Dynamic module traction horizontal continuous casting process and device for magnesium alloy bar

Abstract

The invention relates to the technical field of alloy continuous casting, and discloses a dynamic module traction horizontal continuous casting process and device for a magnesium alloy bar, and the dynamic module traction horizontal continuous casting process for the magnesium alloy bar comprises the following steps: S1, magnesium alloy melting and refining; s2, automatic liquid transfer; s3, quantitative casting; and S4, starting the dynamic module. S5, melt mold filling: after the melt enters the mold cavity, the mold drives the casting rod to move synchronously at the speed of 3-6 m / min; s6, synchronous solidification; s7, active demolding is conducted; s8, forced cooling; s9, cooling and recycling the mold; and S10, cast rod treatment and subsequent processing. The method is reasonable in design, through the dynamic module closed solidification technology, the magnesium alloy melt rapidly forms a compact solidification shell layer when making contact with the mold wall, air contact is completely isolated, and the magnesium alloy oxidation problem is fundamentally avoided.

Description

Technical Field

[0001] The invention relates to the technical field of alloy continuous casting, and in particular to a dynamic die group traction horizontal continuous casting process and device for magnesium alloy bars. Background Art

[0002] As the lightest metal structural material that can be mass-produced, magnesium alloy has been widely used in many fields, such as aerospace, automobiles, home appliances, construction, and handheld power tools. However, the production process and equipment of magnesium alloy continuous casting bars are still relatively backward, resulting in a series of problems such as low production efficiency, poor yield rate, and high cost. These problems directly affect the production cost of magnesium alloy profiles, which in turn restricts their application in a wider range. Therefore, how to develop more advanced magnesium alloy continuous casting processes and equipment to improve production efficiency, yield rate, and enhance automation has become a key issue that needs to be solved in the magnesium alloy industry.

[0003] The problem of high cost of casting blanks required for deformable magnesium alloys cannot be solved. The main reason is that the following problems cannot be effectively solved: (1) The casting and crystallization of vertical continuous casting technology are completely exposed to the atmosphere. The magnesium alloy is active and prone to secondary oxidation, resulting in the appearance of oxidized inclusions in the product. (2) Vertical continuous casting technology is limited by the height of the equipment, which requires a large plant height and high infrastructure costs. In addition, the produced billets are mainly large-section and short-length billets, which cannot fill the gap in the current market demand for slender cast bars. (3) Manual flow control requires high technical experience of employees, and poor control can easily lead to leakage accidents; (4) The casting speed cannot be too fast. If the liquid flow is too fast, it will be difficult to control. If the liquid cavity is unstable, the resulting casting will be difficult to meet the quality requirements, which will seriously restrict the production efficiency and product quality. (6) The vertical continuous casting smelting process requires the use of a large amount of protective atmosphere and flame retardants, which are heavily polluting gases and cause a serious greenhouse effect; Therefore, we propose a dynamic module traction horizontal continuous casting process and device for magnesium alloy bars to solve this problem. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings of the above-mentioned background technology and to propose a dynamic die-group traction horizontal continuous casting process and device for magnesium alloy bars.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: A dynamic die-pulling horizontal continuous casting process for magnesium alloy bars comprises the following steps: S1. Melting and Refining of Magnesium Alloy: The raw materials of magnesium alloy are heated in a closed melting furnace; during the melting process, other alloying elements are added to improve the fluidity and oxidation resistance of the alloy or enhance certain specific properties; S2. Automatic Liquid Transfer: The melt is transported to the holding ladle through a sealed metering pump liquid transfer system. The ladle is equipped with a liquid level probe to detect the liquid level in real-time. When the liquid transfer level reaches the upper limit, the liquid transfer stops. When the continuous casting production starts and the liquid level drops to the lower limit, the liquid transfer pump starts automatically to achieve continuous production, and the liquid level fluctuation range is controlled within 50 mm; S3. Quantitative Casting: The melt in the ladle is continuously injected into the continuous casting mold cavity through a quantitative casting valve that can precisely control the opening and closing action and a casting tube with a diameter smaller than the inner diameter of the mold cavity. There is a 600-mm height difference between the melt surface in the ladle and the casting tube orifice. The melt can maintain a flow rate of approximately 20 m / min under its own pressure when injected into the casting tube. The quantitative casting valve adopts a cone valve structure made of special heat-resistant steel, and the pouring system injects into the casting tube to ensure smooth flow; S4. Dynamic Module Start-up: The mold is preheated to about 150 °C, and a release agent is sprayed. The self-locking structure of the dynamic module not only ensures the stability of the mold cavity during casting and prevents the mold from opening and leaking due to liquid pressure, but also enables the two sets of molds to move synchronously. The lower mold is used as the driving force to drive the overall mold to move synchronously.

