EP0084627A1 - Dispositif pour comprimer du matériel de moulage pour fonderies - Google Patents

Dispositif pour comprimer du matériel de moulage pour fonderies Download PDF

Info

Publication number
EP0084627A1
EP0084627A1 EP82110996A EP82110996A EP0084627A1 EP 0084627 A1 EP0084627 A1 EP 0084627A1 EP 82110996 A EP82110996 A EP 82110996A EP 82110996 A EP82110996 A EP 82110996A EP 0084627 A1 EP0084627 A1 EP 0084627A1
Authority
EP
European Patent Office
Prior art keywords
opening
pressure
pressure vessel
membrane
valve
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
EP82110996A
Other languages
German (de)
English (en)
Other versions
EP0084627B1 (fr
Inventor
Alfons Ing. grad. Köbel
Werner Geiger
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.)
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=25798338&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0084627(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Badische Maschinenfabrik GmbH, BMD Badische Maschinenfabrik Durlach GmbH filed Critical Badische Maschinenfabrik GmbH
Publication of EP0084627A1 publication Critical patent/EP0084627A1/fr
Application granted granted Critical
Publication of EP0084627B1 publication Critical patent/EP0084627B1/fr
Expired legal-status Critical Current

Links

Images

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 a method for compressing foundry molding material, which is loosely heaped on a model in a closed molding space, by means of compressed gas acting on the molding material surface, which emerges from a pre-pressure chamber at high pressure via a closable opening between the latter and the molding space in the latter is relaxed.
  • a large number of mechanical, pneumatic and combined compression methods are known for the compression of foundry molding material, only the pneumatic methods being of interest in connection with the invention. These can essentially be divided into two categories. In the first category, the The molding material is placed under gas pressure in an antechamber and blown or injected into the molding space together with the air after opening a valve. In any case, this process requires mechanical re-pressing of the molding material in the molding box with significant press forces (e.g. DE-AS 28 44 464). In the other category, the molding material is poured onto the model loosely and then pressurized with compressed air from the back of the mold (e.g. DE-AS 28 44 464, DE-AS 1 961 234).
  • the first variant (DE-AS 28 44 464)
  • compressed air up to 7 bar is blown in once or more times over a period of time between 0.2 and 1s via openings in a hollow end plate of the molding space, the air flowing through the molding sand over Openings in the model plate should flow out.
  • Mechanical repressing is also necessary here, on the one hand to compress the back of the mold, and on the other hand to squeeze out the residual air that is still present in the molding material due to the fluidization effect, the squeezing also being to be supported by a vacuum. This process does not achieve a noticeable reduction in design effort compared to the shooting and blowing processes.
  • a molding machine is described (DE-AS 1 961 234), in which a pressure vessel forming the antechamber is arranged above the closed molding box or a filling frame arranged above it, which can be connected to the molding space via a mechanically moved valve.
  • a pre-pressure of 100 bar is proposed for mold boxes of customary size in order to achieve a satisfactory compression there after relaxation in the mold space.
  • Such a high pressure easily leads to irregularities in the surface of the molding material when the compressed gas impinges on the back of the mold, as well as to a considerable design effort in order to generate such high pressures and to achieve the necessary compressive strength in the molding space.
  • the state of the art therefore still provides that / via distributor plates is brought into effect evenly over the back of the mold and, moreover, the pressurized gas is to flow out through a large number of openings in the model plate. These openings in turn represent a constant source of interference when they are added by the molding material.
  • the object of the invention is to propose a compression method which, on the one hand, does not require mechanical re-pressing, and on the other hand enables a uniform and sufficiently high compression with a regular molding material surface.
  • This object is achieved in that the pressurized gas is released into the mold space up to a pressure of maximum 8 bar with a gas mass throughput of more than 50 kg / s and with a temporal pressure increase in the mold space of more than 300 bar / s. Since the pressure increase in the molding space from 1 bar to the maximum pressure initially increases slowly and then very steeply and depends on the pneumatic conditions, the above-mentioned size of more than 300 bar / s results in a measurement from 1.5 bar in the molding space.
  • the occurrence of irregularities on the surface of the molding material is avoided according to the invention in that the pressure rise in the molding space does not exceed the limit of 8 bar. It is of decisive importance for the compression effect that the temporal pressure increase in the mold space is more than 300 bar / s, while the gradient for the pressure drop in the pre-pressure space is irrelevant. Practical tests have shown that the combination of these procedural Measures a perfect compression of the molding material can be achieved both over the cross section of the molding space and over the depth of the molding space with a uniform molding surface. Outflow openings for the compressed gas in the modett plate are not necessary or only necessary in deep model contours. The effect of the method according to the invention is therefore not or only to a small extent in fluidization, but appears to be due to a type of piston action of the compressed gas and to dynamic pressure effects within the molding material.
