Horizontal opposite force dynamic balance demolding device and method for lightweight aluminum alloy die-casting mold

Abstract

The invention relates to the technical field of demolding, and discloses a horizontal opposite force dynamic balance demolding device and method.The horizontal opposite force dynamic balance demolding device comprises a fixed mold and a mold core installed on the fixed mold, an ejector rod is vertically inserted into the fixed mold, and a pressing plate is arranged on the top of the mold core; and a power distribution assembly for distributing power for driving the ejector rod and the pressing plate is mounted in the fixed mold. Through a dynamic balance mechanism of the ejection acting force and the horizontal reverse pressure, the workpiece deformation risk is reduced, during demolding, when the ejection rod exerts the ejection acting force, the pressing plate synchronously provides the matched horizontal reverse pressure, the lateral mold sticking force and scraping force between the workpiece and the mold core are accurately counteracted, and the demolding quality is improved. The appearance distortion caused by horizontal deviation and uneven stress of the workpiece is avoided; and through staged pressure relief of the first pressure reduction cavity and the second pressure reduction cavity, reverse pressure is gradually weakened along with the workpiece separation process, whole-process force balance is maintained, extrusion damage is prevented, the precision and surface quality of the thin-wall precision workpiece are guaranteed, and the rejection rate is greatly reduced.

Description

Technical Field

[0001] This invention belongs to the field of demolding technology, specifically, it relates to a dynamic balancing demolding device and method for horizontal reverse force of lightweight aluminum alloy die casting mold. Background Technology

[0002] As industries such as automotive and electronics move towards lightweighting and precision, the demand for thin-walled precision die-cast aluminum alloy parts is increasing. These parts have complex structures and thin walls, and traditional demolding devices often face numerous technical challenges during the die-casting demolding process due to lateral sticking forces and scraping forces that easily occur between the workpiece and the mold core.

[0003] Existing demolding mechanisms mostly adopt ejector pin design. When the ejector pin applies ejection force, the workpiece is prone to shape distortion due to horizontal displacement and uneven force. Although some improved devices add pressure plates to provide reverse pressure, the pressure cannot be dynamically adjusted with the ejection process. Either the pressure is insufficient to offset the sticking force, or the pressure is too large to squeeze the workpiece and cause secondary damage.

[0004] In view of this, the present invention is proposed. Summary of the Invention

[0005] To solve the above-mentioned technical problems, the basic concept of the technical solution adopted by the present invention is as follows: A lightweight aluminum alloy die-casting mold with horizontal reverse force dynamic balancing demolding device includes a fixed mold and a mold core installed on the fixed mold.

[0006] The fixed mold is vertically inserted with an ejector rod, which is used to eject the workpiece. A pressure plate is provided on the top of the mold core and covers the workpiece. The pressure plate is used to reverse the end face of the workpiece. The fixed mold is equipped with a power distribution component for distributing the power of the ejector rod and the pressure plate. The power distribution assembly is equipped with a accumulator, which has an ejector chamber and a reverse ejector chamber inside. An ejector piston and a reverse ejector piston, which move synchronously, are slidably arranged inside the ejector chamber and the reverse ejector chamber, respectively. The ejector chamber has an expansion chamber. When the ejector piston and the reverse ejector piston move, the reverse ejector piston moves to compress the chamber and thus drive the pressure plate to press. When the reverse ejector piston presses against the air outlet, the ejector piston moves from the expansion chamber to the ejector chamber. As it continues to move, the ejector piston continuously increases the pressure, causing the push rod to move upward. The side wall of the reverse ejector piston has a first pressure-reducing chamber and a second pressure-reducing chamber. The volume of the first pressure-reducing chamber is smaller than that of the second pressure-reducing chamber, and it is used to gradually reduce the reverse ejector pressure of the pressure plate to adapt to actual operation.

[0007] In a preferred embodiment of the present invention, four sliders are installed at the four corners of the fixed mold. The sliders are slidably mounted on the external component. The top of the slider is provided with a positioning hole, which is used to position the external component and the slider by locking bolts.

[0008] In a preferred embodiment of the present invention, a positioning seat is installed on the side wall of the fixed mold, a connecting arm is rotatably installed on the positioning seat, a positioning cylinder is installed at the end of the connecting arm, a pressure rod is movably inserted inside the positioning cylinder, a pressure plate is installed at the end of the pressure rod, two mounting holes at ninety degrees are opened on the positioning seat, and a limit hole is opened on the connecting arm. The limit hole and the mounting hole are used to position the angle of the connecting arm after rotation.

