EP0065208B2 - Verfahren und Vorrichtung zur Herstellung von dickwandigen, hohlen Gussstücken - Google Patents

Verfahren und Vorrichtung zur Herstellung von dickwandigen, hohlen Gussstücken Download PDF

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Publication number
EP0065208B2
EP0065208B2 EP82103856A EP82103856A EP0065208B2 EP 0065208 B2 EP0065208 B2 EP 0065208B2 EP 82103856 A EP82103856 A EP 82103856A EP 82103856 A EP82103856 A EP 82103856A EP 0065208 B2 EP0065208 B2 EP 0065208B2
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EP
European Patent Office
Prior art keywords
mould
cooling
casting
castings
core
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
Application number
EP82103856A
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German (de)
English (en)
French (fr)
Other versions
EP0065208A1 (de
EP0065208B1 (de
Inventor
Helmut Derp
Horst Dr. Dipl.-Chem. Keese
Elmar Dr. Schlich
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.)
Nukem GmbH
Original Assignee
TNH Transporte und Dienstleistungen Abwicklungsgesellschaft mbH
Thyssen Industrie AG
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Publication date
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6132150&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0065208(B2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by TNH Transporte und Dienstleistungen Abwicklungsgesellschaft mbH, Thyssen Industrie AG filed Critical TNH Transporte und Dienstleistungen Abwicklungsgesellschaft mbH
Priority to AT82103856T priority Critical patent/ATE15338T1/de
Publication of EP0065208A1 publication Critical patent/EP0065208A1/de
Application granted granted Critical
Publication of EP0065208B1 publication Critical patent/EP0065208B1/de
Publication of EP0065208B2 publication Critical patent/EP0065208B2/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • B22C9/24—Moulds for peculiarly-shaped castings for hollow articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
    • B22D27/04—Influencing the temperature of the metal, e.g. by heating or cooling the mould

Definitions

  • the invention relates to a method and an apparatus for the feedless manufacture of thick-walled castings from spheroidal graphite cast iron, in which the shape is built up relentlessly, the castings are cooled and the gates are dimensioned such that the cast iron is frozen in them before the eutectic solidification of the Casting uses.
  • the mold is closed with the exception of the gates, and the cast iron does not flow again after the mold has been filled from funnel-shaped feeders which have been removed from different parts of the mold, but only through the gates for a short time.
  • Thick-walled, container-like castings made of spheroidal graphite cast iron are e.g. required as a transport container for used fuel elements from nuclear power plants. This places particularly high demands on the quality of the casting. It must have a fine-grained and tough cast structure that is free from volume deficit errors, in particular free from micropores.
  • Thick-walled sand castings have long solidification times, since the considerable amounts of heat released can only be dissipated via the insulating molding material. In the case of spheroidal graphite cast iron, this can result in a rough globulitic cast structure. In addition, under these conditions, flat temperature gradients occur between the residual melt and the solidifying edge shell, which favor the occurrence of volume deficit errors, in particular micropores. In the case of a coarse cellular cast structure, the volume expansion, which predominates locally in graphitic eutectic crystallization and exerts a pressure that saturates to supply, cannot completely feed the micropores. The harmful consequences are micro-voids, which lead to indications in non-destructive testing methods and which limit micro segregation or, in extreme cases, even carbide deposits on the eutectic grain (cell), which impair the toughness of the material.
  • DE-A-28 27 091 it is known in conventional casting of steel into slabs or blocks to build a mold from individual walls from water-cooled cooling boxes.
  • DE-C-665 119 relates to the production of hollow bodies, in particular cast steel hollow bodies in a centrifugal casting mold which rotates about a vertical axis, the lower part of the inner wall of the casting body being additionally cooled with a coolant to counteract the formation of voids.
  • the object of the invention is seen in obtaining a fine-grained, low-segregation and non-porous casting structure in a thick-walled, container-like casting via a steeper temperature gradient which favors the shell-like solidification in conjunction with a shortened solidification time, as is otherwise only possible in thin-walled casting structures Castings can be reached.
  • This object is achieved in a method of the type mentioned at the outset in that for the casting of container-like castings using a mold core and an external mold, the rigid structure affects both the mold core and the external mold and the castings both on their external and on their Be cooled on the inside, the cooling on the inside being metered and regulated by liquid nitrogen evaporating in the system.
  • This effective type of cooling of the core from the inside and the stubborn structure of the core means that the cooling casting is shrunk onto the core, a gap bond is avoided and the good heat transfer is maintained. Due to the unyielding structure of the entire mold, the expansion of the metal during graphitic eutectic solidification has a full effect as an increase in pressure in the mold cavity. That has with the result that the formation of micropores is avoided in the solidifying casting.
  • the invention can be advantageously configured as follows.
  • the cooling of the castings on the outer surface also contributes to the effective pressure increase in the mold cavity during the eutectic solidification.
  • the outer jacket surface must be provided with cooling fins for later practical use, sufficient cooling can be achieved on the outer surface by forming the casting on its outer surface with large cooling fins . Then the outer shape e.g. made of dimensionally stable, cold resin-bonded quartz sand.
  • the cooling of the outer surface of the casting can e.g. with smaller cooling fins or a smooth outer surface, can be improved by a metallic outer shape.
  • the metallic outer shape improves the dissipation of the heat to the outside due to its greater thermal conductivity compared to a ceramic shape and thus convection cooling by the ambient air due to the higher temperature. This can be improved by cooling fins on the outer shape.
  • the metallic outer shape can be metered and controlled by coolants, primarily by liquid, non-flammable coolants that evaporate in the system.
  • the measures to improve the external cooling of the castings promote a shell-like solidification and thereby increase the pressure increase in the residual melt which improves the tightness of the casting during the eutectic solidification.
  • the outer contour of the mold core is formed by a preliminary mold made of sheet steel, on the inner surface of which cooling elements through which coolant is arranged and the space between the lost mold, the cooling elements and the free space inside the mold core is filled with moldable, fine-grained substances.
  • Sheet steel with a thickness of 10 to 20 mm is suitable for the lost shape.
  • the fine-grained substances serve to stabilize the core and promote heat transfer between the lost mold shape and the cooling elements, in which the cooling is effected by the coolant flowing through.
  • the outer surface of the core is generally provided with a size customary in the foundry in order to avoid welding.
  • the cooling elements can be designed as cooling boxes in which inflow and outflow pipes are arranged next to one another in order to enable uniform heat dissipation.
  • the cooling boxes are advantageously held by metallic elements such as wedges and pressed against the lost shape.
  • cooling coils can also be used.
  • the fine-grained substances with which the gaps between the cooling elements, the preformed formwork and the free space are filled can be ceramic molding materials, as are common in foundries.
  • fine-grained metallic materials preferably steel gravel, may also be used, or metallic materials may also be added to the molding material.
  • the outer shape is advantageously made of sheet steel and is provided with cooling elements. These can either be cooling boxes or cooling coils. Additional cooling fins improve heat dissipation.
  • the entire mold was made up of a mold core 6 and a metallic or non-metallic outer mold 3 and the cast piece 1 both on its outer and on its inner surface cooled, the cooling on the inner surface by cooling the mandrel 6 with liquid nitrogen.
  • the gates 2 were dimensioned such that the cast iron solidified in them before the eutectic solidification of the casting 1 began.
  • the outer shape 3 was made of dimensionally stable, cold resin-bonded quartz sand. To produce the outer mold 3, cores 4 were used for the cooling fins 5 to be produced on the outer surface of the casting 1.
  • the lost mold core 6 consisted of an approximately 6 m long cylindrical iron sheet jacket 7 with 15 mm wall thickness with a 30 mm welded-on cover 8. Before the cover 8 was welded on, the cooling boxes 9, 10 were introduced in two levels and with steel wedges 11 pressed against the sheet metal jacket 7. A good cooling of the cooling boxes 9, 10 was achieved by a system of parallel, vertical cooling pipes, distributed over the entire circumference, a lower feed line and an upper discharge line laid alternately and each connected to a feed and discharge ring line. The lid 8 was also provided with a cooler 12. The core 6 was arranged upright. The casting was poured upwards. The casting temperature was 1320 ° C, the amount of magnesium-treated and inoculated iron was 115 t .
  • the composition of the melt corresponded to GGG-40.3, DIN 1693.
  • the approximate dimensions of the casting 1 were in relation to the Length 6 400 mm, the outer diameter with ribs 2 500 mm, the inner diameter 1 200 mm; the floor thickness was 400 mm.
  • the core 6 was cooled with liquid nitrogen in such a way that evaporation occurred when it flowed into the cooling elements 9, 10, 12.
  • Inlets 2 were designed to freeze when the melt in the mold had reached a temperature of 1160 to 1200 ° C. Cooling was maintained throughout the solidification time. The coolant supply was only switched off shortly above the y-a conversion in order not to disturb the ferrite formation. Overall, the setting time was shortened by 56% compared to pure sand casting.
  • the casting was drawn and the fine-grained penetrations in the core were removed, the cooling elements arranged in several planes were removed and finally the formwork, that is, the sheet metal jacket 7 with the cover 8 was removed by cutting and pulling. The rest of the casting was cleaned in the usual way.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Casting Devices For Molds (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
  • Moulding By Coating Moulds (AREA)
EP82103856A 1981-05-13 1982-05-05 Verfahren und Vorrichtung zur Herstellung von dickwandigen, hohlen Gussstücken Expired - Lifetime EP0065208B2 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82103856T ATE15338T1 (de) 1981-05-13 1982-05-05 Verfahren und vorrichtung zur herstellung von dickwandigen, hohlen gussstuecken.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3118928 1981-05-13
DE19813118928 DE3118928A1 (de) 1981-05-13 1981-05-13 Verfahren und vorrichtung zur herstellung von dickwandigen, hohlen gussstuecken

Publications (3)

Publication Number Publication Date
EP0065208A1 EP0065208A1 (de) 1982-11-24
EP0065208B1 EP0065208B1 (de) 1985-09-04
EP0065208B2 true EP0065208B2 (de) 1990-12-27

Family

ID=6132150

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82103856A Expired - Lifetime EP0065208B2 (de) 1981-05-13 1982-05-05 Verfahren und Vorrichtung zur Herstellung von dickwandigen, hohlen Gussstücken

Country Status (7)

Country Link
US (1) US5058655A (ja)
EP (1) EP0065208B2 (ja)
JP (1) JPS5825859A (ja)
AT (1) ATE15338T1 (ja)
CA (1) CA1224325A (ja)
DE (2) DE3118928A1 (ja)
ZA (1) ZA822691B (ja)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007017690A1 (de) 2007-04-14 2008-10-16 Siempelkamp Giesserei Gmbh Verfahren und Vorrichtung zur Herstellung eines Gussteils
CN103990762A (zh) * 2014-05-23 2014-08-20 马鞍山市晨光高耐磨科技发展有限公司 一种专用于环形长铸造件浇注设备
DE102022125056A1 (de) 2022-01-04 2023-07-06 GM Global Technology Operations LLC System und verfahren zur erhöhung der abkühlgeschwindigkeit von sandgussstücken aus metall während der erstarrung

Families Citing this family (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3120221C2 (de) * 1981-05-21 1989-08-10 Siempelkamp Gießerei GmbH & Co, 4150 Krefeld Herstellung von dickwandigen Abschirmtransport- und Lagerbehältern aus sphärolitischem Gußeisen
DE3216327C1 (de) * 1982-05-03 1983-05-19 Siempelkamp Gießerei GmbH & Co, 4150 Krefeld Herstellung von dickwandigen Abschirmtransport- und Lagerbehältern aus sphärolitischem Gußeisen
JPS59105045U (ja) * 1982-12-29 1984-07-14 日産ディーゼル工業株式会社 シリンダライナ−の設置構造
DE3324929A1 (de) * 1983-07-09 1985-01-17 Buderus Ag, 6330 Wetzlar Verfahren zum herstellen eines dickwandigen behaeltergrundkoerpers hoher kerbschlagzaehigkeit
JPH0226745U (ja) * 1988-08-08 1990-02-21
EP0890400B1 (de) * 1997-06-17 2002-07-31 Wärtsilä Schweiz AG Giessverfahren zum Herstellen metallischer Giesslinge
CA2282636A1 (en) * 1999-09-16 2001-03-16 Philippe Viarouge Power transformers and power inductors for low frequency applications using isotropic composite magnetic materials with high power to weight ratio
DE102004027592A1 (de) * 2004-06-05 2005-12-22 Man Nutzfahrzeuge Ag Verfahren und Vorrichtung zum speiserarmen oder speiserlosen Gießen untereutektischer Gusseisenlegierungen
US7342989B2 (en) * 2005-06-23 2008-03-11 Nac International, Inc. Apparatuses and methods for mechanical shielding and cooling
DE102012103884A1 (de) 2012-05-03 2013-11-07 Fritz Winter Eisengiesserei Gmbh & Co. Kg Verfahren zum Gießen eines mit mindestens einer Durchgangsöffnung versehenen Gussteils
RU2634819C2 (ru) * 2013-01-18 2017-11-03 Немак Вернигероде Гмбх Способ литья и литейная форма со специальным питающим каналом для изготовления литых деталей, в частности, блоков цилиндров и головок цилиндров
WO2015051076A1 (en) 2013-10-02 2015-04-09 Nac International, Inc. Systems and methods for transferring spent nuclear fuel from wet storage to dry storage
US9793021B2 (en) 2014-01-22 2017-10-17 Nac International Inc. Transfer cask system having passive cooling
EP3088537A1 (de) * 2015-04-27 2016-11-02 Georg Fischer GmbH Herstellverfahren hpi-gusseisen
CN104941548A (zh) * 2015-05-27 2015-09-30 含山县宏记精工铸造厂 一种化学试剂的混合反应桶
GB201612294D0 (en) * 2016-07-15 2016-08-31 Rolls Royce Plc Method and apparatus for particle injection moulding
CN106862497A (zh) * 2016-12-20 2017-06-20 广西玉柴机器配件制造有限公司 一种铁型覆砂铸造卡车推杆支架的生产方法
CN106799467A (zh) * 2016-12-20 2017-06-06 广西玉柴机器配件制造有限公司 一种铁型覆砂铸造球墨铸铁卡车钢板弹簧座的生产方法
CN106862496A (zh) * 2016-12-20 2017-06-20 广西玉柴机器配件制造有限公司 一种铁型覆砂铸造球墨铸铁卡车端盖的生产方法
CN107377890B (zh) * 2017-07-11 2023-05-12 宜昌船舶柴油机有限公司 提高船用柴油机气缸套内孔耐磨性的方法及装置
CN114147182B (zh) * 2021-12-07 2024-01-23 勤威(天津)工业有限公司 一种砂芯成型高品质高步留支架的铸造模型结构

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DE566085C (de) * 1932-12-10 Fritz Halbrock Kokillenkern zum Giessen von Hohlbloecken
DE665119C (de) * 1937-04-03 1938-09-17 Dr Franz Bartscherer Verfahren und Vorrichtung zum Herstellen von Hohlkoerpern
DE961290C (de) * 1951-01-18 1957-04-04 Otto Junker G M B H Verfahren zum Giessen von legierten Eisengussstuecken
DE1952209A1 (de) * 1968-11-11 1970-09-24 I I Elektrosvarki Im E O Paton Vorrichtung zum Erzeugen von Metallhohlbloecken
AT295765B (de) * 1969-10-13 1972-01-25 Vnii Elektrotermicheskogo Obor Kokille zum Herstellen von Hohlblöcken aus Metall oder Metallegierungen
AU5265273A (en) * 1972-04-08 1974-08-29 Wako Kinzoku Kogyo Co. Ltd a CASTING METHOD AND METAL MOLD ANDA COOLING MOLD USED IN SAW METHOD
JPS5225358B2 (ja) * 1973-07-17 1977-07-07
JPS545820A (en) * 1977-06-17 1979-01-17 Hitachi Metals Ltd Casting method
US4278124A (en) * 1978-04-11 1981-07-14 Kawasaki Steel Corporation Method of producing hollow steel ingot and apparatus therefor
DE2827091A1 (de) * 1978-06-21 1980-01-10 Seybold Rolf Prof Dr Ing Standkokillen fuer brammen und bloecke
DE2831842A1 (de) * 1978-07-20 1980-02-07 Leybold Heraeus Gmbh & Co Kg Dorn fuer kokillen zum elektroumschmelzen von metallen zu hohlbloecken

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007017690A1 (de) 2007-04-14 2008-10-16 Siempelkamp Giesserei Gmbh Verfahren und Vorrichtung zur Herstellung eines Gussteils
CN103990762A (zh) * 2014-05-23 2014-08-20 马鞍山市晨光高耐磨科技发展有限公司 一种专用于环形长铸造件浇注设备
DE102022125056A1 (de) 2022-01-04 2023-07-06 GM Global Technology Operations LLC System und verfahren zur erhöhung der abkühlgeschwindigkeit von sandgussstücken aus metall während der erstarrung
US11766716B2 (en) 2022-01-04 2023-09-26 GM Global Technology Operations LLC System and method of increasing cooling rate of metal sand casting during solidification

Also Published As

Publication number Publication date
ATE15338T1 (de) 1985-09-15
US5058655A (en) 1991-10-22
CA1224325A (en) 1987-07-21
ZA822691B (en) 1983-02-23
EP0065208A1 (de) 1982-11-24
DE3265991D1 (en) 1985-10-10
JPS5825859A (ja) 1983-02-16
DE3118928A1 (de) 1982-12-02
EP0065208B1 (de) 1985-09-04
JPH0329500B2 (ja) 1991-04-24

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