SINGLE-PIECE FEEDER BODY FOR USE IN METAL CASTING

Abstract

The invention relates to a single-piece feeder body for use as a component of a two-part or multi-part telescopic feeder insert in metal casting,

having a feeder wall which at least partially delimits a feeder cavity for receiving liquid metal, wherein the feeder wall has a passage opening for the liquid metal into the feeder cavity, and an outer surface on which there are arranged at least one outwardly projecting holding element and at least one guide part with a sliding section for a feeder element which corresponds with the feeder body,
wherein the guide part has a supporting section which protrudes outwardly on the outer surface and which, adjoining the sliding section of the guide part for guiding the feeder element, extends in the direction of the passage opening.

Claims

1. A single-piece feeder body (1) for use as a component of a two-part or multi-part telescopic feeder insert (40, 40′) in metal casting, having a feeder wall (2) which at least partially delimits a feeder cavity (42, 42′) for receiving liquid metal, wherein the feeder wall (2) has a passage opening (12) for the liquid metal into the feeder cavity (42, 42′), and an outer surface (6) on which there are arranged at least one outwardly projecting holding element (10) and at least one guide part (8) with a sliding section (14) for a feeder element (20, 20′) which corresponds with the feeder body (1), wherein the guide part (8) has a supporting section (16) which protrudes outwardly on the outer surface (6) and which, adjoining the sliding section (14) of the guide part (8) for guiding the feeder element (20, 20′), extends in the direction of the passage opening (12).

2. The feeder body (1) as claimed in claim 1, wherein the sliding section (14) has a sliding surface (34) and the supporting section (16) has a terminating surface (36), wherein the sliding surface (34) runs so as to be inclined at an angle (α1) with respect to the central axis (26), and the terminating surface (36) runs so as to be inclined at an angle (α2) with respect to the central axis (26) of the passage opening (12), wherein the angles (α1, α2) open in opposite directions.

3. The feeder body (1) as claimed in claim 1, wherein multiple guide parts (8) are arranged at angular intervals with respect to one another about the central axis of the passage opening (12), preferably at uniform angular intervals about the central axis (26) of the passage opening (12).

4. The feeder body (1) as claimed in claim 1, wherein five guide parts (8) are arranged with an offset of preferably approximately 72 angular degrees with respect to one another on the outer surface (6).

5. The feeder body (1) as claimed in claim 1, wherein the feeder body (1) has a first end (22), which defines the passage opening (12), and a second end (24), which is situated opposite the passage opening (12), and wherein, preferably, the supporting section (16) has a step-free transition to the sliding section (14), and/or, in the direction of the second end (24) of the feeder body (1), ends at the outer surface (6) of the feeder wall (2) in a step-free manner.

6. The feeder body (1) as claimed in claim 1, wherein the one or more guide parts (8) has a mounting section (18) which extends from the sliding section (14) in the direction of the second end (24) and which preferably protrudes on the outer surface (6).

7. The feeder body (1) as claimed in claim 6, wherein the mounting section (18) of the guide part (8) has a mounting surface (38) which runs so as to be inclined at an angle (α3) with respect to the central axis (26) of the passage opening (12), which angle differs from the angle (α1) of the sliding surface (34) of the sliding section (14), wherein the inclination angles of mounting surface (38) and sliding surface (34) have the same opening direction.

8. The feeder body (1) as claimed in claim 1, wherein the holding element (10) projects outward directly on the guide part (8) or is arranged so as to project outward on the outer surface (6) adjacent to the guide part (8).

9. The feeder body (1) as claimed in claim 5, wherein the holding element (10) is arranged so as to project approximately radially on the sliding section (14) of the guide part (8), and the supporting section (16) extends proceeding from the holding element (10) in the direction of the first end (22) of the feeder body (1).

10. The feeder body (1) as claimed in claim 1, wherein the sliding section (14) has a sliding surface (34) which runs approximately parallel to the outer surface (8) of the feeder wall (2) in a direction of extent of the guide part (8).

