A pressurizing mechanism applied to magnesium alloy integrated die casting

Abstract

This invention relates to the field of magnesium alloy integral die casting technology, and discloses a pressure-applying mechanism for magnesium alloy integral die casting, including a mold frame. A lower mold base is fixedly connected to the top of the mold frame, and an upper mold base is provided on the upper side of the lower mold base. A vacuuming mechanism is provided on the top of the lower mold base, and the vacuuming mechanism includes multiple lower suction boxes, all of which are fixedly connected to the top of the lower mold base. A corrugated groove is fixedly connected to the top of each lower suction box, and a notch is provided on one side of the top of each lower suction box. Multiple upper suction boxes are fixedly connected to the bottom of the upper mold base. This invention achieves rapid, high-flow-rate vacuuming in the initial stage of vacuuming through the notch, holes, and suction ports. Furthermore, by activating a cylinder to move a wedge block, the wedge surfaces of wedge block one and wedge block two are engaged to force the movable plate downwards to reduce the gap, ensuring efficient vacuuming in the early stages and preventing molten metal from entering the vacuuming equipment during die casting.

Description

Technical Field

[0001] This invention relates to the field of magnesium alloy integral die casting technology, and in particular to a pressure mechanism applied to magnesium alloy integral die casting. Background Technology

[0002] Magnesium alloys, as the lightest practical metal structural material currently available, are widely used in automobile manufacturing, aerospace, 3C electronic products, and rail transportation. They are an ideal material for achieving product lightweighting. With the continuous development of industrial technology, the traditional manufacturing of magnesium alloy parts usually involves casting multiple small structural parts and then assembling them by welding, riveting, and other methods. The traditional method not only involves numerous processing and assembly steps and low production efficiency, but the presence of joints also adds extra weight and is prone to stress concentration under load, reducing the rigidity and strength of the overall structure. Therefore, existing magnesium alloy parts are mainly manufactured using integrated die casting technology.

[0003] In the process of integral die casting of magnesium alloys, due to the large volume and complex structure of the mold cavity, a vacuum mechanism is usually required to pressurize and vent the mold cavity to avoid defects such as porosity and shrinkage cavities inside the die casting. One existing venting structure for integral die casting of magnesium alloys typically involves directly creating venting grooves on the mold and connecting a vacuum pump for venting. However, magnesium alloys have a low heat capacity and extremely fast solidification rate. If the diameter of the venting groove is small, the vacuuming speed cannot keep up with the filling speed of the molten metal, and the gas inside the cavity cannot be expelled in time. To solve this problem of slow venting, existing technologies typically use a corrugated venting block with a fixed gap at the venting end, utilizing the corrugated groove... The larger gap in the wave pattern allows for rapid evacuation, while the wave shape increases the flow resistance of the molten metal, causing it to cool and solidify before reaching the vacuum equipment. However, the filling speed and injection pressure of magnesium alloy integral die casting are extremely fast. If the gap of the wave venting block is set too large to ensure rapid evacuation of the large cavity, the high-speed and high-pressure magnesium alloy molten metal will break through the obstruction of the wave groove at the end of the die casting process and splash directly into the vacuum equipment, causing damage to the expensive vacuum pump or blockage of the pipeline. Conversely, if the gap of the wave groove is set small enough to block the molten metal, the vacuum efficiency in the early stage will be greatly reduced, failing to meet the process requirements of rapid venting in integral die casting. Summary of the Invention

[0005] The purpose of this invention is to provide a pressurizing mechanism for integral die casting of magnesium alloys, which solves the problem that the existing fixed-gap exhaust structure cannot simultaneously handle the large flow rate and rapid vacuuming in the early stage and the reliable blocking of molten metal in the later stage, resulting in low pumping efficiency or molten metal entering and damaging the vacuuming equipment.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A pressure mechanism for integral die casting of magnesium alloy includes a mold frame, a lower mold base fixedly connected to the top of the mold frame, an upper mold base provided on the upper side of the lower mold base, a vacuuming mechanism provided on the top of the lower mold base, an ejection mechanism provided on the upper side of the mold frame, and a processing mechanism provided on the outer side of the lower mold base.

