A rod continuous drawing device and a drawing method

Abstract

The invention discloses a continuous drawing device for rods, comprising a frame, a guide rail is provided on the frame, a drawing mechanism is provided on the guide rail, the drawing mechanism comprises a drawing vehicle which reciprocates on the guide rail, an automatic clamp is provided on one side of the drawing vehicle, a drawing die seat is provided on the side close to the automatic clamp frame, a guide cavity penetrating the die seat is provided on the drawing die seat, a first die core is provided on the drawing die seat corresponding to the inlet end of the guide cavity, a first drawing hole penetrating the die core is provided on the first die core and is connected with the inlet end of the guide cavity, a second die core is provided on the drawing die seat corresponding to the outlet end of the guide cavity, a second drawing hole penetrating the die core is provided on the second die core and is connected with the outlet end of the guide cavity; high-strength materials complete one cold drawing by two continuous drawing, which can increase the surface reduction rate, improve the strength, and avoid the risk of stress cracking caused by one large deformation.

Description

Technical Field

[0001] The invention relates to the technical field of cold drawing dies, and in particular to a bar continuous drawing device and a drawing method. Background Art

[0002] Drawing of metal materials is an important means of material processing, which can achieve the three purposes of material strengthening, sizing and surface reduction. In the existing drawing technology, the drawing of metal materials mainly goes through two processes, namely, heading and drawing. For straight bars, the heading is generally made by manual cold rolling or hot rolling outside the line. Then the automatic clamp of the chain drawing machine is used to clamp the bar head, and the process is as follows: drawing-empty car return-drawing-empty car return and then drawing. In this reciprocating intermittent manner, the drawing production process is realized; but when the surface reduction rate of the bar is greater than 20%, it is generally necessary to go through multiple cold drawing passes, which is time-consuming and labor-intensive; if the surface reduction rate of a cold drawing is greater than 20%, a large deformation increases the risk of stress cracking of the bar. Summary of the invention

[0003] The purpose of the present invention is to solve the above technical problems and to provide a continuous drawing device and a drawing method for rods. Multiple cold drawing is time-consuming and labor-intensive. High-strength materials can be cold drawn once through two continuous drawing steps, which can improve the strength and reduce the risk of stress cracking caused by a large deformation.

[0004] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a continuous drawing device for rods, comprising a frame, a guide rail is provided on the frame, a drawing mechanism is provided on the guide rail, the drawing mechanism includes a drawing car that reciprocates on the guide rail, an automatic clamp is provided on one side of the drawing car, and a drawing die seat is provided on the side of the frame close to the automatic clamp, the drawing die seat is provided with a guide cavity penetrating the die seat, the drawing die seat is provided with a first mold core corresponding to the inlet end of the guide cavity, the first mold core is provided with a first drawing hole penetrating the mold core and connected with the inlet end of the guide cavity, the drawing die seat is provided with a second mold core corresponding to the outlet end of the guide cavity, the second mold core is provided with a second drawing hole penetrating the mold core and connected with the outlet end of the guide cavity, and the aperture of the first drawing hole is larger than the aperture of the second drawing hole.

[0005] In order to increase the interval time between the first drawing and the second drawing and increase the distance between the first mold core and the second mold core, a further preferred technical solution is that the second mold core and the corresponding second drawing mold seat are separated from the first mold core and the corresponding drawing mold seat, and the second mold core and the corresponding second drawing mold seat are slidably arranged on the guide rail.

[0006] In order to enable the second drawing die seat corresponding to the second mold core to automatically connect or disconnect with the drawing car, a further preferred technical solution is that a hinge seat is provided on the side of the second drawing die seat corresponding to the second mold core close to the drawing car, and an electromagnetic locking mechanism is provided on the side corresponding to the drawing car, and the electromagnetic locking mechanism includes a pair of upper clamps and a lower clamp, and the hinge seat can be inserted between the upper clamp and the lower clamp, and the upper clamp is provided with a through hole corresponding to the hinge seat hole, and a chuck is provided in the through hole, and the chuck is a stepped cylinder, and a spring is mounted on the cylinder between the end of the chuck away from the upper clamp and the side of the upper clamp, and an electromagnet is provided on the lower side of the lower clamp to cooperate with the chuck.

