RU2447309C1 - Method for armouring of ballistite solid propellant charge by edge shields - Google Patents

Abstract

FIELD: power industry.

SUBSTANCE: for armouring of ballistite solid propellant charge with edge two-layered shields inner and outer armouring layers are manufactured and joined with each other and explosive cartridge. Armouring layers joining edge surface of explosive cartridge are made of armouring material based on thermoplastic elastomer with thickness of 1.0…1.5 mm plasticised by indene coumarone resins while outer layers are made of electric-grade cardboard. Inner and outer armouring layers of edge shields are cut of material, glued together by gluing compound and assembled into a pack. Blanks of two-layered armouring shields are underplayed by polyethylene packing, placed into tension strips and cured under pressure of 4…6 kgf/cm² for 1 hour at least; then they are dried 24 hours minimum at temperature of 15…35°C. Assembled packs of two-layered armouring blanks are lathed to outside diameter of solid fuel explosive cartridge. Obtained edge armouring shields are fixed from thermoplastic side to edge surface of explosive cartridge by gluing compound with compression to cartridge edge in strips at pressure of 4…6 kgf/cm² and temperature of 15…35°C during 4 hours at least; further they are dried for at least 18 hours at temperature of 15…35°C.

EFFECT: invention allows improvement of efficiency and capability of solid propellant charges.

2 cl, 3 dwg

Description

The invention relates to a method for booking a charge of ballistic solid rocket fuel (BTRT) with end-face reservations and can be used in the manufacture of a charge for various rocket systems (rocket engines of solid fuel (RTTT), gas generators (GT), ejection devices (KU), separation systems for rocket stages , powder pressure accumulators, etc.).

Known methods of booking the ends of the TRT checkers of charges in various ways: by free pouring the armor on acrylate, epoxy and other substrates into the forming equipment with the BTRT checker installed in it, by booking on a molding machine (TPA) with the BTRT checker placed in the mold, by gluing in advance prepared end-face reservations to the ends of the BTRT checkers with the use of adhesives and accessories for pressing and holding under pressure the glued surfaces, etc. Methods for the free pouring of armor and armor on the TPA, in relation to the reservation of the ends of the TRT charge checkers, are mainly limited by the possibility of applying only one layer of the front armor coating and requires rather complicated technological equipment and equipment (TPA, molds, casting molds, polymerization chambers, etc.).

At the same time, for some types of missiles (primarily guided missiles), it is necessary to provide a two-layer reservation of the ends of the charge with various armor materials, for example, according to US Pat. RU 2211352.

In this case, use high-tech reservation methods at TPA, US Pat. RU 2209135, RU 2232074, or free pouring, US Pat. RU 2215721, it is not possible, which is a disadvantage of the known methods.

There is also a method of booking the end surfaces of the charge in the framework of US Pat. RU 2211352.

According to the said patent, the end surfaces of the checkers (3) of the BTRT (Fig. 1) are fastened with nitrolinoleum (2), which, in turn, is glued with an asbolavsan sticker (1), which provides additional thermal protection of the nitrolinoleum with damping of axial overloads, which are charged during operation and combat application. The method of booking charge BTRT, set forth in US Pat. RU 2211352, IPC F02K 9/18, declared 05/22/2002, publ. August 27, 2003, adopted by the authors as a prototype.

The disadvantages of the prototype are:

1. The use as an external armored layer of an end armor made of asbolavsan fabric, which worsens the environmental situation in industrial premises in the manufacture of BTRT charges.

2. The use for the inner armored layer of the end-face armor of nitrolinoleum, into which the nitroether (NE) BTRT actively migrates (nitroglycerin and other NEs for ballistic-based TRT), which reduces ballistic characteristics by 3 ... 5% or more (for short charges) ( VBH) of the charge, primarily the total impulse of the solid propellant propulsion thrust during operation (service life).

The objective of the invention is to develop a method for booking the charge of BTRT with end-layer two-layer bookings with a minimum reduction in VBH during the service life of the charge, primarily the total impulse of thrust.

To solve this problem, a method is proposed for booking a ballistic solid rocket fuel charge with end-face two-layer bookings, which includes making the inner and outer armor layers of the end armors and fastening them together and with the ends of the charge checkers, in which, unlike the prototype, the armor plates adjacent to the end surface of the checkers perform from armored material based on thermoplastic elastomer with a thickness of 1.0 ... 1.5 mm, plasticized by indencumarone resin, and the outer armored material from armored material with high damping with a rolling ability - an electric cardboard, while the inner and outer armored end-face armors are cut from the fabric of material, fastened together with an adhesive composition, assembled into a cassette, while the end blanks of two-layer armor are laid with polyethylene gaskets, the blanks of two-layer armor with polyethylene gaskets are placed in screeds, placed at a pressure of P = 4 ... 6 kgf / cm ^{2 for} at least 1 hour, then dried for at least 24 hours at T = 15 ... 35 ° C, after which the billet end blanks assembled in a cassette are grinded reservations on the outer diameter to the size of the outer diameter of the solid fuel checkers, and the resulting end-bookings are fastened on the thermoplastic elastomer side with the end surface of the solid fuel checkers with an adhesive composition with compression to the end of the checkers in screeds at a pressure of P = 4 ... 6 kgf / cm ² at T = 15 ... 35 ° C for at least 4 hours, then dried for at least 18 hours at T = 15 ... 35 ° C.

The adhesive composition can be made on the basis of styrene-butadiene thermoplastic elastomer.

