38results about "Drawing mandrels" patented technology

The present invention relates to a fin tube continuous processing device, which includes a drawing die aligned with the axis of the tube to be processed with fins, the drawing die fixes a floating block inside the tube, the floating block has a free end and the free end is connected to a connecting rod, the downstream end of the connecting rod is connected to an inner core head with a surface provided with textures and can rotate freely around the axis of the tube, and is characterized in that: a blade for rolling the outer fin is provided on the radial outer side of the inner core head, the blade can rotate around the axis of the inner core head, and the blade itself is also rotatable, and a gap is formed between the blade and the inner core head to accommodate the wall of the tube, so that the blade and the inner core head can simultaneously roll the outer surface and inner surface of the tube wall to form the outer fin and the inner fin. The inner and outer fins can be processed continuously.

The utility model discloses an outer wrapping type reelpipe on-line stretching device with dies arranged in sequence, which comprises a base, fixed tables arranged on the left side and the right side above the base, supporting tables arranged on the inner sides of the fixed tables, telescopic cylinders arranged above the supporting tables, traction rods arranged on the front sides of the telescopic cylinders, and traction rods arranged on the front sides of the traction rods. A guide roller is arranged on the inner side of the traction rod, a mold base is arranged in the middle of the upper portion of the base, driving motors are arranged above the mold base in an array mode, the motors and the transmission device are matched so that the inner concave mold and the guide roller can keep rotating synchronously, and the stability and high efficiency of the working process are guaranteed; the corresponding position relation between the guide roller and the internal mold is kept, so that the guide roller sequentially passes through the molds arranged in an array mode, the pipe sleeve and the roller core can be more tightly attached through multiple times of stretching, the attaching degree and stability are improved, the contact area is increased, looseness is reduced, and the production efficiency is improved.

The invention belongs to the technical field of metal processing, and particularly relates to a special-shaped pipe inner expansion type drawing die and a forming method.The special-shaped pipe inner expansion type drawing die comprises a die body in a polygon frustum shape, the die body sequentially comprises an inlet section, a forming section and an outlet section, and the maximum radial size of the inlet section is smaller than the inner diameter of a pipe blank; the maximum radial size of the outlet section is smaller than the inner diameter of a target pipe; at least one edge of the forming section is provided with spherical grooves, the spherical grooves are at least formed in the head end and the tail end of the edge, detachable steel balls are arranged in the spherical grooves, the steel balls are in rolling contact with the inner wall of the pipe blank in the drawing process, and the other edges of the forming section are chamfered; the problems that an existing mold is serious in abrasion, frequent in replacement and high in replacement cost in use, the pipe wall at the corner of a special-shaped pipe manufactured through the existing mold is insufficiently filled, and the quality of the formed pipe is poor are solved.

A method for forming an air return pipe, comprising: controlling a blank (26) to enter a forming cavity, controlling a die core (23) to press the blank (26) such that the blank (26) passes through a first die body (21), and obtaining a first length value of a first formed pipe section formed by the first die body (21); determining that the first length value reaches a first set parameter value, controlling a second die body (22) to press part of the first formed pipe section such that the part of the first formed pipe section is formed into a second formed pipe section, and obtaining a second length value of the second formed pipe section; determining that the second length value reaches a second set parameter value, and controlling the second die body (22) to stop pressing; and controlling a third formed pipe section formed by the first die body (21) to reach a third set parameter value. A forming die (20), comprising the die core (23), the first die body (21) and the second die body (22), wherein the forming cavity is formed between the die core (23) and the first die body (21), the second die body (22) is arranged on one side of a discharge end of the first die body (21) and is provided with a protrusion (223) facing a center of the second die body (22). An air return pipe (10), comprising a first pipe section (11), a second pipe section (12) and a third pipe section (14) which are formed by pressing, wherein the second pipe section (12) is located between the first pipe section (11) and the third pipe section (14), the second pipe section (12) is provided with an accommodation portion, and the accommodation portion is recessed towards a center of the second pipe section (12) and extends in an axial direction of the second pipe section (12). The plurality of pipe sections having different cross-sectional shapes are continuously pressed, so that the plurality of pipe sections are integrally formed, thereby eliminating welding spots between every two adjacent pipe sections, and reducing the leakage risk of the air return pipe.

