RU2616922C1 - Method for producing charge of mixed rocket solid fuel - Google Patents

Abstract

FIELD: weapons and ammunition.

SUBSTANCE: producing charge of mixed rocket solid fuel comprises making and draining fuel supply to the charge housing formed with a channel-forming tooling. At the final draining stage when the free fuel supply draining to the housing terminates according to the instrument data the mixer is filled with inert gas under pressure providing free fuel supply draining to the housing, the pressure is periodically increased as long as the free fuel supply draining terminates until the housing is filled up to the top which is recorded with pressure sensors located on the channel forming tooling. Then the charge is held in the mixer at atmospheric pressure.

EFFECT: method enables the housing located above the draining hole to be filled with the fuel supply, and reduces consumption of the expensive mixed rocket solid fuel for making the charge.

2 ex

Description

The invention relates to the field of production of rocket technology, and in particular to the technology of manufacturing large-sized charges of mixed solid rocket fuel (SRTT) by free casting.

The prior art method for the manufacture of mixed solid fuel charges according to the patent of the Russian Federation No. 2230052 (publication date 06/10/2004), including the preparation and discharge of fuel mass into the charge housing, assembled with channel-forming equipment.

There is also known a method of industrial production of a charge of mixed solid rocket fuel according to the patent of the Russian Federation No. 2194687 (publication date 12/20/2002), including the preparation and discharge of fuel mass into the charge body by free casting.

Closest to the proposed invention is a method of manufacturing charges of mixed solid rocket fuel according to the patent of the Russian Federation No. 2508464 (publication date 10.11.2013), including the preparation and discharge of the fuel mass in the charge housing, assembled with channel-forming equipment.

However, the described methods have the following disadvantages: in the process of forming modern bulky charges by free casting of the fuel mass into a housing assembled with a channel-forming tool, the channel-forming tool is the only place for the drain hole to be placed, while a significant body volume remains over the drain hole, which must be filled with fuel in the molding process mass. To fill this volume and ensure solid charge it is necessary to increase the consumption of the fuel mixture by 5-10%.

The objective of the present invention is to develop a method of manufacturing large charges of SRTT by free casting of fuel mass into a housing assembled with a channel-forming tool through an opening in a channel-forming tool, which ensures guaranteed filling of the body volume located above the drain hole with fuel mass and reducing the cost of the expensive SRTT required to make a charge .

The problem is solved by the proposed method for manufacturing large-sized charges of mixed solid rocket fuel by the free casting method, which includes the preparation and discharge of the fuel mass into the charge housing assembled with channel-forming equipment, while at the final stage of discharge, after the free flow of the fuel mass into the body, determined by readings, the mixer is filled with inert gas at a pressure that ensures the flow of fuel mass into the housing, periodically increasing the pressure e as is discontinued outflow fuel mass, until complete filling of the housing, which is detected by pressure sensors disposed on the channel forming snap, followed by aging under atmospheric pressure of the charge in the mixer.

The supply of inert gas at the final stage of the drain allows you to overcome the hydrostatic pressure of the fuel mass in the volume of the housing located above the drain hole, and to ensure reliable filling of the entire volume of the housing. A periodic increase in inert gas pressure allows the fuel mass to flow into the housing under a slight overpressure compared to the hydrostatic pressure of the fuel mass above the drain hole, which reduces the likelihood of gas leakage into the charge volume. Exposure after each increase in pressure is necessary to spread the fuel mass in the housing and to reduce the likelihood of gas leakage into the volume of the formed charge. The increase in pressure and the duration of the time periods between them are determined by the rheological properties of the fuel mass, the design of the mixer and the drain neck, channel-forming equipment.

The advantages of the proposed method lies in the fact that it allows you to guaranteed to fill with fuel the volume of the housing located above the drain hole. In addition, the method allows to reduce the required level of fuel mass in the mixer at the last discharge, ensuring that the volume of the housing located above the drain hole in the channel-forming needle is completely filled, thereby reducing the cost of the costly SRTT necessary for making a charge.

To explain the implementation of the proposed method provides examples of specific performance.

To implement this purpose, the claimed method at the initial stage of charge production involves the implementation of the well-known and widely used in the industry operations of the free casting method: installation of the housing assembled with channel-forming equipment in the pressure chamber, evacuation of the pressure chamber and housing before draining the fuel mass from the mixer into the housing, valid for all examples specific implementation.

Example 1

In the process of forming a large charge weighing 15 tons after the termination of the free flow of fuel from the mixer at the last discharge, determined by the readings of the mass measuring device, an inert gas (e.g. nitrogen) is supplied to it to a pressure of 50 mm Hg. The expiration of the fuel mass lasts 1 hour. Then the pressure is increased by another 120 mmHg, free flow resumes. So repeat 3 times, periodically increasing the pressure by 150-160 mm Hg until the housing is completely filled with fuel mass, which is recorded by pressure sensors installed on channel-forming equipment and atmospheric pressure in the mixer is reached. After the housing is completely filled with fuel mass, the charge is held for 2 hours at atmospheric pressure in the mixer.

Example 2

A bulky charge weighing 350 kg is produced in one drain. After the free flow of fuel mass, determined by the readings of the mass measuring device, ceases, an inert gas (e.g. nitrogen) is supplied to the mixer to a pressure of 180-190 mm Hg. The expiration of the fuel mass lasts 120-140 minutes Then the pressure in the mixer is increased to 380-390 mm Hg, free flow resumes. This is repeated 3 times, until the housing is completely filled with fuel mass, which is recorded by pressure sensors installed on the channel-forming equipment, and atmospheric pressure in the mixer is reached. After the housing is completely filled with fuel mass, the charge is held for 2 hours at atmospheric pressure in the mixer.

Thus, the proposed method of manufacturing SRTT is easily implemented on existing standard equipment and has been repeatedly tested in the manufacture of serial large-sized products.

Claims (1)

A method of manufacturing large-sized charges of mixed solid rocket propellant by free casting, including preparing and draining the fuel mass into a charge body assembled with channel-forming equipment, characterized in that at the final stage of discharge, after the free flow of the fuel mass ends in the body, determined by the readings, the mixer filled with an inert gas at a pressure that ensures the outflow of fuel mass into the housing, periodically increasing the pressure as it expires fuel mass until the housing is completely filled, which is recorded by pressure sensors located on the channel-forming equipment, followed by charge exposure at atmospheric pressure in the mixer.