A vacuum die-casting mould

Abstract

The present application belongs to the technical field of vacuum die casting, and particularly relates to a vacuum die casting mold. The mold comprises a partition, a first mold piece, a second mold piece and a pressure applying piece. The first mold piece and the second mold piece are combined to form a casting cavity. The partition is slidingly assembled in the first mold piece along the combined direction, and the free end is inserted into the sealing groove of the second mold piece to divide the casting cavity into two casting cavity sections. The first side wall of the sealing groove is a smooth surface, and the second side wall is provided with a pressure applying groove. The pressure applying piece is sealingly and slidingly assembled in the pressure applying groove and is driven by air pressure to move between the extended position and the retracted position. When extended, the pressure applying piece abuts against the partition to form a seal against the first side wall. The present application has stable and reliable sealing and pressure applying, low failure rate, adjustable sealing force, smooth sealing surface for easy demolding and no interference, and the pressure applying piece is driven by pressure difference without the need for additional mechanical power source. The negative pressure source is reused by configuring the existing vacuum equipment through the pressure regulating device, and is suitable for the sealing requirements of segmented vacuum die casting.

Description

Technical Field

[0001] This invention belongs to the field of vacuum die casting technology, and specifically relates to a vacuum die casting mold. Background Technology

[0002] Vacuum die casting improves the mechanical properties and surface quality of castings by removing gas from the mold cavity during the die casting process, thereby eliminating or reducing porosity and dissolved gases inside the casting. However, vacuum die casting requires high sealing performance of the mold, and the effectiveness of maintaining the vacuum level within the cavity directly affects the quality of the casting.

[0003] For castings with complex structures or large contours, evacuating a single cavity entirely places high demands on the processing capacity of vacuum equipment and presents significant challenges in maintaining a tight seal. To address this, the industry has proposed a segmented vacuum die casting scheme that divides the cavity into multiple casting cavity sections, evacuating and filling each section sequentially. This allows each casting cavity section to achieve a higher vacuum level within a smaller volume, reducing the demands on the processing capacity of the vacuum equipment. In segmented vacuum die casting, separators are used to separate adjacent casting cavity sections, and their sealing performance directly determines the vacuum retention effect of each casting cavity section.

[0004] During vacuuming and die casting, the separator must withstand the pressure difference between the inside and outside of the mold cavity and maintain a stable seal under repeated high temperature and high pressure conditions. Simultaneously, the sealing surface area where the separator contacts the casting must allow for smooth demolding without interference after the casting solidifies. Therefore, the sealing pressure application mechanism of the separator must consider sealing stability, the coordination between the sealing surface and demolding, and the adaptability of the sealing force to different operating conditions. Summary of the Invention

[0005] The purpose of this invention is to provide a vacuum die casting mold that addresses the requirements of the sealing and pressure application mechanism of the separator in a vacuum die casting mold, which needs to consider sealing stability, the coordination between the sealing surface and demolding, and the adaptability of the sealing force.

[0006] To achieve the above objectives, one technical solution adopted by the present invention is: A vacuum die-casting mold, comprising: Separator; The first module, wherein the separator is slidably assembled inside the first module along the mold closing direction of the first module; The second module is molded with the first module to form a casting cavity. The molded side of the second module has a sealing groove for the free end of the separator to be inserted. The sealing groove has a first sidewall and a second sidewall with opposite sides. The first sidewall faces the molten liquid inlet and is a smooth surface. The second sidewall has a pressure groove. The pressure-applying component is sealed and slidably assembled within the pressure-applying groove; When the mold is closed, the separator is inserted into the sealing groove to seal and divide the casting cavity into two casting cavity sections; the air pressure in the pressure groove is adjustable, and the pressure member moves between the extended position and the retracted position through the pressure difference between the pressure groove and the casting cavity section; thereby driving the pressure member to move between the extended position and the retracted position; in the extended position, the pressure member extends into the sealing groove and abuts against the separator to apply pressure so that the separator abuts against the first side wall.

