L-shaped extrusion die

Abstract

The L-shaped extrusion die comprises an extrusion part and a mounting plate connected through a guide column arranged at the top of the extrusion part, a plurality of first pushing devices are evenly arranged at the bottom of the mounting plate in the circumferential direction in an array mode, the output ends of the first pushing devices are connected with a pressing plate, and the guide column penetrates through the pressing plate. The bottom of the pressing plate is connected with a male die assembly with the cylindrical upper half portion and the truncated-cone-shaped lower half portion. An extrusion cavity matched with the male die assembly in shape is formed in the extrusion part under the male die assembly, a mounting groove is formed in the bottom of the extrusion part from the side wall to the bottom of the extrusion cavity, and the cylindrical female die is clamped in the mounting groove through peripheral flanges; a through L-shaped discharging opening is formed in the center of the female die and right faces the center of the bottom of the extrusion cavity, and the inner diameter of the discharging opening is gradually reduced from top to bottom. Through multi-stage extrusion and pushing of the device, the uniform wall thickness of a finished product can be effectively ensured, bumps in the product are avoided, and defective products are reduced; meanwhile, the female die can be replaced in time, and product quality is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of alloy material processing, and particularly relates to an L-shaped extrusion die. Background Art

[0002] An alloy fitting refers to a fitting made of alloy materials. Alloy fittings are often processed and produced using extrusion dies. Extrusion is a plastic forming method in which an external force is applied to a metal ingot blank placed in an extrusion cylinder from one end, forcing it to flow out through a specific die hole to obtain a product with the required cross-sectional shape and size.

[0003] Chinese Patent CN203044561U discloses an industrial die, specifically a magnesium alloy semi-solid extrusion die used when extruding magnesium alloy straight and long products. Its punch is arranged below a fixed plate through a core and is movably connected to a choke block. The die cavity is arranged at the upper end of the forming die. The magnesium alloy slurry is placed in the middle of the die cavity and the forming die and is movably connected to a mandrel. Since this utility model designs a novel semi-solid extrusion forming die, compared with liquid die forging, it maintains the characteristics of semi-solid metal crystallizing, solidifying, and being forced to compensate for shrinkage under pressure, but can also form straight and long products that cannot be achieved by the liquid die forging process, reducing the process flow, shortening the processing cycle, saving energy and materials, greatly reducing production costs, and improving the product quality.

[0004] However, when this extrusion die is in use, the following problems exist: This extrusion die mainly extrudes the alloy slurry in the die cavity of the die cavity through the punch, so that the alloy slurry in the die cavity is extruded through the channel inside the forming die. Since the punch cannot enter the channel inside the forming die, after each extrusion forming is completed, a certain amount of alloy slurry will still remain inside the forming die. The fluidity of these alloy slurries becomes poor after cooling. If the interval time between two extrusion formings is relatively long, it is more difficult for the alloy slurry to be extruded through the channel inside the forming die during the next extrusion forming. Therefore, this patent provides an L-shaped extrusion die to solve the above problems. Summary of the Invention

[0005] The purpose of the present invention is to solve the deficiencies existing in the prior art and propose an L-shaped extrusion die.

[0006] To achieve the above purpose, the present invention adopts the following technical solutions:

[0007] An L-shaped extrusion die includes an extrusion part and a mounting plate connected by guide columns arranged on the top of the extrusion part. A plurality of first pushing devices are evenly arranged in a circumferential array at the bottom of the mounting plate. The output end of the first pushing device is connected to a pressing plate. The guide column penetrates through the pressing plate. The bottom of the pressing plate is connected to a punch assembly with a cylindrical upper half and a frustum-shaped lower half;

[0008] Below the punch assembly, an extrusion chamber matching the shape of the punch assembly is provided inside the extrusion part. An installation groove is opened at the bottom of the extrusion part from the side wall to the bottom of the extrusion chamber. The cylindrical die is clamped in the installation groove through the flanging around it; a through L-shaped discharge port is provided at the center of the die, and the discharge port faces the center of the bottom of the extrusion chamber and gradually reduces in inner diameter from top to bottom.

