Automobile rotary extrusion die core and working method thereof

Abstract

The application discloses a kind of automobile rotation extrusion mould core and its working method, it is related to extrusion die technical field, including lower mould shell, upper die head of bolted installation in lower mould shell upper end opening position, flange bolted installation of disc type feed head in upper die head top end, and the layer type filter material flow guide structure of upper die head inside installation below disc type feed head, the upper end surface of the material collection type die rod core is screw-threaded in the opening position at the bottom of upper die head and is mutually contacted with the lower end surface of layer type filter material flow guide structure.The application installs layer type filter material flow guide structure from lower end into upper die head, cooperates the reasonable layout of disc type feed head and material collection type die rod core, forms a compact structure, convenient to disassemble and assemble, smooth, maintenance convenient extrusion mould core, not only improves the operating efficiency and maintenance convenience of mould, but also improves the flow quality of aluminum material, ensures the high quality of round tube product and the continuity of production.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of extrusion dies, in particular to an automobile rotary body extrusion die core and a working method thereof. BACKGROUND

[0002] The die core of an automobile aluminum round pipe extrusion die is a core component for forming the inner hole of a pipe, and its essence is an elongated shaft structure made of high-strength heat-resistant and wear-resistant die steel (such as H13 steel) and subjected to precision machining and heat treatment. The die core structure mainly comprises three key parts: a tapered lead-in section is designed at the front end; the middle part is a precision-ground and size-accurate cylindrical working zone (sizing zone); and the rear end is a connecting section which is firmly fixed on the die rear support through threads, conical surfaces or locking nuts, etc., to ensure that the die core maintains absolute position stability and centering accuracy under the huge extrusion force. In the extrusion process, the aluminum ingot heated to plasticity is pushed to flow in the extrusion cylinder by strong pressure, and the die core and the outer die hole jointly form a precise annular gap channel. After the aluminum metal passes through the shunt-welding process of the shunt die or the direct penetration process of the perforating needle system, it is forced to flow through the annular gap. When the metal flows through the working zone of the die core, it is subjected to strong friction constraint and ironing on the surface of the working zone, and the inner hole shape is accurately shaped and sized, and finally extruded into a round pipe of the required specification;

[0003] As disclosed in the authorized announcement No. CN210121618U, a kind of automobile industry round pipe profile extrusion die, including upper die core, middle die core, shunt hole and drainage groove, the upper die core is equipped with middle die core above, the middle die core is equipped with welding chamber and pressure relief bridge above, the top of the middle die core is evenly distributed with die hole, the right side of the die hole is equipped with positioning pin, the outside of the upper die core is evenly distributed with bridge position, the side of the bridge position is equipped with lower knife, the surface of the upper die core is equipped with feed hole, the outside of the middle die core is evenly distributed with lower die cavity, which is by being equipped with four shunt holes on the upper die, then after the middle die, it is divided into eight to twelve shunt holes, finally extruded out of material through the lower die, however, the middle die core in the above technical scheme needs to be closely matched in the upper die core, when replacing, the upper die core or the large assembly associated therewith needs to be completely disassembled first, so that the internal middle die core can be accessed, and the operation process needs to repeatedly lift the heavy die components, which not only consumes time and effort, but also has the risk of collision and damage to the precision matching surface during the movement of the heavy components. SUMMARY

[0004] The automobile rotary extrusion die core and the working method thereof are characterized by the following technical solutions: a layer filter guide structure is installed at the lower end of an upper die head, a disc type feeding head is fixed at the upper end opening of the upper die head, and a material collecting type die rod core is threadedly installed at the lower end of the upper die head until the material collecting type die rod core is in abutment with the layer filter guide structure and forces the layer filter guide structure to be tightly abutted, and finally the upper die head and a lower die shell are bolted, so that the molten aluminum flows through the disc type feeding head, the layer filter guide structure, the lower die shell and the material collecting type die rod core in sequence and is extruded into a circular pipe, thereby solving the problems in the prior art.

