CA2613696A1 - Accurate non-lead frangible bullet - Google Patents
Accurate non-lead frangible bullet Download PDFInfo
- Publication number
- CA2613696A1 CA2613696A1 CA 2613696 CA2613696A CA2613696A1 CA 2613696 A1 CA2613696 A1 CA 2613696A1 CA 2613696 CA2613696 CA 2613696 CA 2613696 A CA2613696 A CA 2613696A CA 2613696 A1 CA2613696 A1 CA 2613696A1
- Authority
- CA
- Canada
- Prior art keywords
- frangible
- jacket
- core
- metal particles
- natural rubber
- 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.)
- Abandoned
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
- F42B8/00—Practice or training ammunition
- F42B8/12—Projectiles or missiles
- F42B8/14—Projectiles or missiles disintegrating in flight or upon impact
-
- 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
- F42B12/02—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect
- F42B12/20—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect of high-explosive type
- F42B12/22—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect of high-explosive type with fragmentation-hull construction
- F42B12/32—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect of high-explosive type with fragmentation-hull construction the hull or case comprising a plurality of discrete bodies, e.g. steel balls, embedded therein or disposed around the explosive charge
-
- 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
- F42B12/74—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the material of the core or solid body
-
- 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
Abstract
A non-toxic, highly frangible accurate projectile constructed with a frangible bullet jacket and a frangible internal core. Both jacket and core are constituted from metals particles which are blended in a liquid natural rubber binder, compressed or swaged and heated till cured.
The jacket and core are then formed into a projectile using conventional bullet manufacturing procedures and equipment.
The jacket and core are then formed into a projectile using conventional bullet manufacturing procedures and equipment.
Description
Specification 1. Field of the Invention This invention relates to a highly frangible non-toxic accurate projectile used in small arms applications and to the method for making it.
2. Description of the Previously Published Art It is desirable to manufacture a highly frangible projectile fired at over 3000 feet per second that do not damage a steel plate manufactured from AR500 steel having a thickness of 3/8 of an inch and V2 of an inch. It is also desirable that the frangible projectile have at least an accuracy of two minutes of angle at 100 meters.
The projectile must have enough strength in its composition that it does not break apart while passing through the barrel of a firearm having a rate of twist 7 to 1.
Currently, frangible projectiles fired at high velocities such as 3000 feet per second do damage steel plates made with AR500 steel and have accuracies substantially more than two minute of angle at 100 meters.
OBJECTS OF THE INVENTION
It is an object of this invention to provide a highly frangible, accurate non-toxic projectile which does not damage steel plates constructed out of AR500 steel when shot at velocities over 3000 feet per second, constructed with a frangible jacket and frangible core that are separately made from metal particles mixed in liquid natural rubber, swaged and cured to a desired hardness and strength.
It is further objvct of this invention to provide a process for making a non-toxic, highly frangible accurate projectile using standard conventional bullet assembly machinery.
These and furC~pr q~ppts of this invention will become more apparent as the description of the invention propq eds, SUMMARY OF THE INVENTION
The foregoing and further objects and advantages are obtained by manufacturing a frangible, accurate projectile using a frangible jacket and frangible core separately made from metal particles mixed with liquid natural rubber, swaged and cured to a desired hardness.
The frangible bullet jacket and core are assembled into a highly frangible, accurate projectile using conventional bullet assembly equipment.
BRIEF DESCRIPTION OF THE DRAWINGS
In the accompany drawings, FIG. 1 is a cross-sectional view of a frangible jacket FIG. 2 is a cross-sectional view of a frangible core FIG. 3 is a cross-sectional view of a seated frangible core inside a frangible jacket FIG. 4 is a cross-sectional view of a frangible projectile described in the invention DESCRIPTION OF THE PREFERRED EMBODIMENTS
The current invention achieves the desired results by first constructing a frangible bullet jacket out of metal particles that are mixed in curable liquid natural rubber. The metal particles may be of one type metal or a combination of metals. Metals particles such as copper, bronze, brass, tin, zinc, iron, tungsten and bismuth are examples of suitable metal particles that can be utilized in the formation of the frangible bullet jacket. The metal particles may be powder, flakes or chips and a combination thereof. The liquid natural rubber should have a viscosity similar to skimmed milk to be most effective. There are suitable thinners that can be used to make the natural liquid rubber less viscose if desired.
