Feeder insert and method for arranging same in a casting mold

Abstract

A feeder insert for use for the casting of metals into casting molds, having a mold body (6) and a supply element (4) which delimit the feeder cavity (10) for receiving liquid metal, wherein the supply element (4) has a passage opening (26) for the liquid metal, and wherein the mold body (6) is movable in a feeder longitudinal direction relative to at least one part of the supply element (4), characterized in that the supply element (4) has a deformation region which is designed to trim in at least in sections in at least a first phase of a relative movement of the mold body (6) in the feeder longitudinal direction and in the direction of the supply element (4).

Claims

1. A feeder insert for use for the casting of metals into casting molds, having a mold body (6) and a supply element (4) which delimit the feeder cavity (10) for receiving liquid metal, wherein the supply element (4) has a passage opening (26) for the liquid metal, and wherein the mold body (6) is movable in a feeder longitudinal direction relative to at least one part of the supply element (4), wherein the supply element (4) has a deformation region (22) which is designed to invert at least in sections in at least a first phase of a relative movement of the mold body (6) in the feeder longitudinal direction and in the direction of the supply element (4), wherein a wall part of an inverted section (36) of the deformation region (22) is configured so as to be supported against an inner wall of the mold body (6).

2. The feeder insert as claimed in claim 1, wherein the deformation region (22) is designed to invert in the direction of the interior of the mold body (6).

3. The feeder insert as claimed in claim 1, wherein as a result of a movement of the mold body (6) in the feeder longitudinal direction relative to at least one part of the supply element (4), it is achieved that at least one section (36) of the deformation region (22) of the supply element (4) projects at least over a predetermined distance into a region, corresponding to the supply element, of the mold body (6) for the liquid metal.

4. The feeder insert as claimed claim 1, wherein the deformation region (22) of the supply element (4) is designed or configured such that, after at least a first phase of the relative movement between the mold body (6) and supply element (4), it has two wall sections running approximately parallel in the feeder longitudinal direction.

5. The feeder insert as claimed in claim 1, wherein the deformation region (22) is designed to invert in the direction of the mold body (6) without a dead space.

6. The feeder insert as claimed in claim 1, wherein the deformation region (22) is designed such that, during a second phase, which follows the first phase, of the relative movement between the mold body (6) and supply element (4), said deformation region kinks inward along a part.

7. The feeder insert as claimed claim 1, wherein the supply element (4) is connected to the mold body (6) via a coupling region which ensures a connection between supply element (4) and mold body (6) during the inverting process.

8. The feeder insert as claimed in claim 1, wherein the supply element (4) has a support region (34) which engages on the mold body (6) and which serves to form a coupling region between the supply element (4) and mold body (6).

9. The feeder insert as claimed in claim 1, wherein the feeder insert (2) has a feeder longitudinal axis (8), wherein the support region (34) is a collar which is in contact with the underside (12) of the mold body (6) and which extends substantially radially with respect to the feeder longitudinal axis (6).

10. The feeder insert as claimed in claim 1, wherein the deformation region (22) has a cylindrical sleeve which, before the relative movement, has a depression (32), which projects outward in the manner of a bent flange, in the transition to the support region (34).

11. The feeder insert as claimed in claim 1, wherein the supply element (4) has an extension region (24) which tapers conically below the deformation region (22).

12. The feeder insert as claimed in claim 1, wherein the extension region (24) is equipped with a breaking edge (50).

13. The feeder insert as claimed in claim 1, wherein the extension region (24) of the supply element (4) has beads (42, 42).

14. The feeder insert as claimed in claim 1, wherein the mold body (6) and/or the supply element (4) have guide surfaces for guiding a centering core (44).

15. The feeder insert as claimed in claim 1, wherein the material for the supply element (4) is formed from or comprises a metallic material.

16. The feeder insert as claimed in claim 1, wherein the material for the mold body (6) is or comprises a material which has exothermic and/or insulating properties.

17. A casting mold having a feeder insert (2) as claimed in claim 1.

18. A method for arranging a feeder insert (2) in a casting mold, having the following steps: providing a feeder insert (2) as claimed in claim 1, arranging the feeder insert (2) in a molding machine such that the mold body (6) and the supply element (4) are present in an arrangement proceeding from which the mold body (6) can be moved relative to at least one part of the supply element (4), filling molding material into the molding machines such that the outer wall of the feeder insert (2) is placed in contact with the molding material, compressing the molding sand such that the mold body (6) is displaced relative to the supply element (4), and at least one portion of the deformation region (22) of the supply element (4) is inverted, wherein a portion of the deformation region (22) is inverted into at least one portion of the feeder cavity of the mold body (6) when the mold body (6) is moved along the feeder longitudinal axis in the direction of the supply element (4).

