EP0295472A2 - Procédé et dispositif pour le serrage de matière de moulage dans une machine à mouler pour fonderie - Google Patents

Procédé et dispositif pour le serrage de matière de moulage dans une machine à mouler pour fonderie Download PDF

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Publication number
EP0295472A2
EP0295472A2 EP88108468A EP88108468A EP0295472A2 EP 0295472 A2 EP0295472 A2 EP 0295472A2 EP 88108468 A EP88108468 A EP 88108468A EP 88108468 A EP88108468 A EP 88108468A EP 0295472 A2 EP0295472 A2 EP 0295472A2
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EP
European Patent Office
Prior art keywords
compression
pressure
model
press
pressure medium
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
EP88108468A
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German (de)
English (en)
Other versions
EP0295472B1 (fr
EP0295472A3 (en
Inventor
Norbert Damm
Thomas Dr.-Ing. Parr
Ernst Schmitt
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.)
Badische Maschinenfabrik GmbH
BMD Badische Maschinenfabrik Durlach GmbH
Original Assignee
Badische Maschinenfabrik GmbH
BMD Badische Maschinenfabrik Durlach GmbH
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
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Priority claimed from DE19873719846 external-priority patent/DE3719846A1/de
Application filed by Badische Maschinenfabrik GmbH, BMD Badische Maschinenfabrik Durlach GmbH filed Critical Badische Maschinenfabrik GmbH
Publication of EP0295472A2 publication Critical patent/EP0295472A2/fr
Publication of EP0295472A3 publication Critical patent/EP0295472A3/de
Application granted granted Critical
Publication of EP0295472B1 publication Critical patent/EP0295472B1/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
    • B22C15/02—Compacting by pressing devices only
    • B22C15/08—Compacting by pressing devices only involving pneumatic or hydraulic mechanisms