11. The feeder body (1) as claimed in claim 1, wherein the one or more guide parts (8) have a direction of extent running approximately parallel to the central axis (26), wherein, preferably, the mounting section (18) and/or the sliding section (14) has a width transversely with respect to the direction of extent of the guide part (8), said width widening in the direction of the first end (22) of the feeder body (1).

12. The feeder body (1) as claimed in claim 11, wherein the supporting section (16) has a width transversely with respect to the direction of extent of the guide part (8), said width decreasing in the direction of the first end (22) of the feeder body (1).

13. The feeder body (1) as claimed in claim 1, wherein the feeder wall (2) has a sleeve section (28), with an external cross section which widens from the second end (24) in the direction of the first end (22), and has a mounting region (30), which adjoins the sleeve section (28) and which serves for mounting on a mold model or on a mold plate (50) and which has a cross section which narrows in the direction of the first end (22).

14. The feeder body (1) as claimed in claim 1, wherein the one or more guide parts (8) extends along the sleeve section (28) from the second end (24) of the feeder body (1) in the direction of the transition (32) between sleeve section (28) and mounting region (30).

15. The feeder body (1) as claimed in claim 1, wherein the feeder body (1) (i) is formed from exothermic feeder material or comprises exothermic feeder material in certain sections, and/or (ii) is formed from insulating feeder material or comprises insulating feeder material in certain sections.

16. A two-part or multi-part feeder insert (40, 40′) for use in metal casting in casting molds, comprising a feeder body (1) as claimed in claim 1, and one or more further feeder elements (20, 20′), wherein the feeder body (1) is connected to the one or the further feeder elements (20, 20′) to form a telescopic feeder insert (40, 40′), and wherein the feeder body (1) together with the one further or together with at least one of the further feeder elements (20, 20′) defines the feeder cavity (42, 42′).

17. A kit for producing feeder inserts (40, 40′), comprising one or more feeder bodies (1) as claimed in claim 1, and at least two further feeder elements (20, 20′) which correspond with the one or more feeder bodies (1) such that two or more different feeder inserts (40, 40′) can be generated, the feeder cavities (42, 42′) of which have different volumes.

18. The kit as claimed in claim 17, comprising a centering mandrel (44, 44′) which corresponds with the passage opening (12) in the one feeder body (1) or in at least one of the at least two feeder bodies (1).

Description

[0033] The invention will be described in more detail below, with reference to the appended figures, on the basis of a preferred exemplary embodiment of a feeder body according to the invention and of a feeder insert according to the invention, from which further features which are preferred for the present invention are apparent. In the figures:

[0034] FIG. 1: shows a perspective illustration of a feeder body according to the invention for use in metal casting;

[0035] FIG. 2: shows a view of the feeder body according to the invention as per FIG. 1 from below;

[0036] FIGS. 3 and 3a: show a sectional illustration and an enlarged sectional illustration of the feeder body according to the invention as per FIG. 1;

[0037] FIG. 4: shows a view of a first embodiment of a feeder insert with a feeder body according to the invention;

[0038] FIG. 5: shows a view of a further embodiment of a feeder insert with a feeder body according to the invention as per FIG. 1; and

[0039] FIG. 6-FIG. 9: show views which schematically show the production of a casting mold from the placing-on of a feeder insert according to the invention to the pressing of the mold material used to form the casting mold.

