Heading device of forward double-acting extruding machine and forward double-acting extruding machine

Abstract

The utility model relates to the technical field of metal extrusion, and discloses a heading device of a forward double-acting extruder and the forward double-acting extruder. The upsetting device comprises a machine frame, a rear beam, an ingot containing barrel and a front beam, wherein the rear beam, the ingot containing barrel and the front beam are sequentially arranged on the machine frame; the ingot containing barrel is slidably connected to the rack, a first opening is formed in the end, close to the rear beam, of the ingot containing barrel, a second opening is formed in the end, close to the front beam, of the ingot containing barrel, and the first opening and the second opening communicate with the interior of the ingot containing barrel; the side, close to the ingot containing barrel, of the rear beam is movably connected with an extrusion rod, the side, close to the ingot containing barrel, of the front beam is provided with an upsetting rod, during upsetting, at least part of the upsetting rod penetrates through the second opening to enter the ingot containing barrel, at least part of the extrusion rod penetrates through the first opening to enter the ingot containing barrel, the extrusion rod extrudes metal materials in the ingot containing barrel, and after upsetting, the metal materials in the ingot containing barrel are extruded by the extrusion rod. And a perforation avoiding space is formed between the metal material and the second opening. The method has the beneficial effects of improving the utilization rate of metal materials and reducing the production cost.

Description

Technical Field

[0001] The utility model relates to the technical field of metal extrusion, and particularly relates to a upsetting device for a forward double-action extruder and a forward double-action extruder. Background Art

[0002] Producing metal pipes by using a metal extruder is a relatively common method in the current pipe manufacturing field. Generally speaking, when using a metal extruder to produce pipes, it is necessary to first upset and pierce the metal material, and then extrude the metal material. After upsetting, the die is aligned with the opening of the ingot container, and then piercing is carried out. However, referring to Figure 13 , after piercing, there will be more metal materials located in front of the piercing needle and inside the die. When extruding to produce pipes, these metal materials will form solid rods instead of forming the pipes as the production target. Therefore, this part of the metal materials will become waste materials, which is not conducive to improving the utilization rate of the metal materials.

[0003] Later, a forward double-action extruder appeared. During upsetting, one side opening of the ingot container is blocked by a plug plate. The extrusion rod drives the extrusion head to upset the metal material in the ingot container and squeeze the metal material to the plug plate. The plug plate can prevent the metal material from flowing out of the ingot container. During piercing, the extrusion rod and the extrusion head move backward, pulling away from the upset metal material to create a certain space. Finally, piercing is carried out, so that the metal material extruded during piercing can move backward into the above-mentioned created space, avoiding the metal material extruded during piercing from entering the die and becoming waste materials, thereby improving the utilization rate of the metal materials.

[0004] However, in the actual structure of the forward double-action extruder, in order to prevent the metal material from flowing backward through the gap between the extrusion head and the inner wall of the ingot container during extrusion, there is a strict structural cooperation between the extrusion head and the inner wall of the ingot container, and it is extremely difficult for the extrusion head to retreat in the ingot container. Therefore, it is extremely difficult to achieve in actual operation to make the extrusion head retreat in the ingot container after upsetting to create a certain space. Secondly, this method requires an increase in the piercing force, which is likely to cause the piercing needle to bend and deform, resulting in the eccentricity of the extruded pipes exceeding the standard requirements.

[0005] In summary, those skilled in the art need a forward double-action extruder that is different from the above-mentioned prior art and can avoid forming waste materials during piercing to improve the utilization rate of metal materials. Summary of the Utility Model

[0006] The main purpose of the utility model is to propose an upsetting device for a forward double-action extruder, aiming to solve the technical problem that the metal material for piercing easily enters the die and becomes waste materials in the prior art.

