EP0062331A1 - Procédé et dispositif de compactage pneumatique de sable de moulage - Google Patents

Procédé et dispositif de compactage pneumatique de sable de moulage Download PDF

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Publication number
EP0062331A1
EP0062331A1 EP82102841A EP82102841A EP0062331A1 EP 0062331 A1 EP0062331 A1 EP 0062331A1 EP 82102841 A EP82102841 A EP 82102841A EP 82102841 A EP82102841 A EP 82102841A EP 0062331 A1 EP0062331 A1 EP 0062331A1
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EP
European Patent Office
Prior art keywords
molding
space
free
nozzle
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.)
Withdrawn
Application number
EP82102841A
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German (de)
English (en)
Inventor
Alfons Ing. grad. Köbel
Norbert Ing. Grad. Damm
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.)
BMD Badische Maschinenfabrik Durlach GmbH
Original Assignee
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
Application filed by BMD Badische Maschinenfabrik Durlach GmbH filed Critical BMD Badische Maschinenfabrik Durlach GmbH
Publication of EP0062331A1 publication Critical patent/EP0062331A1/fr
Withdrawn legal-status Critical Current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

Definitions

  • the invention relates to methods for the pneumatic compression of the molding sand of foundry molds, which is enclosed in a closed mold space, the boundary of which is formed by a model enveloped by the molding sand, and devices for carrying out these methods.
  • Known pneumatic compression processes mostly work according to the shooting principle.
  • a metered amount of molding sand in the form of a plug is injected or blown into the empty, closed mold space.
  • Injecting the molding sand is particularly common for the actual molds, while the blowing process is used in particular for core molds that do not obtain their final hardness directly through the compression process, but through the addition of appropriate binders.
  • binders are particularly in Higher proportions undesirable because of the difficulties in processing old sand, so that here the compaction is achieved by the shooting process itself and the high pressure used.
  • the injection of the molding sand into the molding space is not produced by compressed air acting on the molding sand plug, but rather by placing the empty molding space under vacuum and then opening it to the filling vessel, so that the molding sand is exposed to the atmospheric pressure acting on it is shot into the mold space.
  • combined processes are known in which the molding space is evacuated with excess pressure before and / or during the injection of the molding sand, but the vacuum primarily serves to remove the excess firing air from the molding space as quickly as possible and thus the formation of air olstern p or prevent air inclusions in the molding sand (eg. for example, DE-OS 27 27 297).
  • the invention has for its object to provide pneumatic compression methods that manage with the least possible effort with a comparatively low energy and air requirements, with a high and uniform mold hardness is to be achieved.
  • This object is achieved according to the invention in a first variant in that the molding space filled with the molding sand is pressurized with air at a pressure gradient of greater than 100 bar / s up to 1000 bar / s.
  • the pressure difference before and after filling the mold space is advantageously between 0.8 and 8 bar.
  • the method according to the invention has the great advantage over known methods. That the molding space is first filled with molding sand using conventional simple means and the compression takes place exclusively by the sudden application of air to the molding space. It is important that the pressure builds up in the range of milliseconds, whereby the existing absolute pressure of up to 8 bar can be easily mastered in terms of design. Practice has shown that it is not, as would be assumed, the highest possible absolute pressure, but only the greatest possible pressure gradient, i.e. the overpressure must be brought into effect in the shortest possible time. In practice, this can be achieved in the simplest way by suddenly connecting the molding space filled with molding sand, which is under normal pressure, to a compressed air reservoir.
  • a second variant for solving the object of the invention is based on a known method for compressing foundry molding material in an evacuable molding space, in which the filled molding material is placed under negative pressure.
  • the solution according to the invention is that compressed air of up to 15 bar is applied as a free jet to the free surface of the molding material.
  • the kinetic energy of the free jet is converted into a compressive force acting on the back of the molding when it hits the free molding material surface, the compressed air penetrating into the molding material being able to relax freely on the one hand because of the prevailing vacuum and on the other hand supporting the pressing action by fluidizing the molding material.
  • the molding space is first filled with the molding material, then evacuated to 0.4 to 0.2 bar and then the compressed air free jet is brought into effect.
