A composite injection assembly and die casting apparatus

Abstract

The application discloses a composite injection assembly and a die casting equipment, which comprises a compression chamber, a mold pouring system connected with the die casting equipment, and a feeding port for feeding liquid metal into the compression chamber; a filling punch axially arranged in the compression chamber to press the liquid metal in the compression chamber into the mold pouring system; a pressurizing punch used for driving or axially moving relative to the filling punch, the cross-sectional area of the pressurizing punch being smaller than that of the filling punch; and a clutching device used for connecting the filling punch and the pressurizing punch, the clutching device comprising a fastening state and a loosening state, in the fastening state, the pressurizing punch drives the filling punch to axially move together; when the filling punch abuts against the inner top wall of the compression chamber, the clutching device is switched to the loosening state, in the loosening state, the pressurizing punch continues to axially move relative to the filling punch to extend into the mold pouring system to pressurize after passing through the compression chamber. The filling punch has a large cross-sectional area, so that the filling stroke and the filling time can be reduced; and the pressurizing punch has a small cross-sectional area, so that the solidification pressure can be increased and the casting quality can be improved.

Description

Technical Field

[0001] This invention relates to the field of die casting equipment, and more particularly to a composite injection assembly and die casting equipment. Background Technology

[0002] The basic principle of die casting is to inject molten metal or non-metal into the pressure chamber of the die casting machine. Through the movement of the injection punch, the molten metal is forced to fill the cavity through the mold gating system at an appropriate speed under pressure, and then quickly cools and solidifies to form a die casting. Figure 1 The diagram shows the filling structure of a traditional die-casting equipment. The pressure chamber is a hollow cylindrical shape, and the injection punch is cylindrical. The inner diameter of the pressure chamber is the same as the outer diameter of the punch.

[0003] During the filling and subsequent cooling and forming process, the punch needs to apply a certain pressure to the liquid. Under a fixed punching force, the pressure exerted on the liquid is inversely proportional to the cross-sectional area of ​​the punch. Therefore, to obtain higher casting pressure, the circular cross-sections of the punch and the pressure chamber should have the smallest possible diameter. However, for a given amount of molten liquid, the smaller the inner diameter of the pressure chamber, the larger the length of the pressure chamber must be, resulting in a longer punch filling stroke. Because it is necessary to ensure that the molten liquid completes filling before solidifying and losing its fluidity, some design and usage problems arise: First, the short filling time requires a very high punch speed, placing high demands on the punch's drive and control system, leading to excessively high production costs for the injection system; second, increasing the casting pressure requires the punch diameter to be as small as possible, which means the pressure chamber becomes correspondingly longer, making the long-stroke precision fit between the pressure chamber and the punch extremely difficult. Especially in actual working environments, under high temperature and pressure, the pressure chamber is prone to bending or other non-uniform deformations along its length, which in severe cases can hinder the smooth passage of the punch, accelerate the wear of the punch and the inner wall of the pressure chamber, and affect its service life. Summary of the Invention

[0004] This invention addresses the shortcomings of existing technologies by providing a composite injection assembly, comprising: The pressure chamber is connected to the mold casting system of the die casting equipment, and the pressure chamber is provided with a feed port for the molten metal to enter; A filling punch is axially movable within the pressure chamber to inject molten material into the mold gating system. A pressurizing punch is axially slidably connected to the pressure chamber. The pressurizing punch and the filling punch move synchronously or relatively in the axial direction. The cross-sectional area of ​​the pressurizing punch is smaller than that of the filling punch. A clutch device is used to connect the filling punch and the pressurizing punch. The clutch device includes a tightened state and a loosened state. In the tightened state, the pressurizing punch drives the filling punch to move axially together. When the filling punch abuts against the inner top wall of the pressure chamber, the clutch device switches to the loosened state. In the loosened state, the pressurizing punch continues to move axially relative to the filling punch to pass through the pressure chamber and extend into the mold gating system for pressurization.

