Magnesium alloy filament extrusion die
By designing a magnesium alloy filament extrusion die and optimizing the extrusion process of rare earth magnesium alloy, the problems of long process flow, low efficiency and poor product quality in the existing technology are solved, and efficient and low-cost production of magnesium alloy filaments is achieved.
Patent Information
- Application Number
- CN202422756033.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-12
- Publication Date
- 2025-10-03
- Estimated Expiration
- 2034-11-12
AI Technical Summary
The existing rare earth magnesium alloy welding wire for additive manufacturing has a long process flow, low production efficiency and process yield, poor plastic deformation ability, especially the surface of the extruded product after rare earth elements is not smooth, prone to extrusion cracking and wire drawing defects, making it difficult to obtain high-quality magnesium alloy filaments.
A magnesium alloy filament extrusion die was designed, including a specific block and tapered transition cavity structure, combined with a heating ring and resistance wire, to optimize the fluidity of the magnesium alloy during the extrusion process and avoid fracture through temperature control. The die can be directly loaded onto a general horizontal extruder.
The forming ability of magnesium alloy wire is improved, the processing difficulty and cost are reduced, the process flow is simplified, it is suitable for large-scale production, and product quality and production efficiency are ensured.
Smart Images
Figure CN223405689U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of magnesium alloy processing, in particular to a magnesium alloy filament extrusion die. Background Art
[0002] Magnesium alloy is the lightest metal structural material, boasting high specific strength, high specific stiffness, and excellent thermal conductivity. Its shock absorption performance is over 10 times greater than that of aluminum alloy. In recent years, magnesium alloys have attracted widespread attention and application in fields such as new energy vehicles, the aviation industry, and rail vehicles due to their excellent lightweight properties. Rare earth magnesium alloys (Mg-RE), in particular, possess high strength, excellent heat resistance, and superior creep resistance, making them valuable for lightweighting aerospace components such as housings, brackets, and casings.
[0003] The lightweight, high-performance magnesium alloy castings and deformable magnesium alloy components required for aerospace applications often suffer from long manufacturing cycles, low material utilization, and difficulty in plastic deformation using traditional processes such as casting or forging. Wire-fed additive manufacturing (AM) directly forms components by depositing melted wire layer by layer, offering significant advantages in flexible manufacturing. Wire-fed AM offers improved safety, lower manufacturing costs, and the ability to rapidly and efficiently produce large-scale magnesium alloy components with high quality. Conventional aluminum alloy wire can be directly extruded, simplifying the process and reducing costs. Common AZ31B magnesium alloys can also be directly extruded into wires with diameters exceeding 1.0 mm and varying thicknesses. However, rare earth magnesium alloys are more difficult to deform due to their high extrusion ratios and high alloy strength, making deformation more difficult. Extrusion dies are prone to flow blockage, limiting the diameter of extruded wires to typically 4-5 mm or larger. Common AM wire diameters are around 1.8 mm or 1.2 mm, making the extrusion of fine rare earth magnesium alloy wires challenging.
[0004] Existing rare earth magnesium alloy welding wires for additive manufacturing are often produced by first hot extruding a thicker wire and then drawing it into a 1.2 mm wire through multiple annealing processes. This process is long, and the production efficiency and process yield are low. Magnesium alloy has a close-packed hexagonal structure and poor plastic deformation ability. Especially after adding rare earth elements, the surface of the extruded product is not smooth and is prone to defects such as cracking and wiredrawing. It is difficult to obtain high-quality magnesium alloy filaments, which is an existing problem that urgently needs to be solved. Utility Model Content
[0005] In response to the shortcomings of the existing technology, the utility model provides a magnesium alloy filament extrusion die, which solves the problem that the existing rare earth magnesium alloy welding wire for additive manufacturing is often first hot extruded into a thicker wire, and then drawn into a 1.2mm wire through multiple annealing processes. The process flow is long, and the production efficiency and process yield are low. The magnesium alloy has a close-packed hexagonal structure and its plastic deformation ability is poor. Especially after adding rare earth elements, the surface of the extruded product is not smooth and is prone to defects such as cracking and wiredrawing, making it difficult to obtain high-quality magnesium alloy filaments.