[0008] The vacuuming mechanism includes multiple lower vacuum boxes, all of which are fixedly connected to the top of the lower mold base. The top of each lower vacuum box is fixedly connected with a corrugated groove, and a notch is provided on one side of the top of each lower vacuum box. Multiple upper vacuum boxes are fixedly connected to the bottom of the upper mold base. A movable plate is provided on the bottom inner side of each upper vacuum box. A corrugated groove is provided on the bottom of the movable plate, and a hole is provided on the bottom of the movable plate. An air extraction port is connected to one side of the outer wall of each upper vacuum box, and an adjustment component is provided on the inner side of each upper vacuum box.

[0009] Through the above technical solution, the cylinder pushes the first wedge block to move, and the wedge surfaces of the first and second wedge blocks cooperate to force the movable plate to move down to reduce the gap, ensuring the efficiency of vacuuming in the early stage, and effectively preventing molten metal from entering the vacuuming equipment during die casting, thus avoiding equipment damage.

[0010] Preferably, the ejection mechanism includes a base plate, which is fixedly connected to the inner bottom of the mold frame. Support rods are fixedly connected to all four sides of the inner bottom of the mold frame. A pin plate is slidably connected to the outer side of the support rods. A second spring is sleeved on the lower side of the outer wall of the support rod. The top of the second spring abuts against the pin plate. Multiple ejector pins are fixedly connected to the top of the pin plate. The multiple ejector pins pass through the corresponding lower mold base and lower air extraction box. Connecting plates are fixedly connected to the front and rear ends of the left and right sides of the pin plate. The outer side of the connecting plate passes through the mold frame. Push rods are fixedly connected to the front and rear ends of the left and right sides of the upper mold base. The bottom of the push rods contacts the connecting plate.

[0011] With the above technical solution, the upper mold base drives the push rod to move, and the spring will push the needle plate to move, thereby driving the ejector pin to insert. This can push the magnesium alloy product out of the lower mold base after the die casting is completed, and at the same time facilitate subsequent part removal and cleaning operations.

[0012] Preferably, the processing mechanism includes multiple supports, which are respectively fixedly connected to the outer periphery of the lower mold base. A hydraulic cylinder is fixedly connected to the outer side of the support. The output end of the hydraulic cylinder passes through the support and is fixedly connected to a back plate. The back plate is slidably connected to the support, and an insert is fixedly connected to one side of the back plate.

[0013] The above technical solution can form the cavity required for die casting and facilitate the separation of the insert from the product after die casting is completed.

[0014] Preferably, the adjusting component includes a cylinder, which is fixedly connected to one side of the outer wall of the upper suction box. The output end of the cylinder passes through the upper suction box and is fixedly connected to a wedge block one. A wedge block two is fixedly connected to the top of the movable plate, and the wedge block two is in contact with the wedge block one.

[0015] The above technical solution can drive the movable plate to move, thereby adjusting the gap between the wave groove and the wave convex groove.

[0016] Preferably, the vacuuming mechanism further includes a fixing rod, which is fixedly connected to the inner side of the upper vacuum box. The outer side of the fixing rod is slidably connected to the movable plate. A spring is provided on the upper side of the outer wall of the fixing rod, and the bottom of the spring abuts against the movable plate.

[0017] The above technical solution can guide and reset the movement of the movable plate, thereby ensuring that the adjustment process proceeds normally.

[0018] Preferably, positioning posts are fixedly connected to the four corners of the top of the lower mold base, and positioning holes are opened at the four corners of the bottom of the upper mold base, with the positioning holes being inserted into the positioning posts.

[0019] The above technical solution can be used to position the upper mold base and the lower mold base, thereby ensuring accurate mold closing position.

