Automobile magnesium alloy seat framework and die-casting processing device thereof

Abstract

This invention relates to the field of automotive component die casting technology, specifically disclosing a die casting processing device for automotive magnesium alloy seats. The device includes a side cylinder, a guide rod, a fixed module, a liquid injection block, a gas exhaust mechanism, a cavity on the fixed module that matches the shape of the seat frame, a receiving groove on the liquid injection block, a guide hole on the receiving groove, and a drive mechanism for driving the fixed module to reciprocate along the length of the guide rod. The guide rod is fixedly connected to the side cylinder; the fixed module is slidably connected to the guide rod, and the receiving groove is located on the movement trajectory of the fixed module. The gas exhaust mechanism includes a filter plate, an exhaust groove on the liquid injection block, and gas exhaust components symmetrically arranged on both sides of the exhaust groove along its width. The filter plate is fixedly connected to the exhaust groove; the gas exhaust components include a guide groove and a guide section on the exhaust groove. This addresses the problem in existing technologies where there is a lack of active exhaust or pressurized gas-driving mechanisms, making it difficult to completely exhaust gas from deep cavities during high-speed die casting.

Description

Technical Field

[0001] This application relates to the field of automotive component die casting technology, specifically to an automotive magnesium alloy seat frame and its die casting processing device. Background Technology

[0002] Driven by the global automotive industry's goals of lightweighting and dual-carbon transformation, the requirements for weight reduction in new energy vehicles continue to rise. As a core load-bearing component of automotive seats, the weight of the seat frame directly impacts the vehicle's energy consumption and range. Traditional steel seat frames suffer from drawbacks such as a large number of parts, complex welding processes, and high overall weight. While conventional aluminum alloy frames achieve some weight reduction, they still fall short of meeting the extreme lightweighting requirements of high-end new energy vehicles. Magnesium alloy, as the lightest metal structural material in engineering applications, has become the preferred material for lightweight seat frames due to its high specific strength, high specific stiffness, excellent casting performance, and environmentally friendly and recyclable characteristics.

[0003] The mass production application of magnesium alloy seat frames still faces many technical bottlenecks: First, traditional designs rely on natural gas diffusion and pressure difference flow, lacking active exhaust or pressurized air-driving mechanisms, making it difficult to exhaust the gas in the deep cavity instantly during high-speed die casting; Second, existing exhaust channels are of fixed size and cannot respond in real time to changes in gas pressure and exhaust volume in the cavity during the die casting process, which limits the exhaust capacity during the active air extraction stage and increases the risk of molten metal backflow. Summary of the Invention

[0004] In order to solve the problems existing in the prior art, the purpose of this invention is to provide an automotive magnesium alloy seat frame and its die-casting processing device, so as to solve the problem that the prior art lacks an active exhaust or supercharged air drive mechanism, making it difficult to exhaust the gas in the deep cavity during high-speed die casting.

[0005] To achieve the above objectives, the present invention provides the following solution: A magnesium alloy car seat includes an integrally die-cast backrest frame, a seat chassis, and a connecting part. The backrest frame and the seat chassis are connected as a whole through the connecting part. All three are integrally die-cast structures made of the same magnesium alloy material, without additional welding and assembly processes. The inner side of the seat chassis is provided with integrally formed limiting holes and threaded holes. The backrest frame has an integrally formed lumbar support mounting groove inside. The headrest mounting position at the top of the backrest frame has an annular reinforcing rib die-cast.

[0006] Furthermore, the magnesium alloy composition by weight percentage is: Al 4.2~7.0%, Mn 0.15~0.5%, RE 0.20~2.50%, Y 0.01~1.5%, Ca 0.03~0.80%, Fe+Ni+Cu total content ≤0.01%, Zn ≤0.20%, with the balance being Mg, wherein the total weight percentage of RE+Y is ≥0.5%, and RE is a mixture of La and Ce rare earth elements.

[0007] The principles and advantages of this scheme are: 1. Compared with traditional steel frames, the number of parts is reduced by more than 80%, eliminating the cumbersome processes of stamping, welding, and multi-process assembly. The overall weight is reduced by more than 60% compared with steel frames of the same specifications. At the same time, integrated reinforcing ribs are set at key stress positions to avoid stress concentration at welding positions, which greatly improves the fatigue service life of the frame.