[0007] Furthermore, the pressure groove is provided with a limiting step surface; In the retracted position, one end of the pressure-applying member facing the bottom of the pressure groove abuts against the limiting step surface, and the other end of the pressure-applying member facing the sealing groove is flush with the opening of the pressure groove.

[0008] Furthermore, the pressure tank can be selectively connected to the atmosphere or a negative pressure source; When the pressure groove is connected to the atmosphere, the pressure difference between the pressure inside the pressure groove and the pressure inside the casting cavity section drives the pressure-applying component to move to the extended position; When the pressure tank is connected to the negative pressure source, the pressure difference between the pressure in the pressure tank and the pressure in the casting cavity section drives the pressure-applying component to move to the retraction position.

[0009] Furthermore, it also includes: Vacuum equipment is used to evacuate the casting cavity section; A vacuum gauge is used to measure the vacuum level of the casting cavity section and the pressure tank.

[0010] Furthermore, the negative pressure source is provided by the vacuum device, and the pressure tank is connected to the vacuum device through an air passage.

[0011] Furthermore, it also includes a voltage regulating device; The pressure regulating device is located between the vacuum equipment and the pressure tank, and is used to adjust the negative pressure input to the pressure tank.

[0012] Furthermore, during the sealing stage of the separator, the vacuum level of the casting cavity section near the molten liquid inlet is higher than that of the other casting cavity section, and the pressure difference between the adjacent casting cavity sections causes the separator to press against the first sidewall. During the release phase of the separator, the vacuum level of the casting cavity section near the molten inlet is reduced to the same level as that of the other casting cavity section, and the pressure difference between the adjacent casting cavity sections disappears.

[0013] Furthermore, it also includes a control system; The control system is connected to the vacuum equipment and the vacuum gauge, and is used to control the vacuum equipment to perform vacuuming operations on each of the casting cavity sections according to the measurement value of the vacuum gauge, and to control the pressure tank to switch between being connected to the atmosphere and being connected to the negative pressure source.

[0014] Furthermore, it also includes a pull-out mechanism, which is disposed on the first module and connected to the separator, for completely pulling the separator out of the sealing groove.

[0015] Furthermore, the first module is a fixed mold, and the second module is a moving mold.

[0016] Compared with the prior art, the present invention has the following advantages: The pressure-applying component is sealed and slidably assembled in the pressure-applying groove and is driven to extend and retract by air pressure. It has good stability and low failure rate under repeated high temperature and high pressure conditions. By adjusting the vacuum degree of the casting cavity section, the pressure difference between the pressure in the pressure-applying groove and the pressure in the casting cavity section can be changed, thereby adjusting the pressure applied by the pressure-applying component to the separator at the extended position, so that the sealing force can be flexibly adjusted according to different casting conditions.

[0017] The first sidewall is designed as a smooth surface. After the molten liquid solidifies, the surface of the gate formed is smooth and does not form embedment or seizing. This eliminates the interference between the sealing surface and the casting demolding, resulting in smooth demolding and an intact casting surface.

[0018] The expansion and contraction of the pressure-applying component is driven by the pressure difference between the pressure in the pressure-applying groove and the pressure in the casting cavity section, eliminating the need for an additional mechanical power source and simplifying the mold structure; the negative pressure source for retraction is configured by taking pressure from existing vacuum equipment through a pressure regulating device, reusing the existing air source, eliminating the need for an additional independent power source, and reducing system complexity and cost.

[0019] During the sealing stage, the pressure difference between adjacent casting cavity sections is superimposed in the same direction as the active pressure applied by the pressure-applying component, forming a double sealing guarantee; during the release stage, the pressure difference can be eliminated by reducing the vacuum on one side or increasing the vacuum on the other side, making both sealing and release flexible and reliable.

[0020] The limiting step is rigidly positioned at the retracted position of the pressure-applying component, and its front end is flush with the opening, which facilitates the smooth flow of molten liquid and demolding. Since the free end of the separator has weaker overhang support than the connecting end, the pressure-applying component compensates for the pressure to ensure reliable sealing of the free end. Attached Figure Description

[0021] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a cross-sectional structural diagram of an embodiment of a vacuum die-casting mold according to the present invention; Figure 2 for Figure 1 A magnified schematic diagram of the structure at point A in the middle.

