US3327518A - Method of and device for measuring the wear in a gun barrel - Google Patents
Method of and device for measuring the wear in a gun barrel Download PDFInfo
- Publication number
- US3327518A US3327518A US432617A US43261765A US3327518A US 3327518 A US3327518 A US 3327518A US 432617 A US432617 A US 432617A US 43261765 A US43261765 A US 43261765A US 3327518 A US3327518 A US 3327518A
- Authority
- US
- United States
- Prior art keywords
- plug
- projectile
- wear
- barrel
- firing
- 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
Links
- 238000000034 method Methods 0.000 title claims description 16
- 239000003380 propellant Substances 0.000 claims description 29
- 238000010304 firing Methods 0.000 claims description 25
- 239000007789 gas Substances 0.000 claims description 22
- 239000000463 material Substances 0.000 claims description 13
- 238000005303 weighing Methods 0.000 claims description 6
- 238000012360 testing method Methods 0.000 description 30
- 230000003628 erosive effect Effects 0.000 description 7
- 238000002485 combustion reaction Methods 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/56—Investigating resistance to wear or abrasion
- G01N3/567—Investigating resistance to wear or abrasion by submitting the specimen to the action of a fluid or of a fluidised material, e.g. cavitation, jet abrasion
-
- 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 invention relates to a method of and a device for measuring the wear in a gun barrel by providing as test or reference unit a hollow plug made of the same material as the barrel, weighing the plug, firing the plug through the gun barrel and again weighing the plug. The difference in weight then constitutes a measure of the wear experienced by the gun barrel.
- the invention relates to a method of measuring the wear in a gun barrel or other tubular launching device due to the firing of a projectile by gases propelling the projectile through the barrel.
- the invention also relates to a device for measuring the wear in a gun barrel or other tubular launching device as a result of the firing of projectiles.
- the wear which is experienced by the gun barrel is primarily due to mechanical and thermal action.
- the thermal wear is caused by the heat of the propellant gases, and extensive investigation has shown that the mechanical wear is most probably a function of the thermal wear.
- One of the conventional Wear tests heretofore used is to fire projectiles through the gun barrel until the barrel is worn beyond acceptable limits.
- the barrels used for such tests are selected at random from a production run and the projectiles used for the tests are also selected at random from a production run.
- the measured relations between the erosion effects caused by different propellants, for instance, different types of powder, used in a test bomb are primarily a function of the explosion heat of the powder. There are very little, if any at all, affected by the physical structure of the grains of powder and the variations in the combustion characteristics as caused by the differences in the physical structure of the grains of powder. Extensive tests and analysis have shown that the measured values as obtained by firing an erosion bomb of the conventional type as hereinbefore described are highly deceptive and are of very little practical value for determining the wear which a barrel will experience when projectiles are actually fired through the same.
- a more specific object of the invention is to provide a novel and improved method of measuring the wear in a gun barrel upon firing a projectile therethrough, which method utilizes the principle of a test plug as hereinbefore referred to in a novel and improved manner in that the thermal action experienced by the plug when a flow of propellant gases is directed therethrough substantially duplicates the thermal action experienced by the gun barrel when a projectile is fired through the same. Accordingly, the wear experienced by the plug provides an accurate measure for the wear in a gun barrel when a projectile is actually fired through the same.
- Another more specific object of the invention is to provide a novel and improved testing method of the general kind above referred to which yields fully satisfactory measuring data from comparatively few test firings.
- Ten test firings are generally suflicient.
- a somewhat greater number of test firings may be advisa-' ble, such as tento twenty test firings, but in any case, very much less than were heretofore necessary when tests were carried out by firing projectiles through a barrel.
- the method and the plug according to the invention may be used for gun barrels of all calibers, but it is particularly suitable for calibers above 20 millimeters.
- a plug having a hole therethrough and made of the same material as the barrel, the wear of which is to be measured and also a projectile having a lengthwise hole therethrough.
- the plug is weighed and then secured in the projectile in a position in which the hole in the plug and the hole in the projectile are in lengthwise alignment thereby providing a continuing channel extending through the length of the projectile.
- the projectile with the plug inserted therein is thereupon fired through the gun barrel by the action of propellant gases. The plug is then removed from the projectile and again weighed.
- the difference in the weight of the plug before and after firing as caused by the flow of gases through the channel in the plug and the projectile is accurately indicative of the Wear in barrels to be tested when projectiles are fired through the same by means of the propellant gases used for the test firings.
- the figure shows an elongated preferably solid projectile 1 through which extends an axial bore 2.