[0009] In a preferred embodiment of the present invention, the accumulator is connected to a connecting pipe, which is connected to the air outlet on the anti-top cavity and movably penetrates the side wall of the fixed mold. The end of the connecting pipe is connected to the inner cavity of the positioning cylinder, and a compression piston is slidably arranged inside the positioning cylinder, with the end of the compression piston connected to the pressure rod.

[0010] In a preferred embodiment of the present invention, a fixed base is welded to the outside of the accumulator cover. The bottom of the fixed base is bolted to the side wall of the fixed mold. An electric push rod is installed on the side wall of the fixed mold. The output end of the electric push rod movably passes through the accumulator cover and the fixed mold. A synchronizing rod is installed between the ejector piston and the anti-ejector piston, and the synchronizing rod movably passes through the partition plate used to divide the ejector cavity and the anti-ejector cavity.

[0011] In a preferred embodiment of the present invention, a top plate is installed inside the fixed mold, and several pairs of push rods are movably installed through the top plate. Four limiting seats are installed on the fixed mold, and the ends of the four limiting seats are attached to the bottom of the top plate, and the limiting seats are used to limit the position of the top plate.

[0012] In a preferred embodiment of the present invention, a sliding plate is installed on the side wall of the top plate, and a limiting rod is installed through the sliding plate. The two ends of the limiting rod are installed on the side wall of the fixed mold. A limiting spring is sleeved on the outer side wall of the limiting rod. One end of the limiting spring is engaged with the side wall of the sliding plate, and the other end of the limiting spring is engaged with the fixed mold.

[0013] In a preferred embodiment of the present invention, a connecting cover is installed on the power storage cover, the connecting cover is in communication with the ejection cavity, a connecting rod is movably installed inside the connecting cover, the top of the connecting rod is connected to the bottom of the top plate, a positioning piston is installed at the bottom of the connecting rod, the positioning piston is slidably disposed on the side wall of the connecting cover, and the diameter of the outer expansion cavity is larger than the diameter of the ejection cavity.

[0014] In a preferred embodiment of the present invention, a pressure relief cavity is provided at the end of the anti-top cavity, and the diameter of the pressure relief cavity is larger than the diameter of the anti-top cavity, and a pressure relief hole is provided at the bottom of the pressure relief cavity.

[0015] A method for dynamically balancing horizontal reverse force in a lightweight aluminum alloy die-casting mold for demolding, comprising the following steps: Step 1: Initial standby preparation. After the aluminum alloy workpiece is die-cast into shape on the mold core of the fixed mold, the device is reset to the initial state. Step 2: Pre-press positioning of the pressure plate. Drive the connecting arm on the positioning seat to rotate, so that the positioning cylinder at the end of the connecting arm drives the pressure rod and the pressure plate to rotate synchronously until the pressure plate accurately covers and fits the end face of the workpiece, thus completing the pre-press positioning of the pressure plate. Step 3: The dual piston synchronous drive starts the electric push rod on the side wall of the fixed mold. Its output end pushes the synchronous rod to move. The synchronous rod drives the ejector piston and the reverse ejector piston to slide synchronously and in the same direction along the ejector cavity and the reverse ejector cavity. The reverse ejector piston squeezes the gas in the reverse ejector cavity. The high-pressure gas is transported to the inner cavity of the positioning cylinder through the connecting pipe, which pushes the extrusion piston to drive the pressure rod to extend, so that the pressure plate applies horizontal reverse pressure to press the end face of the workpiece. Step 4: Dynamic Ejection. After the reverse ejection piston slides to block the air outlet of the reverse ejection chamber, the ejection piston enters the ejection chamber from the outer expansion chamber. With the continuous thrust of the electric push rod, the pressure in the ejection chamber gradually increases. Through the connecting cover, the positioning piston and connecting rod drive the top plate to move upward along the limit rod. The top plate drives the ejector rod to extend and push the workpiece. At this time, the reverse pressure of the pressure plate and the ejection force of the ejector rod form a horizontal dynamic balance. During the ejection process, the first pressure-reducing chamber on the side wall of the reverse ejection piston is connected to the connecting pipe to gradually reduce the reverse pressure. After the workpiece is further separated from the mold core, the second pressure-reducing chamber is connected to the connecting pipe, and the reverse pressure is further weakened to meet the force requirements of the workpiece. Step 5: The device resets in a cycle. After the workpiece is completely ejected, the electric push rod is driven to reset in the reverse direction.