[0005] Optionally, the clutch device includes a spring and a clamping plate. The filling punch has a mounting cavity for accommodating the spring and the clamping plate. The two ends of the spring abut against the inner wall of the mounting cavity and the clamping plate, respectively. The clamping plate is used to press against the side wall of the pressurizing punch so that the filling punch moves axially with the pressurizing punch.

[0006] Optionally, there are at least two springs, clamping plates, and mounting cavities, and several mounting cavities are distributed at equal angles along the circumference of the pressurizing punch, so that several clamping plates clamp the pressurizing punch from several equally spaced positions, keeping the axis of the pressurizing punch coincident with the axis of the pressure chamber.

[0007] Optionally, the clutch device includes a spring collet and a collet drive. The inner ring of the filling punch is provided with a limiting cavity for accommodating the spring collet and the collet drive. The sidewall of the limiting cavity is provided with a wedge surface that slopes upward from the outside to the inside. When the collet drive drives the spring collet to move upward to the limiting position on the wedge surface, the spring collet clamps the pressure punch. When the collet drive drives the spring collet to move downward, the spring collet releases the pressure punch, allowing the pressure punch to move relative to the filling punch.

[0008] Optionally, the clutch device further includes a position retainer, one end of which is connected to the filling punch. When the spring collet releases the pressurizing punch, the position retainer supports the bottom of the filling punch to maintain the position of the filling punch.

[0009] Optionally, the bottom of the pressure chamber is provided with a punch limiting plate, which is used to limit the downward movement of the filling punch. The punch limiting plate is provided with a clearance for avoiding the pressurizing punch. The pressurizing punch and the punch limiting plate are movably connected vertically.

[0010] Optionally, the system also includes a sealing plate and a sealing plate drive, wherein the sealing plate drive is connected to the sealing plate and drives the sealing plate to move axially to open or close the feed port.

[0011] Optionally, the end of the pressurizing punch away from the pressure chamber is connected to a punch drive, which provides power for the axial movement of the pressurizing punch.

[0012] Optionally, the mold casting system includes a casting cavity and a mold cavity, with the two ends of the casting cavity connected to the pressure chamber and the mold cavity, respectively.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The diameter of the pressurizing punch is smaller than that of the filling punch. During the filling stage, the pressurizing punch drives the filling punch to move axially together via a clutch device. If the diameter of the filling punch is larger than that of a traditional punch, the filling speed of the molten metal can be correspondingly greater while maintaining the same movement speed. In other words, the movement distance or the axial length of the pressure chamber can be reduced, greatly minimizing the risk of bending deformation between the punch and the pressure chamber, and effectively overcoming the production and control difficulties caused by an excessively long pressure chamber. At the same time, the diameter of the pressurizing punch can also be smaller than that of a traditional punch. If the diameter is smaller than that of a traditional punch, the required punch thrust can be correspondingly smaller under the same pressurization pressure, significantly reducing the manufacturing and maintenance costs of the punch drive device.

[0014] 2. After the filling punch completes filling by contacting the top wall of the pressure chamber, the pressurizing punch, aided by the separation mechanism of the clutch device, can pass through the pressure chamber alone with a smaller cross-sectional area and extend into the mold gating system, continuing to move forward to extrude the molten metal, achieving the effects of pressure increase and holding, as well as solidification and feeding. This ensures efficient and stable filling while achieving strong feeding, which helps eliminate shrinkage cavities and porosity inside the casting, improving the density of the microstructure and mechanical properties.