[0022] The meanings of the labels in the attached diagram are as follows: Casting cavity a, first casting cavity section a1, second casting cavity section a2, first air passage b1, second air passage b2, third air passage b3, molten liquid inlet c, separator 1, first mold 2, second mold 3, sealing groove 3a, first side wall 3a1, second side wall 3a2, pressure groove 3b, limiting step surface 3b1, pressure component 4, and pull-out mechanism 5. Detailed Implementation

[0023] The invention will now be further described with reference to the accompanying drawings.

[0024] Please refer to Figure 1 As shown, in one embodiment of a vacuum die-casting mold, the illustrated structure represents one of various embodiments of the present invention. This embodiment's vacuum die-casting mold includes a separator 1, a first mold 2, a second mold 3, and a pressure-applying component 4. The first mold 2 is a fixed mold located on the right side; the second mold 3 is a moving mold located on the left side. The second mold 3 is horizontally aligned with or separates from the first mold 2. The first mold 2 and the second mold 3 together form a casting cavity a, which is divided by the separator 1 into an upper second casting cavity segment a2 and a lower first casting cavity segment a1. A molten liquid inlet c is provided on the lower side of the first mold 2, and the molten liquid inlet c communicates with the first casting cavity segment a1.

[0025] The separator 1 is slidably assembled within the first mold 2 along the mold-closing direction (horizontal direction). The right end of the separator 1 is connected to a pull-out mechanism 5, which is located at the right end of the first mold 2 and is used to completely extract the separator 1 from the sealing groove 3a. The left end of the separator 1 is a free end, which slides out to the left during mold closing and inserts into the sealing groove 3a on the mold-closing side (right side) of the second mold 3. The sealing groove 3a has opposing first sidewalls 3a1 and 3a2. The first sidewall 3a1 is located below, facing the molten liquid inlet c, and is a smooth surface. The second sidewall 3a2 is located above. The second sidewall 3a2 has a pressure groove 3b that extends upwards into the body of the second mold 3. The pressure member 4 is slidably assembled within the pressure groove 3b and can move vertically between an extended position and a retracted position.

[0026] With the above configuration, when the mold is closed, the separator 1 slides to the left, and its free end inserts into the sealing groove 3a, sealing and dividing the casting cavity a into the upper second casting cavity section a2 and the lower first casting cavity section a1. The air pressure in the pressure groove 3b is adjustable. When the pressure applying member 4 is driven to move downward to the extended position, the pressure applying member 4 extends into the sealing groove 3a and abuts against the upper surface of the separator 1, applying pressure to make the separator 1 abut against the first side wall 3a1, forming a seal. The first side wall 3a1 is a smooth surface. Even if the molten liquid enters the sealing groove 3a and forms a gate after solidification, the gate surface is smooth and does not form embedment or seizing, which is conducive to demolding. The right end of the separator 1 is connected to the side of the pull-out mechanism 5. Because it is closer to the pull-out mechanism 5 and has better support rigidity, the sealing effect is relatively reliable. However, the left end of the separator 1 is a free end and is cantilevered, with weaker support than the right end. Therefore, the pressure applying member 4 needs to apply additional pressure from above to compensate for the sealing force of the free end. It should be understood that, in some embodiments, similar pressure grooves and pressure members can also be symmetrically arranged on the first module 2 corresponding to the side of the partition 1 connected to the pull-out mechanism 5 to apply pressure from top to bottom, so that the upper surfaces of both ends of the partition 1 are pressured; however, in this embodiment, because the right end of the partition 1 is closer to the pull-out mechanism 5 and has better support rigidity, pressure members 4 are only provided on the second module 3 corresponding to the left end (free end).

