WO2010040886A1

WO2010040886A1 - Pre-stressed bore barrel and related manufacturing method

Info

Publication number: WO2010040886A1
Application number: PCT/ES2009/070424
Authority: WO
Inventors: Juan Ramón Alonso Tricio
Original assignee: Alonso Tricio Juan Ramon
Priority date: 2008-10-07
Filing date: 2009-10-07
Publication date: 2010-04-15
Also published as: ES2324454B1; ES2324454A1; ES2336535B1; EP2341309A4; EP2341309A1; US20110265365A1; ES2336535A1

Abstract

Enables the loss of firing accuracy caused by the progressive heating of the barrel in a long succession of shots to be reduced, comprising at least: an internal rifled bore (1), an external casing (2), mounted on the rifled bore (1) coaxially, and fitted with a high polar moment of inertia designed to withstand the tension of the rifled bore (1) and at the same time provide rigidity to the unit, and a coupling nut (3) designed to fix said parts together. It also has at least two drilled holes (5, 6) that pass through the wall of the rifled bore (1) balancing the temperature between said rifled bore (1) and the external casing (2), such that the original pre-stressed conditions of the barrel are maintained. The external casing (2) may have a gas intake (10), designed for the operation of a repeater mechanism.

Description

CANON OF PRETENSED ANIMA AND MANUFACTURING PROCEDURE OF THE SAME

D E S C R I P C I Ó N

OBJECT OF THE INVENTION

The present invention belongs to the field of firearms, and more specifically to characteristics and details of the guns of said weapons.

The main object of the present invention is a prestressed fluted barrel that considerably reduces the loss of firing accuracy caused by the progressive heating of the barrel in a long succession of shots.

BACKGROUND OF THE INVENTION

The problem of every cannon is its progressive heating, during the succession of shots. This increase in temperature causes the dilations to appear and the tensions accumulated in the material of the barrel during the manufacturing process are released. All this causes the loss of precision to appear inexorably when the critical temperature is reached. In the fluted bore barrels, during firing, the barrel enters a simple harmonic movement, similar to what one string experiences when one of its ends is shaken while the other is free. According to its intensity, the mouth of the barrel will describe an oval of greater or lesser amplitude. The higher this one, the precision is Go more engaged.

This effect is attempted to alleviate by giving the walls of the guns a greater thickness, in order to achieve greater rigidity, which would simply amount to making the rope thicker. This only delays the much feared effect of the loss of precision, since the dilations eventually appear to be more permanent, due to the greater amount of stored heat. We must also take into account the massive increase in the weight of the weapon, making its handling very cumbersome and annoying.

DESCRIPTION OF THE INVENTION

By means of the present invention, the above-mentioned drawbacks are resolved by providing a prestressed barrel that considerably reduces the unwanted defective movement of a weapon at the time of firing, thereby optimizing the accuracy of firing, and which is also adapted to silence noise. caused by the shots.

Said prestressed barrel, object of the present invention, comprises at least:

- a fluted inner bore,

- an outer jacket, mounted on the coaxially striated bore, and equipped with a high moment of polar inertia adapted to withstand the tension of the striated bore and at the same time give rigidity to the assembly, and

- a union nut that allows the joint work of the striated bore and the outer sleeve. Said fluted bore preferably has at least two holes, located in the vicinity of the end where the connecting nut is arranged and preferably in a diametrically opposite position. Among the components described is an annular air chamber that is tightly closed to the outside. Said holes completely cross the wall of the striated bore, so that they communicate the inside of said fluted bore with the air chamber.

With this arrangement, during the firing phase, the hot gases that are produced inside the striated bore pass into the air chamber, heating the outer jacket until reaching a temperature close to that of said striated bore, so that it is maintained The difference in stress between the striated bore and the outer jacket.

According to a preferred embodiment of the invention in which several drills are made in the striated bore, these are separated by transverse partitions arranged between the striated bore and the outer sleeve, delimiting small independent chambers. Said partitions can be part of bushings that are mounted between the striated bore and the outer sleeve, the bottom of which has an adjustable opening externally to the contour of the striated bore.

