DE1208601B - Process and mandrel tool for forging gun barrels - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. Cl .:

B 231

German El .: 49Ϊ-16

Number: 1208 601

File number: J 21535 I b / 49 i

Filing date: September 8, 1956

Opened on: January 5, 1966

The invention relates to a method and a mandrel tool for forging gun barrels, namely a process in which, from the rear end of the barrel starting from, in a first step the cartridge chamber having at least one conical shoulder via a cartridge chamber mandrel held in contact with the conical shoulder and the The barrel core is hammered in a second step over a separate helical rib mandrel, with a relative Longitudinal displacement between the workpiece and the helical rib mandrel takes place.

Such methods are known. They are characterized by the fact that they are faster, cheaper and can be carried out with a higher quality than is possible if the cartridge chamber and the core are drilled will.

It is already known to carry out the forging process described in such a way that the helical rib mandrel is inserted into the workpiece only after the cartridge chamber is above the cartridge chamber mandrel forged and the cartridge chamber mandrel is then removed. With this configuration The process, however, can be the exact alignment of the cartridge chamber with the drawn Reaching the barrel core only inadequately because the helical rib mandrel is at the start of the forging process can shift in the radial direction with respect to the cartridge chamber that has already been forged.

The invention is based on the object of designing the forging process in such a way that the known exact alignment of the cartridge chamber and the soul of the barrel even with shorter forging times and smaller deformation is guaranteed.

According to the invention this object is achieved in that in the first step the cartridge chamber and additionally an adjoining barrel section above the cartridge chamber mandrel and the one in the enclosure be hammered on this held and opposite to it centered helical rib mandrel.

The mandrel arrangement used to carry out the method according to the invention is distinguished characterized in that the helical rib mandrel for a face centering with respect to the cartridge chamber mandrel an approach is provided.

A method for forging firearm barrels is also known in which the mandrel tool is formed by a cartridge chamber mandrel and a helical rib mandrel made of one piece with it. In this process, starting from the front end of the barrel, the barrel core is hammered over the helical rib mandrel in a first step, with a relative longitudinal displacement between the process and the mandrel tool for forging
of gun barrels

Applicant:

Ibis Enterprises Limited, Hamilton, Bermuda

(Great Britain)

Representative:

Dipl.-Ing. M. Licht and Dr. R. Schmidt,

Patent Attorneys, Munich 2, Theresienstr. 33

Named as inventor:

Willi Braatz, Sherbrooke, Quebec (Canada)

Claimed priority:
V. St. v. America September 14, 1955
(534 181)

Workpiece and mandrel tool takes place. Immediately afterwards, in a second step the cartridge chamber having a conical shoulder above the inevitably in contact with the hammered conical paragraph held mandrel tool. Differs from the method according to the invention This known method is characterized by the fact that the forging is not from the rear, but from the front Running out begins and that not two separate mandrel tools are used, but a single one. It is true that the cartridge chamber is precisely equiaxed in this known method as well and the running soul guaranteed; however, the tubular workpiece must be used when the barrel core is hammered be pushed away over the cartridge chamber mandrel and therefore a relatively large one have clear exit width, which must be reduced very much during the hammering process. Harvest so strong However, changing the shape of the workpiece requires a lengthy forging process. In the process according to the invention this deficiency is avoided because there by the use of the shared Domes and the other forging direction when hammering the barrel core no relative longitudinal displacement takes place between workpiece and cartridge chamber mandrel, but only a relative longitudinal displacement between the workpiece and the helical rib mandrel, which keeps the exit width smaller can.

509 777/116

Claims (1)