[0027] Please refer to Figure 2 As shown, a limiting step surface 3b1 is further provided in the pressure groove 3b. In this embodiment, the limiting step surface 3b1 is formed by the end face of the limiting ring assembled in the pressure groove 3b. In the retracted position, the rear end (upper end) of the pressure member 4 abuts against the limiting step surface 3b1, and the front end (lower end) of the pressure member 4 is flush with the opening of the pressure groove 3b. Through the above configuration, the limiting step surface 3b1 rigidly positions the retracted position of the pressure member 4, so that the front end of the pressure member 4 is just flush with the opening of the pressure groove 3b when it is in the retracted position and does not protrude into the sealing groove 3a. Thus, after the separator 1 is pulled out, the molten liquid can flow smoothly through the sealing groove 3a area without being blocked by the pressure member 4; at the same time, the limiting step surface 3b1 makes the pressure member 4 stably positioned in the retracted position and will not be pushed back to the extended position due to the pressure of the molten liquid. It should be understood that the limiting step surface 3b1 is not limited to being formed by the end face of the limiting ring, but may also be formed by an integrally machined step surface on the inner wall of the pressure groove 3b in other embodiments.

[0028] Furthermore, the pressure-applying component 4 is a cylindrical member, and its outer wall is provided with a sealing structure (not shown in the figure). The sealing structure is in a sealing fit with the inner wall of the pressure-applying groove 3b. In this embodiment, the sealing structure is a sealing ring provided on the outer wall of the pressure-applying component 4. Through the above configuration, the pressure-applying component 4 and the inner wall of the pressure-applying groove 3b are in a sealing fit, so that the air pressure in the pressure-applying groove 3b can stably drive the pressure-applying component 4 to move without insufficient driving force due to air leakage. It should be understood that the sealing structure is not limited to a sealing ring. In other embodiments, it can also be a sealing sleeve, a coating, or other sealing forms, as long as it can form a high-temperature resistant seal between the pressure-applying component 4 and the inner wall of the pressure-applying groove 3b.

[0029] Furthermore, the pressure groove 3b can be selectively connected to the atmosphere or a negative pressure source. When the pressure groove 3b is connected to the atmosphere, the pressure difference between the pressure inside the pressure groove 3b and the pressure inside the casting cavity drives the pressure element 4 to move to the extended position; when the pressure groove 3b is connected to the negative pressure source, the pressure difference between the pressure inside the pressure groove 3b and the pressure inside the casting cavity drives the pressure element 4 to move to the retracted position. With the above configuration, the extension and retraction of the pressure element 4 is driven by the pressure difference between the pressure inside the pressure groove 3b and the pressure inside the casting cavity, without the need for an additional mechanical power source. The mold structure improves sealing performance without significantly changing the mold shape and volume. During the sealing stage, the pressure groove 3b is connected to the atmosphere, and the pressure difference between the atmospheric pressure and the negative pressure in the casting cavity pushes the pressure element 4 to the extended position; during the release stage, the pressure groove 3b is connected to the negative pressure source, and the negative pressure inside the pressure groove 3b is greater than the negative pressure in the casting cavity, and the pressure difference pulls the pressure element 4 back to the retracted position. By adjusting the vacuum level in the casting cavity section, the pressure difference between the pressure in the pressure application groove 3b and the pressure in the casting cavity section can be changed, thereby adjusting the pressure applied by the pressure application component 4 to the separator 1 at the extended position. This allows the sealing force to be flexibly adjusted according to different casting conditions. For example, for conditions with high sealing requirements, the vacuum level in the casting cavity section can be increased to increase the pressure difference and the applied pressure; for conditions with lower sealing requirements, the vacuum level in the casting cavity section can be decreased to reduce the applied pressure, avoiding excessive compression that could affect the extraction of the separator.

[0030] Please refer to Figure 1 As shown, the second module 3 further includes a first air passage b1, a second air passage b2, and a third air passage b3. The outer ends of these three passages are located on the left side of the second module 3, and their inner ends are respectively connected to the first casting cavity section a1, the second casting cavity section a2, and the pressure groove 3b. In this embodiment, the first air passage b1, the second air passage b2, and the third air passage b3 are directly machined onto the second module 3, and their outer ends can be connected to a valve-type control structure. With the above configuration, the first air passage b1 is used to evacuate the first casting cavity section a1, the second air passage b2 is used to evacuate the second casting cavity section a2, and the third air passage b3 is used for switching the connection between the pressure groove 3b and the atmosphere or a negative pressure source.

