US3674390A - Production of metal strip from metal powder - Google Patents

Production of metal strip from metal powder Download PDF

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Publication number
US3674390A
US3674390A US58587A US3674390DA US3674390A US 3674390 A US3674390 A US 3674390A US 58587 A US58587 A US 58587A US 3674390D A US3674390D A US 3674390DA US 3674390 A US3674390 A US 3674390A
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US
United States
Prior art keywords
powder
hopper
metal
strip
end walls
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
US58587A
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English (en)
Inventor
George Mchardy Sturgeon
George Jackson
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.)
British Iron and Steel Research Association BISRA
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British Iron and Steel Research Association BISRA
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 British Iron and Steel Research Association BISRA filed Critical British Iron and Steel Research Association BISRA
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Publication of US3674390A publication Critical patent/US3674390A/en
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Expired - Lifetime legal-status Critical Current

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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
    • B22F3/18—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces by using pressure rollers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S425/00—Plastic article or earthenware shaping or treating: apparatus
    • Y10S425/02—Fluidized bed

Definitions

  • This invention relates to the production of metal strip by the compaction of metal powder.
  • Metal powders can be formed into strip material by supplying the powder to the nip of compacting rolls where the powder is subjected to sufiicient pressure to form a self-supporting strip (commonly termed green strip) and subsequently heating the strip to sinter the metal particles. Thereafter the sintered metal strip may be subjected to mechanical and/or thermal treatment to modify and, in particular, to improve its mechanical properties.
  • a self-supporting strip commonly termed green strip
  • the sintered metal strip may be subjected to mechanical and/or thermal treatment to modify and, in particular, to improve its mechanical properties.
  • hot metal powder may be supplied to the roll nip so that thermal treatment occurs simultaneously with compaction.
  • One method is to maintain a heap of powder above the nip of the compacting rolls (the powder flowing into the roll nip assisted by the rotation of the rolls) by means of a hopper which may be defined by two longitudinal walls lying parallel to the axis of the rolls, the lower edges of which bear against the curved surface of the rolls, and two end walls lying transverse to the axis of the rolls, the lower ends of which bear against the ends of the rolls.
  • the enclosure and the upper parts of the curved surfaces of the compacting rolls form, in effect, a hopper for the powder.
  • the powder is generally supplied to the hopper by a mechanical conveyor or pneumatically.
  • One of the main problems in producing satisfactory green strip for further processing into cold rolled strip is to ensure that the mass per unit area across its width is constant and it is an object of this invention to reduce this problem.
  • the present invention comprises an apparatus for use in the production of metal strip from metal powder including compacting rolls, a hopper for directing powder to the nip between the rolls, characterised in that the hopper has end walls (i.e. Walls transverse to the rolls) with means for forming a layer of pressurised gas on the inside of the end walls whereby to reduce the friction between the end walls and powder in the hopper.
  • the hopper end walls include a portion of porous material through which gas can be passed.
  • the present invention also comprises a process for the production of metal strip from metal powder in which metal powder is supplied to the nip of compacting rolls from a hopper, characterised in that a layer of pressurised gas is formed on the inside of the end walls (i.e. walls transverse to the rolls) of the hopper to reduce the friction between the end walls and powder in the hopper.
  • FIG. 1 is a perspective view of one embodiment of apparatus according to the invention.
  • FIG. 2 is an elevation of one end wall of the hopper seen from inside the hopper
  • FIG. 3 is a part view of section lII--III (see FIG. 2) across the hopper.
  • the apparatus comprises a pair or horizontally disposed, parallel, compacting rolls 10 and 11 which are driven by means (not shown) in the directions indicated by the arrows.
  • a hopper 12 made up of two longitudinal walls 13, 14, the lower edges of which bear against the curved surfaces of the rolls 10, 1 1 respectively and two end walls 15, 16, the end wall 15 being broken away in FIG. 1, the lower ends of which bear against the ends of the rolls 10, 11 (see FIGS. 2 and 3).
  • a container 17 for a fluidised bed of metal powder Positioned above the hopper 12 is a container 17 for a fluidised bed of metal powder; the bottom of the container is provided with an inlet 18, for gas to maintain the bed in a fluidised condition.
  • One side, 19, of the container 17 is positioned vertically above and parallel to the nip formed between the rolls 10 and 11 and extends over the length of the nip; side 19 forms a weir over which the fluidised metal powder can flow and then fall into the hopper as more fully described in our application Ser. No. 58,586, filed July 27, 1970.
  • the end wall 16 (the end wall 15 being exactly similar) comprises a central portion 22 formed of a porous or foraminous material. Suitable materials include, for example, porous ceramic materials, porous sintered metal sheet and metal sheet having a large number of small holes in it.
  • the central portion '22 is covered on the outside (that is on the outside relative to the hopper) by a gas-tight jacket 25 which is provided with a gas inlet 26.
  • the bottom portion 27 of the wall i.e. that portion adjacent the roll nip, is preferably formed solid.
  • metal powder is supplied to the container 17 and flows over the weir 19 into the hopper 12.
  • Gas for example air, is passed via the gas inlets 26 to the porous part ofthe hopper end walls 22 and forms a gaseous cushion on the inside of the hopper end walls 15, 16 thereby reducing the tendency of the powder to stick to the hopper end walls.
  • the powder thus flows into the end portions of the nip at the same rate as into the rest of the nip and then compacted to form a strip.
  • the powder compacting processes and apparatus of the invention can be used in the compaction of cold powder to form green strip and also in the compaction of hot powder.
  • apparatus for use in the production of metal strip from metal powder including compacting rolls and a hopper for directing powder to the nip between the rolls, the improvement in which comprises hopper end walls transverse to the rolls having means for forming a layer of pressurised gas on the inside of the end walls where by to reduce the friction between the end walls and powder in the hopper.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Powder Metallurgy (AREA)
US58587A 1969-08-06 1970-07-27 Production of metal strip from metal powder Expired - Lifetime US3674390A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3932869 1969-08-06

