EP0754516A2 - Apparatus and method for continuously producing sintered metal fiber porous body - Google Patents

Apparatus and method for continuously producing sintered metal fiber porous body Download PDF

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Publication number
EP0754516A2
EP0754516A2 EP96111620A EP96111620A EP0754516A2 EP 0754516 A2 EP0754516 A2 EP 0754516A2 EP 96111620 A EP96111620 A EP 96111620A EP 96111620 A EP96111620 A EP 96111620A EP 0754516 A2 EP0754516 A2 EP 0754516A2
Authority
EP
European Patent Office
Prior art keywords
rollers
metal fiber
web
current
porous body
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.)
Withdrawn
Application number
EP96111620A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0754516A3 (enrdf_load_stackoverflow
Inventor
Masato Imamura
Kiichi Nakajima
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.)
Sintokogio Ltd
Original Assignee
Sintokogio Ltd
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 Sintokogio Ltd filed Critical Sintokogio Ltd
Publication of EP0754516A2 publication Critical patent/EP0754516A2/en
Publication of EP0754516A3 publication Critical patent/EP0754516A3/xx
Withdrawn legal-status Critical Current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
    • 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
    • B22F3/002—Manufacture of articles essentially made from metallic fibres
    • 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
    • B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy

Definitions

  • This invention relates to an apparatus and a method for continuously producing a sintered metal fiber porous body by pressing and simultaneously heating a metal fiber web.
  • the present invention is conceived considering the above drawbacks.
  • the purpose of the present invention is to provide an apparatus and a method that prevent the metal fibers of the web from fusing and adhering to the upper and lower rollers, and that supply a uniform electric current to the entire web.
  • the method of the present invention in a first aspect, is one to continuously produce a sintered metal fiber by pressing and simultaneously sintering a metal fiber web, wherein a metal fiber web is continuously inserted between a pair of current-conductive rollers, the surface of at least one roller being covered with graphite, while a predetermined current is supplied between the rollers through the web, thereby press-forming and sintering the metal fiber web.
  • a nip between the rollers is preset, and they are then rotated at a predetermined speed.
  • a power supply is provided between the upper and lower rollers to supply a current between them to sinter the metal fibers of the web.
  • a metal fiber web having a predetermined thickness and porosity is continuously inserted between the rollers. Since the surface of the rollers is coated with graphite, the web does not adhere to the surface. Further, since the current passes from one roller through the web to the other roller, the metal fiber web is heated and sintered. Thus a sintered metal fiber porous body having a desired porosity is continuously produced.
  • a metal fiber means a fiber made of any current-conductive metal, and that is coated with a stable oxide layer, and that has a cross-sectional area of 10 ⁇ m 2 - 10,000 ⁇ m 2 . If the cross-sectional area of the fiber of the web is less than 10 ⁇ m 2 , forming a web is difficult. If it is more than 10,000 ⁇ m 2 , the fiber does not shrink.
  • both rollers are coated with graphite.
  • at least one roller must be coated with graphite, and the other may be made of a current-conductive metal such as chrome copper, tungsten, a beryllium-copper alloy, etc.
  • a stainless steel wire mesh is used between the web and the roller made of a current-conductive metal.
  • a power source Is provided to supply a predetermined current between the rollers.
  • the magnitude of the current is determined per the size of the sintered body to be produced, and is also determined considering whether or not it can sinter the metal fibers. Therefore, preferably the value of the current is 4,000 - 20,000 A/8cm (8 cm is the length of the web), and the optimum value is 6,500 - 10,000 A/8cm (web length). If the current is less than 4,000 A/8m, the metal fibers are not sufficiently welded, and if it is more than 20,000 A/8cm, all the fibers are fused.
  • the pressure applied to the web is determined from the relation between the porosity of a metal fiber material web and the porosity of a sintered porous body produced from it.
  • the pressure is 10 - 130 Kgf per cm roll width. If it is less than 10 kgf/cm, the pore size of the sintered porous body becomes large, and the porous body becomes like a sponge. If the pressure is more than 130 kgf/cm, the sintered body is partially fused and welded. Generally, the optimum pressure is about 60 kgf/cm.