[0006] S5. Melt Filling: When the melt enters the mold cavity, the mold drives the casting rod to move synchronously at a speed of 3 - 6 m / min; S6. Simultaneous Solidification: After the melt contacts the mold wall, due to the heat conduction ability of the mold, the melt is rapidly cooled and immediately starts to solidify, forming a closed shell layer to prevent oxidation when contacting the air; S7. Active Demolding: When the surface of the casting rod solidifies to a strength of ≥50 MPa, the self-locking mechanism of the mold disengages, and the mold and the casting rod are actively separated to start demolding; S8. Forced Cooling: The core area of the casting rod that has not been completely solidified is rapidly cooled through powerful water cooling; S9. Mold Cooling and Reuse: After demolding, the mold is generally at about 300 - 500 °C and needs to be forced to cool through a water cooling zone, cooled to 150 - 200 °C, and then enters the casting zone under the traction of a chain structure. The self-locking mechanism is connected to form a mold cavity to receive the melt injection for the next casting, and the cycle repeats; Preferably, in S10, the specific steps are as follows: S1001. Fixed-length Cutting: The length of the casting rod needs to be accurately measured and cut. The common length range of the casting rod is 1 - 6 m, and it is cut according to the subsequent processing requirements; S1002. Surface grinding and coding: There may be some minor defects or oxide layers on the surface of the casting rod, so surface grinding treatment is required to ensure its smoothness and appearance. S1003. Packaging and warehousing: The ground and coded casting rods will finally be packaged for warehousing storage or transportation to customers.

[0007] Preferably, in the S1, a protective atmosphere is used during the melting process to avoid oxidation of the magnesium alloy. The protective atmosphere includes but is not limited to argon. The flow rate of the protective atmosphere is maintained at 10 - 15 L / min, and the temperature is controlled between 650 - 700 °C to ensure uniform alloy composition and no excessive oxidation.

[0008] Preferably, in the S2, the other alloying elements include but are not limited to aluminum, zinc, manganese, and rare earth elements.

[0009] Preferably, in the S3, the temperature of the holding ladle is controlled between 650 - 700 °C to ensure that the melt does not solidify prematurely due to too low temperature during transportation.

[0010] Preferably, in the S4, the melt is injected into the pouring tube at a flow rate of 0.5 - 2.0 L / s, and the injection pressure of the melt is stabilized between 0.01 - 0.03 MPa.

[0011] Preferably, in the S6, the moving speed of the mold is controlled between 3 - 5 m / min to ensure that the melt can be filled quickly and evenly in the mold, avoiding the generation of bubbles or inclusions.

[0012] Preferably, in the S7, the solidification process proceeds from the outside to the inside, and the mold continuously absorbs heat, and the temperature gradually rises to 300 - 500 °C during this process. In the S9, rapid cooling is carried out by strong water cooling at 50 - 100 L / (min·m²).

[0013] The present invention also provides a dynamic module traction horizontal continuous casting device for magnesium alloy rods, including: A dynamic module, made of H13 steel and subjected to surface nitriding treatment. The dynamic module is composed of multiple heat-resistant alloy molds. The wall thickness of the mold is 20 - 50 mm, and the initial temperature is controlled between 150 - 200 °C to ensure sufficient strength and stability of the mold in a high-temperature environment. Cooling channels are provided on the mold surface. The dynamic module structure design, each mold unit is connected by a self-locking structure to ensure that the mold cavity is closed during the casting process, and the melt can be stably held in the mold after flushing into the mold cavity without leakage of the melt due to pressure; after solidification, the self-locking mechanism of the mold can be conveniently opened to facilitate the separation of the module from the casting rod. The dynamic traction mechanism is used to achieve synchronous movement of the mold and the casting. The dynamic traction mechanism adopts a chain drive driven by a servo motor. The dynamic traction mechanism provides sufficient power to ensure the smooth advancement of the mold and provide sufficient traction for the magnesium alloy bar that has formed a solid shell to prevent defects during the casting process. The dynamic module unit water cooling system, after solidification is completed, the mold temperature will rise to 300~500℃, and the mold temperature will be detected in real time by the mold temperature detection system. When the mold temperature is higher than 250℃, it enters the controllable water cooling zone, and the water cooling system forcefully cools the mold to about 200℃. During continuous production, the mold temperature is maintained between 200~250℃.

