EP3595829B1 - Device for shooting a casting core - Google Patents

Description

The invention relates to a device for shooting casting cores which are required for casting cast parts from a metal alloy. Such casting cores are used in the respective casting mold in order to create cavities and other form elements in the casting to be cast.

The casting cores are usually formed from a molding material, which is typically a molding sand-binder mixture, which is introduced ("shot") into the shaping cavity of the core-shooting device with high pressure. The flowability of the molding material, the shooting pressure and the positions at which the molding material is introduced into the mold cavity of the machine provided for the production of the cores are coordinated in such a way that complete mold filling is achieved even with particularly fine-grained cores. After core shooting, the cores are solidified by applying heat or gassing with a reaction gas in such a way that they can be inserted into the respective casting mold and withstand the loads that occur when the respective metal melt is poured.

In particular, the invention relates to a device for shooting a casting core which envelops a free interior space at its outer limits, the device having a mold cavity which depicts the casting core and which runs around an inner slide extending along a longitudinal axis and on its outside one around the mold cavity circumferential outer slide is limited, the clear The width of the mold cavity is determined by the distance between the inner surface of the outer slide assigned to the mold cavity and the outer surface of the inner slide.

Casting cores of the type to be produced with a device according to the invention are thus characterized in that they delimit an interior space in the manner of a hollow cylinder, around which they are guided in a ring shape. The particular challenge in production is that the casting cores are usually not tubes with a solid wall, but that their wall surrounding the interior is often perforated or provided with recesses, and there may also be locally differently sized accumulations of material are connected to each other via finely branched webs, bridges or other filigree shaped elements.

Due to the circumferentially closed, circular or ellipsoidal shape of the casting cores in cross-section, in the case of such finely divided casting cores, demolding especially of the inner slide is only possible with considerable effort. This effort complicates a large-scale, rapidly clocked series production of casting cores of the type in question here.

An example of a device for producing pot-shaped casting cores with simply designed, solid circumferential walls without any opening and an equally simple and solidly designed base is from FIG GB 829,282 known. In this device, an inner slide depicting the inner contour of the casting core and an outer slide depicting the outer contour of the casting core are provided. The inner slide is attached to a cover and has a rotationally symmetrical shape that tapers slightly in the direction of the bottom of the mold or is designed like a dome. To shoot the casting core, the inner slide is lowered in the vertical direction to the space delimited by the outer slide, with its longitudinal axis is aligned coaxially to the center of the longitudinal axis of the outer slide positioned by the outer slide. In this way, the mold cavity forming the casting core is delimited between the outer circumferential wall of the inner slide and the inner circumferential wall of the outer slide and between the bottom outer surface of the inner slide and the bottom inner surface of the outer slide. The outer slide is divided into two outer slide halves in a dividing plane running through the centrally arranged longitudinal axis of the outer slide, which can be moved between a removal position in which they are moved as far apart as possible in the transverse direction to the longitudinal axis and a shooting position in which they are close to one another sit and delimit the mold cavity of the device on its outside. To produce the casting core, the respective molding material is shot into this mold cavity and solidified. To remove the core obtained from the mold, the inner slide is pulled out of the finished casting core in a vertical direction. Then the outer slide halves are moved apart and the finished casting core can be removed. This type of demolding requires that the casting core to be produced does not have any undercuts and has a high degree of dimensional stability.

In addition to the prior art explained above, from JP 2015-044217 A a device with the features mentioned in the preamble of claim 1 is known. Thus, the known device in question is used for shooting a casting core which is annular and envelops a free interior space at its outer limits. At the same time, the device has a mold cavity reproducing the casting core, which runs around an inner slide extending along a longitudinal axis and is delimited on its outside by an outer slide running around the mold cavity. The clear width of the mold cavity is determined by the distance between the inner surface of the outer slide associated with the mold cavity Determined outer surface of the inner slide. Along dividing planes that extend in the longitudinal direction of the inner slide, the inner slide in the known device is divided into eight inner slide segments which are positioned between a removal position in which they are positioned approximated to one another and to the longitudinal axis of the inner slide and in which the between the inner slide and the Outside slide existing inside width of the mold cavity is enlarged, can be adjusted into a shooting position approximated to the outside slide, in which the inside width of the mold cavity corresponds to a target value for the casting core to be shot.

Against the background of the prior art explained above, the task was to create a device which enables the reliable production of cast cores, which are tubular in their basic shape but finely structured in their walls, also on an industrial scale, and which allows large travel ranges of each in the receptacle displaceable inner slide segment, a reduction in the number of wide dividing gaps between the inner slide segments in the firing position, a simple shape of the inner slide segments and an overall simplified assembly of the inner slide.

The invention has achieved this object by the device specified in claim 1.

Advantageous embodiments of the invention are specified in the dependent claims and are explained in detail below, like the general inventive concept.