  • the method according to the invention opens up the possibility that the pressure in the upstream pressure chamber is a maximum of 20 bar. This pressure can still be reacted with relatively little effort in terms of mechanical engineering, while the pressure of up to 100 bar provided in the prior art requires an effort which makes this known process economically completely uninteresting.
  • the invention is based on a known device (DE-AS 1 961 234), which consists of a pressure vessel forming the pre-pressure chamber, a mold box with filling frame arranged underneath it, forming the mold space, and a model plate with the model and a bottom representing the bottom thereof there is valve arranged between the pressure vessel and the molding box.
  • the valve of the known device is a poppet valve which has a combined pneumatic-mechanical auxiliary drive and closes an opening of a relatively small cross-section between the pressure vessel and the molding box.
  • the valve opening there is a distributor cone and above it a perforated floor that extends over the entire mold area or, in another variant, an adjustable slot floor (DE-OS 2 151 949).
  • a perforated floor that extends over the entire mold area or, in another variant, an adjustable slot floor (DE-OS 2 151 949).
  • the pressure gradient of more than 300 bar / s in the molding space required according to the invention cannot be achieved.
  • the pressure increase is achieved in that the opening cross section of the valve is between 50 and 150% of the horizontal cross section of the molding box.
  • the valve advantageously has a closure member that releases the opening cross section in a few milliseconds, for example in about 10 ms.
  • the pressure vessel has an opening approximately corresponding to the outline of the molding box, against the edge of which the molding box can be pressed in a sealing manner with the filling frame and with which the closure member cooperates.
  • the valve has an elastically deformable closure member, which releases the required opening cross section primarily under the effect of the pressure in the pressure vessel.
  • elastically deformable closure members have the advantage of a low mass and can therefore be accelerated quickly.
  • the holding force for such an elastic closure member can be applied in various ways, for example by inherent stability, by control air or the like.
  • the elastic closure member can be a membrane which, in the closed position, lies sealingly against the edge of the opening in the pressure vessel. The entire free cross section of the opening is accordingly closed by the membrane.
  • a tried and tested embodiment is characterized in that the membrane is clamped on the edge above the opening and inside the pressure vessel to form an annular flow cross-section for the compressed gas and in the closed position under the effect of control air acting on its inside while shutting off the flow cross-section and plant on Opening edge of the pressure vessel is bulged like a balloon.
  • the flow cross-section between the edge-side clamping of the membrane and the opening of the pressure vessel should be equal to or larger than the free cross-section of the opening, so that a rapid overflow of the compressed gas is possible.
  • the control air is only used for balloon-like inflation of the membrane and is blown off for the purpose of releasing the flow cross-section, for example by opening only one blow-off valve in the control air circuit.
  • the pressure of the compressed gas acting on the membrane in the area of the flow cross section forces the membrane out of the area of the flow cross section in the shortest possible time.
  • the space on the inside of the membrane is expediently connected to a control air line, which is connected by means of a hose pinch valve is closable.
  • This pinch valve can have a cross-sectional area that allows the control air to be blown off quickly and easily.
  • the closure member consists of a plurality of elastic membranes arranged parallel to one another and parallel to the axis of the opening, of which two each delimit a part of the opening cross section and can be brought into the shooting days in which they abut one another by means of compressed air.
  • This closure element works similarly to several pinch valves arranged side by side,
  • the membrane is designed as a tear membrane and clamped between the molding box and the pressure vessel. It is designed in such a way that it is either opened arbitrarily or involuntarily when the pressure in the pressure vessel rises when the desired pre-pressure is reached.
  • the tear membrane is weakened for the purpose of opening the opening in defined areas which are arranged such that when the membrane is torn open under the action of the compressed gas, the membrane is retained as a coherent part. In particular, this prevents parts of the membrane from being thrown onto the surface of the molding material when tearing open, thereby either disrupting the compression process at this point or disrupting further processes to which the mold is subjected after compression.
  • the tear membrane in the area of the opening of the pressure vessel is supported by a grid with a large grid dimension. It will be released before the opening in the area of each grid opening weakened or separated on only three sides.
  • the grating on the one hand prevents the membrane from bulging too much in the mold space and the resultant excessive stress, and on the other hand the grille gives the possibility of weakening or separating the tear membrane only at defined points, so that the membrane also tears open is present in a coherent part and can be removed from the area of the opening without residue after the work cycle.
  • a cutting device is arranged above the tear membrane, the cutting tools of which are arranged in the grid of the grid such that, for example, only three sides of each grid opening are assigned a cutting tool.
