RU2662537C1 - Rigid combustible cap for the propellent charges of the mortar rounds - Google Patents

Abstract

FIELD: weapons and ammunition.

SUBSTANCE: invention relates to the production of propellent charges (PC) in rigid combustible caps (RCCs). Rigid combustible cap for throwing charges of mortar shots of the horseshoe shape consists of the two halves with a lateral seam, with a cavity between the half-shells for the placement of gunpowder, with the opening in the middle of the cap under the mine stabilizer tube, with the groove between the "legs" of the cap in order to put the cap on the stabilizer tube, which are connected together by means of gluing, welding, soldering. In the middle of the cap on the side opposite the groove for putting the cap on the mine, the X-shaped pad is performed, its size is equal to 15×8 mm with the angle of rotation of two parts relative to each other up to 55°.

EFFECT: design ensures uniform distribution of gunpowder along the diameter of the mine stabilizer, while reducing the probability of gapping at the point of greatest stress, facilitating the installation and increasing the effectiveness of mounting the cap on the mine liner, as well as eliminating the movement along the length of the mine stabilizer tube.

1 cl, 2 dwg

Description

The invention relates to the field of production of propellant charges (MOH) in hard burning cartridges (HBC).

Known constructions of rigid combustible caps from a material based on cellulose nitrates [1-3] horseshoe-shaped, consisting of two halves interconnected by gluing, welding, soldering.

In the analogue of [1], to avoid turning the cap around the stabilizer tube and effectively fasten the cap, it is proposed to use a special lock, which is the protrusions on both sides, which are inserted on one side into the groove of the other cap and, on the other hand, are attached to the mine tail. It is also proposed to use locks in the form of Velcro pads of the tape, which is a "Velcro" for fastening, made of the material of the cap.

By analogy [2], a cap design is proposed, consisting of two halves symmetrical with respect to the stabilizer tube, having convex-concave parts that resemble a puzzle in shape. Mounting occurs by inserting one half into the second half on the stabilizer tube, forming a lock.

In the design [2, 3], powder is poured into the bulk of the cap, which leads to an uneven distribution of charge mass and instability of ballistic characteristics.

The use of Velcro tape [1] and the complicated design of the cap according to the patent [2] makes it difficult to put on and remove an additional propellant charge on a mortar shell, which increases the preparation time of the shot and reduces the rate of fire of the mortar.

The closest adopted for the prototype of the present invention is the design of a hard, burning horseshoe-shaped cap, consisting of two halves interconnected by gluing, welding, soldering, developed by the US patent [3] for a mortar shot (Fig. 1). The cartridge 1 (Fig. 1) consists of the upper part of the neck cover 2, the lower part of the neck cover 3, the neck for filling the powder 4, the upper half shell 5, the weld 6, the lower half shell 7, the stiffening ribs 8 two half shells 5 and 7 form a cavity for gunpowder placement, in the middle of the cap there is a hole 9 under the mine stabilizer tube, between the “legs” of the cap there is a groove 10 for putting the cap on the stabilizer tube. The cap is mounted on a mine by pushing the cap perpendicular to the axis of the mine stabilizer tube through groove 10.

Since the diameter of the stabilizer tube is larger than the groove 10, due to the plasticity of the material of the cap, the "legs" are moved apart in the longitudinal direction relative to each other. In this case, internal stress arises in the material of the cap, the resistance arising in the material tends to collapse of the "legs". As soon as the stabilizer tube is inserted into the hole 9, the "paws" return to their original state, and the stresses in the material of the cap relax, the cap returns to its original shape and size. Between the inner part of the cap and the stabilizer tube, a contact area is formed, which provides fastening. Stiffeners do not fully provide stress relief in the material of the cap, which leads to the destruction of the weld 6 of the cap 1.

The disadvantages of the prototype are:

- inefficiency of fastening the cap on the mine due to the shift of the cap relative to each other and along the length of the stabilizer tube;

- violation of the integrity of the seam of the cap due to stresses that accumulate when putting on / removing from the stabilizer tube;

- pouring powder in the volume of the cap when loading, which affects the stability of ballistic characteristics.

The objective of the invention is to increase the efficiency of attaching an additional MZ in a hard burning cap on the tube of the mine stabilizer and to prevent the mass of propellant from being poured into the volume of the cap when the position of the mine changes during operation.

The problem is solved due to the fact that the hard burning cartridge case for horseshoe-shaped mortar shots, consisting of two halves connected by gluing, welding, soldering, is characterized by the fact that it has an X-shaped area 15 × 8 mm in size located in the middle of the cartridge case on the side opposite the groove for putting on the cap on the mine, with an angle of rotation of two parts relative to each other up to 55 °.

A new cap design is shown in FIG. 2: 11 - X-shaped area between the hollowed out hills passing along the axis of the cap opposite the groove 10, 12 - glued seam of the cap.

Thus, the development of a new design of ZhSK provides the solution of the following tasks:

- uniform distribution of gunpowder along the diameter of the mine stabilizer (exclusion of pouring from one half to the other)

- reducing the likelihood of seams diverging at the point of greatest stress (in the center of the product);

- facilitating installation and increasing the efficiency of fastening the cap on the mine tail (the cap is firmly held on the stabilizer tube, excluding rotation around the axis) and eliminating movement along the length of the mine stabilizer tube.

1. Finland patent No. WO 2009FI50052 dated 01.20.2009 IPC F42B 30/12. Method for fastening increment charges to mortar shell, shell and increment charge / Mahla Seppo, Niemi Pekka.

2. Poland patent No.PL 20150411682 dated 03.20.2015 IPC Single layer, additional mortar propellant charge / Zarzycki Bohdan, Piatek Bogdan, Miszczak Maciej

3. US patent No.CA 2652645 from 08/07/2009. IPC F42B 39/00. Nitrocellulose composition an uses therefor / Gottwald Werner.

Claims (1)

Rigid burning cap for horseshoe-shaped mortar rounds, consisting of two halves with a side seam, with a cavity between the half-shells for the placement of gunpowder, with an opening in the middle of the cap under the mine stabilizer tube, with a groove between the “legs” of the cap for putting the cap on the stabilizer tube interconnected by gluing, welding, soldering, characterized in that it has an X-shaped area measuring 15 × 8 mm, located in the middle of the cap on the side opposite to the slot for putting on a cap on mine, with an angle of rotation of two parts relative to each other up to 55 °.

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