[0020] Preferably, the ejection mechanism further includes multiple guide rods, which are fixedly connected to the top periphery of the mold frame, and the outer sides of the guide rods are slidably connected to the needle plate.

[0021] The above technical solution can guide the movement of the needle plate, thereby keeping multiple ejector pins stable when they move upward.

[0022] Preferably, the processing mechanism further includes multiple guide pillars, which are respectively fixedly connected to the top of the corresponding back plate. The bottom of the upper mold base is provided with multiple guide holes, which are inserted into the guide pillars.

[0023] The above technical solution can restrict the position of the back plate when the upper mold base is pressed down, thereby reducing the displacement of the insert.

[0024] Preferably, the top of the upper mold base is provided with a pouring gate, and the bottom of the pouring gate is connected to the inner side of the upper mold base.

[0025] The above technical solution enables the magnesium alloy liquid to be introduced into the mold cavity, thereby completing the feeding process before die casting.

[0026] Preferably, the inner wall surface contour of the wave groove is adapted to the outer wall surface contour of the wave convex groove, the bottom end of the hole is connected to the inner side of the wave groove, and the inner cavity of the upper air extraction box is connected to the lower space of the movable plate through the hole.

[0027] The above technical solution can form an air extraction channel and facilitate the discharge of gas from the mold cavity.

[0028] In summary, the present invention has at least one of the following beneficial technical effects:

[0029] 1. This invention utilizes a spring to pull a movable plate along a fixed rod during the initial vacuuming stage, creating a large gap between the wavy groove and the wavy convex groove. This allows for rapid, high-flow-rate vacuuming through the notch, holes, and extraction port. Just before die casting begins, a cylinder is activated to move a wedge block, and the wedge surfaces of wedge block one and wedge block two engage to force the movable plate downwards, reducing the gap. This ensures efficient vacuuming in the early stages while effectively preventing molten metal from entering the vacuuming equipment during die casting, thus avoiding equipment damage.

[0030] 2. This invention uses the upper mold base to drive the push rod to move upward, and the spring will push the pin plate to move upward, causing multiple ejector pins to pass through the lower mold base and the lower vacuum box respectively. This not only ejects the formed magnesium alloy product, but also some ejector pins can eject the excess metal waste remaining on the top of the corrugated groove, realizing the synchronous demolding of the product and the waste in the runner. This facilitates the collection of the product and the cleaning of the gaps inside the vacuum mechanism by the staff.

[0031] 3. This invention uses a hydraulic cylinder to push the back plate and inserts inward to form a die-casting cavity. When the upper mold base is pressed down, it engages with the guide post to apply locking pressure to the back plate, preventing the inserts from shifting under the high pressure of the magnesium alloy die-casting process. At the same time, the positioning post on the lower mold base engages with the upper mold base for positioning, ensuring the accuracy of mold closure and the stability of the die-casting structure. Attached Figure Description

[0032] Figure 1 This is a perspective view of the present invention;

[0033] Figure 2 This is a partial structural breakdown diagram of the present invention;

[0034] Figure 3 This is a partial structural illustration of the present invention;

[0035] Figure 4 This is a partial structural exploded view of the vacuum pumping mechanism of the present invention;

[0036] Figure 5 This is a partial structural cross-sectional view of the present invention;

[0037] Figure 6 This is a partial structural exploded view of the adjustment component of the present invention;

[0038] Figure 7 This is a partial structural schematic diagram of the ejection mechanism of the present invention;

[0039] Figure 8 This is a partial structural exploded view of the ejection mechanism of the present invention;

[0040] Figure 9 This is a partial structural diagram of the present invention;

[0041] Figure 10 This is a partial structural schematic diagram of the processing mechanism of the present invention.