[0016] Compared with the prior art, the present invention has the following advantages: This invention reduces the risk of workpiece deformation through a dynamic balance mechanism between ejection force and horizontal reverse pressure. During demolding, while the ejector pin applies the ejection force, the pressure plate simultaneously provides a suitable horizontal reverse pressure, precisely offsetting the lateral sticking force and scraping force between the workpiece and the mold core, thus preventing workpiece deformation due to horizontal offset and uneven force. Furthermore, through the staged pressure relief in the first and second pressure-reducing chambers, the reverse pressure gradually weakens as the workpiece is removed, maintaining force balance throughout the process and preventing crush damage, ensuring the accuracy and surface quality of thin-walled precision workpieces, and significantly reducing the scrap rate.

[0017] The specific embodiments of the present invention will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0018] In the attached diagram: Figure 1 A three-dimensional diagram of a dynamic balancing demolding device for horizontal reverse force of a lightweight aluminum alloy die-casting mold; Figure 2 A top view of a lightweight aluminum alloy die-casting mold horizontal reverse force dynamic balancing demolding device; Figure 3 Internal structure of the fixed mold for a dynamic balancing demolding device for horizontal reverse force of lightweight aluminum alloy die casting mold. Figure 1 ; Figure 4 A dynamic balancing demolding device for horizontal reverse force of lightweight aluminum alloy die casting mold. Figure 3 Enlarged view of point A in the middle; Figure 5 Internal structure of the fixed mold for a dynamic balancing demolding device for horizontal reverse force of lightweight aluminum alloy die casting mold. Figure 2 ; Figure 6 A cross-sectional view of the accumulator cover of a dynamic balancing demolding device for horizontal reverse force of a lightweight aluminum alloy die-casting mold. Figure 7 A dynamic balancing demolding device for horizontal reverse force of lightweight aluminum alloy die casting mold. Figure 6 Enlarged view at point B in the middle; Figure 8 This is a flowchart illustrating the motion state of the ejector piston and the reverse ejector piston in a dynamic balancing demolding device for horizontal reverse force of a lightweight aluminum alloy die-casting mold.

[0019] In the picture: 1. Fixed mold; 2. Mold core; 3. Slider; 4. Positioning hole; 5. Positioning seat; 6. Connecting arm; 7. Positioning cylinder; 8. Extrusion piston; 9. Pressure rod; 10. Pressure plate; 11. Mounting hole; 12. Limiting hole; 13. Power storage cover; 14. Fixed seat; 15. Electric push rod; 16. Top plate; 17. Ejector rod; 18. Slide plate; 19. Limiting rod; 20. Limiting spring; 21. Limiting seat; 22. Connecting cover; 23. Connecting rod; 24. Positioning piston; 25. Ejection chamber; 26. Reverse ejection chamber; 27. Outward expansion chamber; 28. Ejection piston; 29. ​​Synchronizing rod; 30. Pressure relief chamber; 31. Pressure relief hole; 32. Reverse ejection piston; 33. First pressure reduction chamber; 34. Second pressure reduction chamber; 35. Connecting pipe. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate the present invention.

[0021] Example 1: like Figures 1 to 8 As shown, a lightweight aluminum alloy die-casting mold with horizontal reverse force dynamic balancing demolding device includes a fixed mold 1 and a mold core 2 installed on the fixed mold 1.

[0022] The fixed mold 1 has a vertically inserted ejector rod 17 inside, which is used to eject the workpiece. The mold core 2 has a pressure plate 10 on top, which covers the workpiece and is used to push the end face of the workpiece. The fixed mold 1 has a power distribution assembly installed inside for distributing the power of the ejector rod 17 and the pressure plate 10. A power distribution assembly is equipped with a accumulator 13. The accumulator 13 has an ejector chamber 25 and a reverse ejector chamber 26 inside. An ejector piston 28 and a reverse ejector piston 32 are slidably arranged inside the ejector chamber 25 and the reverse ejector chamber 26, respectively, and move synchronously. The ejector chamber 25 has an expansion chamber 27. When the ejector piston 28 and the reverse ejector piston 32 move, the reverse ejector piston 32 moves to squeeze the chamber and drive the pressure plate 10 to press. When the reverse ejector piston 32 squeezes the air outlet, the ejector piston 28 moves from the expansion chamber 27 to the ejector chamber 25. When it continues to move, the ejector piston 28 continuously increases the pressure and drives the push rod 17 to move upward. The side wall of the reverse ejector piston 32 has a first pressure reducing chamber 33 and a second pressure reducing chamber 34. The volume of the first pressure reducing chamber 33 is smaller than the volume of the second pressure reducing chamber 34, and it is used to gradually reduce the reverse ejector pressure of the pressure plate 10 to adapt to actual operation. By using the synchronous movement of the ejector piston 28 and the anti-ejector piston 32, and the graded pressure reduction design of the first pressure reduction chamber 33 and the second pressure reduction chamber 34, the anti-ejector positioning effect of the pressure plate 10 is ensured, and the workpiece is accurately ejected by the ejector rod 17, avoiding uneven deformation of the workpiece and improving demolding stability.