[0005] To achieve the above object, the present application provides the following technical solutions: an automobile rotary extrusion die core, comprising a lower die shell, an upper die head bolted at the upper end opening position of the lower die shell, a disc type feeding head bolted at the top flange of the upper die head, and a layer filter guide structure installed inside the upper die head below the disc type feeding head, wherein a material collecting type die rod core is threadedly installed at the bottom end opening position of the upper die head, the upper end surface of the material collecting type die rod core is in contact with the lower end surface of the layer filter guide structure, and the lower end of the material collecting type die rod core extends into the interior of the lower die shell.

[0006] Preferably, the lower die shell comprises a bottom disc arranged directly below the upper die head, an upper closed hollow material collecting seat integrally formed at the center position of the top end of the bottom disc, and a top disc fixedly welded at the top end of the upper closed hollow material collecting seat, wherein the top disc is bolted with the lower end of the upper die head, and a discharging hole for the concentric insertion of the lower end of the material collecting type die rod core is arranged at the center position in the interior of the bottom disc.

[0007] Preferably, support arms are integrally formed at both side edge positions of the top end of the bottom disc, and the upper ends of the support arms are connected with the outer wall of the top disc.

[0008] Preferably, the disc type feeding head is composed of a flange plate, a center nozzle and a horn plate, the flange plate is bolted at the top end opening position of the upper die head, the center nozzle is fixed at the center position in the interior of the flange plate, and the horn plate is integrally formed at the edge position of the bottom end of the center nozzle.

[0009] Preferably, an annular supporting rim is integrally formed at one end in the interior of the upper die head, and the upper surface of the annular supporting rim is in contact with the lower surface of the horn plate.

[0010] Preferably, the layer filter guide structure comprises an upper material guiding disc installed in the interior of the upper die head below the annular supporting rim, and a filter disc and a lower material discharging disc are sequentially and superimposedly installed at the bottom end of the upper material guiding disc.

[0011] Preferably, the top end of the upper material guiding disc is provided with a complete center material guiding hole, and the edge of the interior of the upper material guiding disc is provided with four annular equidistant arc-shaped material guiding holes; the filter disc is concentrically embedded at the bottom end of the upper material guiding disc; the upper surface of the lower material discharging disc is provided with an annular sunken cavity, and the interior of the annular sunken cavity is provided with a downwardly penetrating first material hole and a second material hole; the bottom end of the lower material discharging disc below the first material hole is integrally formed with a circular material channel; and the bottom end of the lower material discharging disc below the second material hole is integrally formed with an arc-shaped material channel.

[0012] Preferably, the material collecting type die rod core comprises a lower material guiding cover mounted at one end of the interior of the upper die head, an outer threaded sleeve rotatably mounted on the outer circumferential surface of the lower material guiding cover, and two symmetrical connecting bridges integrally formed in the opening at the bottom end of the lower material guiding cover, and a downwardly extending rod core body integrally formed between the two connecting bridges; the lower end of the rod core body extends into the material discharging hole; the upper end surface of the lower material guiding cover is in contact with the lower end surface of the lower material discharging disc; and a hexagonal pin is mounted at one side edge position of the bottom end of the outer threaded sleeve.

[0013] Preferably, a protruding part is integrally formed on the inner wall of the lower material guiding cover, and an inner recessed part for plug-in cooperation with the protruding part is arranged on the outer wall of the circular material channel.

[0014] The application also provides a working method of the automobile rotating body extrusion die core.

[0015] S101: high-temperature molten aluminum material is injected from the extruder barrel into the internal cavity of the disc type material feeding head, the material flow is uniformly diffused in the cavity, and then enters the layer type filter material flow guiding structure through the material discharging hole at the bottom of the disc type material feeding head; the aluminum material flow vertically penetrates into the layer type filter material flow guiding structure, and the impurities are gradually intercepted by the multiple layers of filter screens in the layer type filter material flow guiding structure; the flow guiding plate combs the turbulent flow into laminar flow, and eliminates vortex dead zones through the flow channel design; and the purified aluminum material enters the lower flow collecting area at a stable flow rate;

[0016] S102: the aluminum material reaches the conical material collecting cavity at the top of the material collecting type die rod core, and is recombined into a ring-shaped melt; under the driving of the extrusion pressure, the melt flows downward along the precise annular gap formed between the outer wall of the material collecting type die rod core and the inner wall of the lower die shell;

[0017] S103: when the melt flows through the annular gap, it is compressed and shaped into a thin-walled tubular shape under the constraint of the working zone of the material collecting type die rod core and the sizing zone of the lower die shell; the shaped aluminum pipe is extruded from the die hole at the bottom end of the lower die shell, is straightened by the traction device, and is cooled and solidified to obtain an aluminum round pipe with accurate size and smooth surface.

