GB2239694A

GB2239694A - Tandem armour piercing hollow charge

Info

Publication number: GB2239694A
Application number: GB7911728A
Authority: GB
Inventors: Benjamin Furch
Original assignee: Rheinmetall GmbH
Current assignee: Rheinmetall Industrie AG
Priority date: 1978-04-17
Filing date: 1979-04-04
Publication date: 1991-07-10
Anticipated expiration: 1999-04-04
Also published as: FR2659138A1; GB2239694B; DE2816528C1

Abstract

A tandem hollow-charge for armour piercing purpose has a casing (8) housing a foremost hollow-charge 9, with conical liner 10, a rearmost hollow-charge 2 with liner 3 and transmission charge 13 with insert body 5 therebetween. The construction allows the time sequences between the front and rear hollow-charge detonation to be accurately controlled for best effect. The insert 5 is shaped according to the action required and serves to protect the end face 7'' of the charge 9. <IMAGE>

Description

TITLE Tandem armour piercing hollou-charge.

This invention relates to Z tandem armour piercing hollou-charge.

A thandem hollou-charge is known from United States Patent 3750582. When the projectile carrying s@ms impacte a target the rear charge acts first and a spike formed from the liner and loving ahead or a pentrator alse formed from the liner pases through the for@most hollou-charge via a passage provided for the purposs in the apex zone or the liner or the foremost charge0 A a@parating plate provided on the rear surface of the front charge. which surface races the rear charge.

has a number of perforations surrounding a central passage and creates an chatacle to the penetrator lagging behind the spike and or a lower velocity. As soon as the penatrator reachse the region of the separating plate a shock wave is formed which datenates the front charge through the performations.

To produce an accurate spike from the liner or the front hollow-charge it is necessary to ignite @ame in n strictly defined usy. As the ignition is very largely dependant on the geomstrical conformation of the antire system, even vary alicht irroqularities, for exemple in the arrangement and formation of the perforations in the @eparating plate or in the panetrator, can @erioualy detract fro. the effectiveness of the front hollow-charge.

This invention @@@ks to provide a tandes hollowcharge in which a lore definable ignition of the front charge occurs.

According to this invention there is provided a tandes ermour piercing hollow-charge with the ap@x of the for@moat hollow-charge having a passage through which a spiks formed by the liner of the rearmost hollowcharge may paes, the rear charge being axially spaced fro. the front charge and being detonated first, the front charge being detonated by transmission of the detonation of the rear charge, a tranamiseion charge being located between the front and rear charges.

An embodiment according to the invention is shown in the accompanying drawinge, as exemple.

In the drawing a tandem hollow-charge in shown schematically in the form of a section elong the cantral longitudinal axis of the projectile.

A projectile body comprising a casing 14, only partly shown, has s tandem hollow-charge with a rear.

most hollow-charge 1 and a for@most hollow-charge 8 situated in defined spaced relationship from the front charge in an axial direction. An axis A incorportes the central longitudinal axis @@ the projectile end ferns also the axis of rotational zy@etry of the hollow-charges.The rear hollow-charge 1 comprises an explosive substance 2 surrounding liner 3, n detonator 12 and an inert mase IS. The charge has c front bowndary 1' which forms a rear boundary for a transmission charge 4 of annular cross section (annular charge) ana for an inert body 5, which extends in an axial direction as far as thefront hollow-charge 8 and is in contact with the latter through a rear boundary 8'.

An explosive substance 9 in the front hollow-charge 8 is provided on the inside with r rotationally sy@mstrical liner 10 of which the apes at the boundary 8' is provided with a passage 11. The tranamission charge 4 abuts by an annular rear and zurface 4', at the boundary 1', against an annular end @urface 2' of the explosive sub.

stance 2 of the rear hollow-charge and by an annular front and zurface 4'', at the boundary 8', an ignition zone R-r against an annular and @urface 9' of the explosive substance 9 of the front hollow-charge 8.

R denotes the maximum radial extension ot the expbsive substance 9 and liner 10, while r is the maximum radial extansion of the inert body 5 at the front end surface 7''. A rear end zone of the insert 5 with an internal surface 7 lies on a circls 7'. Along the axis A, therefors, the wall thicknese of the inert bouy 5 undergoes a constant and lin@er incr@as@ from a theoretical value of zero in the zone of the boundary 1' to the value r in the zone of the boun@ary 8'.

When a projectile @quipped with the tandem hollowcharge impacts a target a detonstor fir@@ the initistor 12, which sets up the detonation of the explosive substance 2 of the rear hollow-charge t in a known manner.

A apike formed from the liner 3 firat passes along the axis A through the space bounded by the internal surface 7 of the inert body 5 and after passing through the passage 11, continues through the space bounded by the insert 10 of the front hollow-charge 1. The explosive substance 9 and the insert 10 of the front hollow-charge 1 are in each case protected at their end faces, by being complately covered in the zone of the boundary 8' from contact with particles which may be deflected from the axis A. As a@on as the shock wave in the expl@sive substance 2 has propagated along the axis A as for as the boundary 1', the tranamission charge 4 is detonated from the front end surface 2' and the end surface 4' abutting @ame. On the arrival of the tran@mission shock wave in the zone of the boundary 8' it datonates the explosive substance 9 of the front hollou charge S, by the front ond surface 4'' in the ignition zone Rer of the end surface 9', ac that the hollow-charge can take effect in the intanded manner and without being imp@dad.