An apparatus for reducing the cross-section of a tubular hollow body with a hollow body wall has a shaping die on the outer side of the hollow body, a mandrel in the interior of the hollow body, and a shaping drive with a mandrel drive and a die drive. The shaping die is movable by the die drive to reduce a cross-section of the hollow body with an axial movement of the die. The mandrel is movable via the mandrel drive along the hollow body axis through the die opening in the shaping die. The hollow body wall is subjected to a tensile stress by the mandrel and is drawn in the direction of the axial movement of the mandrel through the die opening. The mandrel drive and the die drive are controlled so that the axial mandrel movement and the axial die movement die are superimposed on one another.

The present invention discloses a three-way pipe forming machine for ejecting the side pipe orifice of an outward-turned water pipe, which includes a clamping device for fixing the water pipe, an ejecting mechanism corresponding to the clamping device, and a moving device. The ejecting mechanism is inserted into the water pipe through the moving device. Among them, the clamping device includes a clamping die for clamping the water pipe and a pressure-bearing member arranged in the clamping die. The clamping die is provided with a top extension channel corresponding to the side pipe orifice, and the pressure-bearing member is provided with a pressed arc surface corresponding to the top extension channel. The ejecting mechanism includes a top rod installed on the moving device and a swinging member hinge-connected to the top rod. One end of the swinging member is provided with a spherical portion. After the spherical portion contacts the pressed arc surface, it turns towards the top extension channel to form the side pipe orifice into a tubular shape. By adopting the present invention, the structure is simple, the production efficiency is high, and there is no need to repeatedly disassemble the pulling parts.

It is an object of the present invention to provide a method, apparatus and drawing mandrel that allows the forming process to be monitored in as much detail as possible. This object is achieved by a drawing machine and a drawing method for producing or processing a tube extending in a longitudinal extension direction from a semi-finished product. The drawing machine comprises a drawing device for drawing a hollow workpiece formed in a longitudinal extent by the tube and the semi-finished product, a drawing ring, and a drawing mandrel. The drawing machine acts to shape the workpiece via the drawing mandrel and the drawing ring while the workpiece is drawn by the drawing device around the drawing mandrel and through the drawing ring. The drawing machine is characterized by a sensor located on the drawing mandrel, or by a physical property being measured inside the workpiece and / or on the drawing mandrel by a sensor provided on the drawing mandrel.

The device (1) for reducing the cross-section of a tubular hollow body (2) having a hollow body wall (3) made of a plastically deformable material and a hollow body axis (4) extending in the longitudinal direction of the hollow body (2) comprises a forming die (5) for arrangement on the outer surface of the hollow body (2), a mandrel (6) for arrangement inside the hollow body (2), and a forming drive (8) including a mandrel drive (9) and a die drive (10). The forming die (5) is provided with a die opening (7) having an opening cross-section smaller than the hollow body cross-section of the hollow body (2) in the starting state. The forming die (5) arranged on the outer surface of the hollow body (2) is movable relative to the hollow body (2) in the direction of the axial die movement (14) along the hollow body axis (4) by means of the die drive (10) while reducing the cross-section of the hollow body (2). A mandrel (6) arranged inside the hollow body (2) is movable along the hollow body axis (4) with an axial mandrel movement counter to the axial die movement by means of a mandrel drive (9). In this case, the hollow body wall (3) is subjected to a tensile load by the mandrel (6) in the direction of the axial mandrel movement (13), and the hollow body wall (3) is pulled through the die opening (7) in the direction of the axial mandrel movement (13) against a forming die (5) arranged on the outer surface of the hollow body (2). By means of a drive control device (11) of the forming drive (8), the mandrel drive (9) and the die drive (10) can be controlled so that the axial mandrel movement and the axial die movement are superimposed on each other. By means of the above-mentioned device (1), a method for reducing the cross-section of a tubular hollow body (2) is carried out.