Definitions

  • the invention relates to a method for compacting molding material in the molding box of foundry molding machines with a multi-die press plate, the individual punches of which are arranged at a distance from one another and penetrate into the back of the molding material at different depths according to the model height.
  • the aim is to achieve the same level of strength in the entire molding area.
  • wall friction on box and model surfaces on the one hand large differences in model heights or narrow, deep model contours on the other hand lead to different dimensional strengths. So with large model heights different molded parts are pressed over protruding model surfaces, whereas in narrow and deep model contours as well as at the box edge often weakly compressed molded parts are created.
  • compression In order to achieve a reasonably homogeneous compression of the mold with critical model contours, compression generally has to be carried out in two stages, the compression of the back of the molding material being able to be carried out with a multi-die press plate.
  • the purpose of multi-stamp pressing is to automatically compensate for compression differences caused by the model during the compression process. It is known from DE-OS 29 36 173 to precompact the filled sand in the molding box first by means of a press plate approaching the back of the molding material and then to carry out the post-compaction in a second step by means of press dies stored in the press plate.
  • the press rams are connected to a common pressure medium source and penetrate more or less deeply into the back of the molding material according to the model contour.
  • the object of the present invention is to improve the method described at the outset in such a way that a consistently high compression quality is obtained even with difficult contours.
  • a device is to be specified with which this method can be implemented inexpensively in practice.
  • the described method brings particularly good results if the sum of the punch cross-sections on the sand side is chosen to be 20% to 70%, in particular 20% to 50%, of the molding box area, it being particularly favorable indoors, that is to say above the model to provide more specific stamp area than in the edge area.
  • stamp speeds have hitherto been around 0.2 to 0.7 m / s, stamp speeds above 2.0 m / s are particularly recommended for the present method, particularly 3 to 10 m / s, values of 4 to 8 m / s being particularly preferred are cheap.
  • stamp speeds have hitherto been around 0.2 to 0.7 m / s, stamp speeds above 2.0 m / s are particularly recommended for the present method, particularly 3 to 10 m / s, values of 4 to 8 m / s being particularly preferred are cheap.
  • the dynamic effects in the molding material are similar to those of gas pulse compression.
  • the molding material particles are accelerated to such an extent that when they hit the model or model plate surface, they are compressed to a greater extent than by mechanical slow pressing due to the impact impulse.
  • the pressure plate is expediently also moved towards the molding material at the same lifting speed.
  • the press batten is expediently provided on its edge and in the area between the outer punches with projections on the underside, for example with a circumferential bar that is only interrupted by the outer punches.
  • the edge area of the mold acts as a damping device for the press plate and the individual punches connected to it, and at the same time this edge area experiences a desired additional compression.
  • stamps take place with discretely specified pressures, i.e. that instead of the previously used balancing pressure compensation, a certain support pressure is built up in each stamp, for example, in such a way that the stamps are completely moved out of the press plate before compacting and then are supported according to the model height with different levels of back pressure - especially pneumatically.
  • the press plate is then pressed together with the stamps which move relative to it against the molding material.
  • the stamps can also be set to different levels from the start according to the model profile and then - in particular hydraulic - are supported or fixed so that they essentially maintain their level relative to one another during the subsequent compaction.
  • the method according to the invention is carried out in such a way that at least the pressure medium cylinders for the stamps located within the outer stamp are each connected to a pressure source via their own pressure medium lines and via valves.
  • the individual stamps can either be pneumatically preloaded to a specific support pressure which is selected in accordance with the model contour or the stamps are set hydraulically to different level positions in accordance with the model contour.
  • the pressure medium cylinders of the punches can each be connected to the pressure source via their own switching valves.
  • the pressure medium cylinders can be connected at their one end line by line at their other end in columns to a line or column line pressure medium line, these lines being connected via valves to the supply and discharge lines, respectively and these valves are controlled by a microprocessor in accordance with the desired stroke positions of the punches.
  • the compressed gas pulse can be generated in a manner known per se by compressed air or by explosive gas mixtures.
  • Such a multi-stage compression offers the advantage that the compressed gas flowing through the molding material, on the one hand, brings about fluidization and, on the other hand, pre-compression of the molding material. Both effects improve the compression properties of the mold.
  • the pressure gas pulse can be brought into effect before and / or during pressing.
  • the pressure level and the pressure curve can be as high as, or significantly below, that of pure pulse compression. It is also within the scope of the invention to allow gas to escape from the molding box, in particular via the model plate, or to actively aspirate it during compression.