[0018] Compared with the prior art, the automobile rotating extrusion die and the working method thereof have the beneficial effects that: the automobile rotating extrusion die and the working method thereof are provided with the disc-type feeding head, the upper die head, the layer-type filter flow guide structure, the material collecting type die rod core and the lower die shell and the like which are cooperated with each other, the layer-type filter flow guide structure is installed into the upper die head from the lower end, the disc-type feeding head is fixedly connected to the upper end opening of the upper die head, the material collecting type die rod core is threadedly installed at the lower end of the upper die head, until the material collecting type die rod core is butted with the layer-type filter flow guide structure and forces the layer-type filter flow guide structure to be tightly abutted, and finally the upper die head and the lower die shell are fixedly connected, at this time, the molten aluminum flows through the disc-type feeding head, the layer-type filter flow guide structure, the lower die shell and the material collecting type die rod core in sequence and is extruded into a circular pipe, by installing the layer-type filter flow guide structure into the upper die head from the lower end, cooperating with the reasonable layout of the disc-type feeding head and the material collecting type die rod core, a compact, easy-to-disassemble, smooth-flowing and easy-to-maintain extrusion die is formed, not only the operation efficiency and the maintenance convenience of the die are improved, but also the flow quality of the aluminum material is improved, and the high quality of the circular pipe product and the continuity of the production are ensured;

[0019] The layer-type filter flow guide structure, the disc-type feeding head and the material collecting type die rod core are distributed in a definite order to form a modular structure system, the operator only needs to disassemble the corresponding connecting part to easily take out a certain component for cleaning, repairing or replacing, the modular design not only shortens the maintenance time of the die core, but also reduces the operation difficulty and the risk of die damage caused by improper disassembly, when the material collecting type die rod core is screwed into the upper die head from the lower end, the front end thereof is automatically abutted against the lower end surface of the layer-type filter flow guide structure through thread advancement to form self-centering axial pressure, this process relies on the linear motion guided by the thread to avoid the radial adjustment required by the traditional nested structure, naturally ensures the coaxiality of the die rod core and the flow guide structure, and the locking force is uniform and controllable; secondly, the installation position of the layer-type filter flow guide structure in the upper die head can effectively filter impurities and reduce the influence of impurities on the product quality, meanwhile, the fluid is guided step by step through the disc-type feeding head, the layer-type filter flow guide structure, the lower die shell and the material collecting type die rod core to form a smooth and continuous flow path, which helps to reduce the problems of pressure fluctuation and uneven flow, not only improves the dimensional accuracy and surface quality of the aluminum pipe, but also reduces the defect rate caused by poor flow;

[0020] Finally, due to the convenient disassembly and assembly, the maintenance and cleaning work is more frequent and efficient, the accumulated impurities and residues can be removed in time to reduce the risk of die wear and corrosion, and the modular structure design can replace the damaged or severely worn parts when necessary without replacing the entire die, thereby reducing the maintenance cost and prolonging the service life of the die. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a schematic view of the three-dimensional structure of the present application;

[0022] Figure 2It is a schematic diagram of the main sectional structure of the present application;

[0023] Figure 3 It is a schematic diagram of the sectional structure of the present application Figure 1 ;

[0024] Figure 4 It is a schematic diagram of the sectional structure of the present application Figure 2 ;

[0025] Figure 5 It is a schematic diagram of the sectional structure of the disc feeding head, the upper die head, the layer filter material guide structure, and the material collecting type die rod core separation state of the present application;

[0026] Figure 6 It is an exploded structure schematic diagram of the layer filter material guide structure of the second embodiment of the present application Figure 1 ;

[0027] Figure 7 It is an exploded structure schematic diagram of the layer filter material guide structure of the second embodiment of the present application Figure 2 ;

[0028] Figure 8 It is a schematic diagram of the sectional structure of the material collecting type die rod core of the third embodiment of the present application;

[0029] Figure 9 It is a schematic diagram of the sectional structure of the material collecting type die rod core of the third embodiment of the present application.

