Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F41—WEAPONS
  • F41A—FUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE
  • F41A21/00—Barrels; Gun tubes; Muzzle attachments; Barrel mounting means
  • F41A21/16—Barrels or gun tubes characterised by the shape of the bore
  • F41A21/18—Grooves-Rifling
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F41—WEAPONS
  • F41A—FUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE
  • F41A21/00—Barrels; Gun tubes; Muzzle attachments; Barrel mounting means
  • F41A21/22—Barrels which have undergone surface treatment, e.g. phosphating

Definitions

• the invention relates primarily to a chromed inner profile for particular small-caliber machine guns.
• the chrome plating is characterized by the fact that it is applied over the entire length of the gun barrel, including in the highly thermally stressed areas.
• a new inner profile for machine guns is provided such that it is designed as a profile with polygons and with a field height, which still allow a planned Verchromungs harshdicke.
• Machine guns in particular small-caliber area are subject to high standards. It is known that gun barrels or gun barrels are provided in the medium caliber and large caliber range with an internal chrome plating. Thus, the weapon tubes can absorb higher loads better.
• the field-tensile profile may only be about 0.26 mm, so that in conventional field-train geometries of the machine guns a difference between train and field of 0, 13 mm are available.
• a chrome plating is usually set at 1/10.
• no clean contour is created in such small calibers, so that in the high pressure ranges, the train-field profile is not prevented from shearing on the trains and these can break away.
• DE 10 2005 043 924 B3 discloses a possibility of hardening an inner surface of a small-diameter weapon barrel.
• a reflector arrangement is used, in which a reflector head deflects a laser light beam onto a section of the inner surface.
• the invention has as its object to show a possibility that realizes a weapon barrel with a small diameter for high loads.
• the invention is based on making a full chrome plating of the gun barrel, not just a highly stressed area.
• the invention is based on the further idea, due to the general condition of the internal geometry of the cross-sectional area to modify the inner profile over known inner profiles of particular small caliber weapons.
• a new inner profile of a polygon a flattened sawtooth profile, taking into account a same predetermined (pressure) cross-section is provided.
• the strip forces can be better absorbed or held by the field profile.
• This inner profile then allows a chrome plating the gun barrel.
• a spinline profile for projectile runs is known.
• the helical swirl flank surfaces located between the fields and trains form a self-locking angle with the respective radius formed at the foot of the flank, which keeps the radial component acting on the pipe wall as small as possible.
• the barrel has two trains. The trains run in cross-section from the foot of their flank about 90 ° to a half-nominal caliber corresponding arc around the axis of the barrel and then about a flat Archimedean spiral or parabola section to the apex of the next flank.
• WO 97/45690 A1 shows a towed weapon barrel with a polygon profile.
• Another variant of this type describes the US 4,308,681 A1.
• already US 329,303 A1 and US 835,482 A1 proposed such tension profiles as disclosed in US 4,308,681 A1.
• chromium plating of small bore rifle barrels is not recognizable.
• US 2008/0120889 A1 mentions in this regard that chrome plating is known for large-caliber weapons. Processes for this are disclosed in DE 43 35 139 A1 and DE 44 19 864 C2
• the surfaces of the fields are provided with a thicker chrome layer than the faces of the trains during manufacture. Between both a layer transition is involved.
• the chrome plating is carried out in a chromium electrolyte and by means of pumps which pump the electrolyte through the barrel or barrel.
• the chromium deposition takes place in a known manner.
• 1 is a sectional view of a train-field profile with eight trains
• Fig. 2 is an enlarged view B of Figure 1.
• FIG. 1 an otherwise not shown weapon barrel 1 is shown in a sectional view.
• This has an inner profile 2 with 3 fields and trains 4.
• the fields 3 are designed as polygons - trapezoidal and asymmetrical - which are much narrower than the trains 4.
• the polygons have a relatively long rise 5 on one side and a rapidly descending or falling edge 6 on the other side (FIG. 2).
• Such a constructive form of the fields 3 allows a better absorption of the power forces on the vertical height.
• chrome To increase the life of the gun barrel 1 is now provided to chrome the whole barrel 1.
• the chromium layer 7 on the tracks 4 is thinner than the chromium layer 8 on the fields 3.
• transitions 9 of field 3 on train 4 and train 4 on field 3 are applied.
• the preferred chromium plating thickness for the chromium layer 7 of the panel 3 would be about 0.095 mm and the chrome layer thickness 8 of the bead 4 would be about 0.075 mm.
• the area of the train 4 should be about 3.44 mm.
• the slope 5 of the flanks 6 can be provided with 62.5 ° ( ⁇ 0.5 °), the flank with 25 ° ( ⁇ 0.5 °).

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• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Electroplating Methods And Accessories (AREA)

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Citations (13)

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• 2012
  • 2012-01-17 DE DE102012000686A patent/DE102012000686A1/de not_active Withdrawn
  • 2012-12-17 PL PL12810204T patent/PL2805124T3/pl unknown
  • 2012-12-17 WO PCT/EP2012/075742 patent/WO2013107578A1/fr not_active Ceased
  • 2012-12-17 ES ES12810204.3T patent/ES2677470T3/es active Active
  • 2012-12-17 DK DK12810204.3T patent/DK2805124T3/en active
  • 2012-12-17 EP EP12810204.3A patent/EP2805124B1/fr active Active

Patent Citations (14)

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