[0007] In order to control the movement distance of the second drawing die seat corresponding to the second mold core so that there is an appropriate distance between the first mold core and the second mold core, a further preferred technical solution is that a pair of positioning telescopic blocks are provided on the guide rail, and the positioning telescopic blocks are driven by the first cylinder to vertically reciprocate up and down in the guide hole of the guide rail, and a first position sensor is provided on the frame of the drawing mechanism on one side corresponding to the positioning telescopic block, and the first position sensor is electrically connected to the controller, and the controller is electrically connected to the solenoid valve on the first cylinder through a wire, and the controller is electrically connected to the relay on the electromagnet through a wire, and the controller adopts a CPU controller.

[0008] In order to position the second drawing die seat corresponding to the second mold core, a further preferred technical solution is that clamping devices are respectively provided on both sides of the drawing mechanism frame corresponding to the positioning telescopic block, and the clamping device on each side includes a double-headed fork, the middle part of the double-headed fork is hinged to the frame, the lower end of the double-headed fork is hinged to the end of the piston rod of the second cylinder, and the base of the second cylinder is hinged to the frame.

[0009] A method for continuous drawing of a bar, comprising the following steps: S1: placing a rolled bar on a turntable, and then manually rolling one end of the bar into a shape through one side of a first die core of the bar continuous drawing device sequentially passing through a first drawing hole, a guide cavity, and a second drawing hole, and then clamping the end through an automatic clamp of a drawing vehicle;

[0010] S2: The drawing car moves from the initial position to the end position along the guide rail, and draws the bar through the first mold core and the second mold core twice in succession. After the drawing car reaches the end position, the automatic clamp is released, and then the drawing car returns to the initial position along the guide rail and then automatically clamps the bar, and then moves from the initial position to the end position, and draws the bar through the first mold core and the second mold core twice in succession;

[0011] S3: Repeat step S2 until a roll of rod on the disc machine is drawn and formed.

[0012] In order to increase the interval time between the first drawing and the second drawing, increase the distance between the first mold core and the second mold core, and optimize the surface strength by drawing again after cooling after one drawing, a further preferred technical solution is:

[0013] In step S1: the rolled bar is placed on a turntable, and one end is manually rolled into shape, and passes through the first drawing hole, the guide cavity, and the second drawing hole in sequence from one side of the first die core, and then the end is clamped by the automatic clamp of the drawing car, and the drawing car is fixedly connected to the second drawing die seat corresponding to the second die core by the electromagnetic locking mechanism;

[0014] In step S2: the drawing vehicle is started by the controller, and the drawing vehicle drives the second drawing die seat corresponding to the second die core to draw the rod along the guide rail to the end position, and the rod passes through the first die core for one drawing, and when the drawing vehicle travels to the position of the first position sensor, the first position sensor feeds back the position signal to the controller, and the controller controls the electromagnetic locking mechanism through the relay to disconnect the connection between the drawing vehicle and the second drawing die seat, and at the same time controls the action of the first cylinder through the electromagnetic valve, and the positioning telescopic block is driven by the first cylinder to extend from the bottom of the guide hole on the guide rail to the upper end surface of the guide rail to block the second drawing die seat. The drafting seat controls the action of the second cylinder through the electromagnetic valve, and the double-headed fork clamps the second drafting die seat from both sides of the second drafting die seat under the drive of the second cylinder, and then the drawing car continues to draw the bar to the end position, and the bar passes through the second die core for secondary drawing of the bar, and the bar is drawn through the first die core and then cooled, and then drawn and formed twice continuously through the second die core; after the drawing car reaches the end position, the automatic clamp is released, and then returns to the position of the first position sensor along the guide rail and then automatically clamps the bar, and then draws to the end position, and the bar is drawn and formed twice continuously through the first die core and the second die core;

[0015] In step S3: after the drawing vehicle in step S2 reaches the end position, the automatic clamp is released, and then returns to the position of the first position sensor along the guide rail and then automatically clamps the bar, and then draws it to the end position, and the bar is drawn and formed twice continuously through the first mold core and the second mold core until a roll of bars on the disc machine is drawn and formed.

[0016] In order to improve the surface strength of the rod after drawing, a further preferred technical solution is that in step S2: cooling is performed by air cooling between the second drawing and the first drawing.