  • the cutting tools can be arranged on a lattice frame movably guided in the pressure vessel, which does not or not appreciably impedes the flow of the compressed gas.
  • the cutting device, the cutting tools of which act as a base against the individual lattice bars, has the advantage that a defined sectional view is obtained, that is, the membrane is always torn open at the same points by the action of the compressed gas.
  • the bars forming the grid have heating conductors on their upper side, these being arranged, for example, on three sides of each grid opening and being switchable to release the opening of the pressure vessel.
  • a crosswise arrangement of the cutting tools or the heating conductor can also be provided, as long as only the torn open membrane is retained as a coherent part.
  • the material of the membrane is caused to melt or flow by the action of heat, so that there is no complete cut, but only a weakening of the membrane on the corresponding lattice bars.
  • the membrane is then torn open by the compressed gas at these weakening points and the full cross section is released.
  • heating conductors are embedded in the tear membrane, which can be switched on to release the opening of the pressure vessel. These heating conductors are also arranged so that the membrane is retained in coherent parts.
  • the tear membrane is part of an elastic endless web which can be pulled off a supply spool on one side of the molding box in the working cycle of the device by means of a reel arranged on the other side of the molding box. After each work cycle and opening of the valve, a new section of the continuous web is drawn over the molding space and then clamped between the mold box and the filling frame by moving to the mold box or filling frame.
  • the closure member is a hose arranged coaxially with the opening, the cross section of which is adapted or adaptable to the cross section of the opening of the pressure container, which is clamped at one end thereof at a distance above the opening of the pressure container and which projects into this opening with its other end and can be pressed against the opening edge by means of a closing mechanism acting on its peripheral edge.
  • the hose is accordingly spanned as a cylindrical structure within the pressure vessel and closes the opening of the pressure vessel at its periphery.
  • the closing mechanism which can act on the hose from the inside or outside, the hose collapses inwards and releases the flow cross-section previously closed by it to the opening of the pressure container.
  • plastics or rubber provided with reinforcing inserts are considered as materials, which are nevertheless sufficiently flexible. The flexibility is supported by the extensive training.
  • a sealing seat which widens towards the molding box is arranged at the opening edge and the closing mechanism has a clamping ring which can be raised against it and clamps the end of the hose between itself and the sealing seat.
  • This clamping ring leaves a sufficiently free passage cross section for the compressed gas and only needs to be lowered in the millimeter range in order to give the hose the opportunity to collapse.
  • a stroke drive arranged in the pressure container can be provided as the drive for the clamping ring.
  • a scraper ring is arranged above and inside the hose, which can be lowered into the area of the sealing seat after each opening of the opening.
  • the clamping ring is lifted back into its position which grips the end of the hose and presses against the sealing seat.
  • the closure member is a bellows which is fastened at one end in the pressure vessel, locked at its other end above the opening edge and closed at this end.
  • the bellows acts as a piston due to its frontal closure. By arranging its one end above the opening edge, the compressed gas can come into effect on the bellows at this end, so that after releasing the locking of the bellows by means of the compressed gas is suddenly raised or compressed, the compressed gas acting on the entire piston surface.
  • Such bellows can be made from thin-walled sheet metal or from flexible materials and are extremely durable. They are therefore particularly suitable for the purpose according to the invention.
  • the opening movement is preferably supported in that the bellows is under tension in the closed position so that it contracts at the moment of unlocking and the compressed gas can quickly come into effect as a further accelerating force.
  • the bellows can have a flange at its end facing the opening, on which a locking device engages on the outside, the bellows being closed at this end by a membrane.
  • a membrane has the advantage of a relatively low mass, which is favorable in terms of high acceleration.
  • a lifting drive can be provided which, after the locking device engages, returns to its starting position, thus not influencing the opening movement of the valve.
  • the bellows is connected to the inside of the atmosphere. This enables a resistance-free compression of the bellows during the opening process.
  • support tubes can be provided within the bellows, one of which is connected to the end facing the opening, that is to say is taken along with the movement of the bellows.
  • a hose can also be provided, which is arranged, fastened, pretensioned, locked and accelerated in the same way.
  • Devices of this type have a central molding material filling shaft which can be locked by means of a slide or the like with respect to the molding box or filling frame located underneath.
  • the valve has an annular opening surrounding the filling shaft, which creates the connection between the pressure vessel and a space arranged between the slide and the filling frame, on the inner wall of which a corresponding annular sealing seat is arranged and on the outer wall of which is arranged a ring bellows or ring hose that can be pressed against the sealing seat.