[0015] 3. In Embodiment 1 of the clutch device, a friction-type clamping structure is formed by a spring and a clamping plate. This structure is simple, and after testing and selecting a suitable spring coefficient, selective transmission between the filling punch and the pressurizing punch can be achieved autonomously without additional external power or control signals. The radial thrust provided by the spring keeps the clamping plate pressed against the side wall of the pressurizing punch. The resulting static friction is sufficient to overcome the resistance to the movement of the filling punch caused by the gravity of the filling punch and the molten metal during the filling stage, thus ensuring that the filling punch can move upward synchronously with the pressurizing punch to complete stable filling. When the filling punch reaches the top wall of the pressure chamber and is mechanically limited, the moving resistance increases and exceeds the maximum static friction that the clutch device can provide. The pressurizing punch then slides relative to the filling punch and continues to move forward independently to perform pressurization. This friction-based switching mechanism realizes automatic switching between the filling and pressurizing stages, eliminating the need for complex clutches or valve control systems, improving operational reliability, and reducing manufacturing costs and assembly difficulty.

[0016] 4. In Embodiment Two of the clutch device, during the filling stage, the chuck drive pushes the spring chuck upward to the wedge-shaped limit position. The wedge-shaped limit converts the downward pressure into an inward contraction force, forcing the spring chuck to grip the pressure punch, forming a reliable rigid linkage to ensure synchronous movement of the pressure punch and the filling punch. When the filling punch abuts against the top wall of the pressure chamber, the chuck drive reverses and drives the spring chuck downward, actively eliminating the radial clamping force, releasing the pressure punch, and allowing the pressure punch to advance relative to the filling punch. This active control method avoids problems such as unstable slippage timing, interface wear, and spring fatigue that may occur with passive friction slippage. It is suitable for applications with high process precision requirements, improving control capability and the consistency of casting quality.

[0017] In addition, the present invention provides a die-casting apparatus, including the composite injection assembly as described above.

[0018] Compared with the prior art, the die-casting equipment described in this invention has the same advantages as the above-mentioned composite injection assembly, which will not be repeated here. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be discussed below. Obviously, the technical solutions described in conjunction with the accompanying drawings are only some embodiments of the present invention. For those skilled in the art, other embodiments and their accompanying drawings can be obtained based on the embodiments shown in these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of a traditional filling structure in the background technology.

[0021] Figure 2 This is a schematic diagram of the initial state of the present invention.

[0022] Figure 3 yes Figure 2 Enlarged view of part A in the middle.

[0023] Figure 4 This is a structural schematic diagram of the initial state of the first embodiment of the clutch device.

[0024] Figure 5 yes Figure 4 Enlarged view of section B in the middle.

[0025] Figure 6 This is a structural schematic diagram of the filling stage of the first embodiment of the clutch device.

[0026] Figure 7 yes Figure 6 Enlarged view of section C.

[0027] Figure 8This is a schematic diagram of the pressurization stage of the first embodiment of the clutch device.

[0028] Figure 9 yes Figure 8 Enlarged view of section D in the middle.

[0029] Figure 10 This is a schematic diagram of the reset stage of the first embodiment of the clutch device.

[0030] Figure 11 yes Figure 10 Enlarged view of section E in the middle.

[0031] Figure 12 This is a structural schematic diagram of the initial state of the second embodiment of the clutch device.

[0032] Figure 13 yes Figure 12 Enlarged view of section F in the middle.

[0033] In the diagram: 1. Injection punch; 2. Pressure chamber; 21. Feed port; 22. Punch limiting plate; 221. Clearance opening; 3. Filling punch; 31. Mounting cavity; 32. Limiting cavity; 321. Wedge surface; 4. Pressurizing punch; 5. Spring; 6. Clamping plate; 7. Spring chuck; 8. Chuck drive; 9. Gating cavity; 10. Mold cavity; 11. Sealing plate; 12. Sealing plate drive; 13. Punch drive; 14. Position holding component; 15. Clutch device. Detailed Implementation

[0034] The technical solutions of various embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments described in the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] The accompanying drawings of the embodiments of the present invention provide a coordinate system XY, wherein the positive direction of the X-axis represents the left, the negative direction of the X-axis represents the right, the positive direction of the Y-axis represents the top, and the negative direction of the Y-axis represents the bottom.

