EP2385883A2

EP2385883A2 - Casting tool and core moulding machine

Info

Publication number: EP2385883A2
Application number: EP09751821A
Authority: EP
Inventors: Ivo Herzog
Original assignee: Herzog&Herzog Holding und Service GmbH; Herzog and Herzog Holding und Service GmbH
Current assignee: Herzog and Herzog Holding und Service GmbH
Priority date: 2008-11-14
Filing date: 2009-11-12
Publication date: 2011-11-16
Anticipated expiration: 2029-11-12
Also published as: WO2010054809A3; DE102008058764B4; DE102008058764A1; EP2385883B1; US20100122790A1; WO2010054809A2

Abstract

The invention relates to a casting tool for manufacturing cast products, particularly for manufacturing cores (90) for sand casting products, having a support device comprising a first and a second support element (10, 20, 50) that can be moved toward one another in a joining direction (2), and having at least two moulding parts (30, 40) of which a first moulding part (30) is fastened on the first support element (10, 20) and a second moulding part (40) is fastened on the second support element (50, 60), wherein the moulding parts (30, 40) each have a mould recess (33, 34), wherein the mould recesses (33, 34) of the moulding parts (30, 40) together define the mould of at least one casting core (90) when the first and the second moulding part (30, 40) contact one another. According to the invention, one of the support parts (10, 20) comprises a first circumferential frame (20) that surrounds the moulding part (30) fastened on this support part (10, 20), wherein the frame (20) as a multi-segment frame comprises at least two frame segments (22, 24, 26) that are connected to one another via interlocking connection means. The invention can be used as an application as particularly simple and quickly produced core moulding tool.

Description

Description Casting tools and core forming machine

Field of application and state of the art

The invention relates to a casting tool for the production of cast products, in particular of cores for sand casting products, of die-cast products and chill casting products. A generic casting tool has a support device consisting of a first and a second support member which are movable toward and away from each other in a joining direction. Furthermore, such a generic casting tool has at least two molded parts, of which in each case a first molded part is attached to the first support part and the second molded part is attached to the second support part. In this case, the mold parts each have a mold cavity facing one another, the mold cavities of the mold parts jointly defining the shape of at least one workpiece to be produced, such as a cast core, when the first and second mold parts abut one another and the mold is thus closed. The invention also relates to a core molding machine with a generic casting tool. Generic casting tools are known from the prior art. As mold core tools they serve, for example, the production of cores, for example of sand cores or ceramic cores, which are used in subsequent casting operations to keep as lost molds cavities of the workpiece to be cast, for example, metallic casting material. In the case of sand cores, the production takes place in that the common volume formed by the mold cavities of the molded parts described is filled with pressurized sand mixture, which is subsequently gassed, so that a binder bonds the individual sand grains together to form a solid sand core. This solidified sand core is subsequently removed from the core mold and placed in a mold. There he prevents that the cavity defined by him with the casting material, such as a metal, is filled. After completion of the workpiece, the cavity was kept free by the sand core, the sand is removed from the workpiece. As lost molds such cores are used only for one casting process.

For the production of sand cores described, it is known from the prior art to use a casting tool in the form of a core mold, which has two shell-shaped mold boxes as supporting parts, which are provided with approximately cuboidal pockets, in which the mold parts are inserted in each case. These known from the prior art molding boxes take in addition to the task to carry the moldings and lead, and the task of sealing the moldings to the outside. This seal is of considerable relevance, since in an insufficiently sealed system during fumigation not all parts of the sand core are sufficiently supplied with gas, so that there is no sufficient connection of the sand grains together to a uniform and solid sand core. That this seal between the two halves of the mold Box must be due to the fact that the moldings are not sufficiently accurately positioned to each other, so that they do not rest completely gas-tight in the dividing plane.

The limited positioning of the molded parts is largely due to the inaccurate tolerance compliance of the molding boxes. The molding boxes are usually produced as castings, which are subsequently machined. This machining takes place with respect to the pockets through which the moldings are guided and in which the moldings are fastened, by a milling operation which can not ensure sufficient conformance to achieve the tightness between the moldings in the closed state of the mold. From the prior art, in addition to the described casting production of molding boxes and the production of welded construction is known, in which case the problem in terms of manufacturing accuracy also exists because the individual components from which the welded molding box is assembled during welding by the thermal stress in be distorted to a high degree, so that a complex post-processing is required by which, however, sets no accuracy that would allow a sealing of the mold cavity on the mold parts in sufficient quality.

In addition to the insufficiently good shape compliance, the disadvantage of the cast or welded molding boxes is also in the high mass of such boxes. This is often so high that the molding boxes can not be stored in high shelves, but must be stored on the usually strongly limiting floor area.

Another disadvantage associated with the previous designs is that the alignment of the moldings with each other is difficult. Since the moldings only then come into contact with each other, Although the mold boxes of the lower and the upper mold part come to rest on each other, an alignment of the mold parts to each other is hardly possible. Accordingly, the quality of the cores produced is not always ideal.

Task and solution

The object of the invention is to develop a generic casting tool such that the disadvantages of the prior art are eliminated or at least mitigated.

According to the invention this is achieved in that one of the support members has a first circumferential frame which surrounds the molded part attached to this support member, wherein the frame is composed as a multi-segment frame of at least two frame segments which are interconnected via positively acting connection means.