19. The method as claimed in claim 18, wherein the molding machine has a pattern plate (30) and the supply element (4) is inserted into the molding machine such that it is placed in direct contact with the pattern plate (30) and/or with a centering core (44).

20. A feeder insert for use for the casting of metals into casting molds, having a mold body (6) and a supply element (4) which delimit the feeder cavity (10) for receiving liquid metal, wherein the supply element (4) has a passage opening (26) for the liquid metal, and wherein the mold body (6) is movable in a feeder longitudinal direction relative to at least one part of the supply element (4), wherein the supply element (4) has a deformation region (22) which is designed to invert at least in sections in at least a first phase of a relative movement of the mold body (6) in the feeder longitudinal direction and in the direction of the supply element (4), wherein the deformation region is designed so that at least a portion of the deformation region (22) is inverted into at least one portion of the feeder cavity of the mold body (6) when the mold body (6) is moved along the feeder longitudinal axis in the direction of the supply element (4).

Description

(1) The invention will be explained in more detail below on the basis of possible exemplary embodiments and with reference to the appended figures, in which:

(2) FIG. 1 is a schematic illustration of a feeder insert according to the invention in its initial arrangement, in longitudinal section;

(3) FIG. 2 shows a detail view of a supply element according to the invention as per FIG. 1, in longitudinal section;

(4) FIG. 3 shows a detail view of the supply element according to the invention, showing the supply element in a partially inverted state in the mold body;

(5) FIG. 4 shows a detail view of the supply element after a completed relative movement between the mold body and supply element;

(6) FIG. 5 shows a detail view of the supply element according to the invention;

(7) FIG. 6 shows a detail view of a feeder insert with a supply element of alternative design;

(8) FIG. 7 shows a schematic partial view of the feeder insert according to the invention from FIG. 1 in combination with an alternative centering pin, and

(9) FIG. 8 shows an enlarged view of the detail VIII circled in FIG. 7.

(10) FIG. 1 shows a feeder insert 2 according to the invention in its initial arrangement. The feeder insert 2 has a supply element 4 and a mold body 6. The supply element and the mold body 6 are preferably formed as substantially rotationally symmetrical mold parts. The axis of rotation of the feeder insert 2 (feeder longitudinal axis), which runs in the feeder longitudinal direction, is indicated by a dash-dotted line 8. The mold body 6 has an outer contour which, in a lower section proceeding from the underside 12 of the mold body 6, widens conically in an upward direction. In a central part 14 which extends over more than half of the overall height of the mold body 6, the mold body 6 has an outer contour which continues to widen conically to a small degree. In an upper section of the mold body, the mold body tapers again conically and ends at a horizontally running top side 16. The inner contour, which defines the feeder cavity, of the mold body 6 has an inner wall 18 which tapers conically to a small degree in an upward direction proceeding from the underside 12, which inner wall, in the upper section of the mold body 6, merges into a wall part 19 which narrows in a more intensely funnel-shaped manner and which constitutes a guide surface for a centering core or centering pin (not illustrated in the drawing of FIG. 1), The upper termination of the feeder cavity 10 is formed by a cylindrical centering recess 2 receiving the tip of the centering core centering pin.

(11) FIG. 2 shows a detail view of the supply element 4 which has a cylindrical, sleeve-like deformation region 22 and an extension region 24 which, on the deformation region, tapers in the direction of an indicated pattern plate 30. The extension region has a passage opening 26. At the upper end of the deformation region there is provided an encircling bead-like depression 32, on which there is laterally arranged a support region 34 running in a radial direction with respect to the feeder longitudinal axis 8 and which is by way of example in the form of a collar which is in contact with the underside 12 of the mold body 6.

(12) FIG. 3 shows the feeder insert 2 according to the invention during a first phase of a relative movement between the supply element 4 and mold body 6. Owing to a prior displacement of the mold body 6, it is already the case in the illustration as per FIG. 3 that the upper region of the deformation region has been inverted, in sections, in the direction of the feeder cavity 10. The inverted section (inverted section) 36 bears against the inner wall 18 of the mold body 6. FIG. 3 shows that the support part 34 warps in regions owing to the forces acting on it, said forces being caused by the movement of the mold body 6; material fracture is prevented in this way.