A device according to the invention for shooting a casting core, which envelops a free interior space at its outer limits, accordingly has a mold cavity which depicts the casting core and which runs around an inner slide extending along a longitudinal axis and on its Outside is bounded by an outer slide running around the mold cavity, the clear width of the mold cavity being determined by the distance between the inner surface of the outer slide assigned to the mold cavity and the outer surface of the inner slide.

The inner slide is divided into at least three inner slide segments along dividing planes which extend in the longitudinal direction of the inner slide, the inner slide segments between a removal position in which they are positioned approximated to one another and to the longitudinal axis of the inner slide and the clearance between the inner slide and the outer slide Width of the mold cavity is enlarged, can be adjusted into a firing position approximated to the outer slide, in which the clear width of the mold cavity corresponds to a target value for the casting core to be fired.

In the device according to the invention, the inner slide is thus divided into three or more segments, which are adjustable between a removal position, in which they are positioned closely adjacent to one another, and a shooting position, in which their outer surfaces adjoin the mold cavity that determines the shape of the casting core to be produced limit its inside. The outer surfaces of the inner slide segments are separated from one another by a gap in the firing position. In practice, however, this proves to be uncritical because in most applications it is possible without any problems to lay the course of the dividing planes between the mutually adjacent inner slide segments and the associated course of the gap in such a way that the shape of the core to be produced remains unaffected. The planes of division basically run in the longitudinal direction of the inner slide. In other words, the inner slide segments are divided longitudinally and not transversely to the longitudinal direction of the inner slide. Of course, this does not preclude the Dividing planes also run in sections in the transverse direction of the longitudinal direction in order, for example, to form projecting or recessed shoulders on the inner slide segments in the circumferential direction of the inner slide. It is crucial that the inner slide segments can be moved towards one another by a movement directed in the direction of the central longitudinal axis of the inner slide and apart by a movement directed away from the central longitudinal axis.

In this way, the width of the mold cavity, which depicts the core to be fired, for removing the core can also be expanded in the area of its inner side assigned to the inner slide so that there is no longer any contact between the inner slide segments and the core and the core after removal also of the outer slide can consequently be removed from the mold cavity without collision.

The segmentation of the inner slide according to the invention can be selected depending on the shape of the casting core to be produced and the adjustment path of the inner slide segments required for collision-free removal of the finished casting core from the device. The greater the number, the greater the variability in the adjustment and shape of the individual inner slide segments. At the same time, however, the number of planes of division of the inner slide increases and, as a result, the number of gaps which separate its individual segments from one another when the inner slide is in the firing position. In practice, it has been found to be favorable here for the inner slide to be divided into at least three inner segments, with an upper limit of at most seven or at most five inner slide segments having proven particularly practical.

The arrangement and the course of the dividing planes and the size of the individual segments of the inner slide can each be adapted directly to the shape of the core to be produced. A particularly simple adjustability of the inner slide segments between their removal and firing positions can be achieved if the planes of division between the inner slide segments intersect in the longitudinal axis of the inner slide.

The inner slide segments are preferably shaped to match at least to the extent that they each have the same proportion of the volume occupied by the inner slide. Such a regular shape can be achieved in that the planes of division between the inner slide segments are arranged distributed around the longitudinal axis of the inner slide at uniform angular intervals.

The basically uniform shape of the segments of the inner slide of a core shooting device according to the invention naturally includes the possibility of individually shaping the outer circumference of the inner slide segments, which is decisive for the shape of the casting core to be produced, in order to reproduce different shaped elements per inner slide segment on the inner side of the casting core assigned to the inner slide.

As already mentioned, it can be expedient to shape the inner slide segments in such a way that, as seen in the longitudinal direction of the inner slide, they overlap with shoulders that protrude or retract in sections in the circumferential direction. In this way, gap-free transitions can be created between its segments despite the division of the inner slide. For this purpose, an inner slide segment can have a shoulder protruding in the circumferential direction which engages in a correspondingly shaped recess of the respectively adjacent inner slide segment. The height of the in the circumferential direction The above paragraph of the one inner slide segment must be adapted to the height of the recess of the adjacent inner slide segment so that this inner slide segment with the upper boundary surface of its recess sits tightly but slidably on the upper surface of the shoulder of the other inner slide segment that engages in the relevant recess. In the event that the casting core to be produced requires gap-free transitions between the inner slide segments at regular angular intervals, the inner slide segments can then be divided into at least two longitudinal sections, of which one section is offset in the circumferential direction of the inner slide relative to the other section, so that the offset section with a shoulder protrudes over the other section of the respective inner slide segment in the circumferential direction and has a recess on its opposite side in the circumferential direction into which the shoulder protruding in the circumferential direction of the inner slide segment adjacent there engages.

