Die casting mold with multi-stage sealing protection

Abstract

The utility model relates to die technical field discloses a die -casting die with multistage sealed protection, including die -casting die main part and install through hydraulic equipment horizontal sliding connection of die -casting die main body's movable die and static die, the surface fixed connection of movable die is close to static die has silica gel outer sealing member and silica gel inner sealing member, the utility model discloses adopt " silica gel outer sealing member + silica gel inner sealing member + negative pressure sealing assembly's multistage sealed structure, and the sealing performance of optimization traditional die -casting die, silica gel piece is reduced processing requirement and cost with the elasticity of making up die error, negative pressure assembly can also relieve the influence of die wear, prolongs the life of die, reduces maintenance cost, and negative pressure sealing assembly gives consideration to the stability of sealing and the convenience of opening die when closing die, and the sliding column drives sealing plate to form negative pressure when closing die, prevents metal overflow, and spring resets exhaust when opening die, and power opening die, and silica gel sealing member adapts pressure change, realizes two -way optimization of sealing and operation.

Description

Technical Field

[0001] This utility model relates to the field of mold technology, and more specifically to a die-casting mold with multi-level sealing protection. Background Technology

[0002] Die casting molds, short for pressure casting molds, are the core process equipment for producing die castings. Their working principle is to use a die casting machine to fill liquid or semi-liquid metal into the mold cavity at extremely high speed, and then solidify the metal under pressure to finally obtain die castings with specific shape and size requirements. They are widely used in various fields that require mass production of metal components.

[0003] In terms of sealing methods, traditional die-casting molds rely mainly on the precise fit of the two mold mating surfaces to achieve sealing between the moving and fixed molds. This sealing method places extremely high demands on the mold machining accuracy. Even a small flatness error, substandard surface roughness, or dimensional deviation can directly lead to seal failure. Once the seal fails, gaps are likely to appear between the molds when they are closed, causing liquid metal to overflow. This not only significantly increases the processing difficulty and production cost of the mold, but also, during the long-term use of the mold, if the machining accuracy decreases due to wear and other factors, the sealing performance will be severely affected. In contrast, the improved sealing method has a relatively low dependence on the mold machining accuracy. Through the compensation effect of the elastic frame and the auxiliary sealing method of vacuum negative pressure, it can make up for the deficiencies in the mold processing precision to a certain extent and effectively improve the sealing reliability. In addition, some mold structures use flexible sealing gaskets for sealing, but since the mold movement is mainly driven by hydraulic cylinders, if the pressure between the two molds is too large, it will cause the sealing element to deform. After long-term use, the sealing element is also prone to wear problems, all of which will affect the sealing effect. Conversely, if the pressure between the two molds is too small, the sealing element will directly lose its sealing function and fail to meet the sealing requirements. Utility Model Content

[0004] In order to overcome the above-mentioned defects of the prior art, the present invention provides a die-casting mold with multi-level sealing protection to solve the problems existing in the background art.

[0005] This utility model provides the following technical solution: a die-casting mold with multi-level sealing protection, including a die-casting mold body and a moving mold and a stationary mold mounted on the die-casting mold body and connected laterally by a hydraulic device. The moving mold has a silicone outer seal and a silicone inner seal fixedly connected to the surface near the stationary mold. The stationary mold has two sealing grooves on the surface near the moving mold. A negative pressure sealing component is installed at the connection between the moving mold and the stationary mold, and the input end of the negative pressure sealing component abuts against the surface of the stationary mold.

[0006] Furthermore, the negative pressure sealing assembly includes a sliding column laterally slidably connected inside the moving mold. One end of the sliding column abuts against the surface of the stationary mold, and the other end of the sliding column is fixedly connected to a sealing plate. The moving mold has a sliding groove and a sealing cavity inside. A tension spring is fixedly installed inside the sliding groove. Return springs are fixedly installed at equal intervals on the surface of the sealing plate. A sealing block is fixedly connected to the end of the return spring away from the sealing plate. An air inlet groove is fixedly opened at equal intervals on the surface of the moving mold near the stationary mold. An exhaust pipe communicating with the inside of the sealing cavity is fixedly connected inside the moving mold. A one-way valve is fixedly installed at the output end of the exhaust pipe.