[0023] like Figures 1 to 8 As shown, in a specific embodiment, four sliders 3 are installed at the four corners of the fixed mold 1. The sliders 3 are slidably mounted on the external components. Positioning holes 4 are provided on the top of each slider 3. The positioning holes 4 are used to position the external components and sliders 3 using locking bolts. By setting sliders 3 at the corners of the fixed mold 1 and using the positioning holes 4 in conjunction with the locking bolts for positioning, the device can be quickly fixed to the external components, improving the convenience and stability of the fixed mold 1 installation and ensuring the stability of the fixed mold 1 during demolding.

[0024] like Figures 1 to 8 As shown, a positioning seat 5 is further installed on the side wall of the fixed mold 1. A connecting arm 6 is rotatably mounted on the positioning seat 5. A positioning cylinder 7 is installed at the end of the connecting arm 6. A pressure rod 9 is movably inserted into the positioning cylinder 7. A pressure plate 10 is installed at the end of the pressure rod 9. Two mounting holes 11 at a 90-degree angle are opened on the positioning seat 5, and a limiting hole 12 is opened on the connecting arm 6. The limiting hole 12 and the mounting holes 11 are used to position the angle of the connecting arm 6 after rotation. With the rotational cooperation of the positioning seat 5 and the connecting arm 6, the position of the pressure plate 10 can be flexibly adjusted. Through the positioning effect of the mounting hole 11 and the limiting hole 12, the angle of the connecting arm 6 can be accurately fixed, ensuring that the pressure plate 10 accurately covers the end face of the workpiece and adapts to the pre-pressing requirements under different working conditions.

[0025] like Figures 1 to 8As shown, furthermore, a connecting pipe 35 is connected to the accumulator 13, and the connecting pipe 35 is interconnected with the air outlet on the anti-top cavity 26. The connecting pipe 35 also movably penetrates the side wall of the fixed mold 1, and the end of the connecting pipe 35 is interconnected with the inner cavity of the positioning cylinder 7. A compression piston 8 is slidably arranged inside the positioning cylinder 7, and the end of the compression piston 8 is interconnected with the pressure rod 9. The air passage between the accumulator 13 and the positioning cylinder 7 is connected through the connecting pipe 35. With the transmission of the compression piston 8 and the pressure rod 9, the pressure in the anti-top cavity 26 can be stably transmitted to the pressure plate 10, ensuring the uniformity and stability of the anti-top force of the pressure plate 10 and improving the force transmission efficiency.

[0026] Example 2: The difference between the above embodiments and this embodiment is that: Figures 1 to 8 As shown, a fixed base 14 is welded to the outside of the accumulator 13. The bottom of the fixed base 14 is bolted to the side wall of the fixed mold 1. An electric push rod 15 is installed on the side wall of the fixed mold 1. The output end of the electric push rod 15 movably passes through the accumulator 13 and the fixed mold 1. A synchronizing rod 29 is installed between the ejector piston 28 and the anti-ejector piston 32, and the synchronizing rod 29 movably passes through the partition plate used to divide the ejector cavity 25 and the anti-ejector cavity 26. The fixed base 14 can firmly fix the accumulator 13 to the fixed mold 1. The electric push rod 15 drives the ejector piston 28 and the anti-ejector piston 32 to move synchronously through the synchronizing rod 29, ensuring the consistency of the two piston movements, improving the accuracy of power transmission, and simplifying the drive structure design.

[0027] like Figures 1 to 8 As shown, in a specific embodiment, a top plate 16 is installed inside the fixed mold 1. Several pairs of ejector rods 17 are movably installed through the top plate 16. Four limiting seats 21 are installed on the fixed mold 1. The ends of the four limiting seats 21 are attached to the bottom of the top plate 16, and the limiting seats 21 are used to limit the position of the top plate 16. A sliding plate 18 is installed on the side wall of the top plate 16. A limiting rod 19 is installed through the sliding plate 18. Both ends of the limiting rod 19 are installed on the side wall of the fixed mold 1. A limiting spring 20 is sleeved on the outer side wall of the limiting rod 19. One end of the limiting spring 20 is engaged with the side wall of the sliding plate 18, and the other end of the limiting spring 20 is engaged with the fixed mold 1. The top plate 16 can drive multiple pairs of ejector rods 17 to eject synchronously, ensuring uniform force on the workpiece. The limiting seats 21 can accurately limit the reset position of the top plate 16. The limiting rods 19 and the limiting springs 20 cooperate to guide the top plate 16 to move smoothly, avoid the top plate 16 from deviating, and improve the stability of the ejection and reset actions.