[0030] In the figure: 1, lower die shell; 101, bottom disc; 102, top disc; 103, support arm; 104, upper closed hollow material collecting seat; 105, discharge hole; 2, upper die head; 201, annular supporting rim; 3, disc feeding head; 301, flange plate; 302, center nozzle; 303, trumpet disc; 4, layer filter material guide structure; 401, upper material guiding disc; 402, filter disc; 403, lower material discharging disc; 5, material collecting type die rod core; 501, lower material guiding cover; 502, protruding part; 503, rod core body; 504, connecting bridge; 505, outer threaded sleeve; 5051, inner hexagonal protruding pin; 6, arc-shaped material guiding hole; 7, center material guiding hole; 8, annular sunken cavity; 9, first material hole; 10, second material hole; 11, arc-shaped material channel; 12, circular material channel; 1201, inner recessed part. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0032] Embodiment one, by Figures 1 to 5The present application comprises a lower mold shell 1, an upper mold head 2 bolted and installed at the opening position of the upper end of the lower mold shell 1, a disc type feeding head 3 flange bolted and installed at the top end of the upper mold head 2, and a layered filter material guide structure 4 installed inside the upper mold head 2 below the disc type feeding head 3, a material collecting type mold rod core 5 is screw installed at the opening position of the bottom end of the upper mold head 2, the upper end surface of the material collecting type mold rod core 5 and the lower end surface of the layered filter material guide structure 4 are in contact with each other, and the lower end of the material collecting type mold rod core 5 extends to the inside of the lower mold shell 1.

[0033] The lower mold shell 1 comprises a bottom disc 101 arranged directly below the upper mold head 2, an upper closing hollow material collecting seat 104 integrally formed at the center position of the top end of the bottom disc 101, and a top disc 102 welded and fixed at the top end of the upper closing hollow material collecting seat 104, the top disc 102 is bolted with the lower end of the upper mold head 2, and a discharging hole 105 for the concentric insertion of the lower end of the material collecting type mold rod core 5 is arranged at the center position inside the bottom disc 101.

[0034] The bottom disc 101 is integrally formed with a support arm 103 at the side edge position of the top end, and the upper end of the support arm 103 is connected with the outer wall of the top disc 102.

[0035] The working method of the automobile rotating body extrusion mold core of the embodiment, like the automobile rotating body extrusion mold core described above, comprises the following steps:

[0036] S101: High-temperature molten aluminum material is injected from the extruder barrel into the internal cavity of the disc type feeding head 3, the material flow is uniformly diffused in the cavity, then enters the layered filter material guide structure 4 through the discharging port at the bottom of the disc type feeding head 3, the aluminum material flow penetrates vertically into the layered filter material guide structure 4, the impurities are intercepted step by step by the multiple layers of filter screens inside the layered filter material guide structure 4, the turbulence is combed into laminar flow by the guide plate, and the vortex dead zone is eliminated through the flow channel design, and the purified aluminum material enters the lower flow collection area at a stable flow rate;

[0037] S102: The aluminum material reaches the conical material collecting cavity at the top of the material collecting type mold rod core 5, and is recombined into a ring-shaped melt here, and under the driving of the extrusion pressure, the melt flows downward along the precise annular gap formed between the outer wall of the material collecting type mold rod core 5 and the inner wall of the lower mold shell 1;

[0038] S103: When the melt flows through the annular gap, it is compressed and shaped into a thin-walled tubular shape under the constraint of the working belt of the material collecting type mold rod core 5 and the sizing belt of the lower mold shell 1, the shaped aluminum pipe is extruded from the bottom end mold hole of the lower mold shell 1, is straightened by the traction device and is cooled and solidified to obtain an aluminum round pipe with accurate size and smooth surface.

[0039] Embodiment two, on the basis of embodiment one, Figure 5 、 Figure 6 、 Figure 7The high-efficiency guiding effect of the disc type feeding head 3 is given, so that the aluminum material is uniformly distributed before entering the mold, laying a foundation for the subsequent extrusion process. The disc type feeding head 3 is composed of a flange plate 301, a center nozzle 302 and a horn plate 303. The flange plate 301 is bolted and installed at the top opening position of the upper mold head 2. The center nozzle 302 is fixed at the center position inside the flange plate 301. The horn plate 303 is integrally formed at the edge position of the bottom end of the center nozzle 302.