[0008] 2. Al primarily functions as a solid solution strengthening element; Mn refines the grain size and improves corrosion resistance; the addition of mixed rare earth elements (RE) and Y significantly refines the casting microstructure, forming high-temperature stable intermetallic compounds, thus enhancing the alloy's high-temperature strength and creep resistance; trace amounts of Ca further refine the microstructure and improve the alloy's oxidation resistance; strict control of the content of harmful impurity elements such as Fe, Ni, and Cu is crucial to ensuring the alloy's corrosion resistance. After die casting, the alloy exhibits a measured tensile strength ≥260MPa, yield strength ≥175MPa, and elongation ≥10.5%, fully meeting the collision safety standards for automotive seats and providing an ideal material basis for integrated die-cast lightweight frames.

[0009] This solution also provides a die-casting processing device for automotive magnesium alloy seat frames, including a side cylinder, a guide rod, a fixed module, a liquid injection block, a gas exhaust mechanism, a cavity on the fixed module that matches the shape of the seat frame, a receiving groove on the liquid injection block, a guide hole on the receiving groove, and a drive mechanism for driving the fixed module to reciprocate along the length direction of the guide rod; the guide rod is fixedly connected to the side cylinder; the fixed module is slidably connected to the guide rod, and the receiving groove is located on the movement trajectory of the fixed module; the gas exhaust mechanism includes a filter plate, an exhaust groove on the liquid injection block, and gas exhaust components symmetrically arranged on both sides of the exhaust groove along its width direction; the filter plate is fixedly connected to the exhaust groove; the gas exhaust components include a guide groove and a guide part on the exhaust groove; The gas section includes a piston cylinder, a piston block, an exhaust pipe, an intake pipe assembly, a long rod, a power unit for driving the piston block to reciprocate along the length of the piston cylinder, a drive unit for driving the long rod to reciprocate vertically, and several air guiding units equidistantly arranged along the length of the long rod. The piston cylinder is fixedly connected to the exhaust groove; the piston block is slidably connected to the piston cylinder; both the exhaust pipe and the intake pipe assembly are connected to the piston cylinder; the exhaust outlet of the exhaust pipe faces the exhaust groove, and the intake outlet of the intake pipe assembly faces the air guiding groove; the long rod is slidably connected to the air guiding groove; the air guiding unit includes an air guiding hole opened on the air guiding groove and an orifice adjustment plate for sealing the air guiding hole; the air guiding hole communicates with the receiving groove; the orifice adjustment plate is fixedly connected to the long rod and is in contact with the air guiding groove.

[0010] Furthermore, the air guiding unit also includes a spoiler fan blade; the spoiler fan blade is fixedly connected to the aperture adjustment plate.

[0011] Furthermore, the gas exhaust assembly also includes groove unblocking sections symmetrically arranged on both sides of the piston cylinder; the groove unblocking section includes a guide rod, a nut seat, a side block, a base plate, an unblocking brush, and a motion unit for driving the nut seat to reciprocate along the length of the guide rod; the guide rod is fixedly connected to the exhaust groove; the nut seat is slidably connected to the guide rod; the side block is fixedly connected to the nut seat; the base plate is connected to the side block; the unblocking brush is located at the connection between the gas guide groove and the exhaust groove, and the unblocking brush is fixedly connected to the base plate.

[0012] Furthermore, the groove unblocking section also includes an auxiliary unit; the auxiliary unit includes an auxiliary rod and an auxiliary component for driving the auxiliary rod to make vertical reciprocating motion; the auxiliary rod is slidably connected to the side block; and the base plate is fixedly connected to the auxiliary rod.

[0013] Furthermore, the intake pipe assembly includes intake pipes symmetrically arranged on both sides of the piston cylinder; the slot unblocking part also includes a linkage unit; the linkage unit includes a linkage pipe, a connecting rod, and a linkage hole assembly symmetrically opened on both sides of the linkage pipe; the linkage pipe is hinged to the intake pipe and communicates with the intake pipe; the two ends of the connecting rod are respectively hinged to the linkage pipe and the side block; the side block abuts against the linkage pipe.

[0014] Furthermore, the linkage hole group includes several linkage holes arranged at equal intervals; the linkage unit also includes a linkage rod and several arc-shaped blocks arranged at equal intervals along the length direction of the linkage rod; the linkage rod is fixedly connected to the exhaust groove; the arc-shaped blocks are fixedly connected to the linkage rod, and the arc-shaped blocks are located on the movement trajectory of the linkage holes.

