DE3341820A1 - Method and device for determining the angle of twist of weapon tubes - Google Patents

Abstract

The application relates to a method for determining the angle of twist alpha of a weapon tube 1 having a groove/land profile, and a device for carrying out this method. A weapon tube 1 is fixed axially and radially on a test bench 4. A probe 2, which is connected via the measuring sleeve 10 to a measuring carriage 3 which can be moved rectilinearly is moved in a groove of the weapon tube 1. During the rectilinear movement of the measuring carriage 3, the probe 2 describes an angle of rotation DELTA beta which is used together with the path length DELTA . covered to determine the angle of twist alpha via the mathematical relationship <IMAGE> . <IMAGE>

Description

Method and gate direction for determining the helix angle of weapon

pipes The invention relates to a method for determining the swirl vortex and the twist curve of a weapon barrel provided with a train-field profile and a Apparatus for carrying out such a method.

As in Rheinmetall, Waffentechnisches Taschenbuch 1977, pages 523 until 527 can be read about the twist, the trains form with one to the soul axis parallel line on the inner wall of the pipe, the twist angle, which is analogous to the pitch angle of a steep thread. There is between the helix angle and the helix length the relationship tan o & - (D = twist length in caliber). The gun barrels can now be designed with different types of twist, such as. With constant twist over the lead length of the weapon barrel, with parabolic twist, sinusoidal or cubic-parabolic Twist or with a combination of one with the other type of twist.

It is now a particular problem in the manufacture of gun barrels the helix angle both between the individual machining steps as well as in the Final inspection to be checked quickly and safely. The ones that have been used in practice so far Methods are consistently mechanical measurements that are tedious and the plan have a faulty test.

It is therefore the object of the invention to provide a method and a device to determine the helix angle of gun barrels to create that safely and quickly runs, is easy to use and technically complex and sources of error avoids during the measuring process. The method and the device should be suitable for this purpose be, the twist angle at any point in the leadership of the gun barrel determine.

These objects are achieved according to the invention in that a with an axially parallel to the weapon barrel can be moved in a straight line, rigidly connected, Measuring head centered on the soul axis of the weapon barrel with ileß button in one the trains of an axially and radially stationary weapon barrel is used, which is used in measured axial path length of the measuring slide from an initial measuring point to a End measuring point uptake table covers an assigned angle of rotation # ß = ß2 - ß1, which displayed as a measurement result together with the traveled length of the measuring slide or is recorded and the determination of the twist ruin via the mathematical Relationship 2 ### r (ß2 - ß1) tan α = # 360 ° (x2 - x1), in which r the The measuring radius in the weapon barrel is.

This process is particularly suitable for machine use and after appropriate processing operations, it is safe and quick and provides a guarantee for an error-free determination of the twist angle. The inventive method provides a simple way of turning an angle with an associated, axial Path length from which the twist angle of the weapon barrel can be determined in a known manner leaves. The axial displacement of the carriage is used in one of the trains The measuring probe is forced to move in a helical manner, the two coordinates being: axial path length and the returned angle of rotation can be read or displayed.

The device for performing the method for determining the The twist angle of a weapon barrel is characterized in an inventive solution by that a letbank with a gun barrel clamping device arranged in the front part is provided to which is in axial extension a slide guide connected with a slide that can be moved coaxially to the weapon barrel or barrel core, whose articulated probe can be used in a train of the weapon barrel is. The weapon barrel clamping device can have support prisms on which the gun barrel is held in place axially and radially by tensioners.

In a preferred embodiment, the measuring probe can have an interposed Messinole be connected to the slide. To determine the axial path length can the measuring bench is also equipped with a length ruler arranged on one long side which runs parallel to the slide guide and from the slide during the displacement can be tapped to determine a distance covered. The axial displacement and that caused by the probe in the guidance of a gun barrel train determined angles of rotation can either be analog or digital in a special display shown and in a connected computer for determining the helix angle can be used.

The entire structure of the measuring tape is very simple. While in the front Part of the weapon barrel is stored in a defined manner, the actual part is located in the rear part Measuring device. This measuring bench lends itself to the processing machines for Manufacture of a gun barrel to be integrated with a train-field profile. She is suitable is also just as good for the final inspection of the twist curve, which is made up of individual twist angles is composed.

The weapon barrel to be tested is used for such control and measurement purposes only placed on the prism support and clamped there so that one then initiated axial deflection of the measuring slide a probe in the tension profile of the Weapon barrel moved helically, whereby an angle of rotation can be determined. the Conversion using the mathematical relationship tan <= 2 rW r (ß 2 t 1) 3600 ( x2 - x1) is compared with the target curve. Of course you can with this Device of the twist angle at any point on the gun barrel and on any desired length can be determined.

An example of the invention is shown in the drawing.

1 shows the method for determining the helix angle in a schematic representation in the diagram; Fig. 2 the device for implementation the method for determining the helix angle in a schematic representation; Fig. 3 a measuring head in view.