Accordingly, in a casting tool according to the invention, at least part of the supporting part usually welded or cast in the prior art is composed of segments which are not connected to each other either by a common casting or by welding seams. Instead, the frame segments are connected to each other by positively acting connection means, in particular by screws, so that during the production of such a frame depending on the manufacturing accuracy of the segments, a very accurate dimensional compliance of the overall frame can be achieved without being distorted by thermal load, the output components. As frame segments are understood in the context of the invention, those parts of the frame which provide at least part surfaces of the molding facing inner surface of the frame. In addition to the fact that the production of the frame via positive connection means a high accuracy of the shape of the Ensures frame, a significant advantage of the described structure is that in the manner of a modular standard parts can be used as segments of the frame, which are selected depending on the required dimensions of the casting tool and interconnected. The connection of the segments is preferably circumferential, the interconnected segments thus form a closed segment ring in the form of the first frame. The modular principle mentioned makes it possible to significantly reduce the currently very long production times for a molding box of individually defined size, since the individual segments of the multi-segment frame finished or almost finished machined can be kept in a warehouse and can be combined depending on the size specifically required. Another advantage of the construction of the frame of segments, which are combined with each other via positively acting connection means is that this allows the use of materials that are poor or not weldable or pourable. In particular, materials can be used which combine a particularly high tensile strength with a low specific weight.

A casting tool according to the invention has at least two molded parts which together define a shape for a workpiece, in particular for a core such as a sand core. However, it may also be provided in each case a plurality of mold parts on the two support parts. In this case, in the context of this invention, the mold parts fixed to the first support part are referred to as first mold parts, and the mold parts fixed to the second support part are referred to as second mold parts. Together, the first molded part and the second molded part form a common shape, which in the closed state has a cavity in the negative mold of the workpiece to be produced, in particular of the core to be produced, by the two-sided mold recesses. The frame can be matched to the size of the moldings such that it serves as a guide. This is achieved by a close clearance fit between the moldings and the frame. It is preferred, however, that in a manner further explained below, the frame has a free inner surface which is significantly larger than the base surface of the molded parts, so that a guiding function is not taken over by the frame.

It is furthermore preferred if a described multi-segment frame is provided only on one of the supporting parts, which surrounds both molded parts in the contiguous state of the molded parts. However, it is also conceivable to provide two such frames, each of the frames surrounding those moldings which are fixed to each support member, which is also associated with the respective frame.

The casting tool is preferably a core molding tool for producing casting cores with the features specific for this purpose, such as, for example, the presence of a squeegee, which levels the excess sand in the area of sand injection holes after being shot.

In a design with only one frame, which surrounds the first and the second mold part, it is preferred if the frame is attached to the first support part. The first support member is in the context of the following description of that support member which is raised in the course of demolding of the produced workpieces, in particular the cores produced, relative to the stationary second support member. However, the motion sequences are only relevant with regard to the relative displacements of the components, so that a lowering of the second support part can likewise be provided in the case of local strength of the first support part. The preferred embodiment, in which the first frame is part of the first support member, holds in the event that the first support member is provided above the lower support member, the advantage that the first frame during removal automatically together with the first support member relative to the second support member is raised, so that the bottom remaining lower part of the tool with the second support member and the second molded part attached to a problem-free removal of the produced workpiece, in particular of the manufactured core, for example via a so-called rake or a handling system allows without the first frame is a hindrance.

In a further development of the invention, the first support part on a first mounting plate on which the attached to the first support member molding is attached and to which also the first frame is attached.

As a plate is considered in connection with the first mounting plate, a component which provides at least a completely flat surface for fixing the first frame and the first molded part. By definition, no part of this mounting plate projects beyond an area that serves to fix the first moldings. The use of such at least one side completely flat mounting plate is advantageous because such a plate with comparatively little effort while maintaining low tolerances can be produced, for example by surface grinding. This has the consequence that also fixed to the plate first molding can be aligned very accurately. The flat side of the mounting plate, which faces towards the first molded part attached to it, preferably has a level tolerance of less than 0.2 mm, preferably less than 0.1 mm, in particular less than 0.05 mm. At this first mounting plate, the first frame is preferably also fastened by means of detachable positively acting connection means such as screws. Such a connection via positive connection means makes it possible to completely dispense with defective thermal influence during the production of the first support member. The solubility of these connecting means also allows the fast coupling of the first frame from the first mounting plate. This solubility is advantageous because the casting tool according to the invention is basically suitable due to its construction, to be operated completely without the frame, so that this frame can be omitted on a case by case basis. In particular, however, it is advantageous to remove the frame only during the installation of the casting tool, so that it is possible to bring the molded parts of the two support members relative to each other in a perfect alignment with the frame removed, only to subsequently the frame as a complementary protective measure again to connect with the first mounting plate.

It is particularly advantageous if the second support part has a second mounting plate to which the second molded part attached to the second support part is attached. With regard to the advantages of the second mounting plate, the same applies as for the first mounting plate: The plate allows by their design the production of a closely toleranced flatness, for example achievable by means of surface grinding, so that in a design with two mounting plates high accuracy, the moldings when closing the mold in Allows the partition plane almost perfectly abut each other and thus even self effectively seal the jointly formed form, without the need for this necessarily the frame.