[0036] like Figure 2 and Figure 3 As shown, an embodiment of the present invention provides a composite injection assembly, comprising: Pressure chamber 2 is connected to the mold casting system of the die casting equipment, and the pressure chamber 2 is provided with a feed port 21 for the molten metal to enter; The filling punch 3 is axially movable within the pressure chamber 2 to inject molten material from the pressure chamber 2 into the mold gating system. The pressurizing punch 4 is axially slidably connected to the pressure chamber 2. The pressurizing punch 4 and the filling punch 3 move synchronously or relatively in the axial direction. The cross-sectional area of ​​the pressurizing punch 4 is smaller than the cross-sectional area of ​​the filling punch 3. The clutch device 15 is used to connect the filling punch 3 and the pressurizing punch 4. The clutch device 15 includes a tightened state and a loosened state. In the tightened state, the pressurizing punch 4 drives the filling punch 3 to move axially together. When the filling punch 3 abuts against the inner top wall of the pressure chamber 2, the clutch device 15 switches to the loosened state. In the loosened state, the pressurizing punch 4 continues to move axially relative to the filling punch 3 to pass through the pressure chamber 2 and extend into the mold gating system for pressurization.

[0037] Compared to Figure 1 Compared to the conventional filling structure shown, this application accelerates the filling process of the molten metal by using a filling punch 3 with a larger cross-sectional area, significantly reducing the travel distance and even the speed during filling, substantially reducing the processing and control difficulty, as well as production and maintenance costs. Furthermore, it effectively utilizes space and reduces the axial dimensions of the equipment; the axial length of the pressure chamber 2 in this application is approximately half that of the conventional pressure chamber 2. This application uses the filling punch 3 and the pressurizing punch 4, in conjunction with the clutch device 15, to form a composite punch, replacing the traditional injection punch 1, achieving a dynamic connection between the two stages of action.

[0038] like Figure 2 As shown, the diameter of the pressurizing punch 4 is smaller than the diameter of the filling punch 3. During the filling stage, the pressurizing punch 4 drives the filling punch 3 to move axially together via the clutch device 15. For example, if the diameter of the filling punch 3 is three times that of a conventional punch, the filling speed (mm³ / s) of the melt volume can be increased by nine times while maintaining the same movement speed. In other words, the movement distance or the axial length of the pressure chamber 2 can be reduced by about 90%, greatly reducing the risk of bending deformation between the punch and the pressure chamber 2, and effectively overcoming the difficulties in production, processing, and control caused by the excessive length of the pressure chamber 2. At the same time, the diameter of the pressurizing punch 4 can also be smaller than that of a conventional punch. If it is one-third the diameter of a conventional punch, the required punch thrust can be reduced to one-ninth of the original under the same pressurization pressure, significantly reducing the manufacturing and maintenance costs of the punch drive device 13.

[0039] After the filling punch 3 completes filling by contacting the top wall of the pressure chamber 2, the pressurizing punch 4, with the help of the separation mechanism of the clutch device 15, can pass through the pressure chamber 2 alone with a smaller cross-sectional area and extend into the mold gating system, continuing to move forward to extrude the molten metal, achieving the effects of pressure increase, pressure holding, and solidification feeding. This design means that obtaining high casting pressure no longer depends on reducing the cross-sectional area of ​​the entire pressure chamber 2, but is accomplished by the narrow diameter of the front end of the pressurizing punch 4. This ensures efficient and stable filling while achieving strong feeding, which helps eliminate shrinkage cavities and porosity inside the casting, and improves the density and mechanical properties of the structure. The clutch device 15 can be a spring structure, an electromagnetic adsorption structure, etc.