According to the method according to the invention for determining the helix angle of a weapon barrel, a rotation angle b13 is a function of a back @ -placed Distance #x measured. Figure 1 shows a diagram of a weapon barrel 1 in Shape of a cylinder with the measuring radius r. Lin with a straight line towards the Tube core 8 movable slide 3 connected to itself very precisely centering Measuring head 2 with probe 15 has its starting point at xl and lies in one of the moves of Waffenochres 1.

The straight movement of the carriage 3 on the path length xl after x, has the effect that the probe 45 during the distance # x is angled to point ß2 has hiked. The probe 15 has therefore run through an arc from to ß2, at which ß1 is identical to the point x2.

This arc includes the angle of rotation # ß, which is made up of ß2 - ß1 suffered.

With the help of the obtained angle of rotation # ß on the distance covered ßX is the twist angle α according to the mathematical relationship ten α = # 2 # # # r. (Ss2 - ß1) 3600 (X2 - calculable.

The procedure for determining the angle of rotation is carried out by means of a measuring bench 4. In the front part of the bench 4 there is a prismatic support 5, into which a Weffenrchr 1 to be checked is inserted.

The weapon barrel 1 is secured by means of the clamps 6 arranged at both ends axially and radially held stationary.

In the axial extension to the prism support 5 is a slide guide 7 arranged, which runs in a straight line and coaxially to the tubular core 8.

On the slide guide 7, a slide 3 is movable, which with egg measuring quill 10 and a measuring head 2 attached thereto is connected. The measuring head 2 is inserted centrally to the axis of the soul in the weapon barrel 1 and is stored in the weapon barrel 1 on three bearings evenly distributed around the circumference. As especially Figure 3 shows, the measuring head 2 has exiting probe 15 on its lateral surface, which Place on the field edge of the train-field profile in the weapon barrel 1. Inside the measuring head 2 there is also the inductive measurement recording unit 16. @in on the measuring head 2 connected motor 17 causes a constant measuring force on the measuring head 2. The The double arrow 18 shows the axial travel and the double arrow 19 shows the angular travel covered at.

On the long side of the bed bench 4 in an axially parallel arrangement to the slide guide 7 a length rod 9 is provided. A tap 11 on the measuring slide 3 runs over the length scale 11 and shows the distance traveled.

The probe 15 of the measuring head 2 is now in a train of the weapon barrel 1 introduced and travels through the straight-line slide movement along the path #x x = x2 - xl the twist curve in the weapon barrel 1. here is through the probe 15 when driving through the radian dimension of (s 1 after directly the angle of rotation # ß is determined. Both the determined length measurement #x and the angle of rotation # ß are in the display 12 can be seen.

Both values are fed to the computer 13, which then calculates the angle of twist α determined according to the formula 2 # # # r # ß tan α = # 360 ° #x.

The helix angle # can in turn be shown in the display. It can also be written out in a printer 14 connected to the computer 13 will.

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Claims (6)

Claims 1. Method for determining the helix angle or the twist curve of a gun barrel provided with a train-field profile, thereby characterized in that one can be moved in a straight line with an axially parallel to the weapon barrel (1) Measuring slide (3) rigidly connected to the core axis of the weapon barrel (1) centered Measuring head (2) with probe (15) in one of the trains of an axially and radially stationary Weapon barrel (1) is used, the measured axial path length of the measuring slide (3) from an initial measuring point (xl) to an end measuring point (x2) automatically assigned rotation angle A ß = 2 - ß1 covered, which together as a measurement result is displayed or recorded with the distance traveled by the measuring slide (3) and the determination of the helix angle (α) via the methematic relationship 2 ### r (ß2 - ß1) tan α = # 360 ° (x2 - x1), in which r is the measuring radius is in the gun barrel (1). 2. Device for performing the method for determining the Twist angle of a weapon barrel provided with a pull-field profile, characterized in that that a measuring bench (4) with a weapon barrel clamping device arranged in the front part is provided, on which a slide guide (7) is located in an axial extension a coaxially to the weapon barrel (1) displaceable Iiessschlitten (3) is connected, whose Heßkopf (2) with connected probe (15) can be inserted into the weapon barrel (1) is. 3. Apparatus according to claim 2, characterized in that the weapon barrel clamping device Has support prisms (5) on which the weapon barrel (1) is axially supported by a tensioner (6) and is held radially stationary. 4. Apparatus according to claim 2, characterized in that the measuring head (2) is connected to the Lleßschlitten (3) via a measuring quill (10). 5. Apparatus according to claim 2, characterized in that the measuring tape (4) is provided with a length scale (9) arranged on the long side, which runs parallel to the slide guide (10) and from the measuring slide (3) during the shift can be tapped. 6. Device according to claims 2 to 5, characterized in that that the axial displacement and that through the measuring head (2) in the guide of a Weapon barrel train determined rotation angle (13) either analog or digital in one Display (12) displayed and in a connected computer (13) to determine the Helix angle are used.