[0040] FIG. 1 shows a single-piece feeder body 1 according to the invention which is used in metal casting in a casting mold (not shown in any more detail). The feeder body 1 has a feeder wall 2 with an inner surface 4 which is configured to at least partially delimit a feeder cavity 42, 42′ (FIG. 4 and FIG. 5) for receiving liquid metal. The feeder wall 2 of the feeder body furthermore comprises an outer surface 6 on which there is arranged at least one guide part 8 for a feeder element 20, 20′ (FIG. 4 and FIG. 5) which corresponds with the feeder body. Furthermore, on the outer surface 6, there is provided at least one outwardly projecting holding element 10 which is configured to hold the feeder element 20, 20′ in an initial position relative to the feeder body 1. Furthermore, the feeder wall 2 has a passage opening 12 (FIG. 2 and FIG. 3) which is configured such that liquid metal can enter the feeder cavity 42, 42′ (FIG. 4 and FIG. 5).

[0041] According to the invention, the feeder body 1 has, on the guide part 8, a sliding section 14 for the feeder element 20 which corresponds with the feeder body, wherein the guide part 8 furthermore has a supporting section 16 which protrudes outwardly on the outer surface 6. The supporting section 16, adjoining the sliding section 14 of the guide part 8, extends in the direction of the passage opening 12. By means of the supporting section 16, the forces that act on the sliding section 14 which is configured for guiding the feeder element 20 is reliably accommodated and dissipated into the adjoining region of the feeder wall 2. Furthermore, the guide part 8 has a mounting region 18, which likewise protrudes outwardly on the outer surface 6 of the feeder wall 2. The feeder body 1 furthermore has a first end 22, which defines the passage opening 12, and a second end 24, which is situated opposite the passage opening. The mounting region 18 extends from the sliding section 14 of the guide part 8 in the direction of the second end 24 on the feeder body 1. The supporting section 16 and the mounting section 18 are arranged at opposite ends of the sliding section 14.

[0042] As can be seen from FIG. 2, multiple guide parts 8 are arranged at angular intervals with respect to one another about the central axis 26 (FIG. 3) of the passage opening 12. In the embodiment shown, five guide parts 8 are arranged with an offset of preferably approximately 72 angular degrees with respect to one another on the outer surface 6. The holding element 10 protrudes outwardly directly on the guide part 8. All of the holding elements 10 together form a receptacle for the feeder element 20 that is to be held in an initial position relative to the feeder body.

[0043] FIG. 3 shows a sectional illustration of the feeder body 1 according to the invention, which has a sleeve section 28 with an external cross section which widens from the second end 24 in the direction of the first end 22. Furthermore, the feeder body 1 comprises a mounting region 30 which directly adjoins the sleeve section 28 and which serves for mounting on a mold model or on a mold plate 50 (FIG. 4 and FIG. 5). The mounting region 30 has an external cross section which narrows from the sleeve section 28 in the direction of the first end 22. In this way, the feeder body forms a reduced abutment surface against the mold plate 50 that is to be brought into abutment or contact with the feeder body. As is also shown in FIG. 3, the guide part 8 extends along the sleeve section 28. In the embodiment shown, the guide parts 8 extend along the entire height of the sleeve section 28 from the second end 24 of the feeder body 1 to the transition 32 between the sleeve section 28 and the mounting region 30.

[0044] The sliding section 14 has a sliding surface 34, and the supporting section 16 has a terminating surface 36. The mounting region 18 has a mounting surface 38 for the mounting of the feeder element 20 on the second end 24 of the feeder body 1. The holding element 10 is arranged so as to project approximately radially on the sliding section 14 of the guide part 8, wherein, in the case of a vertical arrangement of the feeder body according to the invention, the holding element 10 is arranged at the lower end of the sliding section 14 of the guide part 8. The supporting section 16, with its terminating surface 36 which is arranged directly below the holding element 10, extends in the direction of the first end 22 of the feeder body 1. The guide parts 8 have a direction of extent running approximately parallel to the central axis 26 of the passage opening, wherein the mounting section 18 and the sliding section 14 have a width transversely with respect to the direction of extent of the guide part 8, which width widens from the second end 24 in the direction of the first end 22 on the feeder body 1. By contrast, the supporting section 16 has a width transversely with respect to the direction of extent of the guide part, which width decreases in the direction of the first end 22 of the feeder body 1.

