A method for pressing a grain with a prefabricated crack

Abstract

The present invention belongs to the technical field of shaped charge and explosive forming, and proposes a method for pressing charge columns with preset prefabricated cracks. It includes Step 1: Design the number of cracks in advance according to the size of the charge column of the warhead and the characteristics of the explosive; Step 2: Weigh the charge of the charge column into equal parts according to the number of prefabricated cracks of the charge column; Step 3: Divide the prefabricated cracks into axial and radial directions according to the direction of the prefabricated cracks of the charge column; Step 4: Place the prepared wax paper according to the position of the prefabricated cracks, and pour the powder into it for pressing the charge column. By artificially prefabricating a crack during the pressing process of the charge column, the present invention provides a release channel for stress, and releases the stress generated during the pressing process of the charge column in a predetermined manner, thereby eliminating the potential safety hazards caused by the random release of the stress of the charge column.

Description

Technical Field

[0001] The present invention belongs to the technical field of explosive forming, and particularly relates to a method for pressing a charge with pre-set prefabricated cracks. Background Art

[0002] The explosive pressing method is one of the widely used charging methods in ammunition charging, and has the advantages of wide application range, short production cycle, etc. The pressing and forming device, also known as the pressing die, is an important process equipment in the pressing method.

[0003] The pressing method has the characteristics of high filling ratio, few defects, many types of explosives, wide pressing range, etc., and is widely used in warheads filled with high-energy mixed explosives. In recent years, with the rapid development of missile warheads, the charge weight has become larger and larger, and there are more and more large-sized and high-density pressed charge columns. In order to achieve high blasting energy and increase the charge weight, the charge density is maximally increased within a limited space. As the charge density increases, the internal stress of the pressed charge column increases. Although various means are used to improve stress release, it cannot be completely eliminated. Usually, cracks will still occur in the charge column. This not only poses a safety hazard to the warhead, but also causes certain economic losses to the company. To solve the problem of charge column cracks, a new charge column pressing method is designed to prefabricate a crack in the charge column to allow the stress to be released along the crack. Summary of the Invention

[0004] The inventors have been engaged in explosive production work for many years. Through years of exploration and research, a method for pressing a charge with pre-set prefabricated cracks is proposed. The purpose is to artificially prefabricate a crack during the charge column pressing process to provide a release channel for the stress, and release the stress generated during the charge column pressing process in a predetermined manner, thereby eliminating the safety hazard caused by the random release of the charge column stress.

[0005] To achieve the above object, the technical solution adopted by the present invention is to propose a method for pressing a charge with pre-set prefabricated cracks, including the following steps:

[0006] Step 1: Design the number of cracks in advance according to the size of the warhead charge column and the characteristics of the explosive;

[0007] Step 2: Weigh the charge weight of the charge column into equal parts according to the number of prefabricated cracks in the charge column;

[0008] Step 3: Divide the prefabricated cracks into axial and radial directions according to the direction of the prefabricated cracks in the charge column;

[0009] Step 4: Place the prepared wax paper according to the position of the prefabricated crack. When setting an axial crack, place the pre-prepared wax paper at the center of the mold with a tooling. Pour equal amounts of weighed powder on both sides of the wax paper, smooth and press the powder, slowly withdraw the tooling, and the wax paper remains in the powder, then start pressing; when setting a radial crack, pour one equal portion of weighed powder into the mold, smooth and compact the powder, place the prepared wax paper, pour another equal portion of powder, and compact while adding powder. After all the powder is poured, press the powder column.

