RU2710584C1 - Method of producing ammunition bodies - Google Patents

Abstract

FIELD: weapons and ammunition.

SUBSTANCE: invention relates to method of producing ammunition cases and, in particular, artillery projectiles, min. Method of making ammunition bodies consisting of a shell and a bottom part includes making a workpiece of a bottom part using hot machining from a rod. At that, provision is made for the workpiece of the shell by mechanical machining by cutting from the pipe, for machining by machining workpieces of bottom part and shell with semi-finished dimensions. Non-detachable connection of shell and bottom part is ensured by friction welding. Then thermal treatment of non-detachable connection zone is provided, machining is machined by cutting for crimping and crimping ogival part, heat treatment, machining by cutting of ammunition body into finish size. There is a version of fabrication of shell workpiece from several parts with further obtaining of their permanent connection by means of friction welding.

EFFECT: high manufacturability of the fabrication, which increases efficiency of manufacturing while reducing the cost of articles.

1 cl, 8 dwg

Description

The invention relates to a method for the production of ammunition, namely to the production of shells, for example artillery shells, mines, etc.

The shells of artillery shells are made in the form of a shell consisting of bodies of revolution (cylinder, cone, paraboloid and their combinations), and the bottom. Regulatory documentation provides for the manufacture of cases from parts and assembly units by welding, as well as their supply from several factories for cooperation.

The shell shell blanks are made by casting, or by hot machining on hydraulic presses with a force of 500-1000 tf, followed by machining on metal cutting machines. Hot machining (stamping) is carried out in several transitions. The result is a cylindrical glass, which is first subjected to rough machining on the outer and inner surfaces, and then hot crimped on mechanical presses to form the animated part. In the process of final machining, the full profile of the body is obtained by turning on hydrocopying lathes or CNC machines.

A known method of manufacturing shell shells (US Pat. RU 2179587, IPC C21D 9/16, publ. 02.20.2002), including the operation of hot plastic processing (stamping), machining and hot crimping, and after hot plastic processing provides additional heat treatment of steel blanks. The disadvantage of this method is the need to use when stamping the shells of shells of heavy press equipment.

In patent RU No. 2248514, IPC F42B 12/22, publ. 03/20/2005, adopted as a prototype, describes a method of manufacturing a shell artillery shell. According to this method, the shell of the projectile is made of two precision parts: a cylindrical shell and a bottom part. Manufactured autonomously by various autonomous technologies. In this case, the semi-finished product of the bottom part is obtained from the bar stock for two hot stamping transitions (draft and flashing) on the press, and a measuring tube is used as the blank for the shell of the body. After hard joining with the use of sealant of the semi-finished bottom part with a cylindrical billet, the final machining is performed by cutting the surface of the body. This method does not provide the necessary mechanical strength of the structure, and also requires heavy press equipment (hydraulic presses).

The objective of the present invention is to improve manufacturability, providing a technical result: an increase in the productivity of manufacturing shells of ammunition while reducing the cost of products.

The problem is solved due to the fact that in the method of manufacturing the shells of ammunition, the manufacture of shell blanks and the bottom takes place according to different rational technologies:

- the billet of the bottom part is made of a bar by hot machining (stamping on crank presses),

- shell blank - from a thick-walled pipe by machining.

After machining by cutting the blanks of the bottom part and the shell in semi-finished dimensions, an inseparable connection is obtained by friction welding, followed by heat treatment of the zone of the inseparable connection. After receiving it came to life (machining by crimping and crimping the live part), heat treatment of the ammunition body and machining by cutting the product to the final size are carried out. A variant of the manufacture of the shell blank from several parts with the subsequent receipt of their permanent connection using friction welding is possible.

Improving manufacturability - reducing the total number of technological operations, and especially costly pressure processing operations requiring specialized unique equipment, increases productivity while significantly reducing production costs. In addition, the use of friction welding allows you to weld both the shell of the projectile and the shell parts made of different steel grades, materials and their combinations with minimal deviations in mass and coincidence of theoretical and real centers of mass.

Practical mass production of shells of ammunition can be deployed using the capacities of machine-building enterprises with a fleet of metalworking machines and assembly plants equipped with equipment for friction welding.

The essence of the proposed method for the manufacture of shells of ammunition is illustrated in the drawing, where in FIG. 1 depicts the manufacturing process of the manufacture of shells of ammunition, consisting of the following sequence of operations:

a) the manufacture of the bottom of the bar by hot machining (stamping) on a crank press;

b) obtaining shell blanks by cutting a thick-walled pipe into multiple measured blanks. It is possible to obtain several blanks of the shell, including from different materials;

c) machining by cutting the blanks of the bottom and shell with semi-finished dimensions for friction welding;

d) friction welding of the shell blanks (one or more) and the bottom — the combination of the end surfaces and their permanent connection by imparting axial translational and / or rotational movements of the joined blanks. Removing "excess" extruded metal in a friction welding installation;

d) heat treatment of the weld zone;

f) machining by crimping the live part;

g) crimping the animating part on the crank press, the receipt came to life;

h) heat treatment of the munition shell to obtain the mechanical properties specified by the design documentation;

i) fine machining - giving the body of the ammunition the final dimensions.

The proposed method allows to increase the productivity of the release of shells of ammunition through the use of cooperation of enterprises manufacturing initial stocks, performing mechanical processing and final assembly. The technological chain can be organized at several enterprises, and in case of mobilization needs it is enough to simply use the fleet available at the enterprises of machine tools for the needs of shell shell production.

The existing technology for the production of ammunition cases requires for each product its own technological equipment, measuring tools, and specialized machine tools. Unification of the sizes of the initial billets will make it possible to obtain the entire range of shell shells and mines, shorten the time for putting products into production and increase the productivity of manufacturing products.

In addition, minimizing the costly operation of hot machining (stamping) using hydraulic presses. The bottom part blank can be obtained from a bar stock on a crank press. Processing of a measuring pipe - a workpiece for the shell of the body, is carried out on standard machines with numerical control.

A comparison of the proposed technical solution with the identified analogues of the prior art did not reveal an identical match of the totality of the essential features of the invention.

The proposed method for the manufacture of shells of ammunition is not obvious to specialists and does not directly follow from the statement of the technical problem.

From the foregoing, we can conclude that the invention meets the conditions of patentability.

Claims (2)

1. A method of manufacturing shells of ammunition consisting of a shell and a bottom, including the manufacture of a billet of the bottom using hot machining from a bar, the manufacture of a billet of the shell by machining from a pipe, machining of the blanks of the bottom and the shell with semi-finished dimensions, obtaining one-piece joints of the shell and the bottom by friction welding, heat treatment of one-piece joints, machining by crimping and crimping part, heat treatment, machining by cutting the shell of the ammunition in the final size. 2. A method of manufacturing the shells of ammunition according to claim 1, characterized in that the shell blank is made of several parts, obtaining an integral connection of the shell parts is carried out by friction welding.

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