3 4 The subject of an earlier patent is the Ausdorn 87. However, this leads to the fact that in the formation of a dome for the production of firearms indirect connection to the hammering of the patrofen with differently large inner diameters through nenkammer 12 a subsequent barrel hammering of a tubular starting workpiece section over the helical rib mandrel 18 α is hammered with the indicator that 5 is on the mandrel bar. The soul of this barrel section is provided by the twist ribs with twist grooves for the front dome, ie the twist rib dome,
Second dome, ie the cartridge chamber mandrel, longitudinally The axial feed can of course just as well be arranged to be displaceable. In the process, for dome tools and the barrel instead of the wreath of which this dome training is placed under patent protection, forge hammers are granted. That would mean, if the hammering does not take place from the rear end, but rather that the wreath of hammers is fixed and that begins from the front end. Thus, the drive piece 22 together with the barrel core with the pulls on the mandrel tool that is held in advance moves from right to left and only then moves the cartridge chamber until the distance X is covered. Then hammered the second thorn. the next closure closes without interruption An embodiment of the invention is now to 15 travel step, in which a relative longitudinal increase explained with reference to the drawing. In this movement between the barrel 22 on the one hand and the shows surrounded by the wreath of blacksmith's hammers Fig. 1 is a longitudinal section through the rear part of the helical rib mandrel 18a on the other hand. That a firearm barrel with the inserted mandrel can also be done in the manner that, during tool before the start of the hammering process, 20 the wreath of forging hammers and the DraUrip Fig. 2, the dome die used in challenges pendorn α 18 are fixed in space, the workpiece 22 taken condition. wanders to the left. The pin 88 slides out in the process The firearm barrel 22 is drilled so that the hole out. As a result of the sliding of the twist Core bore 10 at a short distance from the ribs in the rearward manufacture in the first process step Firearm barrel by means of a conical 25 th twist grooves is already at the beginning of this longitudinal shoulder merges into a slightly wider bore 12. movement to the twist rib mandrel 18 a rotation The clear width of the bore 10 is given slightly larger on its axis, which continues until the measure as the one that has forged the soul of the finished weft barrel right up to its muzzle. weapon should have, and the clear way of Boh- To in the drawing clearly recognizable tion 12 surpasses the clear 30 by a small amount that the dome tool from the two dor widths the cartridge chamber of the finished firearm is 87 and 18 a, the distance between them is overrun. ben has been shown large. Lay in reality Before the start of the hammering process, these two mandrels meet with their end faces. Firearm barrel 22 has a mandrel from the rear end, so that no burrs are produced at the joint tool introduced, which becomes 35 from a first smooth. The dome designed accordingly to the cartridge chamber During the second process step the barrel 87, FIG. 2, and a second one with twist ribs 22 a feed in the axial direction with reference to FIG See thorn 18a, which experiences through a pin Fig. 1 to the left, the wide thorn 18α 88 is centered on the cartridge chamber mandrel 87 and un- thereby held in the room that the on him depending on this by a shaft 72 attached to it 40 to the right of the front end Shank 72 is displaceable in the axial direction. of the barrel protrudes and its shaft rotatable, but The cartridge chamber mandrel 87 has a cylindrical secured against longitudinal displacement, is mounted.
see section 18 (Fig. 1), the diameter of which corresponds to that of the finished cartridge chamber to the right of the inner shoulder of the drilled out. th barrel 22 located cylindrical end of the Pa-Femer, this dome has a tapered shoulder, which can have a slightly larger contact with the inner tapered shoulder of the pre-drilled diameter than the barrel with the twist ribs, as shown in Fig 1 shows. The cylindrical part of the spiral rib dome 18a seen. The pin 88 is in an axial bore of the cartridge. In this case, it is advisable to slide the end of the cartridge which is rotatable against the swirl chamber dome 87 and abuts the rib mandrel in the longitudinal direction. The second dome 18 α consists of a 50 chamber mandrel 87 to give a short, conical taper with a conical transition surface 90 in the shaft, as FIG. 2 clearly shows. In the course of the first hammering process, a twist ribs protruding from its circumferential surface is formed in the barrel on the transitioning cylindrical body. From which carries. The cartridge chamber mandrel 87 therefore protrudes through the lower end of the barrel 22 during the first forging process and there is a strong axial pressure on the mandrel holder 40 in a dome holder 40, which is exerted under the hydraulic first dome 87 this is at the pressure and ensures that when hammering the conical shoulders not shifted the cartridge chamber mandrel 87 with a conical. Shoulder in contact with the inner tapered shoulder the bore of the barrel remains. Then 60 ^{F begins} the forging process, in which a ring of 1. Process for forging firearm hammers, which surrounds the barrel 22, run on the left of the barrel, in which, starting from the rear barrel end, progressing to the right towards the barrel, in a first step that comes at least kung and brings the barrel to rest on the mandrel a conical shoulder having cartridges. This forging process is continued over a cartridge chamber mandrel held in contact with the conical chamber until the wreath of hammers has covered the distance X heel and the cartridge chamber mandrel. Up to this point in time, the barrel core is hammered in a second step over a twist rib mandrel 18 a in contact with the cartridge chamber - separate twist rib mandrel, whereby a relative longitudinal displacement takes place between the workpiece and the helical rib mandrel, thereby characterized in that in the first step the cartridge chamber and additionally a barrel section adjoining this over the cartridge chamber dome and the one held in attachment to this and centered opposite it Spiral rib mandrel are hammered. 2. mandrel arrangement for performing the forging process according to claim 1, characterized characterized in that the twist rib mandrel (18 a) for front centering with respect to the cartridge chamber dome (87) is provided with a shoulder (88). Documents considered: German Patent No. 923 103; German patent application A21726Ib / 7b made known on July 14, 1955). Older patents considered: German Patent No. 768 149. 1 sheet of drawings 509 777/116 12.65 © Bundesdruckerei Berlin