FR2628196A1 - CONCORDANCE BONDING DEVICE FOR FORM BETWEEN A PENETRATEUR OF THE ARROW TYPE AND A SHOE - Google Patents

Abstract

The technical sector of the invention is that of devices for connection by mutually engaging shapes between an arrow-type penetrator and a sabot consisting of a plurality of segments. The sabot (2) and the penetrator (1) being positioned relative to one another by means of a stop (6), the connection device according to the invention comprises a first profile (7) carried by the penetrator and a second profile (8) carried by the sabot and is characterised in that there is a relative axial play (J) between the first and the second profile, the total value of which is calculated so as to allow differential expansions of the sabot and penetrator which are attributable to temperature gradients. The invention is used for arrow-type artillery ammunition.

Description

() FRENCH REPUBLIC Publication No. 2,628,196 (to be used only

  for INSTITUTE NATIONAL Reproduction Orders)

BE THE INDUSTRIAL PROPERTY

  OF INDUSTRIAL PROPERTY National Registration Number: 88 02681 PARIS

  Int Cl4: F42 B 13/16.

@ APPLICATION FOR PATENT OF INVENTION A1

  Date of deposit: 3 March 1988. (Applicant (s): FRENCH STATE, represented by the

  bequeathed General for Armament - FR.

  (g) Priority: Inventor (s): François Beauvais; Louis Bonnefille;

Jean-Claude Sauvestre.

  Date of the public availability of the

  BOPI application "Patents" No. 36 of 8 September 1989.

  References to other national documents appearing

  RtQ Holder (s): Agent (s): Office of Patents and Inventions of the

  General Delegation for Armaments DPAG.

  A shape matching device between an arrow type indenter and a shoe.

  (5) The technical field of the invention is that of the form-fitting connection devices between an arrow-type penetrator 9 / 1a and a shoe consisting of several sectors. The shoe 2 and the indenter 1 being positioned relative to one another by means of a stop 6. the connecting device according to the invention comprises a first profile 7 carried by the indenter and a second profile 8 carried by the shoe, it is characterized in that there is a relative axial clearance J between the

  first and second profile whose total value is calculated -.

  in order to allow differential expansion of the shoe and the indenter due to thermal gradients. 7

  Application to arrow artillery ammunition ..

  The present invention relates to a form-matching binding device between a web penetrator

arrow and a hoof.

  The field of application of the invention is that of arrow-type arrowheads for artillery ammunition.

  Arrow type Drojectiles. known from

  years. have as main interest to allow to obtain a qrande speed for a sub-calibrated indenter and thus an important terminal efficiency. Such a result

  obtained with the condition of using an indenter in

  heavy material such as tungsten associated with a sabot

  This material is made of a material such as aluminum alloy.

  The launch pad, caliber. entralne the penetration

  during the internal milestones phase, and releases him at the exit of the weapon. It is necessary to define the means of connection between the shoe and the D penetrator. Indeed these

  must be sufficiently resistant to induce penetration

  but should not prevent his release by the

  bot. and they must also ensure accurate positioning

  between the indenter and the hoof, in order to ensure a good

  deliverability of ballistic characteristics.

  We will therefore ask these linkage means

  to maintain, during all phases of transport or storage of the complete ammunition, a relative position between

  the shoe and the indenter has been defined during assembly.

  It is described in US Pat. No. 3,148,472 a plastic shoe completely surrounding the penetrator and

  entralnant by means of annular toothed profiles. Such a

  bot drives the Dnenerator so well that it is difficult to

  provoke the separation of these elements at the exit of the weapon.

  The cited patent thus proposes to dispose of

  be of the weapon, sharp profiles likely to weaken the

  shoe, which then facilitates the separation.

  To improve the process of liberation from Dene-

  trator. hooves made of

  separable sectors, most often three. and we adopt a toothed connection Profile whose forms are -2-

  chosen so as not to disrupt the movement of separat-

  of these sectors under the action of aerodynamic forces

  which are exerted on them at the exit of the weapon. It is equal

  it is necessary to provide for mounting a positioning of the

  natrator relative to the hoof which prevents any movement

  of one relative to the other.