Another possibility of minimizing the width of the joint existing between the inner slide segments in the firing position is that, with at least three inner slide segments, one of these inner slide segments can be moved in the radial direction towards the longitudinal axis of the inner slide into a receptacle of the inner slide, which is laterally through one Another slide segment is limited and, when the slide segments are in the firing position, expands in the direction of the longitudinal axis of the inner slide. In this case, the size of the receptacle can be dimensioned so that, to remove the finished core, the inner slide segment that can be moved into the receptacle is first moved in the direction of the longitudinal axis of the inner slide until it is in the space provided for it in the receptacle and then the others Inner slide segments also in the direction of the center of the Inner slide are moved until the inner slide segments, which laterally limit the recording in the firing position, sit with their side surfaces close to the inner slide segment previously moved into the recording. The inner slider segment first moved into the receptacle releases the space that the inner slider segments laterally delimiting the receptacle need in order to be able to be moved into their removal position even if they are in the firing position with their circumferentially directed side surfaces close to the in the recording of the sliding segment rest. The result is a greater travel of the inner slide segment that can be moved into the receptacle, a reduction in the number of wide dividing gaps between the inner slide segments in the firing position, a simple shape of the inner slide segments and an overall simplified assembly of the inner slide.

The adjustment of the inner slide segments can be accomplished in a simple and quick manner in that the adjusting movements of the inner slide segments are coupled to one another by means of a guide. In this case, there is no individual adjustment of each individual segment, as would basically also be possible, but the inner slide segments can be moved together in a linked sequence of movements from the firing position to the removal position and then back to the firing position.

In an automated operation in particular, it is useful if an adjusting device is provided for adjusting the inner slide segments between their removal position and their firing position. This actuating device can be a motorized drive which moves the inner slide segments, if necessary controlled by a correspondingly set control device, between their removal and their firing positions.

For the adjustment of the inner slide segments, the actuating device can comprise a wedge element which is adjustable in the longitudinal direction of the inner slide and whose tip is directed into an interior space of the inner slide that is delimited by the inner slide segments and has a wedge surface which rests against a surface of at least one of the inner slide segments assigned to the wedge element. Depending on the orientation of the wedge surface, in this embodiment, because the wedge element is driven into the inner slide, the inner slide segment resting against it is pushed out of the removal position towards the firing position or from the firing position into the removal position. If the wedge element is withdrawn again, the inner slide segment can move back into its previously assumed position. For this purpose, the inner slide segment can be subjected to a suitable, for example resilient, restoring force. Alternatively or in addition, the wedge element can also be connected to the respective segment in an articulated manner or via some other suitable guide in order to bring about the return to the respective starting position.

In particular in the case of a regular, uniform basic design of the inner slide segments, it can prove to be expedient if the wedge element is designed in the shape of a mandrel and a wedge surface is assigned to the wedge element on which the respective assigned inner slide segment rests.

Another possibility of a coupled adjustment of the inner slide segments between their firing and removal positions is that the actuating device comprises a control link with a link guide with which at least one of the inner slide segments is articulated, and the control link with the inner slide segment being carried along between one of the removal positions of the inner slide segment corresponding position and a position corresponding to the firing position of the inner slide segment can be adjusted.

Such a control link can be used to individually adjust the individual inner slide segments of a device according to the invention. For this purpose, a corresponding backdrop can be assigned to each individual segment.

A minimized outlay in terms of equipment for the adjustment of the inner slide segments results in this context when a link guide is assigned to each inner slide segment in the control link, with which the respectively assigned inner slide segment is articulated. In particular, when the inner slide segments have the same basic shape, it can be useful to arrange the link guides distributed at regular angular intervals around an axis of rotation of the control link arranged coaxially to the longitudinal axis of the inner slide. In this way, the adjustment of the inner slide segments can be effected by simply turning the control link.

In order to enable the outer slide to be easily separated from the finished casting core, the outer slide can be divided into at least two outer slide segments, which can be moved into a distant removal position for removing the core from their firing position, in which they are close to one another and delimit the mold cavity on its outside are.

In this case, an adjusting device for adjusting the outer slide segments can also be provided for adjusting the outer slide segments between their removal position and their firing position. This adjusting device assigned to the outer slide segments can be coupled to the adjusting device assigned to the inner slide segments in order to to achieve a synchronous adjustment of the outer and inner slide segments. It is also possible to drive the adjusting device provided for adjusting the outer and inner slide segments by a common drive.

The adjusting device optionally provided for the adjustment of the outer slide segments can also comprise a control link with a link guide, with which at least one of the outer slide segments is articulated so that the control link between a position corresponding to the removal position of the outer slide segment and a firing position of the outer slide segment is carried along with the outer slide segment corresponding position is adjustable. Here, too, it is again possible to couple or combine the link guide of the outer slide segments with the slide guide of the inner slide segments in such a way that synchronous movement of the outer and inner slide segments is enforced. This is particularly useful if a link guide is assigned to each outer slide segment in the control link, with which the respectively assigned outer slide segment is articulated. Here, too, a single drive is sufficient for the adjustment between the shooting position and the removal position of the outer and inner segments.

The assembly and operation of the inner and outer slides provided according to the invention and the components required for their actuation can be simplified in that the device according to the invention is equipped with at least one base plate on which the outer slide and the inner slide are mounted. Optionally, a cover plate can also be provided on which the outer slide and the inner slide are supported at least in their firing position. The openings or nozzles required for shooting in the respective molding material can be arranged in or on the base plate or cover plate.