[0009] Further, the punch assembly includes a first push block, a second push block, and a third push block that are concentrically arranged from outside to inside. The bottoms of the first push block, the second push block, and the third push block are all frustum-shaped with the same slope, and the diameter of the small end of the frustum is the same as the diameter of the large end of another push block; the second push block and the third push block can move up and down inside the first push block. The first push block limits the second push block through a first limit card edge protruding from the inner wall of its bottom and a second limit card edge protruding from the outer wall of the top of the second push block. The second push block limits the third push block through a third limit card edge protruding from the inner wall of its bottom and a fourth limit card edge protruding from the outer wall of the top of the third push block.

[0010] A second pushing device is provided at the center of the bottom of the mounting plate. A through hole for the output end of the second pushing device to move up and down is provided at the center of the pressing plate; the output end of the second pushing device is connected to the top of the third push block.

[0011] Further, springs are provided in the cavities formed by the first limit card edge and the second limit card edge and by the third limit card edge and the fourth limit card edge.

[0012] Further, the extrusion chamber is divided into levels matching the punch assembly from top to bottom, and they are all cavities with a cylindrical upper end and a frustum-shaped lower end. A pressure sensor is provided on the frustum-shaped side wall at the bottom of the uppermost extrusion chamber. The output end of the pressure sensor is connected to a controller, and the output end of the controller is respectively connected to the first pushing device and the second pushing device.

[0013] Further, exhaust grooves are longitudinally provided on the outer side wall of the punch assembly.

[0014] Further, limiting grooves are also provided on both sides of the installation groove, and limiting blocks are also clamped in the installation groove. The shape of one side wall of the limiting block matches the shape of the die, and the limiting block is fixed in position in the limiting groove through a limiting bolt.

[0015] Further, the inner diameter of the discharge port is reduced 5 times.

[0016] The beneficial effects of the present invention are:

[0017] 1. The punch is divided into multiple levels for extrusion and pushing, which can effectively ensure the uniform wall thickness of the finished product and avoid defective products;

[0018] 2. The first driving device is connected to the pressing plate. A circular through-hole for the up-and-down displacement of the second driving device is provided in the center of the pressing plate. The pressing plate is connected to the first pushing block. The top of the third pushing block is connected to the second driving device. At the same time, springs are provided between the first, second, and third pushing blocks. In the relaxed state of the springs, the sidewall angles of the bottom frustum are the same, ensuring uniform pushing during operation. At the same time, grooves are provided on the sidewalls of the pushing blocks to allow the air in the extrusion groove to be discharged smoothly, avoiding bulges in the product.

[0019] 3. The L shape on the female mold is divided into five sections, further improving the product quality and avoiding bulges and hollowness. The female mold is clamped to the bottom of the extrusion groove through the clamping edges on the sidewalls, facilitating replacement in case of wear of the female mold after long-term contact with high temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic structural diagram of an L-shaped extrusion die proposed by the present invention;

[0021] Figure 2 is a schematic cross-sectional structural diagram of a punch assembly in an L-shaped extrusion die proposed by the present invention;

[0022] Figure 3 is a schematic enlarged cross-sectional structural diagram of an extrusion part in an L-shaped extrusion die proposed by the present invention;

[0023] Figure 4 is a schematic bottom view structural diagram of an extrusion part in an L-shaped extrusion die proposed by the present invention;

[0024] Figure 5 is a schematic structural diagram of a female mold in an L-shaped extrusion die proposed by the present invention.

[0025] In the figure: 1. Extrusion part; 11. Installation groove; 12. Limiting groove; 12. Extrusion chamber; 2. Punch assembly; 21. Pressing plate; 211. Through-hole; 22. First pushing block; 221. First limiting clamping edge; 23. Second pushing block; 231. Second limiting clamping edge; 232. Third limiting clamping edge; 24. Third pushing block; 241. Fourth limiting clamping edge; 25. Spring; 3. Installation plate; 31. Guide post; 4. First driving device; 5. Second driving device; 6. Female mold; 61. Discharge port; 62. Flanging; 7. Pressure sensor; 8. Limiting bolt. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0027] Refer to Figure 1 andFigures 4 - 5 , an L-shaped extrusion die, comprising an extrusion part 1 and a mounting plate 3 connected by a guide post 31 arranged on the top of the extrusion part 1. A plurality of first pushing devices 4 are evenly arranged in a circumferential array along the bottom of the mounting plate 3. The output end of the first pushing device 4 is connected with a pressing plate 21. The guide post 31 penetrates through the pressing plate 21. The bottom of the pressing plate 21 is connected with a punch assembly 2 with a cylindrical upper half and a frustum-shaped lower half.