[0031] Furthermore, the vacuum die-casting mold in this embodiment also includes a vacuum device and a vacuum gauge (not shown in the figure). The vacuum device is used to evacuate the casting cavity section, and the vacuum gauge is used to measure the vacuum degree of the casting cavity section and the pressure tank 3b. With the above configuration, the vacuum device evacuates the first casting cavity section a1 and the second casting cavity section a2 through the first air channel b1 and the second air channel b2 respectively, and the vacuum gauge simultaneously monitors the vacuum degree of each casting cavity section and the pressure tank 3b, providing real-time data for differential pressure drive. In this embodiment, multiple vacuum gauges are provided, respectively arranged corresponding to the first casting cavity section a1, the second casting cavity section a2 and the pressure tank 3b, to realize multi-point vacuum degree monitoring.

[0032] Furthermore, the negative pressure source comes from the vacuum equipment used to evacuate the casting cavity section. With the above configuration, the negative pressure source required for the retraction drive of the pressure tank 3b can reuse the existing vacuum equipment, eliminating the need to add a separate negative pressure source, thus reducing system complexity and cost.

[0033] Furthermore, the vacuum die-casting mold in this embodiment also includes a pressure regulating device (not shown in the figure). The pressure regulating device is located in the gas line between the vacuum equipment and the pressure tank 3b, and is used to adjust the negative pressure input to the pressure tank 3b. In this embodiment, the pressure regulating device is a pressure regulating valve. Through the above configuration, the pressure regulating valve takes pressure from the vacuum equipment and configures it to the working negative pressure value required for the pressure tank 3b to retract. This negative pressure value must be greater than the negative pressure in the casting cavity section to drive the pressure applying element 4 to retract, but it is not necessarily equal to the limit negative pressure of the vacuum equipment. The pressure regulating valve takes pressure from the vacuum equipment, adjusts the negative pressure value output to the pressure tank, and configures the negative pressure required for different working conditions from the same gas source, so that the retraction driving force of the pressure applying element 4 is adjustable. Since the negative pressure source reuses the existing vacuum equipment configured by the pressure regulating valve, there is no need to add an independent power source, reducing system complexity and cost. It should be understood that the pressure regulating device is not limited to a pressure regulating valve, and may also be other pressure regulating devices in other embodiments.

[0034] Furthermore, during the sealing stage of the separator 1, the vacuum level of the first casting cavity section a1 near the molten liquid inlet c is higher than that of the second casting cavity section a2. The pressure difference between adjacent casting cavity sections causes the separator 1 to press against the first sidewall 3a1. During the release stage of the separator 1, the vacuum level of the first casting cavity section a1 near the molten liquid inlet c decreases to be equal to that of the second casting cavity section a2, and the pressure difference between adjacent casting cavity sections disappears. With the above configuration, during the sealing stage, the vacuum level of the first casting cavity section a1 is high (large negative pressure), and the vacuum level of the second casting cavity section a2 is low (small negative pressure). The pressure difference pushes the separator 1 towards the first sidewall 3a1, which is superimposed in the same direction as the active pressure of the pressure applying component 4, forming a double sealing guarantee. During the release stage, the vacuum level of the first casting cavity section a1 can be reduced by closing the vacuum valve of the first air passage b1, or the vacuum level of the second casting cavity section a2 can be increased, so that the pressure difference between adjacent casting cavity sections disappears, and the separator 1 is no longer pressed against the first sidewall 3a1, and can smoothly detach from the sealing groove 3a. It should be understood that the vacuum configuration of the sealing and release stages can be flexibly adjusted according to the casting structure and filling progress, and is not limited to the specific configuration described in this embodiment.

[0035] Furthermore, the vacuum die-casting mold in this embodiment also includes a control system (not shown in the figure). The control system is connected to the vacuum equipment, vacuum gauge, and valve control structures at the outer ends of each gas channel. It is used to control the vacuum equipment to perform vacuuming operations on each casting cavity section according to the measurement value of the vacuum gauge, and to control the pressure tank 3b to switch between being connected to the atmosphere and being connected to the negative pressure source. Through the above configuration, the control system automatically coordinates the vacuuming operation of the vacuum equipment and the connection switching of the pressure tank 3b according to the real-time measurement value of the vacuum gauge. During the sealing stage, it controls the third gas channel b3 to be connected to the atmosphere and maintains different vacuum levels in each casting cavity section; during the release stage, it controls the third gas channel b3 to switch to being connected to the negative pressure source and closes the vacuum valve of the first casting cavity section a1, realizing automatic coordination of the entire process.

[0036] Furthermore, the separator 1 has a pull-out mechanism 5, which is located at the right end of the first module 2 and is used to completely pull the separator 1 out of the sealing groove 3a in the horizontal direction. With the above configuration, after the pressure member 4 is retracted during the release stage, the pull-out mechanism 5 pulls the separator 1 back to the right, and the free end is completely withdrawn from the sealing groove 3a. The upper and lower sections of the casting cavity a are connected, and the molten liquid enters the second casting cavity section a2 and fills the entire casting cavity.

[0037] Furthermore, the first module 2 is a fixed mold, and the second module 3 is a moving mold. With the above configuration, the second module 3 (moving mold) closes with the first module 2 (fixed mold) from left to right, and retracts to the left when the mold opens. The separator 1 is slidably assembled within the fixed mold, and after mold closing, it slides to the left and extends into the sealing groove 3a of the moving mold. When the mold opens, it remains within the fixed mold. Even if there is solidified sprue in the sealing groove 3a, it will not be embedded or engaged due to the smoothness of the first sidewall 3a1. When the moving mold opens, the sprue smoothly exits from the sealing groove 3a without causing demolding interference. It should be understood that the fixed and moving mold identities of the first module 2 and the second module 3 are not limited to the configuration described in this embodiment, and can be interchanged in other embodiments, as long as the separator 1 and the sealing groove 3a are located on opposite sides that can be inserted into each other when the mold closes.

[0038] Please refer to Figure 1 and Figure 2 As shown, the process of using the vacuum die-casting mold in this embodiment is as follows: Mold closing: The second mold 3 (moving mold) moves from left to right and closes with the first mold 2 (fixed mold). The separator 1 slides to the left and its free end is inserted into the sealing groove 3a, dividing the casting cavity a into the upper second casting cavity section a2 and the lower first casting cavity section a1.

[0039] Sealing stage: The third air passage b3 switches to connect to the atmosphere. The first casting cavity section a1 is evacuated to a higher vacuum degree through the first air passage b1, and the second casting cavity section a2 is evacuated to a lower vacuum degree through the second air passage b2. The pressure difference between the atmospheric pressure in the pressure groove 3b and the negative pressure in the casting cavity section drives the pressure applying component 4 to move downward to the extended position, abutting against the upper surface of the separator 1 and pressing it against the first side wall 3a1. At the same time, the pressure difference between the first casting cavity section a1 and the second casting cavity section a2 causes the separator 1 to further abut against the first side wall 3a1, forming a double seal.

[0040] Die casting filling: The molten liquid enters the first casting cavity section a1 through the molten liquid inlet c and gradually fills the cavity.

[0041] Release phase: After the first casting cavity section a1 reaches the filling threshold, the vacuum valve of the first air passage b1 is closed, and the vacuum degree of the first casting cavity section a1 drops to be equal to that of the second casting cavity section a2, and the pressure difference between adjacent casting cavity sections disappears; the third air passage b3 switches to connect to the negative pressure source, and the negative pressure configured by the pressure regulating device is input into the pressure application groove 3b. The pressure difference between the negative pressure in the pressure application groove 3b and the negative pressure in the casting cavity section drives the pressure application component 4 to move upward to the retraction position, with the rear end abutting against the limiting step surface 3b1 and the front end flush with the opening of the pressure application groove 3b, and the separator 1 disengages from the sealing groove 3a.

