EP0669860B1 - Das formen von gelöcherten gegenständen - Google Patents

Das formen von gelöcherten gegenständen Download PDF

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Publication number
EP0669860B1
EP0669860B1 EP93922016A EP93922016A EP0669860B1 EP 0669860 B1 EP0669860 B1 EP 0669860B1 EP 93922016 A EP93922016 A EP 93922016A EP 93922016 A EP93922016 A EP 93922016A EP 0669860 B1 EP0669860 B1 EP 0669860B1
Authority
EP
European Patent Office
Prior art keywords
article
hole
cavity
passageway
core rod
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
EP93922016A
Other languages
English (en)
French (fr)
Other versions
EP0669860A1 (de
Inventor
Terence Corcoran
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.)
GTB Components Ltd
Original Assignee
GTB Components 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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=26301807&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0669860(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Priority claimed from GB9221750A external-priority patent/GB9221750D0/en
Application filed by GTB Components Ltd filed Critical GTB Components Ltd
Publication of EP0669860A1 publication Critical patent/EP0669860A1/de
Application granted granted Critical
Publication of EP0669860B1 publication Critical patent/EP0669860B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
    • B22F5/10—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of articles with cavities or holes, not otherwise provided for in the preceding subgroups
    • B22F5/106—Tube or ring forms
    • 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
    • B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
    • B22F5/10—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of articles with cavities or holes, not otherwise provided for in the preceding subgroups
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B11/00—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses
    • B30B11/02—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses using a ram exerting pressure on the material in a moulding space
    • B30B11/04—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses using a ram exerting pressure on the material in a moulding space co-operating with a fixed mould
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/02—Dies; Inserts therefor; Mounting thereof; Moulds
    • B30B15/022—Moulds for compacting material in powder, granular of pasta form
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/26—Arrangements for connecting different sections of heat-exchange elements, e.g. of radiators
    • F28F9/262—Arrangements for connecting different sections of heat-exchange elements, e.g. of radiators for radiators
    • 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
    • B22F3/02—Compacting only
    • B22F3/03—Press-moulding apparatus therefor
    • B22F2003/033—Press-moulding apparatus therefor with multiple punches working in the same direction
    • 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
    • B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
    • B22F5/10—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of articles with cavities or holes, not otherwise provided for in the preceding subgroups
    • B22F2005/103—Cavity made by removal of insert
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2240/00—Spacing means