  We obtain this for example. by adopting a connecting means consisting of several annular teeth. the clearance between the teeth of the indenter and their loaement in the hoof being small enough to avoid any movement too much

  extent, or by linking

  taqe. a fixed stop ensuring the final relative position to the

  end of the screwing down of the Déntrateur. This last method is

  particularly interesting from the point of view of manufacture.

  Such solutions already known nevertheless

  less of the disadvantages. Indeed the constraints of the modern combat impose to have munitions keeping all their

  characteristics whatever the weather conditions

  ambient issues. Thus, it is often necessary to ensure the possibility of shooting after stocking of the ammunition

  temperatures from -40 C to +60 C. The differences in

  materials of the shoe and the indenter will then induce linear expansion differences between these

two components.

  In the case of monobloc shoes. the differences of

  dilation will only provoke

  compression or compression at the level of the connecting means, but in the case of hooves made up of several sectors. it was observed that these differences in dilatation induced a separation of the different sectors. This could cause propulsion qaz leaks between the sectors. even to impaling an impossibility of setting ammunition

in the weapon.

  This phenomenon can be explained by the fact raw. the

  pDentrator abutting relative to the hoof. the di-

  latation of the latter entails a cleavage of his teeth on those of the indenter. and therefore a pivoting of each element

  hoof around the fixed point constituted by the stop.

  -3- Such a movement can only be prohibited by making the hoof sectors supportive of each other in a way that is easy to do.

  last at the exit of the tube of the weapon.

  It would also be possible to remove the stopper.

  provided, however, that there is sufficient clearance between the hoof and the penetrator threads. but the vibrations at

  during the storage or handling of the ammunition risk-

  to induce an unscrewing of the Penetrator resulting in a modification of its Position, the risk being all the more

  big cue the relative game is important.

  Finally, a total clearance whose position on either side of each indenter's tooth is poorly defined, Deut be detrimental to a good mechanical behavior of the connecting moven in the case of a use of the tvDype Projectile

  arrow at extreme temperatures.

  The object of the present invention is to propose a

  Positive binding of form-concordance between a Dénétra-

  and a shoe made up of several sectors which

  to ensure operation at extremely low temperatures

  use of a munition while the assembly of

  components is carried out at a moderate temperature.

  To do this, the object of the invention is a form-fitting connection device between an arrow-type penetrator made of heavy material and a shoe made of light material consisting of several sectors. the hoof and the penetrator, components of a munition. being positioned relative to each other by means of an axial abutment. device comprising

  a first profile worn Dar the indenter and a second pro-

  wire carried by the shoe the Drofils having in section

  an axial plane a form of teeth. tooth with tooth

  a first and a second flank and the first flank being

  killed on the stop side, characterized in that in assembled configuration. there is a relative axial clearance between the first and the second profile whose total value. at the temperature of assembly of the Penetrator and the shoe. determined between the tooth of the penetrator furthest from the stop and its corresponding housing in the shoe is at least equal to the product of the distance between the stop and the second flank of the tooth of the elongated penetrator thereof over there

  difference in the coefficients of expansion of the materials con-

  the hoof and the indenter and the maximum value

  the difference between the average temperature and the temperatures

  maximum and minimum storage and use of the muni-

  tion. the distance being measured'the lona of a direction

  Parallel to the axis of the indenter located at the level of the

moveur of the teeth.

  According to a first embodiment, the stop is constituted by a disc integral with the penetrator or shoe

  and made of a material whose compressibility at temperatures

  maximum and minimum tears is such that the effort required to compress this disk is less than that exerted, exerted

  axially on the pEntrateur. would eliminate the differences

  different sectors. the games between the different teeth of the

  and their respective loations in the shoe being

advantageously all equal.

  According to another embodiment, the first and second profiles are such as to show the total value of the medium. at the temperature movenne. between each tooth and its housing in the hoof varies in a linear and increasing way between the stop and the tooth Most elongated of the latter, the abutment Pouvant

  be constituted by a shoulder integral with the indenter.

  The profiles constituting the form-concordance connecting device may be circular or

filetaqes.