[0040] like Figures 4 to 11 As shown, in one embodiment of the clutch device 15: Optionally, the clutch device 15 includes a spring 5 and a clamping plate 6. The filling punch 3 has a mounting cavity 31 for accommodating the spring 5 and the clamping plate 6. The two ends of the spring 5 abut against the inner wall of the mounting cavity 31 and the clamping plate 6, respectively. The clamping plate 6 is used to press against the side wall of the pressurizing punch 4 so that the filling punch 3 moves axially with the pressurizing punch 4.

[0041] A friction-type clamping structure is formed by spring 5 and clamping plate 6. This simple structure, after selecting a suitable spring coefficient for spring 5 through testing, allows for autonomous selective transmission between the filling punch 3 and the pressurizing punch 4 without additional external power or control signals. The radial thrust provided by spring 5 keeps clamping plate 6 pressed against the side wall of pressurizing punch 4. The resulting static friction is sufficient to overcome the resistance to movement of filling punch 3 caused by the weight of the filling punch 3 and the molten metal during the filling stage, ensuring that filling punch 3 can move upward synchronously with pressurizing punch 4 for stable filling. When filling punch 3 reaches the top wall of pressure chamber 2 and is mechanically limited, the moving resistance increases and exceeds the maximum static friction provided by clutch device 15. Pressurizing punch 4 then slides relative to filling punch 3, continuing to move forward independently to apply pressure. Filling punch 3, under the action of static friction, resists its own weight, maintaining its position and waiting for pressurizing punch 4 to move downward and reset. This friction-based switching mechanism enables automatic switching between the filling and pressurization stages, eliminating the need for complex clutches or valve control systems. This improves operational reliability and reduces manufacturing costs and assembly difficulty.

[0042] like Figure 5 As shown, optionally, there are at least two springs 5, clamping plates 6, and mounting cavities 31. Several mounting cavities 31 are distributed at equal angles around the circumference of the pressure punch 4, so that several clamping plates 6 clamp the pressure punch 4 from several equally spaced positions, keeping the axis of the pressure punch 4 coincident with the axis of the pressure chamber 2.

[0043] This circumferentially evenly distributed angle allows the clamping force to act relatively evenly on the outer circumferential surface of the pressure punch 4, effectively avoiding radial imbalance caused by unilateral bias and preventing tilting, jamming, or uneven wear between the pressure punch 4 and the inner hole of the filling punch 3 during operation. With the pressure punch 4 operating under balanced circumferential force, the movement is smoother, the mating clearance remains stable, and thus the service life of the precision mating surfaces is relatively extended.

[0044] like Figure 12 and Figure 13 As shown, in embodiment 2 of the clutch device 15: Optionally, the clutch device 15 includes a spring collet 7 and a collet drive 8. The inner ring of the filling punch 3 is provided with a limiting cavity 32 for accommodating the spring collet 7 and the collet drive 8. The side wall of the limiting cavity 32 is provided with a wedge surface 321 that slopes upward from the outside to the inside. When the collet drive 8 drives the spring collet 7 to move upward to the wedge surface 321, the spring collet 7 clamps the pressure punch 4. When the collet drive 8 drives the spring collet 7 to move downward, the spring collet 7 releases the pressure punch 4, causing the pressure punch 4 to move relative to the filling punch 3.

[0045] Spring collet 7 (also known as a collet) is commonly used as an accessory for high-precision clamping of workpieces or cutting tools on machine tools (such as lathes and milling machines). Its core working principle is based on a tapered sleeve (i.e., a limiting cavity 32 with a wedge surface 321) that, when subjected to the axial tension of the collet drive 8, generates uniform radial contraction, thereby tightly gripping the internal object (i.e., gripping the pressure punch 4) from all sides. Both spring collet 7 and collet drive 8 are existing technologies, and their structure and connection methods will not be described in detail here.