[0007] To achieve the above-mentioned purpose, the utility model proposes a roughening device for a forward double-acting extruder, comprising a frame and a rear beam, an ingot barrel and a front beam arranged in sequence thereon; the ingot barrel is slidably connected to the frame, and a first opening is provided at one end of the ingot barrel close to the rear beam, and a second opening is provided at one end of the ingot barrel close to the front beam, and the first opening and the second opening are both connected to the interior of the ingot barrel; an extrusion rod is movably connected to the side of the rear beam close to the ingot barrel, and a roughening rod is provided at the side of the front beam close to the ingot barrel. During roughing, at least part of the roughing rod passes through the second opening into the ingot barrel, and at least part of the extrusion rod passes through the first opening into the ingot barrel. The extrusion rod squeezes the metal material in the ingot barrel, so that after roughing, a perforated avoidance space is formed between the metal material and the second opening.

[0008] The beneficial effects of the present invention are as follows: before punching, the ingot holding barrel is moved, at least part of the punching rod is placed inside the ingot holding barrel, and then the extrusion rod is used for punching, so that the internal space of the ingot holding barrel between the extrusion rod and the punching rod is filled with metal material. Before piercing, the ingot holding barrel is moved so that the punching rod is separated from the ingot holding barrel, thereby forming a punching avoidance space between the metal material and the second opening. The metal material extruded during piercing enters the punching avoidance space and does not enter the mold, thereby preventing waste from forming. This is beneficial for improving the utilization rate of the metal material and reducing production costs.

[0009] Preferably, the length H1 of the roughing rod is smaller than the length H2 of the ingot holding barrel, which is beneficial to ensuring the structural stability of the roughing rod and preventing it from shifting or deforming, thereby ensuring the roughing quality and smooth roughing process.

[0010] Preferably, an end of the extrusion rod away from the rear beam is detachably connected to an extrusion head. During upsetting, the extrusion head is located in the ingot holding barrel and extrudes the metal material.

[0011] Preferably, an extrusion drive device is provided on the rear beam, and the extrusion rod is in transmission connection with the extrusion drive device, and the extrusion drive device is used to drive the extrusion rod to move axially so that at least part of the extrusion rod can enter the ingot holding barrel.

[0012] The utility model also provides a forward double-action extruder, comprising the upsetting device of the forward double-action extruder.

[0013] Preferably, a switching device is provided on the front beam. The switching device includes a switching seat slidably connected to the side of the front beam near the ingot barrel and a switching drive device drivingly connected to the switching seat. The switching seat near the ingot barrel is provided with a roughing rod and a mold. The switching drive device can drive the switching seat to move so that the roughing rod or the mold is aligned with the second opening. The provision of the switching device facilitates switching the positions of the roughing rod and the mold, thereby improving production efficiency.

[0014] Preferably, the front beam is further provided with a metal profile discharge channel running through the front beam, and when the mold faces the second opening, the metal profile discharge channel faces the mold.

[0015] Preferably, the forward double-acting extruder further includes a piercing device, which includes a piercing driving device and a piercing needle connected in transmission. The piercing needle is arranged inside the extrusion rod. During piercing, the piercing driving device drives the piercing needle to extend out of the extrusion rod and pass through the main body part of the metal material. The metal material extruded during piercing enters the piercing avoidance space. After upsetting, a piercing avoidance space with sufficient length is formed in the ingot container. During piercing, the front end of the piercing needle will extend into the piercing avoidance space, and the metal material extruded during piercing will also enter the piercing avoidance space and will not enter the mold, thus avoiding the formation of waste, and leaving sufficient space for the piercing needle, which can prevent the piercing needle from colliding with other components and being damaged. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the structures shown in these drawings.

[0017] Figure 1 It is a schematic structural diagram of the frame, rear beam, ingot container and front beam in the forward double-acting extruder in the embodiment of the present invention;

[0018] Figure 2 It is a schematic structural diagram of the ingot container and the upsetting rod in the embodiment of the present invention;

[0019] Figure 3 It is a schematic structural diagram of the forward double-acting extruder when feeding the rod in the embodiment of the present invention;

[0020] Figure 4 It is a schematic structural diagram of the forward double-acting extruder during upsetting in the embodiment of the present invention, at this time the extrusion rod advances;

[0021] Figure 5 It is a schematic structural diagram of the forward double-acting extruder after upsetting in the embodiment of the present invention, at this time the extrusion rod and the ingot container retreat synchronously;