[0006] To achieve the above-mentioned objectives, the present invention is implemented through the following technical solutions: a magnesium alloy filament extrusion die, comprising a first block, a second block is arranged on the top of the first block, the inner walls of the first block and the second block are threadedly connected with a first fixing bolt, a third block is arranged on the top of the second block, a fourth block is arranged on the top of the third block, the inner walls of the third block and the fourth block are threadedly connected with a second fixing bolt, a necking cavity is machined inside the fourth block, a first conical transition cavity is machined inside the third block, a second conical transition cavity is machined inside the second block, a sizing working cavity is machined inside the first block, a drainage section is arranged below the first block, and the necking cavity, the first conical transition cavity, the second conical transition cavity, the sizing working cavity and the drainage section are connected.
[0007] Preferably, heating rings are attached to the outer walls of the first block, the second block, the third block and the fourth block, and resistance wires are installed inside the heating rings.
[0008] Preferably, a cavity is machined inside the heating ring, and a limiting block is provided below the inside of the heating ring, and the outer wall of the limiting block is movably connected to the bottom groove of the first block.
[0009] Preferably, an extrusion cylinder is threadedly connected to the upper part of the outer wall of the heating ring, an extrusion cavity is processed inside the extrusion cylinder, the bottom of the extrusion cylinder is tightly pressed against the top of the fourth block, a limiting ring is installed at the bottom of the extrusion cylinder, and the outer wall of the limiting ring is movably connected to the inner wall of the heating ring.
[0010] Preferably, a temperature sensor is installed inside the extrusion cylinder.
[0011] Beneficial effects
[0012] The utility model provides a magnesium alloy filament extrusion die. It has the following beneficial effects: the magnesium alloy filament extrusion die can improve the uniform fluidity of the magnesium alloy during the extrusion process through the cooperation of the first group block, the second group block, the third group block, the fourth group block, the necking cavity, the first tapered transition cavity, the second tapered transition cavity, the sizing working cavity, the drainage section, the first fixing bolt and the second fixing bolt. In particular, the design of the tapered angle and each gradient platform can optimize the flow of the rod in the die under high-temperature extrusion. Although the pressure of the extrusion breakthrough is increased, the fluidity of the magnesium alloy after the extrusion breakthrough can be enhanced, thereby improving the forming ability of the high-strength magnesium alloy wire. In addition, the die body can be directly loaded onto a general horizontal extruder without the need to modify the expensive cost of the extruder. The preparation of the filament can save the drawing pass of the final product, which not only saves a lot of time but also has low cost and a simple process flow, and is suitable for large-scale production applications. At the same time, the high-precision extrusion cavity can be processed in sections, thereby reducing the processing difficulty. When damage occurs, the section can be replaced.
[0013] By combining the heating ring, resistance wire and temperature sensor, the mold can be kept at a certain temperature during extrusion, thus ensuring the normal processing operation. This can effectively avoid the phenomenon of breakage due to low temperature, thereby improving the production quality of the product. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 This is a schematic diagram of the structure of the utility model;
[0015] Figure 2 for Figure 1 sectional view of
[0016] Figure 3 for Figure 2 Schematic diagram of the structure of the middle extrusion cylinder, heating ring and limit ring;
[0017] Figure 4 for Figure 2 Schematic diagram of the structure of the second block, the first block and the first fixing bolt.
[0018] In the figure: 1. First block; 2. Second block; 3. Third block; 4. Fourth block; 5. Neck cavity; 6. First conical transition cavity; 7. Second conical transition cavity; 8. Sizing working cavity; 9. Drainage section; 10. First fixing bolt; 11. Second fixing bolt; 12. Heating ring; 13. Resistance wire; 14. Cavity; 15. Limit block; 16. Limit ring; 17. Temperature sensor; 18. Extrusion cylinder; 19. Extrusion cavity. DETAILED DESCRIPTION
[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.
[0020] By those skilled in the art, the components in this case are connected in sequence. The specific connection and operation sequence should refer to the following working principle. The detailed connection means are well-known technologies in this field. The following mainly introduces the working principle and process.
