Pressing and sealing tool for port of cold isostatic pressing forming flexible mold

Abstract

The utility model discloses a port compressing and sealing tool for a cold isostatic pressing forming flexible mold. The port compressing and sealing tool comprises an arc-shaped pressing plate, a steel wire rope, a movable block and a bolt. The arc-shaped pressing plate is provided with grooves for the steel wire rope to penetrate through from the two ends to the middle. The outer side of the arc-shaped pressing plate is fixedly connected with a fixed block, and a bolt sequentially penetrates through the fixed block and the movable block and then is sleeved with a nut. The two ends of the steel wire rope penetrate through the grooves from the inner sides of the arc-shaped pressing plates and then are fixedly connected to the fixed block and the movable block correspondingly. The movable block can move on the outer side of the arc-shaped pressing plate under the matching effect of the bolt and the nut, and then the steel wire rope and the arc-shaped pressing plate are driven to be pressed and sealed or loosened together. The sealing device solves the problem that sealing is not tight due to interface gaps in conventional bolt connection sealing, and is particularly suitable for sealing of isostatic pressing flexible molds needing strong fastening in high-pressure forming of large products.

Description

Technical Field

[0001] The utility model relates to a fixture for flexible mold sealing, in particular to a cold isostatic pressing forming flexible mold port pressing and sealing tool, which is particularly suitable for the pressing and sealing of the port of a flexible mold in wet bag cold isostatic pressing forming. Background Art

[0002] Cold isostatic pressing is a powder forming process under high pressure, which is divided into two types: wet bag type and dry bag type. Most traditional cold isostatic presses are of the wet bag type. Usually, flexible materials such as nitrile rubber, silicone rubber, latex, and polyurethane plastics are used as the mold sleeve (commonly known as the rubber sleeve) materials. The powder blank is filled and sealed, and large products also need to be evacuated and then placed into the press cylinder body. Using liquid as the pressure transmission medium, the same pressure is applied in all directions, and after pressurization - pressure holding - pressure release, it is pressed into a predetermined shape.

[0003] The port sealing of the mold sleeve is the key link in the current wet bag cold isostatic pressing process. The flexible sleeve, high - pressure environment, and liquid medium are the difficulties that need to be overcome in port sealing. If the sealing is not tight or the seal fails under high pressure, the liquid medium will enter the sleeve, resulting in the scrapping of the formed blank.

[0004] At present, there are many methods for sealing the port of the mold rubber sleeve. For large rubber sleeves, the method of folding the port rubber sheet and then clamping it with multiple layers of splints is mostly adopted. For smaller rubber sleeves, the method of expanding a rubber plug and fastening it with a hoop or steel wire is mostly used. Steel belt hoops or elastic clamps are mostly used in the case of thinner rubber sleeves and low - pressure forming. Since the thread teeth of the hoop are prone to deformation and failure, they cannot be used for thicker rubber sleeves that require strong tightening. Although the steel wire or double - steel - wire hoop can bear greater force, due to its small adjustment distance, it can only be used for some small products and has extremely low versatility. As for the method of steel wire bundling, although strong force can be applied, it has a short service life, high labor intensity, and unstable sealing effect. For the fastening device using threaded connection, such as the fixtures for flexible mold sealing disclosed in the utility model CN205704879U and CN2713275Y, there is always a certain gap between the locking ends during use. The rubber sleeve at this gap does not have an inward - receiving pressing force during fastening, not only cannot form a complete fitting and pressing seal, but may also be extruded outward and peeled off. In this case, two sets of fixtures are often required to solve the gap problem, reducing the production efficiency. Content of the Utility Model

[0005] Aiming at the above - mentioned technical problems and the deficiencies in this field, the utility model provides a cold isostatic pressing forming flexible mold port pressing and sealing tool. By pressing through the method of setting an arc - shaped pressing plate under the fastening joint, the flexible mold (referred to as the "rubber sleeve" in the utility model) can be tightly attached to the arc - shaped pressing plate, so that a complete fitting and pressing is formed at the port of the rubber sleeve during fastening, improving the connection sealing degree.

[0006] A cold isostatic pressing flexible die port pressing and sealing tool, comprising an arc-shaped pressing plate, a steel wire rope, a movable block and a bolt;

[0007] The arc-shaped pressing plate is provided with grooves for the steel wire rope to pass through from both ends to the middle;

[0008] A fixed block is fixedly connected to the outer side of the arc-shaped pressing plate. The bolt passes through the fixed block and the movable block in sequence and is sleeved with a nut; both ends of the steel wire rope pass through the grooves from the inner side of the arc-shaped pressing plate and are respectively fixedly connected to the fixed block and the movable block;

[0009] The movable block can move on the outer side of the arc-shaped pressing plate under the cooperation of the bolt and the nut (the specific moving mode can be sliding, etc.), thereby driving the steel wire rope and the arc-shaped pressing plate to press and seal or loosen together.