[0040] An annular supporting rim 201 is integrally formed at one end inside the upper mold head 2. The upper surface of the annular supporting rim 201 is in contact with the lower surface of the horn plate 303. The flange plate 301 is bolted to the upper port of the upper mold head 2 by bolts, and the center nozzle 302 is concentrically sleeved with the upper mold head 2 until the lower end surface of the horn plate 303 is in contact with the upper end surface of the annular supporting rim 201. At this time, the molten aluminum material is gathered in the annular chamber inside the center nozzle 302, ensuring the stability of the material flow in the subsequent flow channel from the source;

[0041] The layered filter material guiding structure 4 includes an upper material guiding disc 401 installed inside the upper mold head 2 below the annular supporting rim 201, and a filter disc 402 and a lower material discharging disc 403 successively stacked at the bottom end of the upper material guiding disc 401. The upper material guiding disc 401, the filter disc 402 and the lower material discharging disc 403 are concentrically stacked in sequence, and the stacked upper material guiding disc 401, the filter disc 402 and the lower material discharging disc 403 are loaded into the upper mold head 2 from the lower port of the upper mold head 2.

[0042] A completely penetrating center material guiding hole 7 is provided at the center position of the top end of the upper material guiding disc 401. Four annular equidistant arc-shaped material guiding holes 6 are provided at the edge position inside the upper material guiding disc 401. The filter disc 402 is concentrically embedded and installed at the bottom end of the upper material guiding disc 401. The upper surface of the lower material discharging disc 403 is provided with an annular sunken cavity 8. The inside of the annular sunken cavity 8 is provided with a downwardly penetrating first material hole 9 and a second material hole 10. A circular material channel 12 is integrally formed at the bottom end of the lower material discharging disc 403 below the first material hole 9. An arc-shaped material channel 11 is integrally formed at the bottom end of the lower material discharging disc 403 below the second material hole 10. When the disc type feeding head 3 sends the molten aluminum material into the upper mold head 2, the molten aluminum material will pass through the upper material guiding disc 401 from the center material guiding hole 7 and the arc-shaped material guiding hole 6, and continue to flow through the filter disc 402 and gather at the annular sunken cavity 8. At this time, the molten aluminum material will enter the circular material channel 12 and the arc-shaped material channel 11 through the first material hole 9 and the second material hole 10. At this time, the multi-layer filtering design can effectively block impurities and inclusions, ensure that the aluminum material entering the mold cavity is pure, thereby reducing defects and improving the overall quality of the product;

[0043] The layered flow guides of the arc-shaped feed hole 6, the central feed hole 7, the annular recessed cavity 8, the first feed hole 9, and the second feed hole 10 can adjust the flow path of the aluminum material, making its flow in the mold more uniform, avoiding local accumulation or gas stagnation, and ensuring a balanced pressure distribution of the aluminum material in the mold cavity.

[0044] Example 3, based on Example 2, by Figure 8 and Figure 9 The material collection type mold rod core 5 includes a lower guide cover 501 installed inside one end of the upper mold head 2, an external threaded sleeve 505 rotatably installed on the outer peripheral surface of the lower guide cover 501, and two symmetrical connecting bridges 504 integrally formed in the bottom opening of the lower guide cover 501. A rod core body 503 extending downward is integrally formed between the two connecting bridges 504. The lower end of the rod core body 503 extends into the discharge hole 105. The upper end face of the lower guide cover 501 is in contact with the lower end face of the lower discharge plate 403. An internal hexagonal protrusion 5051 is installed at one edge of the bottom end of the external threaded sleeve 505.