  • the evacuation and pressing by means of a compressed air jet take place at different times. It is advantageous if the vacuum is maintained during the free jet pressing and thus a high pressure drop between the back of the mold and the molding surface. This particularly counteracts the risk that pressure bubbles occur when the compressed air penetrates into the molding material.
  • the process can also be carried out in such a way that the mold space is evacuated to 0.4 to 0.2 bar, then filled with the molding material and the compressed air free jet is brought into effect on the free surface of the molding material.
  • the molding material is thus accelerated into the evacuated molding space due to the pressure gradient and pre-compressed when it hits the model and the compressed air free jet is activated when the molding sand falls in or after the filling process has ended.
  • the compressed air free jet has supersonic speed, since an optimal energy conversion is possible above this critical speed.
  • the free surface of the molding material before the application of the compressed air free jet with a substance which increases the flow resistance of the layer near the surface is covered. This allows a further increase in the pressing effect.
  • Liquids such as water, water-binder mixtures or plastic solutions, but also fine dusts, which do not interfere with the processing of the molding material, can be considered as substances.
  • a constructive solution of the first method variant is based on a device with a molding space that receives the molding sand, which is formed by a model, a molding frame surrounding it and a molding space end on the side opposite the model.
  • a device is characterized according to the invention in that the molding space is provided with at least one nozzle opening opening outside the surface of the molding sand and a closure device assigned to it, which allows a pressure build-up of faster than 100 bar / s in the molding space when opened. This pressure gradient can be achieved by appropriate dimensioning of the eye opening (s) and the closure device and its drive.
  • nozzle openings can also be present, it being advantageous if the axis of each nozzle opening is arranged approximately perpendicular to the surface of the molding sand.
  • the nozzle opening is designed as a Laval nozzle, so that a low-loss free jet flow is ensured, which can lie in the supersonic area and, due to the low eddy formation, leads to the formation of an approximately flat back of the mold.
  • each Laval nozzle is arranged and designed so that the free jets generated by it hit approximately the entire surface of the molding sand. This also ensures optimal conversion of the flow energy into compression work over the entire mold cross-section .
  • the mold space in the region of the model is provided with outflow openings for the air, which are optionally also connected to a vacuum. This ensures, especially when the absolute pressure or the amount of air is too high, that it does not impede the compression and can flow away.
  • outflow openings are provided in the base of particularly deep model contours. This ensures that a high and constant form hardness is achieved even in the area of such deep model contours.
  • a device-technical solution of the second method variant is based on a known device with a model plate carrier, an attached molding box, a filling attachment located above and a closure plate, which together form the molding space, and with a filling vessel containing the molding material.
  • a known device is characterized according to the invention by one or more free jet nozzle (s) opening into the molding space and connected to a compressed air source.
  • the cross-section of the mouth of the free jet nozzle (s) and the height of their arrangement above the free molding material surface must be such that the free jet is effective on the entire molding material surface. In order to achieve the speed of sound with such a free jet nozzle in the mouth cross section, it must have an opening angle of 10 to a maximum of 14 ° according to the rules of flow technology.
  • the critical opening angle can only be achieved with very long nozzle lengths.
  • the wall of the free jet nozzle has openings which can be connected to a vacuum.
  • the opening angle of the free jet nozzle can be increased.
  • vortices will then already come off on the wall, preventing critical speeds from being reached.
  • these vortices are suctioned off, so that at least the speed of sound can be achieved despite the larger opening angle in the mouth cross section. Because of the larger opening cross section, it is then ensured that the free jet strikes the entire free molding material surface.
  • the free jet nozzle has a double wall and the space formed by the walls is provided with a vacuum connection.
  • the vacuum connection can lead to the same vacuum source to which the mold space is also connected.
  • the methods according to the invention and the devices proposed for their implementation are suitable for final compaction, in which case static molding and / or stripping of the molding sand can be provided to equalize the back of the mold.
  • the method can also be used for the post-compression of any pre-compressed shapes, be it by shooting, blowing or the like.
  • the method also has the advantage that the compression can take place independently of the direction, i.e. both from above and from below, but also in the horizontal position of the model. It is also possible to compress double-sided models from above and below at the same time.
