EP0730922A1 - Procédé de fabrication de pièces métalliques coulées qui sont liées au béton ultérieurement - Google Patents

Procédé de fabrication de pièces métalliques coulées qui sont liées au béton ultérieurement Download PDF

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Publication number
EP0730922A1
EP0730922A1 EP95103388A EP95103388A EP0730922A1 EP 0730922 A1 EP0730922 A1 EP 0730922A1 EP 95103388 A EP95103388 A EP 95103388A EP 95103388 A EP95103388 A EP 95103388A EP 0730922 A1 EP0730922 A1 EP 0730922A1
Authority
EP
European Patent Office
Prior art keywords
concrete
ring
model
permanent
edge
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Withdrawn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
EP95103388A
Other languages
German (de)
English (en)
Inventor
Thomas Dernbach
Alfred Fuchs
Horst Heimann
Stefan Kirch
Bernd Thorn
Bernhard Weiss
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.)
Aqseptence Group GmbH
Original Assignee
Passavant Werke AG and Co KG
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 Passavant Werke AG and Co KG filed Critical Passavant Werke AG and Co KG
Priority to EP95103388A priority Critical patent/EP0730922A1/fr
Publication of EP0730922A1 publication Critical patent/EP0730922A1/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Withdrawn legal-status Critical Current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
    • B22C9/22—Moulds for peculiarly-shaped castings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C23/00—Tools; Devices not mentioned before for moulding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C7/00—Patterns; Manufacture thereof so far as not provided for in other classes
    • B22C7/005—Adjustable, sectional, expandable or flexible patterns
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C7/00—Patterns; Manufacture thereof so far as not provided for in other classes
    • B22C7/02—Lost patterns
    • B22C7/023—Patterns made from expanded plastic materials
    • 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

Definitions

  • the invention relates to castings that are later connected to concrete.
  • Such castings are, in particular, manhole covers which have an open cavity for filling with concrete and which are designed as a shell with an outer support edge.
  • the concrete filling is used to save cast iron.
  • the concrete lies above the neutral bending moment line and is therefore only subjected to pressure when loaded. Nevertheless, it is important that there is an intimate, inseparable connection between cast iron and concrete.
  • Dynamic traffic loads can lead to micro-movements on the connection surface, which can destroy the connection.
  • the area enlargement can take the form of nubs, waves, ribs (DE-U-78 31 227) or edge waves (DE-U-92 06 734).
  • Another proposal to improve the connection is aimed at hook-shaped concrete anchors which are cast onto the cover shell (DE-U-81 28 885). Because of the high workload for inserting the cores or anchors, it has recently been proposed to design the shape for the curved concrete anchors as flexible pins on the cover model (DE-C-41 42 259). When the molding sand is introduced and solidified, the pins bend to the side and can be pulled out while stretching.
  • Such concrete anchors can only be placed in the bottom of the lid shell. This does not improve the connection of the concrete with the cast iron in the edge area of the cover shell.
  • the concrete filling would also be covered on the top in such a lid and could no longer come loose.
  • the casting of such an edge projection fails because the permanent model for the top side of the lid can then no longer be removed from the mold.
  • the process of inserting a core for the recess in the lid cavity is very complex.
  • the task of casting the edge projection without a core is achieved according to the invention in that the permanent model for the inner wall of the cavity in the cover shell has a ring at the point at which the inward edge projection is cast on, which before the demolding of the Permanent model is expanded to the clear diameter of the recess underneath.
  • Another possibility for solving this problem is the method of removing shaped sand for casting the edge projection on the sand mold after the demoldable permanent model has been removed from the mold, in particular using a turning tool or a milling cutter.
  • the processed molding sand either falls down automatically from the molding box on top or is thrown off when turning. Both process variants do not require cores and can easily be practiced in continuous operation.
  • the permanent model 1 for the inner wall 2 of the cover shell is at the bottom and the molding box 3 is placed on and already filled with sand 4.
  • the permanent model has an annular tube 6, which has the shape of the projection as an outer profile. It is attached to the model and connected to a suction air line 7, through which the ring hose is emptied before the molding box is lifted off and then assumes the shrunk (dashed line) state. Now the molding box can be lifted off the model without resistance. The ring hose is inflated again to form the next bale of sand.
  • the expandable and shrinkable form ring is designed as a double wedge ring 16.
  • the lower wedge 17 has the inclined surface on the inside and can be pressed upwards by means of a plunger 18, so that the upper wedge ring 19, which has the counter inclined surface on the outside and is open at least at one point on the circumference, is spread under contact with the counter-holder 20 and thereby withdrawing from the molding sand.
  • a lost molded ring 22 made of rigid foam plastic is placed on the permanent model 21 according to FIG. 3 where the projection is later to be cast on.
  • the ring is enclosed by the molding sand and remains in the sand mold when the mold bale is lifted off. It is gasified without residue when the liquid cast iron penetrates; the cast iron occupies its space.
  • the embodiment according to FIG. 2 is also suitable for an edge projection that is interrupted several times on the circumference.
  • the short wedge ring sections result in several short protrusions, which are also ideally suited for clamping the filling concrete.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Devices For Post-Treatments, Processing, Supply, Discharge, And Other Processes (AREA)
EP95103388A 1995-03-09 1995-03-09 Procédé de fabrication de pièces métalliques coulées qui sont liées au béton ultérieurement Withdrawn EP0730922A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP95103388A EP0730922A1 (fr) 1995-03-09 1995-03-09 Procédé de fabrication de pièces métalliques coulées qui sont liées au béton ultérieurement

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP95103388A EP0730922A1 (fr) 1995-03-09 1995-03-09 Procédé de fabrication de pièces métalliques coulées qui sont liées au béton ultérieurement

Publications (1)

Publication Number Publication Date
EP0730922A1 true EP0730922A1 (fr) 1996-09-11

Family

ID=8219055

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95103388A Withdrawn EP0730922A1 (fr) 1995-03-09 1995-03-09 Procédé de fabrication de pièces métalliques coulées qui sont liées au béton ultérieurement

Country Status (1)

Country Link
EP (1) EP0730922A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3090429A1 (fr) * 2018-12-19 2020-06-26 Safran Aircraft Engines Fabrication de pièces par fonderie en cire perdue

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1034617A (en) * 1965-03-13 1966-06-29 Ford Motor Co Methods of making cores for castings
DE1259024B (de) * 1965-09-21 1968-01-18 Fischer Ag Georg Giessereimodell mit Losteilen, insbesondere fuer Maschinenformerei
FR2233118A1 (fr) * 1973-06-15 1975-01-10 Caterpillar Tractor Co
JPS57168746A (en) * 1981-04-10 1982-10-18 Kubota Ltd Pattern for casting by air bag system
WO1985004826A1 (fr) * 1984-04-21 1985-11-07 Buderus Aktiengesellschaft Procede de fabrication de pieces coulees et modele pour realiser ce procede
JPS63299844A (ja) * 1987-05-29 1988-12-07 Keihin Seiki Mfg Co Ltd 射出成形方法
EP0459486A2 (fr) * 1990-05-30 1991-12-04 Nkk Corporation Modèle pour fabriquer des coquilles
DE9206734U1 (fr) * 1992-05-18 1992-08-06 Passavant-Werke Ag, 6209 Aarbergen, De
GB2269771A (en) * 1992-07-30 1994-02-23 Masaru Nemoto Method of moulding using a core of non-sand material
JPH06192755A (ja) * 1992-12-24 1994-07-12 Yamaichi Syst Purodeyuusu:Kk アルミニウムのホットドロスの固化方法

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1034617A (en) * 1965-03-13 1966-06-29 Ford Motor Co Methods of making cores for castings
DE1259024B (de) * 1965-09-21 1968-01-18 Fischer Ag Georg Giessereimodell mit Losteilen, insbesondere fuer Maschinenformerei
FR2233118A1 (fr) * 1973-06-15 1975-01-10 Caterpillar Tractor Co
JPS57168746A (en) * 1981-04-10 1982-10-18 Kubota Ltd Pattern for casting by air bag system
WO1985004826A1 (fr) * 1984-04-21 1985-11-07 Buderus Aktiengesellschaft Procede de fabrication de pieces coulees et modele pour realiser ce procede
JPS63299844A (ja) * 1987-05-29 1988-12-07 Keihin Seiki Mfg Co Ltd 射出成形方法
EP0459486A2 (fr) * 1990-05-30 1991-12-04 Nkk Corporation Modèle pour fabriquer des coquilles
DE9206734U1 (fr) * 1992-05-18 1992-08-06 Passavant-Werke Ag, 6209 Aarbergen, De
GB2269771A (en) * 1992-07-30 1994-02-23 Masaru Nemoto Method of moulding using a core of non-sand material
JPH06192755A (ja) * 1992-12-24 1994-07-12 Yamaichi Syst Purodeyuusu:Kk アルミニウムのホットドロスの固化方法

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 10, no. 267 (M - 516) 10 September 1986 (1986-09-10) *
PATENT ABSTRACTS OF JAPAN vol. 13, no. 130 (M - 808) 30 March 1989 (1989-03-30) *
PATENT ABSTRACTS OF JAPAN vol. 7, no. 12 (M - 186)<1157> 19 January 1983 (1983-01-19) *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3090429A1 (fr) * 2018-12-19 2020-06-26 Safran Aircraft Engines Fabrication de pièces par fonderie en cire perdue
US10906089B2 (en) 2018-12-19 2021-02-02 Safran Aircraft Engines Manufacture of parts using the lost wax method

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