[0021] Existing rare earth magnesium alloy welding wire for additive manufacturing is often produced by first hot extruding a thicker wire and then drawing it through multiple annealing processes to form a 1.2 mm wire. This process is lengthy and has low production efficiency and yield. Magnesium alloy has a close-packed hexagonal structure and poor plastic deformation capacity. Especially after adding rare earth elements, the extruded product surface is not smooth and is prone to defects such as cracking and wire drawing, making it difficult to obtain high-quality magnesium alloy filaments.
[0022] In view of this, the utility model provides a magnesium alloy filament extrusion die, which can improve the uniform fluidity of the magnesium alloy during the extrusion process through the cooperation of the first block, the second block, the third block, the fourth block, the necking cavity, the first tapered transition cavity, the second tapered transition cavity, the sizing working cavity, the drainage section, the first fixing bolt and the second fixing bolt. In particular, the design of the tapered angle and each gradient platform can optimize the flow of the rod in the die under high-temperature extrusion. Although the pressure of the extrusion breakthrough is increased, the fluidity of the magnesium alloy after the extrusion breakthrough can be enhanced, thereby improving the forming ability of the high-strength magnesium alloy wire. In addition, the die body can be directly loaded onto a general horizontal extruder without the need to modify the expensive cost of the extruder. The preparation of the filament can save the drawing pass of the final product, which not only saves a lot of time, but also has low cost and a simple process flow, and is suitable for large-scale production applications. At the same time, the high-precision extrusion cavity can be processed in sections, thereby reducing the processing difficulty, and can also be replaced in sections when damage occurs.
[0023] Example 1: By Figure 1 、 2, 3 and 4 show that a magnesium alloy filament extrusion die comprises a first block 1, a second block 2 is provided on the top of the first block 1, the inner walls of the first block 1 and the second block 2 are threadedly connected with a first fixing bolt 10, a third block 3 is provided on the top of the second block 2, a fourth block 4 is provided on the top of the third block 3, the inner walls of the third block 3 and the fourth block 4 are threadedly connected with a second fixing bolt 11, a necking cavity 5 is machined inside the fourth block 4, a first conical transition cavity 6 is machined inside the third block 3, a second conical transition cavity 7 is machined inside the second block 2, a sizing working cavity 8 is machined inside the first block 1, a drainage section 9 is provided below the first block 1, and the necking cavity 5, the first conical transition cavity 6, the second conical transition cavity 7, the sizing working cavity 8 and the drainage section 9 are connected;
[0024] In the specific implementation process, it is worth noting that the inlet width of the first conical transition chamber 6 is 30-40 mm, the die angle of the first conical transition section is 20°, the step depth is 16-20 mm, the inlet width of the second conical transition chamber 7 is 14-17 mm, the die angle of the second conical transition chamber 7 is 15°, the platform depth is 14-17 mm, the diameter of the sizing working chamber 8 is 1.2 mm or 1.8 mm, the height of the sizing working chamber 8 is 3-5 mm, the diameter of the drainage section 9 is 5 mm, and the height is 3-5 mm. The specific values of the first conical transition chamber 6, the second conical transition chamber 7, the sizing working chamber 8 and the drainage section 9 can be selected according to actual use requirements. Here, only a reference value is provided. The specific situation can be selected according to actual use requirements.
[0025] Furthermore, the outer walls of the first block 1, the second block 2, the third block 3 and the fourth block 4 are attached with heating rings 12, and resistance wires 13 are installed inside the heating rings 12;
[0026] In the specific implementation process, it is worth noting that when the resistance wire 13 is in operation, the first block 1, the second block 2, the third block 3 and the fourth block 4 can be heated by the heating ring 12, so as to heat the material inside the mold to ensure a certain temperature value. The specifications of the resistance wire 13 are not limited, and can meet the use requirements.
[0027] Furthermore, a cavity 14 is machined inside the heating ring 12, and a limit block 15 is provided below the interior of the heating ring 12. The outer wall of the limit block 15 is movably connected to the bottom groove of the first block 1;
[0028] In the specific implementation process, it is worth noting that the cavity 14 can minimize the temperature dissipation of the resistance wire 13 during operation, thereby improving energy-saving performance.