[0045] As can also be seen from FIG. 3, the inner surface 4 of the feeder wall 2 is formed such that the feeder cavity (FIG. 4 and FIG. 5) which is formed at least partially by the feeder body 1 narrows from the second end 24 on the feeder body 1 in the direction of the passage opening 12 on the first end 22 of the feeder body. In particular, the inner surface 4 has a cross section which narrows in the direction of the passage opening 12. In the embodiment shown, the inner surface 4 has a conical shape in certain sections.

[0046] FIG. 3a shows, in an enlarged image, the guide part 8 arranged in the region of the sleeve part 28 on the outer surface 6. The guide part 8 is illustrated with different hatching than the rest of the feeder wall in order to illustrate the specific design thereof. The guide part 8 and the feeder wall 2 are preferably of single-piece form, and there is no structural separation between the individual parts of the feeder body 1 that could be assumed from the different hatchings.

[0047] As shown in FIG. 3a, the sliding surface 34 of the sliding section 14 runs so as to be inclined at an angle α1 with respect to the central axis 26 of the passage opening 12 and the terminating surface 36 of the supporting section 16 runs so as to be inclined at an angle α2 with respect to the central axis 26 of the passage opening 12, wherein the angles α1 and α1 open in opposite directions. For a simplified illustration, the central axis 26 has been relocated into the feeder wall 2. The sliding surfaces 34 and the terminating surfaces 36 of the guide parts 8 are thus inclined in opposite directions in relation to the central axis 26 of the passage opening 12. The mounting surface 38 runs so as to be inclined at an angle α3 with respect to the central axis 26 of the passage opening, wherein the inclination angle α1 of the sliding surface 34 and the inclination angle α3 of the mounting surface 38 have the same opening direction but are of different magnitude in relation to the central axis 26 of the passage opening 12. The sliding surface 34 of the sliding section 14 runs approximately parallel to the outer surface 6 of the feeder wall 2 in the direction of extent of the guide part 8 in the region of the sleeve part 28. The outer diameter of the outer surface 6 of the feeder wall 2, and also the circumference defined by the sliding surfaces 34 of the guide parts 8, widen in the region of the sleeve part 28 from the second end 24 in the direction of the first end 22 of the feeder body 1.

[0048] As can also be seen from FIG. 3a, both the supporting section 16 and the mounting section 18 of the guide part 8 have a step-free transition to the sliding section 14. The supporting section 14, in the direction of the first end 22 of the feeder body 1, ends at the outer surface 6 of the feeder wall 2 in a step-free manner. The mounting section 18 also, in the direction of the second end 24 of the feeder body 1, ends at the outer surface 6 of the feeder wall 2 in a step-free manner.

[0049] FIG. 4 shows a first embodiment of a first feeder insert 40 according to the invention, which is formed from the feeder body 1 and from a first feeder element 20. The feeder body 1 and the feeder element 20 together form a feeder cavity 42 for the liquid metal that enters the feeder cavity via the passage opening 12. The feeder body 1 and the feeder element 20 are designed such that the feeder element 20 can, at least in certain sections, be displaced over the outside of the feeder body 1. The feeder body 1 is in particular displaceable in telescopic fashion into the feeder element 20. The feeder body 1 and the feeder element 20 are held in position with respect to one another by means of a centering mandrel 44. Furthermore, on the outer surface 6 of the feeder wall 2 of the feeder body 1, there is arranged a guide part 8 by means of which tilting or misalignment of the feeder element 20 relative to the feeder body 1 during the displacement movement of feeder body 1 and feeder element 20 with respect to one another is prevented. On the guide part 8, there is arranged a holding element 10 by means of which the feeder element 20 is held in an initial position prior to the displacement of the feeder element relative to the feeder body 1. The feeder element 20 has, at its upper end 46, a receptacle 48 for the tip of the centering mandrel 44.

