EP0669860B1 - Moulding of apertured articles - Google Patents
Moulding of apertured articles Download PDFInfo
- 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
Links
Images
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)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
- Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
- Materials For Medical Uses (AREA)
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 (en) | 1995-09-06 |
EP0669860B1 true EP0669860B1 (en) | 1997-07-02 |
Family
ID=26301807
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP93922016A Expired - Lifetime EP0669860B1 (en) | 1992-10-16 | 1993-10-05 | Moulding of apertured articles |
Country Status (11)
Country | Link |
---|---|
EP (1) | EP0669860B1 (sk) |
AT (1) | ATE154904T1 (sk) |
AU (1) | AU5117093A (sk) |
CZ (1) | CZ291187B6 (sk) |
DE (3) | DE9302768U1 (sk) |
ES (1) | ES2062938B1 (sk) |
HU (1) | HU218087B (sk) |
IT (1) | IT1260870B (sk) |
NL (1) | NL9300942A (sk) |
SK (1) | SK283087B6 (sk) |
WO (1) | WO1994008743A1 (sk) |
Cited By (1)
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)
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 (en) * | 2013-12-20 | 2016-03-16 | Seco Tools Ab | Cutting inserts with cross-holes and green bodies and methods for making such cutting inserts and green bodies |
Family Cites Families (6)
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 |
-
1993
- 1993-01-29 IT ITTO930050A patent/IT1260870B/it active IP Right Grant
- 1993-02-05 DE DE9302768U patent/DE9302768U1/de not_active Expired - Lifetime
- 1993-02-05 DE DE4303396A patent/DE4303396A1/de not_active Withdrawn
- 1993-02-12 ES ES09300277A patent/ES2062938B1/es not_active Expired - Fee Related
- 1993-06-01 NL NL9300942A patent/NL9300942A/nl not_active Application Discontinuation
- 1993-10-05 SK SK498-95A patent/SK283087B6/sk not_active IP Right Cessation
- 1993-10-05 AT AT93922016T patent/ATE154904T1/de not_active IP Right Cessation
- 1993-10-05 DE DE69311909T patent/DE69311909T2/de not_active Expired - Fee Related
- 1993-10-05 AU AU51170/93A patent/AU5117093A/en not_active Abandoned
- 1993-10-05 EP EP93922016A patent/EP0669860B1/en not_active Expired - Lifetime
- 1993-10-05 CZ CZ1995951A patent/CZ291187B6/cs not_active IP Right Cessation
- 1993-10-05 WO PCT/GB1993/002069 patent/WO1994008743A1/en active IP Right Grant
- 1993-10-05 HU HU9501090A patent/HU218087B/hu not_active IP Right Cessation
Cited By (2)
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 |
---|---|
ES2062938B1 (es) | 1998-07-01 |
ES2062938R (sk) | 1998-02-01 |
DE9302768U1 (sk) | 1993-05-19 |
EP0669860A1 (en) | 1995-09-06 |
IT1260870B (it) | 1996-04-29 |
ES2062938A2 (es) | 1994-12-16 |
AU5117093A (en) | 1994-05-09 |
CZ291187B6 (cs) | 2003-01-15 |
ITTO930050A0 (it) | 1993-01-29 |
HU9501090D0 (en) | 1995-06-28 |
DE69311909T2 (de) | 1998-02-12 |
ITTO930050A1 (it) | 1993-04-30 |
NL9300942A (nl) | 1994-05-16 |
HUT70867A (en) | 1995-11-28 |
DE4303396A1 (de) | 1994-04-21 |
ATE154904T1 (de) | 1997-07-15 |
DE69311909D1 (de) | 1997-08-07 |
SK283087B6 (sk) | 2003-02-04 |
SK49895A3 (en) | 1996-03-06 |
CZ95195A3 (en) | 1995-10-18 |
HU218087B (hu) | 2000-05-28 |
WO1994008743A1 (en) | 1994-04-28 |
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