[0028] like Figures 1 to 8As shown, a connecting cover 22 is further installed on the accumulator shroud 13. The connecting cover 22 is interconnected with the ejection chamber 25. A connecting rod 23 is movably installed inside the connecting cover 22. The top of the connecting rod 23 is connected to the bottom of the top plate 16. A positioning piston 24 is installed at the bottom of the connecting rod 23. The positioning piston 24 is slidably disposed on the side wall of the connecting cover 22. The diameter of the outer expansion cavity 27 is larger than the diameter of the ejection chamber 25. The connecting cover 22, the connecting rod 23, and the positioning piston 24 constitute a stable transmission structure, which can effectively transmit the pressure in the ejection chamber 25 to the top plate 16. The diameter design of the outer expansion cavity 27 can realize the gradual increase of the ejection pressure, avoid sudden changes in the ejection force of the ejector rod 17 that could damage the workpiece, and ensure that the ejection process is stable and controllable.

[0029] Example 3: The difference between the above embodiments and this embodiment is that: Figures 1 to 8 As shown, a pressure relief chamber 30 is provided at the end of the anti-ejection cavity 26, and the diameter of the pressure relief chamber 30 is larger than that of the anti-ejection cavity 26. A pressure relief hole 31 is provided at the bottom of the pressure relief chamber 30. The large diameter design of the pressure relief chamber 30, combined with the pressure relief hole 31, can quickly release the pressure in the anti-ejection cavity 26 after demolding, which facilitates the rapid reset of the anti-ejection piston 32, improves the efficiency of the device's cyclic operation, and avoids residual pressure affecting subsequent operations.

[0030] This invention also discloses a method for dynamically balancing horizontal reverse force in lightweight aluminum alloy die-casting molds for demolding, the steps of which are as follows: Step 1: Initial standby preparation. After the aluminum alloy workpiece is die-cast into shape on the mold core 2 of the fixed mold 1, the device is reset to the initial state. Step 2: Pre-press positioning of the pressure plate. Drive the connecting arm 6 on the positioning seat 5 to rotate, so that the positioning cylinder 7 at the end of the connecting arm 6 drives the pressure rod 9 and the pressure plate 10 to rotate synchronously until the pressure plate 10 accurately covers and fits the end face of the workpiece, thus completing the pre-press positioning of the pressure plate 10. Step 3: The dual-piston synchronous drive starts the electric push rod 15 on the side wall of the fixed mold 1. Its output end pushes the synchronous rod 29 to move. The synchronous rod 29 drives the ejector piston 28 and the anti-ejector piston 32 to slide synchronously and in the same direction along the ejector cavity 25 and the anti-ejector cavity 26. The anti-ejector piston 32 squeezes the gas in the anti-ejector cavity 26. The high-pressure gas is transported to the inner cavity of the positioning cylinder 7 through the connecting pipe 35, which pushes the extrusion piston 8 to drive the pressure rod 9 to extend, so that the pressure plate 10 applies horizontal reverse pressure to press the end face of the workpiece. Step 4: Dynamic Ejection. After the reverse piston 32 slides to block the air outlet of the reverse ejection chamber 26, the ejection piston 28 enters the ejection chamber 25 from the outer expansion chamber 27. With the continuous thrust of the electric push rod 15, the pressure in the ejection chamber 25 gradually increases. Through the connecting cover 22, the positioning piston 24 and the connecting rod 23 are pushed, causing the top plate 16 to move upward along the limit rod 19. The top plate 16 drives the ejector rod 17 to extend and push the workpiece. At this time, the reverse pressure of the pressure plate 10 and the ejection force of the ejector rod 17 form a horizontal dynamic balance. During the ejection process, the first pressure-reducing chamber 33 on the side wall of the reverse piston 32 is first connected to the connecting pipe 35 to gradually reduce the reverse pressure. After the workpiece is further separated from the mold core 2, the second pressure-reducing chamber 34 is connected to the connecting pipe 35, and the reverse pressure is further weakened to meet the force requirements of the workpiece. Step 5: The device resets in a cycle. After the workpiece is completely ejected, the electric push rod 15 is driven to reset in the reverse direction.