  • FIGS. 1 to 4 only show a schematic section of conventional molding machines which are provided with devices for filling the mold spaces, for positioning (retracting, pivoting, lifting and locking) the model plate and mold frame and for sealing the mold spaces. For the sake of clarity, these facilities are not shown.
  • the molding space is formed laterally by a molding frame or molding box 1, an attached filling frame 2, on the underside by a model plate 3 with the model 4 and on the top by a closure 5.
  • the end 5 is designed as a plate and with a nozzle opening 6 in shape provided a flat nozzle 7.
  • the plate 5 forms the lower end of a prechamber 8, which is connected to one or more pressure accumulators 10 via a large-sized nozzle 9.
  • a closure device 11 which in the exemplary embodiment shown is designed as a poppet valve 12, which closes the flat nozzle 7 and interacts with the top of the end plate 5.
  • the poppet valve 12 is equipped with a lifting drive 13 arranged outside the prechamber 8.
  • the model plate 3 forms the upper end of an exhaust air chamber 14, into which excess air from the molding space can penetrate through outflow openings 15 in the model plate 3 and can be discharged via an exhaust air connector 16.
  • outflow openings 18 are also provided in deep contours 17 of the model 4 and also open into the outflow chamber 14. If necessary, a vacuum pump can be connected to the exhaust port 16. However, it is also possible to provide further vacuum connections on the molding frame or molding box 1.
  • the prechamber 8 can be pivoted about a vertical axis lying outside the molding space, so that the cross section of the filling frame 2 is free. In this position, the molding sand can then be filled in in an appropriately dimensioned amount until it reaches, for example, the fill level indicated by 19.
  • the molding space is expediently dimensioned such that the free volume 20 above the molding sand surface 19 is as small as possible. Then the Antechamber 8 swung in and locked.
  • valve plate 12 is suddenly raised, so that at least some of the air contained in the compressed air reservoir 10 relaxes via the flat nozzle 7 into the molding space and thereby compresses the molding sand by a combination of dynamic pressure and jet pressure.
  • the cross section of the flat nozzle 7 and the valve plate 12 and its drive 13 are dimensioned such that the pressure build-up in the molding space takes place at greater than 100 bar / s. With appropriate dimensioning, this can be achieved with an absolute operating pressure of up to 8 bar, which is still below the usual compressed air network pressure. Due to the extremely short compression time, which is in the millisecond range, the energy required for compression is very low compared to other known methods.
  • the amount of air required for a mold box with the usual dimensions of 800 x 650 x 300 mm is approximately 1.3 kg or 1.5 Nm 3 per molding process.
  • especially the model contours achieve particularly high compression values, which decrease slightly towards the back of the mold, but are completely sufficient for the further process steps.
  • the level 19 of the molding sand drops to the area of the upper edge of the molding frame or molding box 1.
  • the top layer a few millimeters high, is - apparently due to fluidization effects - formed by loose molding sand that can either be stripped off or leveled out by a pressing process.
  • the exemplary embodiment according to FIG. 2 differs from that according to FIG. 1 essentially only in that two or more Laval nozzles 20 are provided as the nozzle opening 6, the openings of which end approximately flush with the underside of the upper end plate 5.
  • the laval nozzles 20 are in turn assigned a closure device 11 in the form of a poppet valve 22 which closes all existing laval nozzles at the same time.
  • a low-loss and vortex-free conversion of the pressure energy into kinetic energy is possible.
  • the compressed air jet diverges during expansion, so that the molding sand pressing is applied more uniformly.
  • the supersonic speed that can be achieved with a Laval nozzle is also manifested in an increased dynamic pressure when the air jet hits the surface of the molding sand, which leads to even better dimensional stability.
  • the axis of the nozzle openings is approximately perpendicular to the surface of the molding sand.
  • 3 shows an embodiment in which the upper end plate 5 of the molding space has a relatively large opening 23 to the prechamber 8.
  • the nozzle opening 6 is arranged in a side wall 24 of the prechamber 8 and is provided, for example, with a pivotable closure device 11. When the closure device 11 is opened, the compressed air from the reservoir 10 relaxes via the nozzle opening 6 first into the prechamber 8 and only then into the molding space. Even if the jet pressure is not involved in the compression process, satisfactory mold hardness can be achieved.
  • This embodiment facilitates the filling of the molding sand and - if necessary - the re-compacting in a single work station within the molding machine, since the pre-chamber 8 can be designed or moved in a simple manner so that the molding space is freely accessible.
  • FIG. 4 shows an exemplary embodiment in which the exhaust air chamber 14 carries a model 4, 4 'on the top and bottom on a mode plate 3, 3'.
