Breaker core with netlike webbing spanning its through-opening

Abstract

A breaker core for use in a casting process includes a disk-shaped breaker core (10) having breaker core body and a through-opening (11) for liquid metal. A ring-shaped frame (12) made from a heat-resistant material is secured to the breaker core (10) and has a netlike webbing (15) tensioned therein. The netlike webbing (15) is made from a fire-proof material and spans the through-opening (11) of the breaker core (10) on an underside of a feeder. The frame (17) is secured with an outer sidewall (17) to the body of the disk-shaped breaker core (10). A plane of the netlike webbing (15) tensioned in the frame (12) is secured with a stepped offset to an upper end of the sidewall (17) facing the feeder, so that the netlike webbing (15) is placed in an area of an underside of the breaker core (10) facing the casting model.

Claims

1. A breaker core for use in a casting process, comprising: a disk-shaped breaker core (10) having breaker core body and a through-opening (11) for liquid metal; a ring-shaped frame (12) secured to the breaker core (10), wherein said frame (12) is made from a heat-resistant material and has a netted webbing (15) tensioned therein, said netted webbing (15) made from a fire-proof material, wherein the netted webbing (15) spans the through-opening (11) of the breaker core (10) on an underside of a feeder to be placed on a casting model, the underside of the feeder facing the casting model, wherein the frame (17) is secured with an outer sidewall (17) to the body of the disk-shaped breaker core (10), wherein a plane of the netted webbing (15) tensioned in the frame (12) is secured with a stepped offset to an upper end of the sidewall (17) facing the feeder, so that the netted webbing (15) is placed in an area of an underside of the breaker core (10) facing the casting model and is positioned with the feeder formed in the casting mold with the breaker core (10) directly on an upper surface of a casting piece formed in the casting process.

2. The breaker core according to claim 1, wherein a radial, outwardly projecting, at least partially circumferential flange (13) is formed on the upper end of the sidewall (17) and extends into the body of the disk-shaped breaker core (10).

3. The breaker core according to claim 2, wherein the body of the breaker core (10) covers an inner side of the sidewall (17) of the frame (12) with a spandrel (21) covering the projection (18) on an upper side of said projection.

4. The breaker core according to claim 1, wherein a projection (18) that supports the netted webbing (15) is formed on a lower end of the sidewall (17) facing the casting model.

5. The breaker core according to claim 1, wherein the ring-shaped frame (12) comprises two frame parts (19, 20) that are moveable relative to one another, and wherein after tensioning of the netted webbing (15), the two frame parts (19, 20) are attachable to one another.

6. The breaker core according to claim 5, wherein the frame parts (19, 20) are insertable into one another to form the frame (12), wherein the netted webbing (15) is disposed between the two frame parts (19, 20) and is tensioned via attachment of the frame parts to one another.

7. The breaker core according to claim 6, wherein the frame parts (19, 20) with the netted webbing (15) disposed therebetween are connected to one another via clinching with positive-fit and push button connections made in a cold-forming process, wherein the connections of the frame parts (19, 20), respectively, catch the netted webbing (15) positioned between the two frame parts (19, 20).

8. The breaker core according to claim 6, wherein the frame parts (19, 20) that are insertable into one another each have a cup-shaped design with a conical contour, wherein the upper end of the sidewall (17) tapers to a lower end of the sidewall (17), wherein the netted webbing (15) is fixed to the lower end.

9. The breaker core according to claim 1, wherein the frame (12) with the netted webbing (15) tensioned therein is shot into the disc-shaped breaker core (10) during manufacture of the breaker core (10) by shooting into a shooting machine.

10. The breaker core according to claim 1, wherein the frame comprises a metal.

11. The breaker core according to claim 10, wherein a projection (18) is formed on a lower end of the sidewall (17) facing the casting model, wherein an underside of the projection (18) that faces the casting model is provided with a fire-resistant coating.

12. The breaker core according to claim 1, wherein the frame (12) comprises a ceramic or a fire-resistant material.

13. The breaker core according to claim 1, wherein the netted netlike webbing (15) has a through-hole (16), wherein said though-hole (16) is dimensioned to be smaller than the through-opening (11).

14. The breaker core according to claim 13, wherein the through-hole 16 has a surface of 10% to 50% of a surface of the netted webbing (15) enclosed by the frame (12).

15. The breaker core according to claim 1, wherein a width of a net opening in the netted webbing (5) is 1 mm to 2 mm, wherein a net structure of the netted webbing comprises a plurality of fibers, wherein each of said fibers has a width of 1 mm to 15 mm.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) An exemplary embodiment of the present invention is shown in the drawings and will be described in greater detail below. In the figures:

(2) FIG. 1 shows a disk-shaped breaker core with a frame having a netlike webbing anchored and tensioned therein in cross section;

(3) FIG. 2 shows the frame according to FIG. 1 in a detailed representation in cross section;

(4) FIG. 3 shows the frame according to FIG. 2 including the netlike webbing tensioned therein in a plan view;

(5) FIG. 4 shows a further embodiment of the breaker core according to FIG. 1; and

(6) FIG. 5 shows a further embodiment of the breaker core according to FIG. 1; and

(7) FIG. 6 shows a frame made from frame parts using clinching as a connecting technology.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

(8) FIG. 1 shows a disc-shaped breaker core 10 with a centrally arranged through-opening 11, which is made from a fire-resistant molding mixture by shooting into a shooting machine. In the disc-shaped breaker core 10, a frame 12 is arranged, which holds a netlike webbing 15, which spans over the through-opening of the breaker core 10.