[0022] Figure 6 It is a schematic structural diagram of the forward double-acting extruder before piercing in the embodiment of the present invention, at this time the mold is switched to face the second opening of the ingot container;

[0023] Figure 7 It is a schematic structural diagram of the forward double-acting extruder before piercing in the embodiment of the present invention, at this time the ingot container and the extrusion rod advance synchronously until the metal material abuts against the upsetting rod;

[0024] Figure 8In the embodiment of the present utility model, it is a schematic structural diagram when the piercing needle advances during the piercing process of the forward double-acting extruder;

[0025] Figure 9 In the embodiment of the present utility model, it is a schematic structural diagram after the piercing of the forward double-acting extruder;

[0026] Figure 10 In the embodiment of the present utility model, it is a schematic structural diagram before the upper rod of the forward double-acting extruder. At this time, the metal material is clamped between the extrusion rod and the upsetting rod;

[0027] Figure 11 In the embodiment of the present utility model, it is a schematic structural diagram after the upper rod of the forward double-acting extruder;

[0028] Figure 12 In the embodiment of the present utility model, it is a schematic structural diagram of the forward double-acting extruder when the extrusion head is installed on the extrusion rod after using the upper rod method 2 for the upper rod;

[0029] Figure 13 It is a schematic diagram of the state after the piercing needle pierces in the prior art.

[0030] In the drawings: 1-frame, 2-rear beam, 21-extrusion rod, 211-extrusion head, 22-extrusion drive device, 221-main oil cylinder, 222-plunger, 223-moving beam, 23-piercing device, 231-piercing drive device, 232-piercing needle, 3-ingot container, 31-first opening, 32-second opening, 33-piercing avoidance space, 4-front beam, 41-switching seat, 411-upsetting rod, 412-die, 42-metal profile discharge channel, 10-metal material.

[0031] The realization, functional features and advantages of the object of the present utility model will be further described with reference to the embodiments and the accompanying drawings. Specific embodiments

[0032] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present utility model.

[0033] It should be noted that if there are directional indications involved in the embodiments of the present utility model, such as up, down, left, right, front, back, etc., then the directional indications are only used to explain the relative positional relationship and movement conditions between components in a certain specific posture. If this specific posture changes, then the directional indications will also change accordingly.

[0034] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present utility model, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0035] As Figures 1 to 12 shown, a upsetting device of a forward double-acting extruding machine includes a frame 1, a rear beam 2, a billet container 3, and a front beam 4 arranged in sequence thereon; the billet container 3 is slidably connected to the frame 1. One end of the billet container 3 close to the rear beam 2 is provided with a first opening 31, and one end of the billet container 3 close to the front beam 4 is provided with a second opening 32. Both the first opening 31 and the second opening 32 communicate with the inside of the billet container 3; one side of the rear beam 2 close to the billet container 3 is movably connected with an extrusion rod 21, and one side of the front beam 4 close to the billet container 3 is provided with an upsetting rod 411. During upsetting, at least part of the upsetting rod 411 passes through the second opening 32 and enters the billet container 3, and at least part of the extrusion rod 21 passes through the first opening 31 and enters the billet container 3. The extrusion rod 21 extrudes the metal material 10 in the billet container 3, so that after upsetting, a piercing avoidance space 33 is formed between the metal material 10 and the second opening 32.

[0036] Before upsetting, move the billet container 3 to sleave at least part of the upsetting rod 411 in the billet container 3, and then use the extrusion rod 21 for upsetting to fill the internal space of the billet container 3 between the extrusion rod 21 and the upsetting rod 411 with the metal material 10. Before piercing, move the billet container 3 to separate the upsetting rod 411 from the billet container 3, and a piercing avoidance space 33 will be formed between the metal material 10 and the second opening 32, so that the metal material 10 extruded during piercing enters the piercing avoidance space 33 and will not enter the die 412, thus preventing the formation of waste, which is beneficial to improving the utilization rate of the metal material 10 and reducing production costs.

[0037] Specifically, a slide rail is provided on the frame 1, and the slide rail extends along the arrangement direction of the rear beam 2, the billet container 3, and the front beam 4. The billet container 3 is arranged on the slide rail and can move along the slide rail.