[0042] The components are as follows: 1. Mold base; 2. Vacuuming mechanism; 21. Lower vacuum box; 22. Wavy groove; 23. Notch; 24. Upper vacuum box; 25. Movable plate; 26. Wavy groove; 27. Hole; 28. Vacuum port; 29. ​​Adjustment component; 291. Cylinder; 292. Wedge block one; 293. Wedge block two; 294. Fixing rod; 295. Spring one; 3. Ejection mechanism; 31. Base plate; 32. Needle plate; 33. Ejector pin; 34. Guide rod; 35. Support rod; 36. Spring two; 37. Connecting plate; 38. Push rod; 4. Machining mechanism; 41. Bracket; 42. Hydraulic cylinder; 43. Back plate; 44. Insert; 45. Guide post; 5. Lower mold base; 6. Upper mold base; 7. Sprue; 8. Positioning post. Detailed Implementation

[0043] The following is in conjunction with the appendix Figure 1 - Appendix Figure 10 The present invention will be further described in detail below.

[0044] The present invention provides a pressure mechanism for integral die casting of magnesium alloy, including a mold frame 1, a lower mold base 5 fixedly connected to the top of the mold frame 1, an upper mold base 6 provided on the upper side of the lower mold base 5, a vacuuming mechanism 2 provided on the top of the lower mold base 5, an ejection mechanism 3 provided on the upper side of the mold frame 1, and a processing mechanism 4 provided on the outer side of the lower mold base 5.

[0045] The vacuuming mechanism 2 includes multiple lower vacuum boxes 21, all of which are fixedly connected to the top of the lower mold base 5. A corrugated groove 22 is fixedly connected to the top of each lower vacuum box 21. A notch 23 is provided on one side of the top of each lower vacuum box 21. Multiple upper vacuum boxes 24 are fixedly connected to the bottom of the upper mold base 6. A movable plate 25 is provided on the bottom inner side of each upper vacuum box 24. A corrugated groove 26 and a hole 27 are provided on the bottom of the movable plate 25. An air extraction port 28 is connected to one side of the outer wall of each upper vacuum box 24. An adjusting component 29 is provided inside each upper vacuum box 24. The adjusting component 29 includes a cylinder 291, which is fixedly connected to one side of the outer wall of each upper vacuum box 24. The output end of the cylinder 291 passes through the upper vacuum box 24 and is fixedly connected to a wedge block 292. The cylinder 291 can push the wedge block 292 to move. The top of the 5 is fixedly connected to a wedge block 293, which is in contact with a wedge block 292. The wedge block 292 will push the wedge block 293 to move. The vacuum mechanism 2 also includes a fixed rod 294, which is fixedly connected to the inner side of the upper vacuum box 24. The outer side of the fixed rod 294 is slidably connected to the movable plate 25. A spring 295 is provided on the upper side of the outer wall of the fixed rod 294. The bottom of the spring 295 abuts against the movable plate 25. The top of the upper mold base 6 is provided with a pouring port 7. The bottom of the pouring port 7 is connected to the inner side of the upper mold base 6. The pouring port 7 is used to pour magnesium alloy molten metal. The inner wall surface contour of the wave groove 26 is adapted to the outer wall surface contour of the wave protrusion 22. The bottom end of the hole 27 is connected to the inner side of the wave groove 26. The inner cavity of the upper vacuum box 24 is connected to the lower space of the movable plate 25 through the hole 27.

[0046] Specifically, when using a mold to perform integrated die casting of magnesium alloy, molten magnesium alloy can be injected into the mold cavity through the pouring port 7. Before die casting, external equipment pushes the upper mold base 6 downward, causing the upper mold base 6 and the lower mold base 5 to gradually close. As the upper mold base 6 descends, the upper vacuum box 24 also moves downward and presses against the top of the lower vacuum box 21. In the initial stage of vacuuming, the spring 295 drives the movable plate 25 to slide upward along the outside of the fixed rod 294, so that the movable plate 25 is in an upward state. At this time, a large gap is formed between the wave groove 26 at the bottom of the movable plate 25 and the wave protrusion 22 at the top of the lower vacuum box 21. A large amount of gas in the mold cavity can enter between the wave protrusion 22 and the wave groove 26 through the notch 23, and then be discharged through the hole 27 and the vacuum port 28. After the vacuum port 28 is connected to a vacuuming device, the gas in the cavity can be quickly pumped out.

