Special-shaped sheet grain pressing mold and forming method

Abstract

The invention discloses a special-shaped slice grain pressing mold and a forming method, and aims at solving the technical problem that a special-shaped slice grain is difficult to form from the technical problems existing in the forming process of the special-shaped grain. And the mould pressing process is changed into secondary pressing from primary forming. Powder is firstly pressed for the first time until the upper end face of a punch is flush with the upper end face of a die cylinder; and then, the cushion block and the gasket are pulled out, pressurization is conducted again till the set pressure is reached, and pressure maintaining and demolding are conducted. The special-shaped slice grain pressed by the special-shaped slice grain pressing mold is complete in structure, free of cracks and even ring falling, good in physical size consistency, qualified in appearance and free of defects, the process problem of compression molding of the special-shaped slice grain can be solved, the process is safe and reliable, and the product quality is qualified.

Description

Technical Field

[0001] The invention belongs to the field of explosive molding, and particularly relates to a special-shaped thin-sheet explosive column pressing mold and a molding method. Background Art

[0002] The compression molding process is to pressurize the explosive powder into a certain shape of charge, which can produce a high-density charge. However, the compression molding process is difficult for special-shaped charge, and it is easy to cause stress concentration, resulting in cracks and fractures in the charge. Cracks and fractures in the charge have a serious impact on the safety and product quality of explosive charges and ammunition.

[0003] Generally, the preparation of special-shaped grains usually adopts the method of pressing and splicing them in blocks, or pressing them into ordinary grains, and then forming special-shaped structures through mechanical processing. Whether it is grain splicing or mechanical processing, it not only makes the process complicated and increases the preparation cost, but also adds a dangerous process, especially the mechanical processing method, which is not the best solution.

[0004] In general, in the prior art, due to the defects in the existing preparation process and preparation mold, the special-shaped grains are difficult to form and are prone to falling off and cracking after forming. Summary of the invention

[0005] The object of the present invention is to provide a special-shaped thin-sheet medicine column pressing mold and a molding method to solve the problems in the prior art of difficulty in molding special-shaped medicine columns and easy falling off and cracking of the molded special-shaped medicine columns.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions to achieve the above problems:

[0007] A special-shaped thin-sheet medicine column pressing die comprises a base, a die barrel and a punch; the base comprises a connecting part and a supporting part, the connecting part is a cylindrical structure, and the supporting part is an annular structure fixedly connected to the bottom of the connecting part; the die barrel is installed on the connecting part of the base in a sleeve-type manner, and a cushion block is arranged between the die barrel and the supporting part of the base;

[0008] A core rod is arranged inside the mold cylinder, a gasket is arranged at the bottom of the inner ring of the base, and the lower part of the core rod enters the inner ring of the base and is arranged on the gasket;

[0009] The punch is an annular structure, and can be mounted on the upper part of the core rod, and the outer wall of the punch is connected to the inner wall of the die barrel;

[0010] The matching relationship between the core rod and the base is a clearance match, the matching relationship between the punch and the core rod is a clearance match, and the matching relationship between the punch and the die barrel is a clearance match;

[0011] The central axes of the base, die barrel, core rod and punch are collinear;

[0012] The cavity formed among the base, the mold barrel, the core rod and the punch is a medicine pressing cavity.

[0013] The present invention also has the following features:

[0014] Furthermore, the gasket and the cushion block are at the same height.

[0015] Furthermore, the shape of the medicine pressing cavity is "bowl-shaped", "disc-shaped", "blind hole-shaped" or "central stepped hole-shaped".

[0016] Furthermore, the cushion block is in a horseshoe shape or a U shape.

[0017] Furthermore, a handle is fixedly provided on the outer surface of the cushion block.

[0018] Furthermore, the parallelism of the upper and lower surfaces of the punch, die barrel, cushion block and gasket is no more than 0.02 mm;

[0019] The roughness of the medicine pressing cavity is no greater than 1.6 μm.

[0020] A method for forming a special-shaped thin-sheet medicine column, based on the above special-shaped thin-sheet medicine column pressing mold, comprises the following steps:

[0021] Step 1, place the base on the working surface of the press and set the pressure; place a gasket at the bottom of the inner ring of the base, and place a cushion block on the supporting part of the mold barrel; install the core rod and the mold barrel in sequence;

[0022] Step 2, pour the powder into the inner cavity of the mold barrel, and install the punch after pouring; start the press until the upper surface of the punch is flush with the upper surface of the mold barrel, and stop the press after the first step of pressing the powder is completed;

[0023] Step 3, remove the pads and gaskets, and let the press continue to work until the set pressure is reached, then maintain the pressure and release the mold to complete the pressing of the powder and form a special-shaped thin-sheet medicine column.