  • Fig. 1 is a partially cross-sectional view of the embodiment of the present invention.
  • Upper and lower rolls 1, 2 are disposed so that they can rotate on a vertical plane.
  • the upper roll 1 is supported for vertical movement by a downward-facing cylinder 3.
  • Each roller is 80 mm in width and 254 mm in diameter, and is made of chrome copper.
  • the surface of each roller is covered with graphite. Further, each roller is designed such that cooling water flows in it.
  • the upper and lower rollers 1, 2 are engaged by drive rollers 4, 5, respectively.
  • Metal fibers of a nominal size of 35 ⁇ m made by the coil strip cutting method made by cutting a 50 ⁇ m-thick thin plate with a lancing of 20 ⁇ m/rev) from heat-resistant stainless steel (a ferrite alloy that includes Cr-Al and rare earth elements, such as "liverlite” of Kawasaki Seitetsu Kabushikikaisha, "hekuralloy” of Registalloy Kabushikikaisha, etc.) were shaped to a plate by the roll-cutting method, and metal fiber webs 7, each having a weight of 900 g/m 2 , a size of 80 mm x 500 mm, and a thickness of 50 mm, were produced.
  • heat-resistant stainless steel a ferrite alloy that includes Cr-Al and rare earth elements, such as "liverlite” of Kawasaki Khatsu Kabushikikaisha, "hekuralloy” of Registalloy Kabushikikaisha, etc.
  • the pressing force of the cylinder 3 was set to 60 kgf/cm, and the speed of the upper and lower rollers 1, 2 was set to 2 m/min.
  • the drive rollers 4, 5 were driven to rotate the upper and lower rollers 1, 2, and cooling water was made to flow in them.
  • the metal fiber web was continuously inserted between the upper and lower rollers 1, 2 and was provided with a current by the seam welder 6, which was ON for 20 ms and then OFF for 20 ms, in a repeated current-loading-cycle.
  • Webs 7 were tested by varying the current from 10,000 to 18,000 A. With the current being between 10,000 and 18,000 A, the webs did not adhere to the surfaces of the rollers 1, 2, and good sintered porous bodies were obtained.
  • Metal fibers made by the coil strip cutting method from heat-resistant stainless steel (a ferrite alloy that includes Cr-Al and rare earth elements, such as "liverlite” of Kawasaki Seitetsu Kabushikikaisha, "hekuralloy” of Registalloy Kabushikikaisha, etc.) were shaped to a plate by the roll-cutting method, and three metal fiber webs 7 of weights of 600, 900, and 1200 g/m 2 , a size of 80 mm x 500 mm, and a thickness of 60 mm, were produced.
  • the pressing force of the cylinder 3 was set to 60 kgf/cm, and the speed of the upper and lower rollers was set to 2 m/min.
  • the drive rollers 4, 5 were driven to rotate the upper and lower rollers 1, 2.
  • the webs 7 were continuously inserted between the upper and lower rollers 1, 2, while the seam welder 6 was ON for 20 ms and then OFF for 20 ms, in a repeated current-loading cycle, to provide a current between the upper and lower rollers.
  • Tests to sinter the webs 7 were carried out by varying the current from 9,000 to 18,000 A. With the current being within this range, the webs 7 did not adhere to any surface of the upper and lower rollers, and good sintered porous bodies were obtained.
  • the third embodiment of the present invention is now explained.
  • an apparatus similar to that of the first embodiment was used to sinter a metal fiber web 7.
  • This apparatus differs from that of the first embodiment in that the surface of one of the upper and lower rollers was covered or coated with graphite, and the other roller was made of chrome copper. Further, a stainless steel (SUS304) wire mesh (#29) was disposed between the metal fiber web 7 and the roller that was made of chrome copper. Under these conditions, a good sintered porous body was obtained.
  • a metal fiber web 7 was inserted between a pair of rollers, the surface of at least one of the rollers being coated with graphite, while a predetermined electric current was made to flow from one roller through the web to the other roller.
  • the web was pressed to be formed and heated to be sintered. Since a processed material and a material that does not react with it are used, no reaction (fusing) due to a high temperature occurs. Thus the metal fibers of the web are not fused, i.e., they do not adhere to any surface of the rollers. Thus the current uniformly passes through the entire web.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Powder Metallurgy (AREA)
  • Sliding-Contact Bearings (AREA)
EP96111620A 1995-07-21 1996-07-18 Apparatus and method for continuously producing sintered metal fiber porous body Withdrawn EP0754516A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP7207586A JPH0931504A (ja) 1995-07-21 1995-07-21 金属繊維焼結多孔体の連続製造法およびその設備
JP207586/95 1995-07-21