With respect to both mounting plates, it is true that they should also be able to be fixed to their connection components with small tolerances that these are preferably attachment plates whose parallelism tolerance with respect to the two opposite sides of the plate is also less than 0.2 mm, preferably less than 0.1 mm, in particular less than 0.05 mm.

In a further development of the invention, the second support part has a second circumferential frame, which is attached to the side facing away from the second mold part or the second mold parts of the second mounting plate. While the first frame serves the purpose of protecting and optionally guiding the moldings, as well as the purpose of providing a supplemental seal against the environment, the second frame is provided as a solidly force-transmitting component over which the forces are guided by which the moldings during the introduction of the casting material, so for example the sand, are pressed together. This second frame is preferably also designed as a multi-segment frame. In addition to its function as a force-conducting component between a machine table and the second mold part of the second frame also forms a protective cover for a lifting device of the casting tool, which serves the purpose of ejecting the finished workpiece or the finished core of the second molded part. The second frame can be fastened directly on a machine table or be connected by means of an adapter plate on the side facing away from the second mounting plate side with the machine table.

For both frames, these preferably have four side plates oriented at right angles to one another as main segments, wherein the side plates are connected to one another directly or indirectly via intermediate segments, in particular via corner segments. The structure of the frame of at least four side plates represents a particularly simple design. The side plates can be directly connected to each other, for example, that they all or part of them have frontal holes for connecting screws and / or provided at the corner near the end of the adjacent side plates through holes for those connecting screws. A direct connection is also possible in that on the side plates in each case a 45 ° -shank is provided and the connecting screw connects the side plates perpendicular to the miter plane. Alternatively, the side plates only have frontal holes and are connected to each other via a total of four corner segments. The use of simple side plates reduces the manufacturing effort and significantly reduces the production time, since standardized standard plates can be used, which only have to be adapted to the specific application in terms of their height in the joining direction and their length transverse to the joining direction. The corner segments are particularly advantageous because only frontal holes must be introduced through them in the side plates. Among other things, this has the consequence that all four side plates can be formed identically with frontal holes and without through holes. The corner segments are also well suited to provide additional functions, such as points of attack for lifting means, by means of which handling in particular the first frame is possible.

Furthermore, it applies to both frames that they can also have several side plates per side, wherein the side plates are arranged one behind the other in the joining direction of the tool. So can be made for special applications frames that have a particularly high height and yet can be used on prefabricated side panels of a given height. Preferably, these side plates are connected to each other, for example by screws. It is also possible to use continuous corner segments over which the several side panels of a page are indirectly connected to each other. All four side plates can be made identical in cross section and possibly differ only in terms of their length. However, it is preferred that at least two opposing side plates are provided with recesses which allow the engagement of a gripping instrument for handling the upper support member. These recesses are preferably provided on the outside upper edge of the respective two side plates in the form of a milled track, preferably only by connecting the respective frame with the first and second mounting plate, the recess is closed upwards and thus can fulfill their purpose.

The corner segments are preferably in the joining direction extended profile sections, in particular continuous casting profile sections formed. Preferably, these continuous casting profiles are produced directly with the cross section of the corner segments, so that only a small post-processing is required. Alternatively, it is also possible to use standard profiles such as square profiles, which receive the shaping of the corner segment by subsequent machining. In both cases, the respective preparations for the positive connection means with the side plates are still provided, for example, aligned transversely to the extension of the profile holes for connecting screws.

Preferably, at least at two opposite corner segments, preferably at all four corner segments, lifting lugs are attached, wherein the lifting lugs are formed and mounted so that they do not protrude the escape of the adjacent to the respective corner segment side plates. The lifting lugs are therefore provided so that they are in a state of rest in a free space, which is bounded on the one hand by the corner segment and on the other hand by two imaginary planes, each corresponding to the plane on which is the outside of the respective adjacent side panels. This design allows the entire casting tool, or at least the first or the second frame, to be supported on a base surface which does not need to be larger than the surface defined by the spacing of the outside of the respective opposite side plates, in spite of the presence of the lifting eyes. The purpose of the lifting eyes is the handling of the supporting parts or the frame, which can be transported in a simple manner by means of the lifting lugs.

It is considered particularly advantageous if a casting tool according to the invention, which has a first and a second frame, uses side plates on the first and second frame which, with regard to their height in the joining direction, with respect to their length transversely to the joining direction, with respect to their thickness, with respect to the arrangement their connection holes for connection to the corner segments and / or a mounting plate and / or with respect to the material match. It is already advantageous if individual of these properties match. It is not absolutely necessary that all side plates of the respective frames are identical. One advantage already arises if one or two side plates of both frames have individual features of identical design in each case. The conformity with respect to the mentioned features is the above-mentioned modular principle. A variety of processing steps on the side plates can be performed by the similar design of the side plates of both frames in a basic processing, which is not determined by this basic processing, whether it is side plates of the first or the second frame. This makes it possible to have all the components available with a comparatively small bearing holder in order to produce a casting tool within a short time, which is adapted to individual specifications. In the case of the described Although side plates are conceivable that some processing steps, such as the production of a groove for a sealant on the first frame or the preparation of connection holes for connection to a machine table or an adapter on the second frame still need to be carried out purpose-specific, but these steps are short-term to implement.

Similarly, it is advantageous if the corner segments of the first and the second frame with respect to the height of the corner segments in the joining direction, with respect to the cross section of the corner segments, with respect to the connection holes for connection to the side plates and / or the lifting lugs and / or of the material of the corner segments. Again, it is already advantageous if individual of these features match. The purpose and advantages are identical with the advantages mentioned in side panels of similar design. Even with the corner segments are thus beyond a common base machining of the corner segments of the first and second frame only minor adjustments required, for example, the insertion of a groove for a sealant to the corner segments of the first frame.

Also, the first and second mounting plates preferably conform to one or more properties, such as the dimensions of the mounting plates transverse to the joining direction, the thickness of the mounting plates, the connection holes for connection to the side plates and / or the moldings and / or with respect to the Material of the mounting plates. As a result, it is also achieved with regard to the fastening plates that extensive basic machining is possible without this being accompanied by a purpose of fixing the fastening plate as the first or second fastening plate. Possible adjustments that may be required beyond the basic processing are, for example, the Insertion of bullet holes on the first mounting plate or holes for ejector pins on the second mounting plate.

As already mentioned, the first frame can be provided for guiding the at least one first molded part. In such a case, the frame is sized so that there is a close clearance fit between it and the first mold part or parts. It is advantageous, however, if the first molded parts from the first frame with respect to a plane whose normal vector coincides with the joining direction, circumferentially spaced by at least 2mm. With such a design, the frame can not assume any guiding function as intended. The orientation of the at least one first molded part is therefore achieved solely by fixing it to the mounting plate. However, this is sufficient for a sufficiently accurately worked first mounting plate, so that can be dispensed with the leadership function of the frame. Therefore, the frame can be made larger in accordance with its free cross-section, so that a collision between the frame and the mold parts during the installation of the casting tool is prevented. Preferably, a circumferential distance of more than 2mm is provided, in particular more than 5mm, preferably even more than 20mm.

The first frame preferably extends in the joining direction in the direction of the second support part less than the summed thickness of the first and the second molded part. In a closed state of the mold in which the mold parts abut each other, therefore, the first frame rests only on the mounting plate to which it is attached, while it is at least slightly spaced from the second mounting plate. He therefore does not transmit any powers himself. The forces applied to the casting tool forces are therefore transmitted without exception or predominantly on the moldings themselves, so that these be pressed particularly close together. The height of the first frame is preferably dimensioned such that it is smaller by at least 0.2 mm, in particular by at least 0.3 mm, than the common thickness of the two molded parts. As mentioned above, it requires a sufficiently accurate positioning and design of the moldings no additional sealing.

Preferably, however, a peripheral seal is provided on the facing in the direction of the opposite support member side of the first frame, which rests circumferentially on the opposite support member in the closed mold. As a result, an additional protection is achieved, on the one hand prevents the ingress of dirt into the mold core tool and on the other hand represents an additional gas seal for the process step of fumigation in the production of sand cores.

With regard to the second frame, it is advantageous if it at least partially surrounds a lifting device which has at least one ejector pin extended in the joining direction, which can be inserted through an ejector bore in the second fastening plate and / or in the second molded part into the mold recess of the second molded part , This lifting device makes it possible to push out the produced workpiece or the manufactured core from the recess of the second molded part, wherein the arrangement of the preferably several ejector pins can be adapted individually to the shape of the workpiece or of the core. The lifting device is preferably operatively coupled to the first support member so that a spacing of the support members from each other in the course of demolding also an actuation of the lifting device and thereby causing extension of the ejector pins and thus ejection of the manufactured workpiece or core result. In principle, the inventive design of a casting tool can be used in casting tools, in particular core-forming tools, of any size. It is particularly preferred in casting tools in which a covered by the first and / or second frame surface whose normal vector coincides with the joining direction is at least 600mm x 600mm, preferably at least 1,000mm x 1,000mm. The design according to the invention is particularly advantageous in the case of such large tools, since the production methods of the prior art, in particular the casting production and the welding production of the molding boxes, are particularly disadvantageous in these tools since the respectively required post-processing and the negative effects of the thermal influences particularly high positional inaccuracy of the molded parts in operation result.

In a further development of the invention, the casting tool is characterized in that the first and / or the second frame at least partially made of a material having a tensile strength of at least 400N / mm ² , in particular of at least 450 N / mm ² , preferably the side plates and or the corner segments made of this material, and further preferably, the material is an aluminum alloy. The high tensile strength has been found to be advantageous in particular to ensure the position positioning of the molded parts during the manufacturing process safely. Preferably, all segments of the frame and preferably also the mounting plates are made of such a material. High-strength to very high-strength aluminum alloys have proven particularly suitable, for example EN-AW 7075. Especially with regard to such aluminum alloys which are difficult or impossible to cast or weld, the proposed design of the casting tool with a multi-segment frame is expedient. The invention further relates, in particular as a development of the above-described design, a generic casting tool, wherein the first support member and / or the second support member has a mounting plate to which the molded part attached thereto is attached and at least on its side facing the molding completely flat. Preferably, this side is ground flat. As already explained above can be dispensed with the first frame, even if it is not recommended. By using particularly flat mounting plates, so of mounting plates whose tolerance is less than 0.2mm with respect to the flatness, preferably below 0.1 mm, it can be achieved that the seal on the moldings itself is already sufficient to a gas outlet during the gassing to avoid. The high manufacturing accuracy can be achieved in particular by the surface grinding of the respective mounting plate and the contact surfaces of the moldings, wherein subsequently no thermal joining method should apply, so as not to affect the high accuracy of the surface ground surface.

Although it is possible to dispense with the first frame, it is advantageous if such a first frame is provided, which preferably corresponds to the first frame described above. Alternatively, however, it is also possible to provide a one-piece frame. Such a one-piece frame may be made by casting or welding. It preferably has four mutually cohesively connected side portions, which surround a space in which, for example, can be arranged to be fixed to the mounting plate moldings.

The frame is preferably fastened to the mounting plate by means of releasable, positive locking connection means so that it can be removed for alignment purposes to allow better accessibility of the mold parts. The form-fitting acting In addition, connecting means cause the flat-ground fastening plate not to be distorted by a thermal joining process.

The invention further relates to a core forming machine with a casting tool in the form of a core forming tool according to the above description. Such a core forming machine is equipped with a feeding device by means of which sand can be injected under high pressure into the moldings.

Brief description of the drawings

Further aspects and advantages of the invention will become apparent from the claims and from the following description of a preferred embodiment of the invention, which will be described below with reference to FIGS.

Fig. 1 shows a complete inventive casting tool in the form of a core mold in an exploded view.

2a to 2f shows a sectional view of the core mold according to Figure 1.

Fig. 3 shows a partially sectional view of a frame of the core tool according to the preceding figures.

Detailed description of the embodiments

FIG. 1 shows an inventive casting tool in an exploded view. This casting tool is a core mold, which comprises the following main components, which are explained in the order from top to bottom below.

A first mounting plate 10 forms on the upper end of the core molding tool. A first frame 20 can be screwed thereto by means of screws, not shown, so that the first fastening plate 10 and the first frame 20 are connected together to form a first, upper support part 10, 20 for molded parts 30 can. In this formed from the first mounting plate 10 and the first frame 20 downwardly open molding box a total of four mold tops 30 are attached. These upper mold parts 30 each have a mold recess 33, not shown in FIG. 1, wherein the four mold recesses 33 of the mold top parts 30 together with corresponding upwardly open mold recesses 43 of four corresponding mold bottom parts 40 each form a closed cavity, which forms a negative mold represent each produced by means of the core mold core. The four mold bases 40 are provided for attachment to a lower, second mounting plate 50, on the underside of which a second frame 60 is secured. At the bottom of the second frame 60, an adapter plate 70 connects, which is provided for fixing the core mold on a machine table. Within the second frame 60, a lifting plate 80 is arranged, which has a plurality of vertically extended Auswerferstifte 82, corresponding to their positions in the lower mounting plate 50 and in the mold parts 40 holes 52, 42 are provided through which the Auswerferstifte 82 into the cavity 33, 43 formed by the upper mold parts 30 and the lower mold parts 40 can be driven into it.

In detail to the mentioned components: The upper mounting plate 10 has a thickness of 30mm and width and length of 1,400mm each. The mounting plate is ground flat both at its upper side 10a and at its lower side 10b, wherein the maximum deviation from the flatness is 0.05 mm in each case and the parallelism of the upper side 10a and the lower side 10b also amounts to a maximum of 0.05 mm. The upper mounting plate 10 is made of steel 1.2312 / 2080, which is not pourable, but is used for the concrete application as a prefabricated plate with a predetermined thickness, which has been edited only by milling in terms of their external dimensions. At the outer edges of the upper mounting plate 10, a plurality of connecting holes 11 is provided circumferentially, which serve the releasable connection of the mounting plate 10 with the frame 20. On the mounting plate 10 connecting holes 14 are also provided for fixing the upper mold parts 30. Furthermore, a plurality of extending in the joining direction 2 bullet holes 12 are provided, which break through the upper mounting plate 10 and which serve the shooting of the casting material, in this case the shot of sand. Furthermore, guide bores 15 are provided, which serve to guide a nozzle plate, not shown, as well as a non-illustrated squeeze plate.

Very similar to the upper mounting plate 10, the lower mounting plate 50 is formed. Its thickness of 30mm and its width and length of 1,400mm each agree with the upper mounting plate 10 via. Also in accordance with the upper mounting plate connecting bores 51, 54 are provided in the edge regions or in the center of the second mounting plate 50, which serve in the case of the second mounting plate of the connection to the second frame 60 and with the mold bottom parts 40. The material of the mounting plates 10, 50 is also the steel 1.2312 / 2080. Notwithstanding the first mounting plate 10, the above-mentioned drilling ments 52 provided in the lower mounting plate 50 for the Auswerferstifte 82. The mounting plates 10, 50 thus agree with respect to all features with the exception of the bullet holes 12 and the bores 52 for the Auswerferstifte 82 match.

This allows the mounting plates 10, 50 largely finished, but still without the bullet holes 12 and without the holes 52, vorzuhalten in a camp, without this basic processing already brings a determination of the ultimate purpose of the mounting plate with it.