  • the pressure gas is not released directly from the pressure vessel through the opening onto the free molding material surface, but via the ring opening into the space above the molding space.
  • the requirement that the free cross-section of the ring opening 50 to 150% of the free corresponds to the horizontal cross-sectional area of the molding space.
  • the advantage of this device is that the molding material can be filled in centrally. The valve closure and its acceleration can also easily take place within the required limit data, since, due to the large diameter of the ring opening, a relatively small stroke of the closure member is sufficient.
  • the closure member is either designed as a bellows, which is acted upon on the outside with control compressed air and bulges inwards until it rests on the sealing seat, or as a hose, which then inflates with one half into the ring opening.
  • a blow-off valve in the control air circuit is opened, so that the annular bellows or the hose are pushed back under the action of the compressed gas and release the ring opening.
  • the pressure vessel expediently surrounds the filling shaft in an annular manner and opens out into the annular opening of the valve via an annular opening.
  • a mold box 2 sits on a model plate 1 with the model (not shown) and a filling frame 3 on this. These parts form the mold space. Above the molding space there is a pressure vessel 4 for receiving of compressed gas up to 20 bar, which is fed via a nozzle 5 from a pressure accumulator or - at low admission pressure - from the compressed air network.
  • the pressure vessel has an opening which is arranged centrally in the exemplary embodiment according to FIG. 1 and whose inside width corresponds approximately to the free horizontal cross section of the filling frame 3. Attached to the pressure vessel 4 is an extension 38 which extends the opening 6 downwards and against which the unit consisting of the model plate 1, molding box 2 and feeding frame 3 can be pressed from below.
  • the opening edge 7 of the opening 6 forms a sealing seat for a valve denoted overall by 8, which has an elastic closure member 9.
  • the elastic closure member 9 is designed as a membrane 10, which is inflatable like a balion and, when inflated, lies tightly against the opening edge 7 in the pressure vessel 4.
  • a plurality of support strips 11 are arranged within the extension 38, against which the membrane 10 bears in the inflated state.
  • the membrane 10 is clamped with its edge 12 at a distance above the bottom of the pressure vessel 4.
  • a ring 13 supported on the ground and a plate 14 are used, which are clamped together by means of screws while clamping the edge 12 of the membrane 10.
  • the plate 14 is held by a centrally arranged tube 15, which in turn is fastened in the lid 16 of the pressure vessel 4.
  • This tube establishes the connection between the inside of the membrane 10 and a compressed gas source, not shown, which supplies the control air for closing the valve 8.
  • a pinch valve 17 is arranged, which are closed or vented via a three-way valve 18 can.
  • a fitting with soft transitions is arranged, against which the membrane 10 can bear.
  • the membrane 10 bulges outward and lies sealingly against the opening edge 7.
  • the pressure vessel 4 is filled with compressed gas up to 20 bar.
  • the molding unit consisting of molding box and filling frame is pressed against the lower edge of the attachment 38 on the pressure vessel 4.
  • the hose pinch valve 17 is closed at the latest during the filling process of the pressure container 4.
  • the hose pinch valve 17 opens automatically under the effect of the pressure prevailing in the tube 15, so that the compressed gas in the pressure vessel 4 suddenly pushes back the membrane 10 via the annular flow cross-section 19 between the ring 13 and the bottom of the pressure vessel , so that it bears against the contour of the fitting at the lower end of the tube 15.
  • the compressed gas can then relax through the opening 6 into the molding space and have a compressing effect on the molding material surface.
  • the compression effect is based on a combined piston-like pressurization and a fluidization process with dynamic pressure development.
  • the opening times of the membrane 10 are in the millisecond range, provided only the cross section of the tube 15 and the pinch valve 17 is large enough to suddenly blow off the locking air. Likewise, the outflow cross section for the control air of the pinch valve must be correspondingly large. With this construction, a pressure gradient of greater than 300 bar / s can be achieved within the molding space.
  • FIG. 2 shows an embodiment in which above the molding space consisting of molding box 2 and filling frame 3, a filling shaft 20 with a filling funnel 21 for the molding material is located in its axis
  • the filling shaft 20 can be closed relative to the molding space by means of a slide 52 or the like.
  • a housing extension 38 Arranged between the slide 52 and the filling frame 3 is a housing extension 38 which is enlarged in the axial direction.
  • the pressure vessel 4 is ring-shaped in this exemplary embodiment and surrounds the central shaft 20 which passes through it.
  • the pressure vessel 4 has an annular opening 22 which is concentric with the filling shaft 20 and which creates the connection to an annular opening 23 in the region of the boar 52.
  • This ring opening 23 surrounds the filling shaft 20 or the extension 3B only on part of its circumference, which, however, should be as large as possible. For example, the ring opening 23 is only missing on the side on which the slide 52 is extended.
  • the ring opening 23 opens into the extension 38 via a conical section 24.
  • valve 8 has an annular bellows 25 which delimits a control air channel 26 to the ring opening 23.
  • a sealing seat 27 which surrounds the filling shaft 20 and which cooperates with the closure member in the form of the annular bellows 25.
