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US3863499A - Simulating firing stresses in gun barrels - Google Patents

Simulating firing stresses in gun barrels Download PDF

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Publication number
US3863499A
US3863499A US273270A US27327072A US3863499A US 3863499 A US3863499 A US 3863499A US 273270 A US273270 A US 273270A US 27327072 A US27327072 A US 27327072A US 3863499 A US3863499 A US 3863499A
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US
United States
Prior art keywords
barrel
charge
clearance
insert body
bore
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US273270A
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English (en)
Inventor
Boutteville Sigmund Von
Horst Rekittke
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Rheinmetall Industrie AG
Original Assignee
Rheinmetall GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Rheinmetall GmbH filed Critical Rheinmetall GmbH
Application granted granted Critical
Publication of US3863499A publication Critical patent/US3863499A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F41A31/00—Testing arrangements

Definitions

  • the present invention relates to a method of and an apparatus by which gun barrels may be subject to substantially the same stresses as when actually fired, without the expenditure involved in test firing using live ammunition and is primarily concerned with endurance tests normally requiring a large number of test firings.
  • the method of testing a barrel comprises the insertion into the interior of the barrel of an insert body occupying only part of the barrel diameter and leaving an annular cavity between the internal wall of the barrel and the external wall of the insert, the internal wall of the barrel being directly subjected to gas pressure by detonating a propulsive charge which is less than that normally used with an actual projectile firing.
  • the insert body reduces considerably the volume of the loading chamber, so that the gases of the charge are caused to act directly on the internal wall of the barrel.
  • the expenditure involved is also greatly reduced owing to the absence of a projectile.
  • the necessary initial restraint of the charge gases must be produced by other means. This can be achieved by a nozzle and- /or rupture plate in the outflow orifice of the gases from the charge.
  • suitable bores and cavities in the insert body ensure that not only the barrel but also the breech block is subjected to the gas pressure in the same manner as in actual firing, so that the durability of the breech block may be tested at the same time as the barrel.
  • the charge can be accommodated either in the insert or in a-casing separate therefrom.
  • FIG. 1 is a longitudinal section through a gun barrel showing the insert body in position
  • FIG. 2 is a longitudinal section through the breech part ofa gun barrel with insert body and charge casing
  • FIG. 3 is a cross section taken along the lines A-B of FIG. 2.
  • this embodiment can be built into the original gun without any appreciable alterations to the barrel or breech block.
  • the comparatively small recoil forces occurring with the simulated firing are absorbed by the gun carriage without difficulty.
  • the breech-end or rearward part of a gun barrel 1 has a loading chamber which can be closed by a sliding wedge-type breech block 3 displaceably mounted in a base 2.
  • the insert body 4 of the simulator is fitted into the loading chamber and is sealed off at its ends from the internal wall of the barrel.
  • the rear end of the insert body is provided at A with a collar-shaped flange 5, which is inserted in a recess in the barrel by means of a sealing packing 6, while the front end is provided at B with peripheral packing seals 8.
  • the insert body is of reduced diameter, to form an annular chamber 9 between its periphery and the internal wall of the barrel.
  • the insert body In its rear range, the insert body is provided with a loading chamber for a cartridge 10 containing a propulsive charge.
  • the loading chamber is changed via a nozzle 11, forming a thrust face for a rupture plate 12, into a lengthwise bore 13 extending forwardly and which is open to its front.
  • the rupture plate and nozzle can be dimensioned in accordance with the loading and combustion chamber parameters, such that the gas pressure takes the desired course over a period of time.