Definitions

  • the invention relates to the moulding of apertured articles.
  • the invention relates to the manufacture of an article by pressing or compacting particulate material in a mould shaped to provide the article with a hole extending at right angles to the direction of pressing.
  • the method includes the step of placing an inner core rod in the mould parts so that the rod extends in the direction of pressure applied to the mould parts thereby to form a passageway in the article, the hole being formed by the side core rod extending from the side wall of the article towards the passageway.
  • the side core rod is dimensioned so that the hole communicates with the passageway.
  • the method includes placing at least two hole forming core rods at diametrically opposite sides of the mould part.
  • loose particulate material e.g. metal powder
  • the punch is then moved in a rectilinear direction to compress the particulate material by a factor of about 2:1 to a predetermined density, typically about 6.5g/cm 3 .
  • a side core rod is present in the mould, the compression ratio is higher, especially in the regions of the core rod, so that the density in those regions can be as high as about 7.4g/cm 3 .
  • the extent to which the density may be adjusted in the region of the formed hole will depend on a number of factors, e.g. the cross-sectional dimensions and shape of the side core rod.
  • One example is a spacer for a central heating hot water radiator or other heat exchanger which is subjected to a bursting force when connected, e.g. riveted, to one or more panels.
  • the radiator may be of any known construction.
  • the method of the invention may be applied to the manufacture of any article by pressing where a hole is to be formed in the side wall.
  • the particulate material may be any suitable material, typically metal powder or a sintered metal powder or the like.
  • the formed article may be subjected to a further treatment, e.g. a heat treatment.
  • a further treatment e.g. a heat treatment.
  • the invention provides a die for use in making a tubular article of compacted particulate material, the article having a passageway and a side hole; the die comprising a female rigid mould part defining a die cavity, a first punch at one end of the cavity, an inner core rod extending into the cavity from the first punch; at least one retractable side core rod extending into the cavity at right angles to the inner core rod, and a second punch at the other end of the cavity, whereby in use, after the first punch has been advanced to cause the inner core rod to extend in the cavity and the side core has been moved to extend towards the inner core rod, loose particulate material is introduced into the cavity anti the punches are moved towards each other to compact the particulate material in the cavity to form the article.
  • the invention extends to a moulded article comprising particulate material which has been compacted in a single pressing, the article having an axial passageway characterised in that the article additionally has a hole which extends across the article and through the passageway, the compacted material in the region of the hole on opposite sides of the axial passageway being denser than the regions remote from the hole.
  • the invention offers an economical method for the production of articles, eliminating the need for drilling of side holes after compaction; reduces the amount of raw material required; and offers a control of the density of the article to give higher strength in the areas of most stress in use relative to lower strength areas which suffer less stress in use.
  • DE-A-2145006 discloses a technique of isostatic pressing using a flexible female mould part and a side core. That technique is not relevant to the present invention because the pressing is in a transverse direction, not longitudinal, and the rods are floating.
  • a preform is subjected to a press step in a mould including side rods but the rods are located in preformed holes.
  • DE-A-2 852 429 discloses a method of moulding an article of particulate metallic material wherein the die cavity is filled with powder and then a part of the powder is displaced from the cavity by insertion of a transverse rod.
  • the die comprises a metal plate 1 having a vertical cavity 2.
  • An inner core rod 3 is present in the cavity surrounded at its lower end by a bottom punch 4. When the cavity is empty the inner core rod 3 is level with the top face of the die.
  • Passageways 5 are present in the sides of the plate 1 and open at the sides of the cavity 2; the passageways are in horizontal axial alignment.
  • the passageways contain side core rods 6 which can be advanced by power means, not shown, to contact the inner core rod 3. Four such rods 6 are present.
  • a top punch 7 is present above the cavity 2.
  • the cavity 2 is filled with a loose compactable material such as iron powder optionally with suitable additives.
  • a loose compactable material such as iron powder optionally with suitable additives.
  • the top of the inner core rod 3 is level with the top face of the plate 1.
  • the side rods 6 are preferably already in contact with the inner side rod 3.
  • the top punch 7 is lowered and the bottom punch 4 raised relative to the top punch to compact the material to form the spacer.
  • the pressing is thus in the axis of the vertical cavity 2.
  • the compression ratio is about 2:1.
  • the spacer 10 formed (shown in Figures 3 and 4) is removed and the cycle is repeated.
  • the spacer 10 consists of a ring of compacted iron powder having a central passageway 12 and two pairs of diametrically opposed holes 11.
  • the passageway 12 has been formed by the inner core rod 3 and the side holes 11 by the side core rods 6. Examination of the walls of the holes 11 showed that they are of increased material density and hardness above and below the holes and that the wall of the holes is less sharp than one would expect to see if the hole were drilled.
  • the formed spacer may be treated further, e.g. subjected to a heat treatment.
  • the particulate material Because of the way in which the compaction takes place it is possible to compact the particulate material so that the article formed has areas or zones of different density.
  • the material is of increased density about the hole formed by the side rods. This means that the spacer is stronger in what would otherwise be a region of weakness and substantially cheaper to manufacture because the article is moulded in a single operation.
  • radiators of pressed steel construction have the inlet and outlet connectors going into the rear panel at the comers. Some just have bottom connectors, some have both top and bottom, i.e. at each corner on the rear panel. Most manufacturers projection weld the connectors onto the rear panel. Since the radiator is hollow at this point, a spacer is placed between the front and the rear panels to support the rear panel during the welding operation.
  • the spacers are generally in the shape of a ring, so that in use water can pass through the connection into the centre of the ring, and out through holes or slots provided in the spacer. During production the spacer has to be fed and accurately located either over a hole already pierced in the back panel or to a definite location under a diamond shaped punch.
  • the spacer is then secured to the panel by a punch which plunges material into the spacer centre hole, or by the diamond shaped punch piercing and plunging to hold the spacer in position. It is also known to pierce a hole in the panel into which is fitted a spacer with a collar, which is then lightly peened to hold. Because a spacer of this invention has increased strength about the hole, it is better able to resist forces undergone by the spacer when it is fixed to the panels which may form a part of a radiator which may be a single, double or triple panel structure.
  • additives may be added to the powder to be compacted, e.g. those known to improve the flow of loose particulate material.
  • the number and disposition of the side core rods may be varied. Steps may be taken to prevent damage to the side core rods, during compaction, e.g. to equalise pressure above and below by allowing the die to float downwards during the compaction.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Powder Metallurgy (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Magnetic Heads (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Materials For Medical Uses (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)

