EP2588261A1 - Method for filling the mold cavity of a pressure die casting device, valve arrangement and die casting device for carrying out the method - Google Patents
Method for filling the mold cavity of a pressure die casting device, valve arrangement and die casting device for carrying out the methodInfo
- Publication number
- EP2588261A1 EP2588261A1 EP11729302.7A EP11729302A EP2588261A1 EP 2588261 A1 EP2588261 A1 EP 2588261A1 EP 11729302 A EP11729302 A EP 11729302A EP 2588261 A1 EP2588261 A1 EP 2588261A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- casting
- compressed air
- press
- mold cavity
- valve
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000004512 die casting Methods 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000005266 casting Methods 0.000 claims abstract description 160
- 239000000463 material Substances 0.000 claims abstract description 83
- 239000007788 liquid Substances 0.000 claims abstract description 52
- 238000002347 injection Methods 0.000 claims abstract description 9
- 239000007924 injection Substances 0.000 claims abstract description 9
- 238000013022 venting Methods 0.000 claims description 41
- 229910052751 metal Inorganic materials 0.000 claims description 12
- 239000002184 metal Substances 0.000 claims description 12
- 239000012530 fluid Substances 0.000 claims description 6
- 230000001960 triggered effect Effects 0.000 claims description 4
- 238000009423 ventilation Methods 0.000 claims description 4
- 230000001105 regulatory effect Effects 0.000 claims description 2
- 239000007789 gas Substances 0.000 description 41
- 230000015572 biosynthetic process Effects 0.000 description 5
- 238000003825 pressing Methods 0.000 description 4
- 241000510097 Megalonaias nervosa Species 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 3
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052749 magnesium Inorganic materials 0.000 description 2
- 239000011777 magnesium Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
- B22D17/14—Machines with evacuated die cavity
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
- B22D17/08—Cold chamber machines, i.e. with unheated press chamber into which molten metal is ladled
- B22D17/10—Cold chamber machines, i.e. with unheated press chamber into which molten metal is ladled with horizontal press motion
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
- B22D17/20—Accessories: Details
- B22D17/32—Controlling equipment
Definitions
- the invention relates to a method for filling the mold cavity of a die casting device with liquid casting material, wherein the die casting device has a press-in piston, which is displaceable in a casting chamber, wherein the casting material is filled via a filling hole in the casting chamber and pressed by means of the press-in piston in the mold cavity.
- the invention relates to a valve assembly and a Druckg automatvorraum for carrying out the method.
- a pressure casting apparatus is known with a mold cavity which is connected via a filling channel with a casting chamber and via a venting channel with a gas outlet device.
- a press-in piston is slidable back and forth between a retracted position and an advanced position.
- liquid casting material can be filled into the casting chamber. This may be, for example, an aluminum or magnesium melt.
- the liquid casting material can be pressed by means of the injection piston via the filling channel into the mold cavity.
- Gas which is located in the mold cavity, so in particular air, can escape from the mold cavity via the vent channel.
- the vent channel is for this purpose in fluid communication with the gas outlet.
- the latter can for example be designed as a suction device.
- Object of the present invention is to develop a method of the generic type such that the risk of air and gas inclusions in the liquid casting material is reduced when pressed into the mold cavity.
- This object is achieved in a method of the type mentioned in the present invention that the casting material is applied in the casting chamber with compressed air.
- an overpressure is generated in the casting chamber while the liquid casting material is pressed into the mold cavity.
- compressed air is passed into the casting chamber. It has been shown that thereby a wave formation of the liquid casting material can be suppressed in a non-uniform feed movement of the injection piston as well as the formation of turbulence or a rollover of the liquid casting material.
- the overpressure acting on the casting material in the casting chamber ensures that even with a non-uniform movement of the press-in piston in the casting chamber, no strong waves of the liquid casting material form. Rather, the liquid level of the casting material remains fairly uniform, so that despite the pressurization of the casting material with compressed air, the risk of air or other gas inclusions can be considerably reduced.
- the compressed air is supplied to the casting chamber via the mold cavity. For supplying compressed air into the casting chamber thus no additional compressed air channels in the die casting apparatus are required.
- the pressure of the compressed air is preferably monitored.
- a pressure sensor can be used.
- the press-in piston is moved during a first press-in phase at a first feed rate and during a subsequent second press-in phase at a second feed rate, wherein the second feed rate is higher than the first feed rate.
- the casting material in the casting chamber is subjected to compressed air only during the first press-in phase.
- the loading of the casting material with compressed air takes place in such a configuration only during the relatively slow movement of the press-in piston, this slow movement usually ends when the liquid casting material has reached the filling channel or the inlet opening of the mold cavity. If this is the case, the admission of the casting material in the casting chamber is terminated with compressed air.
- a metal front contact sensor is arranged, which responds to the contact with casting material, and that the casting material is applied in the casting chamber as long as compressed air until the casting material Metal front contact sensor achieved.
- the metal front contact sensor can be arranged, for example, at the inlet of the filling channel or at its output.
