US3786714A - Military bomb and method of making same - Google Patents
Military bomb and method of making same Download PDFInfo
- Publication number
- US3786714A US3786714A US00243744A US3786714DA US3786714A US 3786714 A US3786714 A US 3786714A US 00243744 A US00243744 A US 00243744A US 3786714D A US3786714D A US 3786714DA US 3786714 A US3786714 A US 3786714A
- Authority
- US
- United States
- Prior art keywords
- bomb
- composition
- tail
- bomb body
- military
- 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
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
- F42B25/00—Fall bombs
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
- F42B12/00—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material
- F42B12/72—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the material
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
- F42B12/00—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material
- F42B12/72—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the material
- F42B12/76—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the material of the casing
- F42B12/80—Coatings
Definitions
- the military bombs can be assembled and filled with explosive compositions in a vertical, nose down position and can be sealed with the present elastomeric tail pad while in that vertical position. In a short period the completed military bombs can be stacked horizontally or in any other disposition regardless of whether the explosive composition has congealed or not.
- non-volatile organic polyisocyanate
- compositions may be filled with inert particulate fillers such as silica, calcium carbonate, ground glass and the like and may include suitable extender oils.
- a typical military bomb includes a metal body or casing 11 having an internal lining 12 consisting of an asphaltic coating or a plastisol.
- the casing 11 has a nose well.13, plug wells 14, an activator well 15 and a tail opening 16.
- the wells 13, 14, 15, 16 are provided with threads to receive plugs or closures such as a nose plug 18, and a tail plug 19.
- a nose fuse 20 is connected to thetail plug 19.
- a nose conduit 22 and a tail conduit 23 connect the nose fuse 20 and the tail fuse 21 respectively to the activator well 15.
- the interior of the bomb casing 11 is filled with an explosive mass 25, for example, TN'T, tritonal, picratol.
- a resilient tail pad and seal 26 serves as a cap over the mass of explosive mate rial.
- the present invention is concerned with improvements in the tail pad and seal 26.
- the present improved tail pad consists of the thermoset reaction product of:
- the pad 26 adheres to the inner wall of the bomb casing 11. It may be desirable to include a primer on he inner wall of the bomb casing where the pad 26 is to be adhered.
- An excellent primer for this purpose is a reactive silicone.
- the pad 26 may also include inert particulate fillers.
- the military bomb tail pad and seal composition is formulated preferably from two storageable components which are identified for convenience as Component A and Component B.
- Component A includes hydroxy terminated polydiene and a suitable catalyst for the reaction of hydroxyl groups with isocyanate groups, for example, an alkyl tin catalyst.
- Component B includes a non-volatile organic polyisocyanate.
- the storageable components also include petroleum asphalt and/or plasticizer oil.
- the asphalt and some of the plasticizer mineral oil is provided in each of the components A and B in such proportions that the two components will have approximately equal volume and approximately equal viscosity.
- the composition will contain particulate extenders such as calcium carbonate, silica.
- the two Components A and B are shipped and stored separately until ready for use. Two components are mixed together as a thick fluid which is poured or extruded into the bomb casing after the explosive composition is introduced.
- the gel time or cure time of the composition may be regulated as desired in the manner hereinafter set forth.
- the explosive composition is introduced into the bomb casing while the bomb casing is maintained in a vertical position with the nose downwardly.
- the explosive composition normally is heated to a molten state prior to pouring into the military bomb casing.
- the present tail pad and seal can be poured on top of the molten explosive composition before or after the composition congeals. Alternatively, the present composition can be applied after the explosive composition has congealed. In the event a particulate explosive composition is employed, the present tail pad composition also has utility, serving to seal off inventory of explosive particles.
- the present tail pad and seal exhibits exceptional adhesive properties in its connection with the interior side walls of the casing 11.
- the present tail pad and seal after curing, is essentially inert to the explosive composition and to the materials of construction of the military bomb 10.
- the present tail pad and seal is cured essentially at room temperature and does not introduce any thennal hazards into the bomb assembly process.
- the present tail pad and seal has elasticity properties and compressibility properties which are eminently suitable to the requirements of a military bomb.
- the present tial pad and seal can be cured substantially completely to a thermoset condition in a predeterminable cure time, preferably ranging from about five minutes to about two hours. Cure time can be adjusted by varying the amount of catalyst and by adjusting the ratio of reactive to non-reactive components of the composition.
- the tail plug 19 When employing the present composition, the tail plug 19 may be inserted into the military bomb assembly prior to the complete cure of the tail pad. This capability facilitates the speed of bomb assembly completion.
- the bombs can be removed from the assembly area and stored vertically or horizontally or otherwise even where the explosive composition 25 has not completely congealed.
- the tail plug 19, upon insertion, may engage the tail pad and seal and be adhered in the assembly by such engagement.
