Self-sealing die for isostatic pressing

Abstract

The utility model belongs to the technical field of explosive column pressing, and particularly relates to a self-sealing die for isostatic pressing. According to the technical scheme, the self-sealing die for isostatic pressing comprises a die sleeve, a medicine powder cavity is formed in the die sleeve, medicine powder particles are contained in the medicine powder cavity, punches are arranged in the two ends of the die sleeve, a high-pressure check ring and a Y-shaped sealing ring are arranged between the punches and the die sleeve, and the Y-shaped sealing ring is located on the side, away from the medicine powder cavity, of the high-pressure check ring. And one end of the Y-shaped sealing ring is exposed in a space, communicated with the outside, of the die sleeve. The utility model provides a self-sealing die for isostatic pressing.

Description

Technical Field

[0001] The utility model belongs to the technical field of explosive column pressing, in particular to a self-sealing mould for isostatic pressing. Background Art

[0002] Due to the unique nature of the raw materials, traditional explosives are pressed using die-cut dies, resulting in low production efficiency and limited production of single shots at a time. The die is bulky and heavy due to the application of force from both ends. Furthermore, the coaxiality and parallelism of the upper and lower dies can lead to uneven pressing forces and unstable product quality. The isostatic pressing process for explosives allows for the production of multiple shots at a time, while also providing balanced pressing forces, stable quality, and a lightweight die.

[0003] However, it has always been difficult to achieve safe and reliable high-pressure sealing when isostatic pressing is used to press explosive products, which has long hindered the application of isostatic pressing technology in the field of explosives. Utility Model Content

[0004] In order to solve the above problems existing in the prior art, the purpose of the present invention is to provide a self-sealing mold for isostatic pressing.

[0005] The technical solution adopted by this utility model is:

[0006] A self-sealing mold for isostatic pressing comprises a mold sleeve, the interior of the mold sleeve is a medicine powder cavity, the medicine powder cavity is filled with medicine powder particles, punches are provided at both ends of the mold sleeve, a high-pressure retaining ring and a Y-shaped sealing ring are provided between the punch and the mold sleeve, the Y-shaped sealing ring is located on the side of the high-pressure retaining ring away from the medicine powder cavity, and one end of the Y-shaped sealing ring is exposed in the space connecting the mold sleeve and the outside world.

[0007] When the product is pressed, the powder particles are encapsulated in the die sleeve through the upper and lower punches, and then the whole is immersed in high-pressure liquid. By continuously increasing the liquid pressure, the punch assembly is pushed to press the powder into shape.

[0008] The hydraulic seal of the punch adopts a double sealing method of high-pressure retaining ring and Y-type sealing ring.

[0009] The outermost seal of the punch uses a Y-shaped sealing ring. During operation, the Y-shaped sealing ring is not only pushed downward by the liquid, but also presses inward and outward from the liquid in the Y-shaped groove. These two forces make the Y-shaped sealing ring tightly adhere to the inner wall sealing surface of the die sleeve and the outer circle sealing surface of the punch. The greater the liquid pressure, the tighter the sealing surface fits, achieving a high-pressure seal.

[0010] There is a high-pressure retaining ring under the Y-shaped sealing ring of the punch. During operation, the downward thrust of the liquid on the Y-shaped sealing ring directly acts on the high-pressure retaining ring, causing it to be squeezed and deformed, expanding inward and outward. The deformation in these two directions makes the high-pressure retaining ring tightly fit the sealing surface of the inner wall of the die sleeve and the outer sealing surface of the punch. The greater the liquid pressure, the greater the deformation, and the tighter the sealing surface fits, achieving ultra-high-pressure sealing.

[0011] The utility model adopts a dual sealing method of high-pressure retaining ring and Y-shaped sealing ring to achieve reliable high-pressure sealing. When isostatic pressing is used to press explosive products, the high-pressure retaining ring and Y-shaped sealing ring achieve safe and reliable high-pressure sealing, thereby realizing the application of isostatic pressing technology in the field of explosives.

[0012] As a preferred solution of the present invention, the material of the Y-shaped sealing ring is polyurethane. The outermost sealing layer of the punch adopts a Y-shaped sealing ring made of polyurethane.

