An externally mounted vacuum connection for a die casting mold

Abstract

The application discloses a vacuum-extraction connector of an externally-installed die-casting die, which comprises a fixed-die side part and a movable-die side part, and the fixed-die side part and the movable-die side part are respectively provided with a fixed die plate and a movable die plate; when the fixed die plate and the movable die plate are closed, a vacuum-extraction channel is formed between the fixed die plate and the movable die plate; the vacuum-extraction channel is sequentially provided with a three-dimensional air passage, a climbing air passage and a spiral air passage from an inlet to an outlet of the vacuum-extraction channel; the three-dimensional air passage is a channel which is alternately bent in a transverse direction, a vertical direction and a longitudinal direction; the climbing air passage is an upwardly-inclined channel; the spiral air passage is a channel which rotates and climbs from bottom to top; and the upper end of the spiral air passage is connected with the outlet of the vacuum-extraction channel. The application can better block the molten liquid alloy injected by a die, and avoid the molten liquid alloy from entering a vacuum-extraction system.

Description

Technical Field

[0001] This invention relates to vacuum technology for die casting molds used in the production of die castings, specifically to an externally mounted vacuum connector for die casting molds. Background Technology

[0002] During the die-casting process, porosity and looseness are common defects. High-vacuum die casting can effectively solve these problems. However, traditional vacuum technology involves setting a vacuum port inside the mold and then using an external vacuum pump connected to the mold's vacuum port to evacuate the mold cavity. The specific implementation process is as follows:

[0003] Before die casting production, the vacuum pump is started, and the mold cavity is evacuated through the vacuum port. Once the vacuum level of the mold cavity meets the requirements, the vacuum port is closed, and the vacuum pump stops evacuating through the vacuum valve. Then, the die casting process is started. Under the high-pressure injection of the die casting machine's injection mechanism, the molten liquid alloy is injected into the mold cavity. Because the molten liquid alloy is filled in a high-vacuum environment, it can smoothly fill the entire mold cavity, preventing gas from remaining in the die casting.

[0004] However, the above vacuuming method has the following problems:

[0005] Firstly, because the die-casting mold has an opening and closing device for the vacuum port with an opening and closing function, the mold structure is relatively complex, which affects the service life of the mold.

[0006] Secondly, if the opening and closing device is not activated in time, the molten liquid alloy may easily enter the vacuum pipe, making the entire production impossible and affecting the production efficiency of die casting.

[0007] Third, even after the vacuum level in the mold cavity reaches the required level, a small amount of new gas will still mix into the mold cavity during the injection molding process of the liquid alloy, resulting in a small amount of porosity defects remaining inside the die casting.

[0008] To address the problems of traditional vacuuming techniques, the inventors previously designed a vacuuming connection structure for a zinc alloy vacuum die-casting mold, published under CN206854613U. However, after a period of actual use, the aforementioned zinc alloy vacuum die-casting mold vacuuming connection structure was found to have the following problems:

[0009] 1. The wavy airflow channel has poor blocking effect on molten liquid alloy, and liquid alloy may be drawn into the vacuum system during the production process.

[0010] 2. Since the vacuum connection structure is directly installed on the fixed mold and the moving mold, the high temperature on the fixed mold and the moving mold will be transferred to the vacuum connection structure during the production process, causing the temperature of the vacuum connection structure to rise rapidly, resulting in poor cooling effect of the cooling system.

[0011] 3. Insufficient sealing may allow external gas to enter the vacuum system.

[0012] Therefore, the present invention redesigns the vacuuming structure to solve the problems encountered in use. Summary of the Invention

[0013] The purpose of this invention is to provide an externally mounted vacuum connector for die-casting molds, which can better block the injection of molten liquid alloy and prevent the molten liquid alloy from entering the vacuum system.