- a typical overall composition, both Component A and Component B includes:
- polybutadiene resin hydroxy terminated, having a viscosity of 5,000-6,000 CPS at 86 F; a hydroxyl content of 0.80 meq/gm and an equivalent weight of about 1,250;
- Mondur-MR a polymethylene polyphenyl polyisocyanate having a functionality of approximately 4;
- dibutyl tin dilaurate which is a catalyst for the reaction between polyisocyanate and hydroxyl terminated polybutadiene resin.
- the hydroxyl terminated polydienes and their preparation are described in Canada Pat. No. 777,223.
- these diene polymers have primary hydroxyl groups and are formed from 1,3 -dienes having 4 to 12 carbon atoms.
- the initial dienes may be unsubstituted or 2-substituted or 2,3 disubstituted dienes.
- the hydroxyl functionality is preferably greater than 2, for example, from about 2.1 to about 2.6 although higher functionalities are permissible.
- the polyisocyanate is employed as a cross-linking agent for the diene polymers and is a material containing at least two isocyanate radicals.
- the polyisocyanate has a molecular weight greater than about 200 to minimize toxicity hazards.
- Useful polyisocyanates are 4, 4'-diphenylmethane diisocyanate, 1,5- naphthalene diisocyanate, phenylene diisocyanates, p, p'-diphenylmethane diisocyanate, hexamethylene diisocyanate.
- Polyarylene polyisocyanates are a preferred material.
- Isocyanate terminated prepolymers also can be employed as the polyisocyanate, for example, the reaction product of tolylene diisocyanate or other polyisocyanates sith dihydric or diamine terminated polyesters, polyethers or polyamides.
- the ratio of the polyisocyanate material to the hydroxyl terminated polydiene is such that there are about 0.5 to about 5 isocyanate groups per hydroxyl group of the diene polymer, and preferably from about 1.0 to 2.0 isocyanate groups per hydroxyl group of the polydiene ingredient.
- PETROLEUM ASPHALT EXTENDER Petroleum asphalts have been used as sealants in mi]- itary bombs. Their inertness is a useful property in the present tail pad composition.
- the asphalts for this purpose preferably have a ring and ball softening point of about l50180 F in order that the resulting composition will have a suitable hardness.
- the hardness or tackiness of the petroleum asphalt can be modified by the introduction of suitable plasticizers such as petroleum oils of the type normally used as rubber extender oils. The amount of plasticizer is determined by the desired hardness and tackiness in the resulting composition provided that excessive bleeding of the composition does not develop.
- PROPORTIONS The proportions of hydroxyl terminated polydiene resins and the polyisocyanate in the composition have already been discussed. These two ingredients together with the catalyst constitute a polyurethane rubber composition.
- the rubber composition can be extended with petroleum asphalt with or without plasticizers in an amount ranging from about 0.5 to about 2.0 times the weight of the polyurethane rubber composition.
- the present compositions are provided in two packages which can be admixed to produce the desired adhesive composition.
- the amount and type of catalyst is preferably selected to produce a cure time of 5 minutes to 2 hours.
- the polyisocyanate is combined with a portion of the petroleum asphalt in an ingredient mixture identified as Component B.
- the hydroxyl terminated polydiene resin is mixed with another portion of the petroleum asphalt and the catalyst and is identified as Component A.
- the mixtures A and B preferably have about equal volume and about equal viscosity to facilitate the mixing.
- the following ingredients are assembled:
- MIXTURE A MIXTURE B 300 grams Mondur-MR, a polyisocyanate based upon polyphenylene polymethylene 2,318 grams petroleum asphalt, the same material as provided in Mixture A 1,242 grams Tufflo-300 oil, a petroleum oil for Arco, Inc. Itmay be desirable to incorporate some molecular sieves (for example, Linde type 4A powder) in Mixture B prior to incorporating the polyisocyanate in order to tie up any available waterand increase the storage life of the resulting Component B.
- molecular sieves for example, Linde type 4A powder
- thermoset as employed herein is intended to comprehend the threedimensional character of the polymerization and is not intended to refer to any requirement foi heat dependency to achieve curing.
- One of the virtues of the present tail pad composition isthat it can be cured substantially without exotherm, thereby minimizing any possible hazards to the bomb making facility.