The utility model provides an automatic positioning tool for pipe orifice drawing, which relates to the technical field of pipe orifice drawing tools and comprises a fixing frame for fixing a workpiece, the center of the top edge of the fixing frame is hollowed out, the inner bottom of the fixing frame is fixedly connected with a longitudinally arranged electric telescopic rod, and a spiral seat is mounted at the telescopic end of the electric telescopic rod. A plurality of sets of telescopic mechanisms are inserted into the upper surface of the spiral base, a center inserting column is fixedly connected to the center of the upper surface of the spiral base, and the telescopic mechanisms are arranged to achieve that the multiple combination plates are folded around the center inserting column, so that the multiple combination plates can conveniently penetrate through a preset pipe opening in the surface of a workpiece along with extension of the electric telescopic rods. And a plurality of composition plates are combined to form the drawing die in the workpiece or on the other side through stretching and unfolding of the telescopic mechanism, then the drawing die descends along with contraction of the electric telescopic rod, drawing of the pipe opening is achieved through the pipe opening preset in the surface of the workpiece, the drawing die does not need to be disassembled and assembled repeatedly, and time is saved.

The utility model discloses a solid inner die device for a cold-drawn pipe, which belongs to the technical field of cold-drawn pipes, and comprises a core rod, the end part of the core rod is rotatably connected with a solid inner die, the core rod comprises a front rod, a middle rod and a tail rod, the end part of the middle rod is in threaded connection with the inside of the tail rod, and the end part of the middle rod is in threaded connection with the inside of the tail rod. A front rod is slidably connected to the interior of the middle rod, a connecting rod is fixedly connected to the end of the front rod, a sliding block is fixedly connected to the outer surface of the connecting rod, internal threads are arranged on the inner side wall of the middle rod and the inner side wall of the tail rod, and a first external thread and a second external thread are arranged on the outer surface of the connecting rod. And the first external thread and the second external thread respectively correspond to the internal thread in the middle rod and the internal thread in the tail rod in position. And through arrangement of a connecting rod, a sliding block, a first external thread and a second external thread, the practicability of the device is improved, and through arrangement of a connector and a mounting groove, the convenience of replacement of the solid inner mold is improved.

The present invention addresses the problem of providing an inner grooved pipe for flare processing in which cracking due to tube expansion from flare processing is unlikely to occur. The problem is solved by an inner grooved pipe for flare processing, which is a seamless pipe, that has grooves in the inner surface thereof, and flare processing applied to an end thereof, wherein: the outer diameter D is 2.0-5.5 mm; the ratio T / D between the wall thickness T and the outer diameter D is 0.057-0.005 D to 0.075-0.005 D; the twist angle θ of the inner groove is 15-27 degrees; the tip radius of curvature r of fins constituting the inner grooves and the number N of the fins in the circumferential direction satisfy a specific formula; and the tip radius of curvature r and the twist angle θ satisfy a specific formula.

The utility model relates to the technical field of cold drawing of guide pipes, and provides an integral solid inner die for cold drawing of an inclined guide pipe for petroleum, which comprises a mounting box, the top of the mounting box is rotatably connected with a rotating shaft, and the top of the rotating shaft is fixedly connected with a rotating rod; by arranging a first inner mold, a second inner mold can be embedded into a material guide pipe firstly, then the first inner mold is installed on the side face of an installation box through a screw, a chain is started to enable the first inner mold to be embedded into the material guide pipe, then a rotating shaft is controlled to rotate through a servo motor, and then through combined movement of a rotating rod, a sliding column and a transmission plate, the first inner mold is embedded into the material guide pipe. The chain is started again to drive the two sets of fixing plates to fix the material guide pipe, the chain is started again to enable the fixing plates to draw the material guide pipe, at the moment, the material guide pipe can be slowly separated from the second inner die, and due to the fact that the first inner die is located in the material guide pipe all the time, the phenomenon that a pipe opening of the material guide pipe deforms due to the extrusion force of the fixing plates can be prevented; therefore, the purpose of reducing the occurrence rate of defective products is achieved.