[0017] Compared with the prior art, the beneficial effects of the present invention are: 1. Multi-pass cold drawing is time-consuming and labor-intensive. High-strength materials can complete one cold drawing through two consecutive drawing steps, which can increase the surface reduction rate, improve the strength, and avoid the risk of stress cracking caused by a large deformation; 2. By increasing the interval time between the first drawing and the second drawing, the surface of the bar after the first drawing is cooled to form a reinforcement, and then after the second continuous drawing, the surface reduction rate can be increased to improve the strength and improve the surface quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a front view of the fixing structure of the second mold core and the drawing mold base of the present invention;

[0019] Figure 2 It is a front view of the separation structure of the second mold core and the drawing mold base of the present invention;

[0020] Figure 3 It is a front view of the structure in which the second mold core and the drawing mold base are separated and drawn to the end position of the present invention;

[0021] Figure 4 For the present invention Figure 2 A partial enlarged view of middle A;

[0022] Figure 5 For the present invention Figure 3 Side view of the middle clamping device;

[0023] In the figure: 1. frame; 2. guide rail; 3. drawing mechanism; 31. drawing car; 32. automatic clamping pliers; 4. rod; 5. second die core; 51. second drawing hole; 52. second drawing die base; 6. drawing die base; 61. guide cavity; 7. first die core; 71. first drawing hole; 8. first position sensor; 9. guide hole; 91. positioning telescopic block; 92. first cylinder; 10. clamping device; 101. double-headed fork; 102. second cylinder; 11. electromagnetic locking mechanism; 111. chuck; 112. spring; 113. upper clamp; 114. lower clamp; 115. electromagnet; 116. hinge seat. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Example

[0025] like Figure 1As shown, a continuous drawing device for a bar comprises a frame 1, a guide rail 2 is arranged on the frame, a drawing mechanism 3 is arranged on the guide rail 2, the drawing mechanism 3 comprises a drawing vehicle 31 which reciprocates on the guide rail 2, an automatic clamp 32 is arranged on one side of the drawing vehicle 31, a drawing die seat 6 is arranged near the automatic clamp 32, a guide cavity 61 which passes through the drawing die seat 6 is arranged on the drawing die seat 6, the outlet end of the guide cavity is a tapered necking with a gradually decreasing aperture, a circular groove is arranged on the drawing die seat 6 corresponding to the inlet end of the guide cavity 61, and the circular groove is fixedly mounted with a first die Core 7, the first die core 7 is provided with a first drawing hole 71 penetrating the die core and communicating with the inlet end of the guide cavity 61, the outlet end of the guide cavity 61 corresponds to the drawing die seat 6 and is provided with a second die core 5 fixed to the drawing die seat 6, the second die core 5 is provided with a second drawing hole 51 penetrating the die core and communicating with the outlet end of the guide cavity 61, the aperture of the first drawing hole 71 is larger than the aperture of the second drawing hole 51, under the traction of the drawing mechanism, the rod continuously passes through the first drawing hole 71 and the second drawing hole 51, and the surface reduction rate of the finished product of one drawing is achieved by more than 20%, and the surface hardness is improved.

[0026] like Figure 2 As shown, in order to increase the interval time between the first drawing and the second drawing, the distance between the first mold core and the second mold core is adjustable, and further, the second mold core 5 and the corresponding second drawing mold seat 52 are separated from the first mold core 7 and the corresponding drawing mold seat 6, and the second mold core 5 and the corresponding second drawing mold seat 52 are slidably arranged on the guide rail 2;

[0027] like Figure 2 and Figure 4As shown, in order to enable the second drawing die seat 52 corresponding to the second mold core 5 to automatically connect or disconnect with the drawing vehicle 31, further, a hinge seat 116 is provided on the side of the second drawing die seat 52 corresponding to the second mold core 5 close to the drawing vehicle 31, and an electromagnetic locking mechanism 11 is provided on the side corresponding to the drawing vehicle 31. The electromagnetic locking mechanism 11 includes a pair of upper clamping plates 113 and a lower clamping plate 114. The hinge seat 116 can be inserted between the upper clamping plate 113 and the lower clamping plate 114. A through hole corresponding to the reaming hole of the hinge seat 116 is provided on the upper clamping plate 113. A chuck 111 is provided in the through hole. The chuck 11 is a stepped cylinder with a T-shaped structure. The chuck 11 is away from the upper clamping plate. A spring 112 is mounted on the cylinder between one end of the body 113 and one side of the adjacent upper clamping plate 113, the upper end of the spring 112 is fixedly connected to the stepped surface of the chuck 111, and the lower end of the spring 11 is fixedly connected to the outer side surface of the upper clamping plate 113, so that the chuck 111 is elastically vertically arranged in the through hole and moves up and down along the through hole. An electromagnet 115 is provided on the lower side surface of the lower clamping plate 114 to cooperate with the chuck 111. After the electromagnet is energized, the chuck is sucked in once to pass through the through hole and the hinge seat 116 to ream a hole, so that the drawing vehicle 31 is rigidly connected to the second mold core 5. A countersunk hole can also be provided on the lower clamping plate 114, so that the chuck 111 passes through the through hole and the hinge seat to the countersunk hole in sequence, so that the connection is more stable.