[0038] In some specific embodiments, referring to Figure 2 , the length H1 of the upsetting rod 411 is less than the length H2 of the billet container 3, which is beneficial to ensuring the structural stability of the upsetting rod 411, making it not easy to shift or deform, beneficial to ensuring the upsetting quality, and ensuring the smooth progress of the upsetting process.

[0039] In a forward double-acting extruder, since the upsetting rod 411 does not need to pass through the first opening 31 after passing through the second opening 32 during extrusion production, the length H1 of the upsetting rod 411 does not necessarily have to be longer than the length H2 of the ingot container 3. However, since the extrusion rod 21 of the forward double-acting extruder is provided on the rear beam 2 and the extrusion rod 21 is relatively long, and the space between the front beam 4 and the rear beam 2 is limited, based on the requirements of the spatial layout, the length of the upsetting rod 411 cannot be too long. Therefore, the length H1 of the upsetting rod 411 is less than the length H2 of the ingot container 3. By setting the length H1 of the upsetting rod 411 to be less than the length H2 of the ingot container 3, the upsetting rod 411 is not prone to tilt, deformation or displacement, and the process of the ingot container 3 sleeving the upsetting rod 411 therein will be relatively smooth, thereby improving production efficiency.

[0040] The upsetting device of this embodiment has two ways of loading the rod:

[0041] 1. Refer to Figure 3 and Figure 4 , move the metal material 10 between the extrusion rod 21 and the first opening 31, move the extrusion rod 21, and the extrusion rod 21 will push the metal material 10 into the ingot container 3 from the first opening 31;

[0042] 2. Refer to Figure 10 and Figure 11 , the ingot container 3 is sleeved on the extrusion rod 21, and one end of the extrusion rod 21 far from the rear beam 2 passes through the first opening 31 and the second opening 32 to the side of the ingot container 3 close to the front beam 4. Move the metal material 10 between the upsetting rod 411 and the extrusion rod 21, the upsetting rod 411 and the extrusion rod 21 clamp the metal material 10, and then move the ingot container 3 until the metal material 10 reaches the corresponding position inside the ingot container 3.

[0043] In some specific embodiments, refer to Figure 1 , Figures 3 to 12 , one end of the extrusion rod 21 far from the rear beam 2 is detachably connected with an extrusion head 211. During upsetting, the extrusion head 211 is located inside the ingot container 3 and extrudes the metal material 10.

[0044] Specifically, before extruding the metal material 10, an extrusion head 211 needs to be installed at one end of the extrusion rod 21 far from the rear beam 2. There is a precise structural cooperation between the extrusion head 211 and the inner wall of the ingot container 3, which can prevent the metal material 10 from flowing backward through the gap between the extrusion head 211 and the inner wall of the ingot container 3 during upsetting and extrusion forming, ensuring the utilization rate of the metal material 10. Due to the structural cooperation between the extrusion head 211 and the inner wall of the ingot container 3, the extrusion head 211 can move forward inside the ingot container 3, but it is very difficult to move backward inside the ingot container 3.

[0045] Before the metal material 10 is extruded and formed, an extrusion head 211 needs to be installed at one end of the extrusion rod 21 away from the rear beam 2. Subsequently, the extrusion rod 21 drives the extrusion head 211 into the ingot container 3 to extrude the metal material 10.

[0046] After the extrusion forming process is completed, the extrusion head 211 will extend out from the second opening 32, and then be knocked off by the shearing machine, so that the extrusion rod 21 can retract backward.

[0047] When loading the upper rod, the extrusion head 211 does not need to be installed on the extrusion rod 21, otherwise the extrusion head 211 cannot withdraw from the ingot container 3.

[0048] In some specific embodiments, referring to Figure 1 , an extrusion driving device 22 is provided on the rear beam 2. The extrusion rod 21 is in transmission connection with the extrusion driving device 22. The extrusion driving device 22 is used to drive the extrusion rod 21 to axially move, so that at least part of the extrusion rod 21 can enter the ingot container 3.