A device according to the invention can also comprise an ejection device for ejecting the finished casting core. This is optimally arranged and designed so that the casting core is held on it when the inner slide and the outer slide are in the removal position.

Fig. 1

eine nicht erfindungsgemäße erste Vorrichtung zum Schießen eines Gießkerns in Schussstellung in einer teilweise aufgeschnittenen perspektivischen Ansicht;

Fig. 2

die Vorrichtung gemäß Fig. 1 in einer Ansicht von oben;

Fig. 3

die Vorrichtung gemäß Fig. 1 mit in Entnahmestellung befindlichem Innenschieber und Außenschieber in einer Fig. 1 entsprechenden Ansicht;

Fig. 4

die Vorrichtung gemäß Fig. 3 in einer Ansicht von oben;

Fig. 5

die Vorrichtung gemäß Fig. 1 in Entnahmestellung in perspektivischer Ansicht;

Fig. 6

eine erfindungsgemäße zweite Vorrichtung zum Schießen eines Gießkerns in Schussstellung in einer Ansicht von oben;

Fig. 7

die Vorrichtung gemäß Fig. 6 in einer Ansicht von unten;

Fig. 8

die Vorrichtung gemäß Fig. 7 mit in Entnahmestellung befindlichem Innenschieber in Schussstellung in einer perspektivischen Ansicht von oben;

Fig. 9

die Vorrichtung gemäß Fig. 8 in einer perspektivischen Ansicht von unten;

Fig. 10

einen Innenschieber in perspektivischer Ansicht.

The invention is explained in more detail below with the aid of a drawing showing exemplary embodiments. Their figures each show schematically:

Fig. 1

a first device not according to the invention for shooting a casting core in the firing position in a partially cut-away perspective view;

Fig. 2

the device according to Fig. 1 in a view from above;

Fig. 3

the device according to Fig. 1 with an inner slide in the removal position and an outer slide in one Fig. 1 appropriate view;

Fig. 4

the device according to Fig. 3 in a view from above;

Fig. 5

the device according to Fig. 1 in the removal position in a perspective view;

Fig. 6

a second device according to the invention for shooting a casting core in the shooting position in a view from above;

Fig. 7

the device according to Fig. 6 in a view from below;

Fig. 8

the device according to Fig. 7 with the inner slide located in the removal position in the firing position in a perspective view from above;

Fig. 9

the device according to Fig. 8 in a perspective view from below;

Fig. 10

an inner slide in perspective view.

The ones in the Figures 1 - 4 Device 1 shown and in the Figures 6 - 9 The device 100 shown serve for shooting a casting core G, as exemplified in FIG Fig. 5 is shown. The individual parts of the devices 1, 100 are made of materials that have been tried and tested in the prior art.

The casting core G to be shot from a conventional molding material provided as a molding sand-binder mixture accordingly has the basic shape of a cylindrical hollow body with an annular cross-section which extends over a height H in the longitudinal direction LR coaxially to the central longitudinal axis LS of the casting core G. The casting core G thus delimits with its circumferential wall U an interior space I which is open at its ends and depicted by the inner slide 2. The circumferential wall U is not designed as a solid, closed wall, but is in radially protruding projections V, recesses A, local material accumulations M. , Connecting webs S and the like broken down.

The devices 1, 100 each include an inner slide 2, an outer slide 3 and a base plate 4. Between the outer slide 3 and the inner slide 2 there is an in Fig. 1 For the sake of clarity, only schematically indicated mold cavity 5, which depicts the casting core G to be shot with the device 1, is bounded. The inner slide 2 with its outer circumferential surface 6 and the outer slide 3 delimit it the mold cavity 5 with its inner circumferential surface 7. The distance between the inner circumferential surface 7 and the outer circumferential surface 6 determines the clear width W of the mold cavity 5.

The inner slide 2 is divided into five identically shaped inner slide segments 2 a - 2 e, which are arranged at equal angular intervals around the central longitudinal axis LZ of the inner slide 2. The longitudinal axis LZ lies in each of the division planes T1-T5, by which the inner slide segments 2a-2e are separated from one another. The planes of division T1-T5 accordingly intersect in the longitudinal axis LZ.

The inner slide segments 2a-2e sit on the base plate 4 and are mounted on it.

In the Figures 1 - 4 For this purpose, the base plate 4 has a central opening 8 oriented concentrically to the longitudinal axis LZ, starting from which five slot-shaped guides 9a, 9d are formed in a star-shaped manner at equal angular intervals around the center of the opening 8.

The guides 9a, 9d are each assigned one of the inner slide segments 2a-2e. A sword-like guide member 10a, 10d is attached to the underside of the inner slide segments 2a - 2e assigned to the base plate 4, with which the respective inner slide segment 2a - 2e is positively displaceable in the respectively assigned guide 9a, 9d.