[0013] As a preferred embodiment of the present invention, the Y-shaped sealing ring is pushed downward by the liquid, while the Y-shaped groove of the Y-shaped sealing ring is pressed inward and outward by the liquid. During operation, the Y-shaped sealing ring is not only pushed downward by the liquid, but also presses inward and outward on the Y-shaped sealing ring in the Y-shaped groove. These two forces cause the Y-shaped sealing ring to tightly adhere to the sealing surface of the inner wall of the die sleeve and the outer sealing surface of the punch. The greater the liquid pressure, the tighter the sealing surface fits, achieving a high-pressure seal.

[0014] As a preferred solution of the present invention, the material of the high-pressure retaining ring is polytetrafluoroethylene. A high-pressure retaining ring is arranged under the Y-shaped sealing ring of the punch and is made of polytetrafluoroethylene.

[0015] As a preferred embodiment of the present invention, the high-pressure retaining ring is subjected to inward and outward expansion forces under the pressure of the Y-shaped sealing ring. During operation, the downward thrust of the liquid applied to the Y-shaped sealing ring directly acts on the high-pressure retaining ring, causing it to deform and expand inward and outward. This deformation in these two directions causes the high-pressure retaining ring to tightly adhere to the sealing surface of the inner wall of the die sleeve and the outer cylindrical sealing surface of the punch. The greater the liquid pressure, the greater the deformation, and the tighter the sealing surface fits, achieving ultra-high-pressure sealing.

[0016] As a preferred solution of the present invention, a sealing ring cover is connected to the end surface of the punch away from the powder chamber. The sealing ring cover can limit the position of the Y-shaped sealing ring.

[0017] As a preferred solution of the present invention, the sealing ring cover plate and the punch are connected by a plurality of bolts, which ensures a reliable connection and convenient disassembly and assembly.

[0018] As a preferred solution of the present invention, the edge of the sealing ring cover extends to a partial area corresponding to the Y-shaped sealing ring.

[0019] As a preferred solution of the present invention, a gap is left between the Y-shaped sealing ring and the sealing ring cover to prevent the sealing ring retaining ring from blocking the oil from entering the Y-shaped groove of the Y-shaped sealing ring, thereby ensuring that the oil evenly compresses the Y-shaped sealing ring.

[0020] As a preferred solution of the present invention, a mounting step groove is provided on the circumferential surface of a section of the punch away from the powder chamber, and the opening of the mounting step groove is toward the side of the punch away from the powder chamber. The high-pressure retaining ring and the Y-type sealing ring are respectively installed on the mounting step groove, thereby ensuring the stable position of the high-pressure retaining ring and the Y-type sealing ring.

[0021] The beneficial effects of the utility model are:

[0022] The utility model adopts a dual sealing method of high-pressure retaining ring and Y-shaped sealing ring to achieve reliable high-pressure sealing. When isostatic pressing is used to press explosive products, the high-pressure retaining ring and Y-shaped sealing ring achieve safe and reliable high-pressure sealing, thereby realizing the application of isostatic pressing technology in the field of explosives. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a cross-sectional view of the utility model;

[0024] Figure 2 It is a top view of the utility model;

[0025] Figure 3 It is a cross-sectional view of the punch;

[0026] Figure 4 yes Figure 3 A partial enlarged view of point A in the middle;

[0027] Figure 5 It is a top view of the punch.

[0028] In the figure: 1-die sleeve; 2-powder particles; 3-punch; 4-high-pressure retaining ring; 5-Y-type sealing ring; 6-sealing ring cover; 31-mounting step groove. DETAILED DESCRIPTION

[0029] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without inventive effort are within the scope of protection of the present invention. It should be noted that the embodiments of the present invention and the features therein may be combined with each other unless there is a conflict.

[0031] like Figures 1 to 5 As shown, the self-sealing mold for isostatic pressing in this embodiment includes a mold sleeve 1, the interior of the mold sleeve 1 is a powder cavity, the powder cavity is filled with powder particles 2, punches 3 are provided at both ends of the mold sleeve 1, and a high-pressure retaining ring 4 and a Y-shaped sealing ring 5 are provided between the punch 3 and the mold sleeve 1. The Y-shaped sealing ring 5 is located on the side of the high-pressure retaining ring 4 away from the powder cavity, and one end of the Y-shaped sealing ring 5 is exposed in the space connecting the mold sleeve 1 with the outside world.

