EP0884151A1 - Device for casting under pressure ceramic articles - Google Patents

Abstract

Two molded part carriages (22) can be moved along the longitudinal guide (20) on a frame (10) which has two stands (12) and an intermediate longitudinal guide (20). The system includes four clamping bodies (24), each on a molding carriage (22) or stand (12), for one of four mold side parts (26, 28), which can be clamped in pairs to form molds (30). One of the clamping bodies (24) is arranged on each of the two stands (12), and each molded part carriage (22) carries a clamping body (24) only on its side facing the adjacent stand (12). The system also includes a clamping device (40), which can be moved back and forth between a working position for clamping the side moldings (26, 28) and a rest position that allows them to be pulled apart, transversely to the longitudinal guide (20). In its working position, the tensioning device (40) is arranged to float between the two molded part carriages (22) in the direction of the longitudinal guide (20). Finally, the system includes a displacement device (50) with its own drive (54) for evenly pulling apart and pushing together the mold side parts (26, 28). <IMAGE>

Description

The invention relates to a system according to the preamble of Claim 1 for die casting ceramic, in particular sanitary ceramic Items such as toilet bowls, bidets, sinks and the like.

In a known system of this type (DE 195 20 234 C1) is a clamping body for a on a stand of the frame Molded side panel attached while on the opposite Side of the other stand a support plate for the clamping device is attached. Carries from the two molding cars one on each of its two sides, each facing a stand a clamping body for a molded side part. The second molding car carries only one clamping body for a molded side part and, averted from this, a support plate, that of the second Stand attached opposite. The jig, one hydraulic piston-cylinder unit, is in its working position arranged between these two support plates, is supported on the second stand, while the two molded part carriages as well as a total of four molded side parts clamps together, the first stator the reaction force occurring records. Both molds are lower and an upper core is assigned that is perpendicular from below or above forth into cavities between the mold side parts. In the case of the casting mold that deals with one of its side moldings supported on the first stand, this is not a problem since one correct position assignment of the cores to the mold side parts of these Casting mold only depends on their own manufacturing tolerances. However, the location of the mold side parts of the second mold depends in addition to their own manufacturing tolerances from the corresponding ones Tolerances of the first mold. A correct one Interaction of the cores of the second mold with their mold side parts therefore requires that all mold side parts with particularly small, measured in the direction of the longitudinal guide Tolerances have been established, these narrow tolerances themselves do not change significantly during their entire lifespan and also the frame itself under load and temperature fluctuations not deformed. In practice, these conditions can be met insufficiently fulfilled; therefore it is often necessary readjust the cores belonging to the second mold.

The invention has for its object a system for Die casting ceramic, especially sanitary ceramic Articles to be designed in such a way that the need for a such readjustment is largely avoided.

The object is according to the invention with the features of the claim 1 solved. Advantageous further developments result from the Subclaims.

Fig. 1

eine Seitenansicht einer Anlage zum Druckgießen von WC-Becken,

Fig. 2

einen Teil der in Fig. 1 dargestellten Anlage, in vergrößerter Seitenansicht,

Fig. 3

den waagerechten Schnitt III-III in Fig. 2,

Fig. 4a

einen vergrößerten Auschnitt aus Fig. 4,

Fig. 4b

den gleichen Ausschnitt in einer anderen Betriebsstellung,

Fig. 5a

die Teil-Seitenansicht in Richtung des Pfeils V in Fig. 3 und

Fig. 5b

die entsprechende Teil-Seitenansicht in einer anderen Betriebsstellung.

An embodiment of the invention is explained below with the aid of schematic drawings with further details. Show it:

Fig. 1

a side view of a system for die casting toilet bowls,

Fig. 2

part of the system shown in Fig. 1, in an enlarged side view,

Fig. 3

the horizontal section III-III in Fig. 2,

Fig. 4a

3 shows an enlarged detail from FIG. 4,

Fig. 4b

the same section in a different operating position,

Fig. 5a

the partial side view in the direction of arrow V in Fig. 3 and

Fig. 5b

the corresponding partial side view in a different operating position.

The system shown in Fig. 1 is made up of three identical modules composed, each having a frame 10. Each Frame 10 consists of two stands 12, two lower side members 14 and two upper side members 16, the left and the right frame 10 each a stand 12 with the middle Have rack 10 in common. The side members 14 and 16 are on both ends with the associated stands 12 through Screws 18 connected so that the entire system if necessary easily extended by one or more frames 10 or also can be shortened. In the illustrated embodiment the system for die-casting sanitary ceramic article A in shape down-to-earth toilet bowl - s. 5a and 5b - equipped.

The frames 10 have a common longitudinal direction B and each have a longitudinal guide 20 in their central region, that in the example shown from two to the longitudinal direction B parallel rails exist. There are two on the longitudinal guide 20 Molding car 22 arranged one behind the other and in opposite directions Movable in the longitudinal direction B. The two molding car 22 can equipped with rollers or sledge-like on the longitudinal guide 20 be slidable and wear on their facing away from each other Pages each a clamping body 24. On the facing each other Sides of the two to one and the same frame 10 The respective stand 12 is also a clamping body 24 attached. The clamping body 24 are each one for fastening Molded side part 26 and 28 formed, respectively, on the in Fig. 3rd left stand 12 a left side mold part 26, on the right Stand 12 a right side molding 28, on the left molding car 22 another right side mold part 28 and on the right Molding car 22 attached another left side mold part 26 is, so that each a left side mold part 26 with a right mold side part 28 can be combined into a mold 30.

Each frame 10 is therefore provided for a total of two molds 30. In the example shown, each mold has 30 a lower core 32 and an upper core 34, each by means of one Lifting device 36 or 38 along one of the associated stands 12 adjacent vertical lifting axis C can be raised and lowered, in normal operation, after setting up the molds 30, however are not movable in the longitudinal direction B.

According to FIG. 1 and 2 arrange a clamping device 40, which in the example shown with a hydraulic piston-cylinder unit cylinder open on one side and a piston guided therein is formed. The cylinder of the jig 40 is on two Guide bodies 42 guided in the longitudinal direction B and by a spring arrangement 43 in a central position with respect kept on this guide body. The two guide bodies 42 are adjustable in their height on a yoke 44, guided by means of vertical guide rods 46 on the frame 10 and is suspended from a height adjustment device 48. The clamping device 40 takes a working position according to FIGS. 1 and 2 a, in its longitudinal axis B aligned with the common axis of the clamping body 24.

The system for die casting, as far as described so far, works as follows:
In its working position shown in FIGS. 1 and 2, the clamping device 40 is placed under hydraulic pressure, so that it forces the two adjacent clamping bodies 24, which are fastened to one of the two molding carriages 22, with the result that the two casting molds 30 are firmly closed without the left mold side part 26 of the left mold or the right mold side part 28 of the right mold moving in the slightest. The mold parting planes of the two casting molds 30 therefore maintain their position, regardless of the dimensional tolerances of the clamping bodies 24 and side mold parts 26 and 28 measured in the longitudinal direction B, provided that the tensile forces caused by the pressure of the clamping device 40 cause elongations of these carriers to be measured in the longitudinal beams 14 and 16, they remain harmless for the position assignment of the cores 32 and 34 to the respectively associated casting mold 30, since each of these cores is arranged close to the adjacent stand 12 via the associated lifting device 36 or 38, which also determines the position of the associated mold side part 26 or 28. An elongation of the longitudinal beams 14 and 16 therefore takes place, if at all, essentially in the area between the lifting devices 36 and 38, respectively, and thus has no influence on the position assignment of the cores 32 and 34 to their casting mold 30. The same applies to thermal expansion of the longitudinal beams 14 and 16, which can reach the order of magnitude of several millimeters in unfavorable cases. As far as can be seen, such influences have so far been neglected - wrongly - in the design of systems for die-casting ceramic articles.

In contrast, the design described guarantees that that the cores 32 and 34, provided that they are properly adjusted by simply extending the respective associated Lifting device 36 and 38 very precisely in their intended position get inside the associated mold 30. If it must be expected that the tensioner 40 exerted clamping force the mold side parts 26 and 28 noteworthy deformed, the lifting devices 36 and 38, each wear one of the cores 32 and 34, parallel to the longitudinal direction B floating on the frame 10 and supported by spring assemblies normally be held in a middle position. Alternatively can the cores 32 and 34 with respect to their lifting device 36th and 38 arranged in the longitudinal direction B floating and also be centered by a spring arrangement.

The die casting then takes place in the usual way, by the mold cavities of the molds 30 with ceramic Slurry filled and after a certain service life of excess slip can be emptied. After another The service life of the cores 32 and 34 from the casting molds 30 pulled out; the tensioning device 40 is depressurized and with the height adjustment device 48 from that in FIGS. 1 and 2 pictured working position in a rest position between the upper side members 16 raised. Then the molds 30 opened with a sliding device 50, the following is described:

A crankshaft 52 belongs to the displacement device 50 a stationary vertical axis of rotation D rotatably mounted on the frame 10 and from a drive 54, e.g. a hydraulic motor, can be rotated back and forth by approximately 180 °. On the crankshaft 52 a double crank 56 is attached, at the ends of each Connecting rod 58 is articulated. On each of the two molding carriages 22 is a two-armed lever 60 about a vertical pivot axis E. pivoted. These two levers 60 are each with one of the two connecting rods 58 and, opposite this, each with one Bolt 62, articulated. Each of the two bolts 62 extends itself by an annular stop 64 on associated molding carriage 22 and by a helical Compression spring 66 through. Each of the two compression springs 66 is between the associated stop 64 and one on the associated Bolt 62 adjustable head 68, for example a screwed-on nut that is secured against loosening, clamped. This way is on each of the two Molding car 22 a spring force accumulator 70 is formed.

With the system at rest, with the molds 30 open, take the two molding car 22 the position shown in Fig. 4a one in which they are closely adjacent to each other and the two Connecting rods 58 diametrically opposite one another on the crankshaft 52 concerns. To close the molds 30, the crankshaft 52 by approximately 180 ° clockwise - based on Fig. 4a - rotated so that the connecting rods 58 according to a stretched position Fig. 4b arrive, the two molding car 22 so far push away from each other that the two molds 30 almost getting closed. Now between the clamping bodies 24 is the two molding car 22 enough space for the clamping device 40 their previously described and shown in Figs. 1 and 2 Take up work position and be put under pressure can to close the two molds 30 completely. There the two connecting rods 58 are already in their extended position according to FIG. 4b, is that required to close the molds 30 additional movement of the two molding car 22 from each other away possible only because the two compression springs 66 give way and save spring work. At the end of the casting cycle if the Clamping device 40 is depressurized and in its rest position has been withdrawn, causes in the two spring energy stores 70 stored deformation work of the springs 66 that the molding carriage 22 in its position shown in Fig. 4b are retrieved and the two molds 30 are thus slightly be opened so that the molded article A begins can detach from the inner walls of the molds 30 to to be placed on one pallet F.

For handling pallets F together with article A on them removal devices according to FIGS. 3, 5a and 5b are provided. A cross conveyor 72 belongs to each removal device two parallel, horizontally arranged transversely to the longitudinal direction B. endless conveyor belts 74. These are on one in theirs Transversely movable cross slide 76 mounted in the longitudinal direction, which in turn on a longitudinal slide adjustable in the longitudinal direction B. 78 is performed. The longitudinal slide 78 is on one height-adjustable carriage 80 led, which in turn on an in turn adjustable longitudinal carriage B. is led.

To remove the two cast within a frame 10 Article A, the two cross conveyors 72 are in position brought according to Fig. 5b. Then their cross slides 76 together with the pallet F lying on the conveyor belts 74 and on it standing article A transverse to the longitudinal direction B from the frame 10 pushed out and lowered onto a common longitudinal conveyor 84, which is a roller conveyor in the example shown, of which two rollers for each cross conveyor 72 through recesses 86 are replaced so that the two cross conveyors 72 shown in FIG. 5a can be lowered so far that the two pallets F of the conveyor belts 74 are released and on the longitudinal conveyor 84 can be moved.

Claims (3)

System for die casting ceramic articles (A) with a frame (10) which has two stands (12) and an intermediate longitudinal guide (20), two molded part carriages (22) which can be moved along the longitudinal guide (20), four clamping bodies (24), each on a molding carriage (22) or stand (12), for one of four mold side parts (26, 28), which can be clamped in pairs to form molds (30), a tensioning device (40) which can be moved back and forth transversely to the longitudinal guide (20) between a working position for tightening the molded side parts (26, 28) and a rest position which enables them to be pulled apart, and a displacement device (50) with its own drive (54) for evenly pulling apart and pushing together the mold side parts (26, 28),
characterized in that one of the clamping bodies (24) is arranged on each of the two stands (12), each molding carriage (22) carries a clamping body (24) only on its side facing the adjacent stand (12), and the clamping device (40) is arranged in its working position between the two molded part carriages (22) floating in the direction of the longitudinal guide (20). System according to claim 1,
characterized in that the displacement device (50) has an end position in which it has only approximated the molding carriage (22) to a casting position, and between the displacement device (50) and the molded part carriage (22) there are spring force accumulators (70) which, when the molded part carriage (22) is moved by the clamping device (40), stores sufficient energy in their casting position to be able to release the clamping device ( 40) to initiate a return movement of the molding carriage (22). System according to claim 2,
characterized in that the displacement device (50) has a double crank (56) which is mounted in a fixed position between the two molded part carriages (22) with respect to the frame (10), and A lever (60) is mounted on each of the two molded part carriages (22) and is articulated to the double crank (56) via a connecting rod (58).

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