The present invention addresses the problem of providing an inner grooved pipe for flare processing in which cracking due to tube expansion from flare processing is unlikely to occur. The problem is solved by an inner grooved pipe for flare processing, which is a seamless pipe, that has grooves in the inner surface thereof, and flare processing applied to an end thereof, wherein: the outer diameter D is 2.0-5.5 mm; the ratio T / D between the wall thickness T and the outer diameter D is 0.057-0.005 D to 0.075-0.005 D; the twist angle θ of the inner groove is 15-27 degrees; the tip radius of curvature r of fins constituting the inner grooves and the number N of the fins in the circumferential direction satisfy a specific formula; and the tip radius of curvature r and the twist angle θ satisfy a specific formula.

This invention relates to the field of copper tube drawing technology, specifically to a production equipment for drawing copper tubes. The equipment includes an internal oiling mechanism, a straightening mechanism, a pre-forming mechanism, a drawing die, and a cutting mechanism. The drawing die includes an outer die and a moving mandrel. The outer die includes a die sleeve and a die core. An axial through hole is formed on the die sleeve, and the die core is embedded in the through hole. The die core has a tapered mandrel hole that communicates with the through hole. The cross-section of the mandrel hole is cross-shaped and is used to mate with the moving mandrel. The moving mandrel includes a large-diameter section, a small-diameter section, and a transition section. The transition section smoothly connects the large-diameter section and the small-diameter section. The cross-sectional shape of the moving mandrel is the same as the cross-sectional shape of the mandrel hole. This invention solves the problem of low production efficiency in existing drawing methods.

The invention discloses high-precision cold-drawing equipment for a high-strength high-toughness corrosion-resistant stainless steel seamless steel pipe, which comprises a cold-drawing die seat, a core-penetrating conveying vehicle body, a chained cold-drawing vehicle body, a drawing chain wheel vehicle and a chained transmission mechanism, and is characterized in that the cold-drawing die seat is fixedly mounted between the core-penetrating conveying vehicle body and the chained cold-drawing vehicle body; the core penetrating conveying vehicle body and the chain type cold drawing vehicle body are fixedly installed together, a drawing chain wheel vehicle is installed on the chain type cold drawing vehicle body in a sliding mode and located above the chain type transmission mechanism, and the chain type transmission mechanism is installed on the chain type cold drawing vehicle body. According to the revolutionary self-adaptive core rod design, uniform expansion and tight attachment to the inner wall of the steel pipe are achieved through a high-pressure and high-density liquid medium, deformation and frictional wear are reduced, and the pipe quality and the production efficiency are improved. The one-way circulation hydraulic system ensures accurate inlet and outlet of liquid, and bad backflow is avoided. And the steel pipe limiting mechanism improves the sleeving precision, prevents deformation and ensures smooth and efficient cold drawing.

The embodiment of the invention provides a feeding mechanism and a multi-line synchronous cold drawing machine, and relates to the technical field of steel pipe cold drawing. The feeding mechanism comprises a conveying roller, a feeding conveying assembly and a feeding support. A feeding roller, a limiting baffle and a positioning baffle are arranged on the feeding support. The limiting baffle comprises a material conveying slope and a first baffle, and a plurality of second baffles are arranged on the positioning baffle at intervals. The baffles are all located above the feeding roller and can independently control the lifting and putting down actions of the feeding roller. And through programmed cooperation of the baffles, 1-5 steel pipes can be accurately positioned at uniformly distributed preset positions. The multi-line synchronous cold-drawing machine is integrated with the feeding mechanism and is sequentially connected with a core rod pre-penetrating mechanism and a cold-drawing mechanism, so that full-process automatic production is realized. The problems of uneven stress, poor product precision and the like caused by uneven distribution of the steel pipes during multi-wire drawing are solved, and the production flexibility, efficiency and product quality are remarkably improved.