[0010] The beneficial effects of the present invention are as follows: (1) The present invention is a method for pressing powder to set prefabricated cracks in the powder column, which uses prefabricated wax paper axially or radially in the powder column to release the stress generated during the pressing process of the powder column through the prefabricated crack method, thereby ensuring the quality of powder pressing and increasing the charging density. (2) By artificially prefabricating a crack during the pressing process of the powder column, a release channel is provided for the stress, and the stress generated during the pressing process of the powder column is released in a predetermined manner, thereby eliminating the potential safety hazards caused by the random release of the stress of the powder column. Description of the Drawings

[0011] Figure 1 It is a top view structural schematic diagram of the powder column for setting prefabricated cracks radially in the present invention;

[0012] Figure 2 It is a side view structural schematic diagram of the powder column for setting prefabricated cracks radially in the present invention;

[0013] Figure 3 It is a top view structural schematic diagram of the powder column for setting prefabricated cracks axially in the present invention;

[0014] Figure 4 It is a front view structural schematic diagram of the powder column for setting prefabricated cracks axially in the present invention. Embodiment

[0015] The following further illustrates the method steps of the present invention in combination with the drawings and embodiments, and its steps and advantages will be clearer. Example

[0016] According to the size and weight of the powder column 1, design a radial prefabricated crack for the powder column 1;

[0017] According to the diameter size of the powder column 1, prepare a wax paper 2 with a diameter slightly larger than the diameter of the powder column 1;

[0018] According to the mass of the powder column 1, weigh the powder into two equal masses;

[0019] Pour one portion of the powder into the prepared mold, and smooth and compact the powder;

[0020] Put in the wax paper 2;

[0021] Pour in another portion of the same mass of the medicinal powder, and smooth and compact it while adding the medicinal powder;

[0022] Install the die punch and press the propellant column 1;

[0023] After pressing, remove the die, take out the propellant column 1, and chamfer the propellant column 1. Embodiment

[0024] 1. Design an axial prefabricated crack for the propellant column 1 according to the size and weight of the propellant column 1;

[0025] 2. Prepare a wax paper 2 with a height higher than the height of the propellant column 1 and a diameter slightly larger than the diameter of the propellant column 1 according to the height dimension of the propellant column 1;

[0026] 3. Weigh the medicinal powder into two portions of the same mass according to the mass of the propellant column 1;

[0027] 4. Use the tooling to vertically place the wax paper 2 at the center of the die of the propellant column 1;

[0028] 5. Pour the two portions of the same mass of the medicinal powder into the dies on both sides of the wax paper 2 respectively, and smooth and compact the medicinal powder;

[0029] 6. Slowly draw out the tooling, the wax paper 2 remains in the medicinal powder, install the die punch, and press the propellant column 1;

[0030] 7. After pressing, remove the die, take out the propellant column 1, and chamfer the propellant column 1.

[0031] The present invention is a propellant pressing method for setting a prefabricated crack in the pressing of the propellant column 1. By prefabricating the wax paper 2 axially or radially in the propellant column 1, the stress generated during the pressing of the propellant column 1 is released through the prefabricated crack method, so as to ensure the propellant pressing quality and improve the loading density; by artificially prefabricating a crack during the pressing of the propellant column 1, a release channel is provided for the stress, and the stress generated during the pressing of the propellant column 1 is released in a predetermined manner, thereby eliminating the potential safety hazards caused by the random release of the stress of the propellant column 1.

Claims

1. A method for pressing a grain with a prefabricated crack, characterized in that, It includes the following steps: Step 1: Design the number of cracks in advance according to the size of the warhead charge and the characteristics of the explosive; Step 2: Weigh the charge of the charge into equal parts according to the number of prefabricated cracks in the charge; Step 3: Divide the prefabricated cracks into axial and radial directions according to the direction of the prefabricated cracks in the charge; Step 4: Place the prepared wax paper according to the position of the prefabricated cracks. When setting axial cracks, place the prepared wax paper in the center of the mold with a tooling. Pour the weighed equal-dose charge powder on both sides of the wax paper, smooth and press the powder, slowly withdraw the tooling, and the wax paper remains inside the powder, and start pressing; when setting radial cracks, pour the weighed equal-dose charge powder into the mold, smooth and compact the powder, put the prepared wax paper, and pour the equal-dose charge powder again, and compact while adding the powder. After all the powder is poured, press the charge; the number of cracks is 1.

2. The method for pressing a grain with a preset pre-crack as described in claim 1, characterized in that None of the wax papers are taken out and remain inside the charge.

3. The method for pressing a grain with a preset crack according to claim 1, characterized in that, It further includes Step 5: After pressing is completed, remove the mold, take out the charge, and chamfer the charge.

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