Metal particles are mixed with a pre-determined amount of natural liquid rubber and 60 to 1 is a typical weight ratio of metal particles to liquid rubber. A suitable liquid rubber thinner may be added to the homogenous mixture if desired.
2. Description of the Previously Published Art It is desirable to manufacture a highly frangible projectile fired at over 3000 feet per second that do not damage a steel plate manufactured from AR500 steel having a thickness of 3/8 of an inch and V2 of an inch. It is also desirable that the frangible projectile have at least an accuracy of two minutes of angle at 100 meters.
The projectile must have enough strength in its composition that it does not break apart while passing through the barrel of a firearm having a rate of twist 7 to 1.
Currently, frangible projectiles fired at high velocities such as 3000 feet per second do damage steel plates made with AR500 steel and have accuracies substantially more than two minute of angle at 100 meters.
OBJECTS OF THE INVENTION
It is an object of this invention to provide a highly frangible, accurate non-toxic projectile which does not damage steel plates constructed out of AR500 steel when shot at velocities over 3000 feet per second, constructed with a frangible jacket and frangible core that are separately made from metal particles mixed in liquid natural rubber, swaged and cured to a desired hardness and strength.
It is further objvct of this invention to provide a process for making a non-toxic, highly frangible accurate projectile using standard conventional bullet assembly machinery.
These and furC~pr q~ppts of this invention will become more apparent as the description of the invention propq eds, SUMMARY OF THE INVENTION
The foregoing and further objects and advantages are obtained by manufacturing a frangible, accurate projectile using a frangible jacket and frangible core separately made from metal particles mixed with liquid natural rubber, swaged and cured to a desired hardness.
The frangible bullet jacket and core are assembled into a highly frangible, accurate projectile using conventional bullet assembly equipment.
BRIEF DESCRIPTION OF THE DRAWINGS
In the accompany drawings, FIG. 1 is a cross-sectional view of a frangible jacket FIG. 2 is a cross-sectional view of a frangible core FIG. 3 is a cross-sectional view of a seated frangible core inside a frangible jacket FIG. 4 is a cross-sectional view of a frangible projectile described in the invention DESCRIPTION OF THE PREFERRED EMBODIMENTS
The current invention achieves the desired results by first constructing a frangible bullet jacket out of metal particles that are mixed in curable liquid natural rubber. The metal particles may be of one type metal or a combination of metals. Metals particles such as copper, bronze, brass, tin, zinc, iron, tungsten and bismuth are examples of suitable metal particles that can be utilized in the formation of the frangible bullet jacket. The metal particles may be powder, flakes or chips and a combination thereof. The liquid natural rubber should have a viscosity similar to skimmed milk to be most effective. There are suitable thinners that can be used to make the natural liquid rubber less viscose if desired.
Metal particles are mixed with a pre-determined amount of natural liquid rubber and 60 to 1 is a typical weight ratio of metal particles to liquid rubber. A suitable liquid rubber thinner may be added to the homogenous mixture if desired.
After the homogenous mixture of metal particles and liquid natural rubber are mixed and all the volatiles of the liquid natural rubber have completely evaporated, a suitable dry lube is added to the dried homogenous mixture and .5% is a typical amount that is used.
The homogenous mixture of metal particles, dried liquid rubber and dry lube may be roller compacted in order to improve its flow rate properties.
The homogenous mixture does not have to be processed into jackets immediately as long as no heat is applied to the mixture.
The end of the internal punch of the jacket forming die may be flat or slightly hollow. If the end of the internal punch is flat, a flat base projectile will be formed, if the tip of the internal punch is hollow, a boat-tail projectile will therefore be formed.
The external punch of the jacket forming die will be tapered accordingly at its end in order to form a suitable cavity within the jacket. Any variance in the taper will create jackets that have different properties, for example variance in strength and weight.
A suitable amount of homogenous material is placed in a jacket forming or swaging die having a specified cavity diameter. The diameter of the jacket forming die will have a diameter less than the final diameter of the completed projectile in order to allow for any expansion of the formed jacket after curing. Typical expansion of the frangible jacket after curing is about .005 of an inch. It is therefore necessary to make the frangible jacket slightly smaller in diameter in order to allow for this expansion.