  • the molding frame or molding box 1 and filling frame 2 can for the upper model 4 and the lower model 4 ' be identical.
  • the end plate 5,5 'of both mold spaces is designed in this embodiment so that it is guided on the inner walls of the filling frame 2, that is, it can dip into the mold space. For this purpose, it is provided with a lifting drive, not shown. If necessary, only one end plate 5 or 5 1 needs to be provided with such a drive.
  • the model plates 3, 3 ', the mold frames 1, 1' and the filling frame 2.2 ' can be moved together in relation to the other end plate in the longitudinal axis.
  • two Laval nozzles 20 are arranged in the upper end plate 5 and two Laval nozzles 20 'in the lower end plate 5' corresponding to the design according to FIG.
  • the upper Laval nozzles 20 are each assigned a closure device 11, and the lower Laval nozzles 20 'each have a closure device 11'. These are housed in the prechamber 8 or 8 '.
  • Each prechamber is in turn connected to at least one compressed air reservoir 10, 10 '.
  • the lower end plate 5 While the upper end plate 5 serves primarily for eelizing and / or re-compacting the molding sand, the lower end plate 5 'fulfills yet another task.
  • the molding sand 25 lying on it is raised until it encases or covers the contours of the model 4 'and the free surface of the model plate 3'. Only then does the expansion of the compressed air contained in the store 10 'take place after the closure device has been opened.
  • the molding sand is kept in a state of suspension and, at the same time, is prevented from entering the closure region of the valve when the closure devices 11 'are opened.
  • the molding machine shown in FIGS. 5 and 6 conventionally has a work table 36 which can be raised and lowered by means of a lifting piston 35.
  • a model plate carrier 32 with the model 33 sits on the work table 36.
  • the model plate carrier 32 is designed as a hollow box and can be connected to a vacuum.
  • the plate of the model plate carrier 32 carrying the model 33 is further provided with openings 41 through which air can be sucked out of the molding space.
  • a mold box 31 sits on the model plate carrier 32 and there is a filling attachment 34, which is also provided with a vacuum connection 42.
  • the molding space is finally closed at the top by a closure plate 38, 31 seals 40 being inserted between the latter and the filling attachment and between the latter and the molding box.
  • a spray device 45 for spraying liquids onto the molding material surface 46 is arranged on the closure plate 38. Furthermore, a free jet nozzle 44 which opens into the molding space and is connected to a compressed air source via a valve 43 is located on the closure plate 38.
  • the closure plate 38 with spray device 45 and free jet nozzle 44 sits together with a filling vessel 37 containing the molding material on a carriage which can be moved over the molding space, so that either the filling vessel or the closure plate 38 is placed on the filling attachment 34.
  • the device operates as follows:
  • the filling vessel 37 is located on the filling attachment 34.
  • the metered amount of molding material contained therein is dispensed by opening a flap or blind closure on the bottom of the filling vessel 37 into the molding space delimited by the model plate carrier 32, the molding box 31 and the filling attachment 34.
  • the carriage is moved so that the closure plate 38 with spray device 45 and nozzle 44 passes over the filling set 34.
  • the reciprocating piston 35 is actuated so that the entire molding space is raised and the closure plate 38 is pressed against fixed stops 39. In this position, the molding space is sealed, which is then evacuated via the connections 42 in the filling set 34 and in the model plate carrier 32. In this way, the pore air is sucked out of the molding material filling.
  • liquid is sprayed onto the molding material surface by means of the spray device 44 and the valve 43 is immediately opened so that the compressed air impinges on the molding material surface 46 in the form of a free jet and the kinetic energy the beam is converted into pressing force.
  • the free jet nozzle 44 has a double jacket, its inner wall being provided with openings, for example a perforation, while the outer wall has a vacuum connection 49.
  • the double jacket can be connected to the vacuum source provided for evacuating the molding space via this connection.
  • a press head 47 with a press plate 48 for compressing the molding material sits on the filling vessel 37 and the closure plate 38 with the nozzle 44 and the carriage, which is not shown in FIG. 6.
  • the mode of operation corresponds to that already described for FIG. 5.
  • the work table 36 is lowered, the closing plate 38 with the nozzle 44 is moved to the right and at the same time the press head 47 is retracted until it is above the lowered filling attachment 34.
  • the work table 35 is raised again, so that the press plate 48 comes into effect on the free molding surface 46.
  • the molding is carried out in the usual way.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Devices For Molds (AREA)
EP82102841A 1981-04-02 1982-04-02 Procédé et dispositif de compactage pneumatique de sable de moulage Withdrawn EP0062331A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3113297 1981-04-02
DE3113297 1981-04-02
DE3115731 1981-04-18
DE3115731 1981-04-18