  • the press head can either be installed in a pressure vessel, which adjoins the filling frame.
  • the press head expediently has a valve plate which interacts with a corresponding valve seat of the pressure container in order to open or shut off the connection of a pressure source which is under pressure to the molding box. So that the gas pulse can communicate to the molding material without large flow losses, it is recommended that the compressed gas not only between the press head and the filling frame, but also through corresponding openings of the press head can flow through it.
  • the press head itself can also be designed as a pressure vessel and connected to a pressure source.
  • a tight connection of the press head to the filling frame must be ensured, for example by means of a sliding seal between the two parts.
  • Figures 1 and 2 first show a model plate 1 with model 2 and a molding box 3 placed on the model plate 1 and a filling frame 4 placed thereon.
  • the loosely poured molding sand is designated by 5.
  • a compression unit 6 in the form of a Veil stamp press head.
  • individual punches 7 are distributed relatively evenly over the cross section of the molding box, expediently have a round cross section and are spaced apart from one another by an amount corresponding to their diameter. They traverse a horizontal press plate 8, which forms the lower end of a box-shaped compression head 9. At least the lower cross section of the compression head 9 is dimensioned so that it fits into the filling frame 4.
  • the outer edge of the press plate 8 is formed by downwardly projecting strips 8a, which at the same time form elongated guide bushes for the external punches.
  • a pressure medium cylinder 10 is arranged within the compression head 9, each of which is connected to a pressure source 12 via a line 11.
  • a lifting table (not shown in the drawing) is provided for raising the molding box against the compression head 9 or, what is more expedient, the compression head 9 can be moved hydraulically into the filling frame 4 which remains at rest via a press cylinder 13 arranged above.
  • the individual pressure medium cylinders 10 are prestressed with different pneumatic pressures, specifically with discrete values that are prescribed as a function of the model contour.
  • the external punches above the model-free space are pre-stressed with 4 bar, the neighboring punches with about 1 bar and the inner punches arranged above the model recess with about 3 bar compressed air.
  • the individual prestressing of the individual cylinders 10 is carried out by a schematically indicated electrical individual control 14, which can be program-controlled depending on the model.
  • the entire compression head 9 is accelerated to a speed of about 7 m / s, the individual punches 7 first penetrating into the back of the molding material.
  • the subsequent press plate 8 By overtaking the subsequent press plate 8, by its spaced arrangement and by its high lifting speed ensures that the prescribed maximum stroke difference ⁇ H / H of at least 30% is set at the end of the compression process.
  • the hydraulic cylinder 13 is again pressurized with oil.
  • the overpressure present in the cylinders 10 automatically ensures that the punches 7 are advanced to the position shown in FIG. 1.
  • Known monitoring units can automatically bring the pressure in individual cylinders 10 back to the prescribed level.
  • Fig. 2 shows an alternative to the pressure supply to the cylinders 10 compared to Fig. 1, in that each cylinder 10 has its own, electrically operated inlet valve 15 and in which all these valves open into a common pressure chamber 16 within the compression head 9.
  • the pressure chamber 16 stands over an on or.
  • Outlet valve 17 with a pressure medium source 12 or with the atmosphere in connection.
  • valves 15 are connected to an electrical selection device 20. It allows to close those valves 15, the cylinders 10 of which have reached the desired preload pressure, during the pressure increase in the pressure chamber 16.
  • the system shown in FIG. 3 is particularly suitable for a hydraulic loading of the cylinders in such a way that the punches 7 are set to different height positions before compression and more or less can be fixed.
  • the individual cylinders as a two-dimensional matrix with a field arrangement of several columns, for example 1, 2, 3 and 4 several rows, for example wise A, B, C and D.
  • the cylinder connections of the columns connected in series are at the upper cylinder end and lie at right angles to the cylinder connections of the rows connected in series at the lower cylinder ends.
  • Each column S and each row R can be hydraulically switched on and off with a two-way valve V1, V2 ...
  • the image of the model height contour is entered into the control program in a model-coded stroke data record and is available for the duration of the model impressions for individual control of the individual stamps.
  • the model-coded stroke data record needs to be changed.
  • each stamp In order to make the stroke adjustment practicable, it is advisable to carry it out in batches using successive, equally large metering levers, i.e. the desired ones To move to the stroke position in certain individual steps. This means that you can no longer move to an infinite number of lifting positions. In practice, however, it is sufficient if each stamp can be gradually adjusted by about two to three centimeters.
  • FIGS. 4 to 7 show molding machines with which the previously described method is carried out in combination with an air pulse acting on the molding material. Depending on its strength, this air pulse causes fluidization, but preferably also pre-compression of the molding material.
  • the entire press head 6 with the compression head 9 and the press cylinder 13 is installed in a pressure container 21.
  • the pressure vessel 21 has a valve seat 22 which interacts with a head plate 23 of the compression head 9, which acts as a valve disk, with the interposition of a seal 22a.
  • the pressure vessel 21 can enter a closed upper chamber 21a, which is connected to a compressed air source 24, and a lower chamber mer 21b, which is in airtight connection with the molding space formed by molding box 3 and filling frame 4, can be divided.
  • the function is as follows: First, the chamber 21a is filled with compressed gas, in particular compressed air, the top plate 23 of the compression head 9 sealing the chamber 21a via appropriate sealing surfaces. Then the hydraulic cylinder 13 is reversed so that the compression head 9 moves down.
  • the chamber 21 opens and the compressed gas in it flows with simultaneous downward movement of the compression head 9 below and reaches both along the outer edge gap between the compression head and the pressure vessel 21 and through gaps between the individual punches 7 and the pressure plate 8 still loose molding material 5.
  • the molding material 5 is fluidized by and when the plunger 7 is immersed there is first the positive effect of a reduction in friction. Furthermore, the compressed gas flowing through the molding material effects a pre-compression in a manner known per se.
  • the final compression takes place in the manner already described by the punches 7 penetrating into the molding material at different depths and finally by the press plate 8.
  • the compressed gas can of course also be supplied outside the compression head 9 in the molding space.
  • the compressed gas can also be moved laterally via valves, not shown be introduced into the lower region of the pressure container 21 above the filling frame 4.
  • Figures 5 to 7 show another design that works with combined compression.
  • the press head 6, that is to say its compression head 9 is itself designed as a pressure vessel.
  • a chamber 9a is formed in the compression head 9, which, on the one hand, is to be pressurized via a compressed gas connection 24 and, on the other hand, can be opened to the molding space via numerous valves 25, only one of which is shown in the drawing.
  • the compression head 9 is provided on the outer edge of the press plate 8 formed by the strips 8a with sealing lips 26 which seal it against the full frame 4.
  • the chamber 9a is connected via connections 27 to the underside of all pressure medium cylinders 10, so that it is not only responsible for the generation of the pressure gas pulse, but also for the lifting of the stamps 7.
  • the pressure medium cylinders 10 are accommodated directly in the chamber 9a, therefore simple cross bores at the lower end of the cylinders 10 are sufficient for the connections 27.
  • Figure 5 shows the beginning of the compression process.
  • the compression head 9 is just so far immersed in the filling frame that the sealing lips 26 seal it against the filling frame 4.
  • the pressure medium cylinders 10 are depressurized from above, whereas the chamber 9a has an overpressure via the external pressure gas source 24 points. This excess pressure is transferred via the connections 27 to the lower displacement of the cylinders 10 and holds all the individual stamps 7 in the upper stroke position shown.
  • FIG. 6 shows the following compression section: Individual cylinders 10 were subjected to discrete counter pressures, preferably gas pressures, on their upper side via their connecting line 11, so that individual punches 7 immersed in the molding material to different depths according to the contour of the model 2.
  • discrete counter pressures preferably gas pressures
  • valves 25 in the chamber 9a were opened, as a result of which the gas under pressure flows into the lower part of the compression head 9, flows around the punches 7 and penetrates into the molding material. This leads to the fluidization already described and the easier penetration of the punches 7 into the molding material surface and to a certain pre-compression of the molding material.
  • exhaust air nozzles 28 can discharge the gas originating from the pressure pulse and the shaped air of the molding material liberated during the subsequent mechanical compression. This air discharge can additionally by active air extraction before and / or during the Compressed are supported by connecting the exhaust air nozzles 28 to a vacuum source.
  • FIG. 7 shows the arrangement after the compression has ended, that is to say after the compression head 9 has been pressed into its lower end position by the hydraulic cylinder 13 in the manner described at the outset, a maximum stroke difference of at least 30% based on the mold box height being maintained between the individual stamps 7 becomes.
  • the fluidization and pre-compression effect by the gas pulse is effective due to the high stamp speeds at least during the main part of the stroke movement of the compression head 9.
  • the duration of action of the gas pulse can be optimally adapted to the other process parameters by corresponding control of the valves 25. It may also be expedient to make the air pulse relatively weak, so that it only leads to fluidization of the molding material without pre-compression.
  • the advantage of the described invention is that the individual control of the individual punches or their different preload in the sense of a high maximum stroke difference between the individual punches results in a much more homogeneous compression than before, even with problematic model contours.
  • the invention also extends to boxless molding, the molding box being stripped or disassembled after compression.
  • the invention is also suitable for combination with other precompression processes.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Devices For Molds (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
EP88108468A 1987-06-13 1988-05-27 Procédé et dispositif pour le serrage de matière de moulage dans une machine à mouler pour fonderie Expired - Lifetime EP0295472B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3719846 1987-06-13
DE19873719846 DE3719846A1 (de) 1987-06-13 1987-06-13 Verfahren und vorrichtung zum verdichten von formstoff in giesserei-formmaschinen
DE19873740185 DE3740185A1 (de) 1987-06-13 1987-11-27 Verfahren und vorrichtung zum verdichten von formstoff in giesserei-formmaschinen
DE3740185 1987-11-27

Publications (3)

Publication Number Publication Date
EP0295472A2 true EP0295472A2 (fr) 1988-12-21
EP0295472A3 EP0295472A3 (en) 1989-06-21
EP0295472B1 EP0295472B1 (fr) 1992-01-15

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ID=25856643

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EP88108468A Expired - Lifetime EP0295472B1 (fr) 1987-06-13 1988-05-27 Procédé et dispositif pour le serrage de matière de moulage dans une machine à mouler pour fonderie

Country Status (5)

Country Link
US (1) US4915159A (fr)
EP (1) EP0295472B1 (fr)
JP (1) JPH0771721B2 (fr)
DE (2) DE3740185A1 (fr)
ES (1) ES2028178T3 (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0715914A1 (fr) * 1994-12-09 1996-06-12 Sintokogio, Ltd. Machine à mouler
WO1996029163A1 (fr) * 1995-03-17 1996-09-26 Künkel-Wagner Prozesstechnologie GmbH Procede pour assurer la qualite de moules en sable par mesure du flux d'huile envoye a la partie superieure d'une presse
WO2001051235A1 (fr) * 2000-01-14 2001-07-19 Sintokogio, Ltd. Procede de moulage et systeme pourvu d'un appareil de moulage
RU2172656C2 (ru) * 1995-06-16 2001-08-27 Синтокогио, Лтд. Устройство и способ изготовления литейных форм
DE19652308B4 (de) * 1995-12-15 2007-03-01 Künkel-Wagner Prozesstechnologie GmbH Dynamische Iterative Stempel-Regelung des Preßvorganges beim Vielstempelpressen
CN104190877A (zh) * 2014-09-22 2014-12-10 江铃汽车股份有限公司 一种型砂紧实装置
WO2016150413A1 (fr) * 2015-03-20 2016-09-29 Montero Gelson G Procédé et dispositif de fabrication d'un moule de fonderie destiné à la coulée en sable
CN117564227A (zh) * 2023-11-22 2024-02-20 当阳市金诚机械制造有限公司 一种铸造砂型造型机

