Rubber mold vacuumizing device in wet bag method isostatic pressing forming process

Abstract

The utility model discloses a rubber mold vacuumizing device in a wet bag method isostatic pressing forming process. The rubber mold vacuumizing device comprises a vacuum flexible joint and a metal vacuumizing pipe, the vacuum flexible connector comprises an airflow pipe wall, a hollow airflow pipeline is arranged in the airflow pipe wall, a first opening and a second opening are formed in the top and the bottom of the airflow pipe wall respectively, a connector base is arranged at the bottom of the airflow pipe wall, and the airflow pipe wall and the connector base are integrally formed. The metal evacuating pipe comprises an evacuating pipeline, one end of the evacuating pipeline is in sealed connection with the pagoda nozzle, the other end of the evacuating pipeline is in sealed connection with the duck tongue nozzle, a plurality of annular grooves are formed in the pipe wall of the end, close to the duck tongue nozzle, of the evacuating pipeline, and dynamic sealing rings are arranged in the annular grooves. According to the utility model, the vacuum flexible joint and the metal evacuation pipe combined suite are arranged, so that the contact between the mold and the powder in the wet bag method isostatic pressing is realized, the stress residue after the powder material is pressed and formed is improved, and the safety risk in the pressing process is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of wet bag isostatic pressing technology for powder materials, in particular to a vacuum pumping device for a rubber mold in the wet bag isostatic pressing technology. Background Art

[0002] Isostatic pressing involves applying a forming force to the surface of an elastic mold, such as a rubber or plastic, through a pressure-transmitting medium. This compresses the powdered material within, forming a green body with a defined density and strength. The resulting molded product possesses the unique advantages of high density and isotropy. The vacuuming process, a key step in isostatic pressing, is particularly crucial. Traditional isostatic pressing vacuuming methods require extensive disassembly and assembly, resulting in labor-intensive, cumbersome, and numerous component replacements. In particular, the porous plate at the bottom of the heat-resistant unit contacts the explosive powder. After high-temperature and high-pressure pressing, hard and difficult-to-clean explosive residue forms within the plate. This creates stress concentration during the pressing process, leading to fracture and detachment of the product's charge riser, impacting product quality and safety. Therefore, optimizing the design of high-vacuum methods within rubber molds for wet-bag isostatic pressing to meet operational requirements is crucial, thereby reducing production line staff, increasing efficiency, and improving intrinsic safety. Utility Model Content

[0003] The purpose of the present invention is to provide a rubber mold vacuuming device in the wet bag isostatic pressing process in order to solve the above problems. The present invention realizes full contact between the mold and the powder during the wet bag isostatic pressing process, thereby improving the stress distribution state of the powder material after pressing and molding, reducing the safety risks during the pressing process, eliminating some auxiliary labor, simplifying the operation process, and thus achieving reduction in staff and increase in efficiency of the production line.

[0004] The utility model achieves the above-mentioned purpose through the following technical solutions:

[0005] A vacuum pumping device for a rubber mold in a wet bag isostatic pressing process, comprising a vacuum flexible joint and a metal vacuum pipe;

[0006] The vacuum flexible joint includes an airflow tube wall, the interior of the airflow tube wall is a hollow airflow duct, the top and bottom of the airflow tube wall are respectively provided with a first opening and a second opening, and the bottom of the airflow tube wall is provided with a joint base, and the airflow tube wall and the joint base are integrally formed;

[0007] The metal evacuation tube includes an evacuation pipe, one end of the evacuation pipe is sealed with the pagoda mouth, and the other end is sealed with the duckbill mouth. Several annular grooves are provided on the pipe wall of the evacuation pipe near the duckbill mouth, and dynamic sealing rings are provided in the annular grooves.

[0008] A further solution is that the diameters of the first opening and the second opening are smaller than the diameter of the air flow tube wall.

[0009] A further solution is that the wall thickness of the airflow tube wall gradually decreases from bottom to top.

[0010] The beneficial effects of the present invention are:

[0011] This utility model relates to a vacuum pumping device for rubber molds used in wet bag isostatic pressing processes. By installing a vacuum flexible joint and a metal evacuation tube assembly, this device ensures contact between the mold and the powder during wet bag isostatic pressing, improving residual stress in the powder material after molding and minimizing safety risks during the pressing process. Furthermore, the device simplifies operation, eliminating the need for replacement or cleaning of accessories, thereby reducing production line staff and increasing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0013] Figure 1 This is the structural diagram of the vacuum flexible joint of this utility model.

[0014] Figure 2 This is the structural diagram of the metal evacuation tube of the utility model.

[0015] Figure 3 This is a cross-sectional view of the air flow duct of the vacuum flexible joint of the utility model.

[0016] Figure 4 This is a structural diagram of the combined state of the utility model.

[0017] Figure 5 This is a structural diagram of the sealing state of the utility model. DETAILED DESCRIPTION

[0018] To make the purpose, technical solution, and advantages of the present invention more clear, the technical solution of the present invention will be described in detail below. Obviously, the embodiments described are only some of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0019] In any embodiment, Figure 1-3 As shown, the utility model is a rubber mold vacuuming device in a wet bag isostatic pressing process, comprising a vacuum flexible joint and a metal vacuuming pipe;

[0020] The vacuum flexible joint includes an airflow tube wall 1, the interior of the airflow tube wall 1 is a hollow airflow pipe 13, the top and bottom of the airflow tube wall 1 are respectively provided with a first opening 11 and a second opening 12, and the bottom of the airflow tube wall 1 is provided with a joint base 2, and the airflow tube wall 1 and the joint base 2 are integrally formed; the diameters of the first opening 11 and the second opening 12 are smaller than the diameter of the airflow tube wall 1.

