Isostatic pressing mold vacuuming system and method

Abstract

The present invention belongs to the technical field of explosive column pressing production, and particularly relates to an isostatic pressing mold vacuuming system and method. The technical scheme is: an isostatic pressing mold vacuuming system, including a vacuum chamber, a vacuum control mechanism is connected to the vacuum chamber, a mold sleeve is arranged in the vacuum chamber, the lower part of the mold sleeve is connected to the lower mold head, explosive powder is filled in the mold sleeve, a handle is arranged on the upper sleeve of the vacuum chamber, and the end of the handle extending into the vacuum chamber is connected to the upper mold head, and the upper mold head is inserted into the mold sleeve from the upper opening of the mold sleeve. The present invention provides an isostatic pressing mold vacuuming system and method.

Description

Technical Field

[0001] The invention belongs to the technical field of explosive column pressing production, and particularly relates to an isostatic pressing die vacuuming system and method. Background Art

[0002] Due to the particularity of the raw materials, traditional explosives are pressed with a hydraulic press and a die, which has low production efficiency and can only be pressed one shot at a time; the hydraulic press is used to apply force up and down during pressing, resulting in a large volume and weight of the mold; at the same time, it is subject to the influence of the coaxiality and parallelism of the upper and lower molds, and the low control accuracy of large hydraulic presses, which may result in uneven pressing force and unstable product quality. The use of isostatic pressing technology to press explosives can achieve multiple production at one time, and the product is pressed in all directions, making the force balanced, the quality stable, and the mold light.

[0003] Before the isostatic pressing process is used to press the explosive column, the explosive powder needs to be loaded into a mold and the column is formed by vacuuming. There is no vacuuming process for forming the column in the prior art. Summary of the invention

[0004] In order to solve the above problems existing in the prior art, the object of the present invention is to provide an isostatic pressing mold vacuum pumping system and method.

[0005] The technical solution adopted by the present invention is:

[0006] An isostatic pressing mold vacuum pumping system comprises a vacuum chamber, a vacuum control mechanism is connected to the vacuum chamber, a mold sleeve is arranged in the vacuum chamber, a lower mold head is connected to the lower part of the mold sleeve, explosive powder is contained in the mold sleeve, a handle is arranged on the upper sleeve of the vacuum chamber, one end of the handle extending into the vacuum chamber is connected to the upper mold head, and the upper mold head is inserted into the mold sleeve from the upper opening of the mold sleeve.

[0007] After closing the vacuum chamber cover, lift the handle to start vacuuming the vacuum chamber. After the vacuum degree reaches the requirement, press the handle, insert the upper end cap of the mold into the mold sleeve, and complete the vacuuming. In the present invention, the powder column is formed by vacuuming, and the upper end cap of the mold and the lower end cap of the mold respectively seal the two sides of the powder column to ensure the vacuum state of the powder column, which is convenient for the subsequent isostatic pressing process to press the explosive powder column.

[0008] As a preferred solution of the present invention, the bottom of the mold sleeve is connected with a connecting plate by bolts, the mold lower head is sleeved in the mold sleeve, and the connecting plate and the mold lower head are connected by bolts. In the demolding stage, the bolts between the bottom of the mold sleeve and the connecting plate and between the connecting plate and the mold lower head are removed respectively to remove the mold lower head for easy demolding.

[0009] As a preferred solution of the present invention, a supporting step is arranged on the circumferential surface of the upper head of the mold, a high-pressure retaining ring is arranged on the supporting step, a Y-shaped sealing ring is arranged on the upper side of the high-pressure retaining ring, and both the high-pressure retaining ring and the Y-shaped sealing ring are arranged between the upper head of the mold and the mold sleeve.

[0010] The Y-shaped sealing ring is made of polyurethane material. When the isostatic pressing process is used to suppress the explosive column, the Y-shaped sealing ring is not only pushed downward by the liquid, but also pressed inward and outward by the liquid in the Y-shaped groove. These two forces make the sealing ring tightly fit the inner wall sealing surface of the mold sleeve and the outer circle sealing surface of the upper head of the mold. The greater the liquid pressure, the tighter the sealing surface fits, achieving high-pressure sealing.

[0011] A high-pressure retaining ring is set under the Y-shaped sealing ring, which is made of polytetrafluoroethylene. When the explosive column is pressed by isostatic pressing, the Y-shaped sealing ring is subjected to the downward thrust of the liquid, which directly acts on the high-pressure retaining ring, causing the high-pressure retaining ring to be squeezed and deformed, expanding inward and outward. The deformation in these two directions makes the retaining ring tightly fit the sealing surface of the inner wall of the mold sleeve and the outer cylindrical sealing surface of the upper head of the mold. The greater the liquid pressure, the greater the deformation, and the tighter the sealing surface fits, achieving ultra-high pressure sealing.