[0015] Furthermore, the drive unit includes a drive shaft, a first gear, a rack, and a drive component for rotating the drive shaft; the drive shaft is rotatably connected to the exhaust groove; the first gear is fixedly connected to the drive shaft; the rack is fixedly connected to the long rod, and the rack meshes with the first gear.

[0016] Furthermore, the power unit includes a power shaft, a second gear, a cam, and a first spring; the power shaft is rotatably connected to the exhaust channel; the second gear and the cam are both fixedly connected to the power shaft; the second gear meshes with the first gear; the piston block abuts against the cam; and the two ends of the first spring are respectively connected to the piston cylinder and the piston block.

[0017] The principles and advantages of this scheme are: 1. The design of this scheme combines the "air guide hole-aperture adjustment plate-air guide unit" with the "exhaust groove-gas exhaust assembly". Instead of passively relying on air holes for exhaust, it sets up porous gas channels (air guide units) in specific areas and uses the movement of piston blocks to generate directional negative pressure (intake) or positive pressure (exhaust) at the inlet of the exhaust groove, which can actively extract or force out the gas in the cavity and gating (slot).

[0018] 2. Driven by the power unit, the piston cylinder continuously and stably removes accumulated gas and any residual paint fumes from the mold cavity through "intake" and "exhaust" cycles. This ensures that the molten metal can smoothly replace the air in the cavity during the filling process, significantly reducing the porosity inside the casting and surface porosity defects, and improving the density and mechanical properties of the casting. This is crucial for lightweight automotive seat frames with high performance requirements.

[0019] 3. The drive unit, through gear and rack transmission, drives the long rod and all the aperture adjustment plates fixed to it to move synchronously, achieving uniform adjustment of the aperture size of multiple vent holes in a row. At different stages of the die-casting process, such as the initial stage of alloy liquid injection, the filling period, and the pressurization and holding period, the rate and location of gas generation within the mold cavity may differ. This design allows operators or the control system to precisely adjust the opening size of the vent holes according to the program, thereby controlling the exhaust speed and flow rate to achieve optimal exhaust matching, enhancing the adaptability and controllability of the processing technology.

[0020] 4. The turbulent fan blades added to the aperture adjustment plate generate shear force as the gas flows through the gas guide groove. This firstly breaks the surface tension, thus helping the gas escape from the molten metal. Secondly, it optimizes the flow field, thereby fine-tuning the flow state at the molten metal front, which helps the gas front escape and avoids the generation of new bubbles from eddies.

[0021] 5. The added slot unblocking section (including unblocking brush) can periodically or in real time mechanically clean the key connecting parts of the exhaust slot and the air guide slot, effectively avoiding the problem of exhaust channel blockage caused by long-term or continuous production, ensuring the long-term working stability and reliability of the system, reducing downtime for cleaning, and improving production efficiency.

[0022] 6. When the unblocking section moves, the linkage tube swings via a connecting rod, and the linkage tube is connected to the suction tube. The linkage hole on the linkage tube opens and closes periodically with the arc-shaped block on the linkage rod during the swing, forming an intermittent negative pressure generator. This cleverly generates instantaneous suction at a nearby location (connected to the suction tube) while the unblocking action is in progress (potentially raising debris), immediately sucking away the debris and dust that has been unblocked, avoiding secondary pollution and blockage, and achieving integrated cleaning and dust removal.

[0023] 7. The filter plates are installed to significantly reduce the solid pollutant content of the discharged gas after it has passed through the filter plates. This not only benefits the workshop environment, but also reduces the burden on downstream environmental protection facilities (such as dust collectors and waste gas treatment devices) if the gas needs to be connected to the workshop's centralized treatment system, preventing damage or blockage of the treatment equipment caused by large particles. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of an embodiment of the die-casting processing device for automotive magnesium alloy seat frames according to the present invention.

[0025] Figure 2 for Figure 1 A schematic diagram of the internal structure of the liquid injection block exhaust channel and the air guide channel.

[0026] Figure 3 for Figure 2 Enlarged view of point A in the middle.

[0027] Figure 4 for Figure 2 Enlarged view of point B in the middle.

[0028] Figure 5 for Figure 2 A schematic diagram of the structure viewed from the right.