[0032] When the product is pressed, the powder particles 2 are encapsulated in the die sleeve 1 through the upper and lower punches 3, and then the whole is immersed in high-pressure liquid. By continuously increasing the liquid pressure, the punch 3 assembly is pushed to press the powder into shape.

[0033] The hydraulic seal of the punch 3 adopts a double sealing method of a high-pressure retaining ring 4 and a Y-shaped sealing ring 5.

[0034] The outermost seal of the punch 3 uses a Y-shaped sealing ring 5. During operation, the Y-shaped sealing ring 5 is not only pushed downward by the liquid, but also presses inward and outward from the liquid in the Y-shaped groove. These two forces make the Y-shaped sealing ring 5 tightly adhere to the inner wall sealing surface of the die sleeve 1 and the outer circle sealing surface of the punch 3. The greater the liquid pressure, the tighter the sealing surface fits, achieving high-pressure sealing. Figure 4 As shown, P1, P2, and P3 are the stress conditions of the Y-shaped sealing ring 5.

[0035] There is a high-pressure retaining ring 4 under the Y-shaped sealing ring 5 of the punch 3. During operation, the downward thrust of the liquid on the Y-shaped sealing ring 5 directly acts on the high-pressure retaining ring 4, causing the high-pressure retaining ring 4 to be squeezed and deformed, expanding inward and outward. The deformation in these two directions makes the high-pressure retaining ring 4 tightly fit against the inner wall sealing surface of the die sleeve 1 and the outer circle sealing surface of the punch 3. The greater the liquid pressure, the greater the deformation, and the tighter the sealing surface fits, thus achieving ultra-high pressure sealing. Figure 4 As shown, P is the extrusion force of the Y-shaped sealing ring on the high-pressure retaining ring 4, and δ is the inward and outward expansion force of the high-pressure retaining ring 4.

[0036] The utility model adopts a double sealing method of high-pressure retaining ring 4 and Y-shaped sealing ring 5 to achieve reliable high-pressure sealing. When isostatic pressing is used to press explosive products, the high-pressure retaining ring 4 and Y-shaped sealing ring 5 achieve safe and reliable high-pressure sealing, thereby realizing the application of isostatic pressing technology in the field of explosives.

[0037] The material of the Y-shaped sealing ring 5 is polyurethane. The outermost sealing layer of the punch 3 adopts a Y-shaped sealing ring 5 made of polyurethane.

[0038] The Y-shaped sealing ring 5 is pushed downward by the liquid, while the Y-shaped groove of the Y-shaped sealing ring 5 is pressed inward and outward by the liquid. During operation, the Y-shaped sealing ring 5 is not only pushed downward by the liquid, but also presses inward and outward on the Y-shaped sealing ring 5 in the Y-shaped groove. These two forces make the Y-shaped sealing ring 5 tightly adhere to the inner wall sealing surface of the die sleeve 1 and the outer cylindrical sealing surface of the punch 3. The greater the liquid pressure, the tighter the sealing surface fits, achieving a high-pressure seal.

[0039] Wherein, the material of described high pressure retaining ring 4 is polytetrafluoroethylene. High pressure retaining ring 4 is arranged under the Y-shaped sealing ring 5 of punch 3, and is made of polytetrafluoroethylene.

[0040] The high-pressure retaining ring 4 is subjected to inward and outward expansion forces under the pressure of the Y-shaped sealing ring 5. During operation, the downward thrust of the liquid on the Y-shaped sealing ring 5 directly acts on the high-pressure retaining ring 4, causing it to be squeezed and deformed, expanding inward and outward. The deformation in these two directions makes the high-pressure retaining ring 4 tightly adhere to the inner wall sealing surface of the die sleeve 1 and the outer cylindrical sealing surface of the punch 3. The greater the liquid pressure, the greater the deformation, and the tighter the sealing surface fits, achieving ultra-high-pressure sealing.