[0046] During the filling stage, the chuck drive 8 pushes the spring chuck 7 upward to the wedge surface 321, where the wedge surface 321 converts the downward pressure into an inward contraction force, forcing the spring chuck 7 to grip the pressure punch 4, forming a reliable rigid linkage that ensures the synchronous movement of the pressure punch 4 and the filling punch 3. When the filling punch 3 abuts against the top wall of the pressure chamber 2, the chuck drive 8 reverses direction, driving the spring chuck 7 downward to actively eliminate the radial clamping force, releasing the pressure punch 4 and allowing it to advance relative to the filling punch 3. This active control method avoids problems such as unstable slippage timing, interface wear, and spring 5 fatigue that may occur with passive friction slippage. It is suitable for applications requiring high process precision, improving control capabilities and the consistency of casting quality.

[0047] like Figure 13As shown, optionally, the clutch device 15 further includes a position retainer 14, one end of which is connected to the filling punch 3. When the spring collet 7 releases the pressurizing punch 4, the position retainer 14 is supported on the bottom of the filling punch 3 to maintain the position of the filling punch 3.

[0048] A position retainer 14 is provided on the punch limiting plate 22 and connected to the bottom of the filling punch 3. During the pressurization stage, after the spring collet 7 releases the pressurizing punch 4, it counteracts the gravity of the filling punch 3, keeping the filling punch 3 in a position against the top wall of the pressure chamber 2. When pressurization ends and the pressurizing punch 4 moves downward, the spring collet 7 re-enters the limiting cavity 32 with the wedge surface 321, re-clamping the pressurizing punch 4, causing the filling punch 3 to move downward and reset along with the pressurizing punch 4. The position retainer 14 can be a hydraulic cylinder. Under the action of the balance valve, the lower oil chamber maintains a constant pressure, providing a constant force. This allows for passive support without the need for active control.

[0049] In summary, both Embodiment 1 and Embodiment 2 of the clutch device 15 provide two implementation methods, both of which can achieve selective clamping effect.

[0050] like Figure 5 As shown, optionally, the bottom of the pressure chamber 2 is provided with a punch limiting plate 22, which is used to limit the downward movement of the filling punch 3. The punch limiting plate 22 is provided with a clearance opening 221 for avoiding the pressurizing punch 4. The pressurizing punch 4 and the punch limiting plate 22 are connected to move up and down.

[0051] The punch limiting plate 22 is detachably connected to the pressure chamber 2 to facilitate the installation of the filling punch 3 and the pressurizing punch 4 between the pressure chamber 2 and the punch limiting plate 22. Several position holding members 14 are evenly distributed and installed on the punch limiting plate 22 along the circumference of the pressurizing punch 4 to provide stable and evenly spaced directional support force to the bottom of the filling punch 3.

[0052] The punch limiting plate 22 provides a definite mechanical stop for the downward endpoint of the filling punch 3, thereby precisely controlling the effective volume of the pressure chamber 2 before molten metal injection, ensuring the uniformity of the amount of material added each time, and thus stabilizing the filling weight and dimensional accuracy of the die casting. At the same time, an obstacle clearance 221 is provided to allow the small-diameter pressure punch 4 to continue to pass downwards without obstruction, so that the strokes of the two punches can partially overlap in the axial direction without interfering with each other. It realizes the dual functions of filling limiting and pressure penetration within a limited space, with a compact structure and reasonable layout.

[0053] like Figure 5As shown, optionally, it also includes a sealing plate 11 and a sealing plate drive 12, wherein the sealing plate drive 12 is connected to the sealing plate 11 and drives the sealing plate 11 to move axially to open or close the feed port 21.

[0054] The sealing plate drive 12 moves the sealing plate 11, making the feeding process more automated. It eliminates the need for manual opening or closing of the feed inlet 21, ensuring operational safety and preventing molten metal from contaminating surrounding mechanisms. Simultaneously, in conjunction with the external container for storing the molten metal and the pipes supplying the molten metal, the pressure chamber 2 remains relatively enclosed, reducing contact between the molten metal and external air. This lowers the probability of porosity and oxide inclusions in the casting, improving casting quality. The sealing plate drive 12 can be an electric actuator, pneumatic actuator, or other drive component that achieves the same effect.