[0024] Compared with the prior art, the present invention has the following technical effects:

[0025] (Ⅰ) The special-shaped thin-sheet medicine column pressing mold and molding method of the present invention solve the process problems existing in the molding of special-shaped medicine columns, and change the molding process from one-time molding to two-time pressing. First, the medicine powder is pressed for the first time until the upper end surface of the punch is flush with the upper end surface of the mold barrel; then, the pads and washers are adjusted and pressurized again until the set pressure is maintained and the mold is removed. The special-shaped thin-sheet medicine column pressed by the special-shaped thin-sheet medicine column pressing mold of the present invention has a complete structure, no cracks or even ring loss, good physical size consistency, and a qualified appearance without defects. It can solve the process problems of compression molding of special-shaped thin-sheet medicine columns, and the process is safe and reliable, and the product quality is qualified.

[0026] (II) The special-shaped thin-sheet medicine column pressing mold of the present invention has a convenient structure and high reliability. By adding and adjusting the components of the mold, complex special-shaped medicine columns such as sheet-shaped, bowl-shaped, and disc-shaped can be formed, and the pressed medicine columns do not need secondary processing. In addition, the two pressings of the device are both positioning pressing, the process is safe and reliable, the operation is simple and easy, the medicine column structure is consistent, and the yield rate is high, which is suitable for large-scale use and promotion in industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of the special-shaped thin-sheet medicine column pressing mold of the present invention;

[0028] Figure 2 It is a schematic diagram of the structure after the first step of pressing the medicine powder in one embodiment of the present invention;

[0029] Figure 3 It is a schematic diagram of the structure after the medicine powder is compressed in one embodiment of the present invention.

[0030] The meanings of the numbers in the figure are: 1. base; 2. die cylinder; 3. punch; 4. cushion block; 5. core rod; 6. gasket; 7. medicine pressing chamber. DETAILED DESCRIPTION

[0031] It should be noted that all components in the present invention, unless otherwise specified, are all components known in the prior art. Specific embodiments of the present invention are given below. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent changes made on the basis of the technical solution of this application fall within the protection scope of the present invention.

[0032] like Figure 1 As shown, a special-shaped thin-sheet medicine column pressing die comprises a base 1, a die barrel 2 and a punch 3; the base 1 comprises a connecting portion and a supporting portion, the connecting portion is a cylindrical structure, and the supporting portion is an annular structure fixedly connected to the bottom of the connecting portion; the die barrel 2 is installed on the connecting portion of the base 1 in a sleeve-type manner, and a cushion block 4 is arranged between the die barrel 2 and the supporting portion of the base 1;

[0033] A core rod 5 is arranged inside the mold barrel 2, a gasket 6 is arranged at the bottom of the inner ring of the base 1, and the lower part of the core rod 5 sealably enters the inner ring of the base 1 and is arranged on the gasket 6;

[0034] The punch 3 is an annular structure, and the punch 3 can be sealed and sleeved on the upper part of the core rod 5, and the outer wall of the punch 3 is sealed and connected with the inner wall of the die barrel 2;

[0035] The matching relationship between the core rod 5 and the base 1 is a clearance match, the matching relationship between the punch 3 and the core rod 5 is a clearance match, and the matching relationship between the punch 3 and the die barrel 2 is a clearance match;

[0036] The central axes of the base 1, the die cylinder 2, the core rod 5 and the punch 3 are collinear;

[0037] The cavity formed among the base 1 , the mold cylinder 2 , the core rod 5 and the punch 3 is a medicine pressing cavity 7 .