  According to a particularly interesting variant embodiment of this second embodiment, the filetaqe pDorté by the Péntrateur is such that the first flanks of the teeth are carried by a first propeller and the second flanks are supported by a second propeller, the footsteps of the two propellers being different. the pitch of the first helix being

  greater than the thread of the shoe which is itself superior

  the second helix.

  Preferentially. the total value of the place. at the temperature movenne. between the tooth of the penetrator The most elongated abutment and its corresponding housing in the -5-

  hoof is at least equal to the product of the distance between

  said dwelling and said dwelling. by the difference of the coefficients of

  dilation of the materials constituting the hoof and the Dpenetra-

  the difference between the maximum and maximum temperatures

minimal.

  The invention will be better understood on reading the

  description of modes of particulars of realization, description

  with reference to the accompanying drawings in the following:

  Figures 1 and 1A are diagrammatic representations

  tiaues of an arrowpen penetrator and his solid hoof

  by a connecting device according to the state of the art. Fiaures 2 and 2A represent a first mode of

  implementation of a linkage device by concordance of

me according to the invention.

  Figures 3, 3A and 3B represent a second model.

  embodiment of a connection device by concordance

form according to the invention.

  Referring to fi gures 1 and 1A. a projectile

  of known arrow is constituted by a D 1

  with a hoof 2. consisting of three sectors 3. 4. 5 des-

  designed to depart from each other at the exit of the weapon under the effect of aerodynamic efforts and thus release the indenter. The shoe and the plenum are made integral with one another by a form-fitting connection device. it consists of a first profile 7 Dormed by the

  Déntrateur and a second Drofil 8 worn Dar the hoof.

  These two profiles shown in section along an axial plane have a tooth shape 9. The flanks of each tooth have an inclination such that the separation of the

  hoof is not disturbed. Different forms of teeth

  They should be adoDated, like trapezoidal teeth. trianqu-

laires or rounds.

  Drowls are here filetaGes, but adents

  Circulars meet ecally.

  In order to ensure the relative positioning of Dpenetra

  and shoe, a stop 6 is provided. Here this stop is

  a shoulder of the nentrator: we realize the montaae in vis-

  the penetrator in the hoof. the three sectors being - 6 secured by belts 12. 13. until contact with the

stop 6 with this one.

  In the case of a profile constituted by circular props. it is the adents themselves that play the role

of the stop.

  The montaae is carried out at a moderate temperature.

  For example of the order of 20 C; it exists between hoof and

  a functional game that allows the screw or

  assembly. the abutment ensuring the correct position.

  The materials have coefficients of dilatation

  different types (25 X 10-6 C-1 for aluminum.

  X 10-6 C-1 for the commonly used tunastene alliaae). So a rise in temperature will cause

  a hoof elongation greater than the penetration elongation

  tor. the flanks of the teeth being inclined relative to the normal to the axis of the indenter. this lengthening will cause the sliding of the teeth of the shoe on those of the Penetrator. this mistletoe will cause the separation of the three sectors constituting it. For exemple. on a sabot of tvope from that of fiqures 1 and 1A. it was measured for a temperature rise of 20 C to 600C. an increase in the diameter of the hoof by about 0.5 mm at the waistband 13.

  the appearance of a game of about 0.5 mm between sectors.

  This increase results in the impossibility of putting the ammunition on post. and the game between sectors orovoaue a defect

qaz waterproofing.

  A simple increase of the functional game between the profile carried by the hoof and that carried by the indenter

  not enough to give satisfaction. Indeed. putting in place

  become impossible and the relative positioning randomly

  re. the vibrations will then cause unscrewing of the indenter. Figure 2 shows. at medium temperature, a first embodiment of the connecting device according to the invention. Profiles 7 and 8 are filetaqes. The abutment 6 is constituted by a washer. integral with the indenter at its rear portion, for example by form matching with the empennage of it. The puck is made

2-628196

  In a material having a certain compressibility. The criteria for choosing and defining this compressibility

are explained below.