[0029] Figure 6 for Figure 5 A magnified view of point C in the middle. Detailed Implementation

[0030] The following detailed description illustrates the specific implementation method: The reference numerals in the accompanying drawings include: side cylinder 1, fixed module 2, liquid injection block 3, filter plate 4, exhaust groove 5, air guide groove 6, piston cylinder 7, piston block 18, exhaust pipe 9, intake pipe 10, long rod 11, air guide hole 12, orifice adjustment plate 13, fan blade 14, guide rod 15, nut seat 16, side block 17, bottom plate 18, unclogging brush 19, auxiliary rod 20, linkage pipe 21, connecting rod 22, linkage rod 23, arc block 24, drive shaft 25, first gear 26, rack 27, power shaft 28, second gear 29, cam 30, screw 31, linkage recess 32, T-block 33, guide tube 34, linkage rod 35, linkage hole 36.

[0031] Example 1

[0032] This embodiment discloses an automotive magnesium alloy seat frame, which adopts an integral die-cast structure, including an integrally die-cast backrest frame, a seat chassis, and a connecting part. The backrest frame and the seat chassis are connected as a whole through the connecting part. All three are integrally die-cast structures made of the same magnesium alloy, without additional welding assembly processes. The inner side of the seat chassis is provided with integrally formed limiting holes and threaded holes. The backrest frame has an integrally formed lumbar support mounting groove inside. The headrest mounting position at the top of the backrest frame has an annular reinforcing rib die-cast. The overall weight of the frame is only 2.8 kg, which is 62% lighter than traditional steel seat frames with the same performance. Its magnesium alloy composition by weight percentage is: Al 5.5%, Mn 0.3%, mixed rare earth RE 1.2%, Y 0.6%, Ca 0.4%, Fe+Ni+Cu total content 0.008%, Zn 0.15%, and the balance is Mg. The alloy has a tensile strength of 260 MPa, a yield strength of 175 MPa, and an elongation of 10.5%, which fully meets the collision safety standards for automotive seats.

[0033] The die-casting process is as follows: S1: Melt and refine the magnesium alloy raw materials in the above proportions to obtain qualified magnesium alloy melt; S2: The mold is closed and the gas exhaust mechanism is activated. First, the power unit drives the piston block to pump air back and forth several times. The residual air in the cavity and exhaust system is actively and quickly extracted through the suction pipe group and the air guide groove to form a preliminary negative pressure environment. S3: Injection filling; The magnesium alloy melt is injected into the mold cavity at high speed; In the early stage of filling, the vent is kept in the maximum open state, and the piston pumping unit works continuously or intermittently to expel the gas in the mold cavity. S4: Dynamically adjust the exhaust; As the front end of the melt gradually approaches the exhaust area, the long rod is controlled to move down through the drive unit, which drives the orifice adjustment plate to gradually block part of the vent holes and reduce the exhaust diameter; This process can be adjusted in real time according to the preset program or sensor feedback, while ensuring effective exhaust and accurately controlling the pressure at the front end of the molten metal to prevent it from entering or backflowing and blocking the exhaust tank too early. S5: Filling End and Pressure Holding; After the cavity is completely filled, the drive unit moves the long rod to the position where all air vents are completely closed, and the gas exhaust mechanism stops working; then pressure holding is performed to eliminate shrinkage. S6: Mold opening and part removal; obtaining a dense, non-porous, one-piece molded magnesium alloy seat frame; the frame is an integral die-cast structure, with no welding connections between the backrest frame, seat chassis and connecting parts; actual measurement shows that the finished frame weighs only 2.8kg, which is more than 60% lighter than traditional steel frames with the same performance, and the mechanical properties fully meet the standards.