After a pre-determined amount of homogenous material is placed in the jacket forming die, the material is compressed or swaged within the jacket forming die. The applied pressure may vary between I to 50 tons depending on the diameter of the jacket being formed.
After the jacket is formed, the jacket is heated or cured to the desired hardness or frangibility. FIG. I
illustrates the frangible jacket 1 constructed with metal particles 3 mixed with cured liquid natural rubber 2.
It should be noted that is important that any projectiles of this invention made with frangible jackets of the described type have enough strength to withstand the forces created when shot out of a rifle having a rifling twist of 7 to 1. If the jacket of the above description is too frangible, the projectile will fracture while travelling through such a rifled barrel.
Also, the frangible jacket lips 9 should have enough flexibility in order to be bent at least 20 degrees to a maximum of 45 degrees. The ability of the frangible jacket to be bent in such a fashion will be useful in locking any core that is seated inside it. This will prevent any core seated inside the frangible jacket from becoming loose and effect accuracy in a negative way.
It was found that there are many factors that may influence the frangible jacket from having the required flexibility and frangibility.
The homogenous mixture of metal particles, dried liquid rubber and dry lube may be roller compacted in order to improve its flow rate properties.
The homogenous mixture does not have to be processed into jackets immediately as long as no heat is applied to the mixture.
The end of the internal punch of the jacket forming die may be flat or slightly hollow. If the end of the internal punch is flat, a flat base projectile will be formed, if the tip of the internal punch is hollow, a boat-tail projectile will therefore be formed.
The external punch of the jacket forming die will be tapered accordingly at its end in order to form a suitable cavity within the jacket. Any variance in the taper will create jackets that have different properties, for example variance in strength and weight.
A suitable amount of homogenous material is placed in a jacket forming or swaging die having a specified cavity diameter. The diameter of the jacket forming die will have a diameter less than the final diameter of the completed projectile in order to allow for any expansion of the formed jacket after curing. Typical expansion of the frangible jacket after curing is about .005 of an inch. It is therefore necessary to make the frangible jacket slightly smaller in diameter in order to allow for this expansion.
After a pre-determined amount of homogenous material is placed in the jacket forming die, the material is compressed or swaged within the jacket forming die. The applied pressure may vary between I to 50 tons depending on the diameter of the jacket being formed.
After the jacket is formed, the jacket is heated or cured to the desired hardness or frangibility. FIG. I
illustrates the frangible jacket 1 constructed with metal particles 3 mixed with cured liquid natural rubber 2.
It should be noted that is important that any projectiles of this invention made with frangible jackets of the described type have enough strength to withstand the forces created when shot out of a rifle having a rifling twist of 7 to 1. If the jacket of the above description is too frangible, the projectile will fracture while travelling through such a rifled barrel.
Also, the frangible jacket lips 9 should have enough flexibility in order to be bent at least 20 degrees to a maximum of 45 degrees. The ability of the frangible jacket to be bent in such a fashion will be useful in locking any core that is seated inside it. This will prevent any core seated inside the frangible jacket from becoming loose and effect accuracy in a negative way.
It was found that there are many factors that may influence the frangible jacket from having the required flexibility and frangibility.
A) metal particles utilized A) amount of curable liquid natural rubber mixed B) forming pressure C) amount of dry lube D) curing time E) curing temperature The internal core of the current invention is made with metal particles that are blended with curable liquid natural rubber. Metals particles such as copper, bronze, brass, tin, zinc, iron, tungsten and bismuth are examples of suitable metal particles that can be utilized in the formation of the frangible bullet core. The metal particles may be powder, flakes or chips and a combination thereof.
The liquid natural rubber should have a viscosity similar to skimmed milk to be most effective.
There are suitable thinners that can be used to make the natural liquid rubber less viscose if desired.
Metal particles are mixed with a pre-determined amount of natural liquid rubber and 30 to 1 is a typical weight ratio of metal particles to liquid natural rubber. A suitable liquid rubber thinner may be added to the homogenous mixture if desired.
After the homogenous mixture of metal particles and liquid natural rubber are mixed and all the volatiles of the liquid natural rubber have completely evaporated, a suitable dry lube is added to the dried homogenous mixture and .5% is a typical amount that is used.
