EP0257425A2 - Pièce de coulée - Google Patents

Pièce de coulée Download PDF

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Publication number
EP0257425A2
EP0257425A2 EP87111549A EP87111549A EP0257425A2 EP 0257425 A2 EP0257425 A2 EP 0257425A2 EP 87111549 A EP87111549 A EP 87111549A EP 87111549 A EP87111549 A EP 87111549A EP 0257425 A2 EP0257425 A2 EP 0257425A2
Authority
EP
European Patent Office
Prior art keywords
core
casting
die
cavity
metal
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Withdrawn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
EP87111549A
Other languages
German (de)
English (en)
Other versions
EP0257425A3 (fr
Inventor
Norman Brown
David Rastall
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.)
Metal Castings (Worcester) Ltd
Original Assignee
Metal Castings (Worcester) 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 Metal Castings (Worcester) Ltd filed Critical Metal Castings (Worcester) Ltd
Publication of EP0257425A2 publication Critical patent/EP0257425A2/fr
Publication of EP0257425A3 publication Critical patent/EP0257425A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/10—Cores; Manufacture or installation of cores
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/10—Cores; Manufacture or installation of cores
    • B22C9/103—Multipart cores
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • B22D17/20—Accessories: Details
    • B22D17/22—Dies; Die plates; Die supports; Cooling equipment for dies; Accessories for loosening and ejecting castings from dies
    • B22D17/24—Accessories for locating and holding cores or inserts