The upper frame 20 consists of a total of eight segments, which are shown separated from each other in Fig. 1 for better understanding. When frame 20 are each opposite side plates 22 and side plates 24 as the main segments use, which are connected to each other via corner segments 26. The side plates 22 are unprocessed plates which have been machined to the desired height of 210 mm and the desired length of 1100 mm, for example only by means of milling. The other side plates 24 differ from this only in that on the outer side in the upper region a groove 24a has been incorporated by milling. This groove 24a forms after attachment of the frame 20 to the upper mounting plate 10 has an engagement channel, by means of which a storage or handling of the support member consisting of mounting plate 10 and frame 20 is simplified. The side plates 22, 24 also each have connecting holes 21 on its upper side, which are arranged to connect the mounting plate 10 with the frame 20 corresponding to the connecting holes 11 of the upper mounting plate 10. The side panels 22, 24 are connected by the total of four corner segments 26, which are each manufactured as a section of a strand profile and having an outer recess 26a. The side plates 22, 24 have connecting bores at the end for connection to the corner segments 26, correspondingly provided in the recess 26a of the corner segments 26 in the direction of the side plates 22, 24 aligned connection bores. These holes in the side plates 22, 24 and in the corner segments 26 allow the segments 22, 24, 26 in a simple and fast manner to connect to each other to the overall frame 20. The design with the outer dimensions of the frame 20 significantly influencing side plates 22, 24 allows an easy adjustment of the size of the frame 20 to specific requirements, especially in terms of size. The product range of a manufacturer of core molding tools according to the invention preferably comprises frames which can be supplied oriented to fixed grid dimensions of various sizes, the step size in the two main directions of extension of the frames preferably being 100 mm, so that the manufacturer only has to provide a few types of side plates to be able to deliver any size quickly within the limits of the defined grid dimensions. The segments 22, 24, 26 are invariably also made of the difficult to cast aluminum alloy EN-AW 7075 and therefore comparatively light.

The lower, second frame 60 corresponds largely to the upper, first frame 20. It is also composed of corner segments 66 and side plates 62, 64, wherein all with respect to the frame 20 mentioned features are realized identically. One difference is that the side parts 62, 64 of the lower frame 60 additionally have connecting holes 63 which are formed as downwardly open blind holes with a thread and serve to fix the lower frame 60 to the adapter 70, which in turn fixed to the machine table can be. These connecting holes 63 exemplarily illustrated in FIG. 1 by only one connecting bore 63 are not required in the upper frame 20. The upper frame 20 instead has a circumferential groove 23 which extends along the side plates 22, 24 and along the corner segments 26 and which serves to receive a sealant such as a sealing cord, the purpose of which will be explained below. Another difference between the frames 20, 60 is that in the recesses 66a of the corner segments 66 lifting eyelets 68 are screwed. These lifting lugs 68 and a fastening ring 69 provided thereon are arranged by their recessed attachment to the corner segments 66 in the illustrated state such that they do not collide with the escape of the outer surfaces of the side plates 64, 62 and thus not defined by the outer dimensions of the frame base protrude.

Thus, with respect to the frame 20, 60, the vast majority of features in both frames are equally realized, so that there is also the possibility vorzuhalten the side panels and the corner segments in a basic form, without this basic processing of a determination with respect to the specific purpose of use brings. Instead, it may be determined on a case by case basis by the preparation of the connection holes 63 and the holes for the lifting lugs 68 and the circumferential groove 23, as the side plate or the corner segment to be used.

Laying down on the upper mounting plate 20, the above-mentioned upper mold 30 are provided, which have connection holes 34, by means of which they can be screwed with the aid of the connection holes 14 in the upper mounting plate 10 at this. Furthermore, the upper molds 30 have shot holes 32, which are arranged corresponding to the bullet holes 12 in the upper mounting plate 10. The upper connection surfaces 30a of the upper mold parts 30 are machined with the same accuracy as the lower side 10b of the mounting plate 10, for example flat ground, so that the mold Upper parts 30 with respect to the joining direction 2 relative to the mounting plate in the bolted state have a highly accurate positioning.

Analogous to the upper mold parts 30, the lower mold parts 40 are formed. These also have on their side facing in the direction of the mounting plate 50 side 40b connecting holes 44 for attachment to the lower mounting plate 50 by means of there correspondingly provided terminal holes 54. Instead of the bullet holes 32, however, the already mentioned holes 42 are provided for the ejector pins 82 in the lower mold parts 40. As with the upper mounting plate 10 and the upper mold parts 30, the lower sides 40b of the lower mold parts 40 are machined with the same precision as the upper side 50a of the lower mounting plate 50 for exact positioning in the joining direction 2.

The last essential component is the lifting plate 80 with the ejector pins 82. This lifting plate 80 is not fixed to any of the described components. It can be lifted by a mechanism, not shown separately relative to the lower support member 50, 60, so that after separation of the upper support member 10, 20 from the lower support member 50, 60 for the purpose of demolding by a common upward movement of the lifting plate 80 and the Auswerferstifte 82 a pressing out of the then lying in the mold cavity 43 core is possible.