[0034] Example 2

[0035] A die-casting processing device for automotive magnesium alloy seat frames, basically as shown in the attached figure. Figure 1 , 2 As shown in Figures 3, 4, 5, and 6: The system includes a side cylinder 1, a guide rod, a fixed module 2, an injection block 3, a gas exhaust mechanism, a cavity on the fixed module 2 that matches the shape of the seat frame, a receiving groove on the injection block 3, a guide hole on the receiving groove, and a drive mechanism for driving the fixed module 2 to reciprocate along the length of the guide rod; the guide rod is fixedly connected to the inner wall of the side cylinder 1; the fixed module 2 is slidably connected to the guide rod, and the receiving groove is located on the movement trajectory of the fixed module 2; a guide tube 34 is installed at the guide hole; the gas exhaust mechanism includes a filter plate 4, an exhaust groove 5 on the top of the injection block 3, and gas exhaust components symmetrically arranged on both sides of the exhaust groove 5 along its width; the filter plate 4 is fixedly connected to the exhaust groove 5; the gas exhaust components include a guide groove 6 on the exhaust groove 5 and a guide section; the guide section includes a piston cylinder 7, a piston block 18, an exhaust pipe 9, a set of suction pipes 10, and a long rod 11 for driving the piston block 18 along the length of the piston cylinder 7. The system includes a power unit for reciprocating motion along its length, a drive unit for driving a long rod 11 to reciprocate vertically, and several air guiding units equidistantly arranged along the length of the long rod 11. A piston cylinder 7 is fixedly connected to an exhaust groove 5. A piston block 18 is slidably connected to the piston cylinder 7. Both an exhaust pipe 9 and an intake pipe 10 are connected to the piston cylinder 7. The exhaust port of the exhaust pipe 9 faces the exhaust groove 5, and the intake port of the intake pipe 10 faces the air guiding groove 6. The long rod 11 is slidably connected to the air guiding groove 6. Each air guiding unit includes an air guiding hole 12 opened on the air guiding groove 6 and an aperture adjustment plate 13 for sealing the air guiding hole 12. The air guiding hole 12 communicates with a receiving groove. The aperture adjustment plate 13 is fixedly connected to the long rod 11 and is in contact with the air guiding groove 6. The intake pipe 10 is equipped with a first one-way valve for unidirectional gas flow from the intake pipe 10 to the piston cylinder 7. The exhaust pipe 9 is equipped with a second one-way valve for unidirectional gas flow from the piston cylinder 7 to the exhaust pipe 9.

[0036] The air guiding unit also includes a spoiler fan blade 14; the spoiler fan blade 14 is fixedly connected to the aperture adjustment plate 13.

[0037] The gas exhaust assembly also includes groove unblocking sections symmetrically arranged on both sides of the piston cylinder 7; the groove unblocking section includes a guide rod 15, a nut seat 16, a side block 17, a base plate 18, an unblocking brush 19, and a motion unit for driving the nut seat 16 to reciprocate along the length of the guide rod 15; the guide rod 15 is fixedly connected to the exhaust groove 5; the nut seat 16 is slidably connected to the guide rod 15; the side block 17 is fixedly connected to the nut seat 16; the base plate 18 is connected to the side block 17; the unblocking brush 19 is located at the communication point between the gas guide groove 6 and the exhaust groove 5, and the unblocking brush 19 is fixedly connected to the base plate 18.

[0038] The groove unblocking section also includes an auxiliary unit; the auxiliary unit includes an auxiliary rod 20 and an auxiliary component for driving the auxiliary rod 20 to make vertical reciprocating motion; the auxiliary rod 20 is slidably connected to the side block 17; the base plate 18 is fixedly connected to the auxiliary rod 20.

[0039] The suction pipe 10 group includes suction pipes 10 symmetrically arranged on both sides of the piston cylinder 7; the groove unblocking part also includes a linkage unit; the linkage unit includes a linkage pipe 21, a connecting rod 22, and a linkage hole 36 group symmetrically opened on both sides of the linkage pipe 21; the linkage pipe 21 is hinged to the suction pipe 10 and the linkage pipe 21 communicates with the suction pipe 10; the two ends of the connecting rod 22 are respectively hinged to the linkage pipe 21 and the side block 17; the side block 17 abuts against the linkage pipe 21.

[0040] The linkage hole group 36 includes several linkage holes 36 equidistantly arranged; the linkage unit also includes a linkage rod 23 and several arc-shaped blocks 24 equidistantly arranged along the length direction of the linkage rod 23; the linkage rod 23 is fixedly connected to the exhaust groove 5; the arc-shaped blocks 24 are fixedly connected to the linkage rod 23, and the arc-shaped blocks 24 are located on the movement trajectory of the linkage hole 36; the ends of the arc-shaped blocks 24 near the linkage pipe 21 gradually decrease in size from bottom to top; during the rotation of the linkage hole 36, the arc-shaped blocks 24 can make relative movements within the linkage hole 36.

[0041] The drive unit includes a drive shaft 25, a first gear 26, a rack 27, and a drive component for rotating the drive shaft 25; the drive shaft 25 is rotatably connected to the exhaust groove 5; the first gear 26 is fixedly connected to the drive shaft 25; the rack 27 is fixedly connected to the long rod 11, and the rack 27 meshes with the first gear 26.

