DE102009033402A1 - Mold insert for a casting core and / or a casting mold and casting core and / or casting mold with a mold insert - Google Patents

Abstract

A mold insert (10) for a casting core (100) and / or for a casting mold for the production of components (1) made of casting metal, which are to be provided with small and / or narrow cavities (5), has a concave cross section that is rectangular or convex base body (20) which has at least one contact area (22) to the casting metal and at least one contact area (24) to the casting core (100) and / or to the casting mold. In order to enable the small to very small cavities or recesses in the cast parts (1) to be formed in a cost-effective and reliable manner, it is provided that the base body (20) is made of a fiber and / or yarn-containing material. The fibrous material is preferably cardboard, cardboard, paper, nonwoven, nonwoven or felt, while the yarn-containing material is a woven, knitted or knitted fabric. The fiber and / or yarn-containing material can also be mixed and / or impregnated with a binder. Openings (30) are provided in the contact areas (24) to the casting core (100) and / or to the casting mold. In order to increase the stability of the molded insert (10), the base body (20) can be constructed in several layers, with a reinforcement (40) being arranged between the layers. At least one tab (50) formed on the base body (20) can serve to remove the molded insert (10) from the component (1).

Description

The The invention relates to a mold insert for a casting core and / or a mold according to the preamble of claim 1. The invention further relates to a casting core for the production of components from cast metal with a mold insert according to claim 13 and a casting mold according to claim 18.

to Production of components from cast metals with inside or External contours are usually used Permanent or lost forms, possibly with inside or outside lying casting cores. Lost cores will be made of sand in Core boxes made. These are with appropriate mold cavities provided, in which filling openings open, over which filled the mixed with a binder sand becomes.

To following the pouring of the sand mixture into the core box the curing. Then it will be in itself dimensionally stable casting core removed from the core box and - if necessary together with other casting cores - in a permanent form or lost form, which in the subsequent casting process with a flowable metal, namely an iron or non-ferrous alloy is filled.

To the solidification of the casting metal, the component of the Removed casting mold and freed from the sand if necessary. then Cleaning removes any mold residue. The finished end product now has the desired shape on.

A Such shaping can for example have a cavity structure. An example of this is the cooling water jacket a reciprocating internal combustion engine. Their cylinder block (cylinder crankcase) Has one or more cylinder bores that are from cylinder walls are limited. To have a compact design of the engine to reach, one chooses small cylinder distances, so that the cylinder walls of adjacent cylinders touch. However, these areas called webs are no longer from Coolant flows through, causing thermal problems can lead. For this reason, therefore, usually a cooling also necessary between the contacting cylinders, in particular in the upper region of the combustion chamber of the cylinder, d. H. at the top dead center of the piston sliding in the cylinders.

Around To achieve this, one has introduced holes in the cylinder webs. However, these have too small a flow cross-section on. In addition, caused by the circular cross-section the holes, locally too thin a cylinder wall, the at high Zünddruck- and temperature load for cracking can tend.

In DE-A1-33 00 924 It has been proposed to pour tubes into the cylinder bars which are intended to establish a connection between the lateral cooling water jackets of the cylinder block. The problem here is that the pipes must be pre-machined at the ends and sealed during casting. In addition, the tubes are cut by the cylinder bores, so that within the cylinder different materials with different material and surface properties are present, which is highly problematic.

EP-A1-0 197 365 forms the cooling water channels in the cylinder webs with separate core webs, which connect the two opposite longitudinal sides of the water jacket core in height of the cylinder combustion chamber. Irrespective of the jacket core, the core webs are formed from highly compressed zircon sand in order to obtain the necessary strength, and then fitted in the casting core. The disadvantage here is that the core webs break easily in the formation of very narrow channels, which can lead to damage to the casting. Moreover, the use of zircon sand entails high costs, because the material is relatively expensive and a separate tool is necessary for the production of the core webs.