Publications (1)

Publication Number Publication Date
EP0062331A1 true EP0062331A1 (fr) 1982-10-13

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EP82102841A Withdrawn EP0062331A1 (fr) 1981-04-02 1982-04-02 Procédé et dispositif de compactage pneumatique de sable de moulage

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EP (1) EP0062331A1 (fr)
JP (1) JPS58500474A (fr)
WO (1) WO1982003348A1 (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1983002078A1 (fr) * 1981-12-11 1983-06-23 Landolt, Christoph Procede de fabrication de moulages a l'aide de sable de moulage ou d'un autre melange a base de particules de matiere premiere
EP0106220A2 (fr) * 1982-10-15 1984-04-25 Georg Fischer Aktiengesellschaft Installation pour conduire d'une manière contrôlable des milieux gazeux
EP0128336A1 (fr) * 1983-05-11 1984-12-19 BMD Badische Maschinenfabrik Durlach GmbH Dispositif pour le serrage de sable de fonderie
GB2163686A (en) * 1984-06-21 1986-03-05 Doyle Ltd C F Pressurised gas compaction of foundry mould material
EP0199156A2 (fr) * 1985-04-20 1986-10-29 BMD Badische Maschinenfabrik Durlach GmbH Procédé de fabrication de moules de fonderie par compactage d'un matériau de moulage granulaire
EP0203322A1 (fr) * 1985-05-25 1986-12-03 BMD Badische Maschinenfabrik Durlach GmbH Dispositif pour compacter un matériau de moulage de fonderie à l'aide d'un gaz de compression
GB2199523A (en) * 1986-11-25 1988-07-13 Doyle Ltd C F Compacting a moulding mixture by a pressurised gas wave
US10993849B2 (en) 2010-09-16 2021-05-04 Dsg Technology Holdings Ltd. Article with chassis having an elastic distribution, absorbent core and system and method for making same

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3344520A1 (de) * 1983-12-09 1985-06-20 BMD Badische Maschinenfabrik Durlach GmbH, 7500 Karlsruhe Vorrichtung zum verdichten von giesserei-formstoff mittels druckgas
FR2591133B1 (fr) * 1985-12-05 1988-07-29 Audant Bernard Procede et machine de fabrication d'un demi-moule de fonderie par moulage en sable a vert.
JPS63503446A (ja) * 1986-06-13 1988-12-15 ゲオルク・フィッシャー・アクチエンゲゼルシャフト 粒状成形材料の圧密方法及び装置
CN1099927C (zh) * 1995-09-08 2003-01-29 新东工业株式会社 造型装置
JP2001504394A (ja) * 1996-10-14 2001-04-03 ブルーズレーネ グラム インヴェスト エー／エス 砂型を製造するための方法と装置
CN111467722B (zh) * 2020-05-21 2023-07-04 南京湛泸科技有限公司 一种消防喷砂炮管及其型面的设计方法