[0028] like Figure 3 As shown, in order to control the movement distance of the second drawing die seat 52 corresponding to the second mold core 5 so that there is an appropriate distance between the first mold core 5 and the second mold core 7, further, a pair of positioning telescopic blocks 91 are provided on the guide rail 2, and each guide rail 2 is provided with a guide hole 9 vertically penetrating the guide rail. The positioning telescopic block 91 reciprocates vertically up and down in the guide hole 9 of the guide rail 2 under the drive of the first cylinder 92. A first position sensor 8 is provided on the frame 1 of the drawing mechanism 3 on one side corresponding to the positioning telescopic block 91. The first position sensor 8 is electrically connected to the controller, and the controller is electrically connected to the solenoid valve on the first cylinder 92 through a wire, and the extension and retraction of the first cylinder 92 is controlled by the solenoid valve. The controller is electrically connected to the relay on the electromagnet 115 through a wire, and the power on or off of the electromagnet 115 is controlled by the relay.

[0029] like Figure 5As shown, in order to position the second drawing die seat 52 corresponding to the second die core 5, further, the two sides of the frame 1 of the plate pulling mechanism 3 corresponding to the positioning telescopic block 91 are respectively provided with clamping devices 10, and the clamping device 10 on each side includes a double-headed fork 101, the middle part of the double-headed fork 101 is hinged on the frame 1, the lower end of the double-headed fork 101 is hinged to the piston rod end of the second cylinder 102, the base of the second cylinder 102 is hinged on the frame 1, and the second cylinder 102 is hinged on the frame 1. The cylinder rotates through the double-headed fork 101 and then the hinged shaft hinged on the frame, so that each double-headed fork 101 is clamped on the corresponding side of the second mold core 5 from the side of the frame, thereby clamping the second mold core 5, and cooperating with the positioning telescopic block 91 to limit the second mold core 5, so that during the drawing process, the second mold core 5 can stay stably on the guide rail 2, and the controller is electrically connected to the solenoid valve on the second cylinder 102 through a wire, and the extension and retraction of the second cylinder 102 is controlled by the solenoid valve.

[0030] like Figure 1 As shown, a continuous drawing method for a bar material comprises the following steps: S1: placing a rolled bar material 4 on a turntable, and then manually rolling one end of the rolled bar material 4 into a shape through one side of a first die core 7 of the continuous drawing device for a bar material through a first drawing hole 71, a guide cavity 61, and a second drawing hole 51 in sequence, and then clamping the end portion through an automatic clamp 32 of a drawing vehicle 31;

[0031] S2: The drawing vehicle 31 moves from the initial position to the end position along the guide rail 2, and draws the bar 4 through the first mold core 7 and the second mold core 5 twice in succession. After the drawing vehicle 31 reaches the end position, the automatic clamp 32 is released, and then returns to the initial position along the guide rail 2 and automatically clamps the bar 4, and then moves from the initial position to the end position, and draws the bar 4 through the first mold core 7 and the second mold core 5 twice in succession.

[0032] S3: Repeat step S2 until a roll of rod 4 on the disc machine is drawn and formed.

[0033] In order to increase the interval time between the first drawing and the second drawing, the distance between the first core 7 and the second core 5 can be adjusted, and the surface strength is optimized by cooling the first drawing and then drawing the second time.