[0010] Herein, a method for using the above cold isostatic pressing flexible die port pressing and sealing tool to realize pressing and sealing by the cooperation of the arc-shaped pressing plate and the steel wire rope is introduced, including:

[0011] 1) Combine the movable block with the fixed block, the arc-shaped pressing plate and the nut through the bolt to form a closed hoop form, and maintain a relatively loose radial dimension.

[0012] 2) Sleeve the combined sealing tool onto the position of the rubber sleeve port that needs to be tightened, pay attention to putting the steel wire rope into the middle groove of the arc-shaped pressing plate and keeping it flat. If more than two strands of steel wire rope are used, it is necessary to straighten them to prevent the multi-strand ropes from being intertwined and affecting the sealing.

[0013] Of course, it is also possible to first place the sealing tool around the appropriate position of the rubber sleeve port, and then implement step 1). Specifically, the appropriate process steps can be adopted according to the operating space and personal preference.

[0014] 3) Tighten the bolt. The movable block moves along the arc-shaped pressing plate towards the fixed block under the pulling of the bolt, and the steel wire rope is gradually tightened. The steel wire rope and the arc-shaped pressing plate form a gapless and complete pressing restraint on the rubber sleeve port until the required restraint strength is reached, and the tightening and sealing operation is completed.

[0015] 4) After use, perform the disassembly operation in the reverse order to remove the sealing tool.

[0016] The installation operation of the above sealing tool can be simplified. That is, for the continuously used rubber sleeve die, the sealing tool can not be removed. After each pressing cycle is completed, the bolt can be loosened to remove the rubber sleeve. The whole set of sealing tools can move with the rubber sleeve. When the next cycle starts, it can be directly tightened.

[0017] Tightening the bolt to tighten the steel wire rope can fasten the rubber sleeve. The length of the bolt should be matched with the dimensions of the rubber sleeve, the arc-shaped pressing plate and the steel wire rope, and there should be a certain margin.

[0018] In some embodiments, for the cold isostatic pressing flexible die port compression sealing tool, the thickness of the arc-shaped pressing plate can be 3 - 5 mm, the width can be 20 - 30 mm, the arc length can be 1 / 4 - 1 / 5 of the circumference of the flexible die port, and the corresponding circumferential diameter can be 0.9 - 1.2 times the minimum outer diameter of the flexible die port after being compressed and shrunk under isostatic pressing. The arc-shaped pressing plate with the above parameter dimensions can be well matched with the outer diameter size of the rubber sleeve in terms of arc, etc. For example, a thickness of 3 - 5 mm can achieve the mechanical strength required for general cold isostatic pressing sealing, and a width of 20 - 30 mm can meet the requirement of constricting the mouth. After fastening, the rubber sleeve is compressed between the two joints (fixed block and movable block) to form a complete fitting seal. The sealing tool of the present utility model can be made into a general-purpose product, that is, one product can be applicable to the sealing of rubber sleeves with different outer diameters within a certain clamping range according to the arc of the arc-shaped pressing plate, the length of the steel wire rope, and the adjustable length of the bolt. For example At this time, the arc design of the arc-shaped pressing plate can be selected with the pressing size of the rubber sleeve when it is closest to the middle value (such as ) as a reference.

[0019] For the cold isostatic pressing flexible die port compression sealing tool, the steel wire rope is used to tighten the rubber sleeve and can be one or more. Multiple steel wire ropes can enhance the fastening strength and cross-sectional area. Further, the single diameter of the steel wire rope can be 3 - 10 mm, and the minimum breaking tensile force of a single wire rope is preferably ≥10 kN, and a high-strength tensile model can be specifically selected according to the thickness of the rubber sleeve. The length of the steel wire rope can be calculated according to the size after the rubber sleeve is tightened. By way of example, the steel wire rope can specifically be a 304 stainless steel multi-strand metal core steel wire rope.

[0020] In some embodiments, for the cold isostatic pressing flexible die port compression sealing tool, the arc-shaped pressing plate can be a metal plate, such as a hard stainless steel plate, etc.

[0021] In some embodiments, for the cold isostatic pressing flexible die port compression sealing tool, the fixed block and / or the movable block can be a metal block, such as a rectangular stainless steel block, etc.