Definitions

  • the present invention concerns casting of bodies having shapes which are not simple shapes, cores being used to achieve undercut formations in the castings.
  • a core we mean an element or assembly of elements which is disposed in the cavity in which the casting is to be formed, the core being formed separately from the body which defines that cavity and the core defining a part of the surface of the casting but being separated from the casting after the latter has solidified, for example, after the casting has been removed from the cavity which is formed.
  • a method of casting wherein there is provided a body defining a cavity, a metal core is placed in the cavity, the cavity is charged with molten metal, the molten metal cools to form a casting containing the core, the casting is separated from the body and the core is removed from the casting and wherein the core is formed at least partly of a metal having a composition substantially the same as that of the casting.
  • the metal of which the core is formed having a composition which is substantially the same as the composition of the casting
  • the composition of the core is either identical with that of the casting or is sufficiently similar for the core and the casting to be remelted together in a bulk supply of metal for making further castings. It is common for a number of imperfect castings to be produced during the production of a large number of castings which are intended to be identical one with another. Imperfect castings may be produced at the beginning of a run, when a die in which in all of the castings are to be produced and associated ducts through which the molten metal is supplied are below the normal working temperature.
  • the core may be an assembly comprising a plurality of components.
  • the core or each component thereof is formed by diecasting. Even in a case where the core is removed from an acceptable casting, the core may be re-melted after a single use. When all of the cores are re- melted after use, it is unnecessary to carry out any maintenance of the cores and no disadvantage arises from any damage caused to the cores, during removal from the castings.
  • the shape of the core may be changed during removal of the core from the casting.
  • the shape of the core may be changed by removal of material and/or deforming the material of the core.
  • the core preferably has a wall thickness over at least a majority of the area of the wall which is not substantially less than, and is more preferably substantially greater than, the wall thickness of a part of the casting which engages the core. This ensures that the core does not receive from the molten metal sufficient heat to melt the core. It will be understood that a core of particularly low mass may become fused to the casting, unless arrangements are made to extract heat from the core whilst it is contact with the molten metal introduced into the cavity.
  • the method of the invention has been devised for use in the diecasting of light metals and alloys thereof. These metals include aluminium, magnesium and zinc.
  • a method of diecasting wherein a light metal core is mounted on or in an open die, the die is closed with the core inside, liquid metal, preferably having a composition which is substantially the same as that of the metal of which the core is formed, is admitted to the die cavity, the die is opened after the liquid metal has solidified to form a casting, the casting is removed from the die and the core is removed from the casting.
  • the method is useful in pressure diecasting, when the molten metal in the die is subjected to a pressure in excess of 10,000 psi (690 bar), although can be applied where the die is subjected to less than 10,000 psi(690 bar), for example dwon to 8000 psi (552 bar) or even less.
  • the die illustrated in the drawing comprises first and second parts 10 and I I respectively which collectively define a die-cavity.
  • the die parts are mounted in a die casting machine which may be of known construction and the die part I is provided with a gated runner system 12 through which molten metal can be driven by means not shown from a bulk supply into the die-cavity, when the die is closed.
  • the means for melting and storing the bulk supply of molten metal and for driving portions of metal from that bulk supply into the die cavity form no part of the present invention and are therefore not described herein or shown in the drawings.
  • the die part 10 is generally of hollow, and in the example described generally cylindrical form and is open at one end only.
  • the die part I I carries a core 13 which may be permanently fixed in the part I or removably mounted therein. When the die is closed, the core 13 extends along the interior of the die part 10 to the closed end thereof.
  • an annular core 14 is mounted on the core 13 to lie within the die cavity, when the die is closed.
  • the core 14 is so positioned on the core 13 that the core 14 is spaced from the closed end of the die part 10 and is also spaced from the die part II, when the die is closed.
  • molten metal is injected into the die cavity, it flows around the core 14 and this core therefore establishes an undercut formation in the casting.
  • the die is opened and the casting is then ejected from the die part 10. After the casting has been ejected, the core 14 is removed from the casting.
  • the core 13 is withdrawn from the core 14 when the die is opened or when the casting is ejected.
  • the core 13 may remain in the core 14, when the die is opened.
  • the die part 13 may be withdrawn from the core 14 after the casting has been ejected from the die part 10 but in preparation for removal of the core 14 from the casting .
  • the core 14 is of generally annular shape and preferably comprises at least four arcuate components which are assembled together prior to being mounted on the core 13. These components may have integral formations which are in mutual engagement to maintain the assembled relation of the core parts until the core is to be removed from the casting. In this case, these formations may be deformed or removed, prior to removal of the core from the casting. Alternately, one or more additional elements may be used to maintain the core parts in assembled relation with one another. For example, there may be provided a circumferential band 15. The parts of the core 14 may be assembled with one another on the core 13 or prior to mounting of the core 14 on the core 13. The core 14 may be assembled on the core 13 prior to mounting of the core 13 in the die part II.
  • the casting 16 is formed of an aluminium alloy.
  • the components of the core 13 are formed of the same alloy. These components may be formed by diecasting, by extrusion or by machining from suitable stock.
  • the core 14 may be non-circular and can be asymmetrical, without inconvenience.
  • the die parts 10 and I and the core 13 are formed of steel. Each of these is used repeatedly in the making of further castings.
  • core 13 could be made of aluminium alloy or any other suitable material, and where this is not fixed with respect to die part I l, may, like core 13, be disposable after a single casting.
  • the arrangement of the core 14 may be such that one component thereof is readily moved relative to the other components in a radially inwards direction, once the core 13 had been removed from the core 14.
  • the core 14 may be removed from the casting without substantial damage to the components of the core 14.
  • the shape of one or more components of the core 14 may be modified during the removal procedure, by example by machining some material away from the core 14 or by deforming that core.
  • the components of the core 14 are preferably re- melted, after a single use, so that new core components are used for each casting.
  • the core 14 may be easily extracted from the casting, thereby enabling some re-use of the core 14, or at least some portions of the core 14, to give economic advantage.
  • the core 14 does not contribute greatly to the combined weight of the casting and core and therefor does not increase the difficulty of handling the casting.
  • the core 14 and the casting have substantially the same co-efficient of thermal expansion and so shrinkage of the casting onto the core during cooling, is at least reduced.
  • the temperature difference between the core 14 and the cast metal helps prevent fusion of the core to the casting.
  • the molten metal is preferably subjected to pressure whilst in the die cavity.
  • a pressure in excess of 50 psi (3.45 bar) is used preferably about 8000 psi (552 bar) or above. More preferably, a pressure in excess of 10,000 psi (690 bar) is attained.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
EP87111549A 1986-08-19 1987-08-10 Pièce de coulée Withdrawn EP0257425A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8620153 1986-08-19
GB8620153A GB2193914B (en) 1986-08-19 1986-08-19 Casting

Publications (2)

Publication Number Publication Date
EP0257425A2 true EP0257425A2 (fr) 1988-03-02
EP0257425A3 EP0257425A3 (fr) 1988-06-01

Family

ID=10602907

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87111549A Withdrawn EP0257425A3 (fr) 1986-08-19 1987-08-10 Pièce de coulée

Country Status (2)

Country Link
EP (1) EP0257425A3 (fr)
GB (1) GB2193914B (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5725044A (en) * 1994-08-30 1998-03-10 Hirokawa; Koji Casting method using a forming die
CN107150107A (zh) * 2017-06-30 2017-09-12 大连金河铸造有限公司 一种床身类铸件铸造工艺及其型芯结构

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0760399A (ja) * 1993-08-27 1995-03-07 Toyota Motor Corp 鋳造用金型構造
CN103736933B (zh) * 2013-12-24 2016-11-23 杜占军 一种铸钢用可熔性金属芯及其制备和使用方法
CN103736909B (zh) * 2013-12-24 2016-01-27 北京时代锐智科技有限公司 一种铸铁用可熔性金属芯及其制备和使用方法

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB408798A (en) * 1933-03-24 1934-04-19 Arthur William Brearley Improvements in or relating to cores and moulds for ingots and other heavy castings
GB558627A (en) * 1942-07-07 1944-01-13 Birmingham Aluminium Casting Metal cores for casting hollow metal articles
GB879354A (en) * 1959-03-10 1961-10-11 Lars Herman Viktor Villner Improvements in cores and moulds for casting metals
US3186045A (en) * 1959-12-03 1965-06-01 Lagostina Adriano Method of casting composite cooking vessel
GB966460A (en) * 1962-06-16 1964-08-12 Solo Kleinmotoren G M B H Improvements in the manufacture of cylinders for reciprocating piston machines
GB1191202A (en) * 1967-04-01 1970-05-13 Nippon Piston Ring Co Ltd Method of Producing Cam Shafts and Cam Shafts Produced by Such Method
US3570581A (en) * 1968-04-19 1971-03-16 North American Rockwell Apparatus for casting rings
JPS5429108U (fr) * 1977-07-30 1979-02-26
US4278124A (en) * 1978-04-11 1981-07-14 Kawasaki Steel Corporation Method of producing hollow steel ingot and apparatus therefor
DE3135258A1 (de) * 1981-09-05 1982-10-21 Daimler-Benz Ag, 7000 Stuttgart "verfahren zum herstellen von guss- oder fliesspressteilen mit durchbruechen"
ES8402188A1 (es) * 1982-04-15 1984-01-16 Creusot Loire Procedimiento de fabricacion de un lingote hueco de acero.
JPS58196156A (ja) * 1982-05-10 1983-11-15 Tokai Rika Co Ltd 全自動ダイカスト鋳造装置

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5725044A (en) * 1994-08-30 1998-03-10 Hirokawa; Koji Casting method using a forming die
CN107150107A (zh) * 2017-06-30 2017-09-12 大连金河铸造有限公司 一种床身类铸件铸造工艺及其型芯结构
CN107150107B (zh) * 2017-06-30 2024-01-05 大连金河铸造有限公司 一种床身类铸件铸造工艺及其型芯结构

Also Published As

Publication number Publication date
EP0257425A3 (fr) 1988-06-01
GB2193914A (en) 1988-02-24
GB8620153D0 (en) 1986-10-01
GB2193914B (en) 1990-08-15

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Inventor name: RASTALL, DAVID

Inventor name: BROWN, NORMAN