[0007] Furthermore, the outer surfaces of both the outer and inner silicone seals are sealed and fitted inside the sealing groove, and the sealing cavity, sealing plate, outer silicone seal, inner silicone seal, and sealing groove are all frame-shaped.

[0008] Furthermore, the sliding column is U-shaped, and under normal conditions, the sliding column slides to the right by the tension of the tension spring, with the end face of the sliding column extending into the interior of the sealing cavity.

[0009] Furthermore, sealing rings are fixedly installed on both the outer surface and the inner wall of the sealing plate, and the outer surface of the sealing plate is laterally and slidably connected to the inside of the sealing cavity.

[0010] Furthermore, the sealing block is a silicone plate, the surface of the sealing block is attached to the end face of the air inlet groove, the interior of the sealing cavity is connected to the outside of the moving mold through an exhaust pipe and a one-way valve, and the output end of the one-way valve is located between the outer silicone seal and the inner silicone seal.

[0011] The technical effects and advantages of this utility model are as follows:

[0012] 1. This utility model significantly optimizes the sealing performance of traditional die-casting molds through a multi-stage sealing structure consisting of an outer silicone seal, an inner silicone seal, and a negative pressure sealing assembly. Compared to traditional sealing methods that rely on precise mold fit, the silicone seal can compensate for minor flatness errors or dimensional deviations on the mold surface through its own elasticity, reducing sealing failures caused by insufficient processing precision. This reduces the stringent requirements for mold processing precision, decreases processing difficulty and production costs. Furthermore, even if the mold experiences a decrease in precision due to wear during long-term use, the negative pressure sealing assembly can further enhance the tightness of the fit between the moving and stationary molds through the negative pressure within the cavity, mitigating the impact of seal wear on the sealing effect, extending the overall service life of the mold, and reducing maintenance frequency and costs.

[0013] 2. The negative pressure sealing component of this utility model is designed to balance the sealing stability during mold closing and the ease of operation during mold opening. During mold closing, the sliding column is driven by the static mold to move the sealing plate, creating negative pressure in the sealing cavity. Combined with the pressure control of the sealing block by the return spring, this design not only prevents air from entering prematurely and affecting the sealing effect, but also enhances the fit between the moving and static molds through negative pressure adsorption after the sealing components are in place, preventing liquid metal from overflowing. During mold opening, the tension spring drives the sliding column to return to its original position, and the air pressure in the sealing cavity is discharged through the exhaust pipe, increasing the cavity pressure between the silicone sealing components. This assists the hydraulic equipment in easily separating the mold, avoiding difficulties in mold opening due to excessive negative pressure. In addition, the silicone sealing block and sealing components have good flexibility and high temperature resistance, which can adapt to pressure changes during mold closing. This design prevents excessive deformation of the sealing components due to excessive pressure, and also prevents loss of sealing function due to insufficient pressure, achieving a two-way optimization of sealing performance and ease of operation. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of the moving mold and the stationary mold after they are joined together in this utility model;

[0015] Figure 2 This is a schematic diagram of the connection structure of the moving mold, the outer silicone seal, and the inner silicone seal in this utility model;

[0016] Figure 3 This is a schematic diagram of the static mold and sealing groove structure in this utility model;

[0017] Figure 4 for Figure 1 A longitudinal sectional view;

[0018] Figure 5 for Figure 4 Enlarged view of point A in the middle.

[0019] The attached figures are labeled as follows: 1. Die-casting mold body; 2. Moving mold; 3. Stationary mold; 4. Silicone outer seal; 5. Silicone inner seal; 6. Sealing groove; 7. Negative pressure sealing assembly; 71. Sliding column; 72. Slide groove; 73. Tension spring; 74. Sealing cavity; 75. Sealing plate; 76. Return spring; 77. Sealing block; 78. Air inlet groove; 79. Exhaust pipe. Detailed Implementation

[0020] The present invention will be further described below with reference to specific embodiments. However, those skilled in the art should understand that the detailed description given here with reference to the accompanying drawings is for better explanation. The structure of the present invention may exceed the limited embodiments described herein. Some equivalent alternatives or common means will not be described in detail here, but they still fall within the protection scope of this application.

[0021] Figures 1-5This is the preferred embodiment of the present invention, which is described below in conjunction with the appendix. Figures 1-5 The present invention will be further described below.