[0047] When the vacuum level inside the mold reaches a high state and the die-casting filling and pressurization process begins, cylinder 291 is activated. The output end of cylinder 291 pushes wedge block 292 to move. Wedge block 292, through its inclined surface engagement with wedge block 293, drives wedge block 293 to push the movable plate 25 downward. This not only transforms the relatively small lateral thrust of cylinder 291 into a huge longitudinal resistance force through the mechanical friction self-locking between wedge block 292 and wedge block 293, resisting the instantaneous high back pressure impact unique to magnesium alloy integral die casting, preventing the movable plate 25 from being pushed open by the high-pressure molten metal, and ensuring the absolute stability of the exhaust channel dimensions, but also allows the wave groove 22 and... The mechanical gap between the wave grooves 26 is reduced, but a tiny gap is deliberately retained to ensure that the residual gas in the cavity can continue to be discharged in the final stage of the molten metal filling. When the high-speed flowing magnesium alloy liquid reaches the tiny wave gap, due to the low specific heat capacity and fast solidification of magnesium alloy, the tiny gap multiplies the contact area between the molten metal and the mold and forms a labyrinth resistance. The small amount of magnesium alloy liquid that rushes into the gap instantly generates a cooling effect and condenses rapidly, thereby forming a solid cold barrier layer in the tiny gap. The condensation of the molten metal itself achieves the self-sealing of the exhaust channel, providing double safety protection for the vacuum equipment. At the same time, the trace amount of waste material remaining between the wave grooves is pressed into an extremely thin brittle wave sheet.

[0048] During the mold opening and demolding stage after die casting, cylinder 291 returns, wedge block 292 removes the downward pressure on wedge block 293, and movable plate 25 slides upward instantly under the reset force of spring 295, so that the gap between the wave convex groove 22 and the wave groove 26 is reopened, releasing the clamping restraint on the internal chilled waste sheet. Since the space above has been freed up by movable plate 25, the bottom of the waste sheet remaining on the top of the wave convex groove 22 can be pushed by ejection mechanism 3. The waste sheet automatically breaks off from the root under the ejection action and is easily ejected, avoiding the stubborn problem of waste getting stuck in the narrow wave groove, saving the subsequent tedious process of cutting off the flow channel waste and mold cleaning operation.

[0049] The ejection mechanism 3 includes a base plate 31, which is fixedly connected to the inner bottom of the mold frame 1. Support rods 35 are fixedly connected to all four sides of the inner bottom of the mold frame 1. A needle plate 32 is slidably connected to the outer side of the support rods 35. A second spring 36 is sleeved on the lower side of the outer wall of the support rods 35. The top of the second spring 36 abuts against the needle plate 32. Multiple ejector pins 33 are fixedly connected to the top of the needle plate 32. The multiple ejector pins 33 pass through the corresponding lower mold base 5 and lower air extraction box 21. Connecting plates 37 are fixedly connected to the front and rear ends of the left and right sides of the needle plate 32. The outer side of the connecting plate 37 passes through the mold frame 1. Push rods 38 are fixedly connected to the front and rear ends of the left and right sides of the upper mold base 6. The bottom of the push rods 38 contacts the connecting plate 37. The ejection mechanism 3 also includes multiple guide rods 34, which are fixedly connected to the top four sides of the mold frame 1. The outer side of the guide rods 34 is slidably connected to the needle plate 32. The guide rods 34 can provide guidance for the movement of the needle plate 32.