[0012] Similarly, the same high-pressure retaining ring and Y-shaped sealing ring are also arranged on the lower head of the mold.

[0013] As a preferred embodiment of the present invention, the vacuum chamber includes a vacuum chamber cylinder, the lower part of which is connected to a base, the upper part of which is connected to a vacuum chamber cover, the vacuum control mechanism is installed on the vacuum chamber cover, and the handle is sleeved on the vacuum chamber cover.

[0014] As a preferred solution of the present invention, a vacuum chamber lower sealing ring is provided between the vacuum chamber cylinder and the base, and a vacuum chamber upper sealing ring is provided between the vacuum chamber cylinder and the vacuum chamber upper cover. By providing the vacuum chamber lower sealing ring and the vacuum chamber upper sealing ring, a good sealing environment of the vacuum chamber can be ensured.

[0015] As a preferred solution of the present invention, the base is connected to a mold support, a limiting groove is provided on the mold support, and the bottom of the mold sleeve is placed in the limiting groove of the mold support. The limiting groove of the mold support limits the mold sleeve to ensure that when the handle is pressed down after the vacuum degree reaches the requirement, the mold upper head can be accurately inserted into the mold sleeve.

[0016] As a preferred solution of the present invention, the vacuum chamber upper cover is equipped with a handle guide sleeve, the handle sleeve is arranged in the handle guide sleeve, and a handle sealing ring is arranged between the handle guide sleeve and the handle. The handle sealing ring can reliably seal the gap between the handle and the handle guide sleeve to ensure the sealed environment of the vacuum chamber.

[0017] As a preferred solution of the present invention, the material of the vacuum chamber cover is a transparent material. The vacuum chamber cover is made of a transparent material, and the state and position of the mold inside the vacuum chamber can be clearly seen during operation.

[0018] As a preferred embodiment of the present invention, the vacuum control mechanism includes a connector connected to an upper cover of the vacuum chamber, and an air extraction valve, a pressure relief valve and a vacuum pressure gauge are respectively connected to the connector.

[0019] A method for vacuuming an isostatic pressing mold comprises the following steps:

[0020] S1: Assemble the lower head of the mold and the mold sleeve, put explosive powder into the mold sleeve, place the mold sleeve in the mold support on the vacuum chamber base, and place the vacuum chamber cylinder on the base;

[0021] S2: Connect the upper head of the mold to the handle, cover the upper cover of the vacuum chamber, lift the handle, and start vacuuming;

[0022] S3: After the vacuum degree reaches the requirement, press down the handle and insert the upper head of the mold into the mold sleeve to complete the vacuuming.

[0023] The beneficial effects of the present invention are:

[0024] The vacuum control mechanism of the present invention can evacuate the vacuum chamber, and the powder column is formed by evacuating the vacuum. The upper head of the mold and the lower head of the mold respectively seal the two sides of the powder column to ensure the vacuum state of the powder column, which is convenient for the subsequent use of the isostatic pressing process to suppress the explosive powder column. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a cross-sectional view of the present invention;

[0026] Figure 2 yes Figure 1 A partial enlarged view of the middle A;

[0027] Figure 3 It is a partial structural diagram of the present invention;

[0028] Figure 4 It is a front view of the present invention;

[0029] Figure 5 It is a left side view of the present invention;

[0030] Figure 6 It is a top view of the present invention.

[0031] In the figure: 1-vacuum chamber; 2-vacuum control mechanism; 3-mold sleeve; 4-mold lower head; 5-explosive powder; 6-handle; 7-mold upper head; 8-mold support; 9-handle guide sleeve; 11-vacuum chamber cylinder; 12-base; 13-vacuum chamber upper cover; 14-vacuum chamber lower sealing ring; 15-vacuum chamber upper sealing ring; 21-connector; 22-exhaust valve; 23-pressure relief valve; 24-vacuum pressure gauge; 41-connecting plate; 71-high-pressure retaining ring; 72-Y-type sealing ring; 91-handle sealing ring. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0033] 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 merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0034] like Figure 1 to Figure 6 As shown, the isostatic mold vacuum system of this embodiment includes a vacuum chamber 1, a vacuum control mechanism 2 is connected to the vacuum chamber 1, a mold sleeve 3 is arranged in the vacuum chamber 1, a mold lower head 4 is connected to the lower part of the mold sleeve 3, explosive powder 5 is filled in the mold sleeve 3, a handle 6 is provided on the vacuum chamber 1, and one end of the handle 6 extending into the vacuum chamber 1 is connected to the mold upper head 7, and the mold upper head 7 is inserted into the mold sleeve 3 from the upper opening of the mold sleeve 3.