[0045] When the material collecting mold rod core 5 is assembled into the upper mold head 2, the upper end of the lower guide cover 501 is concentrically fitted with the lower discharge plate 403. During this process, the operator forces the external threaded sleeve 505 to rotate by the internal hexagonal protrusion 5051. At this time, the internal hexagonal protrusion 5051 revolves around the central axis of the lower guide cover 501. Then, the external threaded sleeve 505 engages with the threaded groove on the inner wall of the upper mold head 2, so that the external threaded sleeve 505, the lower guide cover 501 and the rod core body 503 move upward until the upper end face of the lower guide cover 501 contacts the lower end face of the lower discharge plate 403. At this time, the rod core body 503 is located in the discharge hole 105 of the lower mold shell 1, providing necessary support during the extrusion process to prevent the mold cavity from deforming or displacing.

[0046] The inner wall of the lower guide cover 501 is integrally formed with a protrusion 502, and the outer wall of the circular material channel 12 is provided with a concave part 1201 for interlocking with the protrusion 502. The protrusion 502 and the concave part 1201 on the outer wall of the circular material channel 12 are interlocked to ensure the docking stability of the lower discharge tray 403 and the circular material channel 12.

[0047] The lower guide cover 501 collects the filtered aluminum material and enters the upper constriction hollow material collection seat 104. The upper constriction hollow material collection seat 104 redistributes the aluminum material into melt. The rod core body 503 and the lower mold shell 1 form a precision annular gap. The melt flow rate is controlled by the length of the working belt. The discharge hole 105 cooperates with the rod core body 503 to form the final forming annular gap. The sizing belt applies high pressure friction constraint to accurately shape the outer diameter of the tube.

[0048] The application is used, first, the staff cleans each lower mold shell 1, upper mold head 2, disc type feeding head 3, layer type filter material guide structure 4, and material collecting type mold rod core 5, to ensure that there is no impurity, oil stain or residue, to avoid affecting the flow of aluminum material and the quality of the product, then the layer type filter material guide structure 4 is installed to the predetermined position of the upper mold head 2, to ensure that the layer type filter material guide structure 4 is tightly attached to the matching surface of the upper mold head 2, to avoid leakage or impurities entering the mold cavity; the material collecting type mold rod core 5 is screwed into the bottom threaded groove of the upper mold head 2 from below, and is continuously screwed until the top end of the material collecting type mold rod core 5 abuts against the lower end surface of the layer type filter material guide structure 4, the axial pressure generated by the screwing forces the layer type filter material guide structure 4 to displace upward, and finally tightly attaches to the inner top surface of the upper mold head 2, and the process automatically completes the concentric centering of the guide structure and the mold rod core; the disc type feeding head 3 is concentrically covered on the opening at the upper end of the upper mold head 2, the bottom flow channel of the disc type feeding head 3 is precisely connected with the upper end of the layer type filter material guide structure 4, then a high-strength bolt is used to pass through the disc type feeding head 3 and is bolted and fixed with the threaded hole at the top of the upper mold head 2, and uniform torque is applied to ensure sealing; the lower mold shell 1 is sleeved outside the material collecting type mold rod core 5, the inner wall of the lower mold shell 1 and the outer surface of the material collecting type mold rod core 5 form an annular gap, and the upper flange of the lower mold shell 1 is bolted with the lower end flange of the upper mold head 2 through circumferential bolts, and after locking, the disc type feeding head 3, the upper mold head 2 and the lower mold shell 1 form a rigid sealed whole.