The present invention relates to the technical field of copper tube processing, and specifically to a special-shaped copper tube stretching die that can be quickly positioned, comprising a processing platform, a supporting plate is arranged above the processing platform, two groups of positioning plates are arranged above the supporting plate, an adjustment mechanism is arranged on the outside of the supporting plate and the two groups of positioning plates, a mold shell is fixedly installed above the processing platform, a cavity is opened inside the mold shell, a mold core is movably inserted inside the cavity, and a positioning mechanism is arranged on the outside of the mold core. This special-shaped copper tube stretching die that can be quickly positioned can quickly position copper tubes of different sizes by arranging a supporting plate and two groups of positioning plates, so that the center of the copper tube and the center of the mold shell are always on the same horizontal plane, which is conducive to ensuring the processing effect, and is suitable for processing copper tubes of different sizes, expanding the scope of application of the device, and can improve the processing efficiency.

The invention relates to the technical field of metal drawing forming, in particular to a decorative aluminum profile automatic drawing forming machine and method.The decorative aluminum profile automatic drawing forming machine comprises an aluminum profile and a supporting cylinder, a plurality of installation faces are constructed on the aluminum profile, a plurality of through cavities are constructed in the aluminum profile, and partition plates are symmetrically arranged in the supporting cylinder; a stretching cavity is formed between the two partition plates in the supporting cylinder, a plurality of driving shafts distributed in the circumferential direction are arranged between the two partition plates in a penetrating mode, and a stretcher used for stretching the aluminum bar is arranged in the supporting cylinder; stretching of the connecting ring and extruding of the core punching rod are conducted synchronously, synchronous forming of the appearance and an inner cavity of an aluminum profile is achieved, in the process, the core punching rod has the heating function, the aluminum bar can be locally heated through the heating function of the core punching rod, the plasticity of the aluminum bar is improved, the deformation resistance is reduced, the aluminum bar is prone to plastic deformation, and the service life of the aluminum bar is prolonged. Therefore, plasticity is improved, deformation resistance is reduced, forming precision is improved, and extrusion force is reduced.

The present invention belongs to the technical field of automatic core lining in the process of high-precision pipe drawing, and provides an automatic core lining device for the end of a precision drawn metal pipe, which includes two cylinders arranged on a drawing trolley: a first cylinder and a second cylinder. The first cylinder is connected to a clamp through a connecting mechanism and is used to control the opening and closing of the clamp. A core is arranged at the end of the telescopic rod of the second cylinder to achieve automatic core lining. The present invention uses two cylinders to respectively achieve clamping of the pipe end and automatic core lining. During production, the second cylinder pushes the core into the pipe end, and the first cylinder drives the clamp to clamp the pipe end to achieve automatic core lining. After the drawing operation is completed, the two cylinders retract, and then the second automatic core lining operation is carried out. Compared with the existing manual core lining, the production efficiency of the present invention is higher, the quality is better, and there are no safety hazards.

The invention relates to the technical field of pipe machining, in particular to a thin-diameter pipe reducing drawing machining device which comprises a rack, a rolling unit and a lifting unit, the rolling unit and the lifting unit are arranged on the rack and oppositely distributed, and a thin-diameter pipe is spirally wound on the rolling unit. The rolling unit comprises two first transmission columns which are oppositely distributed and a first extrusion belt which is arranged on the two first transmission columns in a transmission mode. By means of the pipe rolling and lifting device, the problem that pipes and molds are abraded when the pipes are machined in a traditional mode is effectively solved, the pipes between the rolling unit and the lifting unit are rolled, the continuous and active conveying function of the pipes can be achieved, continuous production of the pipes is achieved, and production efficiency is improved. And meanwhile, both the rolling unit and the lifting unit can be in surface contact with the pipe, so that the deformed pipe can be extruded and shaped within specified time.

