DE1578097A1 - Sleeve-shaped projectile guide tape - Google Patents

Description

DR. MOLLER-BORi DIPL.-ING. GRALFS DIPL.-PHYS. DR. MANITZ DIPL.-CHEM. DR. DEUFEL

PATENT LAWYERS

August 21, 1969 P 15 78 097.9-15 Mak / Sch - O 860

New description

HENEY CRCBSLEY (PACKINGS) LIMITED, Hill Mill, Astley Bridge, Bolton, Lancashire, England

Sleeve-shaped bullet guide band

The invention relates to a sleeve-shaped projectile guide band and a method for its production.

In the case of artillery weapons, such as cannons, rifles, mortars and the like, the accuracy of the target is determined by the different shooting distances are very important Rotation or twist of the projectile supported. The spin transfer to the projectile is, as is known, through Equipping the gun barrel with grooves or helical grooves carried out, the angle of incline is a pre-calculated factor related to ballistic promotion. For working with The bullet is firmly secured to the running grooves or grooves, for example by forging, a narrow one metallic stay-on, most common guide tape made of copper.

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Under the firing blow of the propellant charge, that becomes Projectile propelled forward in the gun barrel, the copper tape engaged with the barrel grooves or grooves, a mirror image of which is cut into the copper tape. The engagement of the tape in the grooves or grooves ensures that the projectile during its passage through the barrel bore a rotating or is subjected to drilling motion so that the projectile rotates about its longitudinal axis when it emerges from the muzzle of the weapon.

Stay-on copper guide bands or rings that remain on the projectile suffer from a number of poor properties, including the fact that copper is a material that could suffer from a lack of supply, it is mechanically difficult to attach copper to a projectile in such a way that 100 % Torque is transmitted, that carefully elaborated test procedures are required, and that machining operations are generally required after the copper guide band has been attached to the projectile; Furthermore, due to the centrifugal effect, there is a limitation of the twist that can be achieved with such a metallic guide band consisting of one piece.

task

Initially, the invention is the creation of a non-metallic or largely non-metallic sleeve-shaped guide band that is thrown off or repelled and dissolved at the hound and is therefore quite different from the stay-on version that remains on the projectile. The new type of guide band, which is described below as a guide band of the drop-off type, does not have any of the disadvantages selected above and will nevertheless give the projectile the ballistically desired twist requirement.

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According to the invention, a sleeve-shaped Bullet guide tape in that the tape is a discard tape and made of layered strips of fiber material consists, and that the layered strips are arranged in the longitudinal direction with radially extending planes and are connected to each other by impregnation with a thermosetting synthetic resin material.

Woven asbestos cloth is preferably used as the fibrous material, although woven cotton cloth is also used can be. The cloth or fabric is preferably chosen so that it has a low water absorbency and it is even possible to use jute or hops or even glass fabric as the fiber material.

To create such a guide tape for relatively large gun barrel bores, it can be advantageous be, a comparatively small proportion of metallic fibers, for example made of copper, the association of fibrous Add material.

The thermosetting synthetic resin is preferably selected from the phenol resin group. The preferred material is cresol formaldehyde; Eheno! Formaldehyde is another example a thermosetting resin that can be used.

Preferably, the guide tape contains a historical

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th structure added indifferent / filler) for example an ebonite solution can be used to give strength to both the guide band while it is in the Barrel moved forward, as well as the dismantling or cracking after the launch, if the projectile supports emerges from the mouth. The dismantling is important in the guide tape according to the invention Ebonite helps to create the layers through the synthetic resin

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divided strength of the connection decrease. As another example of the filler, P.T.F.E. (Polytetrafluoroethylene) powder be provided between the layers to facilitate the disassembly of the leader tape increase and help reduce barrel wear p.

An advantageous embodiment of a method for Production of a projectile guide tape according to the invention is characterized in that strips of fiber material are impregnated with a thermosetting resin, that the strips are then dipped in an inert filler are, as a result of which their weight is increased, that thereupon a number of the strips so treated are superimposed and by pressing without fully curing the thermosetting resin to form a layer structure is connected to each other that the layer structure is divided into narrow wedges that these wedges into one circular die are inserted in such a way that the strips are arranged in the longitudinal direction and their planes are radial with respect to the longitudinal axis of the belt, and that heat and pressure are applied to the die, around the wedges to connect to one another to produce a rigid, sleeve-shaped layer-shaped piece.