[0014] The objective of this invention is achieved through the following technical solution:

[0015] An externally mounted vacuum connector for die-casting molds is characterized by comprising a fixed mold side portion and a moving mold side portion, wherein the fixed mold side portion and the moving mold side portion are respectively provided with a fixed template and a moving template. When the fixed template and the moving template are closed, a vacuum channel is formed between the fixed template and the moving template. The vacuum channel is provided with a three-dimensional air channel, a climbing air channel and a spiral rising air channel in sequence from its inlet to its outlet. The three-dimensional air channel is a channel that alternately bends and turns in the horizontal, vertical and longitudinal directions. The climbing air channel is a channel that is inclined upward. The spiral rising air channel is a channel that rotates and climbs from bottom to top. The upper end of the spiral rising air channel is connected to the outlet of the vacuum channel.

[0016] Furthermore, the fixed template has a boss on its lower surface, and the lower surface of the boss has multiple longitudinal air grooves. The side of the boss near the middle of the fixed template is a slope, and an upward air groove is provided on the slope. The lower middle of the fixed template has a hole, and the inner wall of the hole has a spiral air groove. The upper part of the moving template has a groove, and the bottom surface of the groove has multiple transverse air grooves. The middle of the moving template has a protruding vacuum core.

[0017] When the fixed template and the moving template are closed, the boss fits into the groove, and the protruding part of the vacuum core fits into the hole. The horizontal air groove and the vertical air groove will connect end to end in sequence to form a three-dimensional air channel. The upward-sloping air groove will form a climbing air channel, and the spiral air groove will form a spiral rising air channel.

[0018] Furthermore, the ends of the transverse air groove and the ends of the longitudinal air groove continue to extend and protrude from the junction.

[0019] Furthermore, the fixed mold plate is provided with a fixed mold cooling pipe, the moving mold plate is provided with a moving mold cooling pipe, and the vacuum core is provided with a central core cooling pipe.

[0020] Furthermore, the fixed mold side is provided with a fixed mold side heat insulation plate, which is installed between the fixed mold plate and the fixed mold of the mold; the moving mold side is provided with a moving mold side heat insulation plate, which is installed between the moving mold plate and the moving mold of the mold.

[0021] Furthermore, a fixed mold side sealing strip is provided between the fixed mold plate and the fixed mold side heat insulation plate, a moving mold side sealing strip is provided between the moving mold plate and the moving mold side heat insulation plate, and a parting surface sealing strip is provided between the fixed mold plate and the moving mold plate.

[0022] Furthermore, a mounting groove is provided in the lower center of the fixed template, in which two sliders are slidably installed. Each slider has a semi-circular slot, which together form a hole. A spring is provided at the bottom of the mounting groove, which provides elastic force to the two sliders out of the groove. When the fixed template and the moving template are closed, the two sliders are pressed into the mounting groove together by the vacuum core. When the fixed template and the moving template are separated, the two sliders will bulge out of the mounting groove under the action of the spring.

[0023] Furthermore, a positioning block is provided on the outer edge of the mounting groove; when the two sliders protrude from the mounting groove under the action of the spring, the positioning block prevents the sliders from continuing to pop outward.

[0024] Furthermore, the diameter of the spiral ascending airway gradually decreases from bottom to top.

[0025] Furthermore, the moving template has a mounting hole in the middle, through which the vacuum core passes. The upper end of the vacuum core protrudes above the moving template, and a pressure plate is fixedly covered at the lower end of the mounting hole. The pressure plate restricts the vacuum core within the mounting hole, and a sealing ring is provided on the inner side of the pressure plate.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1. This invention features a vacuum channel composed of a three-dimensional airway, a climbing airway, and a spiral ascending airway connected sequentially, forming three protective structures. The three-dimensional airway utilizes its alternating bends and turns in the horizontal, vertical, and longitudinal directions, requiring the liquid alloy entering the vacuum channel to undergo multiple directional changes. This initially neutralizes most of the pressure on the liquid alloy, reducing its fluidity. At this point, only a small amount of liquid alloy enters the climbing airway. Since the climbing airway is inclined upwards, it further resists the entering liquid alloy, further reducing its fluidity. Finally, very little, if any, liquid alloy enters the spiral ascending airway. In the upward rotating and climbing channel, the remaining low-fluidity liquid alloy rapidly cools and solidifies. Therefore, the vacuum channel of this invention effectively blocks the injection of molten liquid alloy, preventing it from entering the vacuum system.