[0050] Specifically, after die casting is completed, the upper mold base 6 moves upward, causing the upper evacuation box 24 to rise as well, thus revealing the formed magnesium alloy product from the mold. During this process, the cooled molten metal that has entered between the corrugated convex groove 22 and the corrugated recess 26 will remain at the top of the corrugated convex groove 22. As the upper mold base 6 moves, it also causes the push rod 38 to move upward, disengaging it from the connecting plate 37. Subsequently, the spring 2 36 pushes the needle plate 32 to slide upward on the outside of the support rod 35. The needle plate 32 continues to drive multiple ejector pins 33 to move upward synchronously, causing the ejector pins 33 to insert into the lower evacuation box 21, thereby ejecting the formed magnesium alloy product upward for easy removal later. At the same time, some ejector pins 33 will continue to pass through the lower evacuation box 21 to eject the magnesium alloy remaining at the top of the corrugated convex groove 22. This not only helps workers collect the die-cast magnesium alloy products but also facilitates the cleaning of the residual magnesium alloy between the corrugated convex groove 22 and the corrugated recess 26, reducing the difficulty of mold cleaning and providing conditions for the next die casting operation.

[0051] The processing mechanism 4 includes multiple supports 41, which are fixedly connected to the outer perimeter of the lower mold base 5. A hydraulic cylinder 42 is fixedly connected to the outer side of the support 41. The output end of the hydraulic cylinder 42 passes through the support 41 and is fixedly connected to a back plate 43. The back plate 43 is slidably connected to the support 41. An insert 44 is fixedly connected to one side of the back plate 43. The back plate 43 can drive the insert 44 to move. Multiple inserts 44 can be spliced ​​to form the cavity required for die casting. Positioning pins 8 are fixedly connected to the four corners of the top of the lower mold base 5. Positioning holes are opened at the four corners of the bottom of the upper mold base 6. The positioning holes are inserted into the positioning pins 8. The processing mechanism 4 also includes multiple guide pins 45, which are fixedly connected to the top of the corresponding back plate 43. Multiple guide holes are opened at the bottom of the upper mold base 6. The guide holes are inserted into the guide pins 45.

[0052] Specifically, before die casting, multiple hydraulic cylinders 42 first push the corresponding back plates 43 to slide inside the bracket 41. After the back plates 43 move, they drive multiple inserts 44 to move closer to the top center of the lower mold base 5, so that the multiple inserts 44 surround and form the die casting cavity required for the magnesium alloy product. After the cavity is formed, the upper mold base 6 presses down. At this time, the guide post 45 is inserted into the guide hole set at the bottom of the upper mold base 6. Since the guide post 45 is inclined, the upper mold base 6 can also apply pressure to the back plate 43 after moving into place, so that the multiple inserts 44 remain stable during the die casting process. To prevent displacement under pressure and ensure the stability of the cavity shape and die-casting dimensions, after the upper mold base 6 is inserted into place, multiple positioning pins 8 set on the top of the lower mold base 5 will be inserted into the corresponding positioning holes to ensure accurate matching position between the upper mold base 6 and the lower mold base 5. After die-casting is completed, the upper mold base 6 moves upward, and the hydraulic cylinder 42 pushes the back plate 43 to slide in the opposite direction, causing multiple inserts 44 to separate from the die-cast magnesium alloy product, so that the product is freed from the surrounding state, providing space for subsequent ejection operations, and facilitating the smooth removal of the die-cast magnesium alloy product.

[0053] Working principle:

[0054] When using a mold for integrated die casting of magnesium alloy, molten magnesium alloy can be injected into the mold cavity through the sprue 7. The vacuum mechanism 2 can extract the gas inside the mold cavity, achieving pressurization during die casting. During die casting, external equipment pushes the upper mold base 6 downwards, causing it to close with the lower mold base 5. The downward movement of the upper mold base 6 also causes the upper vacuum box 24 to descend, pressing it tightly against the top of the lower vacuum box 21. In the initial stage of vacuuming, spring 295 pulls the movable plate 25 upwards on the outside of the fixed rod 294, thereby moving the movable plate 25 upwards. This creates a large gap between the wave groove 26 at the bottom of the movable plate 25 and the wave protrusion 22 at the top of the lower vacuum box 21. At this time, the gas is released through the vacuum port 2. 8. When an external vacuum device is connected, the gas in the mold cavity can enter between the corrugated convex groove 22 and the corrugated groove 26 through the notch 23, and be extracted through the hole 27 and the air extraction port 28. Due to the large gap between the corrugated convex groove 22 and the corrugated groove 26, the vacuuming speed is fast. When the vacuum level inside the mold is high and die casting is required, the cylinder 291 is started. The output end of the cylinder 291 will push the wedge block 1 292 to move. Due to the wedge surface design of the contact surface between the wedge block 1 292 and the wedge block 293, when the wedge block 1 292 moves, the movable plate 25 can be pushed downward through the wedge block 293, thereby reducing the gap between the corrugated convex groove 22 and the corrugated groove 26, which can block the die casting material from passing through and prevent the die casting material from damaging the vacuum device.

[0055] After die casting is completed, the upper mold base 6 will move the upper vacuum box 24 upward, thereby exposing the finished magnesium alloy product. The cooled molten metal that has entered the area between the corrugated convex groove 22 and the corrugated recess 26 will remain on the top of the corrugated convex groove 22. When the upper mold base 6 moves, it will also move the push rod 38 upward, causing the push rod 38 to disengage from the connecting plate 37. Then, the spring 36 can push the needle plate 32 to slide upward on the outside of the support rod 35, thereby causing the ejector pin 33 to insert into the lower vacuum box 21, thereby ejecting the finished magnesium alloy product. Some of the ejector pins 33 will also pass through the lower vacuum box 21 to eject the magnesium alloy remaining on the top of the corrugated convex groove 22, which makes it convenient for workers to collect the magnesium alloy product and clean the magnesium alloy that has entered the area between the corrugated convex groove 22 and the corrugated recess 26.

[0056] Finally, before die casting, multiple hydraulic cylinders 42 push the corresponding back plates 43 to slide inside the bracket 41, thereby driving multiple inserts 44 to move to the top center of the lower mold base 5, so that the multiple inserts 44 surround to form the die casting cavity of the magnesium alloy product. Then, the upper mold base 6 is pressed down. At this time, the guide post 45 will be inserted into the guide hole opened at the bottom of the upper mold base 6. Due to the inclined setting of the guide post 45, the upper mold base 6 can also apply pressure to the back plate 43 after moving into place, so that the multiple inserts 44 will not be displaced due to pressure during die casting. After the upper mold base 6 is inserted into place, multiple positioning posts 8 on the top of the lower mold base 5 will be inserted into the corresponding positioning holes to ensure that the upper mold base 6 is accurately inserted. After die casting is completed, the upper mold base 6 rises. At this time, the hydraulic cylinders 42 will push the back plate 43 to move in the opposite direction, driving the inserts 44 to detach from the die-cast magnesium alloy product, which facilitates the ejection of the magnesium alloy product.

[0057] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A pressure mechanism for integral die casting of magnesium alloys, comprising a mold frame (1), characterized in that, The top of the mold frame (1) is fixedly connected to a lower mold base (5), an upper mold base (6) is provided on the upper side of the lower mold base (5), a vacuuming mechanism (2) is provided on the top of the lower mold base (5), an ejection mechanism (3) is provided on the upper side of the mold frame (1), and a processing mechanism (4) is provided on the outer side of the lower mold base (5). The vacuuming mechanism (2) includes multiple lower vacuum boxes (21), all of which are fixedly connected to the top of the lower mold base (5). The top of the lower vacuum box (21) is fixedly connected with a wave-shaped groove (22). A notch (23) is opened on one side of the top of the lower vacuum box (21). Multiple upper vacuum boxes (24) are fixedly connected to the bottom of the upper mold base (6). A movable plate (25) is provided on the bottom inner side of the upper vacuum box (24). A wave-shaped groove (26) is opened on the bottom of the movable plate (25). A hole (27) is opened on the bottom of the movable plate (25). An air extraction port (28) is connected to one side of the outer wall of the upper vacuum box (24). An adjustment component (29) is provided on the inner side of the upper vacuum box (24).