[0014] The melt conveying mechanism is used to convey the melt and ensure that the temperature of the melt is kept above 650°C during the transmission process to avoid the melt solidification due to too low temperature; The casting tube is equipped with a heating mechanism to ensure that the melt does not solidify due to cooling before entering the mold. A sealing gap is set between the inner cavity of the casting tube and the mold; The cooling mechanism is arranged inside the mold. The cooling mechanism quickly removes the heat from the surface of the casting through forced cooling to ensure rapid solidification of the casting. The cooling mechanism includes a water cooling zone that uses a strong spray cooling device to quickly cool the magnesium alloy bar that has begun to solidify to below 150°C. The cutting mechanism is used to cut the formed magnesium rod to a fixed length; Packaging mechanism: used to collect the cut magnesium alloy bars and bundle and pack them.

[0015] Compared with the prior art, the present invention provides a dynamic die-pulling horizontal continuous casting process and device for magnesium alloy bars, which has the following beneficial effects: Through the dynamic module closed solidification technology, the magnesium alloy melt quickly forms a dense solidified shell when it contacts the mold wall, completely isolating it from air contact, and fundamentally avoiding the problem of magnesium alloy oxidation. Compared with traditional processes, the use of greenhouse gases such as SF6 is completely eliminated, reducing greenhouse gas emissions by more than 90%, meeting international environmental standards, and the melt is in a closed environment throughout the process, without the need to add additional protective gas, significantly reducing the risk of environmental pollution in the production process, and promoting the transformation of the magnesium alloy industry to green manufacturing; Through the precise matching of the synchronous movement of the dynamic module and the melt pouring speed, the continuous casting of magnesium alloy bars is realized to meet the needs of industrial large-scale production; The dynamic module is made of H13 nitriding steel and hydraulic push-out demoulding design (thrust force 5-20kN), which significantly reduces the adhesion between magnesium alloy and the mold. It can be directly used for precision machining without secondary polishing, greatly reducing rework costs. The integrated design of the dynamic module integrates the traction power into the module motion system, eliminating the traditional external traction mechanism, and cooperates with the circulating water cooling mechanism to reduce energy consumption. In addition, the automated cut-to-length cutting and packaging process reduces manual intervention, saves labor costs, and significantly improves the company's market competitiveness; (4) The combination of the dynamic module traction system and the melt delivery system ensures smooth melt flow during the casting process, excellent casting surface quality, and effectively avoids the generation of internal and external defects in the casting. By optimizing the design of the mold cooling and water cooling zone, the casting surface can be evenly cooled and solidified quickly, preventing defects such as cracks and shrinkage holes caused by uneven cooling; (5) The automated cutting and packaging system reduces manual intervention and improves the operating efficiency of the production line, while ensuring the precise cutting and high-quality packaging of magnesium alloy bars. The device is suitable for the production of magnesium alloy bars of various specifications and can adjust the parameters of the mold and traction system according to different sizes and requirements, with strong adaptability. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a flow chart of a dynamic die-group traction horizontal continuous casting process for magnesium alloy bars proposed by the present invention; Figure 2 This is a schematic diagram of the three-dimensional structure of a dynamic module traction horizontal continuous casting device for magnesium alloy bars proposed in the present invention. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0018] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0019] Reference Figure 1 A dynamic die-pulling horizontal continuous casting process for magnesium alloy bars comprises the following steps: S1. Melting and Refining of Magnesium Alloy: The raw materials of magnesium alloy are heated in a closed melting furnace; during the melting process, other alloying elements are added to improve the fluidity and oxidation resistance of the alloy or enhance certain specific properties. S2. Automatic Liquid Transfer: The melt is transported to a holding ladle through a sealed metering pump liquid transfer system. The ladle is equipped with a liquid level probe to detect the liquid level in real time. The liquid transfer stops when the liquid level rises to the upper limit. When the continuous casting production starts and the liquid level drops to the lower limit, the liquid transfer pump starts automatically to achieve continuous production, and the liquid level fluctuation range is controlled within 50 mm. S3. Quantitative Casting: The melt in the ladle is continuously injected into the continuous casting mold cavity through a quantitative casting valve that can precisely control the opening and closing action and a casting tube with a diameter smaller than the inner diameter of the mold cavity. There is a 600-mm height difference between the melt level in the ladle and the casting tube orifice. The melt can maintain a flow rate of about 20 m / min under its own pressure when injected into the casting tube. The quantitative casting valve adopts a cone valve structure made of special heat-resistant steel, and the pouring system injects into the casting tube to ensure smooth flow. S4. Dynamic Mold Unit Start-up: The mold is preheated to about 150 °C, and a mold release agent is sprayed. The self-locking structure of the dynamic mold unit not only ensures the stability of the mold cavity during casting and prevents the mold from opening and leaking due to liquid pressure, but also enables the two sets of molds to move synchronously. The lower mold is used as the driving force to drive the entire mold to move synchronously.