It is also provided that the outer jacket has a gas outlet, adapted for actuating a repetition mechanism or the like. When the air chamber is pressurized by means of the holes, it is possible to take a gas intake in the outer jacket, in order to be able to attach the barrel assembly to any weapon with a system of repetition by gas intake.

It would only be necessary to calculate the necessary section of the holes in order to ensure the necessary flow of gas to drive the desired system. Likewise, the point of placement of the holes can be varied, until they are placed in the area in which the gas pressures are the most convenient, to ensure the proper functioning and correct automation of the firing sequences.

Preferably, the air chambers remaining between the striated bore and the outer jacket can be filled with a low density material and a high thermal conduction power, in order to facilitate the best thermal equilibrium between these two pieces.

In accordance with another object of the invention, a manufacturing process of the prestressed cannon described above is described, which comprises the following steps:

- raising the temperature of the fluted bore slightly above the working temperature, preferably at a temperature of the order of between 25O ⁰ C and 300 ⁰ C, in order to expand it slightly more than necessary. This occurs at temperatures where the material is within the elastic period,

- assembly of the outer jacket on the striated bore, and - fixing of the striated bore and the outer sleeve by means of the union nut.

Upon returning the striated bore to its initial temperature, it attempts to regain its initial position. When this is not achieved, since the outer jacket is prevented, the bore remains in a position similar to that of a rope tensioned from its ends. In this situation, the intensity of the simple harmonic effect is clearly eliminated since, since the whole soul is stressed, it is practically impossible for this phenomenon to occur. In this way the oval defined by the mouth of the barrel, is seen, if not eliminated in its entirety, if reduced to negligible proportions.

According to a second preferred embodiment, the manufacturing process of the cannon of the prestressed bore is carried out at room temperature, comprising the following steps: - assembly of the outer sleeve on the ribbed bore,

- clamping of the splined bore and the outer sleeve by means of the union nut,

- mooring the striated bore by its ends by means of a traction machine adapted to produce an elongation of said striated bore,

- Tighten and close the union nut against the outer jacket once the desired elongation is achieved by means of the traction machine.

In this way, when the assembly of the traction machine is removed, the striated bore is permanently prestressed, since the outer jacket prevents it from recovering its initial position.

Therefore, by means of the prestressed bore barrel of the present invention it is possible to ensure simultaneous heating of the different parts that make up said barrel, so that the defective movement of the barrel mouth is reduced by optimizing the accuracy of firing. At the same time that a means silencer of the noise of the shots is achieved. DESCRIPTION OF THE DRAWINGS

To complement the description that is being made and in order to help a better understanding of the characteristics of the invention, according to a preferred example of practical implementation thereof, a set of drawings is attached as an integral part of said description. where, for the purposes of illustration and not limitation, the following has been represented:

Figure 1.- Shows a view in longitudinal section of the prestressed bore barrel object of the invention, with an outer sleeve of straight profile.

Figure 2.- Shows a cross-sectional view of the prestressed bore barrel, taken along the line A-A 'of Figure 1.

Figure 3.- Shows a longitudinal sectional view of a prestressed bore barrel with an outer jacket with an inclined profile.

Figure A - Shows a cross-sectional view of the prestressed bore barrel, taken along the line B-B 'of Figure 3.

Figure 5.- Shows a sectional view of a prestressed barrel equipped with two holes.

Figure 6.- Shows a cross-sectional view of the prestressed bore barrel, taken along the N-Il cut line of Figure 5.

Figure 7.- Shows a sectioned view of the prestressed bore barrel according to a preferred embodiment of the invention in Ia that a plurality of drills are provided.

Figure 8.- Shows a sectioned view of the prestressed bore barrel in accordance with another possible preferred embodiment of the invention where the gas intake of the outer jacket can be seen.

PREFERRED EMBODIMENT OF THE INVENTION

In Figures 1, 3, 5, 7 and 8, a prestressed bore barrel is shown, comprising a splined bore (1) on which an outer jacket (2) coaxially mounted with a high moment of polar inertia is mounted externally. The outer jacket (2) is fitted on one side on the surface of the fluted bore (1), while on the opposite it is fixed to said fluted bore (1) by means of a union nut (3).

Figures 1 and 3 show the cross-sectional views of two fluted barrels with their outer sleeves (2) with a straight and inclined profile respectively. Likewise, figures 2 and 4 show their transversal views.