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2847736A (en) * 1954-12-31 1958-08-19 Pulvermacher Dietrich Device for making sand molds for metal casting
US3659642A (en) * 1969-12-05 1972-05-02 Lev Fedorovich Vasilkovsky Apparatus for compacting a moulding mixture
FR2141235A5 (fr) * 1971-06-08 1973-01-19 Dynamit Nobel Ag
DE2249244A1 (de) * 1972-10-07 1974-04-11 Buderus Eisenwerk Verfahren zum gleichzeitigen verdichten und aushaerten von haertbaren formstoffen
WO1980001544A1 (fr) * 1979-02-02 1980-08-07 Fischer Ag Georg Procede pour rendre compact un moule en sable
EP0017131A1 (fr) * 1979-04-04 1980-10-15 Georg Fischer Aktiengesellschaft Procédé et installation pour compacter un matériau de moulage
JPS55133847A (en) * 1979-04-05 1980-10-18 Sintokogio Ltd Molding method of mold and device thereof
JPS55147462A (en) * 1979-05-08 1980-11-17 Sintokogio Ltd Molding method of lower mold and squeeze plate device

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2847736A (en) * 1954-12-31 1958-08-19 Pulvermacher Dietrich Device for making sand molds for metal casting
US3659642A (en) * 1969-12-05 1972-05-02 Lev Fedorovich Vasilkovsky Apparatus for compacting a moulding mixture
FR2141235A5 (fr) * 1971-06-08 1973-01-19 Dynamit Nobel Ag
DE2249244A1 (de) * 1972-10-07 1974-04-11 Buderus Eisenwerk Verfahren zum gleichzeitigen verdichten und aushaerten von haertbaren formstoffen
WO1980001544A1 (fr) * 1979-02-02 1980-08-07 Fischer Ag Georg Procede pour rendre compact un moule en sable
EP0017131A1 (fr) * 1979-04-04 1980-10-15 Georg Fischer Aktiengesellschaft Procédé et installation pour compacter un matériau de moulage
JPS55133847A (en) * 1979-04-05 1980-10-18 Sintokogio Ltd Molding method of mold and device thereof
JPS55147462A (en) * 1979-05-08 1980-11-17 Sintokogio Ltd Molding method of lower mold and squeeze plate device

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1983002078A1 (fr) * 1981-12-11 1983-06-23 Landolt, Christoph Procede de fabrication de moulages a l'aide de sable de moulage ou d'un autre melange a base de particules de matiere premiere
EP0106220A2 (fr) * 1982-10-15 1984-04-25 Georg Fischer Aktiengesellschaft Installation pour conduire d'une manière contrôlable des milieux gazeux
EP0106220A3 (fr) * 1982-10-15 1985-05-15 Georg Fischer Aktiengesellschaft Installation pour conduire d'une manière contrôlable des milieux gazeux
EP0128336A1 (fr) * 1983-05-11 1984-12-19 BMD Badische Maschinenfabrik Durlach GmbH Dispositif pour le serrage de sable de fonderie
GB2163686A (en) * 1984-06-21 1986-03-05 Doyle Ltd C F Pressurised gas compaction of foundry mould material
EP0199156A2 (fr) * 1985-04-20 1986-10-29 BMD Badische Maschinenfabrik Durlach GmbH Procédé de fabrication de moules de fonderie par compactage d'un matériau de moulage granulaire
EP0199156A3 (fr) * 1985-04-20 1987-11-25 BMD Badische Maschinenfabrik Durlach GmbH Procédé de fabrication de moules de fonderie par compactage d'un matériau de moulage granulaire
EP0203322A1 (fr) * 1985-05-25 1986-12-03 BMD Badische Maschinenfabrik Durlach GmbH Dispositif pour compacter un matériau de moulage de fonderie à l'aide d'un gaz de compression
GB2199523A (en) * 1986-11-25 1988-07-13 Doyle Ltd C F Compacting a moulding mixture by a pressurised gas wave
US10993849B2 (en) 2010-09-16 2021-05-04 Dsg Technology Holdings Ltd. Article with chassis having an elastic distribution, absorbent core and system and method for making same

Also Published As

Publication number Publication date
JPS58500474A (ja) 1983-03-31
WO1982003348A1 (fr) 1982-10-14

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