  • the insert body is also provided, in the region behind the rupture plate, (i.e. between the latter and the cartridge) with radial bores 14, which communicate the loading chamber with the annular chamber 9.
  • the wedge-type breech block 3 rests against an annular seal 15, which is situated within an annular flange 5 of the insert and also against the base 16 of the propulsive charge casing.
  • the diameter D, of the annular seal and the latter itself correspond to the bore of the barrel to be tested.
  • the flange has a recess by which a discshaped chamber 17, is created. This chamber is connected via longitudinal bores 18, and via an annular groove 19, provided in the insert, with the annular chamber 9.
  • the gases of the charge pass through the bores 14 into the annular chamber 9, where they act on the internal wall of the gun barrel, between the ends A and B of the insert, with the same gas pressure and approximately the same gas temperatures as in actual firing. Furthermore, the gases flow through the annular groove 19 and the bores 18 into the chamber 17, in which, in conjunction with the gas pressure acting on the base 16 of the charge casing, they exert a pressure on the breech block wedge and the annular seal 15, which corresponds to an actual firing.
  • the charge is selected, as regards properties and quantity, so that the course taken by the gas pressure will correspond to that prevailing in a real firing of a projectile in the gun.
  • FIG. 2 a further embodiment of the apparatus is disclosed.
  • the rear part 1 of a barrel which is subjected to the maximum stress and which comprises the loading chamber and the starting range of the barrel, in place of the entire barrel of the gun.
  • An existing whole barrel can be effectively shortened to the necessary length as required.
  • the shortened barrel 1' can be closed at the rear with the normal breech 2 and the wedge 3.
  • a casing 20 accommodating the propulsive charge or the cartridge, respectively, can be inserted in the loading chamber.
  • the gap between the casing 20 and the barrel 1 can be sealed at the rear, for example, by means of a plastic annular seal 29.
  • the insert body 4' is guided in the barrel 1 by ribs 21, while at the front it is screwed into a pressure plate 22.
  • the axial gas force acting on the insert body 4' is transmitted from the pressure plate 22 via a sealing piece 23 and the screw-fitted casing tube 24 to the base 2.
  • the casing tube 24 is separated by an air gap from the barrel 1 and is provided with apertures 25 which enable probes for measuring pressure, expansion and temperature to be affixed to the barrel 1.
  • a rupture plate 12 which is introduced from the front, prior to the simulated firing, and pressed against an annular seating surface by a hollow clamp screw 27.
  • a feature of the embodiment disclosed in FIG. 2 resides in the fact that the wall of the barrel can be subjected to gases as far as the start of the drawn part of the barrel proper.
  • An apparatus for testing gun barrels by simulating actual firing stresses without a projectile therein comprising:
  • a gun barrel an insert body mounted in the loading chamber of said gun barrel to reduce the volume of said loading chamber and extending axially along part of the length thereof, the middle portion of said insert body defining an annular clearance between the ends of said body and the inner wall of said gun barrel, said ends of the insert body sealingly engaging said inner wall of the gun barrel; means for mounting an explosive charge in said barrel of an intensity less than that of a normal propulsive charge for ejecting shells from the barrel to produce gas at an elevated temperature, said clearance communicating with said charge whereby the hot charge gases pass through said clearance;
  • a rupturable plate closing said barrel on the opposite side of said clearance and sustaining a predetermined pressure in said clearance upon detonation of said charge but rupturing beyond said predetermined pressure.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
  • Management, Administration, Business Operations System, And Electronic Commerce (AREA)
US273270A 1971-08-07 1972-07-19 Simulating firing stresses in gun barrels Expired - Lifetime US3863499A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2139735A DE2139735C3 (de) 1971-08-07 1971-08-07 Einrichtung zum Simulieren der Schußbeanspruchung von Geschützrohren