As can be seen in Figure 5 and 6, the splined bore (1) has two holes (5, 6), located in the vicinity of the end where the union nut (3) is arranged and in a diametrically opposite position . Among the components described is an annular air chamber (4) that is tightly closed to the outside.

Said holes (5, 6), shown in Figures 5-8, completely cross the striated bore wall (1), so that they communicate the inside of said striated bore (1) with the annular air chamber (4). With this arrangement, the hot gases that are produced inside the Striated bore (1) during the firing of shots passes to the air chamber (4), heating the outer jacket (2) until reaching a temperature close to that of said striated bore (1), so that the difference in tensions between the striated bore (1) and the outer jacket (2).

In Figure 7 a variant of execution is shown in which in the striated bore (1) several drills (5, 6) are practiced, which are separated by transverse partitions (7) arranged between the striated bore (1) and the sleeve exterior (2), and that delimit small independent cameras (4 '). Said transverse partitions (7) are part of some bushings (8), shown in Figure 7, which are mounted between the striated bore (1) and the outer sleeve (2), the bottom of which has an opening adjustable externally to the contour of the fluted bore (1).

Also in Figure 8 a prestressed bore cannon is shown, whose outer jacket (2) has a gas outlet (10), adapted for actuating a repetition mechanism. When the air chamber is pressurized by means of the holes (5, 6), it is possible to make a gas intake in the outer jacket (2), in order to be able to attach the barrel assembly to any weapon with repetition system by taking gases

Claims

1. Prestressed bore barrel characterized in that it comprises at least: - a ribbed bore (1) inside,

- an outer jacket (2), mounted on the striated bore (1) coaxially, and equipped with a high moment of polar inertia adapted to withstand the stress of the striated bore (1), and

- a union nut (3) adapted for the joint fixing of the spline bore (1) and the outer sleeve (2).

2. Prestressed barrel according to claim 1, characterized in that an air chamber (4) is defined between the striated bore (1) and the outer jacket (2).

3. Prestressed barrel according to claim 2 characterized in that the air chamber (4) is filled with a material of low density and high thermal conduction.

4. Prestressed barrel according to claim 2, characterized in that it additionally incorporates at least two holes (5, 6) that pass through the wall of the striated bore (1) communicating the interior of said striated bore (1) with the air chamber (4).

5. Prestressed barrel according to claim 4, characterized in that the holes (5, 6) are located in the vicinity of the end in which the union nut (3) is arranged.

6. Prestressed barrel according to any one of claims 4 or 5, characterized in that the holes (5, 6) are located in diametrically opposite position.

7. Prestressed barrel according to any one of claims 4-6, characterized in that the holes (5, 6) are separated by transverse partitions (7) arranged between the splined bore (1) and the outer sleeve (2) , delimiting small independent cameras (4 ').

8. Prestressed barrel according to claim 7, characterized in that the transverse partitions (7) are part of some cavities (8) that are mounted between the splined bore (1) and the outer jacket (2)

9. Prestressed barrel according to claims 1, 2 and 7, characterized in that the outer jacket (2) has a gas outlet (10), adapted for actuating a repetition mechanism.

10. Method of manufacturing the prestressed barrel described in any one of claims 1-9 characterized in that it comprises at least the following stages: - raising the temperature of the barrel (1) slightly above the working temperature, dilating it within the range of elasticity of said barrel (1); Y

- Assembly of the outer jacket (2) on the barrel (1) covering it in its entirety and fixing both bodies jointly by means of the union nut (3).

11. Manufacturing method according to claim 10 wherein the rifled (1) is subjected to a temperature between 25O ⁰ C and 300 ⁰ C. The

12. Process for manufacturing the prestressed barrel described in any one of claims 1-9, characterized in that it is carried out at room temperature and comprises the following steps: - assembly of the outer jacket (2) on the grooved bore (1),

- clamping the striated bore and the outer sleeve by means of the union nut (3),

- mooring the striated bore (1) at its ends by means of a traction machine adapted to produce an elongation of said striated bore (1),

- Tighten and close the union nut (3) against the outer jacket (2) once the desired elongation is achieved by means of the traction machine.