  • FIG. 3 shows another embodiment in which the section of a pressure-resistant hose 28 is clamped in the axial direction within the container 4.
  • One end is clamped between a ring 29 and the flange 30 of a support tube 31, while its lower end hangs into the opening 6 of the pressure vessel 4.
  • an annular sealing seat 32 is attached, which widens conically downwards.
  • a clamping ring 33 is arranged inside the hose 28 and can be raised and lowered by means of a lifting drive 34. In the lowered position, the hose 28 can hang into the opening 6. When the clamping ring 33 is raised, the hose is then clamped between it and the sealing seat 32.
  • the clamping ring 33 is slightly lowered.
  • the pressure gas contained in the pressure vessel 4 then compresses the hose 28 inwards and the pressure gas can suddenly escape into the mold space 2, 3 via the clamping ring 33.
  • a scraper ring 53 is provided, which is arranged concentrically within the hose 28 and is lowered after relaxation, so that the hose 28 is pushed outwards again and with its lower end in the opening 6 protrudes. Then the clamping ring 33 is raised again so that the hose 28 can be clamped again.
  • FIGS. 4 and 5 show an exemplary embodiment in which the closure member 9 is formed from a tear tube 35, ie is destroyed during the opening process.
  • This tear membrane 35 is part of an endless belt 36, which is wound on one side of the molding space formed from the filling frame 3 and the molding box 2 on a supply reel 37 and is pulled off by a reel 39 by one membrane length in each working cycle.
  • the endless web 36 moves between an attachment 40 on the filling frame 3 and a sealing ring 41 in the area of the opening 6 of the pressure vessel 4. The gap is sealed against the endless web when the molding box 2 is raised by pressing the attachment 40.
  • a grating 42 is arranged within the attachment 40, the grating bars 43 of the membrane resting on the top side. As can be seen from Figure 5, the grid 42 has a wide grid dimension.
  • a cutting device 44 is arranged inside the pressure vessel 4, which consists of a grid frame 45 which serves as a carrier for a plurality of cutting tools 46.
  • the cutting tools 46 are arranged in such a grid that they weaken or split the tear membrane 35 on three sides of a grid opening. These dividing lines are designated by 47 in FIG. 5 and drawn out a little more strongly.
  • such a cutting tool is missing on each side 48 of each grid opening, so that the parts of the membrane corresponding to the grid grid remain there as continuous tabs on the endless web 36.
  • FIG. 5 there is no separation of the membrane in the area of the lattice bars 43, so that the webs of material remaining there had the resulting flaps in connection with the endless web 36.
  • the lattice girder 45 of the cutting device 44 is guided on rods 49 within the bridge container 4 and can be raised and lowered by means of a pusher drive 50, so that the cutting knives can be lowered onto the tear membrane 9 from the rest position shown in FIG.
  • the cutting tools can also be provided to embed heating conductors on the upper side 51 of the bars 43 in accordance with the grid of the cutting tools 46. Since the tear membrane 35 lies tightly under the action of the compressed gas on the upper side of the bars 43, heat is transferred rapidly, so that the elastic membrane at the locations of the heating conductors is quickly weakened by melting, evaporation or burning of the material and tears open according to the sectional view of Figure 5.
  • the heating conductors can in particular be designed as PTC elements, the limit temperature of which is only slightly above the melting temperature of the tear membrane, so that a thermally self-regulating device of robust construction is provided. In both embodiments, deviating from the described arrangement of the cutting tools or the heating conductor, a crosswise arrangement can also be provided, only sufficiently wide material webs having to be retained in all directions between the individual arrangements.
  • the heating conductors can also be embedded within the endless web 36, it being possible for the current to be supplied via the supply reel 37 or the winding reel 39.
  • FIG. 6 shows two further embodiments which have a structure similar to that according to FIG. 3.
  • a bellows 55 is arranged within the pressure vessel 4, which is attached at one end 56 to the cover 16 of the pressure vessel 4 by a ring 57.
  • the bellows 55 has a flange 58. It is also closed at this end by a membrane 59 or the like.
  • the interior space 60 of the fold bar 55 is in free communication with the atmosphere via an opening 61 in the cover 16 of the pressure vessel 4.
  • a sealing ring 62 is inserted, which is firmly connected to one of the two parts.
  • a support tube 63 is also attached.
  • a support tube 64 fastened to the cover 16 of the pressure container 4.
  • the flange 58 of the bellows 55 is approximately at the level 65, from which it can be moved into the closed position shown by means of a lifting drive 66, and at the same time is placed under prestress. In this position, a flange 58 engages Locking device, of which only two bolts 67 are shown. Before the start of a work cycle, the latches 67 are released so that the bellows lifts under the effect of the pretension and is then accelerated into the position indicated by 65 under the action of the compressed gas on the membrane 59, as a result of which the entire cross section of the opening 6 is suddenly released.
  • the bellows 55 is replaced by a hose 68 which is at least partially attached to a support tube 69 and which is pushed together after the latch 67 is opened under the action of the elastic prestress and the gas pressure. Otherwise, the other structure is the same as in the bellows shown in the left half. Only the lower support tube 63 is missing.
  • FIG. 7 shows an exemplary embodiment in which the desired rapid release of the entire cross section of the opening 6 takes place with the aid of an electrical surge discharge.