The increase in the weight of the fiber material after the soaking is preferably 30 + 5% and after the immersion treatment 25% +. 10%, so that the total increase in weight from the starting fiber material to the finished soaked and dipped fiber material is 60 % ± 10 % .

The invention is illustrated below with reference to the drawing, for example described; in this shows:

Fig. 1 is a sectional view of the tape along the line I-I of Fig. 2, and

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Pig. Figure 2 is an end view of the rear part of the belt.

According to the drawing, the guide band has a sleeve-shaped, layered structure made of woven asbestos cloth that is impregnated with cresol formaldehyde and has an inert Contains filler in the form of an ebonite solution, the structure being formed by a number of wedge-shaped parts 5 which consist of a plurality of layers 6, the planes of which correspond to the representation in FIG Fig. 2 run radially, so that in the finished product, the band 1 has a portion 2, the outside tapers inwards and outwards. The taper is due to the shape of the various wedge-shaped parts 5 to form efa.es uniform Construction. The lower end of the tape is provided on the inside with a screw thread 3, which has an external thread engages which is provided on the projectile end. The wedge shape of the upper end of the leader tape is formed so that a friction fit with the exterior of the lower end of the storey. Holes 4 are provided in the ring-shaped base of the guide band, which allow the use of a tool to secure or attach the leader tape to the projectile.

The process for producing such a dropping guide tape consists in soaking a length of asbestos cloth with cresol formaldehyde and then immersing this length in an ebonite solution. A useful increase in weight of the cloth would be after soaking of 30% + 5%, and after the dipping treatment, a desired increase in weight of 25% + 10% would be to provide a total increase in weight of 60% _ + 10% from the Ausgangetuch to the finished, impregnated and dipped cloth.

The length of the cloth is then cut into suitable strips,

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for example 330 mm (13 ⁿ ) long and 63.5 mm (2 1/2 ") wide. It will be understood that instead of starting with a length of cloth, the cloth could be treated as before, but is already strip-shaped. A number of these Strips are then placed one on top of the other in a suitable mold to form a multi-layered cloth, preferably six layers are used

under a pressure of 157.5 kg / cm (1 ton per sq.inch), so that the product looks like a blackboard at this stage, but without completed treatment or curing of the thermosetting resin.

The layered sheet so formed is then formed into narrow wedges, for example by a cutting or punching process. The wedges are placed in a circular die or mold so that the planes of the layers are arranged radially with respect to the longitudinal axis of the die and thus a plurality of layers is obtained, the planes of which are arranged radially. Pressure and heat are then applied to the mold, the temperature preferably 160 ^° O (320 ^° F) and the bridge about 472.5 kg / cm (3 tons per sq. Inch) in order to facilitate the creation of a solid tubular shape to connect with each other.

An example of a cresol-formaldehyde resin that is preferably used has the following composition:

Cellobond (registered trademark) J 4940/85, which is supplied as an 85 # solution in methylated industrial alcohol is, is preferably further diluted and weakened to a 50 # solution (in percent by weight), to improve the soaking effect.

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For example, the following solution is preferred for the ebonite solution:

Hycar 104-1 50.0%

Vulcarfor BA (butyraldehyde /

Aniline complex) 1.0%

ZnO - 2.5 %

slightly burnt magnesia 2.0%

red iron oxide 1715%

Dibutyl phthalate 7.0 %

P.33 soot 2.5 %

MC sulfur 17.5 %

100.0 %

This is then processed into a 20% solution, adding 4.536 kg (10 lbs.) of which to 15.9 1 (3 1/2 gal.) Toluene and added to 3.4 liters (3/4 gal.) Dichlorethylene to prepare an immersion solution.

Up to 15 % of a fine PTPE (polytetrafluoroethylene) powder, such as ICI-Fluon, grade L.169, can be added to the ebonite mixture before it is dissolved. The lubricating properties of the PTFE powder also help to reduce barrel wear.