[0050] FIG. 5 shows a second embodiment of a feeder insert 40′ which is assembled from the feeder body 1 according to the invention and a further feeder element 20′ which corresponds with the feeder body 1. As illustrated by FIG. 5, the feeder body 1 according to the invention can correspond with different feeder elements 20, 20′.

[0051] The feeder body 1 and the feeder element 20′ interact with one another in a manner virtually identical to that described with regard to FIG. 4. By contrast to the feeder insert 40 from FIG. 4, the feeder insert 40′ has an enlarged feeder cavity 42′ for receiving the liquid metal. At the closed, upper end 46 of the feeder element 20′, there is provided a receptacle 48′ for the centering mandrel 44′.

[0052] FIGS. 6-9 show an exemplary embodiment of a method for producing at least one mold part (not shown in any more detail) of a casting mold, wherein a feeder body 1 designed according to the invention is pushed or mounted with its passage opening 12 onto a centering mandrel 44. The centering mandrel 44 is fastened to a mold plate 50, which defines at least surface regions of the mold part to be produced (not shown in any more detail). The feeder body 1 abuts directly by way of its mounting region 30 against the mold plate 50.

[0053] In the next step, shown in FIG. 7, the feeder element 20 is mounted with its lower end on the mounting section 18 of the guide part 8, and the receptacle 48 at the upper end 46 of the feeder element 20 is pushed over the tip of the centering mandrel 44, and the feeder element 20 is thus assembled with the feeder body 1 to form a feeder insert 42 according to the invention. The feeder element 20 is displaced as far as into its initial position on the feeder body 1 until the feeder element 20 has been placed into abutment with the holding elements 10 which project radially outwardly on the guide parts 8.

[0054] In the method step shown in FIG. 8, a mold material 52 is introduced into a mold (not illustrated in any more detail). With the introduction of the mold material 52, the feeder insert 40 which is formed from feeder body 1 and the feeder element 20 is completely surrounded on the outside by the mold material 52.

[0055] Subsequently, as shown in FIG. 9, the mold material 52 within the mold is compressed, whereby the mold material 52, as indicated, is compacted and forms a solid mold part. With the compaction, the feeder element 20 is displaced parallel to the central axis 26 of the passage opening 12 in the direction of the mold plate 50. With the displacement of the feeder element 20 over the feeder body 1, the holding elements 10 arranged on the guide parts 8 are severed from the guide part 8. Furthermore, the feeder cavity 42 of the feeder insert 40 is reduced in size. The feeder element 20 furthermore runs on the circumference which is formed by means of the sliding surfaces 34 of the sliding sections 14 of the guide part 8 (FIG. 3a) and which widens in the direction of the first end 22 on the feeder body 1. The one or more sliding sections 14 which project on the outer surface 6 of the feeder wall 2 each form, with their sliding surfaces 34 of the guide parts 8, a type of run-on bevel for the feeder element 20 which can be displaced over the feeder body 1.

REFERENCE DESIGNATIONS

[0056] 1 Feeder body [0057] 2 Feeder wall [0058] 4 Inner surface [0059] 6 Outer surface [0060] 8 Guide part [0061] 10 Holding element [0062] 12 Passage opening [0063] 14 Sliding section [0064] 16 Supporting section [0065] 18 Mounting section [0066] 20, 20′ Feeder element [0067] 22 First end [0068] 24 Second end [0069] 26 Central axis [0070] 28 Sleeve section [0071] 30 Mounting region [0072] 32 Transition [0073] 34 Sliding surface [0074] 36 Terminating surface [0075] 38 Mounting surface [0076] α1, α2, α3 Inclination angle [0077] 40, 40′ Feeder insert [0078] 42, 42′ Feeder cavity [0079] 44, 44′ Centering mandrel [0080] 46 End [0081] 48, 48′ Receptacle [0082] 50 Mold plate [0083] 52 Mold material