  • the high forces and accelerations that can be achieved in this way are used, for example, when shaping metals (transploder technology) to produce high air velocities (plasma wind tunnel) and the like. Like. Used. Since this technique is known, only those details which relate directly to the invention are dealt with here.
  • the circuit essentially has a capacitance, an inductance and an interrupter switch. The capacitor is charged when the switch is open. Closing the switch creates an induction flow.
  • the inductance is arranged as a primary coil 70 around the opening 6 of the pressure vessel 4.
  • On the primary coil 70 is - optionally with the interposition of a sealing ring - a valve plate 71 acting as a secondary coil made of electrically conductive but non-magnetic material, which at the lower end of an elastic holder, for. B. a rolling membrane 72 is attached. This in turn is attached to an open support tube 73.
  • the sealing force of the valve is generated by the pressure in the pressure vessel 4 and acting on the rear of the valve actuator 71.
  • the actual closure member for the opening cross section to be released is formed by the tubular structures 28, 68 and 71, respectively, which are formed by means of a further component (33 in FIGS. 3, 58, 67 in FIG. 6 and 71 in Fig. 7) held in the closed position and either only under the effect of the compressed gas (Fig. 3) or with its supportive effect (Fig. 6 and 7) with an initially effective auxiliary drive (55 in Fig. 6 or internal stress of 68 in Fig. 6, 70, 71 in Fig. 7).
  • Figures 3, 6, 7 only show exemplary embodiments of this principle.
  • FIG. 8 shows a variant of the embodiment shown in Fig. 1. Therefore, only the differences are dealt with here.
  • the control air line consists of a simple compressed air hose 74 which is passed through the pressure vessel 4 and opens out via a connection piece in the space behind the membrane 3.
  • a ventilation nozzle 75 is also connected to this space and is closed with a valve of any type - here a valve flap 76.
  • the ventilation nozzle 75 opens behind the valve flap with an opening 77 in the pressure vessel.
  • the space behind the membrane is filled with compressed gas at a higher pressure than the pressure vessel 4 via the compressed air hose 74 and the membrane 9 is thus kept closed.
  • By opening the valve flap pressure equalization occurs between the pressure vessel 4 and the space behind the membrane 9, which at the same time lifts off from the sealing seat 7.
  • the closure member 9 consists of a plurality of membranes 80 arranged side by side, which in the opening position shown in broken lines run approximately parallel to the axis of the opening 6.
  • Two membranes 81, 82 are stretched between lower strips 83, which pass through the opening 6 of the pressure vessel 4, and upper strips 84, which are arranged in alignment over the lower strips 83, by connecting them to the strips 83 at their longitudinal edges by means of clamping strips 85 or 84 are attached.
  • a sufficiently large opening cross section remains between the strips 83 and 84, respectively.
  • chambers 86 are formed, which are connected to one another and connected to a control compressed air line 87.
  • the chambers 86 are connected to a flap valve 88, via which the control compressed air in the compressed air container 4 can be relieved.
  • the mode of operation is essentially the same as in the embodiment according to FIG. 8, but the closed position is produced by abutment of diaphragms 81, 82 which lie opposite one another.
  • the closure member 9 is formed by two flaps 91 which are inclined towards one another above the opening 6 and in the direction thereof.
  • the flaps 91 are articulated on their mutually facing upper edges in bearings 92, while on their lower edges they are held in the closed position by means of a beam 93 of a holder 94. Sealing takes place on a circumferential sealing seat 95.
  • a plunger 97 which is guided in a housing 96 of the holder 94 and is actuated by a cam disk 98, the flaps are released and suddenly in the pressure container 4 under the action of the compressed gas in the opening position shown in dashed lines nends. There their kinetic energy is destroyed by attenuators 99.
  • the closing movement can be carried out by conventional means, such as springs, pneumatic cylinders or the like, while the locking in the shooting range is done by springs 100.
  • the flaps 91 consist, for example, of a frame made of high-strength light metal alloy, which is covered with a plastic sheet, for example made of polyethylene (PE).
  • the opening 6 of the pressure vessel 4 is penetrated by the strips 101 of a fixed grate 102.
  • a sliding grate 103 is arranged above the grate 102, the strips 104 of which on the side facing the grate 102 are sealed with a sealing material 105, e.g. Low pressure PE, are provided.
  • the strips 101 of the fixed grate 102 are additionally supported by ribs 106 against the static load.
  • the sliding grate 103 is under a spring force 107 and is locked in the closed position shown in FIG. 11 by a locking lever 108.
  • the lock By pivoting the lever up, the lock is released and the stored spring force is suddenly released, so that the sliding grate is accelerated into its open position in which the strips 101 and 104 of the two gratings 102, 103 lie one above the other. In this position, the sliding grate 104 is braked by damping elements, not shown.
  • the sliding grate can be reset in a conventional manner until the locking lever 108 can be moved back into the locked position.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Devices For Molds (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
EP82110996A 1981-12-28 1982-11-27 Dispositif pour comprimer du matériel de moulage pour fonderies Expired EP0084627B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3151645 1981-12-28
DE3151645 1981-12-28
DE3206208 1982-02-20
DE3206208 1982-02-20