Publications (1)

Publication Number Publication Date
US3674390A true US3674390A (en) 1972-07-04

Family

ID=10408969

Family Applications (2)

Application Number Title Priority Date Filing Date
US58587A Expired - Lifetime US3674390A (en) 1969-08-06 1970-07-27 Production of metal strip from metal powder
US58586A Expired - Lifetime US3674389A (en) 1969-08-06 1970-07-27 Apparatus for production of metal strip from metal powder

Family Applications After (1)

Application Number Title Priority Date Filing Date
US58586A Expired - Lifetime US3674389A (en) 1969-08-06 1970-07-27 Apparatus for production of metal strip from metal powder

Country Status (6)

Country Link
US (2) US3674390A (en, 2012)
JP (1) JPS501335B1 (en, 2012)
DE (2) DE2039015C3 (en, 2012)
FR (2) FR2056650A5 (en, 2012)
GB (1) GB1304006A (en, 2012)
SE (2) SE367559B (en, 2012)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2343003A1 (de) * 1972-10-02 1974-04-18 Ibm Vorrichtung zum einbringen eines elektrisch leitenden pulvers in buchsen eines elektrischen steckers
US4041595A (en) * 1976-06-01 1977-08-16 Wanskuck Company Extrusion process
USD568793S1 (en) 2007-04-19 2008-05-13 Precision Polymers, Llc Travel trailer
CN106312072A (zh) * 2015-06-26 2017-01-11 鞍钢股份有限公司 一种粉末带材用轧辊及其轧制方法

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2124227B1 (en, 2012) * 1971-02-01 1975-02-07 Mambretti Giancarlo
CH524451A (de) * 1971-06-24 1972-06-30 Alusuisse Verfahren und Vorrichtung zum kontinuierlichen Herstellen eines Stranges aus kleinteiliger Masse
CA1008623A (en) * 1972-02-11 1977-04-19 Gould Inc. Process and apparatus for manufacture of an electrode
DE4114081A1 (de) * 1991-04-30 1992-11-05 Buehler Ag Flockierwalzwerk

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2343003A1 (de) * 1972-10-02 1974-04-18 Ibm Vorrichtung zum einbringen eines elektrisch leitenden pulvers in buchsen eines elektrischen steckers
US4041595A (en) * 1976-06-01 1977-08-16 Wanskuck Company Extrusion process
USD568793S1 (en) 2007-04-19 2008-05-13 Precision Polymers, Llc Travel trailer
CN106312072A (zh) * 2015-06-26 2017-01-11 鞍钢股份有限公司 一种粉末带材用轧辊及其轧制方法

Also Published As

Publication number Publication date
JPS501335B1 (en, 2012) 1975-01-17
FR2056650A5 (en, 2012) 1971-05-14
US3674389A (en) 1972-07-04
GB1304006A (en, 2012) 1973-01-24
DE2039016B2 (de) 1978-06-15
SE367559B (en, 2012) 1974-06-04
DE2039015C3 (de) 1978-10-19
DE2039015A1 (de) 1971-02-18
SE366235B (en, 2012) 1974-04-22
FR2056649A5 (en, 2012) 1971-05-14
DE2039015B2 (de) 1978-02-16
DE2039016C3 (de) 1979-02-15
DE2039016A1 (de) 1971-02-18

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