[0028] In addition, the alternating bends and turns in the horizontal, vertical and longitudinal directions of the three-dimensional air passage can also extend the path of the liquid alloy flowing through the three-dimensional air passage.

[0029] 2. With the vacuum channel of this invention effectively blocking the injection of molten liquid alloy, a vacuum can still be maintained during production as the molten liquid alloy is injected into the mold cavity, eliminating concerns about the liquid alloy being sucked into the vacuum system. Maintaining a vacuum during the injection process also removes air that may have seeped in, thus better ensuring that the produced die-cast parts are free from porosity and looseness, improving production quality.

[0030] In existing die-casting processes, vacuuming must be stopped during the injection of molten liquid alloy into the mold cavity because the molten liquid alloy can easily be drawn into the vacuum system. This demonstrates that the present invention has played a significant role in improving the die-casting process, thereby further enhancing the quality of die-cast parts.

[0031] 3. The present invention further provides a fixed mold cooling pipe, a moving mold cooling pipe, a core cooling pipe, a fixed mold side heat insulation plate, and a moving mold side heat insulation plate to form a fourth protective structure, which can rapidly cool the liquid alloy entering the vacuum channel.

[0032] 4. The fixed mold side heat insulation plate and the moving mold side heat insulation plate further provided in this invention can achieve heat insulation and prevent the heat in the mold from being transferred to the fixed mold plate and the moving mold plate during the production process, thereby ensuring the cooling effect of the liquid alloy entering the vacuum channel.

[0033] 5. The fixed mold side sealing strip, moving mold side sealing strip, and parting surface sealing strip further provided in this invention can effectively seal the surface, thereby preventing external gas from entering and ensuring the vacuuming effect. Attached Figure Description

[0034] Figure 1 This is a three-dimensional schematic diagram of the fixed mold side portion and the moving mold side portion of the die-casting mold vacuum connector according to an embodiment of the present invention when they are closed;

[0035] Figure 2 This is one of the perspective views of the fixed mold side portion and the moving mold side portion of the die-casting mold vacuum connector according to an embodiment of the present invention when they are separated;

[0036] Figure 3 This is a second perspective view of the fixed mold side portion and the moving mold side portion of the die-casting mold vacuum connector according to an embodiment of the present invention when they are separated;

[0037] Figure 4This is a cross-sectional schematic diagram of the fixed mold side portion and the moving mold side portion of the die-casting mold vacuum connector according to an embodiment of the present invention when they are closed;

[0038] Figure 5 This is an exploded view of the mold side portion according to an embodiment of the present invention;

[0039] Figure 6 This is a three-dimensional schematic diagram of the template according to an embodiment of the present invention;

[0040] Figure 7 This is an exploded view of the moving mold side portion according to an embodiment of the present invention;

[0041] Figure 8 This is one of the three-dimensional schematic diagrams of the moving template according to an embodiment of the present invention;

[0042] Figure 9 This is a second three-dimensional schematic diagram of the moving template according to an embodiment of the present invention;

[0043] Figure 10 This is a perspective view of the fixed mold side portion and the moving mold side portion of the die-casting mold vacuum connector according to an embodiment of the present invention when they are closed;

[0044] Figure 11 This is a schematic diagram of the vacuum channel structure according to an embodiment of the present invention;

[0045] Figure 12 This is a top view of an embodiment of the present invention, showing the transverse air groove and the longitudinal air groove connected end to end in sequence.

[0046] Figure 13 This is a three-dimensional schematic diagram of the vacuum connector for die casting molds installed on the mold according to an embodiment of the present invention.