[0055] like Figure 2 As shown, optionally, the end of the pressurizing punch 4 away from the pressure chamber 2 is connected to a punch drive 13, which is used to provide power for the axial movement of the pressurizing punch 4.

[0056] The pressurizing punch 4 is powered axially by an independent punch drive 13, which can be easily automated to adjust the moving speed of the pressurizing punch 4. The punch drive 13 can be an electric push rod, pneumatic push rod, or other drive components that can play the same role.

[0057] like Figure 2 As shown, optionally, the mold casting system includes a casting cavity 9 and a mold cavity 10, with the two ends of the casting cavity 9 connected to the pressure chamber 2 and the mold cavity 10, respectively.

[0058] The diameters of the pouring cavity 9, the upper opening of the pressure chamber 2, and the pressure punch 4 are all the same, while the diameter of the mold cavity 10 is larger than that of the pouring cavity 9. A dedicated pouring cavity 9 is provided between the pressure chamber 2 and the mold cavity 10, providing a channel for the forward extension of the pressure punch 4, allowing the pressure punch 4 to complete the pressure compensation action without penetrating deep into the mold cavity 10.

[0059] Work process: like Figure 4 and Figure 5 As shown, both the filling punch 3 and the pressurizing punch 4 are in the initial position, and the height of the initial position is below the feed port 21. The sealing plate drive 12 drives the sealing plate 11 to move down and open the feed port 21 of the pressure chamber 2. The molten liquid enters the pressure chamber 2 through the feed port 21. like Figure 6 and Figure 7 As shown, after the sealing plate drive 12 moves the sealing plate 11 upward to close the feed port 21, the punch drive 13 moves the pressure punch 4 upward, and the filling punch 3 moves upward together with the pressure punch 4 through the clutch device 15 until the filling punch 3 abuts the inner top wall of the pressure chamber 2 to complete the filling action. like Figure 8 and Figure 9 As shown, the pressure punch 4 overcomes the static friction force generated by the clutch device 15 and continues to move upward relative to the filling punch 3, extending out of the pressure chamber 2. The head of the pressure punch 4 enters the casting chamber 9 to squeeze the molten liquid, thereby achieving pressure increase and pressure holding, as well as solidification and shrinkage, and completing the pressure action. like Figure 10 and Figure 11 As shown, fourth, the punch drive 13 drives the pressurizing punch 4 to move downward. In the case of the clutch device 15 embodiment one, the pressurizing punch 4 drives the filling punch 3 to move downward together; in the case of the clutch device 15 embodiment two, the position holding member 14 drives the filling punch 3 to move downward.

[0060] like Figure 4 As shown in Figure 5, when the pressurizing punch 4 and the filling punch 3 return to their initial positions, the next work cycle begins.

[0061] In summary, the beneficial effects of this application are as follows: 1. By using a shorter stroke, rapid filling is achieved, reducing filling time; 2. It eliminates the need for accumulators and control devices required by traditional fast-charging mechanisms, effectively solving the design and usage problems of traditional injection mechanisms, while reducing manufacturing and maintenance costs; 3. It can reduce the cross-sectional area of ​​the punch used for pressurization, increase the solidification pressure under the same driving force, and improve the quality of castings; under the same solidification pressure, it can reduce the size of the driving device and reduce costs.

[0062] 4. The use of multiple punches makes it easier to adjust and control the filling speed and pressurization pressure.

[0063] Another embodiment of the present invention provides a die-casting apparatus, including the composite injection assembly described above.