  The indenter is mounted at room temperature

  medium screwing until the stop 6 comes into contact with the shoe 2. The final position is that represented on the

  Figure 2. Thus for each tooth of the indenter, if we ap-

  shovel first side 10 that is oriented towards the stop 6, it is in contact with the shoe, while there remains a

  play J between the second flank 11 and the shoe.

  At the average temperature this game J has a value that

  is the same for all teeth and is chosen superiorly

  equal to the product of the distance D between the stop and the second flank of the tooth of the penetrator furthest from

  this one, by the difference (s-1p) of the coefficients of di-

  latation of the materials constituting the shoe and the indenter

  and by the maximum value of the difference between the temperature

  mean re (To) and maximum temperatures (Tmax) or minimum

  the (Tmin) desired for the use of the ammunition.

  We write: J>, D. (Esgp) .MAX {(Tmax-To), (To-Tminj.

  For this determination, the distance D along a direction parallel to the axis of the indenter, for example at the level of the average height of the teeth, is measured.

  being measured also along this same axial direction.

  This theoretical limit value which involves the average temperature of assembly can advantageously be replaced by a limit value involving only the extreme values of the temperature range. We can thus choose a game such as:

JD (ε p) (Tmax-Tmin).

  Similarly, it is possible to determine the limit game

  te, to replace the value D, distance of the abutment to the second side of the penetrator's tooth, by the distance D 'of the abutment

  at the top of the last tooth of the hoof thread, the approximate

  thus neglected the dilations and contractions of a single tooth of the indenter compared to those of all

  threaded parts of the indenter and shoe, which is acceptable

  in most cases, the width of the tooth being of the order

1% of the threaded length.

  Thus, in the case of use at a temperature

  below average temperature, differences in contrac-

  hoof and the indenter will cause a simple

  the total clearance J, with distribution of the latter on each side of each of the teeth of the indenter, a decrease which does not eliminate any interference between the threads up to the value of the minimum temperature chosen, whereas in the case use at a temperature above average temperature differences in expansion will induce an effort of

  compression at the stop 6.

  We choose the material constituting the abutment 6 of such

  that for all temperatures between the time

  medium temperature and the desired maximum temperature, the force required to compress the abutment is less than that which, exerted axially on the penetrator, would separate the various sectors of the shoe by sliding the teeth thereof on those of the indenter. It can thus be seen that this choice depends on the amplitude of the expansion to be absorbed, therefore on the nature of the materials in the presence and the length of the threaded portion, and that it also depends on the profile of the teeth as well as

  of the material constituting the belts 12 and 13.

  For example, with a munition comprising a

  tungsten stirrer associated with an aluminum alloy shoe, the threaded length being 202 mm, and the tooth profile being an ISO profile (equilateral triangle), a low density polyethylene disc whose compressibility is of the order of 850 N / m2 both at 20 ° C and 60 ° C, and cooperating

  with a game of the order of 0.21 mm, gave complete satisfaction.

  Thanks to the invention, the stop 6 no longer plays a fixed point r8ole but it cooperates with the game arranged between the

  indenter and shoe profiles to absorb the dilat-

  differentiation of these two elements.

  With the connection means according to the state of the art, the shoe was supported on the fixed stop and its teeth tended to slide on those of the indenter. With the connecting means according to the invention, the shoe is supported on the tooth of the penetrator farthest from the stop and it compresses the latter. The final result is a new distribution of games that is shown schematically in Figure 2A. There is then a -9 clearance between the first flank 10 of the first tooth and the loaement

of it in the hoof.

  The stopper Dermet ecalement to play the role of brake by preventing the indenter to unscrew. As such. she can

  have a Drofil cooDerant with the surface of the hoof with the-

she comes into contact.

  The abutment 6 can also be integral with the hoof.

  In this case it is disposed at the end of the shoe opposited to that by which the penetrator is introduced to the mount. and a shoulder of the latter comes in contact with it. We notice. in the latter case aue, at the temperature movenne, the Penetrator is in contact with the stop and the game

  is then located between the first flank of the teeth and their loqe-

  in the hoof. Thus, in this particular case, the stop is

  found compressed during contractions of the hoof and Dpenetra-

  that it intervenes for any temperature below the

  medium temperature, dilatations only

of the world.