On off DE-C2-38 28 093 known casting core for the water jacket of a cylinder block used for the production of cooling water channels in the cylinder webs separate supports in the form of rectangular plates of sintered oxide ceramic. Each ceramic plate is provided at its in the installed state parallel to the cylinder axes edges with triangular edge beads in cross-section, which should be anchored in core shooting in the water jacket core. The disadvantage of this is that the production of ceramic supports is very expensive, because the necessary materials and tools are relatively expensive. Another problem is that the ceramic material is very resistant, whereby the columns are not destroyed reliably during the casting process. Then, however, the remnants of material can not be easily removed when cleaning the component.

Another disadvantage of dating DE-C2-38 28 093 known casting cores is that the ceramic plates touch the casting metal at numerous points. Casting on ceramic, however, can lead to a quenching effect on the casting material, which can form a different material structure in the contact areas. This in turn often leads to tensions within the finished component or to machining problems.

DE-A1-198 32 718 envisages the use of separate core carbon parts for the formation of smaller voids in castings, which are burned out after the casting process with the supply of oxygen. The core parts are designed as graphite plates. They are arranged as bridges in the mold cavity of the cylinder bore intermediate wall and formed with their thickened ends when shooting the sand mixture into the casting core. The disadvantage here is that the production of graphite plates is complicated and expensive. In addition, the graphite plates must be burned out by an additional step. This requires additional equipment, which has an unfavorable effect on the production costs. Regardless of all, graphite plates are very problematic to handle because they can easily break, especially when the thickness of the plate is 0.5 to 2 mm.

aim The invention is to overcome these and other disadvantages of the prior Technology to avoid and a mold insert for a mold and / or to create a casting core for the Training of small to very small cavities or Recesses in castings is suitable. The mold insert should be simple and cost-effective and easy to handle, in particular, the risk of breakage in thickness dimensions smaller 2 mm is significantly reduced. The mold insert should be further as a lost molding quickly and easily from the finished component have it removed.

One Another important object of the invention is a casting core and / or a mold for the production of To create components made of cast metal, the or next to larger cavities also for the training of small to very small cavities or recesses in castings is suitable. The casting core or the mold should be simple and inexpensive be constructed and easy to handle, as well as after the casting process be complete and easy to remove. The aim is Furthermore, a possible free design of the components, in particular with narrow or narrow cavities, channels, Recesses or contour areas.

main features The invention are in the characterizing part of claim 1 and in claims 13, 18, 19 and 20. refinements are the subject matter of claims 2 to 12 and 14 to 17.

at a mold insert for a casting core and / or a mold for the manufacture of components made of cast metal, with small and / or narrow cavities to be provided, with a body, at least a contact area to the casting metal and at least one Contact area to the casting core and / or to the casting mold has, the invention provides that the main body is made of a fiber and / or yarn-containing material.

The Use of fiber and / or yarn-containing material allows the production of mold inserts, which are inside the casting core and / or within the mold, an almost arbitrary shape can have. In particular, product-related can be Realize shapes and contours with the usual Manufacturing processes and materials in the foundry industry were not possible. The mold inserts can be due to the inherent elasticity of the fiber and / or yarn-containing material - ever after application - form extremely thin, so that within a cavity structure extremely small and / or narrow Cavities arise, but without the risk that form cracks or breakages within the mold inserts. Thereby can not create burrs within the component to be produced or damage resulting in rejects or which later removed in a costly aftertreatment Need to become.

One Another advantage of the mold inserts according to the invention is that these compared to conventional Ceramic supports or core parts extremely can be manufactured inexpensively. In addition are for the production and handling of the invention Mold inserts no more expensive machinery or equipment more necessary. The material used rather ensures that the Mold inserts with sufficient strength and in such a stable Form that they are always firm and accurate in the Foundry core and / or incorporated into the mold are.

The Mold inserts according to the invention can for example, in the formation of a cooling water jacket in an engine block of a reciprocating internal combustion engine application find, by means of the mold inserts in the narrow cylinder webs extremely thin channels between the cylinder bores be formed, for example, a width of less than 1.5 mm have. This allows the use of mold inserts made of fiber and / or yarn-containing material to the engine designer the formation of a web cooling at optimally remaining Cylinder wall. Moreover, the waterbridge can be without the usual draft are formed, what the clear cross-sectional area of the trainee channel further increased.

at the fibrous material is cardboard, cardboard, paper, Fleece, nonwoven or felt, while the yarn-containing material a fabric, a knit or a knit is. Leave these materials not only cost-effective in optimal quality procure, including the processing into product-related form deposits is easy and low cost possible.

The made of cardboard, cardboard, paper, non-woven, non-woven or felt Material may be before the final shaping and / or the Integration in a casting core and / or a casting mold mechanically, thermally or chemically solidified, so that the Mold insert sufficient strength and inherent stability exhibit.

The fiber and / or yarn-containing material may consist of ceramic, glass or carbon fibers, resulting in further applications and applications be opened.

A important embodiment of the invention provides that the fiber and / or yarn-containing material mixed with a binder and / or is soaked. The mold insert can be characterized curing in a predetermined form, if necessary in one step with the curing of the casting core and / or the casting mold. The shape of the mold insert can within the core box, within the mold or separately. The binder can dry, moist, liquid or gaseous be.

One An essential advantage of the invention is that within the component precise contours with very small dimensions can be generated, the self-strict tolerance requirements suffice. At the same time the risk of breakage conventional ceramic supports or core parts clearly reduced, which is favorable to the component function, the Quality and the economy of the pouring Affects components.

From Another advantage is that provided for the mold inserts Materials and for the production of the casting core and / or the possibly lost mold used sand similar have thermal properties, so that the casting metal not quenched in the contact areas with the mold inserts becomes. The structure of the casting metal remains thereby unchanged homogeneous, which is favorable to the quality affects the components.

One Another advantage of the invention is that the mold inserts the shrinkage occurring during the solidification process of the component is not hindered. In the component can therefore no additional tensions arise.

The The invention further provides that the base body is coated is, for example, with a conventional heat-resistant or refractory material. As a result, the mold insert remains up to Solidification of the surface of the molded component dimensionally stable receive.

A Development of the invention provides that the contact area of the Basic body to the casting core and / or to the casting mold is provided with at least one breakthrough. This will make the sand volume the casting core or the casting mold on both sides the mold insert connected. The casting core and The mold insert thus form a solid bond, the local not weakened.

Of the Basic body of the mold insert can according to a another aspect of the invention be formed one or more layers, wherein the individual layers or layers of a uniform Material or of different fiber and / or yarn-containing materials can exist.

Around can further increase the strength of the mold inserts the main body have a reinforcement, the z. B. between the individual layers of the base body is arranged. In Consider, for example, a perforated plate or a wire mesh, the firmly integrated into the mold insert.

The Use of cardboard, cardboard or paper or not by others heat resistant materials made of fleece, nonwoven or Felt for the training of the mold insert has further the Advantage that these materials after the solidification of the casting metal in the mold together with the binder as far as possible charred and swiftly out during cleaning can be removed from the finished component. The mold insert leaves a clean, burr-free opening cross-section, for example, as a cooling channel in the upper cylinder area of a Internal combustion engine may be formed. The same applies the yarn-containing fabric, knitted or knitted fabric, if it is not heat- or fire-resistant. The material charred during the casting process and can be easily removed from the component become.

Chooses one, however, for the mold insert a material that heat or fire resistant fibers and / or yarns, so the deposit loses after the solidification of the casting metal its own stability, but not its cohesion. The mold insert can now with a gripping tool from the contour area of the component are removed. Again, this creates a cavity which is clean and burr-free and no post-processing more needs.

Around to facilitate the extraction of the mold insert from the finished component, is the basic body expedient with a Provided tab, which is easily accessible and, for example, in the Free space of the mold protrudes. The tab can be tight connected to the main body of the mold insert or with this one piece.

It is for the design of a small and / or narrow contour in the component to be cast expedient if the base body of the mold insert is rectangular, concave or convex in cross section. For example, one can form the base body on one or both sides in cross-section at least partially contour embossed, for example, wedge-shaped, which in a Zylinderstegkühlung in terms of flow conditions can be beneficial.

The Invention further provides the use of the invention Mold insert in a casting core, in particular for the production of components from cast metal with tight or narrow contour areas.

The Mold insert is preferably force and / or positive fit integrated in the main body of the casting core, wherein the basic body of the mold insert, for example, in the casting core is shot. These are the freestanding contact areas the mold insert to the casting core during the filling process of the core box completely surrounded by core sand and by this included, the binder of the sand a solid Bond between the mold insert and the casting ensures.

alternative can the mold insert even after the core shooting in the Casting core can be used and mechanically, by means of a Glued or secured by means of an additional potting compound become.

One For example, a casting core produced in this way can be used As a water jacket core the entire contour area for the Water cooling of the cylinder tubes of an internal combustion engine form. The mold inserts can be part of a form completely assembled core unit. The latter can be the whole Internal, possibly also outer contour of a cylinder crankcase to shape.

One Another aspect of the invention provides that the main body of the casting core and which integrate in the casting core Mold inserts are coated, for example with a conventional heat resistant or refractory material. Stay that way the casting core and the mold insert until the surface solidifies the molded component obtained dimensionally stable. Through a common Coating of casting core and mold insert creates a uniform, self-contained surface.

Important is that the mold inserts and the casting core a solid and form a stable unit, which forms a corresponding mold can be used. Accordingly, the invention provides further a mold for the production of components made of cast metal before, which - in the case of a lost Form - a body of sand or - in Trap of a permanent form - a basic body Metal has. In the body can a Mold insert and / or a casting core arranged and / or integrated be.

With Advantage, the invention further provides the use of a mold insert for producing a casting core. Further claimed the invention the use of a casting core and / or a Casting mold with a mold insert for producing a component made of cast metal.

Further Features, details and advantages of the invention will become apparent the wording of the claims and the description below of embodiments with reference to the drawings. Show it:

1 a partial sectional view of a cylinder block of an internal combustion engine,

2 a partial sectional view of the cylinder block of 1 at the level of line II with a closed bridge,

3 a partial sectional view of the cylinder block of 1 at the level of line II with a water gap formed between two cylinder bores,

4 a side view of a mold insert,

5 a side view of another embodiment of a mold insert,

6 a side view of another embodiment of a mold insert,

7 an exploded oblique view of yet another embodiment of a mold insert,

8th a longitudinal section through a mold insert, and

9 a partial sectional view of the cylinder block of 1 at the level of line II with not yet removed casting core and core element.

The in 1 generally with 1 designated cylinder block is provided for a (not shown) reciprocating internal combustion engine. It is a component which is cast in an iron or non-ferrous alloy casting mold (also not shown).

The cylinder block 1 has an outer wall 2 and a plurality of, for example, arranged in series cylinder bores 3 that of cylinder walls 2 ' are limited between the outer wall 2 and the cylinder walls 2 ' is a cavity 4 ausgebil det, which is traversed during operation of the engine of cooling water, which dissipates the heat generated during combustion. Further recesses 6 can also call the cavity called a water jacket 4 connect with corresponding cavities in a (not shown) cylinder head, by means (not shown) screws with the cylinder block 1 is firmly screwed. To receive the screws are in the cylinder block 1 threaded holes 7 educated.

The cylinder walls 2 ' make up - like 2 shows closer - between two cylinder bores 3 narrow bars 8th , wherein the width B of the webs 8th can be relatively narrow in favor of a compact design of the engine.

To thermal problems, especially in the upper area of the cylinder bores 3 , ie in the region of the top dead center of the piston sliding in the cylinders to avoid, is - as in 3 shown - in every jetty 8th a narrow cavity 5 or a water bridge formed, which in the water jacket 4 flowing water allows, even between the cylinder bores 3 to flow through, in this way, the cylinder walls 2 ' in the narrow bridge areas 8th to cool.

The width b of the water bridges 5 is between 0.5 mm and 3 mm. It is thus significantly smaller than the width B of the webs 8th , so the stability of the cylinder block 1 despite the narrow bars 8th or the compact design of the engine is not affected. The (not shown) height of the water bridges 5 is adapted to the respective component requirements so that sufficient water can always flow through it. Within the water jetties 5 If required, material bridges can be incorporated which have a stabilizing and / or water-deflecting effect.

For the training of in the cylinder block 1 provided water jacket 4 becomes a casting core 100 used (see 9 ) which is inserted into a mold (not shown). The casting core 100 consists of a suitable core sand, which is provided with a binder. It is produced in a manner known per se in a core box (not shown) by means of a core shooting machine (also not shown).

