EP0928655A1 - Procédé et bouchon pour rendre étanche un noyau d'une pièce coulée - Google Patents

Procédé et bouchon pour rendre étanche un noyau d'une pièce coulée Download PDF

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Publication number
EP0928655A1
EP0928655A1 EP99200021A EP99200021A EP0928655A1 EP 0928655 A1 EP0928655 A1 EP 0928655A1 EP 99200021 A EP99200021 A EP 99200021A EP 99200021 A EP99200021 A EP 99200021A EP 0928655 A1 EP0928655 A1 EP 0928655A1
Authority
EP
European Patent Office
Prior art keywords
plug
core hole
casting
deforming
secured
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Withdrawn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
EP99200021A
Other languages
German (de)
English (en)
Inventor
Hendrikus Louis Gerardus Marie Giesen
Jan Marie Arthur De Ridder
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.)
Metaalgieterij G Giesen BV
Original Assignee
Metaalgieterij G Giesen BV
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 Metaalgieterij G Giesen BV filed Critical Metaalgieterij G Giesen BV
Publication of EP0928655A1 publication Critical patent/EP0928655A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F11/00—Arrangements for sealing leaky tubes and conduits
    • F28F11/02—Arrangements for sealing leaky tubes and conduits using obturating elements, e.g. washers, inserted and operated independently of each other
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D31/00—Cutting-off surplus material, e.g. gates; Cleaning and working on castings
    • B22D31/002—Cleaning, working on castings

Definitions

  • the invention relates to a method for sealing a core hole of a casting with a sealing plug, wherein the plug is fittingly inserted into the core hole.
  • Such method is known from Dutch patent application 94.01864.
  • cores are used which are laid in a mold.
  • the cores are supported in one or more places in the mold, as a result of which the casting, after it is manufactured and the cores are removed, comprises a number of openings to be referred to as core holes. These openings must be closed before the casting in question can be used for, for instance, passing water.
  • the plug which has a solid body with a circular groove in its outer face, which groove accommodates a springy sealing ring which extends out of the groove.
  • the plug is pressed into the core hole, while the outer longitudinal edge of the sealing ring, after positioning of the plug, cuts into the wall of the core hole and prevents the plug from being pressed out.
  • the plug is directly secured when it is being pressed into the core hole.
  • This known method has the drawback that for obtaining a proper sealing, an O-ring should be included between the end face of the plug and a stop face in the core hole.
  • the core hole should have a special shape with at least a relatively accurately processed end face, which has a cost-increasing effect.
  • an O-ring should be used, which is unprofitable in terms of material usage and labor costs.
  • a further drawback of this known method is that at the end of the service life of the casting, the plug must be removed to enable separation of the typically rubber O-ring and the steel plug from the casting, for separate residual processing thereof. This is costly and technically undesirable.
  • the plugs to be used in this known method are relatively costly.
  • the plugs must be removed, while the sealing means used are moreover already highly environmentally polluting by themselves.
  • the object of the present invention is to provide a method of the type described in the preamble of the main claim, wherein the drawbacks mentioned of the known methods are avoided, while the advantages thereof are retained.
  • a method according to the invention is characterized by the features of the characterizing part of the main claim.
  • plugs manufactured from a material that can be recycled together with the material of the casting prevents the necessity of removing the plugs at the end of the service life for separate processing.
  • the plugs material which corresponds to the material of the casting at least to a high degree
  • recycling of such castings is possible in a particularly simple manner.
  • the plug is secured in the core hole for sealing at least substantially through deformation, the mounting thereof is possible in a particularly quick and simple manner, while, moreover, no fouling substances such as liquid or non-liquid packing means have be to included in the core hole. This, too, is advantageous in terms of production, environment, as well as economy.
  • a method according to the invention is characterized by the features of claim 3.
  • Deforming the plug by means of a pressure fluid offers the advantage of obtaining a uniform distribution of the pressure over the surface area to be deformed, which pressure can be set and controlled in a particularly simple manner.
  • an optimum fit of the plug within the core hole is in each case obtained, also if this were formed slightly irregularly.
  • a particularly effective sealing can be obtained in a relatively fast and simple manner, without requiring that the relevant opening undergoes particular preliminary or finishing operations.
  • a method according to the invention is characterized by the features of claim 4.
  • the at least partially hollow design of the plug offers the advantage that a relatively thin and readily deformable wall part is obtained which, during or after the insertion of the plug into the core hole, can be deformed at least partially. This involves securement of at least the deformed portion of the plug behind at least a portion of the circumferential wall of the core hole.
  • the at least partially plastic deformation offers the advantage of ensuring a permanent securement of the sealing plug. Moreover, when the plug is also deformed slightly elastically, a permanent closing force is obtained which will provide sufficient sealing action also during heat deformation of the parts of the casting. Moreover, it is possible to further adjust or increase the sealing action afterwards.
  • the plug is preferably deformed in the core hole, but it will be appreciated that it is also possible to deform a portion of the material of the casting surrounding the core hole around the plug in a comparable manner, possibly in combination with deformation of the plug. Deformation of the plug can be effected in a simpler manner than deformation of the casting.
  • the present invention moreover relates to a casting manufactured from aluminum or an aluminum alloy, characterized by the features of claim 7.
  • the use of aluminum or aluminum alloys for castings of the subject type is particularly advantageous, in particular for casting channel-carrying products such as heat exchangers and the like.
  • the water-carrying channels can be directly cast integrally therewith by means of cores incorporated into a mold, which cores, after casting, can be removed via the core holes.
  • plugs manufactured from aluminum or an aluminum alloy offers the advantages mentioned in respect of the above-described method.
  • aluminum offers the advantage of being relatively elastic, well- deformable, thermally sufficiently stable and having a good heat conduction.
  • aluminum offers the advantage of being relatively light and sufficiently corrosion resistant.
  • a casting according to the invention is characterized by the features of claim 11.
  • a plug can be manufactured from relatively little material, which plug can readily be deformed in the core hole.
  • a deforming tool is inserted, by the deforming portion thereof, into the space formed inside the plug, whereupon by means of the deforming tool, at least a portion of the circumferential wall can at least be radially displaced for a sealing plastic, preferably combined plastic and elastic deformation thereof.
  • an environmentally harmless, preferably natural sealing means can be provided in the core hole and/or on the plug, for instance a greasy substance which is subsequently compressed between the plug and the core hole.
  • a greasy substance which is subsequently compressed between the plug and the core hole.
  • the present invention further relates to a plug for use in a method or casting according to the invention.
  • the invention further relates to a heat exchanger comprising a casting according to the invention and to a deforming tool for securing a plug in a core hole according to the invention, which deforming tool is characterized by the features of claim 15.
  • the invention moreover relates to the use of a hydromechanical expansion unit, characterized by the features of claim 18.
  • Fig. 1 shows a casting 1, for instance an aluminum heat exchanger, comprising a water-carrying channel 2.
  • a core formed from, for instance, core sand was included during casting.
  • a core is positioned on a number of support points in a mold, whereupon a molding material is provided around the core.
  • the core is removed from the casting.
  • the space provided in the casting by the core or cores then defines a water-carrying channel 2.
  • the wall of the casting 1 has an opening 3 connecting the channel 2 to the surroundings 4.
  • a number of openings 3 may further be formed through which the core is removed as one whole or as loose core sand.
  • the openings 3 to be referred to as core holes should be sealed.
  • a sealing plug 5 is used. In each core hole 3 to be sealed, such plug 5 can readily be provided.
  • the plug 5 comprises a body 6 having a cylindrical longitudinal wall 9, closed on a first side by a bottom face 8. From the opposite side of the longitudinal wall 9, a supporting collar 7 extends outwards.
  • the plug 5 is substantially cylindrical and is manufactured from material comparable to that of the casting 1, in the present case from an aluminum alloy.
  • 'comparable material' should be understood to mean preferably a material or alloy having a high percentage, for instance more than 80%, more in particular more than 90% and preferably more than 95%, of the material or alloy of the casting or possibly a material that can at least be recycled therewith.
  • the plug 5 is preferably manufactured from an aluminum alloy having a high extension and being insusceptible to stress corrosion between the plug and the casting, as will be explained in more detail hereinbelow.
  • 'High extension' should at any rate be understood to mean an extension of more than 5%, for instance 10% or more.
  • alloy an alloy based on Aluminum and Magnesium can for instance be used. These examples should not be construed as being limitative in any way.
  • the core hole 3 comprises a first, cylindrical part 10 having a diameter D 1 approximately corresponding to the outside diameter D of the longitudinal wall 9 of the plug 5.
  • a second cylindrical part 11 Concentrically adjoining the first cylindrical part 10 is a second cylindrical part 11 having a diameter D 2 which is clearly larger than the diameter D 1 of the first cylindrical part 10.
  • the transition 12 between the first cylindrical part 10 and the second cylindrical part 11 is formed by a frusto-conical part diverging in the inserting direction P and having a seal-increasing effect, as will be described in more detail hereinbelow.
  • a rolled groove 13 Provided in the first cylindrical part 10, in the circumferential wall thereof, is a rolled groove 13 whose function will be further described hereinbelow.
  • the length L of the rolling plug 5 below the supporting collar 7 is slightly greater than the length L 1 of the first cylindrical part 10 together with the transition part 12.
  • Fig. 2 shows the rolling plug 5 in the position in which it is included in the core hole 3. It is clearly demonstrated that the supporting collar 7 abuts against the outer side of the casting 1, while the end wall 8 extends inside the second cylindrical part 11 of the core hole 3. In this position, the plug 5 is still freely movable. Subsequently, a nose portion of a forming tool 20, to be further described hereinbelow, is introduced into the space 14 within the plug 5, whereby the longitudinal wall 9 is deformed outwards, i.e. in radial direction, such that the outer wall of the longitudinal wall 9 abuts against the inner wall of at least the first cylindrical part 10, the rolled groove 13 and a portion of the transition part 12 of the core hole 3. Thus, a combined plastic and elastic deformation of the aluminum is effected, to create an entirely watertight sealing of the core hole.
  • the portion of the longitudinal wall 9 located adjacent the bottom face 8 abuts against the wall of the frusto-conical transition portion 12, slot corrosion between the plug 5 and the casting 1 is prevented. Since a portion of the longitudinal wall 9 is deformed into the rolled groove 13, the press-out resistance and the sealing of the plug relative to the casting are increased. Moreover, this enables the influences of any temperature fluctuations between the plug 5 and the casting 1 to be taken up even more effectively, such that the sealing action of the plug is retained at all times. Because the bottom face 8 is included within the second cylindrical part 12 of the core hole 3, the plug 5 is prevented from extending into the water channel 2, which has the advantage that the influence of the plug on the flow pattern within the water channel is prevented, or at least minimized.
  • Fig. 4 shows an alternative embodiment of a casting 101 with a core hole 103 sealed by a plug 105.
  • the rolled groove 13 is replaced by two rolled ribs 113 extending parallel to each other, over which the rolling plug 105 is deformed. It will be understood that thus, a watertight sealing between the plug and the casting is obtained in a comparable manner.
  • any desired number of rolled grooves 13 and/or rolled ribs 113 can be provided, while moreover, such grooves and ribs can be dispensed with completely if deformation of the plug in the frusto-conical transition part 12 and/or the second cylindrical portion 11 is sufficient. Many variations thereto are possible.
  • a hollow plug 5, 105 is used in each case.
  • a plug which is entirely or at least highly solid while included in the core hole is a collar which lies ahead in the inserting direction P, against which collar the plug abuts by its bottom face during insertion. Subsequently, the plug can then be upset in the inserting direction, whereby a radial deformation of the plug will occur and the desired sealing is obtained. This requires more force and more material than in the case where the hollow plugs are used.
  • Fig. 5 diagrammatically shows the nose piece 21 of a deforming tool 20 for use with the hollow plugs 5, 105.
  • This deforming tool is a rolling tool.
  • the nose part 21 comprises for instance two rolling wheels 22' and 22'' that are fixedly disposed or rotatable about a first axis of rotation A 1 .
  • the first rolling wheel 22' is entirely at the front of the nose piece 21, the second rolling wheel 22'' is spaced from the first rolling wheel 22'.
  • the second rolling wheel 22'' is at the level of the circumferential groove 13.
  • the nose piece 21 is arranged on a rotating base piece 23 for displacement in radial direction and can thereby be driven in rotational sense.
  • the base piece 23 is rotatable about a second axis of rotation A 2 .
  • the distance between the first axis of rotation A 1 and the second axis of rotation A 2 can be set and adjusted to the diameter of the plug 5.
  • the nose piece 21 when the nose piece 21 is inserted into the plug, it can be rotated around the axis A 2 by means of the base piece 23, and the nose piece can be displaced in radial sense such that the distance between the axes of rotation A 1 and A 2 is increased while it presses away the longitudinal wall 9 outwards to assume the condition shown in Fig. 3. After that, the nose piece 21 can be placed back and the tool can be removed.
  • the nose piece 21 in itself also contributes to the deformation of the longitudinal wall 9. To this end, the entire nose piece may be designed for rotation about the first axis of rotation A 1 .
  • Fig. 6 diagrammatically shows a plug according to Fig. 2.
  • the plug 5 comprises a hollow portion 14 into which a front end 32 of a deforming tool 31 can be inserted.
  • This front end 32 has a substantially cylindrical shape and can be received in the space 14 with a slight play.
  • Provided in the outer circumference of the deforming tool 31 are two spaced apart, annular grooves 34 which accommodate sealing rings 35.
  • the sealing rings 35', 35'' abut against the inside of the longitudinal wall 9 or can be moved thereagainst and accordingly, during deformation, enclose a chamber 39 between the two sealing rings 35', 35'', the outer wall of the deforming tool 31 and the inside of the longitudinal wall 9 (Fig. 6A).
  • a channel 33 extends over a portion of the length of the deforming tool 31, which channel on the opposite side opens into a number of radial discharge channels 37 opening into the chamber 39.
  • the axial channel 33 is connected to pump means 40 which are connected to a storage vessel 41 for a pressure fluid, in particular water or oil.
  • a pressure fluid in particular water or oil.
  • the liquid can be fed under pressure by the pump means 40 from the storage vessel 41 into the chamber via the axial channel 33 and the radial channels 37, in such a manner that the cylindrical wall 9 of the plug 5 is pressed away outwards, i.e. plastically deformed into abutment against the groove B in the core hole.
  • the use of the fluid offers the advantage of obtaining a uniform pressure distribution and an exact fit of the plug 5 in the core hole 3, also if the core hole is deformed slightly irregularly.
  • the pressure can be removed from the chamber 39, for instance by drawing off the pressure medium, after which the deforming tool 31 can be pulled from the plug 5 again.
  • a sealing of the chamber 39 can be effected in different manners, in respect of which it may in particular be important that a sufficiently pressure-tight sealing is obtained which may or may not follow any deformation of the longitudinal wall 9.
  • an environmentally harmless sealing substance for instance grease
  • Such substance does not affect the recycling capability of the casting.
  • the design of a plug and an associated core hole in a casting according to the invention may be other than cylindrical, for instance frusto-conical.
  • the core hole may for instance be frusto-conical, the top thereof facing outwards, while the plug is for instance cylindrical, or at least less frusto-conical.
  • the longitudinal wall thereof is then moved against the conical surface of the core hole, causing the plug to be secured behind the top of the core hole.
  • a method and casting according to the invention are in particular suitable for a heat exchanger, but other apparatus may of course also be manufactured thereby.
  • other material combinations may be used, as long as they are jointly recyclable as casting.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Continuous Casting (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
EP99200021A 1998-01-07 1999-01-06 Procédé et bouchon pour rendre étanche un noyau d'une pièce coulée Withdrawn EP0928655A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL1007976 1998-01-07
NL1007976A NL1007976C2 (nl) 1998-01-07 1998-01-07 Werkwijze en afdichtstop voor het afdichten van een kerngat in een gietstuk.

Publications (1)

Publication Number Publication Date
EP0928655A1 true EP0928655A1 (fr) 1999-07-14

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EP99200021A Withdrawn EP0928655A1 (fr) 1998-01-07 1999-01-06 Procédé et bouchon pour rendre étanche un noyau d'une pièce coulée

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EP (1) EP0928655A1 (fr)
NL (1) NL1007976C2 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002055911A2 (fr) * 2001-01-15 2002-07-18 Ukm Umformtechnik Und Kraftfahrzeugkomponenten Gmbh Dispositif pour obturer de maniere etanche des alesages sollicites en pression
EP2023031A1 (fr) 2007-08-10 2009-02-11 Hoerbiger Automatisierungstechnik Holding GmbH Procédé de fermeture étanche à la pression d'un trou de forage et boîtier sous pression
WO2009112400A1 (fr) * 2008-03-11 2009-09-17 Alstom Technology Ltd Objet moulé coulé en creux
EP3404297B1 (fr) * 2017-05-19 2024-06-19 E. Winkemann GmbH Dispositif obturateur destiné à fermer un alesage, ainsi qu'un outil de préhension d'un tel dispositif

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3307731A (en) * 1965-03-24 1967-03-07 Seltzer Harry Plugging device
US3814136A (en) * 1972-06-30 1974-06-04 R Johnson Pressure sealing casting plug
GB2068093A (en) * 1980-01-24 1981-08-05 Potterton Int Ltd Heat exchangers
GB2078899A (en) * 1980-06-06 1982-01-13 Production Eng Res Plug
EP0122610A1 (fr) * 1983-04-14 1984-10-24 Combustion Engineering, Inc. Bouchon pour tube à fixation mécanique
EP0270053A1 (fr) * 1986-12-01 1988-06-08 Westinghouse Electric Corporation Dispositif et méthode pour le tamponnage d'un conduit
US4930459A (en) * 1989-07-21 1990-06-05 Sdi Operating Partners, L.P. Freeze plug
DE4415341A1 (de) * 1994-05-02 1995-11-09 Teves Gmbh Alfred Verschlußvorrichtung zum Verschließen von Druckmittel führenden Kanälen in einem Gehäuse
NL9401864A (nl) * 1994-11-08 1996-06-03 Dejatech Bv Werkwijze voor het afdichten van een kerngat van een gietstuk en afdichtstop voor mediumvoerende gietstukken.

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3307731A (en) * 1965-03-24 1967-03-07 Seltzer Harry Plugging device
US3814136A (en) * 1972-06-30 1974-06-04 R Johnson Pressure sealing casting plug
GB2068093A (en) * 1980-01-24 1981-08-05 Potterton Int Ltd Heat exchangers
GB2078899A (en) * 1980-06-06 1982-01-13 Production Eng Res Plug
EP0122610A1 (fr) * 1983-04-14 1984-10-24 Combustion Engineering, Inc. Bouchon pour tube à fixation mécanique
EP0270053A1 (fr) * 1986-12-01 1988-06-08 Westinghouse Electric Corporation Dispositif et méthode pour le tamponnage d'un conduit
US4930459A (en) * 1989-07-21 1990-06-05 Sdi Operating Partners, L.P. Freeze plug
DE4415341A1 (de) * 1994-05-02 1995-11-09 Teves Gmbh Alfred Verschlußvorrichtung zum Verschließen von Druckmittel führenden Kanälen in einem Gehäuse
NL9401864A (nl) * 1994-11-08 1996-06-03 Dejatech Bv Werkwijze voor het afdichten van een kerngat van een gietstuk en afdichtstop voor mediumvoerende gietstukken.

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002055911A2 (fr) * 2001-01-15 2002-07-18 Ukm Umformtechnik Und Kraftfahrzeugkomponenten Gmbh Dispositif pour obturer de maniere etanche des alesages sollicites en pression
WO2002055911A3 (fr) * 2001-01-15 2003-02-20 Ukm Umformtechnik Und Kraftfah Dispositif pour obturer de maniere etanche des alesages sollicites en pression
EP2023031A1 (fr) 2007-08-10 2009-02-11 Hoerbiger Automatisierungstechnik Holding GmbH Procédé de fermeture étanche à la pression d'un trou de forage et boîtier sous pression
EP2023031B1 (fr) * 2007-08-10 2015-04-29 Hoerbiger Automotive Komfortsysteme GmbH Procédé de fermeture étanche à la pression d'un trou de forage et boîtier sous pression
WO2009112400A1 (fr) * 2008-03-11 2009-09-17 Alstom Technology Ltd Objet moulé coulé en creux
US8721284B2 (en) 2008-03-11 2014-05-13 Alstom Technology Ltd. Hollow-cast casting with a closure device
EP3404297B1 (fr) * 2017-05-19 2024-06-19 E. Winkemann GmbH Dispositif obturateur destiné à fermer un alesage, ainsi qu'un outil de préhension d'un tel dispositif

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