US2979810A - Rotating bands for projectiles and methods for making the same - Google Patents

Rotating bands for projectiles and methods for making the same Download PDF

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Publication number
US2979810A
US2979810A US652686A US65268657A US2979810A US 2979810 A US2979810 A US 2979810A US 652686 A US652686 A US 652686A US 65268657 A US65268657 A US 65268657A US 2979810 A US2979810 A US 2979810A
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US
United States
Prior art keywords
projectiles
rotating bands
iron
making
rotating
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
US652686A
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English (en)
Inventor
Hansen Friedrich
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Application granted granted Critical
Publication of US2979810A publication Critical patent/US2979810A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B14/00—Projectiles or missiles characterised by arrangements for guiding or sealing them inside barrels, or for lubricating or cleaning barrels
    • F42B14/02—Driving bands; Rotating bands
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
    • B22F1/14—Treatment of metallic powder
    • B22F1/145—Chemical treatment, e.g. passivation or decarburisation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
    • B22F1/17—Metallic particles coated with metal
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/02—Making ferrous alloys by powder metallurgy
    • C22C33/0207—Using a mixture of prealloyed powders or a master alloy
    • C22C33/0228—Using a mixture of prealloyed powders or a master alloy comprising other non-metallic compounds or more than 5% of graphite

Definitions

  • the present invention relates to rotating bands for projectiles.
  • said bands have been generally made of copper.
  • This metal has physical characteristics which comply particularly well with the requirements for rotating bands.
  • copper is a relatively rare and expensive metal and it is desirable to be able to replace it by other materials. This is why rotating bands for projectiles have been made of soft iron and in particular sintered iron and such rotating bands have proved to be satisfactory for an average and high shell velocities and firing rates.
  • the object of my invention is to provide a rotating band for projectiles which is free from these drawbacks.
  • the rotating band according to my inven tion is essentially constituted by a soft nitrided iron powder sintered to the designed shape.
  • I add to said powder from 0.8 to 2.0% by weight of copper to the iron powder.
  • this copper is added by subjecting the iron powder to a chemical copper depositing treatment.
  • Example An iron powder suitable for sintering and having for instance a grain size ranging from 0.1 to 0.15 mm. in diameter is treated in a stream of ammonia gas at a temperature ranging from 300 to 400 C.
  • the powder undergoing this treatment is stirred by the gaseous stream which forms eddies in the treatment chamber and if the treatment is performed in this way, it may be completed in about fifteen minutes.
  • the iron powder thus treated is chemically coated with copper.
  • a protective gas such as nitrogen
  • Rotating bands obtained as above stated can be machined without difficulties if it is found necessary.
  • a process of making a rotating band for a projectile comprising forming a mass of substantially pure iron powder of suitable character for sintering, contacting the mass of powder with gaseous ammonia at a temperature of about 300400 C, to soft nitride the powder, and compacting and sintering the soft nitrided iron powder to the shape of said rotating band.
  • a rotating band for a projectile made by the process of claim 1.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
  • Powder Metallurgy (AREA)
US652686A 1956-04-15 1957-04-15 Rotating bands for projectiles and methods for making the same Expired - Lifetime US2979810A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH812235X 1956-04-15

Publications (1)

Publication Number Publication Date
US2979810A true US2979810A (en) 1961-04-18

Family

ID=4538600

Family Applications (1)

Application Number Title Priority Date Filing Date
US652686A Expired - Lifetime US2979810A (en) 1956-04-15 1957-04-15 Rotating bands for projectiles and methods for making the same

Country Status (7)

Country Link
US (1) US2979810A (de)
BE (1) BE556476A (de)
CH (1) CH346460A (de)
DE (1) DE1036114B (de)
FR (1) FR1171194A (de)
GB (1) GB812235A (de)
NL (2) NL99102C (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3256818A (en) * 1955-11-26 1966-06-21 Berghaus Bernhard Method of reducing barrel wear
SE441305B (sv) * 1979-03-07 1985-09-23 Bofors Ab Sett att festa en projektils gordel medelst friktionssvetning

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2323162A (en) * 1940-11-26 1943-06-29 Gen Motors Corp Flatiron base
US2411073A (en) * 1944-08-16 1946-11-12 Isthmian Metals Inc Making products of iron or iron alloys
US2483075A (en) * 1944-12-15 1949-09-27 New Jersey Zinc Co Method of copper coating iron particles
US2666724A (en) * 1952-12-03 1954-01-19 Gen Aniline & Film Corp Process of preparing iron powder of improved electromagnetic properties
US2812276A (en) * 1953-06-29 1957-11-05 Int Nickel Co High frequency cores

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2323162A (en) * 1940-11-26 1943-06-29 Gen Motors Corp Flatiron base
US2411073A (en) * 1944-08-16 1946-11-12 Isthmian Metals Inc Making products of iron or iron alloys
US2483075A (en) * 1944-12-15 1949-09-27 New Jersey Zinc Co Method of copper coating iron particles
US2666724A (en) * 1952-12-03 1954-01-19 Gen Aniline & Film Corp Process of preparing iron powder of improved electromagnetic properties
US2812276A (en) * 1953-06-29 1957-11-05 Int Nickel Co High frequency cores

Also Published As

Publication number Publication date
FR1171194A (fr) 1959-01-22
NL99102C (de)
CH346460A (de) 1960-05-15
GB812235A (en) 1959-04-22
BE556476A (de)
DE1036114B (de) 1958-08-07
NL216283A (de)

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