The homogenous mixture of metal particles, the dried liquid natural rubber and dry lube may be roller compacted in order to improve its flow rate properties.
The homogenous mixture does not have to be processed into bullet cores immediately as long as no heat is applied to the mixture.
It should be noted that it is desirable that the frangible bullet core be weaker and substantially less flexible than the frangible bullet jacket. By increasing the liquid natural rubber ratio from 60/1to30 /1, the desired weaker core will be attained. It should also be noted that the density of the frangible core may not necessarily have the same density of the frangible jacket. Some core densities may be more suitable than other densities in certain applications. Densities are adjusted accordingly by the type of metal particles utilized, the amount of natural liquid rubber used and by the amount of pressure applied during the core swaging stage.
After a pre-determined amount of homogenous material is placed in the core forming die, the material is compressed or swaged within the core forming die and the desired shape is attained. The desired shape of the frangible bullet core should be close to the internal dimensions of the cavity within the frangible bullet jacket in which the cores will be inserted in. The amount of pressure applied for core manufacturing will be dependent on the frangible core diameter and the final core density that is required.
The liquid natural rubber should have a viscosity similar to skimmed milk to be most effective.
There are suitable thinners that can be used to make the natural liquid rubber less viscose if desired.
Metal particles are mixed with a pre-determined amount of natural liquid rubber and 30 to 1 is a typical weight ratio of metal particles to liquid natural rubber. A suitable liquid rubber thinner may be added to the homogenous mixture if desired.
After the homogenous mixture of metal particles and liquid natural rubber are mixed and all the volatiles of the liquid natural rubber have completely evaporated, a suitable dry lube is added to the dried homogenous mixture and .5% is a typical amount that is used.
The homogenous mixture of metal particles, the dried liquid natural rubber and dry lube may be roller compacted in order to improve its flow rate properties.
The homogenous mixture does not have to be processed into bullet cores immediately as long as no heat is applied to the mixture.
It should be noted that it is desirable that the frangible bullet core be weaker and substantially less flexible than the frangible bullet jacket. By increasing the liquid natural rubber ratio from 60/1to30 /1, the desired weaker core will be attained. It should also be noted that the density of the frangible core may not necessarily have the same density of the frangible jacket. Some core densities may be more suitable than other densities in certain applications. Densities are adjusted accordingly by the type of metal particles utilized, the amount of natural liquid rubber used and by the amount of pressure applied during the core swaging stage.
After a pre-determined amount of homogenous material is placed in the core forming die, the material is compressed or swaged within the core forming die and the desired shape is attained. The desired shape of the frangible bullet core should be close to the internal dimensions of the cavity within the frangible bullet jacket in which the cores will be inserted in. The amount of pressure applied for core manufacturing will be dependent on the frangible core diameter and the final core density that is required.
After the frangible cores are formed, the cores may be cured if desired. When the frangible cores are cured, the frangible cores will be slightly hardened which therefore may be more desirable in most applications. In most applications, the curing time for the core will be less than the curing time for the jacket and also the curing temperature will be less than the curing temperature of the jacket.
FIG.2 shows frangible core 4 constructed of metal particles 5 blended in cured liquid natural rubber 6.
FIG.3 shows seated frangible core inside frangible jacket FIG. 4 shows completed frangible projectile.
The current invention teaches that bullet manufacturing is achieved by utilizing conventional equipment.
Bullets manufacturing steps:
A) frangible jacket drops inside conventional bullet seating die B) frangible core is inserted inside cavity of frangible jacket C) frangible core is compressed or seated inside frangible jacket D) seated frangible core and jacket are extracted from bullet seating die E) seated frangible core and jacket are dropped inside conventional point-forming bullet die F) frangible projectile is formed in a conventional manner G) frangible projectile extracted from point-forming bullet die H) frangible projectile is polished and loaded into ammunition if desired.
Example A frangible bullet jacket was formed using metal particles mixed with 60 to 1 ratio by weight of curable liquid natural rubber. The weight of the jacket was recorded to be 85 grains, the diameter was .307 of an inch after curing.
A corresponding frangible core was formed using metal particles mixed with 30 to 1 by weight of curable liquid natural rubber. The weight of the frangible core was 35 grains after curing.