Claims (5)

  1. Verfahren zum Formen eines Artikels (10) aus Partikelmaterial in einem einzigen Preßvorgang, wobei der Artikel wenigstens ein seitliches Loch (11) in einer Seitenwand aufweist, wobei das seitliche Loch (11) mit einem in Preßrichtung verlaufenden Kanal (12) in Verbindung steht, wobei das Verfahren folgendes umfaßt:
    - Plazieren eines Seiterkernstabes (6) zur Bildung des seitlichen Loches (11) in einem starren Formteil (2), so daß er von einer Seite des Formteils zur anderen verläuft,
    - Eingeben von losem Partikelmaterial in den einen Formteil (2),
    - Kontaktieren des ersten Formteils (2) mit einem zweiten Formteil (4,1,7) und Zusammendrücken des Materials durch Aufbringen von Druck entlang einer Achse, die im Wesentlichen im rechten Winkel zur Achse des Kernstabes (6) liegt, um auf diese Weise den Artikel (10) mit dem seitlichen Loch (11) zu formen, Zurückziehen des Seitenkerns (6) und
    - Entfernen des geformten Artikels (10) mit einem Kanal (12) und einem seitlichen Loch (11) aus der Form (1).
  2. Verfahren nach Anspruch 1, umfassend das Plazieren von wenigstens zwei Lochform-Kernstäben (6) auf diametrisch gegenüberliegenden Seiten des starren Formteils (2).
  3. Verfahren nach Anspruch 1 und 2, wobei der geformte Artikel ein Abstandshalter für einen Heizkörper einer Heißwasserzentralheizung, einen Wärmetauscher oder dergleichen ist.
  4. Matrize zur Verwendung bei der Herstellung eines röhrenförmigen Artikels (10) aus zusammengedrücktem Partikelmaterial, wobei der Artikel (10) einen Kanal (12) und ein seitliches Loch (11) aufweist, wobei die Matrize ein starres Formunterwerkzeug (1) zur Definierung eines Matrizenhohlraums (2), ein erstes Obenwerkzeug (4) an einem Ende des Hohlraums, einen von dem ersten Obenwerkzeug (4) in den Hohlraum verlaufenden inneren Kernstab (3), wenigstens einen im rechten Winkel zu dem inneren Kernstab (3) in den Hohlraum verlaufenden zurückziehbaren Seitenkernstab (6) und ein zweites Oberwerkzeug (7) am anderen Ende des Hohlraums umfaßt.
  5. Formartikel (10), umfassend Partikelmaterial, das in einem einzigen Preßvorgang zusammengedrückt wurde, wobei der Artikel (10) einen axialen Kanal (12) aufweist, dadurch gekennzeichnet daß der Artikel (10) zusätzlich ein Loch (11) aufweist, das quer zu dem Artikel und durch den Kanal (12) verläuft, wobei das zusammengedrückte Material im Bereich des Loches (11) auf gegenüberliegenden Seiten des axialen Kanals (12) dichter ist als die von dem Loch (11) entfernten Bereiche.
EP93922016A 1992-10-16 1993-10-05 Das formen von gelöcherten gegenständen Expired - Lifetime EP0669860B1 (de)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
GB9221750A GB9221750D0 (en) 1992-10-16 1992-10-16 Central heating radiator spacers
GB9221750 1992-10-16
GB9300812A GB2271526B (en) 1992-10-16 1993-01-15 Moulding of apertured articles
GB9300812 1993-01-15
PCT/GB1993/002069 WO1994008743A1 (en) 1992-10-16 1993-10-05 Moulding of apertured articles