For the training of between the cylinder bores 3 trained narrow water bridges 5 are inside the casting core 100 Shaped inserts 10 placed exactly in the middle of the bars 8th and positioned at a suitable height and aligned so that after the casting process and after removal of the casting core 100 and the mold inserts 10 within the component 1 the desired cavity structure 4 . 5 is trained.

The mold insert 10 has - like the 6 shows closer - a basic body 20 which has a contact area in the middle 22 having the casting metal. This contact area 22 for example, through the lines 23 . 23 ' limited, ie between the lines 23 . 23 ' is the mold insert 10 after filling the mold with the casting metal in contact.

On both sides of the contact area 22 to cast metal, the basic body 10 each a further contact area 24 on, with which the mold insert 10 in the casting core 100 is involved. This and the mold inserts 10 thus form a composite body that can be used as a prefabricated unit in the mold. If necessary, the composite body 100 . 10 be provided with a coating, such as a core size.

So every mold insert 10 always reliable in the casting core 100 is involved and so that the sand can connect to both sides of the mold insert, are in the contact areas 24 of the basic body 10 breakthroughs 30 brought in. These can - as in the embodiment of 6 shown - to be trained. But you can also have a different shape. The important thing is that the mold inserts 10 precise and reliable in the casting core 100 are embedded.

A first embodiment of the invention provides that each basic body 20 the mold inserts 10 is made of a fibrous material, preferably cardboard or cardboard is used. But you can also use a paper, a fleece, a nonwoven fabric or felt.

Another embodiment of the invention provides that the main body 20 the mold insert 10 consists of a yarn-containing material, in particular a woven fabric, a knitted fabric or a knitted fabric which has been produced from ceramic, glass or carbon fibers.

A further embodiment of the invention provides that the basic body 20 is made of a fibrous and a yarn-containing material, wherein z. B. cardboard can be combined with a felt or a fabric.

Around the mold inserts of the fiber and / or yarn-containing material the desired for the particular application To give strength and durability, the material is mechanical, thermally or chemically solidified. In particular, there is the possibility to mix the material with a binder or - im Trap a tissue to soak. Complementary or Alternatively, you can use the mold insert with a heat or refractory Treat or coat material.

The main body 20 can be single-layered. But it can also consist of several layers or layers, which - depending on the application - have different size dimensions and the mold insert 10 gives the desired properties. For example, several layers of cardboard or paper can be used, which lie congruently one above the other or are arranged in stages and thereby follow a desired component contour. Or you can combine different fiber and / or yarn-containing materials in the composite in order to optimally realize product-related properties.

As 7 further shows, can within the mold insert 10 a reinforcement 40 be educated. These are z. B. a grid of metal or a perforated plate. The reinforcement 40 can the entire body 20 cover or - as in 7 shown - only a portion of the body 20 , But it can also about the outer contours of the body 20 protrude, for example, to be incorporated in the casting core. This also makes the mold insert 10 reliably positioned and fixed in the casting core. It is also conceivable that the reinforcement on the outside of the mold insert 10 is applied.

To the mold insert 10 after the casting process from the component 1 to be able to pull out is at the base body 20 in the embodiment of 5 a tab 50 educated. This projects after the introduction of the mold insert 10 in the casting core 100 over its surface or over one in the 4 to 6 as a dot-dash line indicated cylinder head contact surface 25 out. In the embodiment of the 6 is on both sides of the contact area 22 to the casting metal one tab each 50 educated.

The main body 20 The mold insert may be rectangular, concave or convex in cross-section. The in the 8th and 9 illustrated embodiment provides a cross-section, which is wedge-shaped on both sides, so that the cavity 5 in the jetties 8th largely the contours of the cylinder bores 3 Follows what saves material and the cooling effects in the cavities 5 elevated.