[0049] Specifically, the extrusion driving device 22 includes a main oil cylinder 221 and a moving beam 223. The moving beam 223 is arranged on the plunger 222 of the main oil cylinder 221, and the extrusion rod 21 is arranged on the moving beam 223. When the main oil cylinder 221 is started, it can drive the extrusion rod 21 to extend into the ingot container 3 through the plunger 222 and the moving beam 223.

[0050] In some other embodiments, other forms of driving devices can also be used, as long as they can drive the extrusion rod 21 to axially move and extend into the ingot container 3.

[0051] This embodiment also proposes a forward double-action extruding machine, including the upsetting device of the above-mentioned forward double-action extruding machine.

[0052] In some specific embodiments, referring to Figure 1 , a switching device is provided on the front beam 4. The switching device includes a switching seat 41 slidably connected to the side of the front beam 4 close to the ingot container 3 and a switching driving device in transmission connection with the switching seat 41. A upsetting rod 411 and a die 412 are provided on the side of the switching seat 41 close to the ingot container 3. The switching driving device can drive the switching seat 41 to move, so that the upsetting rod 411 or the die 412 is aligned with the second opening 32. The setting of the switching device makes it convenient to switch the positions of the upsetting rod 411 and the die 412, which is beneficial to improving the production efficiency.

[0053] Specifically, a slide groove is provided on the side of the front beam 4 close to the ingot barrel 3, and the slide groove extends in the horizontal direction and is perpendicular to the arrangement direction of the rear beam 2, the ingot barrel 3 and the front beam 4. The switching seat 41 is clamped in the slide groove and can slide along the slide groove. A roughening rod 411 and a mold 412 are provided on the side of the switching seat 41 close to the ingot barrel 3, and the roughening rod 411 and the mold 412 are arranged along the direction of the slide groove. When roughening is required, the switching drive device drives the switching seat 41 to slide along the slide groove so that the roughening rod 411 faces the second opening 32; when perforation or extrusion molding is required, the switching drive device drives the switching seat 41 to move along the slide groove so that the mold 412 faces the second opening 32.

[0054] The switching driving device is an oil cylinder, and may also be an air cylinder or other forms of driving devices, as long as it can make the pier rod 411 or the mold 412 face the second opening 32 .

[0055] In some specific embodiments, reference Figures 6 to 9 The front beam 4 is also provided with a metal profile discharge channel 42 running through it. When the mold 412 faces the second opening 32 , the metal profile discharge channel 42 faces the mold 412 .

[0056] When the switching seat 41 drives the mold 412 to move to face the second opening 32 , the mold 412 faces and communicates with the metal profile discharge channel 42 , and the metal profile extruded from the mold 412 extends out of the front beam 4 through the metal profile discharge channel 42 .

[0057] In some specific embodiments, reference Figure 1 , Figures 3 to 12 The forward double-acting extruder also includes a punching device 23, which includes a punching drive device 231 and a punching needle 232 that are transmission-connected. The punching needle 232 is arranged in the extrusion rod 21. During punching, the punching drive device 231 drives the punching needle 232 to extend out of the extrusion rod 21 and penetrate the main part of the metal material 10. The metal material 10 extruded during punching enters the punching avoidance space 33. After roughing, a punching avoidance space 33 of sufficient length is formed in the ingot barrel 3. During punching, the front end of the punching needle 232 will extend into the punching avoidance space 33. The metal material 10 extruded during punching will also enter the punching avoidance space 33 and will not enter the mold 412, thereby avoiding the formation of waste. In addition, sufficient space is reserved for the punching needle 232 to prevent the punching needle 232 from colliding with other components and being damaged.

[0058] Specifically, the piercing driving device 231 is an oil cylinder, which is referred to as a piercing cylinder in this embodiment. The piercing needle 232 is fixed on the piston rod of the piercing cylinder. During piercing, the extrusion head 211 still abuts against the metal material 10. The piercing cylinder drives the piercing needle 232 to move forward and extend out of the extrusion head 211 until one end of the piercing needle 232 away from the rear beam 2 pierces the main body part of the metal material 10, and the metal material 10 extruded by the piercing needle 232 enters the piercing avoidance space 33 and does not enter the die 412. It can still be used as an effective metal material 10 for the extrusion production of metal profiles, thereby improving the utilization rate of the metal material 10 and improving production efficiency.

