US3795129A - Method of forging sintered articles of high density - Google Patents

Method of forging sintered articles of high density Download PDF

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Publication number
US3795129A
US3795129A US00219652A US3795129DA US3795129A US 3795129 A US3795129 A US 3795129A US 00219652 A US00219652 A US 00219652A US 3795129D A US3795129D A US 3795129DA US 3795129 A US3795129 A US 3795129A
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tool
forging
temperature
articles
article
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US00219652A
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English (en)
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S Goto
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    • 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
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/12—Both compacting and sintering
    • B22F3/14—Both compacting and sintering simultaneously

Definitions

  • This invention is characterized in that powdery articles, pre-shaped by a conventional method or by a specific method, are heated to a temperature of ll20 1200C, while a tool is pre-warmed to a temperature of from 80 to 120C and is maintained at this prewarming temperature.
  • the heated articles then are forged in the tool at a speed of 7 lm/second. forging, the finished forged article and the tool are separated rapidly by a separating apparatus provided on the forging machine.
  • US. Pat. No. 3,410,683 discloses the method whereby a molded article is heated to a temperature of about 750C 1 100C before it is re-pressed, and the press tool is pre-warmed to a temperature of 150C 350C and is maintained at this pre-warming temperature throughout the repressing operation, in order to keep the recrystallisation conditions of the article during re-processing constant.
  • the purpose of this method is to obtain precise finished articles by maintaining the temperature of the press tool high and by maintaining the temperature of article low or from 750C to 1 100C so as to reduce the temperature difference between the tool and the material, thereby avoiding temperature drop of the article as far as possible and thus increasing the fluidity of the material.
  • the lower temperature of the actually material results in lowering the fluidity and consequently lowering the degree of preciseness of the finished article.
  • the press tool is bulky, it is extremely difficult to maintain its temperature high.
  • the most important problem raised in hot forging is that during the processing of a highly heated article on the press tool, the surface temperature of the tool rises and the surface of tool is transformed due to thermal fatigue and wear.
  • a finished article, after separation from the tool, is cooled by compulsory cooling but it is difficult to prevent the rising of its temperature due to conduction of heat at the contact surface with the tool during processing.
  • the best way for forging a powdery substance is to process the heated substance as quickly as possible.
  • a faster tool speed and a shorter processing time improve the flow of the material of a preshaped sintered article, decrease the coefficient of kinetic friction and effect the uniform distribution of pressing force into every part of the finished article, with the result of uniform density.
  • the forging machine primarily used is an oil-pressure forging press of low processing speed (0.6m/second or lower). Presses such as the drop hammer, friction press, etc., work at the medium speed or 2 4m/second, and a forging machine of the upward pressurizing type works at the high speed of 7 lOm/second.
  • a forging machine having a high processing speed and a shorter tool separation time is used, for example, a forging machine of the KJ H series.
  • This type of forging machine belongs to the group of hammering machines of the upward pressurizing type. It works at a speed of 7 lOm/second and is equipped with a tool separating apparatus such as an ejector. It provides optimum conditions for obtaining the uniformly high density of the powdery article during forging because of the synchronization of the dropping of an upper tool and the rising of a lower tool.
  • a lubricant may be applied to the tool, instead of adding a lubricant to the powdery substance.
  • FIGURE is a microscopic photograph of a finished article forged in accordance with the present invention.
  • Pre-shaped powder Electrolytic iron powder Pressed powder density: 6.8g/cm Forging temperature: 1 180C Heating duration: 30 minutes (hydrogen atmosphere) Processing energy: 0.7 ton m
  • forged articles produced according to the present invention exhibit superior physical properties to conventionally forged articles.
  • a method for forging a sintered article having a high density comprising:
  • the forging tool of a forging machine of the type having an upper element and a lower element movable together in syncronization;
  • forging said heated pre-shaped powdery article by said pre-heated tool at a forging operating speed of ing is accomplished by a synchronized lowering of said upper element and raising of said lower element.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Powder Metallurgy (AREA)
  • Forging (AREA)
US00219652A 1971-10-07 1972-01-21 Method of forging sintered articles of high density Expired - Lifetime US3795129A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP46078909A JPS518616B2 (enrdf_load_stackoverflow) 1971-10-07 1971-10-07