Related Child Applications (1)

Application Number Title Priority Date Filing Date
EP85102322.6 Division-Into 1985-03-01

Publications (2)

Publication Number Publication Date
EP0084627A1 true EP0084627A1 (fr) 1983-08-03
EP0084627B1 EP0084627B1 (fr) 1986-05-07

Family

ID=25798338

Family Applications (2)

Application Number Title Priority Date Filing Date
EP85102322A Expired EP0170765B1 (fr) 1981-12-28 1982-11-27 Dispositif pour comprimer du matériel de moulage pour fonderies
EP82110996A Expired EP0084627B1 (fr) 1981-12-28 1982-11-27 Dispositif pour comprimer du matériel de moulage pour fonderies

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP85102322A Expired EP0170765B1 (fr) 1981-12-28 1982-11-27 Dispositif pour comprimer du matériel de moulage pour fonderies

Country Status (4)

Country Link
US (2) US4529026A (fr)
EP (2) EP0170765B1 (fr)
DD (1) DD203693A5 (fr)
PL (1) PL239713A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0139119A1 (fr) * 1983-08-02 1985-05-02 Josef Mertes Procédé et installation pour la compression de matériaux de moulage en forme de grain, par exemple sable de fonderie
WO1985002568A1 (fr) * 1983-12-09 1985-06-20 Bmd Badische Maschinenfabrik Durlach Gmbh Installation de compression d'un produit de moulage pour fonderie au moyen de gaz comprime
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
EP0365461A2 (fr) * 1988-10-21 1990-04-25 Lopez de Foronda Fernandez, Vicente Machines moulage à impulsion de pression d'air

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH664914A5 (de) * 1982-10-15 1988-04-15 Fischer Ag Georg Einrichtung zum verdichten einer masse von koernigem formstoff.
CH666426A5 (de) * 1984-06-25 1988-07-29 Fischer Ag Georg Formanlage.
CH672270A5 (fr) * 1986-12-17 1989-11-15 Fischer Ag Georg
ES2006861A6 (es) * 1988-03-21 1989-05-16 Lopez Foronda Fernandez Vicent Mejoras introducidas en campanas de aire para moldeo por onda expansiva.
DE3836876C2 (de) * 1988-10-29 1994-06-09 Badische Maschf Gmbh Verfahren und Vorrichtung zum Verdichten von Gießerei-Formstoff
CH686412A5 (de) * 1992-03-10 1996-03-29 Fischer Georg Giessereianlagen Verfahren zum Verdichten von Formsand fuer Giessformen.
EP0849017B1 (fr) * 1996-12-17 2001-10-04 Loramendi, S.A. Machines moulage à impulsion de pression d'air
CN105170917B (zh) * 2015-09-30 2017-11-28 共享铸钢有限公司 一种大型圆盘类铸件的快速造型工装及其快速造型方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1102978B (de) * 1954-12-29 1961-03-23 Dietrich Pulvermacher Pressformmaschine
DE2206672B2 (fr) * 1972-02-11 1975-04-03 Nautschno-Issledowatelskij Institut Technologii Awtomobilnoj Promyschlennosti, Moskau
US3983923A (en) * 1974-04-12 1976-10-05 Giovan Battista Albenga Sand blowing head
DE2653788B1 (de) * 1976-11-26 1977-09-15 Eugen Dipl-Ing Buehler Verfahren und vorrichtung zum herstellen von giessformen aus bindemittelhaltigem formsand
DE2833999A1 (de) * 1978-08-03 1980-02-14 Buehler Eugen Verfahren und vorrichtung zur herstellung von giessformen und -kernen
DE2842912A1 (de) * 1978-10-02 1980-04-10 Wagner & Co Alfelder Masch Verfahren und vorrichtung zum herstellen von sandgiessformen o.dgl.

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1961234C3 (de) * 1969-12-05 1975-02-06 Kramatorskij Nautschno-Issledowatel' Skij I Projektno-Technologitscheskij Institut Maschinostrojenija, Kramatorsk (Sowjetunion) Verfahren und Vorrichtung zum Verdichten von GieBereiformmassen
DE2151949A1 (de) * 1971-10-19 1973-04-26 Kramatorskij Ni I Pt I Mash Vorrichtung zum verdichten von formmasse
DE2844464C2 (de) * 1978-10-12 1983-03-24 Bühler, Eugen, Dipl.-Ing., 8871 Burtenbach Verfahren und Vorrichtung zum Verdichten von Gießformen
JPS55141355A (en) * 1979-04-19 1980-11-05 Sintokogio Ltd Mold molding method and its device
JPS55147459A (en) * 1979-08-28 1980-11-17 Nakada Giken:Kk Mold molding method
CH642288A5 (de) * 1980-02-18 1984-04-13 Fischer Ag Georg Verfahren und einrichtung zum verdichten von formstoff, insbesondere fuer giessformen.
SU1006042A1 (ru) * 1981-03-12 1983-03-23 Simchenko Boris N Импульсна головка

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1102978B (de) * 1954-12-29 1961-03-23 Dietrich Pulvermacher Pressformmaschine
DE2206672B2 (fr) * 1972-02-11 1975-04-03 Nautschno-Issledowatelskij Institut Technologii Awtomobilnoj Promyschlennosti, Moskau
US3983923A (en) * 1974-04-12 1976-10-05 Giovan Battista Albenga Sand blowing head
DE2653788B1 (de) * 1976-11-26 1977-09-15 Eugen Dipl-Ing Buehler Verfahren und vorrichtung zum herstellen von giessformen aus bindemittelhaltigem formsand
DE2833999A1 (de) * 1978-08-03 1980-02-14 Buehler Eugen Verfahren und vorrichtung zur herstellung von giessformen und -kernen
DE2842912A1 (de) * 1978-10-02 1980-04-10 Wagner & Co Alfelder Masch Verfahren und vorrichtung zum herstellen von sandgiessformen o.dgl.