To provide methods, apparatuses and drawing mandrels in which the shaping process can be monitored as closely as possible, a drawing machine and a drawing method manufactures or processes tubes, which extend in the direction of longitudinal extent, from a semi-manufactured product, wherein the drawing machine includes a drawing device for drawing a hollow workpiece formed by the tube and the semi-manufactured product in the direction of longitudinal extent, a drawing ring and a drawing mandrel and acts on the workpiece in a shaping manner via the drawing mandrel and the drawing ring while the workpiece is drawn by the drawing device around the drawing mandrel and through the drawing ring. A sensor is located on the drawing mandrel, or physical properties are measured in the interior of the workpiece and / or on the drawing mandrel using a sensor on the drawing mandrel.

The application relates to the technical field of refrigeration equipment, and provides a forming method of a return air pipe, a forming die and the return air pipe. The forming method of the return air pipe comprises the following steps: controlling a blank to enter a forming cavity, controlling a die core to extrude the blank, making the blank pass through a first die body, and obtaining a first length value of a first formed pipe segment formed through the first die body; determining whether the first length value reaches a first set parameter value, controlling a second die body to extrude part of the first formed pipe segment, making part of the first formed pipe segment be formed into a second formed pipe segment, and obtaining a second length value of the second formed pipe segment; determining whether the second length value reaches a second set parameter value, and controlling the second die body to stop extruding; and controlling a third formed pipe segment formed by the first die body to reach a third set parameter value. The application can continuously extrude multiple pipe segments with different cross-sectional shapes, so that the multiple pipe segments are integrally formed, the welding points between the adjacent two pipe segments are cancelled, and the leakage risk of the return air pipe is reduced.

The utility model relates to the technical field of stainless steel tube preparation, in particular to a floating core head for drawing a stainless steel capillary tube, which comprises an outer mold and a floating inner core, the outer mold comprises a mold body and a core hole for forming a capillary tube; the core hole comprises a tube inlet hole, a transition forming hole and a tube outlet hole according to the entering direction of the capillary tube; the floating inner core is of a solid cylinder structure, one end of the floating inner core is a working section, the other end of the floating inner core is a core tail section, and the working section and the core tail section are connected through an inclined transition section. During drawing, the stainless steel capillary tube internally provided with the floating inner core sequentially penetrates through the tube inlet hole, the transition forming hole and the tube outlet hole of the outer mold; and the floating inner core is clamped in the transition forming hole. The production efficiency of the stainless steel capillary tube is greatly improved through drawing of the moving core head, the structure is simpler, the depoling procedure is omitted, and damage to the inner wall of the tube is reduced.

The invention discloses a drawing device for forming a variable-diameter inner wall steel pipe, which comprises an outer mold and a variable-diameter drawing mechanism, and the variable-diameter drawing mechanism comprises: a fixed part arranged in the outer mold; the adjusting component is in sliding fit with the fixing component; the variable-diameter part is arranged on one side of the fixing part, the variable-diameter part is driven by the adjusting part to achieve variable diameter, the variable-diameter part comprises a core head guide ring, a fixing mandrel and a variable-diameter core head, the core head guide ring is arranged on the fixing mandrel in a sliding mode, and the variable-diameter core head is in sliding fit with the core head guide ring; and the adjusting part drives the core head guide ring to move along the fixed core shaft to change the relative position of the reducing core head and the core head guide ring so as to realize reducing. The diameter of the variable-diameter core head is changed by adjusting the position of the core head guide ring, machining of pipes with the constant outer diameter and the thinned middle section wall thickness can be achieved, meanwhile, the device can adapt to machining of pipes with different pipe wall thicknesses, use is convenient, cost is low, and production is facilitated.