(9) The frame 12 has a cup-shaped design with a circumferential sidewall 17, whereby the cup-shaped design tapers slightly conically to the netlike webbing 15. On the upper end of the sidewall 17, which has the greater diameter of the frame contour, an outer, circumferential, radially projecting flange 13 is formed, while the netlike webbing 15 is held on the lower end of the sidewall 17 that is oppositely disposed to the flange 13. As shown by combining FIGS. 2 and 3, the frame 12 comprises two frame parts having congruent shapes, namely, an outer frame part 19 and an inner frame part 20, which are inserted into one another. The netlike webbing 15 is arranged between the outer frame part 19 and the inner frame part 20 and is tensioned during the assembly of the frame 12 by the insertion of the two frame parts 19, 20 into one another; subsequently, the two frame parts 19, 20 are fixed to one another, preferably welded to one another. In this manner, a stabile component that can be manipulated safely when the breaker core is manufactured. With the embodiment shown, an inner, supporting projection 18 is formed on each of the two frame parts 19 and 20, respectively, on the end of the sidewall 17 opposite the flange 13, whereby both projections 18 commonly clamp the netlike webbing 15 between them and in this manner, offer additional support, in particular in the edge region. Both frame parts 19 and 20 are connected to each other by spot welding at points 22.

(10) As shown in FIG. 3, it can be provided that in the netlike webbing, preferably centrally in the free surface ling within the frame, a through-hold 16 is provided, which serves to reduce the flow resistance with the breaker core. This through-hole 16 can have a surface of about 10 to 50% of the through-opening of the breaker core that is surrounded by the frame. Generally, this type of through-hole is not necessarily required.

(11) The frame 12 is placed in the manufacture of the disk-shaped breaker core 10 in the shooting form, and thereby shot in the molding mixture such that the flange 13 will be positioned approximately in the center of the material thickness of the disk-shaped breaker core 10. Based on the offset of the netlike webbing 15 formed by the sidewall 1 of the frame 17 to the plane of the flange 13, the netlike webbing 15 is positioned in the breaker core 10, which is molded in the casting mold as a component of a feeder, so that the netlike webbing 15 is positioned directly on the surface of the casting piece to be formed during the casting process.

(12) With the embodiment shown, the dimensions of the frame relative to the through-opening 11 of the breaker core 10 are selected, such that the material of the breaker core 10 also covers the inner side of the sidewall 17 with a spandrel 21, whereby the projection formed on the inner frame part 20 forms the bearing for the spandrel of the breaker core material covering the sidewall 17. In this regard, a particularly good anchoring of the frame 12 in the breaker core body can be realized; however, this is not necessarily required. The sidewall 17 also can form directly the inner wall of the through-opening, whereby then the flange 13 serves as a corresponding fixing of the frame 12 to the breaker core.

(13) The design of the frame 12 shown in the drawings with the flange 13 and the projection 18 represents an advantageous embodiment of the invention; however, also other forms of the frame 12 are included in the invention. Thus, the additional formation of the flange 13 on the frame 12 can be eliminated (FIG. 4), and it is also possiblealternatively or additionallyto eliminate the formation of the projection 18. In this case, the netlike webbing 15 is connected directly with the lower wall of the sidewall 17 (FIG. 5).

(14) FIG. 6 provides technically appropriate connecting techniques for connecting the frame parts 19, 20, which are especially suited for serial production of the frame in an easy to manipulate manner and in view of the specifications of the frame, including netlike webbing 15 held on the frame. It should be noted that a netlike webbing 15 having a through-hold 16 is placed between the frame parts 19, 20 and extends also in the region of the outer flanges 13 of the two frame parts 19, 20 that contact one another. In this region, both frame parts 19, 20 are connected to one another through the application of so-called TOX points 25 in a clinching process. This known connecting technique requires no additional connecting means and does not require the use of heath, in that it uses a cold forming process to create a positive-fit and punctiform connection of the two flanges 13, whereby the TOX points 25 are produced by introducing a matrix punch in a die by pressing in the materials lying between the matrix punch and the die into the die. Based on specialized die molds, a material hardening occurs in the die region, so that quasi press button type connections are created. By means of the punctiform pressing of the two flanges 13 including the netlike webbing 15 lying between them in the die used in the clinching process, the net tensioning is increased and is fixed accordingly after completion of the cold deformation.

(15) The features of the subject matter of this invention set forth in the above description, the patent claims, the abstract and the drawings can be used individually and in any desired combination for the realization of the invention in its various embodiments.

(16) The specification incorporates by reference the disclosure of DE 20 2015 104 553.0, filed Aug. 2, 2015.

(17) The present invention is, of course, in no way restricted to the specific disclosure of the specification and drawings, but also encompasses any modifications within the scope of the appended claims.