[0042] The power unit includes a power shaft 28, a second gear 29, a cam 30, and a first spring; the power shaft 28 is rotatably connected to the exhaust groove 5; the second gear 29 and the cam 30 are both fixedly connected to the power shaft 28; the second gear 29 meshes with the first gear 26; the piston block 18 abuts against the cam 30; and the two ends of the first spring are respectively connected to the piston cylinder 7 and the piston block 18.

[0043] The motion unit is a screw 31; the screw 31 is fixedly connected to the drive shaft 25 and rotatably connected to the exhaust groove 5; the nut seat 16 is threadedly connected to the screw 31.

[0044] It also includes a linkage component; the linkage component includes a linkage recess 32, a T-shaped block 33, and a second spring; the linkage recess 32 is fixedly connected to the exhaust groove 5; the T-shaped block 33 is slidably connected to the linkage recess 32, and the T-shaped block 33 abuts against the cam 30; the two ends of the second spring are respectively connected to the T-shaped block 33 and the linkage recess 32; the T-shaped block 33 abuts against the auxiliary rod 20; the auxiliary component is a third spring; the two ends of the third spring are respectively connected to the auxiliary rod 20 and the side block 17.

[0045] The driving component includes a drive servo motor and a chamber opened in the injection block 3; the drive servo motor is fixedly connected to the chamber; the drive shaft 25 is rotatably connected to the chamber, and the drive shaft 25 is fixedly connected to the output shaft of the drive servo motor.

[0046] Specific implementation process: Through the coordinated action of the fixed module 2 and the injection block 3, molten metal introduced into the mold cavity via the conduit 34 can be die-cast and formed. During the die-casting of the seat frame, the output shaft of the drive servo motor drives the drive shaft 25 to rotate. During the rotation of the drive shaft 25, the drive shaft 25 drives the power shaft 28 to rotate through the meshing of the first gear 26 and the second gear 29. During the rotation of the power shaft 28, the cam 30 rotates synchronously. During the rotation of the cam 30, the piston block 18, under the combined action of the cam 30 and the first spring, can reciprocate along the length direction of the piston cylinder 7.

[0047] During operation, the piston cylinder 7 continuously and stably removes accumulated gas and any residual paint fumes from the mold cavity through "inhalation" and "exhaust" cycles. This ensures that the molten metal can smoothly replace the air in the cavity during the filling process, significantly reducing the porosity inside the casting and surface porosity defects, and improving the density and mechanical properties of the casting. This is crucial for lightweight automotive seat frames with high performance requirements.

[0048] During the rotation of the first gear 26, the first gear 26 meshes with the rack 27, which in turn drives the long rod 11 to perform a vertical reciprocating motion. During the movement of the long rod 11, all the aperture adjustment plates 13 fixed to it move synchronously, achieving uniform adjustment of the aperture size of a row of multiple vent holes 12. In different stages of the die-casting process, such as the initial stage of alloy liquid injection, the filling period, and the pressurization and holding period, the rate and location of gas generation in the mold cavity may be different. This design allows the operator or control system to precisely adjust the opening size of the vent holes 12 according to the program, thereby controlling the exhaust speed and flow rate to achieve the best exhaust matching effect, enhancing the adaptability and controllability of the processing technology.

[0049] The purpose of filter plate 4 is to significantly reduce the solid pollutant content of the discharged gas after it has been treated by filter plate 4. This not only benefits the workshop environment, but also reduces the burden on downstream environmental protection facilities (such as dust collectors and waste gas treatment devices) if the gas needs to be connected to the workshop's centralized treatment system, and avoids damage or blockage of the treatment equipment caused by large particles.

[0050] Therefore, the combination of "air guide hole 12-aperture adjustment plate 13-air guide unit" and "exhaust groove 5-gas exhaust assembly" in this design does not passively rely on air holes for exhaust, but sets up porous gas channels (air guide units) in specific areas, and uses the movement of piston block 18 to generate directional negative pressure (inhalation) or positive pressure (exhaust) at the inlet of exhaust groove 5, which can actively extract or expel the gas in the cavity and gating (slot).

[0051] During the movement of the aperture adjustment plate 13, the turbulent fan blades 14 added to the aperture adjustment plate 13 generate shear force when the gas flows through the gas guide groove 6. This firstly breaks the surface tension, thus helping the gas escape from the molten metal. Secondly, it optimizes the flow field, thereby fine-tuning the flow state at the metal liquid front, which helps the gas front escape and avoids the generation of new bubbles in the eddies.