[0047] Meaning of the labels in the attached diagram:

[0048] 1-Fixed mold plate; 1.1-Boss; 1.2-Longitudinal air groove; 1.3-Bevel; 1.4-Upward bevel air groove; 1.5-Mounting groove; 1.6-Vertical groove; 1.7-Inlay groove; 1.8-Spring limiting hole; 2-Moving mold plate; 2.1-Groove; 2.2-Transverse air groove; 2.3-Mounting hole; 3-Vacuum tube connector; 4-First bolt; 5-Second bolt; 6-Fixed mold side heat insulation plate; 7-Sixth bolt; 8-Fifth bolt; 9-Moving mold side heat insulation plate; 10-Moving mold cooling pipe; 11-Fixed mold cooling pipe; 12-Core cooling pipe; 12.1-Transverse water pipe; 13-Vacuum core; 13.1-Limiting ring; 13.2-Connecting groove; 14-Parting surface sealing strip; 15-Pressure plate; 16-First 7-bolt; 17-slider; 17.1-slide groove; 17.2-positioning groove; 17.3-semi-circular slot; 18-positioning block; 19-guide rail; 20-fourth bolt; 21-hole; 22-spiral air groove; 23-vacuum channel; 23.1-inlet of vacuum channel; 23.2-three-dimensional air passage; 23.3-climbing air passage; 23.4-spiral rising air passage; 23.5-connecting hole; 23.6-outlet of vacuum channel; 24-fixed mold side sealing strip; 25-moving mold side sealing strip; 27-central sealing ring; 28-outer sealing ring; 29-third bolt; 30-spring; 31-fixed mold; 32-moving mold; 33-cavity; 34-injection port; 35-water baffle; 36-protruding part. Detailed Implementation

[0049] The present invention will be further described below with reference to embodiments.

[0050] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0051] In the description of this invention, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0052] In the description of this invention, unless otherwise explicitly defined, terms such as "setting," "installing," and "connecting" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0053] Example:

[0054] like Figures 1 to 12 The image shows a vacuum connector for a die-casting mold in this embodiment, which includes a fixed mold side portion and a moving mold side portion.

[0055] like Figure 5 As shown, the fixed mold side is provided with a fixed mold plate 1, a fixed mold side heat insulation plate 6, a fixed mold side sealing strip 24, two sliders 17, a spring 30, a positioning block 18, a fixed mold cooling pipe 11, and two guide rails 19.

[0056] In use, the fixed template 1 is fixedly installed on the side of the fixed mold 31 of the die-casting mold by the first bolt 4. The fixed mold side heat insulation plate 6 is located between the fixed template 1 and the fixed mold 31. The fixed mold side heat insulation plate 6 is fixed to the side of the fixed mold 31 by the second bolt 5. The fixed mold side heat insulation plate 6 can effectively isolate the high temperature on the fixed mold 31 and prevent heat from being transferred to the fixed template 1. A fixed mold side sealing strip 24 is provided between the fixed template 1 and the fixed mold side heat insulation plate 6. The fixed mold side sealing strip 24 is set along the edge and forms a seal between the fixed template 6 and the fixed mold side heat insulation plate 1 through the fixed mold side sealing strip 24, preventing external gas from entering during vacuuming.

[0057] A boss 1.1 is provided below the fixed template 1. One side of the boss 1.1 is flush with the side of the fixed template 1 near the fixed mold 31. The lower surface of the boss 1.1 is provided with multiple longitudinal air grooves 1.2. In this embodiment, six longitudinal air grooves 1.2 are provided. The side of the boss 1.1 near the middle of the fixed template 1 is a slope 1.3. Three upward-sloping air grooves 1.4 are provided on the slope 1.3, which gradually converge from bottom to top.