[0041] Furthermore, a sealing ring cover plate 6 is connected to the end surface of the punch 3 away from the powder chamber. The sealing ring cover plate 6 can limit the Y-shaped sealing ring 5.

[0042] The sealing ring cover plate 6 is connected to the punch 3 by a plurality of bolts, which ensures a reliable connection and is convenient for assembly and disassembly.

[0043] The edge of the sealing ring cover extends to a portion of the area corresponding to the Y-shaped sealing ring 5 .

[0044] A gap is left between the Y-shaped sealing ring 5 and the sealing ring cover plate to prevent the sealing ring retaining ring from blocking the oil from entering the Y-shaped groove of the Y-shaped sealing ring 5, thereby ensuring that the oil evenly compresses the Y-shaped sealing ring 5.

[0045] In order to facilitate the installation of the high-pressure retaining ring 4 and the Y-type sealing ring 5, an installation step groove 31 is provided on the circumferential surface of the punch 3 away from the powder chamber. The opening of the installation step groove 31 is facing the side of the punch 3 away from the powder chamber. The high-pressure retaining ring 4 and the Y-type sealing ring 5 are respectively installed on the installation step groove 31, thereby ensuring the stable position of the high-pressure retaining ring 4 and the Y-type sealing ring 5.

[0046] The present invention is not limited to the above-mentioned optional implementation methods. Anyone can derive various other forms of products under the inspiration of the present invention. However, no matter what changes are made in the shape or structure, any technical solution that falls within the scope defined by the claims of the present invention shall fall within the scope of protection of the present invention.

Claims

1. A self-sealing mold for isostatic pressing, characterized in that: The invention comprises a die sleeve (1), wherein the interior of the die sleeve (1) is a medicine powder cavity, and medicine powder particles (2) are contained in the medicine powder cavity. Punches (3) are provided at both ends of the die sleeve (1), and a high-pressure retaining ring (4) and a Y-shaped sealing ring (5) are provided between the punch (3) and the die sleeve (1). The Y-shaped sealing ring (5) is located on a side of the high-pressure retaining ring (4) away from the medicine powder cavity, and one end of the Y-shaped sealing ring (5) is exposed in a space connecting the die sleeve (1) and the outside world.

2. The self-sealing mold for isostatic pressing according to claim 1, characterized in that: The material of the Y-shaped sealing ring (5) is polyurethane material.

3. The self-sealing mold for isostatic pressing according to claim 1, characterized in that: The Y-shaped sealing ring (5) is pushed downward by the liquid, and the Y-shaped groove of the Y-shaped sealing ring (5) is pressed inward and outward by the liquid.

4. The self-sealing mold for isostatic pressing according to claim 1, characterized in that: The material of the high-pressure retaining ring (4) is polytetrafluoroethylene.

5. The self-sealing mold for isostatic pressing according to claim 1, characterized in that: The high-pressure retaining ring (4) is subjected to inward and outward expansion forces under the extrusion of the Y-shaped sealing ring (5).

6. The self-sealing mold for isostatic pressing according to claim 1, characterized in that: A sealing ring cover plate (6) is connected to the end surface of the punch (3) away from the powder chamber.

7. The self-sealing mold for isostatic pressing according to claim 6, characterized in that: The sealing ring cover plate (6) is connected to the punch (3) via a plurality of bolts.

8. The self-sealing mold for isostatic pressing according to claim 6, characterized in that: The edge of the sealing ring cover plate extends to a portion of the area corresponding to the Y-shaped sealing ring (5).

9. The self-sealing mold for isostatic pressing according to claim 8, characterized in that: A gap is left between the Y-shaped sealing ring (5) and the sealing ring baffle.

10. The self-sealing mold for isostatic pressing according to any one of claims 1 to 9, characterized in that: A mounting step groove (31) is provided on the circumferential surface of a section of the punch (3) away from the powder chamber, the opening of the mounting step groove (31) faces the side of the punch (3) away from the powder chamber, and the high-pressure retaining ring (4) and the Y-shaped sealing ring (5) are respectively mounted on the mounting step groove (31).

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