[0020] S5. Melt Filling: When the melt enters the mold cavity, the mold drives the cast bar to move synchronously at a speed of 3 - 6 m / min. S6. Synchronous Solidification: After the melt contacts the mold wall, due to the heat conduction ability of the mold, the melt is rapidly cooled and immediately starts to solidify, forming a closed shell layer to prevent oxidation when contacting the air. S7. Active Demolding: When the surface layer of the cast bar solidifies to a strength of ≥50 MPa, the self-locking mechanism of the mold disengages, and the mold and the cast bar are actively separated to start demolding. S8. Forced Cooling: The core area of the cast bar that has not fully solidified is rapidly cooled through powerful water cooling. S9. Mold Cooling and Reuse: After demolding, the mold is generally at about 300 - 500 °C and needs to be cooled down forcibly through a water cooling zone to 150 - 200 °C. Then, it enters the casting zone under the traction of a chain structure, and the self-locking mechanism is connected to form a mold cavity to receive the melt injection for the next casting, repeating the cycle. In this embodiment, in S10, the specific steps are as follows: S1001. Fixed-length Cutting: The length of the cast bar needs to be accurately measured and cut. The common length range of the cast bar is 1 - 6 m, and it is cut according to the subsequent processing requirements. S1002, Surface grinding and coding: There may be some tiny flaws or oxide layers on the surface of the cast rod, so it is necessary to perform surface grinding to ensure its smoothness and appearance; S1003, Packaging and warehousing: The cast bars after grinding and coding will be finally packaged for storage or transportation to customers.

[0021] In this embodiment, in S1, a protective atmosphere is used during the smelting process to prevent oxidation of the magnesium alloy. The protective atmosphere includes but is not limited to argon. The flow rate of the protective atmosphere is maintained at 10-15 L / min, and the temperature is controlled between 650-680°C to ensure that the alloy composition is uniform and does not over-oxidize.

[0022] In this embodiment, in S2, other alloy elements include but are not limited to aluminum, zinc, manganese and rare earth elements.

[0023] In this embodiment, in S3, the temperature of the insulation ladle is controlled at 640-700°C to ensure that the melt will not solidify prematurely due to too low temperature during the transportation process.

[0024] In this embodiment, in S4, the melt is injected into the pouring pipe at a flow rate of 0.5-2.0 L / s, and the injection pressure of the melt is stabilized between 0.01-0.03 MPa.

[0025] In this embodiment, in S6, the movement speed of the mold is controlled between 3-5 m / min to ensure that the melt can be quickly and evenly filled in the mold to avoid the generation of bubbles or inclusions.

[0026] In this embodiment, in S7, the solidification process is carried out from the outside to the inside, the mold continuously absorbs heat, and the temperature gradually rises to 450-500°C during this process. In S9, rapid cooling is performed by strong water cooling at 50-100L / (min·m²).