[0022] A die-casting mold with multi-level sealing protection includes a die-casting mold body 1 and a moving mold 2 and a stationary mold 3 that are installed on the die-casting mold body 1 and laterally slidably connected by a hydraulic device. A silicone outer seal 4 and a silicone inner seal 5 are fixedly connected to the surface of the moving mold 2 near the stationary mold 3. Two sealing grooves 6 are opened on the surface of the stationary mold 3 near the moving mold 2. A negative pressure sealing component 7 is installed at the connection between the moving mold 2 and the stationary mold 3, and the input end of the negative pressure sealing component 7 abuts against the surface of the stationary mold 3.

[0023] In this embodiment, the dual silicone sealant and the sealing groove 6 are precisely matched to form an initial sealing barrier, which can initially prevent the leakage of liquid metal and lay the foundation for the subsequent function of the negative pressure sealing component 7.

[0024] The input end of the negative pressure sealing component 7 abuts against the surface of the stationary mold 3, and can respond to the mold closing action in real time, ensuring that the negative pressure sealing function is activated in time during the mold closing process, avoiding metal overflow caused by delayed sealing. This structural layout rationally distributes different sealing components on the moving mold 2 and the stationary mold 3, which facilitates mold processing and assembly, and also makes it easier to maintain or replace individual sealing components in the later stage, reducing maintenance difficulty.

[0025] Specifically, the negative pressure sealing assembly 7 includes a sliding column 71 that is laterally slidably connected inside the moving mold 2. One end of the sliding column 71 abuts against the surface of the stationary mold 3, and the other end of the sliding column 71 is fixedly connected to a sealing plate 75. The moving mold 2 has a sliding groove 72 and a sealing cavity 74. A tension spring 73 is fixedly installed inside the sliding groove 72. A return spring 76 is fixedly installed at equal intervals on the surface of the sealing plate 75. A sealing block 77 is fixedly connected to the end of the return spring 76 away from the sealing plate 75. An air inlet groove 78 is equidistantly opened on the surface of the moving mold 2 near the stationary mold 3. An exhaust pipe 79 that communicates with the inside of the sealing cavity 74 is fixedly connected inside the moving mold 2. A one-way valve is fixedly installed at the output end of the exhaust pipe 79.

[0026] In this embodiment, the sliding column 71 is designed with a lateral sliding connection, which can accurately transmit the pressure of the mold 3, ensure that the sealing plate 75 can be stably driven to move when the mold is closed, provide power for the formation of negative pressure in the sealing cavity 74, and ensure the reliability of the negative pressure seal.

[0027] The tension spring 73 and the return spring 76 enable the automatic reset function of each component, eliminating the need for additional power drive, simplifying the mold structure, reducing energy consumption, and ensuring that the components can quickly return to their initial state after the mold opening and closing actions, thereby improving the working efficiency of the mold.

[0028] The air intake slot 78 can control airflow at specific stages and, together with the sealing block 77, can achieve precise adjustment of the air pressure in the sealing cavity 74; the exhaust pipe 79, combined with the one-way valve, can directionally discharge the gas in the sealing cavity 74 and prevent external gas backflow, ensuring a stable negative pressure state in the sealing cavity 74 and enhancing the sealing effect.

[0029] Specifically, the outer surfaces of the silicone outer seal 4 and the silicone inner seal 5 are sealed and fitted inside the sealing groove 6. The sealing cavity 74, the sealing plate 75, the silicone outer seal 4, the silicone inner seal 5 and the sealing groove 6 are all frame-shaped.

[0030] In this implementation scheme, the silicone sealant is sealed and fitted with the sealing groove 6, which greatly increases the sealing contact area, improves the initial sealing tightness, and effectively reduces the possibility of liquid metal overflowing from the gaps in the contact surface. The frame structure allows each component to form a complete sealing ring around the mold cavity without any sealing dead corners. Whether it is silicone sealing or negative pressure sealing, it can fully cover the sealing area, further ensuring sealing reliability. The uniform frame design facilitates the size matching between each component, reduces the impact of processing errors on the sealing effect, and also makes the overall structure of the mold more regular, which is beneficial for the installation and positioning of the mold on the die-casting machine.