[0058] A mounting groove 1.5 is provided in the lower center of the fixed template 1. Vertical grooves 1.6 are provided on the left and right sides of the mounting groove 1.5. Two guide rails 19 are respectively fixed in the vertical grooves 1.6 by third bolts 29. Sliding grooves 17.1 are provided on the sides of the two sliders 17. The two sliders 17 are respectively embedded in the left and right sides of the mounting groove 1.5. The sliding grooves 17.1 of the two sliders 17 are respectively engaged with the guide rails 19 for sliding connection, thereby slidingly installing the two sliders 17. The sliding engagement structure between the sliding grooves 17.1 and the guide rails 19 is a conventional structure, which is engaged by a T-shaped groove structure and a T-shaped guide rail structure. Spring limiting holes 1.8 are provided at the bottom of the mounting groove 1.5. Springs 30 are inserted into the spring limiting holes 1.8, and the springs 30 are compressed between the sliders 17 and the bottom surface of the sliding groove 1.5. Positioning grooves 17.2 are provided on the side of the slider 17. The front end of the positioning groove 17.2 passes through the slider. The positioning block 18 is fixedly installed in the inlay groove 1.7 on the outer edge of the mounting groove 1.5 by the fourth bolt 20. The protruding part of the positioning block 18 is located in the positioning groove 17.2. When the slider 17 is in the initial state and protrudes out of the mounting groove 1.5 under the action of the spring 30, the protruding part of the positioning block 18 blocks the bottom surface of the positioning groove 17.2, preventing the slider 17 from continuing to pop out and avoiding the slider 17 from leaving the mounting groove 1.5.

[0059] Two sliders 17 each have a semi-circular slot 17.3, which together form a hole 21. A spiral groove 22 is provided on the inner wall of the hole 21, rotating and ascending from bottom to top. The cross-section of the spiral groove 22 is semi-circular. A connecting hole 23.5 is provided at the bottom of the hole 21. The upper end of the spiral groove 22 is connected to the connecting hole 23.5 through a connecting groove 13.2 at the upper end of the vacuum core 13, and then connected to the outlet 23.6 of the vacuum channel 23 through the connecting hole 23.6. A vacuum tube connector 3 is provided at the outlet 23.6 of the vacuum channel 23. The diameter of the hole 21 gradually decreases from the outer end to the inner end, causing the diameter of the spiral ascending air passage 23.4 to gradually decrease from bottom to top. During use, the ejection of the two sliders 17 can clean the solidified metal in the spiral ascending air passage 23.4, preparing for the next production cycle.

[0060] This embodiment includes two mold cooling pipes 11, which pass through the mold platen 1. Both ends of the mold cooling pipes 11 are water pipe connectors for connecting to external cooling water pipes. During use, cooling water circulates through the mold cooling pipes 11, thereby rapidly reducing the temperature of the mold platen 1.

[0061] like Figure 7As shown, the moving mold side is provided with a moving mold plate 2, a vacuum core 13, a pressure plate 15, a parting surface sealing strip 14, a moving mold side heat insulation plate 9, a moving mold side sealing strip 25, a sealing ring, a moving mold cooling pipe 10, and a central core cooling pipe 12.

[0062] In use, the moving template 2 is fixedly installed on the side of the moving mold 32 of the die-casting mold by the fifth bolt 8. The moving mold side heat insulation plate 9 is located between the moving template 2 and the moving mold 32. The moving mold side heat insulation plate 9 is fixed to the side of the moving mold 32 by the sixth bolt 7. The moving mold side heat insulation plate 9 can effectively isolate the high temperature on the moving mold 32 and prevent heat from being transferred to the moving template 2. A moving mold side sealing strip 25 is provided between the moving template 2 and the moving mold side heat insulation plate 9. The moving mold side sealing strip 25 is set along the edge and forms a seal between the moving template 2 and the moving mold side heat insulation plate 9 to prevent external gas from entering during vacuuming.

[0063] A groove 2.1 is provided on the upper part of the moving mold plate 2. One side of the groove 2.1 is flush with the side of the fixed mold plate 2 near the fixed mold 32, and the side of the groove 2.1 near the middle of the fixed mold plate 2 is also inclined. Eight transverse air grooves 2.2 are provided on the bottom surface of the groove 2.1, of which the three transverse air grooves near the moving mold 32 are used to communicate with the cavity 33 in the moving mold 32. The transverse air grooves 2.2 and the longitudinal air grooves 1.2 are matched and can be connected end to end after the upper and lower parts are closed. In this embodiment, the transverse air grooves 2.2 and the longitudinal air grooves 1.2 are perpendicular and intersect at 90°.

