EP1477251A2 - Procédé et machine à mouler pour fonderie, pour la production d'un moule en sable dans un chassis - Google Patents

Procédé et machine à mouler pour fonderie, pour la production d'un moule en sable dans un chassis Download PDF

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Publication number
EP1477251A2
EP1477251A2 EP04011229A EP04011229A EP1477251A2 EP 1477251 A2 EP1477251 A2 EP 1477251A2 EP 04011229 A EP04011229 A EP 04011229A EP 04011229 A EP04011229 A EP 04011229A EP 1477251 A2 EP1477251 A2 EP 1477251A2
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EP
European Patent Office
Prior art keywords
model
molding
sand
filling
filling frame
Prior art date
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Granted
Application number
EP04011229A
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German (de)
English (en)
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EP1477251B8 (fr
EP1477251A3 (fr
EP1477251B1 (fr
Inventor
Josef Mertes
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EUROMAC TECNOLOGIE IMPIANTI E MACCHINE Srl
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Individual
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Publication of EP1477251A3 publication Critical patent/EP1477251A3/fr
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Publication of EP1477251B1 publication Critical patent/EP1477251B1/fr
Publication of EP1477251B8 publication Critical patent/EP1477251B8/fr
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C11/00—Moulding machines characterised by the relative arrangement of the parts of same
    • B22C11/02—Machines in which the moulds are moved during a cycle of successive operations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C15/00—Moulding machines characterised by the compacting mechanism; Accessories therefor
    • B22C15/28—Compacting by different means acting simultaneously or successively, e.g. preliminary blowing and finally pressing

Definitions

  • the invention relates to a method and a molding machine for producing box-bound Sand molds using one of the upper box and lower box model existing pair of model plates, the upper and lower box shapes in succession are produced and the individual steps for producing a shape in a straight line successive and parallel working stations of a molding machine be performed.
  • Molding machines of this type are known from the documents WO95 / 31302 and EP-0995521. These two designs initially have in common that they have two workstations lying in a straight line one behind the other, whereby the molding box and model plate are joined and filled with molding sand in the first station (sand filling station ) and the compression and demolding takes place in the second station (compression station ) . Furthermore, these two designs have in common that, together with the molding box transport of the molding line, the molding unit filled with molding sand is transported from the sand-cutting station to the compaction station, while at the same time the model plate lowered in the compression station is transported back to the sand-filling station.
  • two filling frames are in circulation, one of the two filling frames in the sand filling station being picked up by the molding box on an upper level and on a lower-lying molding box transport level as part of the molding unit filled with molding sand (model plate, molding box, filling frame) together with the molding box transport Form line is transported from the sand filling station to the compaction station.
  • the other filling frame is separated from the molding box in the compaction station after compaction on the upper level and is transported back from the compression station to the sand filling station at this level at the same time as the molding box transport.
  • the extremely large vertical distance between the mold box transport path and the working positions when compacting and when filling sand into the mold box is particularly disadvantageous.
  • the filling frame becomes after a small lowering stroke of approx. 10mm on a transport track, after which the Mold box is placed on its roller conveyor after another approx. 100mm and what that Demolding begins. With the start of demolding, the filling frame is spaced approx. 100mm above the molding box transported back to the sand filling station and there, as before described, again taken up by the next molding box. The distance of approx.
  • the object of the present invention is to propose a method and a molding machine while avoiding the disadvantages described above and while maintaining the advantages described above for EP-0995521, with which further use of a sand filling station and then a subsequent compression station (two-station molding machine) but without rotating or to be returned filling frames, a cycle time reduction and at the same time an extension of the sand filling time into the molding box can be realized, whereby the extended sand filling time enables layered sand filling into the molding box that is adapted to the model contour.
  • the filling frame function is assigned in two steps, on the one hand to a telescopically and vertically displaceable filling frame on the model carrier frame and on the other hand to a vertically displaceable filling frame which is arranged telescopically at the compression station.
  • the filling frame arranged on the model carrier frame is called “ model filling frame”
  • the filling frame arranged on the compression station is called “compression filling frame” .
  • the model filling frame with the model plate lowered in it and with the molding box placed on it form the filling space for the loose molding sand that is filled in the sand filling station.
  • the compaction filling frame is placed on the molding box and the model plate is raised within the model filling frame up to the molding box support surface, whereby the displaced loose molding sand is shifted into the compression filling frame.
  • the compaction filling frame now has the usual filling frame function for form compression.
  • the task is carried out by a movable Sand filling device with a sand guide funnel attached to the sand discharge, with which the molding sand moves back and forth in the time made available
  • the running movement is applied in layers to the model or in the molding box is filled.
  • the sand guide funnel the lower edge of which is at a short distance is moved to the surface of the molding box, has a rectangular inner cross section in the horizontal on, with the long side lying transverse to the direction of movement the interior of the molding box and the short side lying in the direction of movement approx. 1/4 of the inside of the molding box.
  • the sand guide funnel is inside a sand protection frame that can be placed on the molding box, causing splashing out of the molding sand is prevented.
  • the model-dependent amount of molding sand is increased by height Slides determined in sections at the outlet of the molding sand container through the sand guide funnels are arranged and also during of the molding sand discharge are adjustable for partial adjustment of the amount of molding sand. Due to the time-stretched and layer-by-layer sand filling in the molding box, one gradually becomes increasing and homogeneous molding sand filling in all model sections, in particular the narrow and deep model pockets enables what an optimal shape compression is of particular importance. Optimal compression is dependent on the quality of the Form sand filling decisively influenced, so that the sand filling in the Molding box and the compaction of the same ranking manufacturing sections for manufacturing represent a shape.
  • the model filling frame telescopically encloses the from the model carrier frame and Model plate existing model unit and it is dimensionally accurate compared to the model unit guided and vertically movable.
  • In the lowered state of the model filling frame is his Surface level with model plate surface.
  • In the raised state of the Model fill frame is its surface compared to the model plate surface around required, from the height of the loose sand fill and an empty space height between Sand fill and molding box surface resulting filling frame height increased.
  • the vertical Movability of the model filling frame is mechanical to these two level states limited.
  • the surface of the model filling frame is the contact surface for the The molding box and the model filling frame with the usual centering elements are corresponding Mistake.
  • the molding box lies now at a slight distance from its roller conveyor on the model filling frame and the model plate surface is below the required filler frame height the mold box support surface.
  • the molding sand is now layered and even filled.
  • the sand filling is to a certain extent below the Mold box surface performed so that between the surface of the loose sand fill and an empty space remains on the surface of the molding box and thus during transport no molding sand leading to contamination is stripped off to the compression station.
  • the molding unit filled with molding sand becomes transported from the sand filling station to the compaction station.
  • the vertically movable Compression filling frame lowered and placed on the molding box.
  • the compression filling frame surrounds the compression unit telescopically and it is by means of Guide rods and lifting cylinders attached to it.
  • the compression lifting table is raised, which after driving through an idle stroke through the area of the lower of the model transport device Holds the model carrier frame and this with the model plate resting on it pushes up until the model plate surface is level with the surface of the model fill frame and the model filling frame is also slightly off its roller conveyor is lifted off so that it can swing out for demolding.
  • a corresponding one The proportion of loosely poured molding sand is up into the molding box put on compression filling frame, which is now the usual Filling frame function takes over during compression.
  • This method according to the invention enables a further advantage according to the invention for compacting the molding sand.
  • the compression lifting table takes after driving through of the idle stroke at its full stroke speed on the model unit, the Model unit and thus the loose poured molding sand is suddenly accelerated, whereby the molding sand settles and inhomogeneous filling points are reduced.
  • the air in the molding chamber is compressed by pushing up the molding sand.
  • the compressed air can be removed via model plate nozzles, which leads to fluidization of the molding sand.
  • the fluidization can be additionally increased in the time parallel to Pushing up the molding sand still compressed air is blown into the molding chamber.
  • a particular advantage is that the fluidization of the molding material takes no additional time while lifting the model unit or while pushing up the Molding sand takes place, so that the cycle time of the molding machine through the fluidization is not extended. This is not the case with the prior art. If none or only a few model plate nozzles can be used, but the compressed air can can also be used as the first preliminary stage of compression, after which the main compression process follows. In addition, the displaced air can also via a valve free atmosphere can be dissipated. These different uses can be selected depending on the model requirements. In the further This advantage according to the invention can be used in all the compression methods mentioned above be applied.
  • the molding box When compacting, the molding box lies approx. 6mm above its roller conveyor, so that immediately after compaction, start slowly lowering the compression lift table can, whereby the compression pressure is reduced and then after 6mm Lowering stroke the demolding begins.
  • the compression filling frame is raised to the extent that the molding box with the protruding molding sand is free under the compression filling frame can extend.
  • the model filling frame remains in the lower one when demolding Position, i.e. the surface of the model fill frame and the surface of the model plate remain at the same level. As previously described, the model unit is only in the Sand filling station lowered compared to the model filling frame.
  • FIG. 1 shows the molding machine in a longitudinal section with the sand-filling station A and the compacting station B, wherein a lower box model is a matched pair in an A upper box model and in B.
  • the top box model is shown with a raised model contour and the bottom box model with a recessed model contour.
  • 2 shows a cross section through the sand filling station A and
  • FIG. 3 shows a cross section through the compression station B.
  • the model unit 4.02 shown in these figures has a telescopic and vertically displaceable model filling frame 4.03 ; which accommodates the molding box 4.01 and which is provided with the centering elements 4.21 and 4.22 required for this. Model unit 4.02 and model filling frame 4.03 are described in detail elsewhere.
  • the sand filling station A has a movable molding sand filling device 2.14 with a sand guide funnel 2.15 , with which the molding sand can be filled into the molding unit 4.05 in layers.
  • the sand filling station A has a sand protection frame 2.11 which can be placed on the molding box 4.01 and into which the sand guide funnel 2.15 / 2.16 protrudes, which prevents the molding sand from spraying out when the molding sand is poured in layers.
  • the sand filling station A also has a lifting table 2.01 for lifting the model / filling frame unit 4.04 (model unit 4.02 / model filling frame 4.
  • the compression station B has the compression unit 3.14 with the compression filling frame 3.22 arranged telescopically thereon, which is guided vertically via the four guide rods 3.23 (FIGS. 3, 4) and which can be moved vertically via the two cylinders 3.24 (FIGS . 3, 4). Furthermore, the compression station B has a lifting table 3.01 , with which the molding unit 4.05 is received for the compression process and with which the demolding or lowering of the model / filling frame unit 4.04 is carried out after the compression process.
  • the compression station B also has a horizontally extendable roller conveyor 3.03 for transporting the molding unit 4.05 from station A to station B and a lifting device 5.02 for changing the model.
  • the compression station B also has a push-off device 3.12 , with which the model filling frame 4.03 is pressed down during removal from the mold, so that the release of the model filling frame from the molding box 4.01 centered on it does not only depend on the weight of the model filling frame.
  • the outside dimension 3.11 is determined by the adjacent dimension chain, which characterizes the height structure.
  • the individual devices of stations A and B are integrated in a machine frame, which consists of the head frame 1.02, the base frame 1.01 and the column frames 1.03 .
  • the roller conveyor 1.04 fastened to the column frames 1.03 runs through the machine frame for the transport of the molding boxes 4.01, which are transported by the molding machine in intervals of one molding box division in the direction of arrow 1.08 after the work cycles carried out in stations A and B.
  • the mold boxes lie against each other via their wear-resistant push pins 4.38, whereby the model filling frame 4.03 with the attached model unit 4.02 is carried on the upper model roller conveyors 2.03 and 3.03 by the molding box resting on the model filling frame 4.03 .
  • the molding boxes are fixed in the stations A1 and B1 by the centering devices 1.10 , so that the molding boxes located in the stations A and B have a slight play to one another and are therefore vertically movable.
  • the roller conveyor 1.05 likewise fastened to the column frames 1.03 , for the return transport 1.09 of the model / filling frame unit 4.04 runs from the station B to the station A through the machine frame .
  • the compressed air pulse method is shown for the compression. However, other compression methods can also be used, which will be discussed in detail elsewhere.
  • FIG. 1 shows the starting position of the molding machine at the beginning of a working cycle.
  • an upper box molding unit 4.05 (model unit 4.02, model filling frame 4.03, molding box 4.01) filled with loose molding sand in station A and a lower box with a finished mold in station B.
  • the model filling frame 4.03 with its track 4.30 (Fig. 2) stands on the indented upper model roller conveyor 2.03, whereby the molding box 4.01 resting on the model filling frame 4.03 is 2.06 (approx. 3 mm) above its roller conveyor 1.04 .
  • the model unit 4.02 is lowered within the model filling frame 4.03 and lies with the supporting bolts 4.23 (Fig.
  • the molding unit is filled with loose molding sand and the loose molding sand surface is 2.08 below the surface of the molding box, which prevents the molding sand from being stripped off during the transport of the molding box. Furthermore, in the starting position, the lifting table 2.01 is lowered, the sand protection frame 2.11 is raised and the molding sand filling device 2.14 is in the right-hand starting position 2.35.
  • the molded molding box 4.01 is set down on its roller conveyor 1.04 , the upper model roller conveyor 3.03 is engaged and the compression filling frame 3.22 has been lifted from the molded molding box to such an extent that the molding sand protruding from the top of the molding box is prevented from being stripped off during the mold box transport (M ⁇ 3 . 09).
  • the excess molding sand is cut off from below after turning the molding box within the molding line.
  • the mold box centering devices 1.10 are open, the lifting table 3.01 is lowered and the model unit 4.02 with the model filling frame 4.03 lowered on it is placed on the lower model roller conveyor 1.05 .
  • the molding sand filling device 2.14 is sand-free, so that it is only refilled before a restart.
  • a new work cycle begins with the molding box transport of the molding line, the molding boxes 4.01 being shifted by one division in the direction of the arrow 1.08 .
  • the model filling frame 4.03 with the model unit 4.02 is carried on the upper model roller conveyor 2.03 / 3.03 .
  • the molding unit 4.05 filled with loose molding sand is in station B and an empty molding box in station A.
  • the model unit 4.02 located below in station B with the model filling frame 4.03 lowered on it is moved back from station B to station A on the lower model roller conveyor 1.05 .
  • the mold boxes in A1 and B1 are fixed by closing the centering devices 1.10 and at the same time the upper model roller conveyor 2.03 is opened in station A. Furthermore, the two lifting tables 2.01 and 3.01 are raised and the compression filling frame 3.22 and the sand protection frame 2.11 are placed on the respective mold boxes below.
  • the lifting table is 3:01 on the control side to ensure that the Verdichtungs colllrahmen 3:22 comes on the molding box 4:01 to the support before the lifting table 3:01 detects the model unit 4.02 and pushes up the displaced loose mold sand in the Verdichtungs colllrahmen 3.22.
  • the lifting table 2.01 which rises in station A, lifts the model unit 4.02 with the model filling frame 4.03 still lowered on it under the empty molded box 4.01 , which has been moved into station A, and lifts it approx. 6mm (dimensions 2.05, Fig. 2) from its roller conveyor 1.04 .
  • the model roller conveyor 2:03 with about 3mm game Checking of illegal listening 2.04 Figure 2) is inserted below the scroll bar 4.30 of Modell colllrahmens 4.03 after which the lifting table 2:01 lowers again and the Modell colllrahmen 4:03 on the inserted model roller conveyor 2:03 deposited (Fig.2) ,
  • the molding box resting on the model filling frame 4.03 then has a distance of approx.
  • Electromagnets 2.02 are arranged in the lifting table 2.01 , which exert an adhesive force on the model unit 4.02 during the downward movement in the area 2.07 , so that the model unit's own weight and the additional adhesive force ensure that the model unit is safely lowered within the model filling frame.
  • an electromagnet with a diameter of 150mm and a height of 50mm has an adhesive force of 5000N with an air gap of 1mm
  • the Sandein committee begins in the form of unit 4:05, for which a period of about 60% of the total cycle time for Available.
  • the molding sand here, is preferably filled by an on the rails 24/02 between the two positions 2:35 and 2:36 back and forth movable Formsandein spallvorraum 2.14 a Sandleittrichter 2:15 in multiple layers in two layers in the molding unit 4:05.
  • a first time phase of the molding sand filling for example during the filling of the first layer 2.38 (FIG.
  • the model unit 4.02 is lowered within the model filling frame 4.03 with the lifting table 2.01 by the dimension 2.07 , whereby the filling space 2.39 is formed.
  • the model unit 4.02 is held by the support bolts 4.23 (Fig. 07) on the model filling frame 4.03 , but the lifting table 2.01 is further lowered to the lower end position.
  • two aerators (spiked rollers ) 2.19 are arranged in the sand guide 2.15 , which run in the opposite direction of rotation. Because of the possibility of installing the aerators, the sand guide funnel 2.15 is divided into segments 2.16 and 2.17 in the lower area.
  • the sand guide funnel segments 2.16 and 2.17 are extended downwards in order to avoid caking of the molding sand (Fig . 1 and 2 ).
  • the lifting table can be provided at lower lying arrangement on each side with two receiving bars 2.01 wherein the female strips when lifting of the lift table 2.01 in the scroll bars 4.30 of Modell colllrahmens drive 4:03 and lift it from the support surface 4:39 extent to A distance of approx. 3 mm has been reached between the collar of the support bolt 4.23 and the plastic washer 4.24 (FIG. 7) .
  • the surface of the lifting table 2.01 reaches the lower surface of the model unit 4.02 , so that the model filling frame 4.03 and the model unit 4.02 are now lifted from the lifting table 2.01 to the upper end position.
  • the lifting table 2.01 After closing the model roller conveyor 2.03, the lifting table 2.01 lowers again and places the model filling frame 4.03 with its track 4.30 on the model roller conveyor 2.03 and then after a further approx. 3 mm lowering stroke, the model unit 4.02 is held by the supporting bolt 4.23 (Fig. 7) on the model filling frame 4.03 and the lifting table 2.01 lowers to the lower end position.
  • the filling space 2.23 is already made when the lifting table 2.01 arrives at the top and sand filling begins.
  • the model unit In order to ensure 4:03 in the initial lifting of the lift table 2.01 safe release of Modell colllrahmens of the Modelleinaku 4.02, the model unit is held to 4:02 of stroke by a clamping device on the model roller conveyor 1:05.
  • the molding sand filling device 2.14 consists of a chassis 2.22 provided with rollers 2.23 and a cylinder drive 2.25 , which can be moved back and forth on the rails 2.24 and in which a conveyor belt 2.20 , a metering vessel 2.21 with at least three discharge slides 2.26 and the sand guide funnel 2.15 with the aerators 2.19 is arranged. Furthermore, the sand protection frame 2.11 belongs to the molding sand filling device, which can be deposited on the molding box by means of the short stroke cylinders 2.12 via a spherical cap connection 2.13 and which prevents molding sand from splashing out during the sand filling.
  • the internal dimensions of the sand protection frame 2.11 are slightly smaller than the internal dimensions of the molding box in order to avoid sand deposits on the molding box by the size 2.10 (Fig. 2) .
  • the sand guide funnel 2.15 / 2.16 which is located a short distance 2.09 above the molding box, has a rectangular inner cross section (Fig. 1, Fig. 2 ) in the horizontal, with the long side (Fig. 2) lying transversely to the direction of movement, the inner region of the molding box and the short side 2.40 lying in the direction of movement corresponds approximately to 1/3 to 1/6, preferably 1/4 of the inside of the molding box, which enables the sand to be filled in layers.
  • the available time as a constant is fully used for the sand filling in the form unit 4.05 .
  • the amount of molding sand to be filled into the molding unit is determined by the conveying speed of the conveyor belt 2.20 and by the position 2.30 of the discharge slide 2.26 .
  • the discharge slides 2.26 are therefore also adjustable during the molding sand filling or during the movement of the molding sand filling device 2.14 in order to adapt the amount of molding sand to the partial need.
  • the molding sand is filled into the molding unit 4.05 in at least three sections 2.18a ( FIG. 2 ) and accordingly, each discharge slide 2.26 in the sand guide funnel 2.15 is assigned a shaft 2.18 (FIG.
  • the number of discharge slides 2.26 and the associated shafts 2.18 in the sand guide funnel depends on the inside dimension of the molding box to be covered, although at least three discharge slides or three shafts are required.
  • a control element 2.28 monitoring the molding sand flow is attached to each outlet slide, a plate suspended vertically by gravity being lifted by the molding sand flow and thereby actuating a sensor 2.29.
  • a flap 02/31 in each well 2.18 a in a continuous and cylindrical actuated shaft 2:33 which is open during the Formsandein colllung in the mold unit 4:05 and which is pressed during the standstill of the conveyor belt 20.2 with its rubber lip 2:32 against the conveyor belt 2.20 to to prevent the embankment sand from trickling off the conveyor belt onto the model / filling frame unit 4.04 arriving at station A on the roller conveyor 1.05 .
  • the dosing vessel 2.21 is filled by a stationary storage bunker 2.37 , the level in the dosing vessel 2.21 being monitored by sand probes.
  • the functional height 2.07 (3.07, 4.07) of the model filling frame 4.03 is designed so that the loose molding material surface of the finished molding sand filling is approx. 30mm (dimension 2.08) below the surface of the molding box, which prevents molding sand from being stripped off during transport of the molding unit 4.05 from A to B and which keeps the molding machine clean and free of hold-up sand.
  • the layered and partially adapted molding sand filling enables an almost flat and even surface of the loose molding material ( 2.08 Fig. 1).
  • the layer-by-layer and partially adapted molding sand filling with the appropriate height of the model and compaction filling frames also enables a loose molding material surface adapted to the model contour, so that the molding sand is of equal height at all points.
  • the highest point of the loose molding sand surface is again approx. 30mm ( M ⁇ 2.08 ) below the molding box surface .
  • the individual drive elements 2.27 of the discharge slide 2.26 and the drive cylinder 2.25 of the sand filling device 2.14 each have a displacement measuring system.
  • each displacement measuring point of the drive cylinder 2.25 is recorded a certain opening position 2.30 of the individual discharge slide 2.26 assigned.
  • the path measurement is carried out in a continuously linear manner in digital or analog form, the path measurement points of the drive cylinder 2.25 for the assignment of the discharge slide position being conveniently tapped in small grids of, for example, 1 mm.
  • the opening positions for the forward and return of the drive cylinder 2.25 or the sand filling device 2.14 are the same at the respectively assigned measuring points. However, it is also possible for the opening positions at the respectively assigned measuring points to have a different value for the advance than for the return.
  • the setpoint values from the respective data record are processed in a corresponding electronic control device and the discharge slide 2.26 is output as a control command to the drive elements 2.27 .
  • a record is stored in the electronic control device for each individual model, the record being changeable online for the purpose of optimization.
  • the data record which in addition to the data for molding sand filling can also contain other data such as compaction data, casting data, etc., is permanently assigned to the model ID number.
  • the model ID number which has an upper and lower edge identifier, is attached to the model unit in coded form.
  • the model ID number including the upper or lower box identifier, is automatically read out, which gives immediate access to the data record, so that the new parameters are immediately available and the molding machine can be set to it without delay.
  • the setpoints stored in the data record for the individual discharge heights 2.30 and for the conveying speed of the conveyor belt 2.20 are based on a standard molding sand moisture. In the event of deviations from this standard mold sand moisture, these setpoints are automatically adapted to the mold sand moisture measured in each case.
  • the lifting table 3.01 moving up in station B , picks up the model unit 4.02 at its full lifting speed after passing through the lower idle stroke 3.21 and pushes it upwards within the model filling frame 4.03 with the loose molding sand, the model filling frame opening along path 3.07 (Fig. 3) the support surface 4.39 of the model unit 4.02 comes to rest and the model plate surface and the surface of the model fill frame 4.03 are at the same level or the dimension 3.07 is zero.
  • the lifting table 3.01 lifts the model unit 4.02 with the model filling frame 4.03 another approx. 3mm (M ⁇ 3.04, Fig. 3) so that the model roller conveyor 3.03 can extend. In this position, the lifting table 3.01 has reached its uppermost end position for the compression and the molding chamber 3.13 is closed.
  • An internal offset 4.40 (Fig. 2, Fig. 6) from the model filling frame to the molding box prevents a sand jam edge at the transition between the model filling frame and the molding box when the molding sand is pushed up.
  • the molding chamber 3.13 (FIG. 3, left half section) is formed vertically by the inner walls of the molding box 4.01 and the compression filling frame 4.03, and horizontally by the model surface and the underside of the compression unit 3.14 or 3.18 . Since the molding box resting on the model filling frame 4.03 has already been lifted approx.3mm from its roller conveyor 1.04 in station A , the molding box is now approx.6mm (dimension 3.05 , Fig. 3 ) above its roller conveyor. The lifting table 3.01 is fixed in this position against the compression pressure.
  • the compression filling frame 3.22 placed on the molding box is pressed onto the molding box via the cylinders 3.24 with a force which is greater than the force which results from the compression pressure and the area of the circumferential gap 3.26 , so that the compression filling frame 3.22 does not lift off during compression can.
  • the molding chamber 3.13 in which the compression pressure is brought to bear , is sealed off from the outside atmosphere by the elastic seals 3.28, 3.29 and 4.33 .
  • the seal 3.29 between the compression unit 3.14 and the compression filling frame 3.22 is clamped to the compression unit with a clamping strip 3.30 and it has an elastic projection 3.31 which, due to a slight play, has no contact with the inner wall of the compression filling frame 3.22 .
  • the seal is made by pressing the peripheral flange 3.25 of the compression filling frame onto the elastic sealing protrusion 3.31 . During the compression, the contact pressure or closing pressure on the seal 3.29 is increased even further by the compression pressure in the molding chamber.
  • the sealing between the compression unit 3.14 or 3.18 and the compression filling frame 3.22 can also be carried out as shown in FIG .
  • a circumferential profile groove 3.33 is milled into the compression unit, into which a seal 3.32 , which is embedded in the compression filling frame 3.22 and can be activated with compressed air, is pressed.
  • the groove profile has a bead 3.34 in the middle, with which the inflated or activated seal 3.32 is secured against vertical displacement by the pressure in the molding chamber 3.13 .
  • the seal 3.32 retracts due to its elasticity so that it has no contact with the compression unit.
  • FIGS. 1 and 3 An air pulse compression unit 3.14 is shown in FIGS. 1 and 3 .
  • the air impulse compression takes place by suddenly opening the closely arranged impulse nozzles 3.16, whereby the compressed air suddenly shoots from the storage container 3.15 into the molding chamber 3.13 and acts as a pressure wave on the molding sand.
  • An internal offset 3.10 (Fig. 3) from the compression filling frame 3.22 to the molding box 4.01 avoids a sand jam edge at the transition between the compression filling frame and molding box during pulse compression.
  • the bulkheads 3.17 are arranged below the compression unit 3.14 , as a result of which the pressure wave during the compression section 3.08, (FIG.
  • the lifting table 3.01 with model unit 4.02 and model filling frame 4.03 is lowered in rapid traverse, whereby the model unit 4.02 with model filling frame 4.03 resting on it is placed on the lower model roller conveyor 1.05 .
  • the compression filling frame 3.22 is lifted from the molding box by the distance 3.09 (FIG. 1) and the model roller conveyor 3.03 is pushed in to accommodate a molding unit 4.05 again .
  • model filling frame 4.03 is pressed down on its pressure plates 4.32 by the push-off device 3.12 for a short distance, so that the release of the model filling frame 4.03 from the molding box 4.01 centered on it is not only dependent on the weight of the model filling frame.
  • work station B shows, for example, a combined compression unit 3.18 for pneumatic airflow pressing and for pneumatic expansion pressing, the pneumatic expansion pressing being known from EP-1155761-A1.
  • the multi-airpress system is also known from EP-1155761-A1, which can also be used here.
  • the compression unit 3.18 shown in FIG . 9 also enables compression by "model pressing ", the molding sand being supported on the extended pressing dies 3.19 and the model being pressed into the molding sand from below.
  • the press ram cylinders 3.20 can be set to the full compression pressure, whereby they can compensate accordingly during the compression of the model contour.
  • the press ram cylinders 3.20 can also be set with a lower pressure, so that after reaching this pressure they are all pushed upwards by the correspondingly slightly compressed molding sand and the final compression is then carried out with a correspondingly high pressure from above by lowering the press rams.
  • the upper machine frame 1.02 is suitable for the installation of the compression systems described.
  • the airflow to be blown in from above can already be initiated when the lifting table 3.01 detects the model unit 4.02 for pushing up.
  • the expansion press is used, the air flow to be blown in from below is initiated when the mold chamber 3.13 is completely closed, i.e. when the lifting table 3.01 has also raised the model unit 4.02 to such an extent that the contact surface 4.39 grips the model filling frame 4.03 and the seal 4.34 becomes effective.
  • the invention has another significant advantage for compression.
  • the compression lifting table 3.01 picks up the model unit 4.02 , which, and thus the loosely filled molding sand, is suddenly accelerated, as a result of which the molding sand settles and inhomogeneous filling points are reduced.
  • this sudden pick-up of the 4.02 model unit by the 3.01 lift table only causes a dull, non-distracting impact.
  • the mold chamber 3.13 is closed and sealed when the model unit 4.02 is lifted within the model filling frame 4.03 or when the molding sand is pushed up into the compression filling frame 3.22 .
  • the molding chamber By pushing up the molding sand, the molding chamber is reduced and the air inside is compressed when the valves 3.35 and 3.36 are closed.
  • the compressed air is discharged via the model plate nozzles 4.06 and via the edge slot 4.14 , as a result of which the loosely poured molding sand is fluidized.
  • the fluidization can optionally be increased by additionally blowing compressed air into the molding chamber 3.13 via the valves 3.36 and via the openings 3.27 (FIGS. 1, 3).
  • the pressure to be applied at pressure valve 3.37 and the amount of compressed air to be blown at valves 3.36 can be adjusted.
  • the blowing in takes place when the loosely poured molding sand is pushed up. It can start at the earliest when the compression filling frame 3.22 has been placed on the molding box 4.01 .
  • Figures 6, 7 and 8 show the model unit 4.02 with the model filling frame 4.03, which are also shown in a reduced scale in Figures 1, 2 and 3 .
  • Fig. 6 shows a longitudinal section showing the guidance and centering of the model filling frame to the model unit.
  • 7 shows a longitudinal section showing the suspension of the model unit 4.02 in the model filling frame 4.03.
  • 8 shows a top view of the model fill frame and model unit.
  • the model unit 4.02 has a base frame 4.08 with the height 4.25 , which can accommodate a positive model 4.10 (FIG. 1, station A) or a negative model 4.12 (FIG. 1, station B ).
  • the models are equipped with model plate nozzles 4.06 according to the requirements, whereby the fluidizing air flow and the displaced compression air can escape or whereby compressed air can be blown into the molding chamber 3.13 from below during expansion pressing.
  • the base frame has the openings 4.26 , which are congruent with corresponding openings in the lifting table 3.01, for discharging the air of the fluidization flow and for blowing in the compressed air for the expansion pressing.
  • an intermediate frame 4.09 is used, which is inserted between the model plate 4.11 and the base frame 4.08 and which centers the model plate 4.11 to the base frame 4.08 via the centering elements 4.15 .
  • the use of an intermediate frame depends on the model depth .
  • the centering of the model 4.12 to the base frame 4.08 also takes place via the previously described centering elements 4.15 .
  • the centering takes place directly between model 4.12 and the base frame 4.08 via the centering elements 4.16.
  • the base frame 4.08 furthermore has the centering and guide pins 4.17 , with which the model fill frame 4.03 is centered on the base frame 4.08 via its centering and guide bushes 4.20 and with which the model fill frame is guided during vertical displacement.
  • the centering and guide pins 4.17 have a tightly toleranced fine centering in the lower area 4.18 for precise adjustment during molding, while the rest of the area 4.19 has an accurate but smooth-running guide.
  • the centering and guide pins 4.17 are immersed in an enclosed space 4.27 , so that they are protected against contamination.
  • a thin layer of graphite can be applied to the center of the encapsulated space to dry-lubricate the centering and guide pins.
  • All centering point because of the Stich thoroughlytoleranzen and optionally differential thermal expansion on the one hand a round pin / round hole and on the other hand, a flat pin / flat hole executed on the pattern plate 11.4 and the model 12/04 has a peripheral fitting strip 13.4, which wear-resistant from a wear-resistant and slidable plastic or of a and slidable metal material.
  • the fitting strip 4.13 has the function of the molding sand seal between the model plate 4.11 or model 4.12 and the model filling frame 4.03 and it has a slight play of, for example, 0.2 mm to the inner wall of the model filling frame.
  • the marginal slot 4.14 resulting from the play enables the air to flow through when fluidizing and with expansion pressing , so that the arrangement of model plate nozzles (0.3 mm slot width) in the edge area can be dispensed with.
  • the vertical displacement of the model unit 4.02 within the model fill frame 4.03 is limited on the one hand by the support of the model fill frame on the support surface 4.39 of the base frame 4.08 and on the other hand by the support bolts 4.23 shown in FIG . 7 and attached to the base frame.
  • the model unit with the support bolts hangs on the model filling frame, the support bolts resting on the washers 4.24 made of impact-resistant plastic.
  • the support bolt has a greater clearance for drilling the window 4.24 and the hole below it in the flange 4.29 of the model filling frame, so that it can be moved through these holes without contact.
  • the support bolts 4.23 are immersed in an enclosed space 4.28 so that they are protected against contamination.
  • the surface of the Modell colllrahmen 4:03 is the support surface for the mold box 4.01, and accordingly, the Modell oscilllrahmen the evident from Fig.1 centering 4.21 for the upper box and 4.22 for the lower box with the usual round hole / Rundung- or flat hole / flat pin execution on.
  • the position of the different centering elements and the position of the supporting bolts are shown in FIG. 8 with the top view of the model unit and model filling frame.
  • the top of the model filling frame 4.03 has a seal 4.33 , with which the mold chamber 3.13 is sealed together with the other seals 3.28 and 3.29 to the outside atmosphere.
  • the model filling frame has a seal 4.34 on the underside, which seals the interior of the model unit 4.02 during the expansion pressing to the outside atmosphere.
  • This seal 4.34 is required because during expansion pressing , compressed air is blown into the molding chamber 3.13 via the holes 4.26 and the model plate nozzles 4.06 . Seal 4.34 may also be required for other molding sand filling systems.
  • the model filling frame has the surrounding flanges 4.29 and 4.30 with an inclined roof 4.31 above it, the sloping roof preventing sand deposits on the flanges 4.29 and 4.30 .
  • the surrounding flanges cover the bearing surface 4.39 of the base frame 4.08, so that it is protected from direct sandfall. Air sand occasionally falling in small quantities can be easily removed by automatic blowing.
  • the flange 4.29 contains the centering and guide bushes 4.20 for centering and guiding the model filling frame and the washers 4.24 for supporting the support bolts 4.23.
  • the flange 4.30 (Fig. 2 and 3) serves as a runner for the model filling frame 4.03, whereby the model filling frame with the model unit 4.02 can be transported on the model roller conveyors 2.03 and 3.03 .
  • the base frame 4.08 also has the cleaning brushes 4.35 for cleaning the lifting tables 2.01 and 3.01 and the centering bolts 4.36 for centering the base frame on the lifting tables 2.01 and 3.01 .
  • the surface of the model plate 4.11 or the model 4.12 lies by the measure compared to the surface of the model filling frame 4.03 4.37 (Fig.
  • the mold parting surface has a corresponding projection over the mold box surface, as a result of which the joined mold halves come to lie on one another with their mold parting surfaces and the mold box parting surfaces have a corresponding play with one another, thereby preventing the formation of burrs and fried iron.
  • the surfaces of the model plate 4.11 or model 4.12 can also be exactly the same level as the surface of the model filling frame 4.03 .
  • the inside dimension of the model filling frame 4.03 is slightly smaller than the inside box dimension to avoid a sand jam edge when pushing up the molding sand by the dimension 4.40 (Fig. 2, Fig. 6) .
  • the cavities of model unit 4.02 are filled with wooden or plastic blocks 4.41 .
  • the adjustment between the molding box 4.01 and the model 4.10 / 4.11 / 4.12 takes place via the non-moving centering elements 4.15 / 4.16 and furthermore via the moving centering elements 4 .17 / 4.18 / 4.20 and 4.21 / 4.22, whereby the offset between the molding box and the model occurs appropriate selection of fits can be limited.
  • a fit selection for 4.15 / 4.16 with H7 / h6, for 4.17 / 4.18 / 4.20 with H7 / g6 and for 4.21 / 4.22 with H7 / e8 results in an offset of 0.072mm to 0.178mm.
  • the model changing device initially has the lifting devices 5.01 (station A) and 5.02 (station B) shown in FIGS . 1, 2, 3 and 5, which are provided with non-driven rollers.
  • model change device the two driven roller conveyors 5:09 (axis A) and 5.10 (axis B), and a movable on floor rails and provided with a driven roller track shuttle cart 5:11 on during normal molding machine operation with an OK / UK model pair, the two lifting devices 5:01 / lowered 5:02 and the return of of the model unit 4.02 and the Modell colllrahmen 4:03 existing model / Medrahmenech 4:04 takes place on the lower model roller conveyor 1:05.
  • model change roller conveyor 5.09 (axis A) there is a UK model / filling frame unit 4.04 and on the shuttle car 5.11 in axis A there is an OK model / filling frame unit 4.04 for changing.
  • the two lifting devices 5.01 and 5.02 When changing models or during constant model circulation, the two lifting devices 5.01 and 5.02 are raised, whereby in station A lifting table 2.01 lifts a model / filling frame unit 4.04 from the rollers of lifting device 5.01 and in station B lifting table 3.01 a model / filling frame unit 4.04 puts down the rollers of the lifting device 5.02 .
  • the lifting and lowering of the two lifting devices 5.01 and 5.02 basically only takes place when the two lifting tables 2.01 and 3.01 are raised, i.e. when the model roller conveyor 1.05 is free in the two stations A and B , so that the two lifting devices 5.01 and 5.02 are only empty be moved up and down.
  • Each of the two lifting devices 5.01 and 5.02 is moved vertically by four cylinders 5.03 , the cylinders having continuous piston rods 5.04 for guidance, so that no further guide rods are required. Since the lifting devices 5.01 and 5.02 are only moved up and down empty, an approximate synchronization of the four cylinders 5.03 is sufficient , which can be achieved with simple throttle check valves . Dome fasteners 5.05 between the piston rod and the lifting device prevent lateral forces on the piston rods. For reasons of space, the lifting devices 5.01 and 5.02 have no driven rollers. Cylinders 5.06 and 5.08 are provided to drive the model / filling frame unit 4.04 on the non-driven rollers.
  • the model / filling frame unit 4.04 is pushed off the lifting device 5.02 until it reaches the driven roller conveyor 5.10 .
  • the cylinder 5.06 which has an electromagnet 5.07 that can be switched on and off, takes over the incoming model / filling frame unit 4.04 before it leaves the driven roller conveyor 5.09 and pulls it adhering to the electromagnet 5.07 into the end position.
  • the UK model / filling frame unit 4.04 available on the roller conveyor 5.09 is moved into station A and the UK model / filling frame unit 4.04 lowered in station B onto the rollers of the lifting device 5.02 extended onto the roller conveyor 5.10 .
  • the OK model / filling frame unit 4.04 Simultaneously with the entry of the UK model / filling frame unit 4.04 into station A , the OK model / filling frame unit 4.04, which is available on the shuttle carriage 5.11 in axis A , is moved onto the roller conveyor 5.09 .
  • the shuttle car 5.11 then travels to the roller conveyor 5.10 (axis B), takes over the LTK model / filling frame unit 4.04 there and returns to the roller conveyor 5.09 (axis A) .
  • the OK model / filling frame unit 4.04 that has arrived on the roller conveyor 5.09 is moved into the station A and the OK model / filling frame unit 4.04 , which has meanwhile been lowered onto the rollers of the lifting device 5.02 in the station B, is extended onto the roller conveyor 5.10 .
  • the UK model / filling frame unit 4.04 which is available on the shuttle carriage 5.11 in axis A , is moved onto the roller conveyor 5.09 .
  • the shuttle 5.11 then travels to the roller conveyor 5.10 (axis B), takes over the OK model / filling frame unit 4.04 there and returns to the roller conveyor 5.09 (axis A) .
  • the model change is now complete and the replaced model / filling frame units 4.04 on the roller conveyor 5.09 and the shuttle car 5.11 can be converted for the next model change.
  • the molding machine can also be operated with two pairs of models in a constant model cycle.
  • the process is the same as described above for the model change and there is a model change practically every molding machine cycle.
  • This operating mode is indicated if the models have to be treated before molding, for example by setting cooling irons and / or exothermic feeders. For this, the models for handling 5.13 are freely accessible.
  • the dwell time for the model treatment is specified by the molding machine cycle time and is sufficient for a normal model treatment.
  • the dwell time for the model treatment without increasing the cycle time can be achieved by taking a pair of models without treatment need at least twice in succession, while the other model pair is treated in the meantime and then into a single molding process Forming machine is replaced and then this 2: 1 cycle or 3: 1 cycle is repeated according to the lot size.
  • the molding machine according to the invention is a high-performance molding machine with an extremely short cycle time.
  • the molding machine is designed as a twin molding machine with two molding sand filling devices in station A and two compacting units in station B , whereby two molds are produced simultaneously within the cycle time.
  • station A a pair of models (OK / UK) is put together with the molding boxes and filled with molding sand, while in station B another model pair (OK / UK) is compressed and demolded.
  • the mold boxes are moved by two mold box divisions, whereby at the same time a finished pair of molds consisting of upper box and lower box is moved out of station B of the molding machine, an upper box / lower box molding unit filled with molding sand is moved from station A to station B and one empty pair of molded boxes consisting of upper and lower boxes is moved into station A.
  • the molding surface of the molding box has a rectangular cross section, as in the exemplary embodiment described above, the molding box is expediently carried out transversely to the longitudinal axis of the molding box in order to shorten the transport path of a double molding box division.
  • the double molding sand filling device is moved transversely to the molding box camouflage direction on the head frame of the molding machine, so that the layer-by-layer sand filling, as in the previously described single version, also advantageously takes place via the longitudinal axis of the molding box.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Devices For Molds (AREA)
  • Mold Materials And Core Materials (AREA)
EP04011229A 2003-05-14 2004-05-12 Procédé et machine à mouler pour fonderie, pour la production d'un moule en sable dans un chassis Expired - Lifetime EP1477251B8 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10321532A DE10321532A1 (de) 2003-05-14 2003-05-14 Verfahren und Formmaschine zur Herstellung kastengebundener Sandformen
DE10321532 2003-05-14

Publications (4)

Publication Number Publication Date
EP1477251A2 true EP1477251A2 (fr) 2004-11-17
EP1477251A3 EP1477251A3 (fr) 2005-04-06
EP1477251B1 EP1477251B1 (fr) 2008-02-27
EP1477251B8 EP1477251B8 (fr) 2008-07-16

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ID=29414367

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04011229A Expired - Lifetime EP1477251B8 (fr) 2003-05-14 2004-05-12 Procédé et machine à mouler pour fonderie, pour la production d'un moule en sable dans un chassis

Country Status (3)

Country Link
EP (1) EP1477251B8 (fr)
AT (1) ATE387273T1 (fr)
DE (2) DE10321532A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104001871A (zh) * 2014-04-15 2014-08-27 青岛博大铸造机械有限公司 垂直分型造型机
DE102016106423B4 (de) 2015-04-17 2021-07-08 Fanuc Corporation Sandgussformherstellungssystem und Sandgussformherstellungsverfahren zum Herstellen einer Sandgussform
CN115194090A (zh) * 2022-07-25 2022-10-18 共享智能装备有限公司 一种3d打印砂型及铸造方法

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2472600C1 (ru) * 2011-05-24 2013-01-20 Закрытое Акционерное Общество "Литаформ" Способ изготовления литейных форм и устройство для его осуществления
CN114160752B (zh) * 2021-11-25 2024-04-30 成都桐林铸造实业有限公司 一种铸造砂过滤装置
CN114425604B (zh) * 2021-12-28 2024-06-21 株洲凯丰实业股份有限公司 燃气涡轮轴承座可溶芯模具

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0731742B1 (fr) * 1994-05-18 1997-06-11 Künkel-Wagner Prozesstechnologie GmbH Remplissage et formage jumeles de moules en sable
DE19848049A1 (de) * 1998-10-19 2000-04-20 Josef Mertes Gießerei-Formmaschine

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104001871A (zh) * 2014-04-15 2014-08-27 青岛博大铸造机械有限公司 垂直分型造型机
CN104001871B (zh) * 2014-04-15 2017-07-14 青岛博大铸造机械有限公司 垂直分型造型机
DE102016106423B4 (de) 2015-04-17 2021-07-08 Fanuc Corporation Sandgussformherstellungssystem und Sandgussformherstellungsverfahren zum Herstellen einer Sandgussform
CN115194090A (zh) * 2022-07-25 2022-10-18 共享智能装备有限公司 一种3d打印砂型及铸造方法

Also Published As

Publication number Publication date
EP1477251B8 (fr) 2008-07-16
ATE387273T1 (de) 2008-03-15
EP1477251A3 (fr) 2005-04-06
DE10321532A1 (de) 2003-12-04
EP1477251B1 (fr) 2008-02-27
DE502004006296D1 (de) 2008-04-10

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