Publications (2)

Publication Number Publication Date
EP0669860A1 EP0669860A1 (de) 1995-09-06
EP0669860B1 true EP0669860B1 (de) 1997-07-02

Family

ID=26301807

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93922016A Expired - Lifetime EP0669860B1 (de) 1992-10-16 1993-10-05 Das formen von gelöcherten gegenständen

Country Status (11)

Country Link
EP (1) EP0669860B1 (de)
AT (1) ATE154904T1 (de)
AU (1) AU5117093A (de)
CZ (1) CZ291187B6 (de)
DE (3) DE4303396A1 (de)
ES (1) ES2062938B1 (de)
HU (1) HU218087B (de)
IT (1) IT1260870B (de)
NL (1) NL9300942A (de)
SK (1) SK283087B6 (de)
WO (1) WO1994008743A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109475935A (zh) * 2016-06-30 2019-03-15 山高刀具公司 压制工具

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19508952C2 (de) * 1995-03-13 1998-04-16 Schwaebische Huettenwerke Gmbh Preßvorrichtung zur Erzeugung eines Formteils und entsprechendes Formteil
IL166530A (en) * 2005-01-27 2009-06-15 Iscar Ltd Method for manufacturing cutting dies
GB2426735A (en) * 2005-10-19 2006-12-06 Gtb Components Ltd Forming of apertured articles
US8062014B2 (en) 2007-11-27 2011-11-22 Kennametal Inc. Method and apparatus using a split case die to press a part and the part produced therefrom
EP2886232B1 (de) * 2013-12-20 2016-03-16 Seco Tools Ab Schneideinsätze mit Querbohrungen und Grünkörper sowie Verfahren zur Herstellung solcher Schneideinsätze und Grünkörper

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB994323A (en) * 1962-06-12 1965-06-02 Geometra Mario Gritti An improved method and machine for moulding
GB1097355A (en) * 1966-07-14 1968-01-03 Federal Mogul Corp Method of producing sintered articles of complicated shape
DE2145006C3 (de) * 1971-09-09 1974-01-31 Sintermetallwerk Krebsoege Gmbh, 5608 Krebsoege Verfahren und Vorrichtung zum Herstellen von Formkörpern mit Wandöffnungen oder -schlitzen durch isostatisches Pressen von Pulvern
DK546377A (da) * 1977-12-08 1979-06-09 O P Olling Fremgangsmaade ved fremstilling af pulverpressede emner og vaerktoej til udfoerelse af fremgangsmaaden
JPS60108199A (ja) * 1983-11-16 1985-06-13 Toyota Motor Corp 粉末成形における横パンチガイド部の粉末除去方法
FR2607740B1 (fr) * 1986-12-08 1989-12-08 Peugeot Procede de fabrication de pieces frittees

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109475935A (zh) * 2016-06-30 2019-03-15 山高刀具公司 压制工具
CN109475935B (zh) * 2016-06-30 2021-06-29 山高刀具公司 压制工具

Also Published As

Publication number Publication date
DE9302768U1 (de) 1993-05-19
ES2062938B1 (es) 1998-07-01
SK283087B6 (sk) 2003-02-04
DE4303396A1 (de) 1994-04-21
IT1260870B (it) 1996-04-29
ITTO930050A0 (it) 1993-01-29
HU9501090D0 (en) 1995-06-28
CZ95195A3 (en) 1995-10-18
CZ291187B6 (cs) 2003-01-15
ATE154904T1 (de) 1997-07-15
NL9300942A (nl) 1994-05-16
ES2062938R (de) 1998-02-01
DE69311909T2 (de) 1998-02-12
HUT70867A (en) 1995-11-28
EP0669860A1 (de) 1995-09-06
ITTO930050A1 (it) 1993-04-30
AU5117093A (en) 1994-05-09
HU218087B (hu) 2000-05-28
WO1994008743A1 (en) 1994-04-28
DE69311909D1 (de) 1997-08-07
SK49895A3 (en) 1996-03-06
ES2062938A2 (es) 1994-12-16

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