Publications (1)

Publication Number Publication Date
US3863499A true US3863499A (en) 1975-02-04

Family

ID=5816169

Family Applications (1)

Application Number Title Priority Date Filing Date
US273270A Expired - Lifetime US3863499A (en) 1971-08-07 1972-07-19 Simulating firing stresses in gun barrels

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US (1) US3863499A (de)
DE (1) DE2139735C3 (de)
GB (1) GB1334655A (de)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4793179A (en) * 1988-02-10 1988-12-27 Honeywell Inc. Apparatus and method for pressure burst testing of a vessel
US4845996A (en) * 1988-04-07 1989-07-11 Berminghammer Corporation Limited Test system for caissons and piles
US4930391A (en) * 1989-07-24 1990-06-05 Kapp Joseph A Method and apparatus for fatigue and fracture testing of large caliber cannons
CN106123677A (zh) * 2016-08-09 2016-11-16 中国人民解放军军械工程学院 一种高炮自动机故障诊断实验平台
CN108593184A (zh) * 2018-05-08 2018-09-28 西安航天三沃机电设备有限责任公司 一种用于特种爆破压力测量的爆破压力传感器
US20210222985A1 (en) * 2020-01-16 2021-07-22 Bill Wiseman & Co., Inc. Universal Receiver Test Fixture
US11215418B1 (en) * 2019-08-30 2022-01-04 The United States Of America As Represented By The Secretary Of The Army Firing pin indent gauge
CN119309452A (zh) * 2024-11-07 2025-01-14 南京理工大学 一种身管武器发射试验装置
US12372320B1 (en) * 2021-12-03 2025-07-29 Biofire Technologies Inc. Systems and techniques for testing a gun

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2700600C2 (de) * 1977-01-08 1982-02-11 Diehl GmbH & Co, 8500 Nürnberg Vorrichtung zum Prüfen von Waffenrohren
CN105043886B (zh) * 2015-06-26 2018-08-21 中国船舶重工集团公司第七二五研究所 一种天然气压力容器进行气、水压试验的双介质试验装置

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2377425A (en) * 1942-10-23 1945-06-05 Battelle Memorial Institute Experimental gun
US2448203A (en) * 1946-01-18 1948-08-31 Us Sec War Powder tester
US3043137A (en) * 1958-09-29 1962-07-10 Austin B J Clark High pressure device
US3568600A (en) * 1968-08-08 1971-03-09 Robert Amos Nosler Method and apparatus for checking firing pressure of ammunition
US3721456A (en) * 1971-04-23 1973-03-20 Gen Motors Corp Multiple stage inflater

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2377425A (en) * 1942-10-23 1945-06-05 Battelle Memorial Institute Experimental gun
US2448203A (en) * 1946-01-18 1948-08-31 Us Sec War Powder tester
US3043137A (en) * 1958-09-29 1962-07-10 Austin B J Clark High pressure device
US3568600A (en) * 1968-08-08 1971-03-09 Robert Amos Nosler Method and apparatus for checking firing pressure of ammunition
US3721456A (en) * 1971-04-23 1973-03-20 Gen Motors Corp Multiple stage inflater

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4793179A (en) * 1988-02-10 1988-12-27 Honeywell Inc. Apparatus and method for pressure burst testing of a vessel
US4845996A (en) * 1988-04-07 1989-07-11 Berminghammer Corporation Limited Test system for caissons and piles
US4930391A (en) * 1989-07-24 1990-06-05 Kapp Joseph A Method and apparatus for fatigue and fracture testing of large caliber cannons
WO1991001477A1 (en) * 1989-07-24 1991-02-07 Kapp Joseph A Method and apparatus for fatigue and fracture testing of large caliber cannons
CN106123677A (zh) * 2016-08-09 2016-11-16 中国人民解放军军械工程学院 一种高炮自动机故障诊断实验平台
CN108593184A (zh) * 2018-05-08 2018-09-28 西安航天三沃机电设备有限责任公司 一种用于特种爆破压力测量的爆破压力传感器
CN108593184B (zh) * 2018-05-08 2023-10-17 西安航天三沃机电设备有限责任公司 一种用于特种爆破压力测量的爆破压力传感器
US11215418B1 (en) * 2019-08-30 2022-01-04 The United States Of America As Represented By The Secretary Of The Army Firing pin indent gauge
US20210222985A1 (en) * 2020-01-16 2021-07-22 Bill Wiseman & Co., Inc. Universal Receiver Test Fixture
US11906259B2 (en) * 2020-01-16 2024-02-20 Bill Wiseman & Co., Inc. Universal receiver test fixture
US12372320B1 (en) * 2021-12-03 2025-07-29 Biofire Technologies Inc. Systems and techniques for testing a gun
CN119309452A (zh) * 2024-11-07 2025-01-14 南京理工大学 一种身管武器发射试验装置

Also Published As

Publication number Publication date
DE2139735B2 (de) 1973-07-19
DE2139735C3 (de) 1974-02-21
DE2139735A1 (de) 1973-02-15
GB1334655A (en) 1973-10-24

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