The frangible jacket and frangible core were formed into a 30 caliber projectile using conventional equipment. The total weight of the projectile was 120 grains. The projectile was loaded into a 30-06 casing and fired at a 10" by 10" AR500 steel plate at distance of 10 feet. The velocity was recorded to be 3115 feet per second and the twist of the barrel used was 1 to 7.
It was noted that there was no damage to the plate and the projectile broke up into very small pieces with no splash back of particles towards the shooter. Before the projectile struck the steel plate, the projectile had to penetrate a clear sheet of paper. There was no evidence on the paper that the projectile had broken up in any fashion while passing through the barrel of the firearm.
FIG.2 shows frangible core 4 constructed of metal particles 5 blended in cured liquid natural rubber 6.
FIG.3 shows seated frangible core inside frangible jacket FIG. 4 shows completed frangible projectile.
The current invention teaches that bullet manufacturing is achieved by utilizing conventional equipment.
Bullets manufacturing steps:
A) frangible jacket drops inside conventional bullet seating die B) frangible core is inserted inside cavity of frangible jacket C) frangible core is compressed or seated inside frangible jacket D) seated frangible core and jacket are extracted from bullet seating die E) seated frangible core and jacket are dropped inside conventional point-forming bullet die F) frangible projectile is formed in a conventional manner G) frangible projectile extracted from point-forming bullet die H) frangible projectile is polished and loaded into ammunition if desired.
Example A frangible bullet jacket was formed using metal particles mixed with 60 to 1 ratio by weight of curable liquid natural rubber. The weight of the jacket was recorded to be 85 grains, the diameter was .307 of an inch after curing.
A corresponding frangible core was formed using metal particles mixed with 30 to 1 by weight of curable liquid natural rubber. The weight of the frangible core was 35 grains after curing.
The frangible jacket and frangible core were formed into a 30 caliber projectile using conventional equipment. The total weight of the projectile was 120 grains. The projectile was loaded into a 30-06 casing and fired at a 10" by 10" AR500 steel plate at distance of 10 feet. The velocity was recorded to be 3115 feet per second and the twist of the barrel used was 1 to 7.
It was noted that there was no damage to the plate and the projectile broke up into very small pieces with no splash back of particles towards the shooter. Before the projectile struck the steel plate, the projectile had to penetrate a clear sheet of paper. There was no evidence on the paper that the projectile had broken up in any fashion while passing through the barrel of the firearm.
Claims (7)
1. A frangible projectile comprising; a frangible jacket made up of metal particles blended in curable liquid natural rubber, a frangible core made up of metal particles blended in curable liquid natural rubber.
2. The composition according to claim 1, wherein said metal particles comprise any one or more of the metals selected from the group consisting of copper, bronze, brass, tin, zinc, iron, tungsten and bismuth.
3. The composition according to claim 1, wherein said metal particles and curable liquid natural rubber used in the formation of the frangible jacket are mixed in a ratio of about 60:1 in parts by weight metal particles to parts by weight liquid natural rubber.
4. The composition according to claim 1, wherein said metal particles and curable liquid natural rubber used in the formation of the frangible core are mixed in a ratio of about 30:1 in parts by weight metal particles to parts by weight liquid natural rubber.
5. The composition according to claim 1, wherein the frangible jacket and the frangible core are cured separately.
6. The composition according to claim 1, wherein the curing time and temperature of the frangible jacket are different than the curing time and temperature of the frangible core.
7. The composition according to claim 1, wherein the viscosity of the curable liquid natural rubber has a viscosity similar to skimmed milk.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2613696 CA2613696A1 (en) | 2007-12-10 | 2007-12-10 | Accurate non-lead frangible bullet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2613696 CA2613696A1 (en) | 2007-12-10 | 2007-12-10 | Accurate non-lead frangible bullet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2613696A1 true CA2613696A1 (en) | 2009-06-10 |
Family
ID=40751109
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2613696 Abandoned CA2613696A1 (en) | 2007-12-10 | 2007-12-10 | Accurate non-lead frangible bullet |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2613696A1 (en) |
-
2007
- 2007-12-10 CA CA 2613696 patent/CA2613696A1/en not_active Abandoned
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |