EP0979697A1 - Verfahren und System zur Herstellung eines Gussteils, versehen mit einem Insert - Google Patents

Verfahren und System zur Herstellung eines Gussteils, versehen mit einem Insert Download PDF

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Publication number
EP0979697A1
EP0979697A1 EP98830495A EP98830495A EP0979697A1 EP 0979697 A1 EP0979697 A1 EP 0979697A1 EP 98830495 A EP98830495 A EP 98830495A EP 98830495 A EP98830495 A EP 98830495A EP 0979697 A1 EP0979697 A1 EP 0979697A1
Authority
EP
European Patent Office
Prior art keywords
casting
cavity
insert
heating means
heating
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Withdrawn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
EP98830495A
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English (en)
French (fr)
Inventor
Attilio Laurino
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.)
Fata Group SpA
Original Assignee
Fata Group SpA
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 Fata Group SpA filed Critical Fata Group SpA
Priority to EP98830495A priority Critical patent/EP0979697A1/de
Priority to MX9907388A priority patent/MXPA99007388A/es
Publication of EP0979697A1 publication Critical patent/EP0979697A1/de
Withdrawn legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D19/00Casting in, on, or around objects which form part of the product
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D47/00Casting plants

Definitions

  • the present invention addresses in general the problem of the manufacture of castings with inserts.
  • a classic example of application of this technique is the manufacture of mechanical components such as internal-combustion-engine blocks and heads.
  • the part as a whole that is, the block or the head
  • the elements which are subjected to greater stress are made of a different material (cast iron, steel, ceramic materials, etc.).
  • a known solution provides for fine machining of the block so as to transform the cavities of the cylinders formed by casting into seats in which the cylinder liners can be fitted only after cooling to extremely low temperature (achieved by immersion in liquid nitrogen) with consequent contraction of the liners in a diametral direction.
  • the subsequent return of the block/liner assembly to ambient temperature and, in particular, to working temperatures causes the liners to expand again so as to achieve a condition of firm restraint inside the block.
  • This method is quite complex to implement, particularly with regard to the criticality of the respective parameters.
  • the object of the present invention is to provide a solution which can combine the required excellent final result with an ability to implement a quick and efficient industrial process.
  • the system 1 may be used, for example, for the manufacture of internal-combustion-engine blocks made of light alloy in which the inserts are constituted by the cylinder liners which are made of a metallic material, for example, cast iron, having greater resistance to mechanical and thermal stress.
  • the embodiment illustrated relates to the production of internal-combustion-engine blocks comprising six cylinders in a V-arrangement.
  • the heart of the system 1 is constituted by a casting station 2 towards which a line for the loading and advance of the casting cores converges from one side and a casting robot 4 converges from the other side, the casting robot 4 taking the hot casting material (for example fused light alloy) from a furnace 5 and then advances towards the casting station 2 where the material is poured into the casting dies (moulds).
  • a casting station 2 towards which a line for the loading and advance of the casting cores converges from one side and a casting robot 4 converges from the other side
  • the casting robot 4 taking the hot casting material (for example fused light alloy) from a furnace 5 and then advances towards the casting station 2 where the material is poured into the casting dies (moulds).
  • the hot casting material for example fused light alloy
  • a robot, generally indicated 8 usually has a flag-like or lantern-like structure (in this connection, see in particular the view of Figure 2) and acts as an output robot.
  • the gripping structure 9 of the robot 8 can be brought (see in particular Figure 2) to the vicinity of the casting station 2 in order to pick up the castings formed therein, to lift them, and to transfer them, by rotating about its own principal vertical axis X8, to an output station 9a.
  • the solution according to the invention provides for the presence of a further robot 10 in a position approximately symmetrical to that of the robot 8 with respect to the axis defined by the core loading axis and by the axis of the station 2 (the so-called bench-mould axis).
  • the robot 10 has a structure substantially similar to that of the robot 8 described above.
  • This robot thus also has a generally flag-like or lantern-like structure with a vertical pillar which can rotate about a respective vertical axis X10 and an arm carrying at its end a structure 11 which can pick up the inserts, that is, in the specific case, the liners, in order then to position them inside the casting moulds.
  • the lifting structure 11 is intended to pick up the liners from a pre-heating unit 12, the characteristics of which can be seen in greater detail in the view of Figure 2.
  • the elements which provide for the pre-heating and for the handling of the liners therefore have a corresponding inclination.
  • this inclination of the pre- heating and lifting elements would in fact be unnecessary.
  • these elements may have any orientations and relative positions, in dependence on specific production requirements.
  • the gripping structure 11 comprises a number of gripping units 13 equal to the number of liners to be positioned inside each casting (six in the embodiment shown).
  • Each gripping unit 13 is constituted in general by an element movable on an inclined guide 14 fixed to a framework 15 carried by the arm of the robot 10.
  • each gripping element 13 has, at its lower end, a head 16 which can enter a liner to be picked up in order to perform therein, for example, a radial expansion or opening-out movement brought about by drive means of known type not specifically shown in the drawings and possibly subservient to the general movement of the unit 13 on the guide 14.
  • Each unit 13 can thus exert a gripping action on a liner and, by returning upwards along the respective guide 14, can support the liner on the gripping structure 11 of the robot 10.
  • the pre-heating unit 12 has a configuration generally complementary to that of the gripping structure 11.
  • the unit 12 is usually constituted by a block 17 of thermally conductive material such as metal disposed on a solid bench 18 and having corresponding cavities 19 forming seats in which the liners C to be (pre)-heated are disposed.
  • the insertion of the liners C in the unit 12 may be performed manually by a person employed for this purpose.
  • an automatic loading operation may also be performed, for example, by a unit similar to the gripping unit 11.
  • the cavities 19 usually have a generally cylindrical shape which enables heating elements (typically electrical resistors) to be placed both outside and inside each cavity 19.
  • heating elements typically electrical resistors
  • the reference numerals 20 indicate resistors - of known type - disposed in the block 17 of the unit 12 so as to extend in the vicinity of the outer surface of each cavity 19, and hence in the vicinity of the wall of the liner C inserted in the cavity.
  • the reference numeral 21 indicates further heating elements, usually also constituted by electrical resistors, which extend inside the cavity 19 so that they can be disposed inside the cavities of the liners C subjected to pre-heating.
  • the operating sequence of the system shown in Figure 1 corresponds substantially to the normal operating sequence provided for in a plant of this type, with the difference that the robot 10 inserts the liners C in the die or mould provided for the casting after picking them up from the pre-heating unit 12. This is done in a manner such that, when the casting robot 4 pours casting material into the mould, the liners C are at a high temperature, considerably higher than ambient temperature.
  • the solution according to the invention enables the temperature of the inserts to be regulated particularly precisely on account of the fact that a limited reduction in the temperature of the inserts is generally observed from the moment at which they are extracted from the pre-heating unit 12 to the moment at which the casting is performed, after they have been positioned in the mould.
  • the pre-heating unit 12 usually has a geometry correlated with the geometry of the gripping structure 11 which in turn is linked with the geometry of the arrangement of the liners in the casting mould.
  • the gripping unit 11 has a generally V-shaped configuration with two rows of three gripping elements 13 defining an imaginary dihedron - with a given dihedral angle and a downwardly-facing edge - precisely reproducing the aforementioned V-shaped configuration.
  • the pre-heating unit 12 has a complementary shape since the cavities 19, of which there are also six, are arranged in two rows also defining an imaginary dihedron oriented in an inverted position relative to the structure 11 (that is, with the same dihedral angle but with the edge facing upwards).
  • the robot 10 brings the gripping structure 11 to the vicinity of the pre-heating unit 12.
  • the elements 13 of one of the two rows are then moved downwards along the respective guides 14 into one of the rows of cavities 19 (for example, the gripping elements 13 situated on the left in Figure 2 move down into the cavities 19 situated on the right in the same drawing), so as to extract from the unit 12 three liners C which are picked up by the structure 11.
  • the same operation is repeated with the other row of gripping elements 13 (for example, those on the right) which move down into a corresponding row of cavities 19 (the left-hand row of Figure 2) in order to pick up the other three liners housed in these cavities and return them upwards on the structure 11.
  • the robot 10 rotates about its vertical axis X10 so as to bring the structure 11 above the casting station 2 where the two rows of liners are placed inside the casting mould by an operation substantially complementary to that described above.
  • cores and/or complementary elements are provided in the mould for receiving the liners C, keeping them positioned precisely in the desired final positions of incorporation in the casting (in this case, the block).
  • the period of time which elapses between the picking-up of the liners C from the unit 12 and the moment of casting is typically of the order of about 25 seconds.
  • the corresponding reduction in the temperature of the liners C is typically of the order of about 50°; in this connection, it may be noted that the foundry environment is itself a fairly hot environment so that, particularly after positioning in the vicinity of and in the mould, the cooling of the liners C is in fact negligible.
  • the desired result can consequently easily be achieved by setting the pre- heating temperature at a level higher than the final desired temperature level to an extent exactly equal to the amount of cooling considered above.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
EP98830495A 1998-08-11 1998-08-11 Verfahren und System zur Herstellung eines Gussteils, versehen mit einem Insert Withdrawn EP0979697A1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP98830495A EP0979697A1 (de) 1998-08-11 1998-08-11 Verfahren und System zur Herstellung eines Gussteils, versehen mit einem Insert
MX9907388A MXPA99007388A (es) 1998-08-11 1999-08-10 Un metodo y un sistema para la fabricacion de piezas coladas con piezas insertas.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP98830495A EP0979697A1 (de) 1998-08-11 1998-08-11 Verfahren und System zur Herstellung eines Gussteils, versehen mit einem Insert

Publications (1)

Publication Number Publication Date
EP0979697A1 true EP0979697A1 (de) 2000-02-16

Family

ID=8236755

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98830495A Withdrawn EP0979697A1 (de) 1998-08-11 1998-08-11 Verfahren und System zur Herstellung eines Gussteils, versehen mit einem Insert

Country Status (2)

Country Link
EP (1) EP0979697A1 (de)
MX (1) MXPA99007388A (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10012787A1 (de) * 2000-03-16 2001-09-20 Volkswagen Ag Verfahren zur Herstellung von Leichtmetallgussteilen mit eingegossenen Buchsen und Buchse zum Eingiessen
ES2184582A1 (es) * 2000-11-24 2003-04-01 Caspro Sa Sistema para obtener por fundicion piezas de griferia y similares

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62197266A (ja) * 1986-02-20 1987-08-31 Honda Motor Co Ltd 繊維強化金属体の鋳造方法および鋳型
US4738298A (en) * 1985-07-04 1988-04-19 Honda Giken Kogyo Kabushiki Kaisha Process for casting cylinder block blanks made of light alloy
JPH02220754A (ja) * 1989-02-20 1990-09-03 Suzuki Motor Co Ltd 複合材の高圧鋳造装置
JPH03155450A (ja) * 1989-11-09 1991-07-03 Tokai Carbon Co Ltd 複合摺動部材の製造方法
JPH03268855A (ja) * 1990-03-19 1991-11-29 Toyota Motor Corp 金属基複合材料部材の製造方法
JPH0557420A (ja) * 1991-09-02 1993-03-09 Ikegai Corp スクリユの製造方法及び該方法により製造されるスクリユ

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4738298A (en) * 1985-07-04 1988-04-19 Honda Giken Kogyo Kabushiki Kaisha Process for casting cylinder block blanks made of light alloy
JPS62197266A (ja) * 1986-02-20 1987-08-31 Honda Motor Co Ltd 繊維強化金属体の鋳造方法および鋳型
JPH02220754A (ja) * 1989-02-20 1990-09-03 Suzuki Motor Co Ltd 複合材の高圧鋳造装置
JPH03155450A (ja) * 1989-11-09 1991-07-03 Tokai Carbon Co Ltd 複合摺動部材の製造方法
JPH03268855A (ja) * 1990-03-19 1991-11-29 Toyota Motor Corp 金属基複合材料部材の製造方法
JPH0557420A (ja) * 1991-09-02 1993-03-09 Ikegai Corp スクリユの製造方法及び該方法により製造されるスクリユ

Non-Patent Citations (5)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 012, no. 045 (M - 667) 10 February 1988 (1988-02-10) *
PATENT ABSTRACTS OF JAPAN vol. 014, no. 523 (M - 1049) 16 November 1990 (1990-11-16) *
PATENT ABSTRACTS OF JAPAN vol. 015, no. 381 (M - 1162) 26 September 1991 (1991-09-26) *
PATENT ABSTRACTS OF JAPAN vol. 016, no. 083 (M - 1216) 28 February 1992 (1992-02-28) *
PATENT ABSTRACTS OF JAPAN vol. 017, no. 365 (M - 1442) 9 July 1993 (1993-07-09) *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10012787A1 (de) * 2000-03-16 2001-09-20 Volkswagen Ag Verfahren zur Herstellung von Leichtmetallgussteilen mit eingegossenen Buchsen und Buchse zum Eingiessen
DE10012787B4 (de) * 2000-03-16 2008-04-10 Volkswagen Ag Verfahren zur Herstellung von Leichtmetallgussteilen mit eingegossenen Buchsen
ES2184582A1 (es) * 2000-11-24 2003-04-01 Caspro Sa Sistema para obtener por fundicion piezas de griferia y similares
ES2184582B1 (es) * 2000-11-24 2004-08-16 Caspro, S.A. Sistema para obtener por fundicion piezas de griferia y similares.

Also Published As

Publication number Publication date
MXPA99007388A (es) 2005-01-10

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