As mentioned earlier, P.T.F.E. also used for this to cause increased or better disassembly of the leader tape when the projectile is fired. The wedge parts are preferably slightly warmed in these circumstances and converted into a P.T.F.E. powder immersed; alternatively, the soaked strips can be coated with P.T.F.E. be coated before the union of the Strips into a layered product.

It can be seen that with such an ejection guide belt, when the wedge-shaped layer parts when inserting

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are arranged close to each other in the round die, a torque transmission takes place during the molding process from one to the next layer part and due to the close proximity or close contact with the parts of the layer relative movement takes place. The torque transmission continues, of course, right around the tape in the gun barrel, with the result that there is always one behind Layer part pushes the one in front, thus avoiding the collapse of the structure, so that no slippage between the outer diameter of the guide band and the rifling in the bore of the gun barrel or the inside diameter of the tape and the groove on the projectile.

The use of the non-metallic discarding guide tapes of the present invention includes the following Advantages:

a) Very good moisture-proof properties;

b) the ability to withstand high gun temperatures at relatively high aiming heights when the projectile is in the barrel;

c) good dismantling and / or shattering properties, since the guide tape is in proportion after the weapon has been fired small fragments disintegrate, for example such that they are only slightly superficial to wounding have as a consequence; it also supports the arrangement of the bores in the base of the guide band the disassembly due to the resulting areas of reduced strength of the tape at the bores;

d) the creation of a better aerodynamic shape for the projectile after dismantling the guide band in comparison with the bullet shape that uses stay-on guide bands and accordingly better accuracy ;

e) simple test procedures result in less costly manufacturing. nqfift ^< i / nQö7

0U9883 / 0387. Claims -

Claims (10)

DR. MDLLER-BORi DIPL-ING. GRALFS DlPL-PHYS. DR. MANITZ DIPL-CHEM. DR. DEUFEL PATENT LAWYERS P 15 78 O97.9-I5 August 21, 1969 Henry Crossley (Packings) Ltd. Kak / Sch - G 860 New patent claims Λ) sleeve-shaped bullet guiding band, characterized in that the band (1) is a Abwerf band and consists of laminated strips (6) of fibrous material, and in that the laminated strips arranged in the longitudinal direction with radially extending planes and connected together by impregnation with a thermosetting resin material are connected. 2. Projectile guide band according to claim 1, characterized in that the fiber material consists either of woven asbestos cloth, woven cotton cloth, jute, plucking or glass fabric. 3. projectile guide band according to claim 1 or 2, characterized in that a comparatively small proportion of metallic fibers is added to the fiber material. 4 bullet guide band according to one of the preceding claims, characterized in that the thermosetting resin material is selected from the phenolic resin group is. 5. projectile guide tape according to claim 4 ·, characterized in that the thermosetting synthetic resin material of cresol formaldehyde or phenol formaldehyde does best. 009883/0387 AO 6. Projectile guide band according to one of the preceding claims, characterized in that an inert filler is present in the strip (6) is. 7. projectile guide band according to claim 6, characterized in that the filler either is an ebonite solution or polytetrafluoroethylene. 8. Projectile guide band according to one of the preceding claims, characterized in that the tape (1) consists of a number of layered wedge-shaped Divide (5) consists of the one after the tape. inward tapering outward and one outward give directional taper inside. 9. A method of making a projectile leader tape of the drop or snap type of one or more of the preceding claims, characterized in that strips (6) made of fiber material are impregnated with a thermosetting resin, that the strips are then dipped in an inert filler are, whereby their weight is increased, that thereupon a number of the treated strips (6) are superimposed and by pressing without fully curing the thermosetting resin to form a layer structure is connected to each other that the layer structure is divided into narrow wedges (5) that these wedges in a circular die are inserted in such a way that the strips are arranged in the longitudinal direction and their Planes run radially with respect to the longitudinal axis of the belt, and that heat and pressure are applied to the die be to the wedges (i?) to produce a rigid, to connect sleeve-shaped layer-fitting together. 0096 8 3/0387 y- 10. The method according to claim 9, characterized in that the increase in the weight of the fiber material after the impregnation 30 _ + 5% and after the immersion treatment 25 % +. Is 10 % , and that the total increase in weight from the starting fiber material to the finished soaked and dipped laser material is 60 % ± 10 % . 0098 8 3/0387 Blank page