[0059] Reference Figure 9 , the main body part of the metal material 10 refers to most of the metal material that is not moved and extruded by the piercing needle 232 during the piercing process ( Figure 9 as indicated by a). The metal material 10 before piercing is equal to the sum of the main body part of the metal material after piercing ( Figure 9 as indicated by a) and the metal material extruded during piercing ( Figure 9 as indicated by b).

[0060] Figures 3 to 9 This is a schematic diagram of the upsetting and piercing processes of a forward double-acting extruding machine in the embodiment of the present invention. Among them, the first rod feeding method is adopted when feeding the rod.

[0061] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention. Any equivalent structural transformation made under the inventive concept of the present invention by using the content of the specification and drawings of the present invention, or any direct / indirect application in other related technical fields is included in the patent protection scope of the present invention.

Claims

1. A upsetting device for a forward double-acting extruding machine, characterized in that: It includes a frame (1), a rear beam (2), an ingot container (3), and a front beam (4) arranged in sequence thereon. The ingot container (3) is slidably connected to the frame (1). A first opening (31) is provided at one end of the ingot container (3) close to the rear beam (2), and a second opening (32) is provided at one end of the ingot container (3) close to the front beam (4). Both the first opening (31) and the second opening (32) communicate with the interior of the ingot container (3). A squeezing rod (21) is movably connected to one side of the rear beam (2) close to the ingot container (3). A upsetting rod (411) is provided on one side of the front beam (4) close to the ingot container (3). During upsetting, at least part of the upsetting rod (411) passes through the second opening (32) and enters the ingot container (3), and at least part of the squeezing rod (21) passes through the first opening (31) and enters the ingot container (3). The squeezing rod (21) squeezes the metal material (10) in the ingot container (3), so that after upsetting, a piercing avoidance space (33) is formed between the metal material (10) and the second opening (32).

2. The upsetting device of the forward double-acting extruding press according to claim 1, characterized in that: The length H1 of the upsetting rod (411) is less than the length H2 of the ingot container (3).

3. The upsetting device of the forward double-acting extruding machine according to claim 1, characterized in that: One end of the squeezing rod (21) far from the rear beam (2) is detachably connected with a squeezing head (211). During upsetting, the squeezing head (211) is located in the ingot container (3) and squeezes the metal material (10).

4. The upsetting device of the forward double-acting extruding machine according to claim 1, characterized in that: A squeezing driving device (22) is provided on the rear beam (2). The squeezing rod (21) is in transmission connection with the squeezing driving device (22). The squeezing driving device (22) is used to drive the squeezing rod (21) to axially move, so that at least part of the squeezing rod (21) can enter the ingot container (3).

5. A forward double-action extruding machine, characterized in that: It includes the upsetting device of the forward double-acting extruding machine according to any one of claims 1 to 4.

6. The forward double-acting extruder according to claim 5, wherein: A switching device is provided on the front beam (4). The switching device includes a switching seat (41) slidably connected to one side of the front beam (4) close to the ingot container (3) and a switching driving device in transmission connection with the switching seat (41). The upsetting rod (411) and a die (412) are provided on one side of the switching seat (41) close to the ingot container (3). The switching driving device can drive the switching seat (41) to move, so that the upsetting rod (411) or the die (412) faces the second opening (32).

7. The forward double-acting extruder according to claim 6, wherein: A metal profile discharging channel (42) penetrating through the front beam (4) itself is further provided on the front beam (4). When the die (412) faces the second opening (32), the metal profile discharging channel (42) faces the die (412).

8. The forward double-acting extruder according to claim 5, characterized in that: It further includes a perforating device (23), and the perforating device (23) includes a perforating driving device (231) and a perforating needle (232) which are in transmission connection. The perforating needle (232) is arranged in the extrusion rod (21). During perforation, the perforating driving device (231) drives the perforating needle (232) to extend out of the extrusion rod (21) and penetrate through the main body part of the metal material (10). The metal material (10) extruded during perforation enters the perforating avoidance space (33).

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