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0139119A1 (fr) * 1983-08-02 1985-05-02 Josef Mertes Procédé et installation pour la compression de matériaux de moulage en forme de grain, par exemple sable de fonderie
WO1985002568A1 (fr) * 1983-12-09 1985-06-20 Bmd Badische Maschinenfabrik Durlach Gmbh Installation de compression d'un produit de moulage pour fonderie au moyen de gaz comprime
EP0152573A1 (fr) * 1983-12-09 1985-08-28 BMD Badische Maschinenfabrik Durlach GmbH Dispositif pour compacter du matériau de moulage de fonderie à l'aide d'un gaz de compression
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
EP0365461A2 (fr) * 1988-10-21 1990-04-25 Lopez de Foronda Fernandez, Vicente Machines moulage à impulsion de pression d'air
EP0365461A3 (fr) * 1988-10-21 1991-01-30 Lopez de Foronda Fernandez, Vicente Machines moulage à impulsion de pression d'air

Also Published As

Publication number Publication date
PL239713A1 (en) 1983-08-01
US4529026A (en) 1985-07-16
EP0170765B1 (fr) 1988-08-31
US4609033A (en) 1986-09-02
DD203693A5 (de) 1983-11-02
EP0170765A1 (fr) 1986-02-12
EP0084627B1 (fr) 1986-05-07

Similar Documents

Publication Publication Date Title
EP0084627B1 (fr) Dispositif pour comprimer du matériel de moulage pour fonderies
DE1704313A1 (de) Verfahren und Vorrichtung zum Formen hohler Erzeugnisse
DE3243951C2 (fr)
DE1983793U (de) Vorrichtung zur herstellung von reifen.
CH647700A5 (de) Formmaschine.
EP0152928B1 (fr) Procédé et installation de serrage de matière de moulage de fonderie
DE2423503C3 (de) Vorrichtung zum Herstellen von Hohlkörpern aus thermoplastischem Kunststoff
DE1941736B1 (de) Verfahren bei kastenlosen Formmaschinen zum Einschiessen des Formsandes und Maschine zur Durchfuehrung desselben
DE102016225124A1 (de) Vorrichtung zur dreidimensionalen Formgebung, Steuerungsverfahren für eine Vorrichtung zur dreidimensionalen Formgebung, Herstellungsverfahren für dreidimensional geformte Objekte, Programm und Speichermedium
EP0129210B1 (fr) Machine pour compacter du matériau de moulage de fonderie
DE4319078C2 (de) Verfahren und Formherstellungsmaschine zur Herstellung von Gußformen oder Gußformteilen aus Formsand
DE1479275B2 (de) Verfahren und Vorrichtung zum Abtren nen von Abfallstucken beim Herstellen von Hohlkörpern aus thermoplastischem Kunststoff im Blasverfahren
DE3717558C3 (de) Verfahren zum Herstellen von Sandgießformen von Modellen
DE1210517B (de) Verfahren und Vorrichtung zum Loesen einer Giessereiform mit Ballen aus dem Ballenmodell
EP0203322B1 (fr) Dispositif pour compacter un matériau de moulage de fonderie à l'aide d'un gaz de compression
EP0131723A1 (fr) Dispositif pour le serrage de matière de moulage de fonderie à l'aide de gaz comprimé
EP0673698B1 (fr) Procédé pour la production de moules
DE3142976A1 (de) Vulkanisierpresse fuer reifen
DE2755495C2 (fr)
EP1558413B1 (fr) Moule en fonte a cadre en forme de o
DE19528079C2 (de) Thermoformwerkzeug zur Herstellung von Formteilen aus erwärmter thermoplastischer Kunststoffolie
CH661883A5 (en) Submerged-plunger (hot-chamber piston) die-casting method and a machine for carrying out the method
DE3432368C2 (fr)
DE1486090C (de) Verfahren zum Einfüllen von pulver formigem Gut in oben offene Behalter
CH675553A5 (fr)

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19821127

AK Designated contracting states

Designated state(s): CH FR GB IT LI SE

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): CH FR GB IT LI SE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Effective date: 19860531

ET Fr: translation filed
ITF It: translation for a ep patent filed

Owner name: DR. ING. A. RACHELI & C.

PLBI Opposition filed

Free format text: ORIGINAL CODE: 0009260

26 Opposition filed

Opponent name: GEORG FISCHER AG

Effective date: 19870206

PLBM Termination of opposition procedure: date of legal effect published

Free format text: ORIGINAL CODE: 0009276

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: OPPOSITION PROCEDURE CLOSED

27C Opposition proceedings terminated

Effective date: 19871009

ITTA It: last paid annual fee
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19961113

Year of fee payment: 15

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 19970204

Year of fee payment: 15

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19971125

Year of fee payment: 16

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19971127

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19971130

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19971130

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19971127

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19990730

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST