EP0197388A2 - Procédé et dispositif pour compacter des matériaux de moulage de fonderie - Google Patents

Procédé et dispositif pour compacter des matériaux de moulage de fonderie Download PDF

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Publication number
EP0197388A2
EP0197388A2 EP19860103822 EP86103822A EP0197388A2 EP 0197388 A2 EP0197388 A2 EP 0197388A2 EP 19860103822 EP19860103822 EP 19860103822 EP 86103822 A EP86103822 A EP 86103822A EP 0197388 A2 EP0197388 A2 EP 0197388A2
Authority
EP
European Patent Office
Prior art keywords
frame
molding
gas
molding sand
sand
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.)
Granted
Application number
EP19860103822
Other languages
German (de)
English (en)
Other versions
EP0197388A3 (en
EP0197388B1 (fr
Inventor
Dietmar Prof. Dr.-Ing. Boenisch
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.)
Georg Fischer AG
Original Assignee
Georg Fischer AG
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 Georg Fischer AG filed Critical Georg Fischer AG
Priority to AT86103822T priority Critical patent/ATE58659T1/de
Publication of EP0197388A2 publication Critical patent/EP0197388A2/fr
Publication of EP0197388A3 publication Critical patent/EP0197388A3/de
Application granted granted Critical
Publication of EP0197388B1 publication Critical patent/EP0197388B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C15/00—Moulding machines characterised by the compacting mechanism; Accessories therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C15/00—Moulding machines characterised by the compacting mechanism; Accessories therefor
    • B22C15/28—Compacting by different means acting simultaneously or successively, e.g. preliminary blowing and finally pressing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C15/00—Moulding machines characterised by the compacting mechanism; Accessories therefor
    • B22C15/28—Compacting by different means acting simultaneously or successively, e.g. preliminary blowing and finally pressing
    • B22C15/30—Compacting by different means acting simultaneously or successively, e.g. preliminary blowing and finally pressing by both pressing and jarring devices

Definitions

  • the invention relates to a method and a device for compressing foundry molding materials, the molding material being poured or pneumatically introduced into a molding device comprising a model device with one or more models, molding frames and filling frames, and subsequently by means of a compression sensor consisting of a compressed air or combustion engine pulse device or a pressing and / or vibrating device is compacted and the entire or predominant molding sand present in the filling frame is moved into the molding frame.
  • the strength of foundry molding materials is achieved by compacting the loose sand or pneumatically introduced molding sand into the mold frame.
  • the most important compression principles include shaking, vibrating presses, suction and shooting presses, high-pressure presses and, for some years now, pulse compression. with compressed air or combustion of ignitable gas mixtures.
  • the present invention is based on the object of creating methods and devices for compacting foundry molding materials in which the compacting uniformity within a sand mold and thus also the quality of the casting is drastically improved.
  • a method for compressing foundry molding materials the molding material being poured or pneumatically introduced into a molding device comprising a model device with one or more models, molding frame and filling frame, and subsequently by means of a compression transmitter consisting of a compressed air or combustion force pulse device or a pressing and / or vibrating device and thereby moving all or most of the molding sand present in the filling frame into the molding frame
  • a compression transmitter consisting of a compressed air or combustion force pulse device or a pressing and / or vibrating device and thereby moving all or most of the molding sand present in the filling frame into the molding frame
  • the solution according to the invention ensures that loose areas are built up in partial, predeterminable areas of the molding material which lead to improvement of the mobility of the molding sand during the compression of the molding sand.
  • the expanding gas is introduced or brought into effect in such a concentration in partial or selected areas of the molding sand that holes are created in an explosive manner and thus the compressed gas conveys the sand and, due to the pressure exerted, also pre-compresses.
  • small "pre-compressors" are thus present in the second type in the molding sand at locations where the usual compaction is made more difficult by the compression transmitter acting from above and outside.
  • a compressed air introduced into the molding sand a will create loosenable areas depending on their strength, type of application and exposure time. Limitable loosening areas can also be created using a combustible or burned gas. If this is introduced into the molding sand in strong local concentration and ignited immediately, then explosively pronounced holes are obtained in the molding sand as a second type of reduced packing density and the sand is thus transported and compressed by the compressed gas in the sand.
  • the combustible mixture for example gasoline
  • the molding sand in such a way that it is initially distributed in a certain way and only then ignited, then there is only a weak combustion, with the result that the grains of sand stand out from one another and the molding material thus in reached an improved flowable state.
  • the type and amount of the combustible or burnt mixture, the place of introduction and the effect, in particular also the temporal effect, thus allow predeterminable areas of the loosening state and thus corresponding flowability of the molding sand to be created.
  • the expanding gas within the molding sand can be given a direction that determines the flowability of the molding sand.
  • the expanding gas within the molding sand is given an inflow direction which favors a direction of movement of the molding sand corresponding to the degree of difficulty of the model assignment or model execution.
  • the solution according to the invention of creating selected zones of reduced packing density during the compression by the compression transmitter using a gas in the compacting molding sand is possible with the various types of known compression transmitter.
  • the compression transmitter consists of an air pressure pulse device, then in most cases it is advantageous to choose compressed air as the expanding gas to create the loose areas in the molding sand and, if possible, to derive it from the compressed air of the compression transmitter.
  • the compression transmitter is thus a gas or is operated with one, then the gas to be introduced into the molding sand should advantageously also be of the same type in order to create the loose zones. It can thus, provided that the compression transmitter from a Combustion force pulse device exists, a combustion force pulse device may also be provided to create the loose areas in the molding sand.
  • the pulse devices for creating the loose areas in the molding sand can be derived from the pulse devices for compacting the molding sand. This has the advantage that the timing of their effects can be precisely coordinated because, as has been mentioned many times, the loose areas in the molding sand are only created during the compression work period and are no longer available at the end of the compression work.
  • a compression and / or vibrating device is used as the compression device, then it is advantageous in many cases to use compressed air as the expanding gas, as far as the compressed air is generally also used to drive the pressing and / or vibrating device and because the pressing and shaking extends over a period of a few seconds, by using compressed air, the loose areas in the molding sand are obtained during the compression over the correspondingly longer period of compression here.
  • the compressed air pulse molding machine described by way of example in FIG. 1 consists of the model plate 1 with one or more models 2, the molding frame 3, the seated filling frame 4, in the embodiment according to the invention as a double frame with an all-round inner wall 5.
  • the inner wall 5 is provided with longitudinal slots 6, but can also be perforated in a different version with a plurality of holes.
  • the molding space will. . Completed by the pressure chamber bottom 7.
  • a large-area passage 8 for the pulse-triggering medium is hermetically closed by a pneumatically or hydraulically acting pressing device 10 with a large-area valve 9, which is assumed in this example as a simple poppet valve.
  • the pressure chamber 11 is formed by the housing 12, into which the compressed air supply line 13 opens.
  • the compressed air flow 14 comes from the compressed air supply to the foundry or a special compressor station.
  • pressure of 3 to 5 bar, for example, is stored in the pressure chamber 11.
  • the poppet valve 9 is torn up by triggering the pressing device 10.
  • the compressed air sleeps on the back of the mold 15 in a few milliseconds.
  • the loosely poured molding sand 16 is first pushed together in the region 17 of the back of the mold by the air blow and is already considerably compressed there.
  • This compression front 17 is reinforced by the continuously increasing compression pressure 18 until it leads to final compression at the moment of impact on model 2 and model plate 1 by backflow of the molding material.
  • the compressed air immediately after opening the valve 9 - indicated by arrows 21 - in the space between the double-walled filling frame 4 and 5 and all around the slots 6 laterally in the molding sand.
  • the sand Near the entire inner wall of the filling frame 5, the sand is kept loose during the predominant part of the compression, the wall friction remaining virtually eliminated.
  • the sand slides - as indicated by arrows 22 - into the critical edge areas 19, where there is significantly improved strength.
  • the extent of the surrounding loose zone 24 is u. a. determined by the viscosity of the compressed gas, the pressure and the slot width.
  • the slot width can be determined or changed according to the degree of difficulty of the model occupancy 2 and the height of the molding box 3. For example, the slot widths should be designed to be much narrower for the passage of the hot combustion gases of the internal combustion pulse shaping machine than for the cold air of a compressed air pulse shaping machine. Inappropriately wide slots could push the gas too far into the bale and destroy the entire mold.
  • the filling frame 4 is also double-walled in this example.
  • the inner wall 25 consists of a circumferential, dense component and has a circumferential gap 26 at its lower edge.
  • the gas 15 flowing in between the walls 4 and 25 is directed by a likewise circumferential deflecting strip 27, which is rigidly connected to the parts 4 and 25, in a relatively narrow zone - as shown by arrows 28 - up against the wall 25 guided.
  • the effective range of this arrangement can be set very precisely by the gap width between the wall 25 and the deflection strip 27. With this arrangement, too, it must be ensured that the back of the mold 23 comes to lie as close as possible or even below the upper edge of the deflection strip 27 after the compression.
  • the method according to the invention offers further possibilities which are suitable for a very precise timing of the loosening processes.
  • a corresponding device according to the invention is shown in FIG. 3.
  • the device according to FIG. 3 works with separate compressed air feeds for the compression pressure 18 and the loosening pressure 29.
  • the compressed gas required for loosening the inner mold areas in a localized manner is fed to the ring line 31 via the quick valve 30.
  • This arrangement is characterized by a high adaptability to changing operating conditions.
  • the loosening pressure can thus be applied shortly before the start of pulse compression.
  • the loosening air can Example are taken from the pressure vessel so that both air pressures are identical.
  • the compression pressure rises up to the level of the loosening pressure in the ring line 31, so that the pressure difference in the course of the compression constantly becomes smaller and ultimately zero. In this way, the loosening effect towards the end of the compression can be eliminated, which turns out to be advantageous in certain applications.
  • compressed air pulse compression according to FIG. 3 is designed for an all-round double row of nozzles and additional blowers, which have proven themselves in large sand molds. Additional wind instruments are particularly advantageous when working with several and quite tall models as shown in FIG. 3. Even deep pockets in models which are arranged in central areas of the model plate 1 can be better shaped by means of additional blowing units.
  • the blower 32 is provided in the embodiment proposed here with a deflection device 33, which causes a cylindrical effective area 34 directed upwards.
  • a deflection device 33 which causes a cylindrical effective area 34 directed upwards.
  • other embodiments can also be selected with different knitting geometries and knitting strengths.
  • the optimal design must be adapted to the operating requirements.
  • the blower 32 can, as suggested in the exemplary embodiment in FIG. 3, be connected to the ring line 31 or also have a separate compressed air supply with its own control.
  • the action times of the various loosening devices can be provided in a very short and also staggered manner by using several quick valves.
  • FIG. 3 shows that the main directions of movement 22 of the molding sand during the compaction are influenced by the type and position of the various loosening devices, and thus a thoroughly improved compaction uniformity can be achieved.
  • FIGS. 1 to 3 The devices proposed according to FIGS. 1 to 3 are located in the area of the filling frame and are connected to it. This design has proven to be sufficient for many applications because it has been recognized that the difficulty of compaction is already pre-programmed at the start of compaction and thus particularly in the area of the filling frame. However, it can also prove expedient in individual cases and especially when using high sand molds, to extend the effective range of the loosening devices into the upper part of the mold frame 3.
  • Figure 4 shows that the ring line 31, which carries air pressure, opens into channels 35, 35a, which are directed obliquely upwards.
  • FIG. 5 shows a compressed air distributor, consisting of a cylinder into which the line 32 opens and which is provided with numerous openings 36, 36a and so on on its cylindrical wall.
  • the ring line 31 carries a combustible gas which is passed via the feed lines 40 into the molding material and ignited within the molding material.
  • Appropriate check valves may be available.
  • Figure 7 shows the solution; that there are cylindrical chambers 41, 41a, 41b, etc. distributed over the circumference of the filling frame 4, into which expandable mixtures are introduced. They are either ignited within these cylindrical chambers or passed through the channels 35, 35a into the molding sand and ignited by spark plugs 42, 42a provided on the inner wall of the filling frame. Depending on the type of combustible gas, its supply, concentration and timing of ignition, the loose state of the molding sand located in the vicinity can be determined. In this way, as shown in FIG. 7, pronounced holes 43, 43a can be obtained.
  • the compression with a pressing and / or vibrating device has the advantage in many cases that, because the compression process is a few seconds, the loose state during the compression can accordingly be a few seconds and is accordingly easy to control.
  • Figure 8 shows the solution that the filling frame 4 is double-walled at least in its lower region.
  • the wall 4" has the outer wall 4 'and the inner wall 4 ": the wall 4" is in its lower region
  • Provide channels 35 which are directed downwards and give corresponding downward gas pressure pulses.
  • the lower region of the double-walled filling frame projects into the molding frame 3 in a wedge-like manner, so that after the sand mold has been completed and the filling frame 4 has been removed, the upper region protrudes against the inner wall of the molding frame. wedge-shaped gap remains. This wedge-shaped gap is without disadvantage for the casting mold. It even has the advantage that the resulting gases can be more easily removed from the molding sand during or after casting.
  • passage openings 35a and 35b which promote the pressing of the molding sand by the press ram 37, because in the area of these outlet openings the molding sand particles receive a low packing density due to the expanding gas and are accordingly very flowable .
  • Figure 8 also shows that in the wall of the mold frame 3 passage openings 44, 44a are present, which point downwards and thus give downward gas pressure pulses which are guided into the gap between the models 2 and the inner wall of the mold frame.
  • These gas pulses can be dimensioned so that they greatly improve the sliding properties of the molding sand. However, they can also be dimensioned such that these gas impulses transport the molding sand and at the same time give a pre-compression. Thereafter, in addition to the compactor 37, which acts on the molding sand from above and outside, an additional transport of the molding sand and, at the same time, its pre-compression is achieved in the vicinity of the models at locations that are difficult to reach.
  • FIG. 9 shows in the lower left area that an angled, gas-carrying hollow strip 49 is used at the corners of the molding sand, so that passage openings 48, 48a arranged in the area of the corners can introduce an expanding gas into the molding sand, precisely because of this Corners of the mold frame the molding sand movement is very difficult with previous types of compaction.
  • the angled hollow strip 49 can also be pressed in the indicated double arrow direction 50 onto the mold frame 3 and pulled away from it.
  • Figure 10 shows the solution that the filling frame is also hollow-walled and thus forms a pressure chamber and thus basically has the configuration shown in Figure 8.
  • the inner wall 4 "widens strongly conically in the direction from top to bottom. This ensures that in the compression of the molding sand by the pulse compression transmitter shown during the compression and thus migration of the molding sand from the filling frame into the molding frame in addition to the loosening through
  • the combination of the reduction of the packing density during the compression for the shaping by the expanding molding space and at the same time compressed gas introduced into the molding sand is particularly advantageous.
EP86103822A 1985-03-28 1986-03-20 Procédé et dispositif pour compacter des matériaux de moulage de fonderie Expired - Lifetime EP0197388B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86103822T ATE58659T1 (de) 1985-03-28 1986-03-20 Verfahren und vorrichtung zum verdichten von giessereiformstoffen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3511283 1985-03-28
DE19853511283 DE3511283A1 (de) 1985-03-28 1985-03-28 Verfahren und vorrichtung zum verdichten von giessereiformstoffen

Publications (3)

Publication Number Publication Date
EP0197388A2 true EP0197388A2 (fr) 1986-10-15
EP0197388A3 EP0197388A3 (en) 1987-11-19
EP0197388B1 EP0197388B1 (fr) 1990-11-28

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ID=6266591

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EP86103822A Expired - Lifetime EP0197388B1 (fr) 1985-03-28 1986-03-20 Procédé et dispositif pour compacter des matériaux de moulage de fonderie

Country Status (15)

Country Link
US (1) US4750540A (fr)
EP (1) EP0197388B1 (fr)
JP (1) JPS61226139A (fr)
CN (1) CN86102948A (fr)
AT (1) ATE58659T1 (fr)
AU (1) AU584405B2 (fr)
CA (1) CA1265313A (fr)
DD (1) DD251300A5 (fr)
DE (2) DE3511283A1 (fr)
DK (1) DK143286A (fr)
ES (2) ES8706055A1 (fr)
HU (1) HU203296B (fr)
IN (1) IN163736B (fr)
MX (1) MX165572B (fr)
ZA (1) ZA862271B (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1987007544A1 (fr) * 1986-06-13 1987-12-17 Georg Fischer Aktiengesellschaft Procede et dispositif de compactage de materiaux pulverulents
EP0275963A2 (fr) * 1987-01-20 1988-07-27 Josef Mertes Procédé et dispositif pour compacter un matériau granulaire de moulage comme par exemple le sable de moulage de fonderie
EP0370966A2 (fr) * 1988-11-21 1990-05-30 Stern Giesserei-Anlage Gmbh Dispositif de compactage de sable de moulage dans des châssis à l'aide d'impulsions d'air comprimé
CN104759595A (zh) * 2015-03-31 2015-07-08 青岛意特机械有限公司 微震压实式造型机及其造型方法

Families Citing this family (21)

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Publication number Priority date Publication date Assignee Title
CH671715A5 (en) * 1986-06-13 1989-09-29 Fischer Ag Georg Compacting casting moulds
CH672270A5 (fr) * 1986-12-17 1989-11-15 Fischer Ag Georg
CH675552A5 (fr) * 1988-01-08 1990-10-15 Fischer Ag Georg
DE3836876C2 (de) * 1988-10-29 1994-06-09 Badische Maschf Gmbh Verfahren und Vorrichtung zum Verdichten von Gießerei-Formstoff
DE3839475A1 (de) * 1988-11-23 1990-05-31 Boenisch Dietmar Verfahren und vorrichtung zum impulsverdichten von formsanden
RU1780917C (ru) * 1989-06-29 1992-12-15 Научно-Производственное Объединение Технологии Автомобильной Промышленности Способ изготовлени разовых литейных форм и устройство дл его осуществлени
DE3939001C1 (en) * 1989-11-25 1991-01-31 Georg Fischer Ag, Schaffhausen, Ch Mfr. of casting mould parts, with uniform hardness - uses machine with pattern plate, moulding frame and filling frame
CH682547A5 (de) * 1990-04-20 1993-10-15 Fischer Ag Georg Verfahren und Vorrichtung zum Verdichten von körnigen Formstoffen.
ES2048635B1 (es) * 1991-10-30 1996-07-01 Erana Agustin Arana Cabezal para maquinas de moldeo de cajas de arena por impacto de aire.
DE4208647C2 (de) * 1992-03-18 1995-06-29 Hottinger Adolf Masch Vorrichtung zum Schießen von Gießereikernen oder -formen mit Formstoffen
ES2115480B1 (es) * 1994-11-30 1999-02-16 Erana Agustin Arana Cabezal mejorado para maquinas de moldeo de cjas de arena con impacto de aire.
JP3226151B2 (ja) * 1995-12-15 2001-11-05 新東工業株式会社 ブロースクイズ式鋳型造型機
US5758708A (en) * 1996-10-04 1998-06-02 Ford Global Technologies, Inc. Method of making sand cores
DE102005057724B3 (de) * 2005-12-01 2007-02-01 Laempe & Mössner GmbH Verfahren und Vorrichtung zur Herstellung von Formen oder Kernen insbesondere für Gießereizwecke
JP5076670B2 (ja) * 2006-08-04 2012-11-21 新東工業株式会社 無枠鋳型造型機
US9314941B2 (en) 2007-07-13 2016-04-19 Advanced Ceramics Manufacturing, Llc Aggregate-based mandrels for composite part production and composite part production methods
EP2190933B1 (fr) * 2007-07-13 2019-09-18 Advanced Ceramics Manufacturing, LLC Mandrins a base d'agregats destines a la production de pieces composites et procedes de production de pieces composites
CN109865797A (zh) * 2019-03-14 2019-06-11 刘云峰 一种磁型铸造机
CN110216247B (zh) * 2019-07-17 2021-02-23 晋江鹏发机械有限公司 铸件粘土砂湿法造型工艺
CN111604479B (zh) * 2020-06-04 2021-08-27 山西博鹰铸造有限公司 一种消失模铸造用砂箱结构
CN115770858B (zh) * 2022-11-22 2023-11-03 无锡中叶合金制品有限公司 Ct皮带轮铸造型砂填充装置

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1987007544A1 (fr) * 1986-06-13 1987-12-17 Georg Fischer Aktiengesellschaft Procede et dispositif de compactage de materiaux pulverulents
EP0275963A2 (fr) * 1987-01-20 1988-07-27 Josef Mertes Procédé et dispositif pour compacter un matériau granulaire de moulage comme par exemple le sable de moulage de fonderie
EP0275963A3 (fr) * 1987-01-20 1989-03-15 Josef Mertes Procédé et dispositif pour compacter un matériau granulaire de moulage comme par exemple le sable de moulage de fonderie
EP0370966A2 (fr) * 1988-11-21 1990-05-30 Stern Giesserei-Anlage Gmbh Dispositif de compactage de sable de moulage dans des châssis à l'aide d'impulsions d'air comprimé
EP0370966A3 (fr) * 1988-11-21 1991-01-23 Stern Giesserei-Anlage Gmbh Dispositif de compactage de sable de moulage dans des châssis à l'aide d'impulsions d'air comprimé
CN104759595A (zh) * 2015-03-31 2015-07-08 青岛意特机械有限公司 微震压实式造型机及其造型方法

Also Published As

Publication number Publication date
HUT45423A (en) 1988-07-28
DK143286D0 (da) 1986-03-26
ATE58659T1 (de) 1990-12-15
HU203296B (en) 1991-07-29
DK143286A (da) 1986-09-29
ES553498A0 (es) 1987-06-01
ZA862271B (en) 1986-11-26
EP0197388A3 (en) 1987-11-19
AU5533886A (en) 1986-10-02
DE3511283A1 (de) 1986-10-09
EP0197388B1 (fr) 1990-11-28
JPS61226139A (ja) 1986-10-08
ES8800083A1 (es) 1987-10-16
MX165572B (es) 1992-11-24
US4750540A (en) 1988-06-14
JPH0547307B2 (fr) 1993-07-16
CN86102948A (zh) 1986-09-24
ES557455A0 (es) 1987-10-16
ES8706055A1 (es) 1987-06-01
DD251300A5 (de) 1987-11-11
IN163736B (fr) 1988-11-05
DE3675800D1 (de) 1991-01-10
AU584405B2 (en) 1989-05-25
CA1265313A (fr) 1990-02-06

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