FIGS. 2a to 2f show the composite core forming tool of FIG. 1 in a simplified production process of sand cores. From Figure 2a, the state in the preparation of the core mold can be seen. For this purpose, the upper frame 20 is removed in advance, so that the support member only consists of the mounting plate 10 which is connected in a manner not shown with a lowerable lifting device, not shown, which is provided with connections for feeding sand as core casting material. The upper mounting plate 10 is lowered together with the mold upper parts 30 until the mold tops 30 rest with their flat-ground bottoms 30b in the correct orientation on the likewise ground flat top surfaces 40a of the mold parts 40. If there is still an offset transversely to the joining direction 2, this can be compensated in the illustrated stage, for example by a displacement of the upper mounting plate 10 relative to the lowerable hood, not shown, or by a displacement of the upper mold parts 30 and the lower mold parts 40 relative to the respective Fixing plate 10 or 50. After the correct alignment is ensured by this, the upper mounting plate 10 is raised together with the mold upper parts 30 so far that subsequently the frame 20 can be attached to the upper mounting plate 10.

The state achieved after attachment of the frame is shown in FIG. 2b. This state represents the initial state for the subsequent manufacturing process of the sand cores. The described alignment can be carried out as part of the manufacturing process already at the manufacturer or alternatively take place directly on a core forming machine whose relatively height-adjustable hood can serve as a lifting device in this case.

Starting from the state of FIG. 2b, the actual manufacturing process for the production of sand cores begins. For this purpose, first the upper support member, consisting of the upper mounting plate 10 and the upper frame 20, lowered until the lower sides 30 b of the Molded tops 30 come again on the tops 40a of the mold parts 40 to rest. In this state, which is shown in Figure 2c, the lower end faces of the frame 20 do not touch the lower mounting plate 50, but are still spaced from it by about 0.5mm. Due to the circumferential sealing cord 27, which is inserted in the groove 23, a gas-tight closure of the space formed by the upper mounting plate 10, the lower mounting plate 50 and the frame 20 is still made. In this state, a holding force of 60OkN is applied to the lower frame 60, which is almost completely introduced via the upper mold parts 30 and mold lower parts 40 from the upper support member 10, 20 in the lower support member 50, 60, so that the mold parts 30, 40 firmly against each other be pressed. The proportion of this force, which is passed to the mold parts 30, 40 passing through the frame 20 directly into the lower mounting plate 50 is very low.

In this state, which is loaded with 60OKN, the pressurized sand is injected through the corresponding holes 12, 32, so that the state shown in FIG. 2d is established, in which the mold recesses 33, 43 of the molded parts 30, 40 are completely filled with sand. In order to ensure the escape of the air previously located in the mold recesses 33, 43, additional vents may be provided. Subsequently, sand residues are leveled in the holes 32 by a respective non-illustrated squeegee. For solidification of the sand, the sand volumes, which up to this time have not yet been connected to a solid body, are subsequently gassed in mold cavities 33, 43, wherein this can be done through the injection openings 12, 32 or separate gassing openings provided for this purpose. The gas can, with sufficiently accurate orientation of the mold parts 30, 40, the mold recesses 33, 43 by annular gaps between the walls of the bores 42, 52 and the therein Auswerferstiften 82 or by specifically here- leave for intended degassing. In any case, it is ensured that the complete volumes are supplied with gas, so that solidification of the sand into solid sand cores 90 results in homogeneous form. Even if the mold parts 30, 40 are not sufficiently exactly to each other to completely prevent the escape of the gas through the dividing gap between the mold parts 30, 40, a complete fumigation is nevertheless guaranteed, since the leakage only causes the space around the Moldings 30, 40 is filled with the gas. However, escape from this space is not possible due to the frame 20 and the sealing cord 27.

After the fumigation has been completed, the gas is flushed out. Subsequently, the upper support member 10, 20 is raised together with the mold upper parts 30, wherein the sand cores 90 initially remain in their position in the mold recesses 43 of the mold parts 40. Only after completion of the upward movement of the upper support member 10, 20 and the mold tops 30, shown in Figure 2e, the lifting plate 80 is raised so that the ejector pins 82 penetrate into the Formausneh- 43 of the mold parts 40 and the sand cores 90 lift.

This results in the state of Figure 2f, which allows the automated or manual removal of the sand cores.

FIG. 3 again shows a section through the core mold according to the invention. It is a partially sectional view of the frame 20, wherein the frame 60 is constructed in the manner described above almost identical. It can be seen how the corner segments 26 are connected to the side plates 22, 24 via the end-side screw connections. The contact surfaces on the side plates and / or on the corner segments, which are precisely produced, for example, by milling, ensure that the frame has exactly the desired size. Has ße, without the need for an adapted mold must be created or a complex welding process with complex post-processing phase is needed.

Claims

claims

1. casting tool for the production of cast products, in particular of cores (90) for sand casting products, of die cast products and Kokillengussprodukten, comprising a support device consisting of a first and a second support member (10, 20, 50) in a joining direction (2) towards each other are movable, at least two mold parts (30, 40), of which in each case a first mold part (30) on the first support member (10, 20) and a second mold part (40) on the second support member (50, 60) is fixed, wherein the molded parts (30, 40) each having a mold recess (33, 34), wherein the mold recesses (33, 34) of the mold parts (30, 40) together define the shape of at least one workpiece to be produced (90) when the first and the second mold part ( 30, 40) abut one another, characterized in that one of the supporting parts (10, 20) has a first peripheral frame (20) surrounding the said molded part (10, 20) fixed to the molded part (30), wherein the frame (20 ) as a multi-segment frame from m at least two frame segments (22, 24, 26) is composed, which are connected to each other via positively acting connection means.

2. casting tool according to claim 1, characterized in that the casting tool is formed as a core mold for the production of cast cores (90).