- This hole is partly widened at to accommodate a plug 4 which is made of the same material as the gun barrel which it is intended to test with respect to erosion due to thermal and mechanical wear.
- a lengthwise hole 3 through the plug is in alignment with the hole 2 through the projectile to form a continuous channel extending through the length of the body of the projectile.
- the outer wall of the plug is preferably tapered toward the nose of the projectile and the widened wall portion 5 of hole 2 is correspondingly shaped.
- the plug is inserted into the projectile from the rear end thereof and secured in position by suitable retaining means such as an externally threaded ring 6 which is screwed into a recess 7 formed in the rear end face of the projectile.
- suitable retaining means such as an externally threaded ring 6 which is screwed into a recess 7 formed in the rear end face of the projectile.
- An erosion test according to the invention is carried out as follows:
- the weight of the plug is ascertained.
- the plug is then inserted into the widened hole portion 5 and secured in the projectile by means of screw ring 6.
- the projectile with a plug inserted therein is then inserted into the chamber of the gun barrel to be tested and a supply of suitable propellant material is placed behind the plug.
- the propellant material may be placed in a cartridge case to which the projectile is secured.
- the described test projectile and plug may be assembled in substantially the same manner as any round of ammunition.
- the projectile is fired through the barrel by igniting the propellant in a conventional manner and the flow of propellant gases will cause the same wear in the barrel as it is caused by firing a conventional projectile through the same.
- the action of the propellant gases upon the inner wall of the hole 3 in the plug when flowing through the same will have exactly the same wear characteristics as they have upon the inner wall of the barrel.
- the inner wall surface of the, test plug will be subjected to exactly the same gas flow as the inner wall surface of the barrel.
- test projectile After firing the projectile, the same is recovered, the plug is removed and again weighed. The difference in weight before and after firing then constitutes a true measure of the thermal wear experienced by the barrel. If it be desired, a test projectile with a test plug inserted therein may be fired several times before the plug is removed and weighed.
- the method of the invention and the device for carrying out the method also constitute simple and economical means of testing and comparing different types of propellant materials without the necessity of carrying out the aforedescribed very expensive and time consuming conventional testing operations.
- a method of measuring the Wear in a barrel due to the firing of a projectile by the action of propellant gases comprising the steps of providing a plug having a hole therethrough and being made of the same Ina-- terial as the barrel the wear of which is to be measured and a projectile having a lengthwise hole therethrough; weighing the plug; securing the plug in the projectile in a position in which the holes in the plug and the projectile are in lengthwise alignment thereby providing a continuing channel through the projectile; firing the projectile with the plug inserted therein through the barrel by the action of propellant gases; and weighing. the plug again after firing whereby the difference in the weight of the plug before and after firing is indicative of the wear experienced by the barrel due to the action of the propellant gases.
- a device for measuring the wear in a barrel due to the firing of a projectile by the action of propellant gases comprising a projectile having a hole therethrough, and a test plug having a hole therethrough and made of the same material as the barrel the wear of which is to be tested, said plug being detachably secured in said projectile in a position in which the hole in the projectile and the hole in the plug are in alignment to provide a continuing lengthwise channel through the projectile and the plug.
- a device for measuring the wear in a barrel due to the firing of a projectile by the action of propellant gases comprising an elongated projectile having a lengthwise hole therethrough, and an elongated plug having an axial hole therethrough and made of the same material as the barrel the wear of which is to be tested, said plug being detachably secured in said projectile in a position in which the holes through the projectile and the plug are in lengthwise alignment to form a continuous lengthwise channel through the projectile and the plug.
- a device for measuring the wear in a barrel due to the firing of a projectile by the action of propellant gases comprising a plug having a hole therethrough and made of the same material as the barrel the wear of which is to be measured, an elongated projectile having in its rear end wall a recess and an axial hole extending from said recess throughout the length of the projectile, said plug being inserted into said hole of the projectile in a position in which the holes in the plug and the projectile are in axial alignment, and retaining means fitted in said recess for detachably retaining said plug in the recess.
- a device wherein said plug is tapered towards the nose of the projectile, said hole in the projectile including a widened tapered portion to accommodate said tapered plug with a close fit.