The invention discloses a quick adjustment device for a core rod of a trolley, comprising a core rod and a tailstock welded vertically upward on the bed of a horizontal trolley, wherein a U-shaped groove with a notch facing upward is provided at the top of the tailstock along the length direction of the bed, and an inclined groove with the same width as the notch of the U-shaped groove and inclined upward is provided below the U-shaped groove along the length direction of the bed; a hollow external threaded tube with the same outer diameter as the notch width and the external threaded tube is clamped in the notch of the U-shaped groove and the inclined groove, and the external threaded tube is located on the left and right sides of the notch and is respectively threadedly connected with a left large nut and a right large nut; the tail end of the core rod passes through the center hole of the external threaded tube and is threadedly connected with a nut for preventing the core rod from being pulled out of the external threaded tube. The invention can not only realize the simultaneous fixing of multiple core rods, thereby improving the efficiency of drawing aluminum alloy tubes, but also conveniently realize the rapid adjustment of the front and rear positions of the core head and the rapid replacement of core rods of different specifications, further improving the efficiency of drawing aluminum alloy tubes.

The application belongs to metal drawing forming device, specifically a kind of pulse current assisted metal pipe drawing forming device, including base, fixed on the drawing frame of base, install the electric push cylinder in drawing frame one end, with the connecting head of electric push cylinder telescopic end connection, with the clamp for clamping pipe blank connected with connecting head, install the drawing die in drawing frame front end, fixed in the core rod fixed platform core rod, set up in the core rod rear end core rod connecting part, seal cover and with the gas cylinder that communicates with seal cover, and current output device, control console;Device is equipped with first loop and second loop, first loop is used to test current output, and second loop is used for pulse current output;The one end of pipe blank is provided with electrically conductive sleeve, and the electrically conductive sleeve is fixedly arranged on the core rod connecting part, the resistance of test current measurement loop is measured, and the preset current pulse output is corresponded, so that the equipment can independently switch pulse current parameter.

The invention discloses a thin-wall special-shaped pipe hollow and lining core double-die composite drawing device and method, and relates to a composite drawing device and method. The invention aims to solve the problem that the traditional hollow core drawing or lining core drawing mode still has the defects of insufficient size precision, non-uniform pipe wall thickness and drawing fracture caused by overlarge section shrinkage. The device comprises a first die sheath and a second die sheath which are sequentially and coaxially arranged from left to right, a first drawing die is fixedly embedded in the first die sheath, a second drawing die is fixedly embedded in the second die sheath, a blank sequentially penetrates through the first drawing die and the second drawing die from left to right, a core head is arranged in the blank, and a first drawing die and a second drawing die are arranged in the core head. A connecting rod is arranged at the left end of the core head. The invention belongs to the technical field of thin-wall special-shaped pipe machining.

The invention discloses a difficult-to-deform metal microcapillary ball spinning forming device and method, and relates to the technical field of metal forming, and the forming device comprises a spinning mold III and a transmission system V; the spinning die III comprises a core rod, a rolling assembly and a supporting assembly. The core rod is used for supporting a tube blank of the metal microtube from the inner side and is in clearance fit with the tube blank. The rolling assembly comprises a rotating body and balls, the rotating body is provided with a center hole and a cavity with the inner side face being a cylindrical face, and the core rod and the pipe blank penetrate through the center hole. The at least three balls are limited in the cavity, evenly distributed in the circumferential direction of the pipe blank and used for spinning the pipe blank conveyed in the axial direction under driving of the rotating body. The rotating body and the supporting assembly are rotationally connected with the center hole as the center. The transmission system V is in transmission connection with the rotating body and used for driving the rotating body to rotate. Compared with the prior art, the friction force and the deformation resistance of the deformation area can be effectively reduced, the mobility of accumulated metal in the deformation area is promoted, and the microcapillary with high precision and excellent quality is prepared.