[0031] The implementation principle of the lightweight aluminum alloy die-casting mold horizontal reverse force dynamic balancing demolding device of the present invention is as follows: After the aluminum alloy workpiece is die-cast on the mold core 2 of the fixed mold 1, the device is in the initial standby state. At this time, the ejector rod 17 retracts into the interior of the fixed mold 1, the pressure plate 10 maintains a preset distance from the end face of the workpiece, the ejector piston 28 is located in the outer expansion cavity 27 of the accumulator shroud 13, the reverse ejector piston 32 is in the initial position of the reverse ejector cavity 26, and the limit spring 20 is in the naturally extended state, forming a stable limit on the top plate 16, ensuring that the positions of each component are accurately reset, and preparing for the demolding operation.

[0032] When the demolding program is started, the connecting arm 6 installed on the positioning seat 5 is first driven to rotate. The connecting arm 6 rotates around the positioning seat 5 to a preset angle. The limiting hole 12 on the connecting arm 6 is matched with the corresponding mounting hole 11 on the positioning seat 5 for positioning. The bolts are then used to lock the connection. Finally, the positioning cylinder 7 at the end of the connecting arm 6 drives the pressure rod 9 and the pressure plate 10 to rotate synchronously until the pressure plate 10 accurately covers and adheres to the end face of the workpiece, completing the pre-pressing positioning.

[0033] Subsequently, the electric push rod 15 installed on the side wall of the fixed mold 1 starts to move, and its output end pushes the synchronous rod 29 to move. Since the synchronous rod 29 passes through the partition between the ejection cavity 25 and the anti-ejection cavity 26, and its two ends are fixedly connected to the ejection piston 28 and the anti-ejection piston 32 respectively, it can drive the ejection piston 28 and the anti-ejection piston 32 to slide synchronously and in the same direction along their respective cavities.

[0034] When the anti-top piston 32 slides in the anti-top cavity 26, it will squeeze the gas filled in the cavity, causing the pressure in the anti-top cavity 26 to rise. The high-pressure gas is delivered to the inner cavity of the positioning cylinder 7 through the connecting pipe 35, pushing the extrusion piston 8 in the positioning cylinder 7 to slide along the cavity wall. The extrusion piston 8 then drives the pressure rod 9 to extend synchronously, increasing the horizontal reverse pressure of the pressure plate 10, strengthening the anti-top positioning effect on the end face of the workpiece, and preventing the workpiece from deforming due to horizontal displacement during the subsequent ejection process from the source.

[0035] As the electric push rod 15 continuously outputs thrust, the ejector piston 28 gradually enters the ejector cavity 25 from the outer expansion cavity 27. When it slides inside the ejector cavity 25, the pressure inside the ejector cavity 25 gradually increases. At this time, the high-pressure gas inside is transmitted to the positioning piston 24 through the connecting cover 22, pushing the positioning piston 24 to drive the connecting rod 23 to move upward. The top of the connecting rod 23 is connected to the bottom of the top plate 16, thereby driving the top plate 16 to slide upward along the limiting rod 19. Several pairs of ejector rods 17 installed on the top plate 16 extend synchronously, applying an ejection force to the bottom of the workpiece. At this time, the reverse pressure applied by the pressure plate 10 and the ejection force of the ejector rods 17 form a dynamic balance in the horizontal direction, effectively offsetting the lateral sticking force and scraping force generated between the workpiece and the mold core 2 during the ejection process. Furthermore, as the ejector piston 28 moves, the ejection pressure gradually increases, thereby driving the workpiece to move gradually.

[0036] During the continuous ejection of the workpiece by the ejector rod 17, the reverse ejector piston 32 continues to slide along the reverse ejector cavity 26. The first pressure-reducing cavity 33 opened on its side wall is first connected to the channel of the connecting pipe 35, so that the pressure inside the connecting pipe 35 gradually decreases and moves. The reverse pressure applied by the pressure plate 10 decreases synchronously, which is adapted to the force requirements of the workpiece gradually separating from the mold core 2. When the workpiece further separates from the mold core 2, the second pressure-reducing cavity 34 on the reverse ejector piston 32 is connected to the connecting pipe 35. Since the volume of the second pressure-reducing cavity 34 is larger than that of the first pressure-reducing cavity 33, the pressure inside the reverse ejector cavity 26 of the connecting pipe 35 is further reduced. The reverse pressure of the pressure plate 10 is gradually weakened, which not only ensures the horizontal force balance throughout the ejection process, but also avoids excessive reverse pressure causing squeezing damage to the shape of the workpiece.