[0038] Among them, the special-shaped thin-sheet medicine column is formed by pressing the medicine powder in the medicine pressing cavity 7 assembled by the punch 3, the mold barrel 2, the core rod 5, and the base 1; the outer diameter of the punch 3, the inner diameter of the mold barrel 2, and the outer diameter of the base 1 have the same nominal diameter and meet the shaft hole fitting tolerance, which is a clearance fit; the punch 3 is installed above the mold barrel 2, and the base 1 is placed at the bottom of the mold barrel 2. The punch 3 is a hollow structure, and the inner diameter of the central opening of the punch 3 is the same as the outer diameter of the rod of the core rod 5 and meets the shaft hole fitting tolerance, which is a clearance fit. The rod body of the core rod 5 is inserted into the central inner hole of the punch 3, and the core rod 5 is installed in the base 1, located below the punch 3.

[0039] It should be noted that, when the special-shaped thin-sheet medicine column pressing mold of the present solution is working, the positioning effect can be achieved through the cooperation of various components in the mold.

[0040] As a preferred solution, the gasket 6 and the pad 4 are of the same height. The height of the gasket 6 and the pad 4 is the key to adjusting the uniformity of the density of the special-shaped thin-sheet grain. The same height of the gasket 6 and the pad 4 can further ensure the uniformity of the density of the special-shaped thin-sheet grain.

[0041] As a preferred solution, the size of the formed irregular thin-sheet drug column is guaranteed by the size of the drug pressing cavity 7 surrounded by the punch 3, the die barrel 2, the base 1, and the core rod 5. The shape of the drug pressing cavity 7 is a thin cylindrical shape with a central stepped hole, or a "bowl-shaped", "disc-shaped", "blind hole-shaped", "central stepped hole-shaped" and other irregular-shaped drug column shapes. It can be determined according to the actual needs of the mold design, and the accuracy of the drug column molding size is guaranteed by the machining accuracy of the mold inner cavity.

[0042] As a preferred solution, the cushion block 4 is in a horseshoe shape or a U shape.

[0043] As a preferred solution, a handle is fixedly provided on the outer surface of the cushion block 4. For easy picking, the handle can be fixed by screw holes or welded. For example, a threaded hole of M3-6H is processed on the outer surface of the cushion block, and a handle with an outer diameter of M3 is processed. The handle is fixed to the cushion block by thread connection, and a certain amount of thread glue is applied in the thread gap to prevent the thread from loosening. The handle can also be welded and fixed.

[0044] Specifically, the parallelism of the upper and lower surfaces of the punch 3, the die barrel 2, the cushion block 4 and the gasket 6 is no greater than 0.02 mm;

[0045] The roughness of the medicine pressing cavity 7 is not greater than 1.6 μm.

[0046] A method for forming a special-shaped thin-sheet medicine column, based on the above-mentioned special-shaped thin-sheet medicine column pressing mold, comprises the following steps:

[0047] Step 1, place the base 1 on the working surface of the press and set the pressure; place a gasket 6 at the bottom of the inner ring of the base 1, and place a cushion block 4 on the supporting part of the mold barrel 2; install the core rod 5 and the mold barrel 2 in sequence;

[0048] Step 2, pour the powder into the inner cavity of the mold barrel 2, and install the punch 3 after the pouring is completed; the overall device state at this time is as follows Figure 1 As shown;

[0049] The press starts working until the upper surface of the punch 3 is flush with the upper surface of the die barrel 2. After the first step of pressing the powder is completed, the press is stopped. The overall device state at this time is as follows: Figure 2 As shown;

[0050] Step 3, remove the pad 4 and the gasket 6, and let the press continue to work until the set pressure is reached. The overall device status at this time is as follows: Figure 3 As shown; then the pressure is maintained and the mold is removed to complete the pressing of the medicine powder and form a special-shaped thin-sheet medicine column.

[0051] It should be noted that according to the conventional operating requirements in this field, when using this device, first clean the work surface and place the base 1 horizontally on the working surface of the press, wherein the press is a commonly used equipment known in this field, which plays a pressing role on the special-shaped thin-sheet medicine column pressing mold of this application. When the press is working, pressure is applied to the special-shaped thin-sheet medicine column pressing mold to achieve the pressing molding of the medicine column.

[0052] Place the washer 6 horizontally in the inner hole of the base 1, install the core rod 5, and then place the cushion block 4 horizontally on the upper surface of the base 1, install the mold barrel 2, assemble the mold barrel 2, the base 1, the core rod 5, the cushion block 4, and the washer 6 into one, and check to make sure that each part is assembled correctly and fits properly. When pouring the powder into the mold barrel 2 and installing the punch 3, it should be ensured that the punch 3 and the core rod 5, and the punch 3 and the mold barrel 2 are assembled correctly and fit properly.