  The material constituting the abutment is then chosen so that for all temperatures between

  medium temperature and the desired minimum temperature.

  the effort required to compress it is less than that Which, exercised axially on the Dentrator, would make it possible to exclude

different areas of the hoof.

  It is useful to choose, in all cases of ficures.

  a material whose compressibility is such that this effort is always less than that of spacing sectors, and that for all temperatures between the maximum temperature and the minimum temperature. We are thus freed from

  the uncertainty concerning the actual temperature of the montaae.

  FIG. 3 shows, at the average temperature, a second embodiment of the connection device according to the invention. The profiles 7 and 8 are always threads, but the filetaae constituting the first profile 7 is such that the flanks 10 and 11 of each tooth are borne by two different pitch helices. So the first flank 10 located on the side of the

- 10 -

  stop 6. is secured to a first propeller while the

  second flank 11 is carried by a second helix.

  The pitch of the first propeller is greater than the pitch of the net of the shoe, which is itself greater than the Pas de la

second helix.

  The total axial clearance (Javl + Jarl) between the nearest tooth of the stop and its loaement in the hoof is less than the total clearance (JavN + JarN) between the most elongated tooth of the

  stop and its housing. The value of this game varies in a way that

  nee and growing from the nearest tooth to the tooth the

further away from the stop.

  The values of these steps are determined by

  the desired conditions of use and the materials involved.

  In a Pratiaue way. To define the airlock

  lices carried by the indenter. the products of the distance DN are made between the top of the tooth of the hoof the most eloianée of the abutment and the latter, by the difference

  (s-p) coefficients of expansion of the materials constituting

  killing hoof and indenter, and on the one hand the difference (Tmax-To) and on the other hand the difference (To-Tmin) between

* Extreme temperatures of use desired for the ammunition.

  We therefore have the following two products:

P1 = DN. (s-p). (Tmax-To).

P2 = DN (Ss-rp). (To-Tmin).

  The products Ph and P2 respectively give the images of the maximum amplitudes. at the level of the last tooth. dilation and contraction. An approximation

  Is made. identical to that mentioned in the description of the

  first embodiment. mistletoe neqliae the dilatations and

  contractions of a single tooth of the indenter with regard to

  the set of threaded parts of the nentrator and the

  shoe. this mistletoe is acceptable in most cases. the

  tooth area being of the order of 1% of the threaded length.

  The pitch of the first propeller at the temperature

  is then equal to the pitch of the net of the hoof increased by a

coefficient 1 = P1 / N.

- 11 -

  The pitch of the second propeller at the temperature

  is not equal to the Das of the hoof file, decreased by a coefficient

  2 2 = P2 / N. N being the total number of nets.

  This method of calculation leads, after having determined the value of the maximum and minimum amplitudes of differential dilations of the shoe and the indenter. to distribute them at the level of each net tooth of the Penetrator. The pitch of the first propeller is then greater than the pitch of the shoe which is itself greater than the pitch of the second propeller. If, at the level of the tooth of the penetrant closest to the stop. the total game is very weak. this game will crottre linearly iusau'à

  reach its maximum value at the level of the Dpenetra tooth.

  most eloienée of the stop.

  This maximum value is equal to:

P2 + Pl = DN (s-6o). (Tmax-Tmin).

  In reality, the coefficients 1 and e2 must be corrected to take into account the variation of the game between a

  tooth and its loaement depending on the temperature.

  We write, 1 = Pl / (L1 + p. (Tmax-To) J.N) and

2 = P2 / (E1-p. (To-Tmin) J.N).

  But these values are different from the values

  Previous. Given the usual value of the coefficients

  Expansion probes for materials that can be used as an indenter. The fi gures 3A and 3B show the distribution of the different games for the maximum 3A and minimum 3B temperatures. it is noted that, at the maximum temperature, all the first flanks of the teeth of the penetrator are in contact with the shoe. then aue. for the minimum temperature, all the second flanks are in contact with it. For exemple. For a projectile constituted by

  an aluminum alloy shoe rs = 25X10-6 C-1 and a Dpenetra-

  in tunasene alliaae rp = 5X10-6 C-1 the lon-

  the hoof is 196 mm at 200C. the das of the filetaae of the shoe being 2.5 mm, and the number N of threads being 78.36

- 12 -

  for a temperature plate of -40 C to +60 C with a temperature of

  average height of +20 C. the following values are obtained:

  Pi = 0.1568 mm. P2 = 0.2352 mm. (1 = 0.002.