[0037] Finally, the workpiece is ejected. The operator drives the electric push rod 15 to reset. Finally, the anti-ejection piston 32 slides into the pressure relief chamber 30 at the end of the anti-ejection cavity 26. The diameter of the pressure relief chamber 30 is larger than that of the anti-ejection cavity 26, so that the pressure in the cavity is released quickly. The compression piston 8 and the pressure rod 9 are reset manually. The ejection piston 28 is reset, the pressure in the ejection cavity 25 disappears, and the top plate 16 slides down along the limit rod 19 under the elastic tension of the limit spring 20. The ejector rod 17 retracts into the fixed mold 1. The limit seat 21 limits the bottom of the top plate 16, ensuring that the top plate 16 is reset to the initial position, completing a complete dynamic balance demolding operation, and waiting for the next round of demolding cycle after die casting.

[0038] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A lightweight aluminum alloy die casting mold horizontal reverse force dynamic balance demolding device, comprising a fixed mold (1) and a mold core (2) installed on the fixed mold (1), characterized in that: a top rod (17) is vertically inserted and arranged inside the fixed mold (1), and the top rod (17) is used for ejecting a workpiece; a pressing plate (10) is arranged on the top of the mold core (2), and the pressing plate (10) covers the workpiece, and the pressing plate (10) is used for counter-ejecting the end face of the workpiece; a power distribution assembly for distributing the driving power of the top rod (17) and the pressing plate (10) is installed inside the fixed mold (1); a force storage cover (13) is installed on the power distribution assembly, a ejection cavity (25) and a counter-ejection cavity (26) are formed in the force storage cover (13), an ejection piston (28) and a counter-ejection piston (32) that move synchronously are slidably arranged in the ejection cavity (25) and the counter-ejection cavity (26), respectively, the ejection cavity (25) is provided with an expansion cavity (27), when the ejection piston (28) and the counter-ejection piston (32) move, the counter-ejection piston (32) moves to press the chamber to drive the pressing plate (10) to press, and when the counter-ejection piston (32) is pressed at the gas outlet, at this time the ejection piston (28) moves from the expansion cavity (27) to the ejection cavity (25), when it continues to move, the ejection piston (28) continuously increases the pressure to drive the top rod (17) to move upwards, and a first pressure reduction cavity (33) and a second pressure reduction cavity (34) are formed in the side wall of the counter-ejection piston (32), the volume of the first pressure reduction cavity (33) is smaller than the volume of the second pressure reduction cavity (34), and the first pressure reduction cavity (33) is used for gradually reducing the counter-ejection pressure of the pressing plate (10), and is adapted to actual operation. Four sliders (3) are installed at four corners of the fixed mold (1), the sliders (3) are slidably arranged on an external member, positioning holes (4) are formed in the top of the sliders (3), and the positioning holes (4) are used for positioning the external member and the sliders (3) through locking bolts.

2. The horizontal counterforce dynamic balancing ejection device for light-weighted aluminum alloy die casting mold according to claim 1, characterized in that, A positioning seat (5) is installed on the side wall of the fixed mold (1), a connecting arm (6) is rotatably installed on the positioning seat (5), a positioning cylinder (7) is installed at the end of the connecting arm (6), a pressing rod (9) is movably inserted into the positioning cylinder (7), and a pressing plate (10) is installed at the end of the pressing rod (9); two mounting holes (11) that are ninety degrees apart are formed in the positioning seat (5), and a limiting hole (12) is formed in the connecting arm (6), and the limiting hole (12) and the mounting holes (11) are used for positioning the angle of the connecting arm (6) after rotation.

3. The horizontal counterforce dynamic balancing ejection device for light-weighted aluminum alloy die casting mold according to claim 1, characterized in that, A communication pipe (35) is connected to the force storage cover (13), the communication pipe (35) and the gas outlet on the counter-ejection cavity (26) are in communication with each other, the communication pipe (35) movably penetrates the side wall of the fixed mold (1), the end of the communication pipe (35) and the inner cavity of the positioning cylinder (7) are in communication with each other, an extrusion piston (8) is slidably arranged in the positioning cylinder (7), and the end of the extrusion piston (8) and the pressing rod (9) are connected with each other.

4. The horizontal counterforce dynamic balance demolding device for light-weighted aluminum alloy die casting mold according to claim 3, characterized in that, ​ 5. The horizontal counterforce dynamic balancing ejection device for light-weighted aluminum alloy die casting mold according to claim 1, characterized in that, The fixed seat (14) bottom is installed on the fixed mold (1) side wall through bolts, the fixed mold (1) side wall is installed with an electric push rod (15), the electric push rod (15) output end is movably penetrated through the force storage cover (13) and the fixed mold (1), a synchronous rod (29) is installed between the ejection piston (28) and the counter-ejection piston (32), and the synchronous rod (29) is movably penetrated through the partition plate for dividing the ejection cavity (25) and the counter-ejection cavity (26).

