipe; the larger the pipe diameter of the copper pipe is, the higher the temperature is, and the larger the opening of the heat dissipation opening is, and the smaller the pipe diameter of the copper pipe is, the lower the temperature is, and the smaller the opening of the heat dissipation opening is. The feeding mechanism is connected with the clamping mechanism and used for driving the clamping mechanism to move in the axial direction of the copper pipe. And through the heat dissipation openings which can be automatically adjusted to be opened and closed along with changes of the pipe diameter and the temperature in the clamping assemblies, refined temperature control is carried out on the copper pipe, the plastic flowing performance of materials is improved, and the stability and consistency of rotary swaging forming of the internal threads are improved.