2. The pressure mechanism for integral die casting of magnesium alloy according to claim 1, characterized in that, The ejection mechanism (3) includes a base plate (31), which is fixedly connected to the bottom inner side of the mold frame (1). Support rods (35) are fixedly connected around the bottom inner side of the mold frame (1). A needle plate (32) is slidably connected to the outside of the support rods (35). A second spring (36) is sleeved on the lower outer wall of the support rods (35). The top of the second spring (36) abuts against the needle plate (32). A plurality of ejector pins (33) are fixedly connected to the top of the needle plate (32). The plurality of ejector pins (33) pass through the corresponding lower mold base (5) and lower air extraction box (21) respectively. A connecting plate (37) is fixedly connected to the front and rear ends of the left and right sides of the needle plate (32). The outside of the connecting plate (37) passes through the mold frame (1). A push rod (38) is fixedly connected to the front and rear ends of the left and right sides of the upper mold base (6). The bottom of the push rod (38) contacts the connecting plate (37).

3. The pressure mechanism for integral die casting of magnesium alloy according to claim 1, characterized in that, The processing mechanism (4) includes multiple supports (41), which are fixedly connected to the outer periphery of the lower mold base (5). A hydraulic cylinder (42) is fixedly connected to the outer side of the support (41). The output end of the hydraulic cylinder (42) passes through the support (41) and is fixedly connected to a back plate (43). The back plate (43) is slidably connected to the support (41). An insert (44) is fixedly connected to one side of the back plate (43).

4. The pressure mechanism for integral die casting of magnesium alloy according to claim 1, characterized in that, The adjustment assembly (29) includes a cylinder (291), which is fixedly connected to one side of the outer wall of the upper suction box (24). The output end of the cylinder (291) passes through the upper suction box (24) and is fixedly connected to a wedge block one (292). The top of the movable plate (25) is fixedly connected to a wedge block two (293), which is in contact with wedge block two (293).

5. The pressure mechanism for integral die casting of magnesium alloy according to claim 4, characterized in that, The vacuuming mechanism (2) also includes a fixing rod (294), which is fixedly connected to the inner side of the upper vacuum box (24). The outer side of the fixing rod (294) is slidably connected to the movable plate (25). A spring (295) is provided on the upper side of the outer wall of the fixing rod (294), and the bottom of the spring (295) abuts against the movable plate (25).

6. The pressure mechanism for integral die casting of magnesium alloy according to claim 1, characterized in that, The lower mold base (5) has four fixed corners at the top, and the upper mold base (6) has four corners at the bottom, with positioning holes inserted into the positioning pins (8).

7. A pressure mechanism for integral die casting of magnesium alloys according to claim 2, characterized in that, The ejection mechanism (3) also includes multiple guide rods (34), which are fixedly connected to the top of the mold frame (1) around the perimeter. The outer side of the guide rods (34) is slidably connected to the needle plate (32).

8. The pressure mechanism for integral die casting of magnesium alloy according to claim 3, characterized in that, The processing mechanism (4) also includes multiple guide posts (45), which are fixedly connected to the top of the corresponding back plate (43). The bottom of the upper mold base (6) is provided with multiple guide holes, which are inserted into the guide posts (45).

9. The pressure mechanism for integral die casting of magnesium alloy according to claim 1, characterized in that, The top of the upper mold base (6) is provided with a pouring gate (7), and the bottom of the pouring gate (7) is connected to the inner side of the upper mold base (6).

10. A pressure mechanism for integral die casting of magnesium alloys according to claim 1, characterized in that, The inner wall surface contour of the wave groove (26) is adapted to the outer wall surface contour of the wave convex groove (22), the bottom end of the hole (27) is connected to the inner side of the wave groove (26), and the inner cavity of the upper air extraction box (24) is connected to the lower space of the movable plate (25) through the hole (27).

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