[0029] Furthermore, an extrusion cylinder 18 is threadedly connected to the upper portion of the outer wall of the heating ring 12. An extrusion cavity 19 is machined inside the extrusion cylinder 18. The bottom of the extrusion cylinder 18 is tightly abutted against the top of the fourth block 4. A limit ring 16 is installed at the bottom of the extrusion cylinder 18. The outer wall of the limit ring 16 is movably connected to the inner wall of the heating ring 12.
[0030] In the specific implementation process, it is worth noting that the extrusion cylinder 18 is connected to a universal horizontal extruder outside. The specific connection method is not limited and can meet the use requirements. When installing the extrusion cylinder 18, the first block 1, the second block 2, the third block 3 and the fourth block 4 can be tightened and limited.
[0031] Furthermore, a temperature sensor 17 is installed inside the extrusion cylinder 18;
[0032] In the specific implementation process, it is worth noting that the model of the temperature sensor 17 is not limited, as long as it meets the use requirements. The temperature sensor 17 can detect the temperature of the mold through heat conduction, and then detect the temperature of the material inside the mold;
[0033] Specifically, when using the magnesium alloy filament extrusion die, the temperature of the magnesium alloy filament extrusion die is first heated to 440°C using the resistance wire 13, and the die is continuously heated by the resistance wire 13 during the extrusion process. Then, the extruded billet with a diameter of 80 mm is heated to 480°C by induction and kept warm for 2 hours. At the same time, the extrusion cylinder 18 is heated to 450°C. It should be noted that before extrusion, the surface temperature of the high-strength magnesium alloy billet needs to be cooled to 450-470°C for slow extrusion to obtain a magnesium alloy wire with a diameter of 1.2 mm.
[0034] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include," "comprise," or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations. The phrase "includes an element defined by..." does not exclude the presence of other identical elements in the process, method, article, or device that includes the element.
[0035] In the present invention, unless otherwise clearly stipulated and limited, the terms "install", "set", "connect", "fix", "screw" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the present invention according to the specific circumstances.
[0036] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. A magnesium alloy filament extrusion die, comprising a first block (1), characterized in that: A second block (2) is provided on the top of the first block (1), the inner walls of the first block (1) and the second block (2) are threadedly connected with a first fixing bolt (10), a third block (3) is provided on the top of the second block (2), a fourth block (4) is provided on the top of the third block (3), the inner walls of the third block (3) and the fourth block (4) are threadedly connected with a second fixing bolt (11), a necking cavity (5) is machined inside the fourth block (4), a first conical transition cavity (6) is machined inside the third block (3), a second conical transition cavity (7) is machined inside the second block (2), a sizing working cavity (8) is machined inside the first block (1), a drainage section (9) is provided below the first block (1), and the necking cavity (5), the first conical transition cavity (6), the second conical transition cavity (7), the sizing working cavity (8) and the drainage section (9) are connected.
2. The magnesium alloy filament extrusion die according to claim 1, characterized in that: The outer walls of the first block (1), the second block (2), the third block (3) and the fourth block (4) are fitted with heating rings (12), and resistance wires (13) are installed inside the heating rings (12).
3. The magnesium alloy filament extrusion die according to claim 2, characterized in that: A cavity (14) is machined inside the heating ring (12), and a limit block (15) is provided below the interior of the heating ring (12). The outer wall of the limit block (15) is movably connected to the bottom groove of the first block (1).
4. The magnesium alloy filament extrusion die according to claim 2, characterized in that: An extrusion cylinder (18) is threadedly connected to the upper portion of the outer wall of the heating ring (12), an extrusion cavity (19) is machined inside the extrusion cylinder (18), the bottom of the extrusion cylinder (18) is tightly pressed against the top of the fourth block (4), a limiting ring (16) is installed at the bottom of the extrusion cylinder (18), and the outer wall of the limiting ring (16) is movably connected to the inner wall of the heating ring (12).
5. The magnesium alloy filament extrusion die according to claim 4, characterized in that: A temperature sensor (17) is installed inside the extrusion cylinder (18).