The incorporation of the mold inserts 10 in the casting core 100 preferably takes place during core shooting in a core mold. This is the mold insert 10 first positioned in the desired position within the core mold and fixed if necessary. Subsequently, the freestanding contact areas 24 the mold inserts 10 completely surrounded with core sand during the filling process of the core mold. After curing of the binder are the mold inserts 10 with the casting core 100 connected to a solid and stable unit. By possibly in the contact areas 24 introduced openings 24 the core sand volume becomes both sides of the main body 20 the mold insert 10 connected with each other. The casting core 100 is not locally weakened.

A manufactured in this way casting core 100 , consisting of core sand and the injected mold inserts 10 , is then coated with a sizing and dried. The casting core now ready for casting 100 is then introduced into a mold. He shapes together with the mold inserts 100 the desired contour area for the water cooling, thus the cylinder walls 2 ' surrounding water jacket 4 and in the cylinder webs 8th trained narrow water bridges 5 ,

After the casting process, the casting blank is removed from the casting mold and sanded. These are made of cardboard, cardboard or paper mold inserts 10 automatically removed because these materials are carbonized due to the high temperatures during the casting process. Additional or separate cleaning is not necessary.

As far as the mold inserts 10 are made of fleece, nonwoven, felt, a woven fabric, a knitted fabric or knitted fabric, these can after the casting process with a simple tool on the tabs 50 taken and from the cylinder head 1 be removed.

After these steps leaves the mold insert 10 a clean, burr-free opening cross section for optimal water flow inside the cylinder block 1 , or in the upper cylinder region of the internal combustion engine.

The advantage here is that the mold inserts of the invention 10 Not only can be made simply and inexpensively due to the choice of materials. In particular, they permit the formation of extremely narrow or narrow recesses, channels, cavities and / or contour regions which can not be formed by conventional means. The mold inserts 10 made of fiber and / or yarn-containing material are sufficiently stable to exactly meet the required dimensions and tolerances can. If necessary, however, the material can also be additionally solidified, for example with a binder. At the same time, the inherent elasticity of the materials used ensures that the mold inserts 10 do not break, even if structures of less than 1 mm are formed. The durability of the cores 100 is significantly increased, especially during transport or handling.

The mold inserts according to the invention 10 thus allow the realization of design solutions that could not be realized with hitherto known foundry usual production methods and materials. Furthermore, the production of components is optimized with already achievable by conventional methods cross-sections, in particular, the nuclear-induced rejection is significantly reduced.

The residues of the mold inserts 10 can be removed very easily. The entire system thus represents a cost effective and effective solution.

The invention is not limited to one of the above-described embodiments, but can be modified in many ways. So must the mold inserts 10 not necessarily in the casting cores 100 be shot. You can see the main body 20 also force and or positively lock, for example, by gluing, welding or jamming. Further, the application of the mold inserts 10 not on the training of narrow water bridges 5 between the cylinder bores 3 a cylinder block 1 limited. On the contrary, they offer the designer the possibility of creating narrow contours in components that were not possible with previous molded materials and production equipment.

The application of the mold inserts 10 is not on foundry cores 100 limited. You can see the mold inserts 10 also use in molds to make with these filigree or narrow recesses and contour areas. The casting molds can - as well as the casting cores 100 , made of sand. But you can also use permanent molds and the mold inserts 10 there introduce positive and positive.

It can be seen that a mold insert 10 for a casting core 100 and / or for a mold for the manufacture of components 1 made of cast metal, with small and / or narrow cavities 5 to be provided, a rectangular in cross-section, concave or convex body 20 has at least one contact area 22 to the casting metal and at least one contact area 24 to the casting core 100 and / or to the casting mold. For a cost-effective and reliable training of small to very small cavities or recesses in the castings 1 to allow, it is provided that the basic body 20 is made of a fiber and / or yarn-containing material. The fibrous material is preferably cardboard, paperboard, paper, non-woven, non-woven or felt, while the yarn-containing material is a woven, knitted or knitted fabric. The fibrous and / or yarn-containing material may also be mixed and / or impregnated with a binder. In the contact areas 24 to the casting core 100 and / or to the mold can breakthroughs 30 be provided. You can see the mold inserts 10 even without any breakthrough 30 form. Or you bring one or more (not shown) breakthroughs in the contact area of the body 20 to cast metal to create there more material contours. To the stability of the mold insert 10 To increase or to create a component-related contour, the main body 20 be formed multi-layer, this with a reinforcement 40 can be provided. At least one on the main body 20 trained tab 50 may be removing the mold insert 10 from the component 1 serve.