[0027] The present invention also provides a dynamic die-group traction horizontal continuous casting device for magnesium alloy bars, comprising: The dynamic module is made of H13 steel and surface nitrided. The dynamic module consists of multiple heat-resistant alloy molds. The wall thickness of the mold is 20-50mm, and the initial temperature is controlled between 150-200℃ to ensure that the mold has sufficient strength and stability in a high temperature environment. A cooling channel is set on the mold surface; Dynamic module structure design, each mold unit is connected by a self-locking structure to ensure that the mold cavity is closed during the casting process. After the melt rushes into the mold cavity, it can be stably maintained in the mold without causing melt leakage due to pressure. After solidification, the mold self-locking mechanism can be easily opened to facilitate the module to separate from the casting rod. Dynamic traction mechanism, which is used to achieve the synchronous movement of the mold and the casting. The dynamic traction mechanism adopts a chain drive driven by a servo motor; the dynamic traction mechanism provides sufficient power to ensure the stable advancement of the mold and at the same time provide sufficient traction for the magnesium alloy bar that has formed a solid shell to prevent defects during the casting process; Water cooling system for the dynamic module unit. After solidification, the temperature of the mold will rise to 300 - 500 °C. The mold temperature is detected in real time through the mold temperature detection system. When the mold temperature is higher than 250 °C, it enters the controllable water cooling area, and the water cooling system cools the mold to about 200 °C by forced cooling. During continuous production, the mold temperature is maintained between 200 - 250 °C.

[0028] Melt delivery mechanism, which is used to deliver the melt and ensure that the temperature of the melt is maintained above 650 °C during the transmission process to avoid solidification of the melt due to too low temperature; Casting tube, which is provided with a heating mechanism inside to ensure that the melt does not solidify due to cooling before entering the mold. There is a sealing gap between the inner cavity of the casting tube and the mold; Cooling mechanism, which is arranged inside the mold. The cooling mechanism quickly takes away the heat from the surface of the casting through forced cooling to ensure the rapid solidification of the casting. The cooling mechanism includes a strong spray cooling device in the water cooling area, which quickly cools the magnesium alloy bar that has started to solidify to below 150 °C; Cutting mechanism, which performs fixed-length cutting on the formed magnesium bar; Packaging mechanism: used to collect the cut magnesium alloy bars and perform bundling and packaging.

[0029] In this embodiment, during use, first, the raw materials of the magnesium alloy (such as magnesium ingots and alloying elements) are melted to generate a magnesium alloy melt. The melt enters the casting tube through a conveying mechanism while maintaining a temperature (generally above 680 °C). The magnesium alloy melt is transported to the casting tube through a conveying pipeline. Through the casting tube, the flow rate of the melt is precisely controlled by a magnesium alloy melt plunger valve to ensure that the melt steadily enters the mold. To prevent the melt from cooling and solidifying during transportation, a heating device is provided inside the casting tube to ensure that the melt temperature is maintained above 680 °C, avoiding crust formation or poor flow. The device uses specially designed high-temperature and corrosion-resistant molds, usually made of H13 steel or other highly wear-resistant materials. The inner surface of the mold is designed with cooling channels to quickly remove heat through water cooling or air cooling methods to ensure that the melt quickly solidifies to form a casting. The mold and the casting move forward synchronously through a dynamic traction mechanism (such as a chain or sprocket driven by a servo motor). This mechanism can precisely control the forward speed of the mold, matching the melt cooling speed and the casting solidification speed to ensure that the casting always maintains a stable shape. The speed of the traction mechanism is closely coordinated with the progress of melt cooling and solidification. Through servo motor adjustment, the uniformity of the traction speed is controlled to ensure that the casting is not stretched, broken, or defective during the cooling process; As the casting solidifies, the traction mechanism pulls the casting forward while maintaining stable contact between the casting and the mold to avoid uneven stress or deformation of the casting due to incomplete solidification. The mold is internally provided with cooling channels, and the water cooling mechanism removes the heat from the surface of the mold through methods such as spraying and circulating water flow to quickly cool the surface of the casting. The design of the cooling mechanism can precisely control the cooling rate, adjust the cooling amount according to the size, material, and shape of the casting to ensure uniform surface cooling and prevent defects such as cracks or pores caused by uneven cooling.