[0035] After the vacuum chamber upper cover 13 is covered, the handle 6 is lifted to start vacuuming the vacuum chamber 1. After the vacuum degree reaches the requirement, the handle 6 is pressed down, and the upper die head 7 is inserted into the die sleeve 3 to complete the vacuuming. In the present invention, the powder column is formed by vacuuming, and the upper die head 7 and the lower die head 4 of the mold respectively seal the two sides of the powder column to ensure the vacuum state of the powder column, which is convenient for the subsequent isostatic pressing process to press the explosive powder column.

[0036] The bottom of the mold sleeve 3 is connected with a connecting plate 41 by bolts, the mold lower head 4 is sleeved in the mold sleeve 3, and the connecting plate 41 is connected to the mold lower head 4 by bolts. In the demolding stage, the bolts between the bottom of the mold sleeve 3 and the connecting plate 41 and between the connecting plate 41 and the mold lower head 4 are removed respectively to remove the mold lower head 4 for easy demolding.

[0037] In order to ensure that the medicine column is reliably sealed, a supporting step is provided on the circumferential surface of the upper head 7 of the mold, a high-pressure retaining ring 71 is provided on the supporting step, a Y-shaped sealing ring 72 is provided on the upper side of the high-pressure retaining ring 71, and the high-pressure retaining ring 71 and the Y-shaped sealing ring 72 are both provided between the upper head 7 of the mold and the mold sleeve 3.

[0038] The Y-shaped sealing ring 72 is made of polyurethane material. When the explosive column is pressed by isostatic pressing, the Y-shaped sealing ring 72 is not only pushed downward by the liquid, but also pressed inward and outward by the liquid in the Y-shaped groove. These two forces make the sealing ring tightly fit the inner wall sealing surface of the mold sleeve 3 and the outer circle sealing surface of the mold upper head 7. The greater the liquid pressure, the tighter the sealing surface fits, achieving high-pressure sealing.

[0039] A high-pressure retaining ring 71 is arranged under the Y-shaped sealing ring 72 and is made of polytetrafluoroethylene. When the explosive column is pressed by isostatic pressing, the Y-shaped sealing ring 72 is subjected to the downward thrust of the liquid, which directly acts on the high-pressure retaining ring 71, so that the high-pressure retaining ring 71 is squeezed and deformed, and expands inward and outward. The deformation in these two directions makes the retaining ring closely fit the inner wall sealing surface of the mold sleeve 3 and the outer circle sealing surface of the upper head 7 of the mold. The greater the liquid pressure, the greater the deformation, and the tighter the sealing surface fits, so as to achieve ultra-high pressure sealing.

[0040] Similarly, the same high-pressure retaining ring 71 and Y-shaped sealing ring 72 are also provided on the lower head 4 of the mold.

[0041] Specifically, the vacuum chamber 1 includes a vacuum chamber cylinder 11, the lower part of the vacuum chamber cylinder 11 is connected to a base 12, the upper part of the vacuum chamber cylinder 11 is connected to a vacuum chamber upper cover 13, the vacuum control mechanism 2 is installed on the vacuum chamber upper cover 13, and the handle 6 is sleeved on the vacuum chamber upper cover 13.

[0042] To ensure the airtightness of the vacuum chamber 1, a vacuum chamber lower sealing ring 14 is provided between the vacuum chamber cylinder 11 and the base 12, and a vacuum chamber upper sealing ring 15 is provided between the vacuum chamber cylinder 11 and the vacuum chamber upper cover 13. By providing the vacuum chamber lower sealing ring 14 and the vacuum chamber upper sealing ring 15, a good sealing environment of the vacuum chamber 1 can be ensured.

[0043] In order to accurately position the mold sleeve 3, the base 12 is connected to a mold support 8, and a limiting groove is provided on the mold support 8. The bottom of the mold sleeve 3 is placed in the limiting groove of the mold support 8. The limiting groove of the mold support 8 limits the mold sleeve 3, ensuring that when the handle 6 is pressed down after the vacuum degree reaches the requirement, the mold upper head 7 can be accurately inserted into the mold sleeve 3.

[0044] Furthermore, the vacuum chamber upper cover 13 is provided with a handle guide sleeve 9, and the handle 6 is sleeved in the handle guide sleeve 9; a handle sealing ring 91 is provided between the handle guide sleeve 9 and the handle 6. The handle sealing ring 91 can reliably seal the gap between the handle 6 and the handle guide sleeve 9 to ensure the sealed environment of the vacuum chamber 1.

[0045] The vacuum chamber cover 13 is made of a transparent material, so that the state and position of the mold inside the vacuum chamber 1 can be clearly seen during operation.

[0046] Specifically, the vacuum control mechanism 2 includes a connector 21 connected to the upper cover 13 of the vacuum chamber, and the connector 21 is respectively connected to an air extraction valve 22, a pressure relief valve 23 and a vacuum pressure gauge 24.