(13) FIG. 4 shows the supply element designed according to the invention after a completed upsetting movement, that is to say a maximum relative movement between the mold body 6 and supply element 4. In addition to the inverted section 36 of the deformation region 22, a kink region 38 has also formed. In an alternative embodiment of the invention not illustrated in a drawing, which embodiment dispenses with a kink region, it is the case after a completed upsetting movement that the supply element has merely an inverted section which (depending on the dimensions of the supply element and the dimensions of the cavity in the mold body) bears directly against the inner wall of the mold body 6 or extends into the feeder cavity 10 with a spacing to the inner wall (that is to say without making direct contact with the inner wall).

(14) FIG. 5 shows the supply element in a detail view and illustrates more clearly the structural design thereof. The supply element 4 is rotationally symmetrical and is preferably formed in one piece from a metallic material, for example from a soft steel which is suitable for cold working. Here, the supply element forms a lower part of the feeder insert 2 according to the invention, which lower part, after its shaping which is performed preferably by means of deep drawing, has a material thickness of approximately 0.5 mm. The supply element 4 is formed from the conically running extension region 24, the cylindrical deformation region 22, the bead-like depression 32 and the support region 34. The bead-like depression 32 which connects the deformation region 22 to the support region 34 forms the region at which the inverting process starts while the upsetting movement of the feeder insert 2 according to the invention is taking place.

(15) FIG. 6 shows a supply element 4 of alternative design which, by contrast to the exemplary embodiment shown in FIG. 2, has multiple beads 42, 42 on its conically running or funnel-shaped extension surface 40 and in the direction of extent of the extension region 24. The beads 42, 42 have the effect of increasing the strength or deformation resistance of the extension region 24 of the supply element 4.

(16) After the placement of the feeder insert 2 according to the invention onto the pattern plate 30 (FIG. 2), the filling (not shown in any more detail) of mold material into a mold box that receives the pattern plate firstly takes place, such that the supply element and the mold body of the feeder insert 2 are at least laterally encased by the mold material. The mold material is then compacted, and the compaction effects an upsetting movement of the feeder insert (that is to say a relative movement between the supply element 4 and the mold body 6). Owing to the upsetting movement, the deformation region 22 of the supply element 4 is inverted at least in sections into the feeder cavity 10 (FIG. 3). Here, the inverted section 36 which is formed bears against the inner wall 18 of the mold body 6. After a completed upsetting movement, as shown in FIG. 4, the underside 12 of the mold body 6 bears directly against the pattern plate 30. In addition to the inverted section 36, a kink region 38 is generated, whereby the inverted depth of the supply element 4 into the feeder cavity 10 is kept small.

(17) FIG. 7 shows a partial view of the feeder insert 2 according to the invention which is arranged and oriented on the pattern plate 30 by means of a specifically configured centering core (centering pin) 44. The centering core 44 includes a centering ring 46 (in contact with the pattern plate 30) which, in the direction of the pattern plate 30, widens conically in relation to the feeder longitudinal axis 8. As shown in FIG. 8, the centering ring 46 forms a base for the extension region 24, which is to be pushed thereon, of the supply element 4. Owing to the conical shape of the centering ring 46, automatic centering of the feeder insert 2 relative to the centering core 44 is also realized. In the present case, the centering ring 46 is adapted in terms of its dimensions to the dimensions of the extension region 24, preferably of the passage opening 26 thereof (FIG. 2), such that the extension region 24 of the supply element 4 is seated on the conical centering ring 46 and is thereby held spaced apart from the surface of the pattern plate 30. In this way, a gap 48 is generated between the extension region 24 of the feeder insert and the pattern place 30, cf. again FIG. 8. The gap dimension is preferably less than 0.3 mm. In the appended figures, identical components are denoted by the same reference signs.

(18) In an alternative exemplary embodiment of the invention which is not shown, the feeder insert according to the invention is used together with a centering core which does not have or comprise a centering ring. In this case, the extension region of the supply element of the feeder insert, after the latter is inserted into the molding machine, comes into direct contact with the surface of the pattern plate despite the use of a centering core.