[0030] Solidification process: As the magnesium alloy melt flows forward along the mold, a solid shell layer gradually forms on the surface of the melt. The thickness and structure of this shell layer depend on the coordination of the cooling rate and the drawing speed. Excessive cooling will cause the shell layer to be too hard, while too slow cooling may generate internal stress. The cooling process is precisely managed through the cooling water flow and the temperature control mechanism of the mold to ensure that the casting solidifies stably and uniformly. When the magnesium alloy bar solidifies in the mold and is drawn out, it will be cut to a specified length by an automated cutting device. When the casting reaches the predetermined length, the cutting machine activates the precise cutting function to cut the casting into bars of the specified length. The cut magnesium alloy bars will be automatically fed into the collection area, and the collection mechanism transports the castings to the subsequent processing area through a conveyor belt or a conveying mechanism. According to requirements, the collection area can be designed with an automated bundling and packaging mechanism to reduce manual operations and improve production efficiency. The entire cutting, collection, and packaging process is automated to ensure the stable operation of the production line, reduce the possibility of human intervention, and further improve production efficiency and the quality of finished products. The device is equipped with multiple sensors and temperature monitoring devices to continuously monitor parameters such as the melt temperature, mold temperature, and drawing speed, ensuring that the entire casting process operates at the optimal working state at all times.

[0031] The standard parts used in the present invention can all be purchased from the market. The special-shaped parts can be customized according to the descriptions in the specification and the drawings. The specific connection methods of each part all adopt conventional means such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts, and equipment all adopt conventional models in the prior art, and the circuit connection adopts the conventional connection method in the prior art, which will not be elaborated here.

Claims

1. A dynamic module traction horizontal continuous casting process for magnesium alloy bars, characterized in that, It includes the following steps: S1. Melting and refining of magnesium alloy: The magnesium alloy raw materials are heated in a closed melting furnace; during the melting process, other alloying elements are added to improve the fluidity and oxidation resistance of the alloy or to enhance certain specific properties; S2. Automatic liquid transfer: The melt is transported to the holding ladle through a sealed metering pump liquid transfer system. The ladle is equipped with a liquid level probe to detect the liquid level in real time. The liquid transfer stops when the liquid transfer level reaches the upper limit. When the continuous casting production starts and the liquid level drops to the lower limit, the liquid transfer pump automatically starts to achieve continuous production, and the liquid level fluctuation range is controlled within 50 mm; S3. Quantitative casting: The melt in the ladle is continuously injected into the continuous casting mold cavity through a quantitative casting valve that can precisely control the opening and closing action and a casting tube with a diameter smaller than the inner diameter of the mold cavity. There is a 600 mm height difference between the melt surface in the ladle and the casting tube orifice. The melt can maintain a flow rate of about 20 m / min under its own pressure and is injected into the casting tube. The quantitative casting valve adopts a cone valve structure made of special heat-resistant steel, and the pouring system injects into the casting tube to ensure smooth flow; S4. Dynamic mold unit startup: The mold is preheated to about 150 °C, and a release agent is sprayed. The self-locking structure of the dynamic mold unit not only ensures the stability of the mold cavity during casting and prevents the mold from opening and leaking due to liquid pressure, but also enables the two sets of molds to move synchronously. The lower mold is used as the driving force to drive the overall mold to move synchronously; S5. Melt filling: When the melt enters the mold cavity, the mold drives the cast rod to move synchronously at a speed of 3 - 6 m / min; S6. Synchronous solidification: After the melt contacts the mold wall, due to the heat conduction ability of the mold, the melt is rapidly cooled and immediately starts to solidify, forming a closed shell layer to prevent oxidation when contacting the air; S7. Active demolding: When the surface of the cast rod solidifies to a strength of ≥50 MPa, the self-locking mechanism of the mold disengages, and the mold and the cast rod are actively separated to start demolding; S8. Forced cooling: The central region of the cast rod that is not completely solidified is rapidly cooled through strong water cooling; S9. Mold cooling and reuse: After demolding, the mold is generally at about 300 - 500 °C and needs to be forced to cool down through a water cooling zone to 150 - 200 °C. Then, under the traction of the chain structure, it enters the casting zone, and the self-locking mechanism is connected to form a mold cavity to receive the melt injection for the next casting, repeating the cycle; S10. Cast rod processing and subsequent processing: The formed cast rod is subjected to subsequent processing.

2. The dynamic module traction horizontal continuous casting process of the magnesium alloy bar according to claim 1, characterized in that, In the above S10, the specific steps are as follows: S1001. Fixed-length cutting: The length of the cast rod needs to be accurately measured and cut. The common length range of the cast rod is 1 - 6 m, and it is cut according to the subsequent processing requirements; S1002. Surface grinding and coding: There may be some minor defects or oxide layers on the surface of the cast rod, so surface grinding treatment is required to ensure its smoothness and appearance; S1003. Packaging and warehousing: The ground and coded cast rods will ultimately be packaged for warehousing storage or transportation to customers.