[0028] Inside the extrusion part 1 directly below the punch assembly 2, there is an extrusion chamber 12 matching the shape of the punch assembly 2. An installation groove 11 is opened at the bottom of the extrusion part 1 from the side wall to the bottom of the extrusion chamber 12. The cylindrical die 6 is clamped in the installation groove 11 through flanges 62 around it. A through L-shaped discharge port 61 is provided at the center of the die 6, and the discharge port 61 is directly opposite the center of the bottom of the extrusion chamber 12 and the inner diameter decreases step by step from top to bottom.

[0029] Refer to Figure 2 , the punch assembly 2 includes a first push block 22, a second push block 23 and a third push block 24 which are concentrically arranged from outside to inside. The bottoms of the first push block 22, the second push block 23 and the third push block 24 are all frustum-shaped with the same slope, and the diameter of the small end of one frustum is the same as the diameter of the large end of another push block. The second push block 23 and the third push block 24 can move up and down inside the first push block 22. The first push block 22 limits the second push block 23 through a first limit card edge 221 protruding from the inner wall of its bottom and a second limit card edge 231 protruding from the outer wall of the top of the second push block 23. The second push block 23 limits the third push block 24 through a third limit card edge 232 protruding from the inner wall of its bottom and a fourth limit card edge 241 protruding from the outer wall of the top of the third push block 24.

[0030] At the center of the bottom of the mounting plate 3, there is a second pushing device 5. A through hole 211 for the output end of the second pushing device 5 to move up and down is provided at the center of the pressing plate 21. The output end of the second pushing device 5 is connected to the top of the third push block 24.

[0031] Springs 25 are provided in the cavities formed by the first limit card edge 221 and the second limit card edge 231 and by the third limit card edge 232 and the fourth limit card edge 241.

[0032] Refer to Figure 3 , the extrusion chamber 12 is divided into three levels from top to bottom to match the punch assembly 2, and all are cavities with a cylindrical upper end and a frustum-shaped lower end. A pressure sensor 7 is provided on the frustum-shaped side wall at the bottom of the uppermost extrusion chamber 12. The output end of the pressure sensor 7 is connected to a controller, and the output end of the controller is respectively connected to the first pushing device 4 and the second pushing device 5.

[0033] An exhaust groove is provided longitudinally on the outer side wall of the punch assembly 2.

[0034] Refer toFigure 4 , limiting slots 12 are further provided on both sides of the installation slot 11, and a limiting block 7 is also clamped in the installation slot 11. The shape of one side wall of the limiting block 7 matches that of the female mold 6, and the limiting block 7 is fixed in position in the limiting slot 12 through a limiting bolt 8.

[0035] Refer to Figure 5 , the inner diameter of the discharge port 61 is reduced 5 times.

[0036] During use, after the pressure sensor receives a pressure that no longer changes, it transmits the data to the controller. The controller controls the first pushing device to stop working, and at the same time drives the second pushing device to start working. The punch assembly is pushed in multiple stages, which can effectively ensure the uniform wall thickness of the finished product and avoid defective products;

[0037] The first pushing device is connected to the pressure plate. A circular through-hole for the up-and-down displacement of the second pushing device is provided in the center of the pressure plate. The pressure plate is connected to the first push block. The top of the third push block is connected to the second pushing device. At the same time, springs are provided between the first, second, and third push blocks. In the relaxed state of the springs, the side wall angles of the bottom frustum are the same, ensuring uniform extrusion of the raw material during pushing; at the same time, exhaust grooves are provided on the side walls of the push blocks, which can smoothly discharge the air in the extrusion groove and avoid bulges in the product;

[0038] The L-shaped discharge port on the female mold is divided into five sections, further improving the product quality and avoiding bulges and hollowness; the female mold is clamped to the bottom of the extrusion groove through the clamping edge on the side wall, which is convenient for replacement in case the female mold wears due to long-term contact with high temperature in the future.