[0064] A mounting hole 2.3 is provided in the middle of the moving template 2. The vacuum core 13 passes through the mounting hole 2.3 from bottom to top. A limiting ring 13.1 is provided on the lower end side wall of the vacuum core 13, which restricts the lower end of the vacuum core 13 within the mounting hole 2.3. The upper end of the vacuum core 13 protrudes to the top of the moving template 2. The pressure plate 15 is fixed to the lower end of the mounting hole 2.3 by the seventh bolt 16, thereby stably fixing the vacuum core 13 in the mounting hole 2.3. A sealing ring is provided on the inner side of the pressure plate 15. The sealing ring includes an outer sealing ring 28 and a middle sealing ring 17, such as... Figure 10 As shown, the diameter of the outer sealing ring 28 is larger than the diameter of the middle sealing ring 27. The outer sealing ring 28 is positioned near the edge to prevent external gas from entering. The middle sealing ring 27 is located around the periphery of the core cooling pipe 12 and is used for sealing and waterproofing.

[0065] This embodiment features three moving mold cooling pipes 10, which pass through the moving mold platen 2. Both ends of the moving mold cooling pipes 10 are water pipe connectors for connecting to external cooling water pipes. During use, cooling water circulates through the moving mold cooling pipes 10, thereby rapidly reducing the temperature of the fixed mold platen 2.

[0066] The core cooling pipe 12 is located in the middle of the vacuum core. A horizontal water pipe 12.1 is located at the lower end of the core cooling pipe 12. Both ends of the horizontal water pipe 12.1 extend from the side of the moving template 2 and are equipped with water pipe joints for connection to external cooling water pipes. A water baffle 35 is located in the middle of the core cooling pipe 12, dividing the internal space of the core cooling pipe 12 into left and right parts. A notch is located at the upper end of the water baffle 35, connecting the left and right parts.

[0067] When the fixed template 1 and the moving template 2 are closed, the boss 1.1 will fit into the groove 2.1, and the surface of the boss 1.1 will be in contact with the surface of the groove 2.1. The protruding part of the vacuum core 13 will fit into the hole 21, and the surface of the vacuum core 13 will be in contact with the inner surface of the hole 21. The transverse air groove 2.2 and the longitudinal air groove 1.2 will be connected end to end to form a three-dimensional air channel 23.2. In this embodiment, three three-dimensional air channels 23.2 are formed. The three-dimensional air channel 23.2 is a channel that alternately bends and turns in the transverse, vertical and longitudinal directions, such as Figure 11 and Figure 12 As shown, when the molten liquid alloy enters the three-dimensional gas channel 23.2, it first passes through the transverse gas groove 2.2, then turns vertically upwards into the longitudinal gas groove 1.2. After turning vertically, it turns vertically downwards again into the next transverse gas groove 2.2. This alternating turning in the transverse, vertical, and longitudinal directions maximizes the initial elimination of most of the pressure on the liquid alloy. The upward-sloping gas groove 1.4 forms three ascending gas channels 23.3. Since the ascending gas channels 23.3 are inclined upwards, they further resist the entering liquid alloy, further reducing its fluidity. The spiral gas groove 22 forms a spiral ascending gas channel 23.4. Due to the obstruction of the preceding three-dimensional gas channels 23.2 and ascending gas channels 23.3, very little or no liquid alloy will enter the spiral ascending gas channel 23.4 at the end. In the bottom-to-top rotating ascending channel, the remaining low-fluidity liquid alloy will rapidly cool and solidify, thus ensuring that the liquid alloy does not enter the vacuum system. The three-dimensional airway 23.2, the climbing airway 23.3, and the spiral rising airway 23.4 are connected in sequence from the inlet 23.1 to the outlet 23.6, forming a vacuum channel 23 located between the fixed template 1 and the moving template 2.

[0068] like Figure 12 As shown, in this embodiment, the ends of the transverse air groove 2.2 and the longitudinal air groove 1.2 continue to extend and protrude from the junction. A certain volume of liquid alloy can be collected in the protruding part 36, so that the liquid alloy entering can stay more in the three-dimensional air channel 23.2, thereby better blocking the liquid alloy.