[0053] This embodiment changes the molding process from one-time molding to two-time pressing. First, the powder is pressed for the first time until the upper end surface of the punch 3 is flush with the upper end surface of the die barrel 2; then, the pad 4 and the gasket 6 are adjusted and pressurized again until the set pressure is maintained and the mold is withdrawn. The pressed special-shaped thin-sheet medicine column has a complete structure, no cracks or even ring loss, good physical size consistency, and a qualified appearance without defects. It can solve the process difficulties of molding special-shaped thin-sheet medicine columns, and the process is safe and reliable, and the product quality is qualified.

[0054] At the same time, this solution also has the advantage of high reliability. By adding and adjusting the components of the mold, complex and special-shaped medicine columns such as sheets, bowls, and discs can be formed, and the pressed medicine columns do not need secondary processing. In addition, the two pressings of this device are both positioning pressings, the process is safe and reliable, the operation is simple and easy, the medicine column structure is consistent, and the yield rate is high, which is suitable for large-scale use and promotion in industry.

Claims

1. A special-shaped thin-sheet medicine column pressing mold, characterized in that: The invention comprises a base (1), a die barrel (2) and a punch (3); the base (1) comprises a connecting portion and a supporting portion, the connecting portion is a cylindrical structure, and the supporting portion is an annular structure fixedly connected to the bottom of the connecting portion; the die barrel (2) is installed on the connecting portion of the base (1) in a sleeve-type manner, and a cushion block (4) is provided between the die barrel (2) and the supporting portion of the base (1); A core rod (5) is arranged inside the mold cylinder (2), a gasket (6) is arranged at the bottom of the inner ring of the base (1), and the lower part of the core rod (5) enters the inner ring of the base (1) and is arranged on the gasket (6); The punch (3) is an annular structure, and the punch (3) can be mounted on the upper part of the core rod (5), and the outer wall of the punch (3) is connected to the inner wall of the die barrel (2); The matching relationship between the core rod (5) and the base (1) is a clearance match, the matching relationship between the punch (3) and the core rod (5) is a clearance match, and the matching relationship between the punch (3) and the die barrel (2) is a clearance match; The central axes of the base (1), the mold cylinder (2), the core rod (5) and the punch (3) are collinear; The cavity formed among the base (1), the mold cylinder (2), the core rod (5) and the punch (3) is a medicine pressing cavity (7).

2. The special-shaped thin-sheet medicine column pressing mold according to claim 1, characterized in that: The gasket (6) is at the same height as the cushion block (4).

3. The special-shaped thin-sheet medicine column pressing mold according to claim 1, characterized in that: The shape of the medicine pressing cavity (7) is "bowl-shaped", "disc-shaped", "blind hole-shaped" or "central stepped hole-shaped".

4. The special-shaped thin-sheet medicine column pressing mold according to claim 1, characterized in that: The cushion block (4) is in a horseshoe shape or a U shape.

5. The special-shaped thin-sheet medicine column pressing mold according to claim 4, characterized in that: A handle is fixedly arranged on the outer surface of the cushion block (4).

6. The special-shaped thin-sheet medicine column pressing mold according to claim 4, characterized in that: The parallelism of the upper and lower surfaces of the punch (3), the die cylinder (2), the cushion block (4) and the gasket (6) is no greater than 0.02 mm; The roughness of the medicine pressing cavity (7) is no greater than 1.6 μm.

7. A method for forming a special-shaped thin-sheet medicine column, the method is based on the special-shaped thin-sheet medicine column pressing mold according to claim 6, characterized in that: The steps include: Step 1, placing the base (1) on the working surface of the press and setting the pressure; placing a gasket (6) at the bottom of the inner ring of the base (1), and placing a cushion block (4) on the supporting part of the mold barrel (2); installing the core rod (5) and the mold barrel (2) in sequence; Step 2, pouring the powder into the inner cavity of the mold barrel (2), and installing the punch (3) after the pouring is completed; starting the press until the upper surface of the punch (3) is flush with the upper surface of the mold barrel (2), and stopping the press after the first step of pressing the powder is completed; Step 3, remove the cushion block (4) and the gasket (6), and allow the press to continue to work until the set pressure is reached, then maintain the pressure and remove the mold to complete the pressing of the powder to form a special-shaped thin-sheet medicine column.

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