All from the claims, the description and the drawing resulting features and benefits, including constructional details, spatial arrangements and method steps, can both for yourself and in various combinations be essential to the invention.

LIST OF REFERENCE NUMBERS

1

component

2

outer wall

2 '

cylinder wall

3

bore

4

cavity (Water jacket)

5

cavity (Water bridge)

6

recess

7

threaded hole

8th

web

10

core element

20

body

22

contact area

23 23 '

line

24

contact area

25

Cylinder head contact surface

30

breakthrough

40

reinforcement

50

flap

100

casting core

110

body

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• DE 3300924 A1 [0007]
• EP 0197365 A1 [0008]
• - DE 3828093 C2 [0009, 0010]
• - DE 19832718 A1 [0011]

Claims (20)

Mold insert ( 10 ) for a casting core ( 100 ) and / or a mold for the production of components ( 1 ) of cast metal, with small and / or narrow cavities ( 5 ) are to be provided with a basic body ( 20 ), which has at least one contact area ( 22 ) to the casting metal and at least one contact area ( 24 ) to the casting core ( 100 ) and / or to the casting mold, characterized in that the basic body ( 20 ) is made of a fiber and / or yarn-containing material. Mold insert according to claim 1, characterized that the fibrous material is cardboard, cardboard, paper, nonwoven, nonwoven fabric or felt is. Mold insert according to claim 1 or 2, characterized that the yarn-containing material is a fabric, a knit or a Knitted fabric is. Mold insert according to one of claims 1 to 3, characterized in that the fiber and / or yarn-containing material made of ceramic, glass or carbon fibers. Mold insert according to one of claims 1 to 4, characterized in that the fiber and / or yarn-containing material mixed and / or impregnated with a binder. Mold insert according to one of claims 1 to 5, characterized in that the basic body ( 20 ) is coated. Mold insert according to one of claims 1 to 6, characterized in that each contact area ( 24 ) to the casting core ( 100 ) and / or to the casting mold with at least one breakthrough ( 30 ) is provided. Mold insert according to one of claims 1 to 7, characterized in that the basic body ( 20 ) is formed in one or more layers. Mold insert according to one of claims 1 to 8, characterized in that the basic body ( 20 ) a reinforcement ( 40 ) having. Mold insert according to one of claims 1 to 9, characterized in that the basic body ( 20 ) with at least one tab ( 50 ) is provided. Mold insert according to one of claims 1 to 10, characterized in that the basic body ( 20 ) is rectangular in cross-section, concave or convex. Mold insert according to one of claims 1 to 11, characterized in that the basic body ( 20 ) is formed contoured on one or both sides in cross-section at least in sections. Foundry core ( 100 ) for the manufacture of components ( 1 ) of cast metal, with a base body ( 110 ) and with a mold insert ( 10 ) according to at least one of claims 1 to 11. Casting core according to claim 13, characterized in that the mold insert ( 10 ) force and / or positive fit in the body ( 110 ) is integrated or inserted. Casting core according to claim 13 or 14, characterized in that the basic body ( 110 ) and the mold insert ( 10 ) form a composite body. Casting core according to one of claims 13 to 15, characterized in that the mold insert ( 10 ) with at least one tab ( 50 ) provided from the base body ( 110 ) stands out. Casting core according to one of claims 13 to 16, characterized in that the basic body ( 110 ) and the mold insert ( 10 ) are coated. Mold for the production of components ( 1 cast metal, permanent or lost form, with a mold insert ( 10 ) according to at least one of claims 1 to 12 and / or with a casting core according to at least one of claims 13 to 17. Use of a mold insert ( 10 ) according to at least one of claims 1 to 12 for the production of a casting core ( 110 ) and / or a casting mold for casting components ( 1 ) made of cast metal. Use of a casting core ( 110 ) and / or a casting mold according to at least one of claims 13 to 17 with a mold insert ( 10 ) according to at least one of claims 1 to 12 for the production of a component ( 1 ) made of cast metal.

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