[0034] like Figure 3 As shown, in step S1: the rolled bar 4 is mounted on an inverted wire drawing machine for coiling and uncoiling, and then one end is manually rolled into shape and passes through the first drawing hole 71, the guide cavity 61, and the second drawing hole 51 in sequence from one side of the first die core 7, and then the end is clamped by the automatic clamp 32 of the drawing car 31, and the drawing car 31 is fixedly connected to the second drawing die seat 52 corresponding to the second die core 5 by the electromagnetic locking mechanism 111;

[0035] In step S2: the drawing vehicle 31 is started by the controller, and the drawing vehicle 31 drives the second drawing die seat 52 corresponding to the second mold core 5 to draw the rod 4 along the guide rail 2 to the end position. The rod 4 is drawn once through the first mold core 7. When the drawing vehicle 31 travels to the position of the first position sensor 8, the first position sensor 8 feeds back the position signal to the controller, and the controller controls the electromagnetic locking mechanism 10 through the relay to disconnect the connection between the drawing vehicle 31 and the second drawing die seat 52 corresponding to the second mold core 5, and at the same time controls the action of the first cylinder 92 through the electromagnetic valve. The positioning telescopic block 91 is driven by the first cylinder 92 to extend from the bottom of the guide hole 9 on the guide rail 2 to the upper end of the guide rail 2 to block the second drawing die seat 52 corresponding to the second mold core 5. The second cylinder 102 is controlled to move by the electromagnetic valve, and the double-headed fork 101 is driven by the second cylinder 102 to clamp the second mold core 5 on both sides of the second drawing die seat 52 corresponding to the second mold core 5, and then the drawing vehicle 31 continues to draw the rod 4 to the end position, and the rod 4 passes through the second drawing hole 51 of the second mold core 5 for secondary drawing of the rod 4, and the rod 4 is drawn and formed twice through the first mold core 7 and the second mold core 5; after the drawing vehicle 31 reaches the end position, the automatic clamp 32 is released, and then returns to the position of the first position sensor 8 along the guide rail 2 and then automatically clamps the rod 4, and then draws to the end position, and the rod 4 is drawn and formed twice through the first mold core 7 and the second mold core 5;

[0036] In step S3: after the drawing vehicle 31 in step S2 reaches the end position, the automatic clamp is released, and then returns to the position of the first position sensor 8 along the guide rail 2 and then automatically clamps the rod 4, and then draws it to the end position, and the rod 4 is drawn and formed twice through the first mold core 7 and the second mold core 5, until a roll of rod 4 on the disc machine is drawn and formed, and by adjusting the distance between the first mold core 7 and the second mold core 5, the rod 4 is naturally cooled after being drawn through the first mold core 7 to strengthen the surface, and then drawn and formed through the second mold core 5, the surface reduction rate can be increased, the strength can be improved, and the surface quality can be improved at the same time.

[0037] In order to improve the surface strength of the rod 4 after drawing, further, in step S2: air cooling is performed between the second drawing and the first drawing, and the surface strengthening effect of the rod 4 after the first drawing is controlled by air cooling.

[0038] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A continuous drawing device for a bar, comprising a frame, a guide rail is provided on the frame, a drawing mechanism is provided on the guide rail, the drawing mechanism comprises a drawing vehicle reciprocating on the guide rail, an automatic clamp is provided on one side of the drawing vehicle, and a drawing die seat is provided on the side of the frame close to the automatic clamp, characterized in that: The drawing die seat is provided with a guide cavity penetrating the die seat, the drawing die seat is provided with a first die core corresponding to the inlet end of the guide cavity, the first die core is provided with a first drawing hole penetrating the die core and communicating with the inlet end of the guide cavity, the drawing die seat is provided with a second die core corresponding to the outlet end of the guide cavity, the second die core is provided with a second drawing hole penetrating the die core and communicating with the outlet end of the guide cavity, and the aperture of the first drawing hole is larger than the aperture of the second drawing hole; The second mold core and the corresponding second drawing die seat are separated from the first mold core and the corresponding drawing die seat, and the second mold core and the corresponding second drawing die seat are slidably arranged on the guide rail; A hinge seat is provided on the side of the second drawing die seat corresponding to the second mold core close to the drawing vehicle, and an electromagnetic locking mechanism is provided on the side corresponding to the drawing vehicle. The electromagnetic locking mechanism includes a pair of upper clamping plates and a lower clamping plate. The hinge seat can be inserted between the upper clamping plate and the lower clamping plate. The upper clamping plate is provided with a through hole corresponding to the hinge seat hole. A chuck is provided in the through hole. The chuck is a stepped cylinder. A spring is mounted on the cylinder between the end of the chuck away from the upper clamping body and the side of the upper clamping plate adjacent thereto. An electromagnet is provided on the lower side surface of the lower clamping plate to cooperate with the chuck.

