Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
  • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
  • B22D17/20—Accessories: Details
  • B22D17/30—Accessories for supplying molten metal, e.g. in rations
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
  • B22D39/00—Equipment for supplying molten metal in rations

Definitions

• the invention relates to a melt metering device for a pouring device, wherein the melt metering device has an evacuatable metering container which is movable between a melt receiving location and a melt discharge location and is adapted to remove a meterable amount of cast melt material from a melt bath at the melt picking location - Place to transfer the casting device and deliver it there, on a feasible with such a device Schmelzezudos mecanics- method and on a equipped with such Schmelzezudosiervornchtung casting machine.
• Such devices and methods come e.g. in metal die casting machines for metering the molten metal to be cast used.
• Melt-metering devices are known in which casting melt material is absorbed by immersing a pouring ladle into a melt bath, which is subsequently transferred to a melt discharge location or pouring location in order to melt the melt.
• the bucket can be manually operated or coupled to a mechanical transfer unit that actuates it. During transfer, the surface of the melt received in the bucket is exposed to atmospheric air.
• melt metering systems are in use in which the melt material is conveyed by a mechanical pump or by pneumatic displacement from the melt bath of a melting furnace into a downwardly inclined transfer pipe in which it flows to the melt discharge location.
• melt metering devices of the type mentioned are known. These include an evacuated dosing with associated Evakuier experiences.
• JP 2000-218360 A discloses a melt metering device of this type, in which the melt opening is formed by a pipe socket which extends from the bottom region of the metering container both inwardly and outwardly.
• the inwardly facing pipe socket half is covered by a hood-shaped Stirnendab gleich a hollow tube, which is arranged longitudinally in the metering and is connected to an inert gas source.
• An immersion sensor is arranged on the outside of the container, with which the lowering of the container into the melt bath is monitored until a predefinable immersion position is reached.
• a weight sensor By means of a weight sensor, the amount of melted material sucked into the dosing tank is monitored.
• a filling level sensor conventionally provided in the container can be dispensed with.
• melt opening of the type with evacuatable metering container is disclosed, the melt opening of which is likewise formed by a pipe stub which extends from the container bottom both inwardly and outwardly.
• the inwardly projecting pipe socket half is covered by a hood-shaped front end of an axially movable locking rod.
• the closure rod By moving back and forth, the closure rod can be moved between an opening position releasing the melt opening and a closed position closing the melt opening at the upper, inner end of the pipe socket.
• a fill level sensor arranged in the container detects whether melt material sucked into the container has reached a predefinable fill level.
• the container interior can optionally be evacuated or charged with an inert gas.
• the inwardly pointing pipe socket half of the melt opening impedes or prevents a complete emptying of the container at the melt discharge point, even if the container is held obliquely there as described there.
• the invention is based on the technical problem of providing a Schmelzezudosiervorraum of the type mentioned above and a feasible by this Schmelzezudosiervons and equipped with this casting machine with which the casting melt material can be metered from a molten bath in an advantageous manner and transferred to a delivery point, where unwanted Oxidation effects of the transferred melt material and / or undesirable melt losses in Dosier employertransport from the melt receiving point to the melt discharge point wholly or at least largely avoided.
• the invention solves this problem by providing a melt metering device having the features of claim 1, a melt metering method having the features of claim 9 and a casting machine having the features of claim 15.
• Advantageous developments of the invention are specified in the subclaims.
• the melt metering device has an evacuatable metering container and an evacuation device for evacuating the metering container.
• an evacuation device for evacuating the metering container.
• the melt metering device comprises a controllable closure means for selectively opening and closing a melt opening of the metering container, which closes the melt opening of the metering container in its closed position leaving a capillary opening, and / or a special weight sensor which is adapted to the weight of the empty metering container during Lowering in the melt bath to the achievement of a predetermined immersion position of the dosing to monitor.
• a requirement for the evacuatable metering container often consists in that, as far as possible, no melt material is removed from the container during the transport from the melt receiving location to the melt discharge location. - - dripping or leaking out of it.
• melt material which remains in the area of the melt opening after the metering container has been lifted out of the melt bath can be reliably and reliably held on and in the container by the sustained evacuation of the container interior and the underpressure or suction thus also acting in the area of the capillary opening. without dripping down or licking away from it.