On their inner side assigned to the longitudinal axis LZ, the inner slide segments 2a-2e each have an inclined surface 11a, 11d which, starting from the underside of the inner slide segments 2a-2e assigned to the base plate 4, in the direction of the upper side 12 of the Device 1 is inclined, so that the distance between the inclined surfaces 11a, 11d of the inner slide segments 2a-2e in the direction of the top 12 decreases continuously.

A spike-like wedge element 13 is pushed into the opening 8, on which a wedge surface 13a, 13d is formed, distributed at regular angular intervals around the longitudinal axis LZ for each of the inner slide segments 2a - 2e, which, starting from the underside of the wedge element 13 assigned to the base plate 4, is formed in the direction the top side 12 rises, so that the wedge surfaces 13a, 13d enclose an acute angle with the longitudinal axis LZ. The inclination of the wedge surfaces 13a, 13d is the same as the inclination of the inclined surfaces 11a, 11d of the inner slide segments 2a - 2e, so that the wedge surfaces 13a, 13d of the wedge element 13 lie tightly against the inclined surfaces 11a, 11d of the inner slide segments 2a - 2e. A T-slot guide 14a-14e, 15a-15e is molded into the inclined surfaces 11a, 11d and the wedge surfaces 13a, 13d, which extend over the height of the respective inclined surface 11a, 11d and the wedge surface 13a, 13d and are thus oriented that each T-slot guide 14a-14e of the inclined surfaces 11a, 11d is opposite a T-slot guide 15a-15e of the wedge surfaces 13a, 13d. In each of the T-slot guides 14a-14e, 15a-15e assigned to one another in this way, a double-T-shaped sliding member, not shown here, is mounted, via which the respective inner slide segment 2a-2e is coupled to the wedge element 13 in such a way that the inner slide segments 2a - 2e are positively connected to the wedge element 13 in the radial direction R, but the wedge element 13 is relatively displaceable in the longitudinal direction LR of the longitudinal axis LZ to the inner slide segments 2a-2e.

The wedge element 13 is coupled to an adjusting device, not shown here, which pushes the wedge element 13 into or out of the inner slide 2 in the longitudinal direction LR along the longitudinal axis LZ in response to corresponding control signals. If the wedge element 13 in the Inner slide 2 is pushed in, the inner slide segments 2a - 2e are pushed away from the longitudinal axis LZ in the radial direction R from the longitudinal axis LZ in accordance with the slope of the wedge surfaces 13a, 13d of the wedge element 13 and the inclined surfaces 11a, 11d of the inner slide segments 2a - 2e resting on them have reached the approximate shooting position on the outer slide 3 ( Fig. 1,2 ). In the firing position, the mold cavity 5 is sealed off from the surroundings by the outer slide 3 and inner slide 2.

In the course of the shift into the firing position, gaps 16a-16e are formed between the inner slide segments 2a-2e in the longitudinal direction LR, which gaps 16a-16e are also present in the area of the outer circumferential surface 6 of the inner slide 2 that delimits the mold cavity 5 on its inner side facing the inner slide 2. However, due to a suitable design of the inner slide segments 2a-2e and a corresponding shape of the casting core G, these gaps 16a-16e do not interfere.

The molding material provided for producing the casting core G is now shot into the mold cavity via shot nozzles (not shown here for the sake of clarity) and then solidified in a manner known per se.

To remove the finished casting core G, the wedge element 13 is pulled out of the inner slide 2 so that the inner slide segments 2a - 2e coupled to it are moved towards the longitudinal axis LZ. This movement is carried out until the removal position of the inner slide segments 2a - 2e is reached, in which the gaps 16a - 16e are closed and the inner slide segments 2a - 2e lie tightly against one another with their side surfaces ( Fig. 3.4 ). In this state, the inner slide segments 2a-2e are separated from the finished casting core G to such an extent that the casting core G is out of the mold cavity in the longitudinal direction LR 5 can be removed after the outer slide 3 has also been moved away from it in the radial direction R.

For this purpose, the outer slide 3 is divided into seven basically identically shaped outer slide segments 3a - 3g, the longitudinal axis LZ also lying in each of the division planes between the outer slide segments 3a - 3g, the division planes between the outer slide segments 3a - 3g thus also being in the longitudinal axis Cut LZ. Via an actuating device, not shown here, the outer slide segments 3a - 3g are moved in a direction radially aligned with respect to the longitudinal axis LZ from their firing position approximated to the inner slide 2 into a removal position remote from the inner slide 2 in which the mold cavity 5 is open so far that the casting core G can be ejected from the mold cavity 5 in the longitudinal direction LR.

For ejection, the device 1 comprises a plurality of ejectors which are oriented in their axially parallel to the longitudinal axis LZ in the longitudinal direction LR and are coupled in a manner known per se, which are likewise not visible here. The ejectors are guided in a manner known per se in the base plate 4 and are designed and arranged in such a way that the casting core G, while the inner slide segments 2a - 2e and the outer slide segments 3a - 3g are moved into their respective removal position away from the casting core G, to the Ejectors is held. When the inner slide segments 2a - 2e and the outer slide segments 3a - 3g are in their removal positions, the ejectors lift the finished casting core G in the longitudinal direction LR out of the mold cavity 5 so that it can be gripped and transported away, for example, by a gripper, also not shown here.

