EP0652812A1 - Vorrichtung und verfahren zum aufbringen eines giesstümpels auf ein sandpaket. - Google Patents
Vorrichtung und verfahren zum aufbringen eines giesstümpels auf ein sandpaket.Info
- Publication number
- EP0652812A1 EP0652812A1 EP93912649A EP93912649A EP0652812A1 EP 0652812 A1 EP0652812 A1 EP 0652812A1 EP 93912649 A EP93912649 A EP 93912649A EP 93912649 A EP93912649 A EP 93912649A EP 0652812 A1 EP0652812 A1 EP 0652812A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- shot
- sand
- pouring
- boiler
- ejection
- 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
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C13/00—Moulding machines for making moulds or cores of particular shapes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C15/00—Moulding machines characterised by the compacting mechanism; Accessories therefor
- B22C15/23—Compacting by gas pressure or vacuum
- B22C15/24—Compacting by gas pressure or vacuum involving blowing devices in which the mould material is supplied in the form of loose particles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
- B22C9/082—Sprues, pouring cups
Definitions
- the invention relates to a device for applying a pouring pool or funnel consisting of molding material, in particular molding sand, to a molding material or sand package.
- the present invention relates to the field of foundry technology.
- foundry cores or molds are usually produced in separate parts, brought together and connected to one another to form a casting mold or a sand packet.
- These sand packs are then filled with molten metal to produce, for example, a metallic workpiece, with the sand packs to be filled with molten metal passing through the production line in a row in series production.
- the time required for filling or pouring the liquid metal into a sand packet ultimately determines the cycle time, especially since it must always be ensured that each sand packet is filled with a sufficient amount of metal - through a relatively small pouring opening is. Only after the filling process has ended can the filled sand packet be brought to the next station for further processing.
- the present invention is based on the object to remedy the above problem with regard to the critical cycle time for filling the sand packs with liquid metal.
- a sufficient casting time with reduced cycle time or an extended casting time with constant cycle time should be achievable with simple means.
- a corresponding method is to be specified which results in a reduction in the cycle time during the actual casting of the material.
- a device for applying a pouring pool or funnel consisting of molding material, in particular molding sand, to a molding material or sand package is specified.
- the device according to the invention achieves the above object by the features of patent claim 1.
- the device according to the invention is characterized by a device for shooting, solidifying and direct application of the shot and solidified pouring pool or funnel to the sand packet.
- the process of pouring molten metal into the sand pack always takes an enormous amount of time due to the pouring opening, which is generally only of small diameter. This period of time was previously fixed at the casting station at the casting station, so that the cycle time as a whole was predetermined.
- the time required for casting is decoupled from the actual casting station, namely by a pouring pool around the pouring opening of the sand pack or a kind of funnel is put around.
- This pouring pool or funnel has an enormously large pouring opening and virtually forms a basin for the melt, so that the molten metal can be poured very quickly into the pouring pool surrounding the actual pouring opening of the sand package. From there, the liquid metal passes through the narrower pouring opening and into the interior of the sand pack.
- the sand packet can already be conveyed to the next work station, so that the liquid metal can flow completely into the interior of the sand packet during transport to the next work station.
- the time required to fill the sand packet is no longer critical with regard to the cycle time, and therefore no longer determines the usually very long cycle time per work station.
- the casting pool or funnel which at least indirectly serves to reduce the cycle time, can expediently be produced from the same material as the sand packet itself.
- the casting pool - like the sand packet - can be Produce or shoot a type of core shooter, solidify it and apply it directly to the sand pack after manufacture, so that there is at least one mechanical toothing and thus a high coefficient of friction between the pouring pool and the sand pack, causing slippage of the Pouring pool is effectively avoided when filling with molten metal.
- the pouring basin is a type of funnel with a wall that is approximately circular in shape or closed over corners by means of straight edges.
- the outer geometry of the pouring pool - whether round or square - plays only a minor role.
- the wall of the pouring basin widens in cross-section towards the end associated with the sand pack in such a way that the inner cross-section of the pouring basin tapers and thus has the shape of a funnel, at least in the inner region. This ensures in a particularly suitable manner that the metal poured onto the sand packet and into the pouring basin actually reaches the interior of the sand packet through the pouring opening of the sand packet and fills the interior there completely.
- the liquid metal filled in the pouring pool presses the pouring pool onto the sand pack due to the bevelled inner surfaces, which enormously increases the operational safety of the pouring pool.
- the pouring pool or the like as a kind of elongated riser. works.
- the device for shooting, solidifying and direct application of the pouring basin it is particularly advantageous if it has at least one weft nozzle and a weft kettle which is arranged downstream of the weft nozzle.
- the number of shot nozzles required to produce or shoot the pouring pool depends not least on the shape of the shot nozzles, which will be discussed later.
- the shot shape specifies the shape of the pouring pool to be produced, which is open towards the free end of the shot boiler, ie downwards. Furthermore, a shot and tensioning head and a counter-holding device are provided, so that the shot boiler between the shot and tensioning head and the counter-holding device can be at least largely clamped in a sealing and pressing position.
- the counter-holding device forms the lower limit of the shot shape, so that in the working position it is only possible for the molding material to flow in or shoot in through the shot nozzles.
- the weft nozzle or the weft nozzles is or are formed in a work frame serving as a weft, press and ejection frame.
- the shot nozzles can be designed as perforated nozzles or as slot nozzles, and in the case of the shaping of the shot nozzles as perforated nozzles, several shot nozzles are always required to obtain a pouring pool that is more or less homogeneously shot.
- the working frame which has the firing nozzle or firing nozzles is arranged so as to be displaceable in the axial direction in a sealing manner on the inner wall of the firing kettle, preferably in the region of the end facing the counter-holding device. Consequently, the casting pool can additionally be pressed or recalibrated after shooting through the work frame and, after being lifted off the counter-holding device, ejected from the shot mold or pressed onto the sand packet.
- the work frame can now effectively perform the tasks intended for it, it is further advantageously operatively connected to a driver plate which extends in the middle approximately transversely to the direction of movement of the work frame.
- the working frame can now be moved axially on the driver plate, on the one hand, for pressing, on the other hand, for ejecting the pouring pool and for pressing onto the sand package.
- the working frame is arranged between the inner wall of the shot bowl and the outer wall of an inner block arranged approximately in the center of the shooting bowl in a sealing, displaceable manner.
- the driver plate protrudes through the cylinder in the sense of a piston and the working frame is dimensioned and displaceably arranged such that it or its seals directed towards the outer wall of the inner block always seal the passage of the driver plate through the inner block.
- the driver plate can be moved up or down in the sense of a piston, depending on the application of the cylinder in question, which in turn opens the working frame for pressing or compacting the pouring pool or for pushing out or pressing on the pouring pool the sand packet can be acted upon.
- the weft and clamping head it is particularly advantageous if it has a weft air connection and a weft air filter, the weft air filter being used in particular to filter the air that may flow back after the shooting.
- the shot air filter effectively prevents the back flow of molding sand into the units of the device which produce compressed air.
- the shot and tensioning head can be moved vertically, in particular with regard to a smooth process sequence, via an upper tensioning cylinder, so that it can be placed automatically on the shot boiler for firing the pouring pool.
- the counter-holding device has a lower pressure plate which can be moved vertically by a lower tensioning cylinder, this pressure plate closing the protective form at the bottom during the shooting of the pouring basin.
- the pressure plate is moved downward over the tensioning cylinder and the shot and tensioning head is lifted off the shot boiler, so that it moves out of the area between the shot and tensioning head and the counter-holding device the shot and press position tion, can be swung out.
- the friction between the shot and pressed pouring pool and the inner wall of the shot form is sufficient that the pouring pool cannot slip out of the shot form or fall out.
- At least one additional shot boiler is provided.
- two shot boilers are provided for this.
- the shot kettles can be moved alternately from the shot and press position between the shot and clamping head into an ejection and possibly refill position between the sand packet and possibly a sand bunker, the sand packet being located below the shot boiler to be positioned there and the sand bunker is located above the shot boiler.
- the rotating device in question further advantageously has a swivel arm holding the shot boiler, which is preferably articulated vertically and rotatably about a machine frame about a column and a cylinder-piston arrangement approximately centrally between the shot boilers.
- the vertical movement of the shot kettle basically serves to optimally apply the pouring pool to the sand package. While the compacted pouring pool is pressed out of the shot mold by the movement of the working frame and pressed onto the sand packet, the entire shot boiler is lifted off the sand packet to avoid crushing or destruction of the pouring pool, so that the movements of the working frame and the Compensate the shot boiler to a certain extent to avoid excessive pressure on the casting pool or even on the sand packet.
- the shot and press position and the ejection and possibly refill position are diametrically opposed to one another. Consequently, it is correspondingly advantageous if the rotating device can be rotated through approximately 180 °, so that the shot boilers, which are then also diametrically opposite one another, can be brought into the two working positions by pivoting the rotating device.
- the horizontal position of the rotating device as a whole could be changed, as a result of which the shot boiler can in turn be adjusted in height.
- the swivel arm of the rotating device could preferably be rotatably or pivotably articulated on the shot boiler via a cylinder-piston arrangement, so that the shot boiler is vertically adjustable, in particular when the casting pool is put down or pressed on. Consequently, the height of the shot boiler could be adjusted both via the cylinder-piston arrangement between the swivel arm or column and the machine frame and also via the cylinder-piston arrangement between the swivel arm and the shot boiler.
- an upper crossbar of the machine frame could hold an automatic displacement axis of the cylinder-piston arrangement or of the column carrying the swivel arm.
- the ejection position of the shot boiler could be matched exactly to the pouring opening of any sand packets or adjusted to its position.
- different sand packets could be provided with casting pools without having to carry out a cumbersome retooling of the device.
- the automatic displacement axis would in any case have to be fed with the position of the sand packet or with parameters relating to its geometry.
- a method for applying a pouring pool or funnel consisting of molding material, in particular molding sand, to a molding material or sand package is specified using a device according to the above-mentioned configurations.
- the method according to the invention has the following method steps: First of all, the pouring pool or funnel is shot. Then the pouring pool solidifies in the shooting mold. The shot and solidified casting pool is then applied directly to the sand packet.
- the casting pool is solidified mechanically, namely by uniaxial pressing or recalibration.
- a binding substance could also be added, as is usually the case in the manufacture of foundry cores.
- the shooting and solidification take place in a firing and pressing position and the ejection and application to the sand packet in an ejection position.
- the pouring pool In the ejection position, the pouring pool is ejected and at the same time pressed onto the sand packet by the ejection force, so that at least mechanical interlocking takes place.
- the shot boiler is raised together with the shot form from the sand packet, so that destruction on the one hand of the pouring pool and on the other hand of the sand packet to be provided with the pouring pool is effectively avoided.
- the pouring openings provided in the sand packs are detectable and the shot boiler according to the position the pouring openings can be positioned exactly in its ejection position, so that even the most varied sand packs can be provided with pouring pools in succession without having to retrofit the device according to the invention. This also significantly reduces the total machining or manufacturing time.
- the pouring openings can be detected via control parameters when pressing or conveying the sand packs on the basis of the dimensions of the sand packs and the individual position of the pouring opening in the sand pack.
- the second firing barrel in the ejecting and refilling position roughly simultaneously the casting pool ejects, thereby pressing on the sand package and, if necessary, being refilled with molding material.
- the cycle time specified on the one hand in the firing and pressing position and on the other hand in the ejecting and refilling position is less than 10 seconds.
- FIG. 1 is a side view, schematically, of an embodiment of a device according to the invention for applying a pouring door strip made of molding sand to a sand packet, a total of two shot boilers being provided,
- FIG. 2 in a schematic representation, enlarged and partially cut, the object from FIG. 1,
- FIG. 3 in a schematic representation, enlarged and sectioned, the interior of a shot boiler in the view chosen in Figures 1 and 2 and
- the figures together show a device for applying a pouring pool 1 consisting of molding sand to a sand packet 2.
- the device has a device for shooting, solidifying and direct application of the shot and consolidated pouring pool 1 'to the sand packet 2.
- the casting pool 1 selected here has an approximately rectangular shape, the straight edges of the casting pool being closed at corners to form a circumferential wall.
- the wall of the pouring basin 1 is widened in cross section towards the end associated with the sand packet 2, so that the pouring basin 1 tapers in the free inner cross section.
- 2, 3 and 4 show particularly clearly that the device for firing, solidifying and direct application of the pouring basin has a firing bowl 5 which has a firing nozzle 3 and a firing mold 4 arranged downstream of the firing nozzle 3.
- a shot and clamping head 6 and a holding device 7 are provided. As shown in FIGS. 1 and 2, the shot boiler 5 is clamped between the shot and clamping head 6 and the counter-holding device 7 in a largely sealing and pressing position, the counter-holding device 7 forming the lower limit of the weft shape 4.
- the shot nozzle 3 is formed in a work frame 8 serving as a shot, press and ejection frame.
- the shot nozzle 3 is designed here as a circumferential slot nozzle.
- the working frame 8, which has the firing nozzle 3, is arranged such that it can be moved in the axial direction in a sealing manner on the inner wall 9 of the firing kettle 5, specifically in the region of the end facing the counter-holding device 7.
- the working frame 8 which has the firing nozzle 3 is operatively connected to a driving plate 10 which extends approximately centrally in the transverse direction of the movement of the working frame 8.
- the working frame 8 is axially displaceable via the driver plate for pressing and subsequently ejecting the pouring basin 1 and for pressing the pouring basin 1 onto the sand packet 2 and between the inner wall 9 of the shot boiler 5 and the outer wall 11 of an inner block 12 arranged approximately centrally in the shot boiler 5 arranged displaceably.
- FIG. 2 it is indicated that the shot and tensioning head 6 has a shot air connection 16 and a shot air filter 17 for filtering the air possibly flowing back after shooting. Furthermore, FIGS. 1 and 2 show together that the shot and clamping head 6 can be moved vertically via an upper clamping cylinder 18.
- the counter-holding device 7 shown in FIGS. 1 and 2 comprises a lower pressure plate 20 which can be moved vertically by a lower clamping cylinder 19 and which closes off the weft shape 4 at the bottom.
- a second, identical shot boiler 5 is provided. Both shot boilers 5 can be moved alternately from the shot and press position between the shot and clamping head 6 into an ejection and possibly refill positions between the sand packet 2 and a sand bunker 22 by means of a rotating device 21.
- the sand bunker 22 can in turn be closed by an annular flap 23, so that metering can take place via its degree of opening or the sand bunker 22 can be closed completely.
- the shot boiler 5 is equipped with a level probe 24, which indicates that the shot barrel 5 is adequately filled with molding sand, so that when the level specified by the level probe 24 is reached, the annular flap 23 of the sand bunker 22 closes.
- the previously mentioned rotating device 21 has, as shown in FIG. 1, a swing arm 25 holding the shot boiler 5, which is approximately vertically centered between the shot tanks 5 via a column 26 and a cylinder-piston arrangement 27 on a machine frame 28 and is pivotally articulated.
- the shot and press position as well as the ejection and refill position of the shot boiler 5 are diametrically opposite one another.
- the rotating device 21 can be rotated through 180 °. Furthermore, the rotating device 21 as a whole and the shot boilers 5 can thus be changed in their horizontal position.
- the swivel arm 25 is rotatably and pivotably articulated to the firing bowl 5 via a cylinder-piston arrangement 29, so that the firing bowl 5 is vertically adjustable, in particular when the pouring basin 1 is put down or pressed on.
- An upper crossbar 30 of the machine frame 28 holds an automatic displacement axis 31 of the cylinder-piston arrangement 27 or column 26.
- the machine frame 28 is designed as a machine frame and both the sand bunker 22 and the counter-holding device 7 are on the machine frame 28 articulated.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Casting Devices For Molds (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19924225577 DE4225577C2 (de) | 1992-08-03 | 1992-08-03 | Vorrichtung zum Aufbringen eines Gießtümpels auf ein Sandpaket |
DE4225577 | 1992-08-03 | ||
PCT/DE1993/000590 WO1994003293A1 (de) | 1992-08-03 | 1993-07-06 | Vorrichtung und verfahren zum aufbringen eines giesstümpels auf ein sandpaket |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0652812A1 true EP0652812A1 (de) | 1995-05-17 |
EP0652812B1 EP0652812B1 (de) | 1996-04-17 |
Family
ID=6464713
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP93912649A Expired - Lifetime EP0652812B1 (de) | 1992-08-03 | 1993-07-06 | Vorrichtung und verfahren zum aufbringen eines giesstümpels auf ein sandpaket |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP0652812B1 (de) |
JP (1) | JP2700952B2 (de) |
CA (1) | CA2141687A1 (de) |
DE (2) | DE4225577C2 (de) |
DK (1) | DK0652812T3 (de) |
ES (1) | ES2086943T3 (de) |
WO (1) | WO1994003293A1 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ES2839284T3 (es) * | 2016-07-19 | 2021-07-05 | Loramendi S Coop | Máquina de fabricación de machos de arena |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2198498A (en) * | 1938-06-11 | 1940-04-23 | Castings Patent Corp | Apparatus for forming sprue tube sockets |
DE2304564A1 (de) * | 1973-01-31 | 1974-08-08 | Cobomat Apparatebau Gmbh | Vorrichtung zur automatischen herstellung von formen und kernen fuer giessereizwecke |
-
1992
- 1992-08-03 DE DE19924225577 patent/DE4225577C2/de not_active Expired - Fee Related
-
1993
- 1993-07-06 CA CA 2141687 patent/CA2141687A1/en not_active Abandoned
- 1993-07-06 JP JP6504875A patent/JP2700952B2/ja not_active Expired - Lifetime
- 1993-07-06 DK DK93912649T patent/DK0652812T3/da active
- 1993-07-06 WO PCT/DE1993/000590 patent/WO1994003293A1/de active IP Right Grant
- 1993-07-06 ES ES93912649T patent/ES2086943T3/es not_active Expired - Lifetime
- 1993-07-06 DE DE59302287T patent/DE59302287D1/de not_active Expired - Fee Related
- 1993-07-06 EP EP93912649A patent/EP0652812B1/de not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO9403293A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE4225577A1 (de) | 1994-02-10 |
CA2141687A1 (en) | 1994-02-17 |
DK0652812T3 (da) | 1996-05-13 |
WO1994003293A1 (de) | 1994-02-17 |
ES2086943T3 (es) | 1996-07-01 |
DE4225577C2 (de) | 1998-11-19 |
EP0652812B1 (de) | 1996-04-17 |
JPH07506054A (ja) | 1995-07-06 |
DE59302287D1 (de) | 1996-05-23 |
JP2700952B2 (ja) | 1998-01-21 |
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