[0042] Extraction and filling: The extraction mechanism 5 completely extracts the separator 1 from the sealing groove 3a to the right, connecting the upper and lower sections of the casting cavity a. The molten liquid enters the second casting cavity section a2 and fills the entire casting cavity, completing the die casting.

[0043] In summary, this invention, while ensuring the sealing performance of the separator, improves the stability of the sealing pressure mechanism, eliminates interference between the sealing surface and the demolding, simplifies the power configuration, and achieves adjustable sealing force, thereby improving the casting quality and production efficiency of segmented vacuum die casting and is suitable for the sealing requirements of segmented vacuum die casting molds.

[0044] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A vacuum die-casting mold, characterized in that, include: Separator; The first module, wherein the separator is slidably assembled inside the first module along the mold closing direction of the first module; The second module is molded with the first module to form a casting cavity. The molded side of the second module has a sealing groove for the free end of the separator to be inserted. The sealing groove has a first sidewall and a second sidewall with opposite sides. The first sidewall faces the molten liquid inlet and is a smooth surface. The second sidewall has a pressure groove. The pressure-applying component is sealed and slidably assembled within the pressure-applying groove; When the mold is closed, the separator is inserted into the sealing groove to seal and divide the casting cavity into two casting cavity sections; the air pressure in the pressure groove is adjustable, and the pressure member moves between the extended position and the retracted position through the pressure difference between the pressure groove and the casting cavity section; in the extended position, the pressure member extends into the sealing groove and abuts against the separator to apply pressure so that the separator abuts against the first side wall.

2. The vacuum die-casting mold according to claim 1, characterized in that: The pressure groove is provided with a limiting step surface; In the retracted position, one end of the pressure-applying member facing the bottom of the pressure groove abuts against the limiting step surface, and the other end of the pressure-applying member facing the sealing groove is flush with the opening of the pressure groove.

3. The vacuum die-casting mold according to claim 1, characterized in that: The pressure tank can be selectively connected to the atmosphere or a negative pressure source; When the pressure groove is connected to the atmosphere, the pressure difference between the pressure inside the pressure groove and the pressure inside the casting cavity section drives the pressure-applying component to move to the extended position; When the pressure tank is connected to the negative pressure source, the pressure difference between the pressure in the pressure tank and the pressure in the casting cavity section drives the pressure-applying component to move to the retraction position.

4. A vacuum die-casting mold according to claim 3, characterized in that, Also includes: Vacuum equipment is used to evacuate the casting cavity section; A vacuum gauge is used to measure the vacuum level of the casting cavity section and the pressure tank.

5. A vacuum die-casting mold according to claim 4, characterized in that: The negative pressure source is provided by the vacuum equipment, and the pressure tank is connected to the vacuum equipment through an air passage.

6. A vacuum die-casting mold according to claim 5, characterized in that, It also includes a voltage regulating device; The pressure regulating device is located between the vacuum equipment and the pressure tank, and is used to adjust the negative pressure input to the pressure tank.

7. A vacuum die-casting mold according to claim 6, characterized in that: During the sealing stage of the separator, the vacuum level of the casting cavity section near the molten liquid inlet is higher than that of the other casting cavity section, and the pressure difference between the adjacent casting cavity sections causes the separator to press against the first sidewall. During the release phase of the separator, the vacuum level of the casting cavity section near the molten inlet is reduced to the same level as that of the other casting cavity section, and the pressure difference between the adjacent casting cavity sections disappears.

8. A vacuum die-casting mold according to claim 6, characterized in that, It also includes the control system; The control system is connected to the vacuum equipment and the vacuum gauge, and is used to control the vacuum equipment to perform vacuuming operations on each of the casting cavity sections according to the measurement value of the vacuum gauge, and to control the pressure tank to switch between being connected to the atmosphere and being connected to the negative pressure source.

9. A vacuum die-casting mold according to claim 1, characterized in that: It also includes a pull-out mechanism, which is disposed on the first module and connected to the separator, for completely pulling the separator out of the sealing groove.

10. A vacuum die-casting mold according to claim 1, characterized in that: The first module is a fixed mold, and the second module is a moving mold.

Images