[0022] In some embodiments, for the cold isostatic pressing flexible die port compression sealing tool, the nut can be fixedly connected (such as welded) to the movable block. In this way, it can only be tightened or loosened by rotating the bolt, otherwise both the bolt and the nut can be rotated to be tightened or loosened.

[0023] In some embodiments, for the cold isostatic pressing flexible die port compression sealing tool, the length of the groove satisfies that there is no gap between the interfaces of the steel wire rope, the arc-shaped pressing plate, and the flexible die port, and the steel wire rope will not be tangentially restricted by the arc-shaped pressing plate.

[0024] In some embodiments, for the cold isostatic pressing flexible mold port pressing and sealing tool, slot holes may be formed in the fixed block and the movable block, and bolts pass through the slot holes and can adjust the inclination angle within the restricted space range of the slot holes.

[0025] In some embodiments, for the cold isostatic pressing flexible mold port pressing and sealing tool, both ends of the steel wire rope can be welded to the fixed block and the movable block in a perforating manner, which is beneficial to enhancing the welding strength.

[0026] In some embodiments, for the cold isostatic pressing flexible mold port pressing and sealing tool, gaskets may be provided on the opposite surfaces of the fixed block and the movable block.

[0027] In some embodiments, for the cold isostatic pressing flexible mold port pressing and sealing tool, the bolts and nuts can be applied to an electric or pneumatic mechanical twist-shear wrench to improve labor efficiency, and it is better to use a fixed-torque wrench to tighten and loosen the connecting bolts.

[0028] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0029] By providing a structure with a grooved arc-shaped pressing plate between the two joints at the fixed end and the movable end of the steel wire rope, the port of the rubber sleeve is completely squeezed and sealed, avoiding the problem of poor sealing due to the interface gap in the conventional bolt connection sealing. It is especially suitable for the sealing of high-pressure forming of large products that require strong fastening of the isostatic pressing flexible mold. At the same time, the sealing tool of the present utility model is easy to process and manufacture, fast in manufacturing, low in cost, fast and simple in installation and disassembly operation, and high in reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic structural diagram of the cold isostatic pressing flexible mold port pressing and sealing tool for the embodiment.

[0031] Figure 2 It is a schematic structural diagram of the arc-shaped pressing plate and the fixed block of the cold isostatic pressing flexible mold port pressing and sealing tool for the embodiment. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0032] The present utility model will be further described below in conjunction with the accompanying drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the present utility model and not to limit the scope of the present utility model.

[0033] See Figure 1 、 Figure 2, the cold isostatic pressing flexible mold port pressing and sealing tool of this embodiment includes an arc-shaped pressing plate 1, a steel wire rope 2, a movable block 4, and a bolt 5. The arc-shaped pressing plate 1 is provided with grooves for the steel wire rope 2 to pass through from both ends to the middle. A fixed block 3 is fixedly connected to the outside of the arc-shaped pressing plate 1. The fixed block 3 and the movable block 4 are provided with slot holes, and the bolt 5 passes through the slot holes and can adjust the inclination angle within the limited space of the slot holes. A nut 6 is sleeved after the bolt 5 passes through the fixed block 3 and the movable block 4 in sequence. Gaskets 7 are provided on the opposite sides of the fixed block 3 and the movable block 4. Both ends of the steel wire rope 2 pass through the grooves from the inside of the arc-shaped pressing plate 1 and are welded and fixed to the positions close to the arc-shaped pressing plate 1 on the fixed block 3 and the movable block 4 in a perforated manner.

[0034] The movable block 4 can move outside the arc-shaped pressing plate 1 under the combined action of the bolt 5 and the nut 6, thereby driving the steel wire rope 2 to press and seal or relax together with the arc-shaped pressing plate 1.

[0035] In this embodiment, the length of the groove satisfies that there is no gap between the interfaces of the steel wire rope 2, the arc-shaped pressing plate 1, and the flexible mold port, and the steel wire rope 2 will not be tangentially restricted by the arc-shaped pressing plate 1.

[0036] The thickness of the arc-shaped pressing plate 1 is 3 - 5 mm, the width is 20 - 30 mm, the arc length is 1 / 4 - 1 / 5 of the circumference of the flexible mold port, and the corresponding circumferential diameter is 0.9 - 1.2 times the minimum outer diameter of the flexible mold port when it is pressed and shrunk to the minimum under isostatic pressing.

[0037] The steel wire rope 2 can be one or more. The single diameter of the steel wire rope 2 is 3 - 10 mm, and the minimum breaking force of a single root ≥ 10 kN.

[0038] The arc-shaped pressing plate 1 is a metal plate, and the fixed block 3 and the movable block 4 are metal blocks.

[0039] The nut 6 can be fixedly connected to the movable block 4 or not fixedly connected to the movable block 4.

[0040] When using the cold isostatic pressing flexible mold port pressing and sealing tool of this embodiment, first combine the movable block 4 with the fixed block 3, the arc-shaped pressing plate 1, the nut 6, and the gasket 7 through the bolt 5 to form a closed hoop form, maintaining a relatively loose radial dimension; then put the combined sealing tool on the position where the rubber sleeve port needs to be tightened, and pay attention to putting the steel wire rope 2 into the middle groove of the arc-shaped pressing plate 1 and keeping it flat; tighten the bolt 5, and the movable block 4 slides along the arc-shaped pressing plate 1 towards the fixed block 3 under the pulling of the bolt 5, the steel wire rope 2 is gradually tightened, and the steel wire rope 2 and the arc-shaped pressing plate 1 form a gapless and complete pressing restraint on the rubber sleeve port until the required restraint strength is reached, completing the tightening and sealing operation. After use, perform the disassembly operation in the reverse order to release the sealing tool.

[0041] Through the above method, the problem of poor sealing due to interface gaps in conventional bolt connection sealing is solved. Especially when a large product needs to be strongly fastened to a flexible mold during isostatic high-pressure forming, the traditional hoop seal has low fastening strength and the bolt connection has poor sealing effect. The compression sealing device provided by the present utility model has high fastening strength, is easy to operate, and has high sealing safety.

[0042] In addition, it should be understood that after reading the above description of the present utility model, those skilled in the art can make various changes or modifications to the present utility model, and these equivalent forms also fall within the scope defined by the appended claims of this application.

Claims

1. A cold isostatic pressing flexible mold port compression sealing tool, characterized in that: It comprises an arc-shaped pressing plate (1), a steel wire rope (2), a movable block (4) and a bolt (5); The arc-shaped pressing plate (1) is provided with grooves from both ends to the middle for the steel wire rope (2) to pass through; The outer side of the arc-shaped pressing plate (1) is fixedly connected to a fixed block (3), and the bolts (5) are passed through the fixed block (3) and the movable block (4) in sequence and then covered with nuts (6); the two ends of the steel wire rope (2) pass through the grooves from the inner side of the arc-shaped pressing plate (1) and are respectively fixedly connected to the fixed block (3) and the movable block (4); The movable block (4) can move outside the arc-shaped pressing plate (1) under the cooperation of the bolt (5) and the nut (6), thereby driving the steel wire rope (2) and the arc-shaped pressing plate (1) to be compressed and sealed or loosened.

2. The cold isostatic pressing flexible mold port compression sealing tool according to claim 1, characterized in that: The arc-shaped pressing plate (1) has a thickness of 3 to 5 mm, a width of 20 to 30 mm, an arc length of 1 / 4 to 1 / 5 of the circumference of the flexible mold port, and a corresponding circumferential diameter of 0.9 to 1.2 times the minimum outer diameter of the flexible mold port when compressed and shrunk under isostatic pressure.

3. The cold isostatic pressing flexible mold port compression sealing tool according to claim 1, characterized in that: The steel wire rope (2) is one or more wire ropes; The diameter of a single steel wire rope (2) is 3 to 10 mm, and the minimum breaking force of a single steel wire rope is ≥ 10 kN.

4. The cold isostatic pressing flexible mold port compression sealing tool according to claim 1, characterized in that: The arc-shaped pressing plate (1) is a metal plate; The fixed block (3) and / or the movable block (4) are metal blocks.

5. The cold isostatic pressing flexible mold port compression sealing tool according to claim 1, characterized in that: The nut (6) is fixedly connected to the movable block (4).

6. The cold isostatic pressing flexible mold port compression sealing tool according to claim 1, characterized in that: The length of the groove satisfies the following conditions: there is no gap between the interfaces of the steel wire rope (2), the arc-shaped pressing plate (1) and the flexible mold port, and the steel wire rope (2) will not be tangentially restrained by the arc-shaped pressing plate (1).

7. The cold isostatic pressing flexible mold port compression sealing tool according to claim 1, characterized in that: The fixed block (3) and the movable block (4) are provided with slotted holes, and the bolts (5) pass through the slotted holes and can adjust the tilting angle within the limited space of the slotted holes.

8. The cold isostatic pressing flexible mold port compression sealing tool according to claim 1, characterized in that: The two ends of the steel wire rope (2) are welded to the fixed block (3) and the movable block (4) in a perforated manner.

9. The cold isostatic pressing flexible mold port compression sealing tool according to claim 1, characterized in that: Gaskets (7) are provided on the opposite sides of the fixed block (3) and the movable block (4).

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