RU2451002C1 - Method of fabricating thin-layer powder-filled fuses - Google Patents

Abstract

FIELD: weapons and ammunition.

SUBSTANCE: method comprises loading heated powder block into vertical hydraulic press barrel, creating pressure therein, extruding powder block through shaping tool, displacing and cooling extruded article in guide slot. Billet is automatically cut to preset length in cutter blade plane locate, at least, 0.5 mm from guide sleeve bottom end face. Cut billet is transferred to receiving cabin by gravity feed.

EFFECT: no interference of personnel, higher safety and lower labor input.

2 dwg

Description

The present invention relates to the manufacture of thin-bore tubular ballistic gunpowder by press technology used for artillery charges.

Known methods for the manufacture of fine ballistic tubular powders. One of them is based on screw technology of continuous pressing and is described in the book by L. A. Smirnov “Equipment for the production of ballistic powders by screw technology and charges from them”, Moscow State Academy of Chemical Engineering, 1997, p.118-119.

Fine gunpowder includes artillery tube gunpowder with a coefficient of elasticity, i.e. attitude

,

,

where e is the thickness of the arch (wall),

Dn - the outer diameter of the tube.

According to the above method, the manufacture of powder tubes is carried out by continuously passing through the pressing of the powder mass in a plastic state simultaneously through a group of matrices. Tubes in the form of cords are fed to a separate mechanical knife, where they are cut to a predetermined size. When cutting, the tubes abut against the outer side surface. One of the necessary conditions for ensuring the quality of cut tubes is associated with an elastic coefficient that should be at least 0.15. With a smaller value, tube collapse is observed. This is a disadvantage of the method. In addition, the method does not exclude the presence of people in the process of cutting tubes, including in the cab of a working screw press, which is unacceptable by safety standards.

Closest to the technical nature of the present invention is a method of manufacturing a workpiece charge of ballistic solid rocket fuel according to patent RU 2337087, the application. 01/25/2007, publ. 10/27/2010, IPC С06В 21/00. The authors adopted this method as a prototype. In accordance with it, the manufacture of fine-bore powder tubes is carried out using a vertical hydraulic press by laying in a glass of a heated powder block and then forcing it through a multi-strand forming tool. Molded powder tubes in the form of continuous cords enter the receiving cabin, where they are manually cut to a predetermined length. The disadvantages of the prototype are the lack of the ability to manufacture powder tubes with an elastic coefficient ≤0.15, as well as the danger and increased complexity of the technological process of their manufacture.

The objective of the invention is to create a method for the manufacture of powder tubes with an elastic coefficient ≤0.15 while maintaining a given geometric shape (without crushing the ends) while improving productivity and process safety.

The essence of the proposed method is illustrated in figure 1 and the diagram of the proposed method of figure 2. In Fig. 1, according to the proposed method, the powder block heated to the temperature of plastic deformation is loaded into the hydropress cup 1, pressurized and pressed through the forming tool 3. The extrudate is passed in the gap between the continuation of the forming sleeve 4 and the needle 5, the mutual arrangement of which forms a guide gap with a cross section greater than the forming gap. During the movement of the extrudate along the guide gap, it cools, and the bounding surfaces of the sleeve 4 and the needle 5 keep the extrudate from deforming and at the same time do not impede its movement, and at the time of its cutting serve as supports that absorb the cutting force of the extrudate. At the exit from the guide gap, the extrudate is remotely automatically measured and cut to a predetermined length in the plane of the blade of the knife, spaced from the plane of the end face of the sleeve 4 at a distance A equal to at least 0.5 mm, necessary for cutting it without wrinkling the ends. Cut pieces by gravity enter the receiving cabin. However, they do not acquire permanent deformation (collapse).

Thus, the proposed method allows you to make fine-welded powder tubes with an elastic coefficient ≤0.15, the technical result of which is achieved by sequentially installing a heated powder block in a glass 1 of a hydraulic press 2, creating pressure and pressing through a forming tool 3. An extrudate of a thin-walled cylindrical shape is passed through a guide gap between the sleeve 4 and the needle 5, and at the exit from the gap there is a remote automatic high-quality cutting it to a given length without crushing the ends. The proposed method eliminates the presence of people in the cockpit of a working screw press and in the process of cutting powder tubes, which ensures its safety, reducing the complexity of the process.

The proposed method has been tested on inert and full-scale formulations under the conditions of FKP "PPZ" with positive results.

Claims (1)

A method of manufacturing fine-welded powder tubes, including loading a heated powder block into a glass of a vertical hydraulic press, creating a pressure in the glass, pressing the powder block through a forming tool, characterized in that after molding the extrudate is kept from deformation in the guide gap between the needle and the sleeve while cooling and cutting to a predetermined length is automatically carried out remotely in the plane of the blade of the knife, spaced from the end of the sleeve at a distance of at least 0.5 mm.

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