[0069] As can be seen from the above structure, this embodiment forms a four-layer protective structure for the vacuum connector of the die-casting mold: the first layer is a three-dimensional air channel 23.2; the second layer is a climbing air channel 23.3; the third layer is a spiral rising air channel 23.4; and the fourth layer is a cooling structure consisting of a heat insulation plate and cooling pipes. These four protective structures effectively block the injected molten liquid alloy, preventing it from entering the vacuum system. Furthermore, during production, the vacuum can still be maintained while the molten liquid alloy is injected into the mold cavity, eliminating concerns about the liquid alloy being sucked into the vacuum system.

[0070] The process of using the vacuum connector for the die-casting mold in this embodiment is as follows:

[0071] like Figure 13 As shown, during use, the fixed mold side and the moving mold side are fixedly installed on the fixed mold 31 and the moving mold 32 of the mold with bolts, respectively. The three transverse air grooves 2.2 near the moving mold 32 are connected to the cavity 33 in the moving mold. The ports of the three transverse air grooves 2.2 near the moving mold 32 are the inlets of the vacuum channel 23. The mold is installed on the die casting machine. The vacuum pipe connector 3 at the outlet of the vacuum channel 23 is connected to the vacuum pump of the vacuum system of the die casting machine. The fixed mold cooling pipe 11, the moving mold cooling pipe 10 and the core cooling pipe 12 are connected to the cooling system of the die casting machine, so that the cooling water can circulate through the fixed mold cooling pipe 11, the moving mold cooling pipe 10 and the core cooling pipe 12 during the production process.

[0072] During the production process, the mold is first closed using a die-casting machine. After mold closure, the fixed mold plate 1 and the moving mold plate 2 are sealed together, with the boss 1.1 correspondingly embedded in the groove 2.1. The protruding part of the vacuum core 13 is fitted into the hole 21, and the two sliders 17 are pressed into the mounting groove 1.5, compressing the spring 3. Then, the cavity 33 of the mold is evacuated. When the vacuum level reaches the set value, the molten liquid alloy is injected from the injection port 34 of the mold. The liquid alloy will fill the cavity 33 and flow into the vacuum channel 23. In the vacuum channel 23, the liquid alloy first passes through the three-dimensional air channel 23.2. The three-dimensional air channel 23.2 utilizes its alternating twists and turns in the horizontal, vertical and longitudinal directions, which causes the liquid alloy entering the vacuum channel 23 to undergo multiple directional changes. This can first offset most of the pressure of the liquid alloy and reduce its fluidity. At this time, only a small amount of liquid alloy can enter the climbing air channel 23.3. Since the climbing air channel 23.3 is inclined upward, it further resists the entering liquid alloy and further reduces its fluidity. Finally, very little or no liquid alloy will enter the spiral rising air channel 23.4. In the channel that rotates and rises from bottom to top, the remaining low-fluidity liquid alloy will cool and solidify rapidly.

[0073] In the process of injecting the molten liquid alloy into the mold cavity 33, a vacuum can still be maintained to remove the air that has seeped in during the injection process, thereby better ensuring that the produced die castings will not have porosity or looseness, thus improving the production quality.

[0074] After the injection is completed and the set pressure and set time are maintained, the part is cooled and shaped, then the mold is opened, and finally the die-casting part formed in cavity 33 is ejected to obtain the die-casting part, thus completing one production cycle.

[0075] During the mold opening process, the fixed mold plate 1 and the moving mold plate 2 will also separate vertically. The two sliders 17 will pop out under the action of the spring 30, which will cause the solidified metal in the spiral rising air passage 23.4 to fall down, achieve cleaning, and prepare for the start of the next production cycle.

[0076] The above embodiments of the present invention are not intended to limit the scope of protection of the present invention. The implementation of the present invention is not limited thereto. All other modifications, substitutions or alterations made to the above structure of the present invention based on the above content of the present invention, in accordance with ordinary technical knowledge and common practice in the field, without departing from the basic technical idea of ​​the present invention, shall fall within the scope of protection of the present invention.