• the dosing can be safely and reliably brought into its predefinable immersion position for receiving melt material from the melt, without the need for a separate immersion sensor is required.
• the weight sensor uses the effect of measurably reducing the weight of the empty dosing container when it is immersed in the melt bath due to the resulting buoyancy force. This effect is the more pronounced the lighter the dosing tank. In addition, this effect can be influenced by the design of the dosing in the submerged lower area.
• the capillary opening is formed by a Kapillarringspalt between an inner edge of the melt opening and an outer edge of the closure means or by at least one Kapillarspaltrille which is provided on the inner edge of the melt opening or on the outer edge of the closure means.
• the melt opening is provided in a bottom region of the dosing container
• the controllable closure means includes a longitudinally movably arranged in the dosing container sealing plug.
• the melt opening can be e.g. be provided at a lowest point of the container bottom.
• the melt opening is formed by a projecting from the bottom region of the dosing outwardly tubular socket area. The dosing then need not be immersed in its entire width of the bottom portion, but only with its nozzle portion in the melt bath to suck melt into the dosing.
• the nozzle area can be realized with a comparatively small diameter, whereby tear effects of the melt surface layer of the melt bath can be kept to a minimum.
• the melt metering device has a controllable protective gas loading means, by means of which the metering container can be subjected to a conventional protective gas in a controllable manner, as is customary for a protective gas atmosphere in a melting furnace above the melt bath, for example.
• the inert gas fulfills its usual protective gas function for the melt material in the dosing tank and can also be used in the event of overpressure. - - support the discharge of the melt from the dosing tank at the melt discharge point.
• the evacuation device includes a vacuum pump or a controlled confirmed piston-cylinder unit. Both alternatives enable the desired evacuation of the dosing with relatively little effort.
• the weight sensor is set up to detect the weight of the filled dosing container during its movement from the melt receiving location to the melt discharge location, and in this way to detect any melt loss.
• the weight sensor is set up to detect the weight of the dosing container during the melt discharge process, in order to be able to detect whether or when the container is completely emptied.
• the process according to the invention is carried out with the melt metering device according to the invention.
• the dosing container is lowered into the melt bath until the predefinable immersion position detected via the weight sensor is reached and the melt opening closure means is controlled into an open position for receiving melt material from the melt bath.
• An optional protective gas supply can be deactivated and the evacuation device is activated. As a result, melt material is sucked into the dosing tank and, if appropriate, the protective gas is withdrawn from the dosing tank.
• the absorption of melt material from the melt bath into the metering container takes place after a predefinable period of time or when a predefinable melt fill quantity in the metering container, which is e.g. can be detected by the weight sensor, finished, wherein the melt-opening-closing means of the metering container is controlled in a closed position.
• the evacuation device is kept activated after completion of picking up melt material from the melt bath into the metering container with the melt opening closure means held closed until a melt discharge process begins. This allows degassing of the melt received in the metering container during its transport to the delivery location.
• the capillary remains with closed melt opening
• the retained evacuation of the dosing in combination with the capillary also the melt is securely held on or in the container, causing an unintentional loss of melt on the Transport route from the location to the place of delivery prevents.
• the melt-opening closure means is controlled to an open position for dispensing melt material from the metering container, and the protective gas is activated.
• the melted material can be rapidly discharged from the dosing tank with inert gas pressure and possibly by gravity.
• the weight of the dosing container is moved from the melt receiving location to the melt discharge point. It is monitored for any loss of melt and / or for a complete discharge in the melt discharge process, for which purpose in particular the weight sensor present in the corresponding embodiments of the invention can be used.
• a die casting machine according to the invention is equipped with the melt metering device according to the invention.
• This may in particular be a metal diecasting machine wherein the processed metal material is e.g. Aluminum, magnesium or zinc can be.
• FIG. 1 is a schematic view of a Schmelzezudosiervorraum with an evacuated dosing in longitudinal section and with a vacuum pump as Evakuier Anlagen
• Fig. 2 is a representation corresponding to FIG. 1 for a variant of
• Fig. 4 is a schematic flow diagram of one shown in Figs.
• 1 is a sectional view of a lower part of the metering container of FIG. 1 or 2 in a position for sucking in melt material, a view according to FIG. 4, but with the metering container in a transfer position between the melt receiving location and the melt discharge location, a view corresponding to FIG. 4;
• a schematic longitudinal sectional view of another Schmelzezudosiervortechnik invention containing a weight sensor a view corresponding to FIG. 8 with the Schmelzezudosiervortechnisch when lowered into a melt bath, a view corresponding to FIG.
• the melt metering device shown in FIG. 1 includes, as melt receiving means, an evacuatable metering container 1 with a substantially cylindrical container pot 1 a and a lid 1 b, which is placed on the top cover of the container pot 1 a and detachably connected thereto.
• the container pot 1 a on its upper side an outwardly projecting annular flange 1 c on which the lid 1 b, for. is fastened by means not shown screwed, with a ring seal 2 between the pot flange 1 c and the cover 1 b is inserted.
• On the cover 1 b is an upwardly projecting flange 3 is formed with a suspension opening 3a, through which the dosing 1 can be mounted pivotably on a transfer unit.
• the container pot 1 a is in a bottom portion 1 d funnel-shaped with a sloping bottom funnel section, from the down a tubular nozzle portion 1 e protrudes, which forms a melt opening 4 of the container 1, introduced via the melt material into the container 1 and discharged again from this can be.
• the melt opening 4 is associated with a controllable closure means which includes a parallel to the longitudinal axis of the container pot 1 a longitudinally movable in the dosing container 1 arranged sealing plug 5.
• a controllable closure means which includes a parallel to the longitudinal axis of the container pot 1 a longitudinally movable in the dosing container 1 arranged sealing plug 5.
• the closing plug 5 can be selectively brought into a closed position or an open position, wherein FIG. 1 shows the closing plug 5 in its open position opening the melt 4.
• a corresponding linear drive 6 which is attached to the container lid 1 b.
• the dosing 1 is associated with an Evakuier Nureau, which includes a vacuum pump 7 in the example of FIG.
• the dosing container 1 is associated with a protective gas supply means, which includes a protective gas source 9, which is coupled via a protective gas line 10 to the combined vacuum / protective gas line 8.
• a protective gas supply means which includes a protective gas source 9, which is coupled via a protective gas line 10 to the combined vacuum / protective gas line 8.
• an optional manual shut-off valve 1 1 and a controllable solenoid valve 12 is provided in the inert gas 10.
• an inner space 14 of the dosing container 1 can optionally be evacuated or mixed with a conventional protective gas, e.g. a nitrogen gas, are applied.
• a section 8a of the combined vacuum / shield gas line 8 is designed as a flexible line section, e.g.
• the dosing container 1 in the form of a corresponding piece of tubing, realized in such a way that the dosing container 1 remains movable to a corresponding extent with respect to the vacuum pump 7 and the protective gas source 9.
• the metering container 1 can thus unimpeded from its coupling to the vacuum pump 7 and the protective gas source 9 perform the desired melt transport movement, even if the vacuum pump 7 and the inert gas source 9 are arranged stationary.
• the metering container 1 further has a melt level sensor 13 for detecting the melt level in the container 1.
• the level sensor 13 is formed as a measuring rod of known type, which is fixed to the container lid 1 b and from there down into the container interior 14 extends.
• the melt level sensor 13 continuously detects the level of melt material in the container 1 or detects when the melt level has reached or exceeded a certain threshold.
• the dosing tank 1 is a melt bath immersion sensor
• the senor 15 is arranged, with which it can be detected whether and / or how deep the container 1 is immersed in a molten bath of a melting furnace for receiving melt material.
• the sensor 15 is formed by a measuring rod known per se for this purpose, which is fixed at the outer edge of the container lid 1 b outside of the container pot 1a pointing downwards. He extends with its probe part at least down to the level of the pot bottom portion 1 d and the tubular inlet / outlet 1 e e. Thereby, he can detect the immersion of the inlet / outlet nozzle 1 e in the melt bath.
• Fig. 2 shows a variant of the device of Fig. 1, which differs from this only in the realization of Evakuier Anlagen.
• the same reference numerals are used for identical or functionally equivalent components, and it can be made to the extent of the above description of FIG. 1 reference.
• the Evakuier shark's beautiful includes a piston-cylinder unit 17 with a cylinder 16, a piston 18 axiallybeweglich in this guided and a piston outgoing from this on one side of the piston rod 19, which on an end face of the cylinder
• Fig. 3 shows a melt metering device of the type of Fig. 1 or 2 in use in a casting device.
• the pouring device is exemplified as a metal die casting machine for casting metal parts e.g. made of aluminum, magnesium or zinc.
• the die casting machine includes in a conventional manner a structure 22 for a mold not shown here with a fixed and a movable mold half, which is actuated by a likewise not shown here closing part, and with a melt supply unit, which in the example shown horizontally arranged casting cylinder 23 with the top of the melt supply port 24 and a casting piston 5 includes.
• the casting piston 5 is arranged axially movable in the casting cylinder 23 between a supply opening 24 for the purpose of melt supply releasing, retracted position, as shown in Fig. 3, and an advanced position, wherein the casting piston 25 by advancing in the advanced end position previously fed into the casting cylinder 23 , Pressed metered amount of molten metal in the previously closed mold.
• the die casting machine includes a melting furnace 26 arranged at a predetermined distance from the casting mold assembly 22.
• the melting furnace 26 is of a type known per se with a crucible 27 for preparing a melt bath 28 of the respective metal material.
• the die casting machine is equipped with a Schmelzezudosiervorraum in the manner of Fig. 1 or 2, in order for the respective casting a predetermined, metered amount of molten metal melt bath - -
• the melt metering device takes 28 to transfer to the supply port 24 of the casting cylinder 23 and deliver there into the casting cylinder 23.
• the melt metering device has the metering container 1 and a transfer unit 29, to which the metering container 1 is coupled.
• the transfer unit 29 includes a swivel arm 31 actuated by an associated swivel drive 30, to whose free end the dosing container 1 is articulated via its suspension 3, 3a.
• the pivot arm 31 performs a symbolized with a dashed curve curve 32, approximately semicircular pivotal movement to the dosing 1 between a melt receiving point in the crucible 27, shown by solid lines, and a Schmelzeabgabeort the casting cylinder 23, shown with dashed lines move.
• the articulation of the metering container 1 to the pivot arm 31 is chosen so that the metering container 1 as shown relative to the pivot arm 31 is limited rotatable so that it assumes a vertical position at the Schmelzeabilityort in the crucible 27, at the Schmelzeabgabeort above the casting cylinder 23, however, a like shown occupies slight inclination relative to its vertical position.
• a sprocket mechanism with a chain 33 between a drive-side sprocket 34 at the hinged end of the swivel arm 31 and a container-side sprocket 35 at the container linkage at the free swivel arm end, wherein the sprockets 34, 35 are designed with suitably different numbers of teeth, For example, the drive-side sprocket 34 with a larger number of teeth than the container-side sprocket 35.
• the dosing 1 synchronously performs a pivotal movement between its vertical position at the melt receiving point in the crucible 27 and its inclination at the Schmelzeabgabeort above the casting cylinder 23.
• the transfer unit 29 holds the dosing container 1 in a waiting position, step S1 in FIG. 4, outside the crucible 27 above the melting furnace 26. In this waiting position, the evacuation device 7, 16 to 21 is deactivated. As soon as the execution of a casting operation is requested, the transfer unit 29 lowers the dosing container 1 into the crucible 27 until it is recognized by the dip sensor 15 that the dosing container 1 with its inlet / outlet nozzle 1 e is immersed in the melt bath 28.
• the immersion sensor 15 detects that it has reached with its slightly above the level of the lower edge of the nozzle 1 e sensor element a bath level 28 a of the melt bath 28.
• the corresponding signal of the immersion sensor 15 is used as a control signal, by which the closure plug 5 is controlled in its open position, if he has not already been there in the waiting teposition of the dosing 1, the solenoid valve 9 is closed and the Evakuier worn 7, 16 until 21 is activated.
• the solenoid valve 9 is expediently opened before immersing the metering container 1 in the melt bath 28, so that the container interior 14 is subjected to inert gas.
• step S2 in FIG. 4 a desired, metered amount of melt from the melt bath 28 is received in the dosing tank 1, step S3 in FIG. 4.
• the evacuation device 7, 16 to 21 activated, and by the negative pressure arising in the container interior 14, melt 37 is sucked into the container interior 14 via the inlet / outlet opening 4 released by the closure plug 5, as illustrated in FIG. 5 by melt flow arrows 36.
• the level sensor 13 responds to this and outputs a corresponding signal which terminates the melt receiving process.
• the closure plug 5 is advanced into its closed position closing the opening 4, in which it closes the melt opening 4 while leaving a capillary opening 4a, as indicated in FIG.
• the closure plug 5 does not completely close the melt opening 4 in the closed position, but the capillary opening 4a remains between an inner edge 1 e 'of the inlet / outlet nozzle 1 e and an outer edge 5 a of the sealing plug 5.
• the metering of the amount of melt to be received in the container 1 can be effected by setting a predefinable time duration and / or a presettable suction effect of the evacuation device for the melt suction process.
• closing plug 5 can again be controlled into its closed position, and / or the suction power of the evacuation device is activated only for a predefinable period of time with a suction power sufficient to draw melt into container 1.
• the detection signal of the limit switch element 21 can be used to control the sealing plug 5 in its closed position when the piston 18 has reached its center position B.
• the activity of Evakuier worn 7, 16 to 21 is maintained, possibly with a modified suction.
• this can be done, for example, by switching the vacuum pump 7 to a lower suction quantity or suction power.
• the suction action for receiving the melt 37 is effected by moving the piston 18 back from its advanced end position A to the center position B.
• This center position of the piston 18 is detected by the limit switch element 21, the detection signal then switches the associated linear drive 20 for the piston rod 19 to lower speed, substantially simultaneously with the closing movement of the sealing plug 5.
• the piston 18 With its slower movement from the center position B holds in its retracted end position C. the piston 18 then maintains a modified suction.
• melt material is drawn by the suction effect on the capillary 4a and therefore remains adhered to the container 1, without undesirably dripping down.
• the Kapillarifies the Kapillarö réelle 4a is designed to take into account the other influencing parameters, such as shape of the inlet / outlet nozzle, suction pressure and density and viscosity of the melt material and is determined, for example experimentally.
• a melt discharge operation can be carried out, in which the metered amount of melt 37 is filled from the dosing 1 via the supply port 24 with retarded plunger 25 into the casting cylinder 23, see step S5 in Fig. 4.
• the closure plug 5 is again controlled in its retracted open position in which it releases the inlet / outlet port 4.
• Solenoid valve 12 is opened, thereby activating the Schutzgasbeetzschung the container interior again.
• the evacuation effect of the evacuation device is deactivated.
• the latter is achieved in the apparatus of Fig. 1 by switching off the vacuum pump 7.
• the piston 18 In the device of Fig. 2, the piston 18 is held in its retracted end position C. Alternatively, in this case, the piston 18 can be brought back into its advanced position A during the emptying process of the dosing container 1.
• the melt received in the container 1 consequently empties via the inlet / outlet opening 4 and the supply opening 24 from the container 1 into the casting cylinder 23 due to gravity and assisted by the pressurization of the container interior 14 with inert gas under pressure and possibly also by the piston feed movement from its rear end position C in its front end position A.
• Fig. 7 shows a detail of the dosing 1 in this emptying position, symbolized by corresponding Schmelzeausströmpfeile 38.
• the dosing 1 is then ready again to carry out a new melt receiving operation and is by the transfer unit 29 from its emptying position to the waiting position on the furnace 26 or the same pivoted back into its melt receiving position in the crucible 27.
• FIGS. 8 to 14 A further advantageous embodiment of the invention is shown in FIGS. 8 to 14.
• this device has identical or functionally equivalent components as those according to FIGS. 1 to 7, the same reference numerals are used for easier understanding, and reference may be made to the above description of the device according to FIGS. 1 to 7, including their mode of operation and advantages , This also applies, for example, to the leaving of the capillary opening 4a between the inlet / outlet nozzle 1e and the sealing plug 5, when the latter is in its melt opening 4 - - Closing position otherwise closed, as shown in Fig. 8.
• the device of FIGS. 8 to 14 additionally has a weight sensor 40 which is arranged between the linear drive 6 of the closure stopper 5 and a carrier element 41 realized here as a piston-cylinder unit the metering container 1 is coupled in this example to a transfer unit, not shown, which in construction and operation, for example the transfer unit 29 corresponds to FIG. 3.
• the container pot 1 a is held in this example on the container lid 1 b to a housing of the piston-cylinder unit 6.
• the weight sensor 40 which is also referred to as a load cell, conventionally comprises a measuring element for measuring the weight of the coupled metering container 1 together with the piston-cylinder unit 6 and an evaluation part for evaluating the weight force measurement.
• the Sensoraustician can be integrated as required and application with the measuring element in a common sensor housing or otherwise housed as hardware and / or software, e.g. as part of a control unit, not shown here, which performs the various control tasks of the melt metering device.
• characteristic functionalities for the weight sensor 40 are implemented.
• a first functionality of the weight sensor 40 is to transfer the dosing container 1 for receiving melt from the melt bath 28 into a desired, defined aspiration or insertion position 1A, as shown in FIG. 9 corresponding to FIG. 5.
• the dosing container 1 is moved again from the melt discharge point to the melt receiving location after a previous emptying operation, where it is lowered onto the melt bath 28.
• the melt bath 28 exerts a buoyancy-dependent buoyancy force on the container 1, resulting in a corresponding reduction of the weight force measured by the weight sensor 40 leads.
• an optimum immersion position is given, for example, in the position in which the melt bath mirror 28a is located at the upper end of the inlet / outlet nozzle 1e, so that the nozzle 1e is completely immersed in the melt bath 28 during the pot bottom region 1 d widening from there does not dip into the melt bath 28.
• this minimizes disruptions of the melt surface layer and avoids melt adhesions on the container bottom region 1 d outside the nozzle region 1 e.
• the closure plug 5 After reaching the desired immersion position, the closure plug 5 is then returned to its open position, and the evacuation device is activated, as illustrated in FIG. 10 by a plug return arrow 42 and evacuation flow arrows 43. As a result, melt 37 is sucked into the container 1, as illustrated by the melt flow arrows 36.
• the weight sensor 40 monitors the amount of melt 37 sucked into the container 1 during the melt picking process by measuring the container weight. This can be facilitated by zeroing the weight sensor 40 once the immersion position 1 A of the container 1 has been reached is so that he then directly the weight of the sucked into the container 1 melt amount 37 detected.
• the suction process is ended by advancing the closing stopper 5 into its closed position, as shown in FIG. as symbolized by a movement arrow 44, and the dosing container 1 is lifted out of the melt bath 28. Thereafter, the dosing tank 1 is moved from the melt receiving location to the melt discharging location, with the evacuation feed maintained at the same or modified suction power, as explained above for step S4 of FIG.
• FIG. 12 shows in cross-section the capillary opening formed in this case as a circumferentially continuous capillature gap 4ai between the plug outer wall 5a and the socket inner wall 1e '.
• the outer diameter of the sealing plug 5 is selected to be slightly smaller by a corresponding Kapillarvie than the inner diameter of the inlet / outlet nozzle 1 e.
• the optimum capillary width for the desired effect can be selected for the particular application, e.g. be determined empirically.
• FIG. 13 shows an alternative design of the capillary opening 4a in the form of a plurality of circumferentially distributed capillary grooves 4a 2 , which in this example are provided axially extending as grooves on the inner edge of the inlet / outlet nozzle 1e. It is understood that further alternative configurations of the capillary opening 4a are possible. So can Instead of the circumferentially continuous Kapillringepalts 4ai be provided only over a part of the total circumference Kapillarringspalt. In other alternative embodiments, only one capillary groove is provided instead of the capillary grooves 4a2, and / or the at least one capillary groove does not extend exactly axially, but with a component in the circumferential direction.
• one or more capillary grooves are provided on the outer circumference of the closure plug 5 instead of on the inner edge of the nozzle 1 e, or at least one capillary groove is provided both on the closure plug 5 and on the nozzle 1 e.
• the weight sensor 40 monitors the weight of the filled dosing container 1 during its transport from the melt receiving location to the melt discharge location. As a result, any dripping or leaching of the melt 37 received by the container 1 can be detected.
• the emptying process is triggered by, as shown in Fig. 14, the closure plug 5 is moved back to its open position, as symbolized by a movement arrow 45, and the evacuation switched off and on Venting or Schutzgasbeetzwegung is switched on, as symbolized by flow arrows 46.
• the melt 37 thus passes quickly from the container 1 into the casting cylinder 23, as symbolized by the outflow arrows 38.
• the shape of the container 1 and in particular its bottom portion 1 d including the nozzle 1 e allows complete emptying of the container 1 in its shown vertical position above the casting cylinder 23, without having to be tilted to it.
• the weight sensor 40 monitors in a further implemented functionality the complete emptying of the container 1, by the - -
• Container weight monitored during emptying process. As soon as it is detected by the weight sensor 40 that the weight reduction during the emptying process corresponds to the weight increase during the filling process, a complete emptying of the container 1 can be concluded. If required, this monitoring between the intake volume and the quantity of discharged melt can be used as a plausibility check for quality assurance purposes.
• closure plug 5 is preferably moved back into its closed position and the Schutzgasbeaufschlagung can be terminated.
• the lowering of the dosing tank 1 into the molten bath 28 can be monitored by using the weight sensor 40, so that the immersion sensor 15 as used in the embodiment of Figs , can be omitted.
• the lowering of the metering tank 1 into the molten bath 28 may be 1 A monitored using a pressure measurement or controlled in order to achieve the desired dipping position.
• the container 1 is lowered with the closure stopper 5 moved into its open position, while the protective gas loading of the container 1 is kept active.
• the invention provides a very advantageous, novel melt metering device with which melt can be transported in a precisely metered amount without the ingress of air from a melt bath to a melt discharge location.
• the dosing is evacuated.
• the dosing can be kept closed and a negative pressure in the dosing be maintained. This causes, in particular in combination with a capillary opening at the otherwise closed melt opening, that the melt can be held securely on and in the container even in the critical area there.
• the metering container can have a removal nozzle with a very small cross-section relative to a main part of the container, whereby it only needs to be immersed in the melt bath with this inlet connector, which minimizes the effects of dripping on the surface of the melt bath.
• the evacuation of the dosing tank also keeps heat losses low, with additional thermal insulation being provided for the tank walls as needed, e.g. the pot wall and / or the container lid.
• One aspect of the invention also provides specific advantageous implementations for a weight sensor equipped with corresponding melt metering devices.
• the weight sensor is used to monitor the weight of the empty dosing container when lowering into the melt bath, which makes it possible to achieve a desired, optimum dipping / suction position in a simple manner without requiring a separate position sensor, for example in the form of an outside to be arranged on the dosing Schmelzebad- immersion sensor is necessary.
• the weight sensor can be implemented with additional functionalities. Thus, for example, it can monitor the container weight during the transport of the dosing container from the melt receiving location to the melt discharge location, in order to be able to determine whether undesirable melt drips off the container or runs out of it.
• the weight sensor may monitor the container weight during the melt suction process to detect when the desired amount of melt has been sucked into the container to stop the melt picking operation.
• the weight sensor may be used to monitor the container weight during the evacuation process to determine if the container has been completely emptied. It is understood that only a part of these mentioned functions for the weight sensor needs to be implemented as needed.
• FIGS. 1 to 7 show an embodiment according to the invention without a weight sensor, but with a capillary opening
• FIGS. 8 to 14 show an embodiment which has both the weight sensor and the capillary opening.
• the invention also includes embodiments that have only the weight sensor in corresponding implementations, however, not the capillary opening at the otherwise closed melt opening.
• the melt metering device according to the invention can be used not only for the explicitly shown case of metal diecasting machines, but for any other pouring devices in which melt is to be transferred from a spatially remote melt bath to a melt discharge location, for example also in mold casting plants.
• the melt metering device according to the invention is very easily adaptable to existing casting units and furnaces, so that existing installations can easily be retrofitted therewith.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
• Basic Packing Technique (AREA)
• Vacuum Packaging (AREA)
• Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
• Continuous Casting (AREA)
• Casting Or Compression Moulding Of Plastics Or The Like (AREA)
• Manufacture And Refinement Of Metals (AREA)
• Sampling And Sample Adjustment (AREA)

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• 2010
  • 2010-07-14 EP EP10169551A patent/EP2407260A1/de not_active Withdrawn
• 2011
  • 2011-06-22 RU RU2013104052/02A patent/RU2584197C2/ru active
  • 2011-06-22 EP EP16183170.6A patent/EP3117933B1/de active Active
  • 2011-06-22 SI SI201131129A patent/SI2593253T1/sl unknown
  • 2011-06-22 KR KR1020137003586A patent/KR101849287B1/ko active Active
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• 2020
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