The ones in the Figures 6 - 9 The device 100 shown corresponds in its basic structure to the device 1. So are the Device 100, as in device 1, the inner slide 2 and the outer slide 3 are divided in the same way into inner slide segments 2a-2e and outer slide segments 3a-3g.

A difference between the device 1 and the device 100 consists in the adjusting device provided for adjusting the inner slide segments 2a-2e and the outer slide 3a-3g between their firing and removal positions.

For example, the actuating device in the device 100 comprises a disk-shaped control link 17 which is rotatably supported flat against the underside of the base plate 4 on the underside of the base plate 4. The axis of rotation of the control link 17 coincides with the longitudinal axis LZ. One link guide 17a-17e is molded into the control link 17 for each of the five inner slide segments 2a-2e.

The link guides 17a - 17e, which are distributed around the longitudinal axis LZ at equal angular intervals, are each cut into the control link 17 as an arcuate slot. The link guides 17a - 17e are directed radially outward from their one end located closer to the longitudinal axis LZ and at the same time curved convexly in the direction of the outer circumference of the control link 17 when viewed from above.

A guide pin 18a-18e engages in each of the link guides 17a-17e, one of which is attached to the underside of each of the inner slide segments 2a-2e.

In relation to the link guides 17a-17e, offset radially outward, additional outer link guides 19a-19g are formed in the control link 17. The link guides 19a - 19g are included corresponding adaptation of their proportions as the inner link guides 17a-17e. A guide pin 20a-20g is guided in each of the outer link guides 19a-19g. In each case one of the guide pins 20a-20g is attached to the underside of one of the outer slide segments 3a-3g.

If the control link 17 in the Figures 7 and 9 The arrangement of the link guides 17a-17e, 19a-19g shown in the figure is rotated counterclockwise around the longitudinal axis LZ in response to a corresponding control signal by means of a rotary drive, not shown here, of the actuating device, and the guide pins 18a-17e that engage with it via the guide pins 18a-17e 18e coupled inner slide segments 2a - 2e moved towards the outer slide segments 3a - 3g. At the same time, the outer slide segments 3a-3g, which are coupled via the guide pins 20a-20g engaging in the outer link guides 19a-19g, are also moved towards the inner slide segments 2a-2e.

The rotation of the control link 17 is stopped when the outer slide segments 3a - 3g and the inner slide segments 2a - 2e move in the firing position that is closer to one another ( Fig. 6.7 ).

If, on the other hand, the control link 17 is rotated clockwise, the inner slide segments 2a-2e are moved back into their removal position, in which their side surfaces are in close contact with one another. In the same way, the outer slide segments 3a - 3g are moved into their removal position, in which they are as far away from the inner slide segments as possible ( Fig. 8.9 ). The core fired in each case can now be ejected unhindered from the device 100.

The Figures 6 to 9 and especially the Fig. 10 schematically show an example of how the inner slide segments 2 a - 2 e of the inner slide 2 can be designed in such a way that the gaps 16a - 16e that arise between them when moving into the firing position do not interfere with the manufacture of the casting core G.

The inner slide segments 2a, 2b shown there each have an upper length section 2a ', 2b' and a lower length section 2a ", 2b". The lower longitudinal sections 2a ", 2b" are each offset in the circumferential direction UR with respect to the upper longitudinal section 2a ', 2b', so that the lower longitudinal section 2a ", 2b" is provided with a shoulder 21 on one side of the respective inner slide segment 2a, 2b in the circumferential direction UR beyond the upper longitudinal section 2a ', 2b' and a recess 22 of the same size is formed on its opposite side.

A correspondingly shaped and arranged recess 22 is formed in the area of the inner slide segment 2c assigned to the inner slide segment 2b, so that the inner slide segment 2b with its shoulder 21 engages the upper length section 2c 'of the inner slide 2c in the recess 22 of the inner slide 2c, overlapping. Likewise, the inner slide segment 2e has, on its side assigned to the inner slide segment 2a, a shoulder shaped like the other paragraphs 21 which engages in the assigned recess 22 of the inner slide segment 2a. In the case of adjacent inner slide segments 2a, 2b; 2b, 2c; 2e, 2a, a shoulder 21 of each inner slide segment 2a, 2b, 2e engages in a recess 22 of the respectively adjacent inner slide segment 2a, 2b, 2c.

The heights of the shoulder 21 and the recess 22 are each adapted to one another in such a way that the upper boundary surface of the respective recess 22 sits tightly on the top of the shoulder 21 engaging in this recess 22. In this way, the inner slide segments 2a, 2b, 2c, 2e are mutually aligned in the area of the outer circumferential surface 6 overlapping areas are formed, between which there are no open gaps, but only tight joints, so that the mold elements to be depicted on the casting core G can be depicted without interruption despite the gaps 16a, 16b, 16c between the inner slide segments 2a, 2b, 2c and 2e.