3. The dynamic module traction horizontal continuous casting process of the magnesium alloy bar according to claim 1, characterized in that, In S1, a protective atmosphere is used during the smelting process to prevent oxidation of the magnesium alloy. The protective atmosphere includes but is not limited to argon. The flow rate of the protective atmosphere is maintained at 10-15 L / min, and the temperature is controlled between 650-680° C. to ensure that the alloy composition is uniform and does not over-oxidize.

4. The dynamic module traction horizontal continuous casting process of the magnesium alloy bar according to claim 1, characterized in that, In S2, other alloy elements include but are not limited to aluminum, zinc, manganese and rare earth elements.

5. The dynamic module traction horizontal continuous casting process of the magnesium alloy bar according to claim 1, characterized in that, In S3, the temperature of the insulation ladle is controlled at 650-700°C to ensure that the melt will not solidify prematurely due to low temperature during transportation.

6. The dynamic module traction horizontal continuous casting process for the magnesium alloy bar according to claim 1, characterized in that, In S4, the melt is injected into the pouring pipe at a flow rate of 0.5-2.0 L / s, and the injection pressure of the melt is stabilized between 0.01-0.03 MPa.

7. The dynamic module traction horizontal continuous casting process of the magnesium alloy bar according to claim 1, characterized in that, In S6, the movement speed of the mold is controlled between 3-6 m / min to ensure that the melt can be quickly and evenly filled in the mold to avoid the generation of bubbles or inclusions.

8. The dynamic module traction horizontal continuous casting process of the magnesium alloy bar according to claim 1, characterized in that, In the S7, the solidification process is carried out from the outside to the inside, the mold continuously absorbs heat, and the temperature gradually rises to 300-500°C during this process. In the S9, rapid cooling is performed through strong water cooling at 50-100L / (min·m²).

9. A dynamic module traction horizontal continuous casting device for a magnesium alloy bar, characterized in that, include: The dynamic module is made of H13 steel and surface nitrided. The dynamic module consists of multiple heat-resistant alloy molds. The wall thickness of the mold is 20-50mm, and the initial temperature is controlled between 150-200℃ to ensure that the mold has sufficient strength and stability in a high temperature environment. A cooling channel is set on the mold surface; Dynamic module structure design, each mold unit is connected by a self-locking structure to ensure that the mold cavity is closed during the casting process. After the melt rushes into the mold cavity, it can be stably maintained in the mold without causing melt leakage due to pressure. After solidification, the mold self-locking mechanism can be easily opened to facilitate the module to separate from the casting rod. The dynamic traction mechanism is used to achieve synchronous movement of the mold and the casting. The dynamic traction mechanism adopts a chain drive driven by a servo motor. The dynamic traction mechanism provides sufficient power to ensure the smooth advancement of the mold and provide sufficient traction for the magnesium alloy bar that has formed a solid shell to prevent defects during the casting process. Dynamic module unit water cooling system, after solidification, the mold temperature will rise to 300~500℃, and the mold temperature will be detected in real time by the mold temperature detection system. When the mold temperature is higher than 250℃, it will enter the controllable water cooling zone, and the water cooling system will force the mold to cool to about 200℃. During continuous production, the mold temperature is maintained between 200~250℃; The melt conveying mechanism is used to convey the melt and ensure that the temperature of the melt is kept above 650°C during the transmission process to avoid the melt solidification due to too low temperature; The casting tube is equipped with a heating mechanism to ensure that the melt does not solidify due to cooling before entering the mold. A sealing gap is set between the inner cavity of the casting tube and the mold; The cooling mechanism is arranged inside the mold. The cooling mechanism quickly removes the heat from the surface of the casting through forced cooling to ensure rapid solidification of the casting. The cooling mechanism includes a water cooling zone that uses a strong spray cooling device to quickly cool the magnesium alloy bar that has begun to solidify to below 150°C. Cutting mechanism, which performs fixed-length cutting on the formed magnesium rods; Packaging mechanism: used to collect the cut magnesium alloy rods and perform bundling and packaging.

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