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Aiming, Guidance, Guns With A Light Source, Armor, Camouflage, And Targets (AREA)
- A Measuring Device Byusing Mechanical Method (AREA)
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE421364 | 1964-04-06 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3327518A true US3327518A (en) | 1967-06-27 |
Family
ID=20263728
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US432617A Expired - Lifetime US3327518A (en) | 1964-04-06 | 1965-02-15 | Method of and device for measuring the wear in a gun barrel |
Country Status (4)
Country | Link |
---|---|
US (1) | US3327518A (de) |
CH (1) | CH428264A (de) |
DE (1) | DE1213644B (de) |
GB (1) | GB1032335A (de) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3677063A (en) * | 1970-09-18 | 1972-07-18 | Us Army | Apparatus for laboratory simulation of ballistic field testing |
RU2653948C2 (ru) * | 2016-05-24 | 2018-05-15 | Федеральное государственное военное казённое образовательное учреждение высшего профессионального образования "Военная академия материально-технического обеспечения имени генерала армии А.В. Хрулева" | Датчик износа направляющих вкладышей обойменной люльки артиллерийского орудия |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4686854A (en) * | 1981-06-18 | 1987-08-18 | Drew Chemical Corporation | Process and apparatus for measuring corrosion rate of a heat transfer surface |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2478659A (en) * | 1944-11-18 | 1949-08-09 | Battelle Memorial Institute | Apparatus for erosion testing |
-
1964
- 1964-11-02 CH CH1416864A patent/CH428264A/de unknown
- 1964-11-17 DE DEA47618A patent/DE1213644B/de active Pending
-
1965
- 1965-02-15 US US432617A patent/US3327518A/en not_active Expired - Lifetime
- 1965-04-02 GB GB14127/65A patent/GB1032335A/en not_active Expired
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2478659A (en) * | 1944-11-18 | 1949-08-09 | Battelle Memorial Institute | Apparatus for erosion testing |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3677063A (en) * | 1970-09-18 | 1972-07-18 | Us Army | Apparatus for laboratory simulation of ballistic field testing |
RU2653948C2 (ru) * | 2016-05-24 | 2018-05-15 | Федеральное государственное военное казённое образовательное учреждение высшего профессионального образования "Военная академия материально-технического обеспечения имени генерала армии А.В. Хрулева" | Датчик износа направляющих вкладышей обойменной люльки артиллерийского орудия |
Also Published As
Publication number | Publication date |
---|---|
DE1213644B (de) | 1966-03-31 |
GB1032335A (en) | 1966-06-08 |
CH428264A (de) | 1967-01-15 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
Boulkadid et al. | Temperature sensitivity of propellant combustion and temperature coefficients of gun performance | |
Parate et al. | A novel method for dynamic pressure and velocity measurement related to a power cartridge using a velocity test rig for water-jet disruptor applications | |
US3327518A (en) | Method of and device for measuring the wear in a gun barrel | |
US3863499A (en) | Simulating firing stresses in gun barrels | |
Boulkadid et al. | Influence of firing temperature on properties of gun propellants | |
US3374741A (en) | Spotting charge | |
Banerjee et al. | Effect of gun barrel wear on muzzle velocity of a typical artillery shell | |
Wren et al. | Influence of high loading density charge configurations on performance of electrothermal-chemical (ETC) guns | |
Mukhtar et al. | Comparative closed vessel firing-ballistic parameters evaluation for development of base bleed composite solid propellant | |
US2432539A (en) | Grenade launching tube and auxiliary cartridge therefor | |
US3103884A (en) | Cartridge for more nearly uniform projectile velocities | |
US3854331A (en) | Vented test barrel assembly for revolver ammunition | |
RU2235301C1 (ru) | Установка для испытаний изделий | |
US3024652A (en) | Device to measure maximum acceleration and deceleration forces in small arms projectile | |
RU175736U1 (ru) | Манометрическая бомба | |
Lissak | Ordnance and Gunnery: A Text-book Prepared for the Cadets of the United States Military Academy, West Point | |
Kagankiewicz | Statistical Approach in Determining Energy Ballistic Parameters of Gunpowder Contained in the 7.62× 39 mm Ammunition Based on Measuring the Development of Pressure in a Manometric Bomb | |
US3885293A (en) | Method of making vented test barrel assembly for revolver ammunition | |
Goga et al. | A quantitative method of comparative assessment of primers ignition performances | |
Baker | Laboratory Setback Activators and Explosive Suitability for Gun Launch | |
Schmidt et al. | Improvement of Barrel Weapons Interior Ballistic Model Using Dynamic Vivacity Function | |
Haak et al. | Basic investigations in a 70-mm firing simulator | |
Boulkadid et al. | Influence of Firing Temperature on Ballistic, Mechanical and Sensitivity of Gun Propellants | |
RU2731850C1 (ru) | Способ определения внутрибаллистических параметров разгона метаемых объектов в ствольных метательных установках | |
Davis et al. | Experimental study of the combustion processes in granular propellant beds |