The inner slide segment 2d and the inner slide segments 2c and 2e adjoining it are designed in a different way so that only tightly closed gaps 16d, 16e are present between the inner slide segments 2c, 2d, 2e in the firing position.

For this purpose, in the circumferential direction UR to the assigned circumferential side surfaces 2d '' ', 2d' '' 'of the inner slide segment 2d adjoining circumferential sides 2c' '' and 2e '' 'of the inner slide segments 2c and 2e bulges 23,24 are formed, which extend over the Extend the height of the inner slide segment 2. The bulges 23, 24 thus delimit, in the inner slide segment 2, a receptacle 25 for the slide segment 2d that extends over the height of the inner slide segment 2.

In the radially outward direction R, the bulges 23,24 are each limited by a narrow edge section 2c ″ ″ and 2e ″ ″ of the inner slide segments 2c, 2e protruding in the circumferential direction UR in the direction of the inner slide segment 2d. When the inner slide segments 2c-2e are in the firing position, the edge sections 2c ″ ″ and 2e ″ ″ bear close to the respectively assigned peripheral side surface 2d ″ ″ and 2d ″ ″ of the inner slide segment 2d.

The bulges 23,24 and the associated receptacle 25 are dimensioned and adapted in their shape to the shape of the peripheral side surfaces 2d ''',2d''''and the dimensions of the inner slide segment 2d that the inner slide segment 2d with the inner slide segments 2c, 2e remaining in their firing positions in the direction of the central longitudinal axis LS of the inner slide 2, into which the receptacle 25 can be moved until it has reached its removal position. In this position, there is a gap between the circumferential side surfaces 2c "" and 2e '''''' of the inner slide segments 2c, 2e on the one hand and the circumferential sides 2d '''and 2d "' of the inner slide segment 2d on the other hand, the clearance of which is so large that then the inner slide segments 2c, 2e with the inner slide segments 2a, 2b can also be moved into their removal position in the direction of the central longitudinal axis LZ. If the inner slide segments 2a, 2b, 2c, 2e have also reached the removal position, all inner slide segments 2a - 2e lie with their peripheral side surfaces tightly against the assigned peripheral surfaces of their adjacent inner slide segments 2a - 2e ( Fig. 8 ).

The movement into the firing position then takes place in reverse order.

REFERENCE MARK

1,100

Device for shooting casting cores G

2

Inner slide

2a - 2e

Inner slide segments

2a '- 2e'

upper length of the inner slide segments 2a-2e

2a "- 2e"

lower length of the inner slide segments 2a-2e

2d '' ', 2d' '' '

Circumferential side surfaces of the inner slide segment 2d

2c '' ', 2e' ''

Circumferential sides of the inner slide segments 2c and 2e

2c "", 2e ""

Edge sections of the inner slide segments 2c, 2e

3

Outside slider

3a - 3d

Outer slide segments

4th

Base plate

5

Mold cavity

6

Outer peripheral surface of the inner slider 2

7th

Inner peripheral surface of the outer slide 3

8th

central opening of the base plate 4

9a, 9d

slot-shaped guides

10a, 10d

Management links

11a, 11d

Inclined surfaces of the inner slide segments 2a - 2e

12th

Top of the device 1

13

thorn-like wedge element

13a, 13d

Wedge surfaces of the wedge element 13

14a - 14e

T-slot guide of the inner slide segments 2a - 2e

15a - 15e

T-slot guide of the wedge element 13

16a - 16e

column

17th

disc-shaped control link

17a - 17e

inner backdrop guides

18a - 18e

Guide pins

19a - 19g

outer backdrop guides

20a - 20g

Guide pins

21st

paragraph

22nd

Recess

23.24

Bulges

25th

admission

A.

Recesses in the peripheral wall U

G

Casting core

H

Height of the core G

I.

Interior of the casting core G

LR

Longitudinal direction

LS

central longitudinal axis of the casting core G

LZ

central longitudinal axis of the inner slide 2

M.

local accumulations of material on the peripheral wall U

R.

radial direction

S.

Connecting webs of the peripheral wall U

T1 - T5

Dividing planes between the inner slide segments 2a - 2e

U

Peripheral wall of the casting core G

UR

Circumferential direction

V

Projections of the peripheral wall U

W.

clear width of the mold cavity 5

Claims (17)

1. Device for shooting a foundry core (G), which surrounds a free inner space (I) on its outer boundaries, wherein the device (1; 100) has a mould cavity (5) representing the foundry core (G), which circulates around an inner slider (2) extending along a longitudinal axis (LZ) and is delimited on its outer side by an outer slider (3) circulating around the mould cavity (5), wherein the clear width (W) of the mould cavity (5) is determined by the distance of the inner surface (7), assigned to the mould cavity (5), of the outer slider (3) to the outer surface (6) of the inner slider (2), wherein the inner slider (2) is divided into at least three inner slider segments (2a to 2e) along dividing planes (T1 to T5), which extend in the longitudinal direction (LR) of the inner slider (2) and wherein the inner slider segments (2a to 2e) are displaceable between a removal position, in which they are positioned approximated in relation to one another and to the longitudinal axis (LZ) of the inner slider (2) and the clear width (W) of the mould cavity (5) present between the inner slider (2) and the outer slider (3) is increased, into a shooting position approximating the outer slider (3), in which the clear with (W) of the mould cavity (5) corresponds to a target specification for the foundry core (G) to be shot, characterised in that one of the inner slider segments (2d) is movable in the radial direction on the longitudinal axis (LS) of the inner slider (2) into a receiving portion (25), which is laterally delimited by in each case one further slider segment (2c, 2e) and expands in the direction of the longitudinal axis (LS) of the inner slider (2) in the case of the slider segments (2a to 2e) being in the shooting positon.
2. Device according to claim 1, characterised in that the dividing planes (T1 to T5) between the inner slider segments (2a to 2e) intersect in the longitudinal axis (LZ) of the inner slider (2).
3. Device according to claim 2, characterised in that the dividing planes (T1 to T5) between the inner slider segments (2a to 2e) are arranged at even angular intervals distributed around the longitudinal axis (LZ) of the inner slider (2).
4. Device according to any one of the preceding claims, characterised in that at least one inner slider segment (2a to 2e) has an offset (21) protruding in the circumferential direction (UR), which engages into a correspondingly formed recess (22) of the in each case adjacent inner slider segment (2a to 2e).
5. Device according to any one of the preceding claims, characterised in that the adjusting movements of the inner slider segments (2a to 2e) are coupled to one another by means of a guide (14a to 14e, 15a to 15e, 17).
6. Device according to any one of the preceding claims, characterised in that an adjusting device is provided for adjusting the inner slider segments (2a to 2e) between their removal position and their shooting position.
7. Device according to claim 6, characterised in that the adjusting device comprises a wedge element (13), adjustable in the longitudinal direction (LR) of the inner slider (2), directed with its tip into an inner space of the inner slider (2) surrounded by the inner slider elements (2a to 2e), having a wedge surface (13a, 13d), which abuts on a surface (11a, 11d), assigned to the wedge element (13), of at least one of the inner slider segments (2a to 2e).
8. Device according to claim 7, characterised in that the wedge element (13) is formed in a mandrel shape and a wedge surface (13a, 13d) is assigned to the wedge element (13) of each of the inner slider segments (2a to 2e), on which wedge surface the respective assigned inner slider segment (2a to 2e) abuts.
9. Device according to claim 7, characterised in that the adjusting device comprises a control connecting rod (17) with a connecting rod guide (17a to 17e), with which at least one of the inner slider segments (2a to 2e) is articulately coupled and in that the control connecting rod (17) is adjustable, entraining the inner slider segment (2a to 2e), between a position corresponding to the removal position of the inner slider segment (2a to 2e) and a position corresponding to the shooting position of the inner slider segment (2a to 2e).
10. Device according to claim 9, characterised in that a connecting rod guide (17a to 17e) is assigned to each inner slider segment (2a to 2e) in the control connecting rod (17), with which the inner slider segment (2a to 2e), assigned in each case, is articulatedly coupled.
11. Device according to claim 10, characterised in that the connecting rod guides (17a to 17e) are arranged at regular angular intervals distributed around a rotary axis of the control connecting rod (17) arranged coaxially to the longitudinal axis (LZ) of the inner slider (2).
12. Device according to any one of the preceding claims, characterised in that the outer slider (3) is divided into at least two outer slider segments (3a to 3d), which, for the removal of the finished foundry core (G), are movable from their shooting position, in which they, sitting closely together, delimit the mould cavity (5) on its outer side, into a removed removal position.
13. Device according to claim 12, characterised in that an adjusting device is provided for adjusting the outer slider segments (3a to 3d) between their removal position and their shooting position.
14. Device according to claim 13, characterised in that the adjusting device for the adjustment of the outer slider segments (3a to 3d) comprises a control connecting rod (17) with a connecting rod guide with which at least one of the outer slider segments (3a to 3e) is articulatedly coupled and in that the control connecting rod, entraining the outer slider segment (3a to 3d), is adjustable between a position corresponding to the removal position of the outer slider segment (3a to 3d) and a position corresponding to the shooting position of the outer slider segment (3a to 3d).
15. Device according to claim 13, characterised in that a connecting rod guide is assigned to each outer slider segment (3a to 3d) in the control connecting rod, with which the outer slider segment (3a to 3d), assigned in each case, is articulatedly coupled.
16. Device according to any one of the preceding claims, characterised in that it comprises at least one base plate (4) on which the outer slider (3) and the inner slider (2) are mounted.
17. Device according to any one of the preceding claims, characterised in that it comprises an ejector device for ejecting the finished foundry core (G).

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