13results about "Drawing mandrels" patented technology

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.

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 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 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.

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 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 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.

The hydraulic cold-drawing machine with built-in centering device comprises a die seat provided with an outer die, a tail seat, a driving assembly arranged on the tail seat and configured to drive a straight movement of a core rod, a middle part of the core rod is composed of at least three main body sections, the diameters of the main body sections decrease step by step from the tail seat to the die seat, each main body section is slidably connected with a support block, when the core rod moves away from the outer die, the support block moves to the position of the main body section with the smallest diameter under the block of the tail seat, when the core rod moves to the outer die through the material pipe, the support block moves to the tail seat and abuts against the connecting step surface of the adjacent main body section in sequence, the support block is slidably arranged on the core rod, the abutting cooperation between the outer circumferential surface of the support block and the inner wall of the material pipe provides uniform radial support for the material pipe, the coaxial state of the material pipe and the core rod is forced, and the coaxiality of the material pipe and the drawing groove is indirectly ensured.

The application discloses a manufacturing method of a steel pipe cold-drawing die. The manufacturing method of the steel pipe cold-drawing die comprises the following steps: collecting process parameters of a reference steel pipe in an actual cold-drawing manufacturing process; establishing a reference die simulation model based on parameters of the reference die and a reference steel pipe simulation model based on parameters of the reference steel pipe before cold-drawing, performing mesh division on the reference steel pipe simulation model, and performing a steel pipe cold-drawing finite element analysis to obtain a finite element basic model; and substituting initial parameters of a target die and initial parameters of a target steel pipe into the finite element basic model, performing a cold-drawing finite element analysis, and improving the initial parameters of the target die with a product quality parameter as an optimization target to obtain optimized parameters of the target die, and then obtaining a simulation model of the target die. Compared with a large number of trial dies in the prior art, the manufacturing method of the steel pipe cold-drawing die can reduce production cost.