[0031] Specifically, the sliding column 71 is U-shaped. Under normal conditions, the sliding column 71 slides to the right due to the tension of the tension spring 73, and the end face of the sliding column 71 extends into the interior of the sealing cavity 74.

[0032] In this embodiment, the "U"-shaped sliding column 71 can contact the stationary mold 3 from both sides at the same time, so that the force is more even and avoids the sliding column 71 tilting due to the force on one side, ensuring that its lateral sliding is smooth, thereby ensuring that the sealing plate 75 moves smoothly and preventing the negative pressure of the sealing cavity 74 from being unstable.

[0033] Under normal conditions, the tension spring 73 pulls the sliding column 71 to slide to the right, so that the sliding column 71 always tends to be in contact with the stationary mold 3, ensuring a rapid response when the mold is closed and avoiding sealing delay due to the initial position deviation of the sliding column 71.

[0034] The end face of the sliding column 71 extends into the sealing cavity 74, which can directly drive the sealing plate 75, reduce power transmission links, reduce power loss, improve the sensitivity of the movement of the sealing plate 75, ensure the speed of negative pressure formation in the sealing cavity 74, and improve sealing efficiency.

[0035] Specifically, sealing rings are fixedly installed on both the outer surface and the inner wall of the sealing plate 75, and the outer surface of the sealing plate 75 is laterally and slidably connected to the inside of the sealing cavity 74.

[0036] In this embodiment, the double installation of the sealing ring (outer surface and inner wall) eliminates the gap between the sealing plate 75 and the sealing cavity 74, prevents gas in the sealing cavity 74 from leaking from the contact gap, ensures that the sealing cavity 74 can stably maintain a negative pressure state, and guarantees the sealing effect.

[0037] The transverse sealing sliding connection method ensures the smooth movement of the sealing plate 75 within the sealing cavity 74 without affecting the negative pressure formation process, and maintains a continuous sealing state during movement, preventing sealing failure due to the movement of the sealing plate 75. This structure can extend the service life of the sealing plate 75 and the sealing cavity 74. The sealing ring can reduce direct friction between the two, reduce the wear rate of components, reduce the frequency of maintenance and replacement, and reduce the cost of mold use.

[0038] Specifically, the sealing block 77 is a silicone plate, and the surface of the sealing block 77 is attached to the end face of the air inlet groove 78. The interior of the sealing cavity 74 is connected to the outside of the moving mold 2 through the exhaust pipe 79 and the one-way valve, and the output end of the one-way valve is located between the silicone outer seal 4 and the silicone inner seal 5.

[0039] In this embodiment, the silicone plate sealing block 77 has good elasticity and sealing performance. When it fits the end face of the air inlet groove 78, it can tightly seal the air inlet channel. At the same time, it can deform appropriately when under pressure, so as to avoid damage to the sealing block 77 or the air inlet groove 78 due to rigid contact and extend the service life of the components.

[0040] The sealing cavity 74 is connected to the outside through the exhaust pipe 79 and the one-way valve, which can precisely control the gas discharge in the sealing cavity 74. The one-way valve prevents gas backflow and ensures the stable negative pressure in the sealing cavity 74. The output end is located between the two silicone seals. The discharged gas can form a certain air pressure between the two seals to assist in mold opening. At the same time, it can also enhance the fit between the two seals and the sealing groove 6 when the mold is closed. This design enables the sealing block 77, the exhaust pipe 79 and the one-way valve to form a collaborative working mechanism, realizing bidirectional adjustment of the air pressure inside and outside the sealing cavity 74. This not only ensures the sealing effect when the mold is closed, but also assists in the mold opening operation, improving the overall stability and convenience of the mold operation.