[0021] The metal evacuation tube includes an evacuation pipe 3, one end of the evacuation pipe 3 is sealed with the pagoda mouth 31, and the other end is sealed with the duckbill mouth 5. Several annular grooves are provided on the pipe wall of the evacuation pipe 3 near the duckbill mouth 5, and a dynamic sealing ring 4 is provided in the annular groove.

[0022] The metal evacuation tube, constructed from a duralumin alloy, provides support for the flexible vacuum connector when used in conjunction with the vacuum connector, accommodating the pressure differential between the internal and external atmospheres. The tube's high surface finish allows for easy removal from component A. The pagoda nozzle 31 connects to the vacuum pump for quick insertion and removal. The duckbill nozzle 5 allows for regular deformation of the airflow duct 13 during disassembly and evacuation, ensuring gripping. The dynamic seal 4 prevents vacuum leakage during disassembly and evacuation.

[0023] The thickness of the air flow pipe wall 1 gradually decreases from bottom to top. Figure 3 Specifically, the thickness of the part where the wall thickness of the airflow duct changes is T=3-H / 50mm (0mm≤H≤100mm).

[0024] The bottom of the airflow duct (0mm ≤ H ≤ 40mm) is sealed to transmit high temperature and high pressure to the powder material. Therefore, its thickness is 3 to 2.5mm, the same as that of the rubber mold. This provides sufficient tear resistance to withstand the harsh environment inside the isostatic working cylinder.

[0025] The middle section (40mm≤H≤100mm) does not contact the powder material and can shrink freely in the working environment without deformation or tearing. However, it requires sufficient deformation and appropriate clamping strength. Its wall thickness is 2.5-1mm. This thickness can achieve the expected sealing effect and holding force.

[0026] The thickness above the top (100mm ≤ H) is less than 1mm. This section of the tube is relatively thin, with poor pressure resistance and high deformation capacity. The atmospheric pressure differential generated during vacuum pump operation makes it easier for the rubber material of the airflow duct and the metal evacuation tube to adhere tightly to each other, forming a sealed space and ensuring the vacuum drop rate.

[0027] If the vacuum joint airflow ducting had uniform wall thickness, performance wouldn't be well adapted to varying requirements. A 1mm thickness easily deforms but doesn't offer the same tear and deformation resistance as a rubber mold, posing a higher safety and rupture risk. A 3mm thickness is less sensitive to changes in atmospheric pressure, making it prone to vacuum leaks when the vacuum joint and metal evacuation tube assembly (in a vacuumed state) is operating. Therefore, the vacuum joint airflow ducting design incorporates a gradient wall thickness to accommodate the varying functional requirements of different locations.

[0028] How to use this utility model: refer to Figure 4-5 shown.

[0029] The vacuum flexible joint and metal evacuation tube are combined. The duckbill 5 of the metal evacuation tube is inserted into the bottom of the airflow duct 13 until it is in close contact with the second opening 12, creating a vacuum state. The pagoda nozzle 31 is connected to a vacuum pump. This state connects the rubber mold and the vacuum pump, forming an airflow channel between them. The vacuum equipment achieves a high vacuum within the rubber mold.

[0030] After the hollowing process is complete, a sealing clamp is used to hold the airflow tube wall 1. The metal evacuation tube is then slowly pulled out. The vacuum flexible joint now shrinks and fits under the force of atmospheric pressure. During this process, the sealing clamp is also used to tighten the vacuum flexible joint, creating a sealed state. The sealed assembly, together with the rubber mold, forms a sealed body, which is then placed into the working cylinder of the isostatic press for compression molding. This state is used to seal the rubber mold under high vacuum, isolating the powdered material inside from the liquid medium and transmitting the pressure and temperature within the working cylinder of the isostatic press.

[0031] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field can easily think of changes or replacements within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims. It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable way if there is no contradiction. In order to avoid unnecessary repetition, the present invention will no longer describe various possible combinations separately. In addition, the various different embodiments of the present invention can also be arbitrarily combined. As long as they do not violate the idea of ​​the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A vacuum pumping device for a rubber mold in a wet bag isostatic pressing process, characterized in that: Including vacuum flexible joint and metal evacuation tube; The vacuum flexible joint includes an airflow tube wall, the interior of the airflow tube wall is a hollow airflow duct, the top and bottom of the airflow tube wall are respectively provided with a first opening and a second opening, and the bottom of the airflow tube wall is provided with a joint base, and the airflow tube wall and the joint base are integrally formed; The metal evacuation tube includes an evacuation pipe, one end of the evacuation pipe is sealed with the pagoda mouth, and the other end is sealed with the duckbill mouth. Several annular grooves are provided on the pipe wall of the evacuation pipe near the duckbill mouth, and dynamic sealing rings are provided in the annular grooves.

2. The device for vacuuming a rubber mold in a wet bag isostatic pressing process according to claim 1, wherein: The diameters of the first opening and the second opening are smaller than the diameter of the air flow tube wall.

3. The device for vacuuming a rubber mold in a wet bag isostatic pressing process according to claim 1, wherein: The thickness of the air flow pipe wall gradually decreases from bottom to top.

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