The technical result of the invention is to create a method for booking the charge of BTRT end-face double-layer bookings (Fig. 2). In this case, a fabric is made of an armored composition based on thermoplastic elastomer (TEP) and indencumarone resin (IKS) and blanks of the required size are made (cut). GOST 2824-86 prepares (cuts) blanks from sheet electric cardboard that are close in size to the end reservation. Armored blanks based on TEP and electrical cardboard are fastened together in screeds (Fig. 3) by an adhesive composition based on TEC, plasticized IKS, for which several pairs of blanks of electrical cardboard and TEP are assembled into a cassette, while the pairs of "electrical cardboard-TEP" are separated by polyethylene gaskets, preload the workpieces in the screeds at a pressure of P = 4 ... 6 kgf / cm ² and a temperature of 15 ... 35 ° C for at least 1 hour, followed by drying at a temperature of 15 ... 35 ° C for at least 24 hours. Then, the end-face bookings blanks assembled into the cartridge are machined to the diameter of the armored charge. The obtained 2-layer reservations are fastened, on the TEP side, with the end face of the solid fuel checker, while previously, on the surface of the TEP-based armored composition, an adhesive composition based on the TEP and IKS is applied, and fastening with the end face of the checker is carried out at a pressure: checker end face BTRT-end reservation P = 4 ... 6 kgf / cm ² at a temperature of 15 ... 35 ° C for at least 4 hours, and then dried at the same temperature for 18 hours. In this case, an adhesive composition based on thermoplastic elastomer and indencumaronic resin is used, for example, of the following composition (wt.%):

styrene butadiene thermoplastic elastomer 21.0 ÷ 24.0 indencumarone resin 9.0 ÷ 13.0 chlorinated polyvinyl chloride resin 1,5 ÷ 5,0 rosin 1,5 ÷ 5,0 ethyl acetate 24.0 ÷ 29.0 butyl acetate 28.0 ÷ 29.5 nefras 1,5 ÷ 5,0

The invention is illustrated in figure 1-figure 3.

FIG. 1. Booking method (prototype)

1 - asbolansan sticker

2 - nitrolinolium

3 - checker BTRT

Fig 2. The technological scheme of booking patented method

Fig 3. Scheme of fastening of end reservations in screeds

4 - couplers

5 - polyethylene gaskets

6 - electrocardboard

7 - TEP

P - preload force

The essence of the invention is to increase the efficiency and efficiency of charges of BTRT due to the exclusion from a two-layer reservation (prototype) of nitro-linoleum and asbolavsan fabric and replacing them with armored materials based on TEP and electric cardboard, respectively. At the same time, the technological pressure when gluing (preloading) the end reservation with the end face of the checker (and the inner armored layer with the outer armored layer) is provided at least 4 kgf / cm ² , because at lower pressure local non-sticking of surfaces is possible, and at a pressure of more than 6 kgf / cm ² - unacceptable changes in the geometric dimensions (deformation) of glued materials. In this case, the gluing process is carried out at temperature conditions of 15 ... 35 ° C adopted in the BTRT industry (production), ensuring that the glued surfaces are exposed to the specified pressure for at least 4 hours when gluing a two-layer armor to the end of the checkerboard, and for at least 1 hour when bonding two layers of armor. With a shorter exposure time under pressure, a satisfactory quality bonding of the end surfaces of the checker and the end reservation, in the first case, or the layers of the reservation between themselves, in the second case, is not achieved.

An example of the practical implementation of the patented method.

Reservation in a patented way was subjected to BTRT drafts with dimensions:

- outer diameter of the checker - 33 mm;

- the diameter of the channel checkers - 8 mm;

- checker length - 160 mm;

- mass of checkers - 0.2 kg.

Reservation of drafts was carried out in compliance with the technological regimes of the patented method. Armored checkers were equipped with a charge of 14 pcs. and were subjected to fire bench tests and full-scale tests as part of the KU rocket engine to the emergency rescue system for pilots.

The test results are positive.

Claims (2)

1. The method of booking the charge of ballistic solid rocket fuel with end-two-layer armor, including the manufacture of internal and external armored end-face armor and fastening them together and with the ends of the charge checkers, characterized in that the armor plate adjacent to the end surface of the checkers is made of armored material based on thermoplastic elastomer thick 1,0 ... 1,5 mm, plasticized by indencumarone resin, and the outer armored layer - from armored material with high damping ability of the electric cardboard, while inside the front and external armored end armor plates are cut from the material web, fastened together with an adhesive composition, assembled into a cassette, while the end blanks of the double-layer armor are laid with polyethylene gaskets, the blanks of the double-layer armor with polyethylene gaskets are placed in the screeds, kept under pressure P = 4 ... 6 kgf / cm ² is not less than 1 hour, then dried for at least 24 hours at T = 15 ... 35 ° C, and then collected in the cassette grind workpiece end bilayer bookings OD in outer size d ametra solid-checkers, and the resulting end bookings bonded by a thermoplastic elastomer with an end surface of a solid-checkers adhesive composition with a preload to the end pieces to the screed at a pressure P = 4 ... 6 kgf / cm ² at T = 15 ... 35 ° C for at least 4 h, then dried for at least 18 hours at T = 15 ... 35 ° C. 2. The method of booking a charge of solid rocket fuel according to claim 1, characterized in that the adhesive composition is made on the basis of styrene-butadiene thermoplastic elastomer.

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