[0064] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects. The scope of the invention is defined by the appended claims, not by the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0065] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A composite injection assembly, characterized in that, include: Pressure chamber (2) is connected to the mold casting system of the die casting equipment. The pressure chamber (2) is provided with a feed port (21) for the molten metal to enter. A filling punch (3) is axially movable within the pressure chamber (2) to inject molten material from the pressure chamber (2) into the mold casting system. The pressurizing punch (4) is axially slidably connected to the pressure chamber (2). The pressurizing punch (4) and the filling punch (3) move synchronously or relatively in the axial direction. The cross-sectional area of ​​the pressurizing punch (4) is smaller than the cross-sectional area of ​​the filling punch (3). A clutch device (15) is used to connect the filling punch (3) and the pressurizing punch (4). The clutch device (15) includes a tightened state and a loosened state. In the tightened state, the pressurizing punch (4) drives the filling punch (3) to move axially together. When the filling punch (3) abuts against the inner top wall of the pressure chamber (2), the clutch device (15) switches to the loosened state. In the loosened state, the pressurizing punch (4) continues to move axially relative to the filling punch (3) to pass through the pressure chamber (2) and extend into the mold gating system for pressurization.

2. The composite injection assembly according to claim 1, characterized in that, The clutch device (15) includes a spring (5) and a clamping plate (6). The filling punch (3) has a mounting cavity (31) for accommodating the spring (5) and the clamping plate (6). The two ends of the spring (5) abut against the inner wall of the mounting cavity (31) and the clamping plate (6) respectively. The clamping plate (6) is used to press against the side wall of the pressurizing punch (4) so ​​that the filling punch (3) moves axially with the pressurizing punch (4).

3. The composite injection assembly according to claim 2, characterized in that, There are at least two springs (5), clamping plates (6), and mounting cavities (31). Several mounting cavities (31) are distributed at equal angles around the circumference of the pressurizing punch (4) so ​​that several clamping plates (6) clamp the pressurizing punch (4) from several equally spaced positions, keeping the axis of the pressurizing punch (4) coincident with the axis of the pressure chamber (2).

4. The composite injection assembly according to claim 1, characterized in that, The clutch device (15) includes a spring collet (7) and a collet drive (8). The inner ring of the filling punch (3) is provided with a limiting cavity (32) for accommodating the spring collet (7) and the collet drive (8). The side wall of the limiting cavity (32) is provided with a wedge surface (321) that slopes upward from the outside to the inside. When the collet drive (8) drives the spring collet (7) to move upward to the wedge surface (321), the spring collet (7) clamps the pressurizing punch (4). When the collet drive (8) drives the spring collet (7) to move downward, the spring collet (7) releases the pressurizing punch (4), so that the pressurizing punch (4) moves relative to the filling punch (3).

5. The composite injection assembly according to claim 4, characterized in that, The clutch device (15) further includes a position retainer (14), one end of which is connected to the filling punch (3). When the spring collet (7) releases the pressurizing punch (4), the position retainer (14) is supported on the bottom of the filling punch (3) to maintain the position of the filling punch (3).

6. The composite injection assembly according to claim 1, characterized in that, The bottom of the pressure chamber (2) is provided with a punch limiting plate (22), which is used to limit the downward movement of the filling punch (3). The punch limiting plate (22) is provided with a clearance opening (221) for avoiding the pressurizing punch (4). The pressurizing punch (4) and the punch limiting plate (22) are connected to move up and down.

7. The composite injection assembly according to claim 1, characterized in that, It also includes a sealing plate (11) and a sealing plate drive (12), the sealing plate drive (12) being connected to the sealing plate (11) and driving the sealing plate (11) to move axially to open or close the feed port (21).

8. The composite injection assembly according to claim 1, characterized in that, The end of the pressurizing punch (4) away from the pressure chamber (2) is connected to a punch drive (13), which is used to provide power for the axial movement of the pressurizing punch (4).

9. The composite injection assembly according to claim 1, characterized in that, The mold casting system includes a casting cavity (9) and a mold cavity (10), with the two ends of the casting cavity (9) connected to the pressure chamber (2) and the mold cavity (10), respectively.

10. A die-casting equipment, characterized in that, Includes the composite injection assembly as described in any one of claims 1-9.

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