[0041] The working principle and usage process of this utility model are as follows: During use, when the hydraulic drive device moves the moving mold 2 away from the stationary mold 3, the pressure on the end face of the sliding column 71 against the stationary mold 3 decreases. Through the tension of the tension spring 73, the sliding column 71 slides closer to the stationary mold 3. At this time, the pressure inside the sealing cavity 74 gradually increases. The air pressure inside the sealing cavity 74 is discharged through the exhaust pipe 79 and the one-way valve. At this time, the pressure in the cavity between the moving mold 2 and the stationary mold 3 at the connection between the outer silicone seal 4 and the inner silicone seal 5 increases. With the help of the hydraulic device, the moving mold 2 and the stationary mold 3 can be easily separated. When the hydraulic drive device moves the moving mold 2 closer to the stationary mold 3, the pressure of the stationary mold 3 on the sliding column 71... The sliding column 71 slides away from the stationary mold 3, and the sliding column 71 drives the sealing plate 75 to slide to the left. At this time, the sealing cavity 74 is under negative pressure. However, due to the elasticity of the return spring 76, the sealing block 77 still blocks the air inlet groove 78, preventing external air from entering the sealing cavity 74 before the silicone outer seal 4 and silicone inner seal 5 are sealed on the inner wall of the sealing groove 6. When the sealing plate 75 slides to the left a certain distance, the negative pressure inside the sealing cavity 74 also reaches a certain level. The pressure of the return spring 76 on the sealing block 77 decreases, and the air in the cavity between the silicone outer seal 4 and silicone inner seal 5 enters the sealing cavity 74 through the air inlet groove 78 and is under negative pressure, so that the surfaces of the moving mold 2 and the stationary mold 3 are tightly fitted.

[0042] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model in any other way. Any person skilled in the art may make changes or modifications to the disclosed technical content to create equivalent embodiments. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of this utility model without departing from its scope of protection shall still fall within the protection scope of this utility model.

Claims

1. A die-casting mold with multi-stage sealing protection, comprising a die-casting mold body (1) and a moving mold (2) and a stationary mold (3) mounted on the die-casting mold body (1) and laterally slidably connected by a hydraulic device, characterized in that: The moving mold (2) is fixedly connected to the surface of the stationary mold (3) with a silicone outer seal (4) and a silicone inner seal (5). The surface of the stationary mold (3) near the moving mold (2) has two sealing grooves (6). A negative pressure sealing assembly (7) is installed at the connection between the moving mold (2) and the stationary mold (3). The input end of the negative pressure sealing assembly (7) abuts against the surface of the stationary mold (3).

2. The die-casting mold with multi-level sealing protection according to claim 1, characterized in that: The negative pressure sealing assembly (7) includes a sliding column (71) that is laterally slidably connected inside the moving mold (2). One end of the sliding column (71) abuts against the surface of the stationary mold (3), and the other end of the sliding column (71) is fixedly connected to a sealing plate (75). The moving mold (2) has a sliding groove (72) and a sealing cavity (74) inside. A tension spring (73) is fixedly installed inside the sliding groove (72). A return spring (76) is fixedly installed at equal intervals on the surface of the sealing plate (75). A sealing block (77) is fixedly connected to the end of the return spring (76) away from the sealing plate (75). An air inlet groove (78) is fixedly opened at equal intervals on the surface of the moving mold (2) near the stationary mold (3). An exhaust pipe (79) that communicates with the inside of the sealing cavity (74) is fixedly connected inside the moving mold (2). A one-way valve is fixedly installed at the output end of the exhaust pipe (79).

3. A die-casting mold with multi-level sealing protection according to claim 2, characterized in that: The outer surfaces of the silicone outer seal (4) and the silicone inner seal (5) are sealed and fitted inside the sealing groove (6). The sealing cavity (74), the sealing plate (75), the silicone outer seal (4), the silicone inner seal (5) and the sealing groove (6) are all frame-shaped.

4. A die-casting mold with multi-level sealing protection according to claim 2, characterized in that: The sliding column (71) is U-shaped. Under normal conditions, the sliding column (71) slides to the right by the tension of the tension spring (73), and the end face of the sliding column (71) extends into the interior of the sealing cavity (74).

5. A die-casting mold with multi-level sealing protection according to claim 2, characterized in that: The outer surface and inner wall of the sealing plate (75) are both fixedly installed with sealing rings, and the outer surface of the sealing plate (75) is laterally sealed and slidably connected to the inside of the sealing cavity (74).

6. A die-casting mold with multi-level sealing protection according to claim 2, characterized in that: The sealing block (77) is a silicone plate. The surface of the sealing block (77) is attached to the end face of the air inlet groove (78). The interior of the sealing cavity (74) is connected to the exterior of the moving mold (2) through the exhaust pipe (79) and the one-way valve. The output end of the one-way valve is located between the silicone outer seal (4) and the silicone inner seal (5).

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