Publications (2)

Publication Number Publication Date
EP0754516A2 true EP0754516A2 (en) 1997-01-22
EP0754516A3 EP0754516A3 (enrdf_load_stackoverflow) 1997-01-29

Family

ID=16542225

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96111620A Withdrawn EP0754516A2 (en) 1995-07-21 1996-07-18 Apparatus and method for continuously producing sintered metal fiber porous body

Country Status (3)

Country Link
EP (1) EP0754516A2 (enrdf_load_stackoverflow)
JP (1) JPH0931504A (enrdf_load_stackoverflow)
KR (1) KR970005464A (enrdf_load_stackoverflow)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009030208A1 (de) * 2007-09-03 2009-03-12 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Bauteil sowie seine verwendung
CN102211191A (zh) * 2011-05-19 2011-10-12 中国石油化工股份有限公司 一种布气用吹扫器的制备方法
US8828325B2 (en) 2007-08-31 2014-09-09 Caterpillar Inc. Exhaust system having catalytically active particulate filter
CN112157265A (zh) * 2020-09-30 2021-01-01 西部金属材料股份有限公司 一种电阻烧结制备金属纤维多孔材料的方法及设备
CN112157264A (zh) * 2020-09-30 2021-01-01 西部金属材料股份有限公司 一种辊轧式连续电阻烧结制备金属纤维多孔材料的方法及设备

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2210460C1 (ru) * 2001-12-06 2003-08-20 Егоров Сергей Николаевич Способ изготовления изделий из шихты на основе металлического порошка
KR102199185B1 (ko) * 2019-06-24 2021-01-06 한국에너지기술연구원 산 염기 기반 연료전지 시스템
KR102328131B1 (ko) * 2020-04-02 2021-11-18 한국에너지기술연구원 고농도 이온용액을 이용한 수소생산 장치

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2355954A (en) * 1942-03-04 1944-08-15 Hardy Metallurg Company Powder metallurgy
JPS4825849B1 (enrdf_load_stackoverflow) * 1966-02-10 1973-08-01
DE1533024A1 (de) * 1966-11-12 1969-09-11 Rhein Westfael Elect Werk Ag Verfahren und Vorrichtung zur Herstellung von faserporoesen Platten
BE1006452A3 (nl) * 1992-12-18 1994-08-30 Bekaert Sa Nv Poreus gesinterd laminaat omvattende metaalvezels.

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8828325B2 (en) 2007-08-31 2014-09-09 Caterpillar Inc. Exhaust system having catalytically active particulate filter
WO2009030208A1 (de) * 2007-09-03 2009-03-12 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Bauteil sowie seine verwendung
CN102211191A (zh) * 2011-05-19 2011-10-12 中国石油化工股份有限公司 一种布气用吹扫器的制备方法
CN102211191B (zh) * 2011-05-19 2013-02-27 中国石油化工股份有限公司 一种布气用吹扫器的制备方法
CN112157265A (zh) * 2020-09-30 2021-01-01 西部金属材料股份有限公司 一种电阻烧结制备金属纤维多孔材料的方法及设备
CN112157264A (zh) * 2020-09-30 2021-01-01 西部金属材料股份有限公司 一种辊轧式连续电阻烧结制备金属纤维多孔材料的方法及设备

Also Published As

Publication number Publication date
JPH0931504A (ja) 1997-02-04
KR970005464A (ko) 1997-02-19
EP0754516A3 (enrdf_load_stackoverflow) 1997-01-29

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