Casting flow runner system and a frame provided therefor with a predetermined breaking point for metal residue remaining in pipe sections

Abstract

A casting flow running system (11) for supplying liquid metal to a mold cavity formed in a casting mold includes a plurality of pipe sections (13) that are connected to one another; at least one ingate pipe (13) for connecting the casting flow runner system (11) with an ingate of a casting model forming the mold cavity; and a frame (15) made of a heat-resistant material disposed on the ingate pipe (13). The frame has a net-like webbing (18) made of a fireproof material tensioned therein and is attached to the ingate pipe (13) such that the netlike webbing (18) at least partially spans a cross section of the ingate pipe (13) and is positioned in a region proximate to a surface of a casting piece formed by filling the mold cavity.

Claims

1. A casting flow running system (11) for supplying liquid metal to a mold cavity formed in a casting mold, comprising: a plurality of pipe sections (12) that are connected to one another; at least one ingate pipe (13) for connecting the casting flow runner system (11) with an ingate of a casting model (10) forming the mold cavity; a frame (15) comprising a heat-resistant material disposed on the at least one ingate pipe (13), said frame having a netted webbing (18) made of a fire-proof material tensioned therein, wherein the frame (15) is attached to the at least one ingate pipe (13) at an open end of the at least one ingate pipe, such that the netted webbing (18) at least partially spans a cross section of the open end of the at least one ingate pipe (13) and is positioned in a region proximate to a surface of a casting piece formed by filling the mold cavity.

2. The casting flow running system (11) according to claim 1, wherein the frame (15) is in the form of a displacement sleeve and has a pipe section (16) outwardly engaging over the end of the at least one ingate pipe (13), wherein the frame (15) is attachable onto the end of the at least one ingate pipe (13) via the pipe section (16).

3. The casting flow running system (11) according to claim 2, wherein the frame (15) has a projection (17) that radially projects from an outer circumference of the pipe section (16).

4. The casting flow running system (11) according to claim 1, wherein the frame (15) comprises two frame parts (20, 21) that are movable against one another, wherein said frame parts are securable to one another after application of required tensioning of the netted webbing (18).

5. The casting flow running system (11) according to claim 4, wherein the frame parts (20, 21) are insertable into one another, wherein the webbing (18) is tensioned between the frame parts (20, 21) by insertion of the frame parts into one another.

6. The casting flow running system according to claim 4, wherein the frame parts (20, 21) comprise a first inner frame part (20) and a second outer frame part (21), said first inner frame part (20) having a cylindrical shape (22) and a first inner flange (23) disposed on an end of said first inner frame part (20), said second outer frame part (21) having a cylindrical shape (24) outwardly surrounding the first inner frame part (20), said second outer frame part (21) having an outward projection (17) and a second inner flange (25) associated with the first inner flange (23) of the first frame part (20), wherein when said frame parts (20, 21) are inserted into one another, the first inner flange (23) and the second inner flange (25) of the respective frame parts (20, 21) receive and tension the netted webbing (18) therebetween.

7. The casting flow running system (11) according to claim 4, wherein the frame parts (20, 21) with the netted webbing (18) positioned therebetween are connected to one another via clinching by form-locking and push button connectors made in a cold forming process, wherein the connectors of the frame parts (20, 21) are spaced apart from one another and catch the netted webbing (18) secured between the frame parts (20, 21).

8. The casting flow running system (11) according to claim 4, wherein the frame (15) is dimensioned to be larger than the at least one ingate pipe (13) or a pipe section (12) of the casting running flow system (11) and is disposed outside of the at least one ingate pipe (13) or the pipe section (12), respectively, wherein the netted webbing (18) extends over an entire cross section of the at least one ingate pipe (13) or the pipe section (12), respectively.

9. The casting flow running system (11) according to claim 4, wherein the frame (15) is held in a separate adapter (25) made from a fireproof material.

10. The casting flow running system (11) according to claim 9, wherein the adapter (25) comprises two form-locking adapter parts (26, 28) that engage in one another and thereby clamp the frame (15) therebetween, such that the netted webbing tensioned within the frame (15) extends over a through-flow opening (30) formed in the adapter parts (26, 28).

11. The casting flow running system (11) according to claim 10, wherein upon connection of the adapter (25) to a pipe section (13), one of said adapter parts (26) has a return (27) on an outer side of the adapter (25) for insertion into an end of the pipe section (13), and the other of said adapter parts (28) has a disk-shaped form, such that the netted ebbing (18) extends on the mold cavity of the casting mold on an outer face of the adapter part (25) in an area of a contact plane (29) of the adapter (25).

12. The casting flow running system (a1) according to claim 10, wherein upon arrangement of the adapter (25) between the pipe sections (12) of the casting flow running system (11), one of said adapter parts (26) has a return (27) for insertion of the adapter part (26) in an end of the pipe section (12) of the casting flow running system (1) on an outer side of the adapter (25) and the other of said adapter parts (28) has a receiving element (35) on an opposite outer side of the adapter (25) for insertion of the end of a further tube section (12) into the adapter part (28).

13. The casting flow running system (11) according to claim 4, wherein the fireproof material is ceramic.

14. The casting flow running system (11) according to claim 13, wherein the frame parts (20, 21) that are insertable into one another have, respectively, a cup-like form with an approximately conical contour that tapers from an upper end to a side wall (32) of the frame parts (20, 21) to a lower end with the netted webbing (18) secured therein, wherein a flange (30) is positioned on and projecting from on an upper end of the side wall (32), and wherein clinching points (34) are arranged on said flange (30).

15. The casting flow running system (11) according to claim 1, wherein a frame (15) with a netted webbing (18) tensioned within the frame (15) is disposed between individual pipe sections (12) of the casting flow running system (11).

16. The casting flow running system (11) according to claim 1, wherein the netted webbing (18) has a through-hole (19), which has a smaller size than the free cross section of the at least one ingate pipe (13).

17. The casting flow running system (11) according to claim 16, wherein the through-hole (19) has a surface of 5% to 90% of a free cross sectional surface of the at least one ingate pipe (13).

18. The casting flow running system (11) according to claim 1, wherein a width of a net opening in the netted webbing (18) is 1 mm to 20 mm, and wherein a width of fibers forming the netlike webbing (18) is 1 mm to 15 mm.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) In the drawings, exemplary embodiments of the invention are shown, which will be described below in greater detail. In the drawings:

(2) FIG. 1 shows a mold cavity in a casting model forming a casting mold with a casting flow runner system connected thereto in a schematic representation;

(3) FIG. 2 shows the connection of an angled pipe section to the casting model in an enlarged representation that includes a frame;

(4) FIG. 3 shows the pipe section with the frame that holds a netlike webbing inserted thereon in a detail representation;

(5) FIG. 4 shows the frame of FIG. 2 or 3 in an enlarged sectional representation;

(6) FIG. 5 shows an adapter for connection to a connecting pipe with a frame secured thereto in a sectional representation;

(7) FIG. 6 shows a frame made by using clinching as a connection technique for the frame parts in a partial view;

(8) FIG. 7 shows a casting flow runner system with individual tube sections in a schematic representation; and

(9) FIG. 8 shows an adapter for placement between individual pipe sections of a casting flow runner system in a sectional representation.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

(10) FIG. 1 shows in a schematic representation a casting model 10 on which a casting flow runner system is disposed, which is formed together with the casting model during production of a casting mold in the mold sand. The casting model comprises a central supply pipe 12 with, respectively, an advantageous design, whereby the casting flow runner system 11 has at least one or multiple inlets 14 for filling the subsequent mold cavity with liquid metal as wells as individual pipe sections 13 in the area of the transition from the casting flow runner system 11 to the casting model 10, via which the liquid metal conducted into the casting flow runner system 11 enters into the cavity mold formed by the casting model 10.

(11) As provided in FIG. 2, a frame 15 is disposed between the end of one pipe section 13 and the casting model 10; the frame 15 supports and tensions within it a netlike webbing (FIG. 3) which crosses the cross section of the pipe section 13. The pipe-like frame 15 formed with a corresponding diameter is displaced with a ingate pipe 16 onto the associated pipe section 13. On the outer circumference of the ingate pipe 16, a radially outwardly projecting projection 17 is disposed, which, on the one hand, can assist with assembly of the casting flow runner system 11 for mounting of the frame 15 and on the other hand, also is surrounded by the mold sand that is introduced into the casting flow runner system including the casting model formed in the casting mold and based on the formed undercuts, is fixed into its position to the ingate pipe and mold cavity.

(12) As can be seen from FIG. 3, a netlike webbing 18 is secured to the end of the pipe-shaped frame 15 facing the casting model 10, the netlike webbing crossing over the cross section of the ingate pipe 13. With the embodiment shown, a through-hole 19 is provided in the netlike webbing for reducing the flow resistance, the through-hole 19 having a smaller dimension than the cross section of the ingate pipe, so that as a result, the netlike webbing crosses over at least partially the cross section of the ingate pipe. Specifically, according to an embodiment of the invention, it can be provide that the through hole 19 has a surface of 5 to 90% of the free cross sectional surface of the frame enclosed by the frame, whereby the net width, that is, the width of the net opening, is 1 mm to 20 mm with a width of the fibers forming the net structure being 1 mm to 15 mm. The netlike webbing 18 further is arranged on the frame 15 such that the netlike webbing is poisoned in the directly area of the surface of the casting piece formed by filling the mold cavity forming the casting model 10, so that the metallic residue remaining in the frame including the ingate pipe can be knocked off near the casting piece surface. The netting also can be made from wire mesh or from a fireproof webbing.

(13) With the embodiment that is shown, which is shown in greater detail in FIG. 4, the frame 15 is formed by two frame parts that can be inserted into one another, namely, a first inner frame part 20 and a second outer frame part 21. The first inner frame part 20 has a cylindrical design 22 and has an inwardly resilient flange 23 on one of its ends. With its cylindrical section 22, the frame part 20 is displaceable onto the end of the ingate pipe 13 and thereby forms the corresponding pipe section 16 (FIG. 2). Also, the second outer frame part 1 received the first inner frame part 20 upon insertion into one another has a cylindrical design 24 that outwardly encompasses the first frame part 20 with the outward projection 17 formed on this cylindrical section and has an inner flange 25 associated with the inner flange 23 of the first frame part 20. Upon insertion of the frame parts 20 and 21 into one another, the flanges 23, 25 of the two frame parts 20, 21 are oriented parallel to one another and receive and tension the netlike webbing 18 therebetween.