Publications (1)

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US3795129A true US3795129A (en) 1974-03-05

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US00219652A Expired - Lifetime US3795129A (en) 1971-10-07 1972-01-21 Method of forging sintered articles of high density

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US (1) US3795129A (enrdf_load_stackoverflow)
JP (1) JPS518616B2 (enrdf_load_stackoverflow)
DE (1) DE2205493A1 (enrdf_load_stackoverflow)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3864809A (en) * 1973-03-29 1975-02-11 Int Nickel Co Process of producing by powder metallurgy techniques a ferritic hot forging of low flow stress
US3889350A (en) * 1971-03-29 1975-06-17 Ford Motor Co Method of producing a forged article from prealloyed water-atomized ferrous alloy powder
US4019239A (en) * 1973-09-26 1977-04-26 Hoganas Aktiebolag Method of producing magnetite article
WO1979000833A1 (en) * 1978-03-24 1979-10-18 Iit Res Inst Method of and apparatus for hot pressing particulates
US6110419A (en) * 1997-12-02 2000-08-29 Stackpole Limited Point contact densification
US20040005237A1 (en) * 2000-07-20 2004-01-08 Fuping Liu Post-delubrication peening for forged powder metal components

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50134774U (enrdf_load_stackoverflow) * 1974-04-23 1975-11-06
JPS52155314U (enrdf_load_stackoverflow) * 1976-05-21 1977-11-25
JPS58171238U (ja) * 1982-05-11 1983-11-15 株式会社クボタ 流体エネルギ−ミル
JPS6064647A (ja) * 1983-09-19 1985-04-13 フロイント産業株式会社 コ−チング方法および装置
JPS61100164A (ja) * 1984-10-24 1986-05-19 Meiji Milk Prod Co Ltd 花粉の粉砕方法
JPH022909U (enrdf_load_stackoverflow) * 1988-06-09 1990-01-10

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2757446A (en) * 1952-06-04 1956-08-07 Gen Motors Corp Method of manufacture of articles from metal powders
US2821016A (en) * 1955-03-03 1958-01-28 William M Dickson Method of hot forging or extruding metal shapes and lubricant for use in hot forging and extruding operations
US3605245A (en) * 1968-11-26 1971-09-20 Krebsoege Gmbh Sintermetall Process for manufacturing high density press-formed articles
US3645728A (en) * 1970-06-03 1972-02-29 Gen Motors Corp Method for making spark plug shells

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2757446A (en) * 1952-06-04 1956-08-07 Gen Motors Corp Method of manufacture of articles from metal powders
US2821016A (en) * 1955-03-03 1958-01-28 William M Dickson Method of hot forging or extruding metal shapes and lubricant for use in hot forging and extruding operations
US3605245A (en) * 1968-11-26 1971-09-20 Krebsoege Gmbh Sintermetall Process for manufacturing high density press-formed articles
US3645728A (en) * 1970-06-03 1972-02-29 Gen Motors Corp Method for making spark plug shells

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3889350A (en) * 1971-03-29 1975-06-17 Ford Motor Co Method of producing a forged article from prealloyed water-atomized ferrous alloy powder
US3864809A (en) * 1973-03-29 1975-02-11 Int Nickel Co Process of producing by powder metallurgy techniques a ferritic hot forging of low flow stress
US4019239A (en) * 1973-09-26 1977-04-26 Hoganas Aktiebolag Method of producing magnetite article
WO1979000833A1 (en) * 1978-03-24 1979-10-18 Iit Res Inst Method of and apparatus for hot pressing particulates
US4244738A (en) * 1978-03-24 1981-01-13 Samuel Storchheim Method of and apparatus for hot pressing particulates
US6110419A (en) * 1997-12-02 2000-08-29 Stackpole Limited Point contact densification
US20040005237A1 (en) * 2000-07-20 2004-01-08 Fuping Liu Post-delubrication peening for forged powder metal components

Also Published As

Publication number Publication date
JPS4842905A (enrdf_load_stackoverflow) 1973-06-21
JPS518616B2 (enrdf_load_stackoverflow) 1976-03-18
DE2205493A1 (de) 1973-05-03

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