VENTING DEVICE, CASTING DEVICE WITH VENTING DEVICE, VACUUM DIE-CASTING SYSTEM AND METHOD FOR OPERATING THE VACUUM DIE-VCASTING SYSTEM

Abstract

The invention relates to a venting device (01) for venting a casting chamber (11) by means of an evacuation device (12), wherein the venting device (01) has a base body (02) having an outflow channel (03) which is formed within the base body (02) and having an insertion portion (04) for being connected to the casting chamber (11) in a detachable and fluid-conducting manner and having a connection portion (05) for being connected to the evacuation device (12) in a detachable and fluid-conducting manner, wherein air can flow out through the outflow channel (03) when evacuating the casting chamber (11) and a filter unit (06) is disposed in the outflow channel (03). Furthermore, the invention relates to a casting device (10) comprising at least one casting chamber (11) having a casting chamber wall (13). Furthermore, the invention relates to a casting device (10) comprising at least one casting chamber (11) having a casting chamber wall (13), and to a vacuum-assisted pressure die casting system (100) having a casting device (10) and to a method for operating a vacuum-assisted pressure die casting system (100).

Claims

1. A venting device (01) for venting a casting chamber (11) by an evacuation device (12), wherein the venting device (01) has a base body (02) having an outflow channel (03) formed within the base body (02) and through which air flows out when evacuating the casting chamber (11), wherein the base body (02) has an insertion portion (04) for being connected to the casting chamber (11) in a detachable and fluid-conducting manner and a connection portion (05) for being connected to the evacuation device (12) in a detachable and fluid-conducting manner, wherein a filter unit (06) is disposed in the outflow channel (03).

2. The venting device according to claim 1, wherein the base body (02) is tubular.

3. The venting device according to claim 1, wherein the base body (02) has a step (08) formed between the insertion portion (04) and the connection portion (05).

4. The venting device according to claim 1, wherein the insertion portion (04) has an external thread (41) or the connection portion (05) has a clamping surface (51).

5. The venting device according to claim 1, wherein a transmission element (07) for transmitting a torque is disposed on the base body (02) in a torque-transmitting manner.

6. The venting device according to claim 1, wherein the filter unit (06) has a filter material which is permeable to air and made of steel.

7. The venting device according to claim 1, wherein the insertion portion (04) has a recess (42).

8. A casting device (10) comprising at least one casting chamber (11) having a casting chamber wall (13), wherein the casting chamber (11) has at least one filling hole (14) for introducing a melt into the casting chamber (11), at least one discharge hole (15) for discharging the melt from the casting chamber (11) and at least one vent hole (16), and wherein a venting device (01) according to claim 1 is insertable in the vent hole (16) and is detachably connectable to the casting chamber (11).

9. The casting device according to claim 8, wherein an internal thread (161) for screwing in the venting device (01) or a stop (162) which is brought into contact with the insertion portion (04) of the venting device (01) is formed in the vent hole (16).

10. The casting device according to claim 9, wherein a gap (17) between the stop (162) and the venting device (01) is impermeable to metal.

11. The casting device according to claim 8, wherein the vent hole (16) has a casting chamber recess (18) in the evacuation direction (A) of the detachable connection between the venting device (01) and the casting chamber (11).

12. A vacuum-assisted pressure die casting system (100) having a casting device (10) according to claim 8, characterized in that the melt is conveyable into the casting chamber (11) via the filling hole (14) and is supplyable to the vacuum-assisted pressure die casting system (100) via the discharge hole (15) of a cavity of a pressure die casting tool (101).

13. A method for operating a vacuum-assisted pressure die casting system (100) according to claim 12 comprising the following steps: Introducing a melt through the filling hole (14) into the casting chamber (11); Evacuating a gas contained within the casting chamber (11) via the vent hole (16) and the outflow channel (03) of the venting device (01); and Conveying the melt via the discharge hole (15) of the casting chamber (11) into a pressure die casting tool (101).

14. The method according to claim 13, wherein wherein the casting device (10) comprises an inspection for determining the degree of saturation of the filter unit (06) of the venting device (01).

15. The method according to claim 13, wherein the venting device (01) or the filter unit (06) is replaced regularly or depending on the degree of saturation of the filter unit (06).

Description

[0033] Further details, features and advantages of the invention are apparent from the following description of preferred embodiments in connection with the dependent claims. The respective features can be realized individually or in combination with each other. The invention is not limited to the embodiment. The embodiment is schematically illustrated in the figures. Identical reference signs in the individual figures designate similar elements, elements of similar functions or elements corresponding in terms of functionality.

[0034] FIG. 1 shows a schematic diagram of a vacuum-assisted pressure die casting system having a casting device and a venting device according to the invention; and

[0035] FIG. 2 shows a sectional view through a first embodiment of a venting device according to the invention; and

[0036] FIG. 3 shows a sectional view through the first embodiment of a venting device according to the invention mounted on the casting chamber of a casting device according to the invention; and

[0037] FIG. 4 shows the venting device according to the invention as shown in FIG. 3 with a second embodiment of a casting chamber of a casting device according to the invention; and

[0038] FIG. 5 shows a second embodiment of a venting device according to the invention having a casting chamber of a casting device according to the first embodiment.

[0039] FIG. 1 shows a schematic diagram of an example of a vacuum-assisted pressure die casting system 100 having a pressure die casting tool 101. This vacuum-assisted pressure die casting system comprises a casting device 10 having a casting chamber 11. Venting device 01 is disposed on casting chamber wall 13. For evacuating the air contained within casting chamber 11, venting device 01 is connected to first evacuation device 12, which is associated with casting chamber 11. A melt, preferably a metal melt 19, can be filled into casting chamber 11 via filling hole 14. How metal melt 19 enters casting chamber 11 is irrelevant with regard to the object of the invention. Furthermore, the necessary pressure for introducing metal melt 19 into pressure die casting tool 101 can be applied via casting plunger 20 and plunger rod 21. Pressure die casting tool 101 accordingly comprises cavity 102, which corresponds to the corresponding shape of the component to be manufactured. Again, it is irrelevant how the connection between casting chamber 11 and pressure die casting tool 101 or cavity 102 is designed, provided that the melt can be discharged from the casting chamber into cavity 102 of pressure die casting tool 101 via discharge hole 15 of the casting chamber.

[0040] A second evacuation device 103 is connected to cavity 102 to evacuate the gas contained within cavity 102. In this respect, evacuation devices 12 and 103 can be used to generate a negative pressure in casting chamber 11 and in pressure die casting tool 101 or cavity 102. It is obvious that one evacuation device can also be sufficient to remove unwanted air from the volume to be emptied from casting chamber 11 and cavity 102.

[0041] The exemplary embodiments of the venting device according to the invention and the interaction of venting device 01 with a casting chamber 11 and a casting device 10 according to the invention are shown in FIGS. 2 to 5.

[0042] As can be seen from FIGS. 2 to 5, venting device 01 has a base body 02 with an outflow channel 03 which is formed within base body 02 and through which air can flow out when casting chamber 11 is evacuated. Base body 02 has an insertion portion 04 and a connection portion 05, wherein a transmission element 07 formed in the manner of a multi-sided profile is disposed on insertion portion 04 and adjacent to connection portion 05. It can also be seen that insertion portion 04 is inserted into casting chamber wall 13 of casting chamber 11. At the end of insertion portion 04 inserted into vent hole 16 of casting chamber 11, an external thread 41 is formed, which interacts with an internal thread 161 of casting chamber wall 13 formed in a vent hole 16 to fasten venting device 01 to casting chamber 11. The depth of the insertion or the depth of screwing venting device 01 into casting chamber wall 13 is limited by stop 162. Stop 162 is designed as part of inner casting chamber wall 131 and has a thickness S in evacuation direction E. It can also be seen from FIGS. 2 to 5 that the base body is designed as a hollow cylindrical tube both in the area of insertion portion 04 and in the area of connection portion 05. Insertion portion 04 has a smaller inner diameter and a smaller outer diameter than connection portion 05. This results in a step 08 at the transition between connection portion 05 and insertion portion 04, transmission element 07 being able to come into contact against said step 08. Filter unit 06, which comprises a filter material in the form of steel chips, is disposed both inside insertion portion 04 and inside connection portion 05 of venting device 01. When the gas contained within casting chamber 11 of casting device 10 is evacuated, the gas thus flows through filter unit 06 in evacuation direction E, whereby entrained melt is retained in filter unit 06. Connection portion 05 has a clamping surface 51 on its outer surface, to which a connecting tube to evacuation device 12 can be clamped. Thus, both the connection between venting device 01 and evacuation device 12 and the connection between venting device 01 and casting chamber 11 of casting device 10 are designed to be detachable, so that venting device 01 can be easily removed or replaced.

[0043] The embodiment of a casting device 10 according to the invention shown in FIG. 4 differs from casting device 10 previously described in FIG. 3 only in that a casting chamber recess 18 is introduced into casting chamber wall 13 in the area of vent hole 16. Casting chamber recess 18 simplifies the insertion of venting device 01 into vent hole 16 as well as the positioning and screwing within vent hole 16. As can be seen from the illustration shown in FIG. 4, casting chamber recess 18 is inserted circumferentially into the inner circumference of vent hole 16 and extends in the axial direction, which coincides with evacuation direction E, from internal thread 161 to the outer wall surface of casting chamber 11.

[0044] Casting device 10 shown in FIG. 5 differs from casting device 10 shown in FIG. 3 only in that a recess 42 is provided in insertion portion 04. Recess 42 can be provided alternatively or additionally to casting chamber recess 18 shown in FIG. 4 and, as already explained with regard to casting chamber recess 18, facilitates the insertion and fastening of venting device 01 within vent hole 16 of casting chamber 11. As can be seen from the illustration shown in FIG. 5, recess 42 is disposed circumferentially in insertion portion 04. Furthermore, recess 42 is disposed adjacent to external thread 41 in the axial direction, which coincides with evacuation direction E when venting device 01 is mounted on casting chamber 11, and extends at least to outer casting chamber wall 132 of casting chamber 11 when venting device 01 is mounted on the casting chamber. In other words, the depth of the insertion of venting device 01 into casting chamber wall 13 corresponds to the axial extension of external thread 41 and recess 42.