[0039] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and all should be covered within the protection scope of the present invention.

Claims

1. An L-shaped extrusion die, characterized in that: It comprises an extrusion part (1) and a mounting plate (3) connected by a guide column (31) arranged at the top of the extrusion part (1); a plurality of first pushing devices (4) are arranged in a uniform array along the circumferential direction at the bottom of the mounting plate (3); an output end of the first pushing device (4) is connected to a pressing plate (21); the guide column (31) is arranged through the pressing plate (21); and a male mold component (2) having a cylindrical upper half and a truncated cone lower half is connected to the bottom of the pressing plate (21); An extrusion chamber (12) matching the shape of the punch assembly (2) is provided in the extrusion portion (1) directly below the punch assembly (2); a mounting groove (11) is provided at the bottom of the extrusion portion (1) from the side wall to the bottom of the extrusion chamber (12); a cylindrical die (6) is clamped in the mounting groove (11) by flanges (62) on all sides; a through L-shaped discharge port (61) is provided at the center of the die (6); the discharge port (61) is directly opposite to the bottom center of the extrusion chamber (12), and the inner diameter decreases step by step from top to bottom.

2. The L-shaped extrusion die according to claim 1, characterized in that: The male mold assembly (2) comprises a first push block (22), a second push block (23) and a third push block (24) which are arranged concentrically from the outside to the inside, and the bottoms of the first push block (22), the second push block (23) and the third push block (24) are all truncated cone-shaped with the same slope, and the diameter of the small round end is the same as the diameter of the large round end of the other push block; the second push block (23) and the third push block (24) can move up and down inside the first push block (22); the first push block (22) limits the second push block (23) by a first limit clamping edge (221) protruding from the inner wall of the bottom of the first push block (22) and a second limit clamping edge (231) protruding from the outer wall of the top of the second push block (23); the second push block (23) limits the third push block (24) by a third limit clamping edge (232) protruding from the inner wall of the bottom of the second push block (23) and a fourth limit clamping edge (241) protruding from the outer wall of the top of the third push block (24); A second pushing device (5) is provided at the bottom center of the mounting plate (3), and a through hole (211) is provided at the center of the pressing plate (21) for allowing the output end of the second pushing device (5) to move up and down; the output end of the second pushing device (5) is connected to the top of the third pushing block (24).

3. The L-shaped extrusion die according to claim 2, characterized in that: A spring (25) is provided in the cavity formed by the first position-limiting clamping edge (221) and the second position-limiting clamping edge (231) and the third position-limiting clamping edge (232) and the fourth position-limiting clamping edge (241).

4. The L-shaped extrusion die according to claim 3, characterized in that: The extrusion chamber (12) is divided into three levels from top to bottom to match the punch assembly (2), all of which are cavities with a cylindrical upper end and a conical lower end. A pressure sensor (7) is provided on the bottom conical side wall of the extrusion chamber (12) at the uppermost end. The output end of the pressure sensor (7) is connected to a controller, and the output end of the controller is respectively connected to the first pushing device (4) and the second pushing device (5).

5. The L-shaped extrusion die according to claim 3, characterized in that: An exhaust groove is provided on the outer side wall of the male mold assembly (2) along the longitudinal direction.

6. The L-shaped extrusion die according to claim 1, characterized in that: On both sides of the installation groove (11), limiting grooves (12) are further provided. A limiting block (7) is also clamped in the installation groove (11). The shape of one side wall of the limiting block (7) matches that of the female die (6). The limiting block (7) is fixed in position in the limiting groove (12) through a limiting bolt (8).

7. The L-shaped extrusion die according to claim 1, characterized in that: The inner diameter of the discharge port (61) is reduced 5 times.

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