- the method of sealing a military bomb which comprises supporting the bomb body with its closed nose end facing downwardly and its open tail end facing upwardly;
- a reacting composition comprising: asphaltic filler; hydroxy terminated polydiene polymer; non-volatile organic polyisocyanate; a catalyst for the reaction between isocyanate groups and hydroxy groups;
Abstract
Description
Claims (2)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US8608970A | 1970-11-02 | 1970-11-02 | |
US24374472A | 1972-04-13 | 1972-04-13 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3786714A true US3786714A (en) | 1974-01-22 |
Family
ID=26774357
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US00243744A Expired - Lifetime US3786714A (en) | 1970-11-02 | 1972-04-13 | Military bomb and method of making same |
Country Status (1)
Country | Link |
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US (1) | US3786714A (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2494833A1 (en) * | 1980-11-25 | 1982-05-28 | Thomson Brandt | Friction welded seal caps for grenade casings - involving thin coatings pref. of polyvinylidene fluoride or chloride |
WO2007048521A1 (en) * | 2005-10-25 | 2007-05-03 | Rheinmetall Waffe Munition Gmbh | Explosive projectile |
WO2010145734A1 (en) * | 2009-05-25 | 2010-12-23 | Rheinmetall Waffe Munition Gmbh | Method for producing a large-calibre explosive projectile, and an explosive projectile produced using this method |
US20140331882A1 (en) * | 2011-12-14 | 2014-11-13 | Eurenco | Munition, charge for such a munition, and method of manufacturing such a munition |
US11391550B1 (en) * | 2016-12-15 | 2022-07-19 | The United States Of America, As Represented By The Secretary Of The Navy | Cook-off mitigation systems |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1316296A (en) * | 1919-09-16 | High-explosive shell | ||
US2733658A (en) * | 1956-02-07 | Explosive assembly | ||
US3243956A (en) * | 1963-07-15 | 1966-04-05 | Atlantic Res Corp | Flexible support |
-
1972
- 1972-04-13 US US00243744A patent/US3786714A/en not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1316296A (en) * | 1919-09-16 | High-explosive shell | ||
US2733658A (en) * | 1956-02-07 | Explosive assembly | ||
US3243956A (en) * | 1963-07-15 | 1966-04-05 | Atlantic Res Corp | Flexible support |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2494833A1 (en) * | 1980-11-25 | 1982-05-28 | Thomson Brandt | Friction welded seal caps for grenade casings - involving thin coatings pref. of polyvinylidene fluoride or chloride |
WO2007048521A1 (en) * | 2005-10-25 | 2007-05-03 | Rheinmetall Waffe Munition Gmbh | Explosive projectile |
WO2010145734A1 (en) * | 2009-05-25 | 2010-12-23 | Rheinmetall Waffe Munition Gmbh | Method for producing a large-calibre explosive projectile, and an explosive projectile produced using this method |
US8601950B2 (en) | 2009-05-25 | 2013-12-10 | Rheinmetall Waffe Munition Gmbh | Method for producing a large-caliber explosive projectile, and an explosive projectile produced using this method |
US8739671B2 (en) | 2009-05-25 | 2014-06-03 | Rheinmetall Waffe Munition Gmbh | Method for producing a large-caliber explosive projectile |
US20140331882A1 (en) * | 2011-12-14 | 2014-11-13 | Eurenco | Munition, charge for such a munition, and method of manufacturing such a munition |
US9476683B2 (en) * | 2011-12-14 | 2016-10-25 | Eurenco | Munition, charge for such a munition, and method of manufacturing such a munition |
US11391550B1 (en) * | 2016-12-15 | 2022-07-19 | The United States Of America, As Represented By The Secretary Of The Navy | Cook-off mitigation systems |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: EQUITABLE BANK, NATIONAL ASSOCIATION, AS AGENT Free format text: SECURITY INTEREST;ASSIGNOR:H.H. ROBERTSON COMPANY;REEL/FRAME:005261/0382 Effective date: 19891013 |
|
AS | Assignment |
Owner name: FIRST CITY SECURITIES INC., 499 PARK AVE., NEW YOR Free format text: SECURITY INTEREST;ASSIGNOR:H. H. ROBERTSON COMPANY;REEL/FRAME:005261/0098 Effective date: 19891013 |
|
AS | Assignment |
Owner name: WELLS FARGO BANK, N.A., A NATIONAL BANKING ASSOCIA Free format text: SECURITY INTEREST;ASSIGNOR:ROBERTSON CECO CORPORATION, A DE CORP.;REEL/FRAME:005617/0421 Effective date: 19901108 Owner name: WELLS FARGO BANK, N.A., A NATIONAL BANKING ASSOCIA Free format text: SECURITY INTEREST;ASSIGNOR:ROBERTSON-CECO CORPORATION, A DE CORP.;REEL/FRAME:005498/0434 Effective date: 19901108 Owner name: H. H. ROBERTSON, A CORP. OF DELAWARE, PENNSYLVANIA Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:FIRST CITY SECURITIES INC.;REEL/FRAME:005518/0137 Effective date: 19901106 Owner name: H. H. ROBERTSON, A CORP. OF DELAWARE, PENNSYLVANIA Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:MARYLAND NATIONAL BANK;REEL/FRAME:005518/0120 Effective date: 19901107 |
|
AS | Assignment |
Owner name: ROBERTSON-CECO CORPORATION, A DE CORP. Free format text: ASSIGNMENT OF ASSIGNORS INTEREST. EFFECTIVE NOVEMBER 8, 1990;ASSIGNOR:H.H. ROBERTSON COMPANY;REEL/FRAME:005587/0020 Effective date: 19901105 |