[0052] During the rotation of the drive shaft 25, the screw 31 rotates synchronously. During the rotation of the screw 31, the nut seat 16 can reciprocate along the length of the guide rod 15. During the movement of the nut seat 16, the nut seat 16 can drive the unclogging brush 19 to perform a synchronous lateral reciprocating motion via the side block 17. During the lateral reciprocating motion of the unclogging brush 19, the rotation of the cam 30 causes the T-block 33 to perform a vertical reciprocating motion under the combined action of the cam 30 and the second spring. During the vertical reciprocating motion of the T-block 33, the auxiliary rod 20, under the combined action of the T-block 33 and the third spring, can drive the unclogging brush 19 to perform a vertical reciprocating motion via the base plate 18. Therefore, the unclogging brush 19 can perform both lateral and vertical reciprocating motions simultaneously.

[0053] By using the horizontal and vertical movements of the unblocking brush 19, the critical connecting parts of the exhaust channel 5 and the air guide channel 6 can be mechanically cleaned periodically or in real time. This effectively avoids the problem of exhaust channel blockage caused by long-term or continuous production, ensures the long-term working stability and reliability of the system, reduces downtime for cleaning, and improves production efficiency.

[0054] During the movement of side block 17, the side block 17, through the action of connecting rod 22, causes the connecting rod 22 to swing the linkage tube 21. During the swing of the linkage tube 21, the linkage hole 36 on the linkage tube 21 will periodically open and close with the arc-shaped block 24 on the linkage rod 23, forming an intermittent negative pressure generator. That is, while the unblocking action is in progress (which may stir up debris), an instantaneous suction force is generated at the adjacent position (connected to the suction tube 10), which can immediately suck away the debris and dust that have been unblocked, avoiding secondary pollution and blockage, and realizing the integration of cleaning and dust removal.

[0055] Furthermore, during the swing of the linkage pipe 21, the air intake range of the linkage pipe 21 can be expanded, thereby accelerating the suction speed of the gas in the air guide groove 6 by the linkage pipe 21, which further enhances the effect of the linkage pipe 21.

[0056] In summary, this invention uses a single servo motor as the core drive source and integrates three core functions—active adjustable exhaust, channel self-cleaning and unblocking, and negative pressure linkage for cleaning and exhaust—through multiple mechanical transmission paths such as gear meshing and screw 31 transmission. It not only constructs a stable active intake-exhaust cycle through the reciprocating motion of the piston, but also synchronously adjusts the diameter of multiple sets of air guide holes 12 to adapt to the exhaust requirements of different stages of die casting. At the same time, relying on the unblocking brush 19 with composite motion, it performs real-time mechanical cleaning of the key intersection and easily blocked parts of the exhaust channel 5 and the air guide channel 6. Then, the periodic oscillation of the linkage pipe 21 forms an instantaneous negative pressure to simultaneously suck away the debris and dust that have been cleaned. This fundamentally avoids blockage of the exhaust channel and ensures long-term unobstructed airflow, ultimately reducing the porosity defect rate of castings and improving the operational stability of the system.

[0057] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. An automotive magnesium alloy seat frame, characterized by: It includes a one-piece die-cast backrest frame, seat chassis and connecting part. The backrest frame and seat chassis are connected as a whole through the connecting part. All three are one-piece die-cast structures made of the same magnesium alloy material, without additional welding and assembly processes. The inner side of the seat chassis is provided with one-piece molded limiting holes and threaded holes. The backrest frame has a one-piece molded lumbar support mounting groove. The headrest mounting position at the top of the backrest frame has a die-cast annular reinforcing rib.

2. The magnesium alloy seat frame of claim 1, wherein: The magnesium alloy composition by weight percentage is: Al 4.2~7.0%, Mn 0.15~0.5%, RE 0.20~2.50%, Y 0.01~1.5%, Ca 0.03~0.80%, Fe+Ni+Cu total content ≤0.01%, Zn ≤0.20%, with the balance being Mg, of which the total weight percentage of RE+Y is ≥0.5%, and RE is a mixture of La and Ce rare earth elements.

3. A die-casting processing device for automotive magnesium alloy seat frames according to claim 1, characterized in that: The system includes a side cylinder, a guide rod, a fixed module, a liquid injection block, a gas exhaust mechanism, a cavity on the fixed module that matches the shape of the seat frame, a receiving groove on the liquid injection block, a guide hole on the receiving groove, and a drive mechanism for driving the fixed module to reciprocate along the length of the guide rod; the guide rod is fixedly connected to the side cylinder; the fixed module is slidably connected to the guide rod, and the receiving groove is located on the movement trajectory of the fixed module; the gas exhaust mechanism includes a filter plate, an exhaust groove on the liquid injection block, and gas exhaust components symmetrically arranged on both sides of the exhaust groove along its width; the filter plate is fixedly connected to the exhaust groove; the gas exhaust components include a guide groove and a guide section on the exhaust groove; the guide section includes a piston cylinder, a piston block, and a discharge valve. The system comprises an air tube, an inhalation tube assembly, a long rod, a power unit for driving the piston block to reciprocate along the length of the piston cylinder, a drive unit for driving the long rod to reciprocate vertically, and several air guiding units equidistantly arranged along the length of the long rod. The piston cylinder is fixedly connected to the exhaust groove; the piston block is slidably connected to the piston cylinder; both the exhaust pipe and the inhalation tube assembly are connected to the piston cylinder; the exhaust pipe's outlet faces the exhaust groove, and the inhalation port of the inhalation tube assembly faces the air guiding groove; the long rod is slidably connected to the air guiding groove; the air guiding unit includes an air guiding hole opened on the air guiding groove and an orifice adjustment plate for sealing the air guiding hole; the air guiding hole communicates with a receiving groove; the orifice adjustment plate is fixedly connected to the long rod and is in contact with the air guiding groove.

4. The die-casting processing device for automotive magnesium alloy seat frames according to claim 3, characterized in that: The air guiding unit also includes a spoiler fan blade; the spoiler fan blade is fixedly connected to the aperture adjustment plate.

5. The die-casting processing device for automotive magnesium alloy seat frames according to claim 3, characterized in that: The gas exhaust assembly also includes groove unblocking sections symmetrically arranged on both sides of the piston cylinder; the groove unblocking section includes a guide rod, a nut seat, a side block, a base plate, an unblocking brush, and a motion unit for driving the nut seat to reciprocate along the length of the guide rod; the guide rod is fixedly connected to the exhaust groove; the nut seat is slidably connected to the guide rod; the side block is fixedly connected to the nut seat; the base plate is connected to the side block; the unblocking brush is located at the connection between the gas guide groove and the exhaust groove, and the unblocking brush is fixedly connected to the base plate.

6. The die-casting processing device for automotive magnesium alloy seat frames according to claim 5, characterized in that: The groove unblocking section also includes an auxiliary unit; the auxiliary unit includes an auxiliary rod and an auxiliary component for driving the auxiliary rod to make vertical reciprocating motion; the auxiliary rod is slidably connected to the side block; and the base plate is fixedly connected to the auxiliary rod.

7. The die-casting processing device for automotive magnesium alloy seat frames according to claim 5, characterized in that: The suction pipe assembly includes suction pipes symmetrically arranged on both sides of the piston cylinder; the groove unblocking part also includes a linkage unit; the linkage unit includes a linkage pipe, a connecting rod, and a linkage hole assembly symmetrically opened on both sides of the linkage pipe; the linkage pipe is hinged to the suction pipe and the linkage pipe communicates with the suction pipe; the two ends of the connecting rod are respectively hinged to the linkage pipe and the side block; the side block abuts against the linkage pipe.

8. The die-casting processing device for automotive magnesium alloy seat frames according to claim 7, characterized in that: The linkage hole group includes several linkage holes arranged at equal intervals; the linkage unit also includes a linkage rod and several arc-shaped blocks arranged at equal intervals along the length direction of the linkage rod; the linkage rod is fixedly connected to the exhaust groove; the arc-shaped blocks are fixedly connected to the linkage rod, and the arc-shaped blocks are located on the movement trajectory of the linkage holes.

9. The die-casting processing device for automotive magnesium alloy seat frames according to claim 3, characterized in that: The drive unit includes a drive shaft, a first gear, a rack, and a drive component for rotating the drive shaft; the drive shaft is rotatably connected to the exhaust groove; the first gear is fixedly connected to the drive shaft; the rack is fixedly connected to the long rod, and the rack meshes with the first gear.

10. The die-casting processing device for automotive magnesium alloy seat frames according to claim 9, characterized in that: The power unit includes a power shaft, a second gear, a cam, and a first spring; the power shaft is rotatably connected to the exhaust channel; the second gear and the cam are both fixedly connected to the power shaft; the second gear meshes with the first gear; the piston block abuts against the cam; and the two ends of the first spring are respectively connected to the piston cylinder and the piston block.

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