6. The horizontal counterforce dynamic balancing ejection device for light-weighted aluminum alloy die casting mold according to claim 1, characterized in that, The fixed mold (1) is internally installed with a top plate (16), a plurality of pairs of ejection rods (17) are movably penetrated and installed on the top plate (16), four limiting seats (21) are installed on the fixed mold (1), the four limiting seats (21) end portions are attached to the top plate (16) bottom, and the limiting seat (21) is used for limiting the position of the top plate (16).

7. The horizontal counterforce dynamic balancing ejection device for light-weighted aluminum alloy die casting mold according to claim 6, characterized in that, The top plate (16) side wall is installed with a sliding plate (18), a limiting rod (19) is penetrated and installed on the sliding plate (18), the limiting rod (19) two ends are installed on the fixed mold (1) side wall, a limiting spring (20) is sleeved and arranged on the limiting rod (19) outer side wall, one end of the limiting spring (20) is clamped on the sliding plate (18) side wall, and the other end of the limiting spring (20) is clamped on the fixed mold (1).

8. The horizontal counterforce dynamic balancing ejection device for light-weighted aluminum alloy die casting mold according to claim 6, characterized in that, The force storage cover (13) is installed with a connecting cover (22), the connecting cover (22) is in communication with the ejection cavity (25), a connecting rod (23) is movably penetrated and installed in the connecting cover (22), the connecting rod (23) top is connected with the top plate (16) bottom, a positioning piston (24) is installed at the connecting rod (23) bottom, the positioning piston (24) is slidably arranged on the connecting cover (22) side wall, and the expanding cavity (27) diameter is greater than the ejection cavity (25) diameter.

9. The horizontal counterforce dynamic balancing ejection device for light-weighted aluminum alloy die casting mold according to claim 1, characterized in that, The counter-ejection cavity (26) end portion is provided with a pressure relief cavity (30), the pressure relief cavity (30) diameter is greater than the counter-ejection cavity (26) diameter, and the pressure relief cavity (30) bottom is provided with a pressure relief hole (31).

10. A lightweight aluminum alloy die casting mold horizontal counterforce dynamic balance demolding method, characterized by, The horizontal counterforce dynamic balance demolding device for the light-weight aluminum alloy die-casting mold according to any one of claims 1-9 or the horizontal counterforce dynamic balance demolding method is used, and the steps are as follows: Step one: initial standby preparation, after the aluminum alloy workpiece is die-cast and formed on the mold core (2) of the fixed mold (1), the device is reset to the initial state; Step two: pre-pressing and positioning of the pressing plate, the connecting arm (6) on the positioning seat (5) is driven to rotate, the positioning cylinder (7) at the end of the connecting arm (6) drives the pressing rod (9) and the pressing plate (10) to rotate synchronously, until the pressing plate (10) accurately covers and attaches to the end surface of the workpiece, and the pre-pressing and positioning of the pressing plate (10) is completed; Step three: double piston synchronous drive, start the electric push rod (15) of the fixed mold (1) side wall, its output end pushes the synchronous rod (29) to move, the synchronous rod (29) drives the ejection piston (28) and the reverse ejection piston (32) to slide along the ejection cavity (25) and the reverse ejection cavity (26) synchronously and in the same direction; the reverse ejection piston (32) extrudes the gas in the reverse ejection cavity (26), the high-pressure gas is delivered to the inner cavity of the positioning cylinder (7) through the communication pipe (35), pushes the extrusion piston (8) to drive the pressure rod (9) to extend, so that the pressure plate (10) exerts a horizontal reverse pressure to compress the end face of the workpiece; Step four: dynamic balance ejection, after the reverse ejection piston (32) slides to block the gas outlet of the reverse ejection cavity (26), the ejection piston (28) enters the ejection cavity (25) from the outer expansion cavity (27), with the continuous thrust of the electric push rod (15), the pressure in the ejection cavity (25) gradually increases, drives the positioning piston (24) through the connecting cover (22), the connecting rod (23) drives the top plate (16) to move upward along the limiting rod (19), the top plate (16) drives the top rod (17) to extend and push the workpiece, at this time the reverse pressure of the pressure plate (10) and the ejection force of the top rod (17) form a horizontal dynamic balance; during the ejection process, the first pressure reduction cavity (33) on the side wall of the reverse ejection piston (32) is first communicated with the communication pipe (35), the reverse pressure is gradually reduced, after the workpiece is further separated from the mold core (2), the second pressure reduction cavity (34) is communicated with the communication pipe (35), the reverse pressure is further reduced, and the force requirement of the workpiece is adapted; Step five: device reset cycle, after the workpiece is completely ejected, the electric push rod (15) is driven to reset reversely.

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