[0047] The isostatic pressing mold vacuuming method of this embodiment comprises the following steps:

[0048] S1: Assemble the mold lower head 4 and the mold sleeve 3, load the explosive powder 5 into the mold sleeve 3, place the mold sleeve 3 in the mold support 8 on the base 12 of the vacuum chamber 1, and place the vacuum chamber cylinder 11 on the base 12;

[0049] S2: Connect the mold upper head 7 to the handle 6, cover the vacuum chamber upper cover 13, lift the handle 6, and start vacuuming;

[0050] S3: After the vacuum degree reaches the requirement, the handle 6 is pressed down, and the mold upper head 7 is inserted into the mold sleeve 3 to complete the vacuuming.

[0051] The present invention is not limited to the above-mentioned optional implementation modes. Anyone can derive other various forms of products under the inspiration of the present invention. However, no matter what changes are made in the shape or structure, all technical solutions that fall within the scope defined by the claims of the present invention fall within the protection scope of the present invention.

Claims

1. An isostatic pressing mold vacuum system, characterized in that: The invention comprises a vacuum chamber (1), the vacuum chamber (1) is connected to a vacuum control mechanism (2), a mold sleeve (3) is arranged in the vacuum chamber (1), the lower part of the mold sleeve (3) is connected to a mold lower head (4), explosive powder (5) is contained in the mold sleeve (3), a handle (6) is arranged on the upper sleeve of the vacuum chamber (1), one end of the handle (6) extending into the vacuum chamber (1) is connected to a mold upper head (7), and the mold upper head (7) is inserted into the mold sleeve (3) from the upper opening of the mold sleeve (3).

2. The isostatic pressing mold vacuum system according to claim 1, characterized in that: The bottom of the mold sleeve (3) is connected to a connecting plate (41) via bolts, the mold lower head (4) is sleeved in the mold sleeve (3), and the connecting plate (41) and the mold lower head (4) are connected via bolts.

3. The isostatic pressing mold vacuum system according to claim 1, characterized in that: A supporting step is arranged on the circumferential surface of the mold upper end cap (7), a high-pressure retaining ring (71) is arranged on the supporting step, a Y-shaped sealing ring (72) is arranged on the upper side of the high-pressure retaining ring (71), and both the high-pressure retaining ring (71) and the Y-shaped sealing ring (72) are arranged between the mold upper end cap (7) and the mold sleeve (3).

4. The isostatic pressing mold vacuum system according to claim 1, characterized in that: The vacuum chamber (1) comprises a vacuum chamber cylinder (11), the lower part of the vacuum chamber cylinder (11) is connected to a base (12), the upper part of the vacuum chamber cylinder (11) is connected to a vacuum chamber upper cover (13), the vacuum control mechanism (2) is mounted on the vacuum chamber upper cover (13), and the handle (6) is sleeved on the vacuum chamber upper cover (13).

5. The isostatic pressing mold vacuum system according to claim 4, characterized in that: A vacuum bin lower sealing ring (14) is provided between the vacuum bin cylinder (11) and the base (12), and a vacuum bin upper sealing ring (15) is provided between the vacuum bin cylinder (11) and the vacuum bin upper cover (13).

6. The isostatic pressing mold vacuum system according to claim 4, characterized in that: The base (12) is connected to a mold support (8), the mold support (8) is provided with a limiting groove, and the bottom of the mold sleeve (3) is placed in the limiting groove of the mold support (8).

7. The isostatic pressing mold vacuum system according to claim 4, characterized in that: The vacuum chamber upper cover (13) is provided with a handle guide sleeve (9), and the handle (6) is sleeved in the handle guide sleeve (9); a handle sealing ring (91) is provided between the handle guide sleeve (9) and the handle (6).

8. The isostatic pressing mold vacuum system according to claim 4, characterized in that: The material of the vacuum chamber upper cover (13) is a transparent material.

9. The isostatic pressing mold vacuum system according to claim 4, characterized in that: The vacuum control mechanism (2) comprises a connector (21) connected to the upper cover (13) of the vacuum chamber, and the connector (21) is respectively connected to an air extraction valve (22), a pressure relief valve (23) and a vacuum pressure gauge (24).

10. A method for evacuating an isostatic pressing mold, using the isostatic pressing mold evacuation system according to claim 4, characterized in that: The following steps are involved: S1: Assemble the mold lower head (4) and the mold sleeve (3), put explosive powder (5) into the mold sleeve (3), place the mold sleeve (3) into the mold support (8) on the base (12) of the vacuum chamber (1), and place the vacuum chamber cylinder (11) on the base (12); S2: Connect the mold upper head (7) to the handle (6), cover the vacuum chamber upper cover (13), lift the handle (6), and start vacuuming; S3: After the vacuum degree reaches the required level, the handle (6) is pressed down, and the upper mold head (7) is inserted into the mold sleeve (3) to complete the vacuuming.

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