[0049] It should be noted that the relational terms herein such as first and second and the like are used solely to distinguish one entity or action from another, without necessarily requiring or implying any such actual relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0050] Although embodiments of the present application have been shown and described, it is to be understood that various modifications, substitutions, replacements and variations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A rotary extrusion die core for automobiles, characterized in that: The system includes a lower mold shell (1), an upper mold head (2) bolted to the upper opening of the lower mold shell (1), a disc feed head (3) bolted to the top flange of the upper mold head (2), and a layered filter media guide structure (4) installed inside the upper mold head (2) below the disc feed head (3). A material-collecting mold rod core (5) is threadedly installed at the bottom opening of the upper mold head (2). The upper end face of the material-collecting mold rod core (5) is in contact with the lower end face of the layered filter media guide structure (4). The lower end of the material-collecting mold rod core (5) extends into the interior of the lower mold shell (1). The lower mold shell (1) includes a base plate (101) located directly below the upper mold head (2). (101) An integrally formed upper-closing hollow material collection seat (104) at the top center position and a top plate (102) welded and fixed to the top of the upper-closing hollow material collection seat (104). The top plate (102) is bolted to the lower end of the upper die head (2). A discharge hole (105) is provided at the center position inside the base plate (101) for the lower end of the material collection mold rod core (5) to be inserted concentrically. The disc-type feed head (3) is composed of a flange (301), a center nozzle (302) and a horn plate (303). The flange (301) is bolted to the top opening position of the upper die head (2). The center nozzle (302) is fixed to the flange (301). At the center of the interior of 301), the horn disc (303) is integrally formed at the edge of the bottom end of the center nozzle (302); an annular support edge (201) is integrally formed at one end of the interior of the upper die head (2), and the upper surface of the annular support edge (201) is in contact with the lower surface of the horn disc (303); the layered filter media guiding structure (4) includes an upper feed plate (401) installed inside the upper die head (2) below the annular support edge (201) and filter discs (402) and lower discharge discs (403) sequentially stacked at the bottom end of the upper feed plate (401); a complete [something] is provided at the center of the top of the upper feed plate (401). The central feed hole (7) is through the upper feed plate (401). Four equally spaced arc-shaped feed holes (6) are provided at the edge of the upper feed plate (401). The filter plate (402) is concentrically embedded at the bottom of the upper feed plate (401). An annular sinking cavity (8) is provided on the upper surface of the lower discharge plate (403). The annular sinking cavity (8) is provided with a first feed hole (9) and a second feed hole (10) that penetrate downwards. A circular channel (12) is integrally formed at the bottom of the lower discharge plate (403) below the first feed hole (9). An arc-shaped channel (11) is integrally formed at the bottom of the lower discharge plate (403) below the second feed hole (10).The material-collecting mold rod core (5) includes a lower guide cover (501) installed inside one end of the upper mold head (2), an external threaded sleeve (505) rotatably mounted on the outer circumferential surface of the lower guide cover (501), and two symmetrical connecting bridges (504) integrally formed in the bottom opening of the lower guide cover (501). A rod core body (503) extending downward is integrally formed between the two connecting bridges (504). The lower end of the rod core body (503) extends into the discharge hole (105). The upper end face of the lower guide cover (501) is in contact with the lower end face of the lower discharge plate (403). An internal hexagonal convex pin (5051) is installed at one edge of the bottom end of the external threaded sleeve (505).

2. The automotive rotary extrusion die core according to claim 1, characterized in that: Support arms (103) are integrally formed on both sides of the top edge of the chassis (101), and the upper end of the support arms (103) is connected to the outer wall of the top plate (102).

3. The automotive rotary extrusion die core according to claim 2, characterized in that: The inner wall of the lower guide cover (501) is integrally formed with a protrusion (502), and the outer wall of the circular material channel (12) is provided with a concave part (1201) for inserting and cooperating with the protrusion (502).

4. A method for operating a rotary extrusion die core for automobiles, comprising the rotary extrusion die core as described in any one of claims 1-3, characterized in that: Includes the following steps: S101: High-temperature molten aluminum material is injected from the extruder barrel into the internal chamber of the disc feed head (3). The material flow is evenly diffused in the chamber and then enters the layered filter material guide structure (4) through the discharge port at the bottom of the disc feed head (3). The aluminum material flow vertically penetrates the layered filter material guide structure (4). The multi-layer filter screen inside the layered filter material guide structure (4) intercepts impurities step by step. The guide plate sorts the turbulent flow into laminar flow and eliminates the vortex dead zone through the flow channel design. The purified aluminum material enters the lower confluence area at a stable flow rate. S102: The aluminum material arrives at the conical collecting cavity at the top of the collecting mold core (5), where it reassembles into an annular melt. Driven by the extrusion pressure, the melt flows downward along the precise annular gap formed between the outer wall of the collecting mold core (5) and the inner wall of the lower mold shell (1). S103: When the melt flows through the annular gap, it is constrained by the working belt of the aggregate mold core (5) and the sizing belt of the lower mold shell (1), and is compressed and shaped into a thin-walled tube. The formed aluminum tube is extruded from the bottom mold hole of the lower mold shell (1), straightened by the traction device and cooled and solidified to obtain an aluminum round tube with accurate dimensions and smooth surface.

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