Claims

1. An externally mounted vacuum connector for die-casting molds, characterized in that: It includes a fixed mold side portion and a moving mold side portion. The fixed mold side portion and the moving mold side portion are respectively provided with a fixed template and a moving template. When the fixed template and the moving template are closed, a vacuum channel is formed between the fixed template and the moving template. The vacuum channel is provided with a three-dimensional air channel, a climbing air channel and a spiral rising air channel in sequence from its inlet to its outlet. The three-dimensional air channel is a channel that alternately turns and bends in the horizontal, vertical and longitudinal directions. The climbing air channel is a channel that is inclined upward. The spiral rising air channel is a channel that rotates and climbs from bottom to top. The upper end of the spiral rising air channel is connected to the outlet of the vacuum channel. The fixed template has a boss on its lower surface, and the lower surface of the boss has multiple longitudinal air grooves. The side of the boss near the middle of the fixed template is inclined, and an upwardly inclined air groove is provided on the inclined surface. The lower middle of the fixed template has a hole, and the inner wall of the hole has a spiral air groove. The moving template has a groove on its upper surface, and the bottom surface of the groove has multiple transverse air grooves. The middle of the moving template has a protruding vacuum core. When the fixed template and the moving template are closed, the boss is engaged and embedded in the groove, the protruding part of the vacuum core is engaged and embedded in the hole, the transverse air groove and the longitudinal air groove are connected end to end in sequence to form the three-dimensional air channel, the oblique upward air groove will form the climbing air channel, and the spiral air groove will form the spiral rising air channel.

2. The externally mounted die-casting mold vacuum connector according to claim 1, characterized in that: The ends of the transverse air groove and the ends of the longitudinal air groove continue to protrude from the point of contact.

3. The externally mounted die-casting mold vacuum connector according to claim 1, characterized in that: The fixed template is provided with a fixed mold cooling pipe, the moving template is provided with a moving mold cooling pipe, and the vacuum core is provided with a central core cooling pipe.

4. The externally mounted die-casting mold vacuum connector according to claim 1, characterized in that: The fixed mold side portion is provided with a fixed mold side heat insulation plate, which is installed between the fixed mold plate and the fixed mold of the mold; the moving mold side portion is provided with a moving mold side heat insulation plate, which is installed between the moving mold plate and the moving mold of the mold.

5. The externally mounted die-casting mold vacuum connector according to claim 4, characterized in that: A fixed mold side sealing strip is provided between the fixed mold template and the fixed mold side heat insulation plate, a moving mold side sealing strip is provided between the moving mold template and the moving mold side heat insulation plate, and a parting surface sealing strip is provided between the fixed mold template and the moving mold template.

6. The externally mounted die-casting mold vacuum connector according to claim 1, characterized in that: The fixed template has a mounting groove in its lower center, in which two sliders are slidably mounted. Each slider has a semi-circular slot, which together form the hole. A spring is located at the bottom of the mounting groove, providing elastic force to the two sliders outward. When the fixed template and the moving template are closed, the two sliders are pressed into the mounting groove by the vacuum core. When the fixed template and the moving template are separated, the two sliders protrude from the mounting groove under the action of the spring.

7. The externally mounted die-casting mold vacuum connector according to claim 6, characterized in that: The outer edge of the mounting groove is provided with a positioning block; when the two sliders protrude from the mounting groove under the action of the spring, the positioning block prevents the sliders from continuing to pop outward.

8. The externally mounted die-casting mold vacuum connector according to claim 1, characterized in that: The diameter of the spiral ascending airway gradually decreases from bottom to top.

9. The externally mounted die-casting mold vacuum connector according to claim 1, characterized in that: The moving template has a mounting hole in the middle, the vacuum core passes through the mounting hole, the upper end of the vacuum core protrudes to the top of the moving template, and a pressure plate is fixedly covered at the lower end of the mounting hole. The pressure plate restricts the vacuum core in the mounting hole, and a sealing ring is provided on the inner side of the pressure plate.

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