2 = 0.003.

  The pitch of the first propeller is 2.502 and that of the second is 2.497. The maximum value of the game at the level of the tooth of the penetrator is the upper limit of the stop

is then 0.392 mm.

  There was no further interference between the

  teeth of the hoof and those of the Denetrator in the time Dplae.

Temperatures from 40 C to +60 C.

  Thus, in this second exemplary embodiment of the invention, the mode of cooperation of the fixed abutment with the

  Drills of the indenter and the hoof are at the level of the dif-

  the distances between said stop and each of the teeth. the linear and increasing variation of the total game as a function of this distance ensuring the absence of interference

between the Profiles. It is possible ecalement. without so much going out

  within the scope of the invention, Dratiauer had a double

  lice on the hoof and a single filetaae on the Dpenetrator. he

  For this reason, it suffices to transpose the method of calculating the low DRE-

described above.

  It should be noted that when the ammunition is dosed, the pressure of the ProDulsives will be exerted on the shoe which will drive the deviator through the connecting device according to the invention. A major shock will occur at the level of the first hoof tooth that is pinched between the stopper and the first tooth of the penetrator. The game being minimal at the level of these

  First teeth and crescent Droidly the lona of disdo-

  link, the effort will be redistributed

all the teeth of the interface.

  We thus see an appreciable advantage of the second

  embodiment of the invention aui. maintaining the

  calf of the abutment a relative fixed Dune between the shoe and the Dpenetrator, and by making the game in a linear way

2-62628196

  - 13 - ooy total between the two profiles, provides at the first flank a game that is increasing from the stop, which allows to reduce the mechanical stresses exerted

  at the level of the connection device between the shoe and the penetration

  while bringing the benefit of good positioning

determined of these two components.

  It was found that the pressure developed by a propellant charge depended on its temperature of use. So,

  for a conventional nitrocellulose filler, the coeffi-

  of pressure variation as a function of temperature.

  re is of the order of 12 to 15 bar / 0C; therefore for a

  temperature range between -400C and +60 C, the variation

  total temperature is 100 C, which results in a possible total variation of the pressure developed from 1200 to

  1500 bars. Such pressure variations are prejudicially

  good mechanical strength of the connecting device. It is useful then to have, for the maximum values of the pressure, a contact surface at the level of the device of

  link that is also maximal.

  This is made possible by the invention. Indeed-

  fet, with the second embodiment described above, but with arranging.the shoulder constituting the abutment at the level of

  of the back part of the indenter o will exert the pressure

  of the gases, for the maximum operating temperature, all

  first flanks facing the abutment of the teeth of the penetration

  are still in contact with the hoof, but these flanks are then the 'active' flanks on which the efforts will be exerted.

  We are therefore sure to have, for the maximum temperature

  the pressure utilization is also the most important, a maximum contact area between the profile of the

  hoof and that of the indenter. What guarantees the best

  mechanical bare possible for the connecting device.

  It is therefore particularly interesting to apply

  the latter variant to a linking device in

  which profiles are circular adents. We then, in

  to be each tooth of the indenter and its housing in the hoof, a game which, at the average temperature, increases in a linear way

- 14 -

  between the abutment formed by one of the adents and the tooth furthest from the latter. The method of calculating this game is similar to that previously described. The maximum play at the mean temperature is equal to P1 + P2, P1 being the game associated with the first flank of this tooth and P2 that associated with the second flank. The minimum clearances at the mean temperature, at the level of the tooth closest to the stop, are Pl / N and P2 / N, where N

  is the number of teeth, and these games grow linearly

  their extreme values. If we associate the total minimum game

  the adent closest to the rear part of the shoe, this adent constituting the abutment, it ensures a maximum contact surface between the profiles for the temperature

maximum use.