(14) The embodiment shown in FIG. 5 shows an adapter comprising a ceramic, selected from a group of fireproof materials, in which the frame tensioning the netlike web 18 is held, whereby the adapter 25 itself is molded during the making of the casting mold in the mold sand and in this manner, is secured in the casting mold. In this regard, the frame 15 is attached indirectly relative to the mold cavity or later casting piece. The adapter 25 is formed, such that it forms the transition of the ingate pipe 13 to the later mold cavity or to the casting piece after termination of the casting process.

(15) The adapter 25 comprise a first adapter part 26, which has a return 27 for on one of its ends for insertion into or connection to the ingate pipe 13. A second, annular adapter part 28 cooperates with the first adapter part 26 via a form-locking design 31, so that when the adapter parts 26 and 28 are connected, the provided adapter 25 is formed. The adapter part 28 faces the mold cavity with its lower contact plane 29 during casting in the casting mold. Between the adapter parts 26 and 28, the frame 15 is positioned with the netlike webbing 18 tensioned therein, whereby the frame 15 has a design equipped with a form-locking design 31 between the adapter parts 26, 28, so that the frame 15 is fixed between the two adapter parts 26, 28.

(16) As FIG. 6 shows, the frame 15 in turn comprises two frame parts 20, 21, which are insertable into one another, each of which has a cup-shaped design with a tapered contour that extends slightly conically from the upper end of a respective side wall 32 to its lower end with the netlike webbing 18 attached thereto. A respective radially projecting flange 33 is located on the upper end of the sidewall in both frame parts 20, 21. This special design of the frame parts 20 or the assembled frame 15 makes possible a secure attachment between the adapter parts 26, 28. Based on the cup-shaped design, it is further possible that the netlike webbing 18 spans a through-opening 30 formed in the adapter 25 or it part 26, 28 on the corresponding face of the adapter part 28 in its contact plane 29, so that the netlike webbing 18 lies directly against the mold cavity.

(17) FIG. 6 shows further technically advantageous connecting techniques which are simple to use for serial production and in consideration of the specifications of the frame 15 including the netlike webbing 18 tensioned within the frame. The connection techniques are suitable for connecting the two U-shaped frame parts 20, 21, whereby preferably the U-leg 31 of the U-shaped frame 15 is shown as only one U-leg. It is to be recognized that a netlike webbing 18 having a through hole 19 is positioned between the frame parts 20, 21 and also extends in the region of the side walls 32 resting on one another, as well as the subsequent flanges 33 of the two frame parts 20, 21. In this region, the two frame parts 20, 21 are connected to one another in a clinching process by application of so-called TOX points 23. With this know connection technique, additional connection means are not needed and no heat is used for form-locking and punctiform connections made in a cold-forming process in the region of the flange 33, whereby the TOX points 34 are produced by applying a matrix stamped in a die with impression of the material layer lying between the matrix stamped and the die into the die. Based on the specialized form of the die, a corresponding material strength in the die area is provided, so that quasi push button type connections are formed. By means of the punctiform impression of the two flanges 33 including the netlike webbing 18 lying therebetween in the die used in the clinching process, the net tensioning is increased and is fixed accordingly after completion of the cold forming process.

(18) As discussed, it is sufficient for an improvement of the demolding process after termination of casting when frames are used only between individual pipe sections 12 of the casting flow runner system 11 with webbings 18 tensioned in the frames 15.

(19) Such a casting flow runner system 11 is shown schematically in FIG. 7. It comprises in the shown, simplified embodiment an inlet pipe 36 with an upper inlet opening 37. On the foot of the T-shaped inlet pipe 36, a pipe section 12 is connected, which is connected via an elbow or bend 12a with an ingate pipe 13 and on the other hand, with a pipe neck of the inlet pipe 36. A frame 15, and if necessary, with an adapter 25 is connected to the ends of each pipe section 12 or elbow 12a, respectively, in the connection to the ingate pipe 13 on the one hand and to the inlet pipe 36 on the other hand, which form a an effective predestined breaking point upon demolding.

(20) The two-part adapter is shown in FIG. 8. The adapter is provided between a pipe section 12 and a further pipe section attached thereto, such as an inlet pipe 36 or ingate pipe 13. The adapter part 26 is formed as described above with reference to FIG. 5. The other adapter part 28 has on its outer end a recess 35, in which a further pipe section can be inserted. The formation and fixing of the frame 15 made from the two frame parts 20, 21 corresponds to the embodiment shown and described with reference to FIGS. 5 and 6.

(21) 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.

(22) The specification incorporates by reference the disclosure of DE 20 2015 104 814.9, filed Sep. 10, 2015.

(23) 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.