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JP2794476B2 (ja) * 1990-03-30 1998-09-03 新東工業株式会社 分割スクイズフート式の鋳型造型機
ES2048635B1 (es) * 1991-10-30 1996-07-01 Erana Agustin Arana Cabezal para maquinas de moldeo de cajas de arena por impacto de aire.
CH686412A5 (de) * 1992-03-10 1996-03-29 Fischer Georg Giessereianlagen Verfahren zum Verdichten von Formsand fuer Giessformen.
DE4419300C2 (de) * 1994-06-01 1999-05-20 Kuenkel Wagner Prozesstechnolo Verdichtungsverfahren mit abwärts bewegbarer Membran-Preßplatte
USH1769H (en) * 1995-06-06 1999-01-05 The United States Of America As Represented By The Secretary Of The Air Force Optimized recursive foundry tooling fabrication method
US5794681A (en) * 1996-06-07 1998-08-18 Sintokogio, Ltd. Molding machine
EP0849017B1 (fr) * 1996-12-17 2001-10-04 Loramendi, S.A. Machines moulage à impulsion de pression d'air
JPH11333546A (ja) 1998-05-22 1999-12-07 Sintokogio Ltd 砂型加圧用加圧装置
EP1149646B1 (fr) * 1999-11-04 2011-05-18 Sintokogio, Ltd. Dispositif et procede de moulage pour moule en sable
CN1214881C (zh) * 2000-02-17 2005-08-17 新东工业株式会社 充填铸造型砂的装置和方法
WO2001070432A1 (fr) * 2000-03-20 2001-09-27 Georg Fischer Disa A/S Procede et appareil de fabrication de moules en deux parties
JP3407879B2 (ja) * 2000-04-13 2003-05-19 新東工業株式会社 鋳物砂の充填圧縮方法およびその装置
ES2284630T3 (es) * 2000-04-13 2007-11-16 Sintokogio, Ltd. Procedimiento y aparato de compresion para arena de fundicion.
DE10024930A1 (de) * 2000-05-19 2001-11-22 Josef Mertes Verfahren und Vorrichtung zum Verdichten von Formstoffen z. B. Giesserei-Formsand
EP1240957B1 (fr) * 2001-03-16 2007-01-03 Sintokogio, Ltd. Procédé et dispositif de compactage de sable de moulage
JP3729197B2 (ja) * 2001-08-06 2005-12-21 新東工業株式会社 鋳型造型機をモニタする方法及びシステム
JP2008018745A (ja) * 2006-07-10 2008-01-31 Mitsui Eng & Shipbuild Co Ltd 水中清掃ロボット
EP3610966B1 (fr) * 2018-03-27 2023-10-04 Künkel Wagner Germany GmbH Procédé et machine de production d'une partie de moule

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Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0715914A1 (fr) * 1994-12-09 1996-06-12 Sintokogio, Ltd. Machine à mouler
WO1996029163A1 (fr) * 1995-03-17 1996-09-26 Künkel-Wagner Prozesstechnologie GmbH Procede pour assurer la qualite de moules en sable par mesure du flux d'huile envoye a la partie superieure d'une presse
US5980794A (en) * 1995-03-17 1999-11-09 Kuenkel-Wagner Prozess Technologie Gmbh Method of controlling compacting by measuring hydraulic fluid
CN1063113C (zh) * 1995-03-17 2001-03-14 昆克尔－瓦格那工艺技术有限公司 通过测量流到挤压头的油流保证砂型质量的方法
RU2172656C2 (ru) * 1995-06-16 2001-08-27 Синтокогио, Лтд. Устройство и способ изготовления литейных форм
DE19652308B4 (de) * 1995-12-15 2007-03-01 Künkel-Wagner Prozesstechnologie GmbH Dynamische Iterative Stempel-Regelung des Preßvorganges beim Vielstempelpressen
WO2001051235A1 (fr) * 2000-01-14 2001-07-19 Sintokogio, Ltd. Procede de moulage et systeme pourvu d'un appareil de moulage
CN104190877A (zh) * 2014-09-22 2014-12-10 江铃汽车股份有限公司 一种型砂紧实装置
CN104190877B (zh) * 2014-09-22 2016-10-05 江铃汽车股份有限公司 一种型砂紧实装置
WO2016150413A1 (fr) * 2015-03-20 2016-09-29 Montero Gelson G Procédé et dispositif de fabrication d'un moule de fonderie destiné à la coulée en sable
EA034803B1 (ru) * 2015-03-20 2020-03-23 Кюнкель Вагнер Джермани Гмбх Способ и устройство для изготовления песчаной литейной формы
US10603714B2 (en) 2015-03-20 2020-03-31 Kuenkel Wagner Germany Gmbh Method and device for producing a casting mold for sand casting
CN117564227A (zh) * 2023-11-22 2024-02-20 当阳市金诚机械制造有限公司 一种铸造砂型造型机

Also Published As

Publication number Publication date
DE3740185A1 (de) 1989-06-08
EP0295472B1 (fr) 1992-01-15
JPS645642A (en) 1989-01-10
ES2028178T3 (es) 1992-07-01
EP0295472A3 (en) 1989-06-21
JPH0771721B2 (ja) 1995-08-02
DE3867717D1 (de) 1992-02-27
US4915159A (en) 1990-04-10

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