- 15 -

Claims (8)

  1 - Device for connecting form-fit between an arrow depressor arrow (1) of heavy material and a shoe (2) of luer material consisting of several sectors   (3,4.5). the hoof and the indenter. components of a muni-   tion. being positioned relative to one another by means of an axial abutment (6), device comprising a first profile (7) carried by the indenter and a second profile (8) carried by the shoe. the profiles having in section along an axial plane a form of teeth (9). each tooth having a first and a second sidewall and the first sidewall (10) being located   side of the stop (6). characterized in that in configuration as-   sembly. there is an axial relative distance (J) between the first and the second Drofil whose total value. at the temperature   average (To) of assembly of the Dentrator and the hoof. determined   born between the tooth (9) of the most elusive penetrator of the bu-   (6) and its corresponding housing in the shoe is at least equal to the product of the distance (D) between the stop and the second flank (11) of the tooth of the zenator Dlus far from it by the difference of the coefficients of expansion of the materials constituting the shoe and the penetrator and by the maximum value of the difference between the mean temperature and the maximum and minimum temperatures of stockaae and use of the munition, the distance (D) being measured on the lonQ   of a direction parallel to the axis of the indenter at   calf of the average height of the teeth.   2 - DisDositif binding according to claim 1.   characterized in that the stop (6) is constituted by a disc   than the solidarity of the oentrator or hoof and carried out in one   material whose compressibility at maximum and minimum temperatures is such that the effort required to compress this   disc is less than that mistletoe. exerted axially on the   nétrateur (1). Would allow to separate the different sectors (3.4.5).   3 - DisDositif connection according to claim 2.   characterized in that the value of the game (J). at the temperature   movenne (To) between a tooth (9). of the indenter and his loqe-   in the shoe is constant between the stop (6) and the tooth   the farthest from the latter. - 16 -   4 - Connecting device according to one of the claims   1 to 3, characterized in that the value of the clearance (J) at the molten temperature (To) between a tooth (9) and its location in the shoe varies linearly and increasing between   stop (6) and the tooth farthest from the latter.   - Connecting device according to one of claims 1 to 4. characterized in that the profiles (7) and (8) are filetaQes.   6 - Connecting device according to one of the claims   1 to 5. characterized in that the profiles (7) and (8) are circular adents.   7 - Connecting device according to claim 1.   characterized in that the abutment (6) is made of a material whose compressibility at the maximum and minimum temperatures is negligible.   8 - Connecting device according to claim 7.   characterized in that the stop (6) is constituted by a   Radially attached to the pEntrateur (1) and located in the   part of the indenter where the pressure of the propulsive of the ammunition.   9 - Connecting device according to one of the claims   1.2. 4 to 8, characterized in that the filetaqe worn on the penetrator (1) is such that the first flanks (10) of the teeth (9) are borne by a first propeller and the second flanks (11) are borne by a second propeller , the Das two propellers being different.   - Connecting device according to claim 9.   characterized in that the pitch of the first propeller at the temperature   The movable height To is equal to the thread pitch of the jack with a coefficient of 1 aui is: Il: P1 / N o P1 is the product of the distance between the vertex   the hoof tooth of the abutment and this last   the difference in the coefficients of dilatation of the materials   of the hoof and the nentrator and the difference between the maximum temperature and the average temperature To and o N is the total number of nets and in that the pitch of the second helix at the medium temperature. - 17 -   To be eaal to the root of the hoof increased by a coeffiate   t 2 which has value 2 - P2 / No P2 is the product of the dis-   Due to the difference in the expansion coefficients of the materials   the hoof and the indenter and Dar the difference   this is between the average temperature and the minimum temperature. 9 6 Z 6   Cu> 1. 1 5 PL 2 Iff 1o il 9/0 iol 8 7ú Fig 2 11 2 6g2 Fig 2A PL 3_- Fig.3i DN i1 10 8 il 11 of 0 JARffl 7 2 1 Fig 3A Fig 3B 16 6 11 10 he 10