3. casting tool according to claim 1 or 2, characterized in that the first peripheral frame (20) is part of the first support member (10, 20).

4. Casting tool according to one of the preceding claims, characterized in that the first support part (10, 20) has a first fastening plate (10) on which the first support part (10, 20) fixed to the molded part (30) is attached and to the the first frame (20) is attached.

5. casting tool according to claim 4, characterized in that the first frame (20) by means of releasable, positively acting connection means to the first mounting plate (10) is attached.

6. casting tool according to one of the preceding claims, characterized in that the second support member (50) has a second mounting plate (50) to which the second support member (50) fixed to the molded part (40) is attached.

7. casting tool according to claim 6, characterized in that the second support member (50, 60) has a second circumferential frame (60) which is fixed to the said first mold part (30) facing away from the second mounting plate (50).

8. casting tool according to one of the preceding claims, characterized in that the first frame (20) and / or the second frame (60) in each case has four side plates (22, 24, 62, 64) oriented at right angles as main segments, which directly or indirectly via intermediate segments, in particular corner segments (26, 66) , are interconnected.

9. casting tool according to claim 8, characterized in that two opposite side plates (24, 64) have outer recesses (24a), preferably recesses on an upper edge of the side plate (24, 64).

10. casting tool according to claim 8 or 9, characterized in that the corner segments (26) as in the joining direction (2) extended profile sections, in particular continuous casting profile sections are formed.

11. Casting tool according to one of claims 8 to 10, characterized in that at least two opposite corner segments (66), preferably at all four corner segments (66), lifting lugs (68) are mounted, wherein the lifting lugs (68) each formed and are attached that they do not project beyond the alignment of the respective corner segment (66) adjacent side plates (62, 64).

12. Casting tool according to one of the preceding claims, characterized in that at least one of the following features is realized: the side plates (22, 24, 62, 64) of the first and second frames (20, 60) are consistent with respect to the following characteristics:

Height of the side plates (22, 24, 62, 64) in the direction of the joining direction (2) and length of the side plate (22, 24, 62, 64) transversely to the joining direction (2), thickness of the side plates (22, 24, 62, 64 ), Connecting bores (21, 61) for connection to other side plates, the corner segments (26, 66) and / or a fastening plate (10, 50) and / or material of the side plates (22, 24, 62, 64), the corner segments ( 26, 66) of the first and second frames (20, 60) are consistent with respect to the following properties:

Height of the corner segments (26, 66) in the joining direction (2), cross-section of the corner segments (26, 66), connecting bores for connection to the side plates and / or the lifting eyes, material of the corner segments (26, 66), the first fastening plate (10) and the second attachment plate (50) are consistent with respect to the following properties:

Dimensions of the mounting plates (10, 50) transversely to the joining direction (2),

Thickness of the fastening plates (10, 50), connecting bores (11, 14, 51, 54) for connection to the side plates (22, 24, 62, 64) and / or the molded parts (30, 40) and / or material of the fastening plates ( 10, 50).

13. Casting tool according to one of the preceding claims, characterized in that the first molded part (30) of the first frame (20) with respect to a plane whose normal vector coincides with the joining direction (2), circumferentially spaced at least by 2mm.

14. casting tool according to one of the preceding claims, characterized in that the first frame (10) in the joining direction (2) in the direction of the second support member (50, 60) extends less far than the first and the second mold part (30, 40) in flush with each other state.

15. casting tool according to claim 14, characterized in that on the in the direction of the opposite support member (50, 60) facing side of the first frame (20) a circumferential seal (27) is provided, which circumferentially on the opposite support member (50, 60) abuts when the mold parts (30, 40) lie flush against each other.

16. Casting tool according to one of claims 7 to 15, characterized in that the second frame (60) at least partially encloses a lifting device (80, 82) which has at least one in the joining direction (2) extended ejector pin (82) by a Ejector bore (52, 42) in the second mounting plate (50) and in the second mold part (40) can be inserted into the mold recess (43) of the second molded part (40).

17. Casting tool according to one of the preceding claims, characterized in that the first and / or the second frame (20, 60) in a plane whose normal vector coincides with the joining direction (2), a Area of at least 600mm x 600mm covers, preferably an area of at least 1000mm x 1000mm.

18. casting tool according to one of the preceding claims, characterized in that the first and / or the second frame (20, 60) at least partially made of a material having a tensile strength of at least 400N / mm ² , in particular of at least 450N / mm ² , wherein preferably the side plates (22, 24, 62, 64) and / or the corner segments (26, 66) are made of this material, and preferably wherein the material is an aluminum alloy.

19. casting tool according to the preamble of claim 1 or one of the preceding claims, characterized in that the first support member (10, 20) and / or the second support members (50, 60) has a mounting plate (10, 50), on which the Attached thereto molded part (30, 40) is attached and the at least on its the molding (30, 40) facing side (10b, 50a) is completely flat, preferably flat ground, is.

20. Casting tool according to claim 19, characterized in that on the mounting plate (10, 50) a peripheral frame (20, 60) is fastened by means of releasable, positively acting connection means.

21. Casting tool according to claim 20, characterized in that the frame (20, 60) as a multi-segment frame (20, 60) is formed or formed as a one-piece encircling frame.

22. Core forming machine, characterized in that it comprises a core forming tool according to one of claims 2 to 21.