As th@ss surfaces of the tran@mission charge 4 and inert body 5 which race towards one another and which are not shown in detail, US in close contact with one another in a zone 6, accurate guiding of the tran@mission shock wave ensures that the ignition of the front hollow.

charge 8 will be strictly defined spatially. An ignition sequence strictly defined from the point of viau of time is then advantageously ensured by the selection of the axplosive substance 13 of the transmission charge 4.By this means and/or by the radial axt@nsion (wall thicknes) of the tran@mission charge 4, with a resulting change in thr ignition zone R-r, the intensity of the ignition of the front hollow-charge can likewise be accurately preselacted in a simple manner. Further@ore, the construction ot the internal surface 7 or the inert body 5, by the adoption, ?or the wall thickness of the inert body 5, of a rate of change which diff@rs from the constant linear rate shown, the effect along the axis A in the interior of the tandem hollow-charge can be influenced in various ways.

From the foregoing details it say be seen that the double hollow-charge according to the invention anables the dissdvantages mentioned at the beginning to be avoided, but also otters the advantage ofenabling the @@parate processes interacting for the optimus over-all aff@ct to be varied within wide limits. The present hollow-charge can thus b@ adapted, by @imple and inexpensive means, both to the armour target. and to the particular purpose for which the projectile ia to be used.

Claims

CLAIPIS

1. Tends. armour piercing hollow-charge with the apex or the for@most hollow-charge having s passage through which a spike formed by the liner of the rear- lost hollow-charge esy pass, the rear charge being axially spaced @rom the front charge and being detonated first, the front charge being detonated by transmission of the detonation of the rear charge1 a tran@mission charge being located between the front and rear charges.

2. A charge in accordance with Clai. 1, wherein an inert body is associated with the transmission charge.

3. A charge in accordance with Clal. I or 2, wherein the transmission charge is of annular form of pr@defined length and thickness.

4. A charge in accordance uith any preceding dais, wherein the transmiesion charge extends between a front boundary of the rear charge and a rear boundary of the front charge.

5. A charge in accordance with any prec@ding claim, wherein the inert body is rotationally symmatrical and of predefined length and thickness.

6. A charge in accordance with any one of Claims 2 to 5, wherein thr inert body extande between the front boundary or the rear charge and rear boundary of the front charge.

7. A charge in accordance with Claim 5 or 6, wherein the wall thickness of the inert body changes in an axial direction.

8. A charge in accordance with any preceding Claim, wherein the transmission charge is cylindrical0

9. 1 A tandem hollow-charge constructed and arranged to function substantially as herein described with reference to and as shown in the accompanying drawings.

8. A charge in accordance with Claim 7, wherein the rats of change of the wall thickness of the inert bady is constant.

9, A charge in accordance with Claim 7 or S, wherein the wall thickness of the inert body increases fros the rear to the front.

10. A charge in accordance with Claim 8 or 9, wherein the constant change in the well thickness of the inert body is linear.

11. A charge in accordance with any ons of the preceding claims, wher@in the two hollow-charges and the transmission charge differ in detonation velocity of the explosive substances.

12. A tandem hollow-charge constructed and arranged to function substantially as herein described with reference to and as shown in the accompanying drawing@.

Amendments to the claims have been filed as follows

1. A tandem armour piercing hollow-charge with an opening in the foremost hollow-charge defining a passage through which a spike formed by a liner of the rearmost hollow charge may pass, the rear charge being axially spaced from the front charge and including a detonator, the front charge being coupled by a transmission charge of annular shape with the rear charge and detonated through the transmission charge by the rear charge, a rotationally symmetrical insert of inert material of annular shape being positioned around the inner surface of the transmission charge, the transmission charge extending between a front boundary face of the rear charge and a rear boundary face of the front charge, said faces lying in parallel planes and at right angles to the longitudinal axis through the charge and further being covered over the entire face surfaces by said insert and/or transmission charge.

2. A charge in accordance with Claim 1, wherein the insert extends between the front boundary face of the rear charge and rear boundary face of the front charge.

3. A charge in accordance with either preceding Claim, wherein the wall thickness of the insert changes in an axial direction.

4. A charge in accordance with Claim 3, wherein the rate of change of the wall thickness of the insert is constant.

5. A charge in accordance with Claim 3 or 4, wherein the wall thickness of the insert increases from the rear end to the front end.

3 6. A charge in accordance with Claim # or #, wherein the constant change in the wall thickness of the insert is linear.

7AN A charge in accordance with any one of the

preceding Claims, wherein the/explosive substances of the

two hollow-charges;and the transmission charge differ.