2. A rod continuous drawing device according to claim 1, characterized in that: A pair of positioning telescopic blocks are provided on the guide rail. The positioning telescopic blocks move vertically up and down in the guide hole of the guide rail under the drive of the first cylinder. A first position sensor is provided on the frame of the pulling mechanism on one side corresponding to the positioning telescopic blocks. The first position sensor is electrically connected to the controller. The controller is electrically connected to the solenoid valve on the first cylinder through a wire, and the controller is electrically connected to the relay on the electromagnet through a wire.

3. A rod continuous drawing device as claimed in claim 2, characterized in that: Clamping devices are respectively provided on both sides of the pulling mechanism frame corresponding to the positioning telescopic block, and the clamping device on each side includes a double-headed fork, the middle part of the double-headed fork is hinged to the frame, the lower end of the double-headed fork is hinged to the end of the piston rod of the second cylinder, and the base of the second cylinder is hinged to the frame.

4. A continuous rod drawing method of a continuous rod drawing device according to claim 3, characterized in that: The following steps are involved: S1: The rolled bar is placed on a turntable, and one end is manually rolled into shape, and passes through the first drawing hole, the guide cavity, and the second drawing hole in sequence from one side of the first die core, and then the end is clamped by the automatic clamp of the drawing car; S2: The drawing car moves from the initial position to the end position along the guide rail, and draws the bar through the first mold core and the second mold core twice in succession. After the drawing car reaches the end position, the automatic clamp is released, and then the drawing car returns to the initial position along the guide rail and then automatically clamps the bar, and then moves from the initial position to the end position, and draws the bar through the first mold core and the second mold core twice in succession; S3: Repeat step S2 until a roll of rod on the disc machine is drawn and formed.

5. A continuous drawing method for a rod as claimed in claim 4, characterized in that: In step S1: the rolled bar is placed on a turntable, and one end is manually rolled into shape, and passes through the first drawing hole, the guide cavity, and the second drawing hole in sequence from one side of the first die core, and then the end is clamped by the automatic clamp of the drawing car, and the drawing car is fixedly connected to the second drawing die seat corresponding to the second die core by the electromagnetic locking mechanism; In step S2: the drawing vehicle is started by the controller, and the drawing vehicle drives the second drawing die seat corresponding to the second die core to draw the rod along the guide rail to the end position, and the rod passes through the first die core for one drawing, and when the drawing vehicle travels to the position of the first position sensor, the first position sensor feeds back the position signal to the controller, and the controller controls the electromagnetic locking mechanism through the relay to disconnect the connection between the drawing vehicle and the second drawing die seat, and at the same time controls the action of the first cylinder through the electromagnetic valve, and the positioning telescopic block is driven by the first cylinder to extend from the bottom of the guide hole on the guide rail to the upper end surface of the guide rail to block the second drawing die seat. The drafting seat controls the action of the second cylinder through the electromagnetic valve, and the double-headed fork clamps the second drafting die seat from both sides of the second drafting die seat under the drive of the second cylinder, and then the drawing car continues to draw the bar to the end position, and the bar passes through the second die core for secondary drawing of the bar, and the bar is drawn through the first die core and then cooled, and then drawn and formed twice continuously through the second die core; after the drawing car reaches the end position, the automatic clamp is released, and then returns to the position of the first position sensor along the guide rail and then automatically clamps the bar, and then draws to the end position, and the bar is drawn and formed twice continuously through the first die core and the second die core; In step S3: after the drawing vehicle in step S2 reaches the end position, the automatic clamp is released, and then returns to the position of the first position sensor along the guide rail and then automatically clamps the bar, and then draws it to the end position, and the bar is drawn and formed twice continuously through the first mold core and the second mold core until a roll of bars on the disc machine is drawn and formed.

6. A method for continuous drawing of a rod as claimed in claim 5, characterized in that: In step S2: cooling is performed by air cooling between the second drawing and the first drawing.

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