- the metal front contact sensor When the liquid casting material reaches the metal front contact sensor, it sends a signal to a control device of the die casting device. Due to this signal, the admission of the casting material in the casting chamber can then be terminated with compressed air.
- the vent channel thus serves on the one hand to supply compressed air via the mold cavity and the filling channel of the casting chamber, on the other hand, the mold cavity can be sucked through the vent channel.
- the mold cavity is expediently sucked off as soon as a metal front contact sensor arranged in the filling channel, in particular at its inlet, responds to contact with liquid casting material.
- a metal front contact sensor arranged in the filling channel, in particular at its inlet
- the liquid casting material in the casting chamber can be subjected to compressed air.
- the application of compressed air takes so long until the metal front contact sensor, which is preferably arranged at the inlet of the filling channel, is in contact with liquid casting. material appeals.
- the mold cavity can be sucked through the vent channel.
- the piston movable in the casting chamber is reciprocable between a retracted position and an advanced position.
- the casting chamber can be filled via the filling hole with liquid casting material.
- the piston is moved to the advanced position, wherein it passes over the filling hole.
- the casting material in the casting chamber is only subjected to compressed air when the piston has passed over the filling hole of the casting chamber.
- the beginning of the pressurization can thus take place in dependence on the position of the piston in the casting chamber, for example, such that the casting chamber compressed air is supplied as soon as the piston has passed over the filling hole.
- the compressed air can then be supplied to the casting chamber in particular via the mold cavity and the filling channel.
- a signal is triggered as soon as the piston has run over the filling hole in the casting chamber, and then the casting material is pressurized in the liquid with compressed air.
- the signal may be provided, for example, by a displacement sensor coupled to the displaceable piston.
- the displacement sensor By means of the displacement sensor, the position of the piston can be detected in a structurally simple manner, and depending on the piston position, the admission of the casting material located in the casting chamber can be triggered with compressed air.
- a valve arrangement is connected to the outlet of a venting channel of the die-casting device having a first and a second port, wherein the first port is connected to a compressed air supply device and the second port to a gas outlet device, and wherein in a first Einpressphase in which the press-in piston is moved at a first feed speed, the flow connection from the outlet of the venting channel to the compressed air supply device is released and the flow connection from the outlet of the venting duct to the gas outlet device is interrupted, and wherein in a second press-in phase in which the press-in piston is moved at a second feed rate which is higher than the first feed rate, the flow connection from the outlet of the venting duct to the compressed air supply device interrupted and Flow connection is released from the outlet of the venting channel to the gas outlet.
- valve arrangement By means of the valve arrangement can be controlled in a simple manner, the pressurization of the liquid casting material within the casting chamber and the negative pressure of the casting material in the mold cavity.
- valve arrangement can be connected to the outlet of the venting channel of a conventional die casting apparatus. Elaborate conversion work can be dispensed with at the die casting machine and yet the risk of air and gas trapping in the casting material can be reduced.
- valve arrangement is controlled by means of sensors.
- the valve arrangement can have at least one electromagnetic valve which can be controlled electrically by a control device on the basis of sensor signals which are provided, for example, by a metal front contact sensor, a displacement sensor and / or a pressure sensor.
- the valve assembly is conveniently located at the outlet of a bleed valve of the die casting apparatus positioned in the bleed passage.
- the invention also relates to a valve arrangement for carrying out the above-explained method.
- the valve arrangement according to the invention comprises three connections, wherein a compressed air supply device can be connected to a first connection and the first connection via a compressed air supply line to the third connection in Flow connection is, and wherein a gas outlet device is connected to the second port and the second port is in fluid communication with the third port via a gas outlet, and wherein the output of a venting channel of the die-casting device can be connected to the third port.
- the preferred valve arrangement comprises two controllable valves, wherein the flow connection between the first and the third connection by means of a first controllable valve is selectively releasable and lockable and wherein the flow connection between the second and the third connection by means of the second controllable valve is selectively releasable and lockable ,
- valve arrangement according to the invention is preferably designed as an independently manageable unit.
- the valve arrangement can be connected to the outlet of the venting channel of a known die casting device and then makes it possible in a structurally simple way to pressurize the casting material in the casting chamber with compressed air and subsequently to remove the air in the mold cavity together with other gases from the mold cavity ,
- the supply of compressed air takes place as well as the delivery of air and gases via controllable valves.
- a first controllable valve controls the supply of compressed air to the casting chamber via the vent passage and the mold cavity
- the second controllable valve controls the delivery of air and gases from the mold cavity via the vent passage.
- the two controllable valves are alternatively opened and closed.
- the first controllable valve assumes its open position, then the flow connection between the compressed air supply device and the venting channel is free, so that compressed air can flow via the venting channel and the mold cavity to the casting chamber and charge the liquid casting material there.
- the second controllable valve is closed. Take the first controllable valve its
- the second controllable valve can assume its open position, so that a flow connection is established between the gas outlet device and the mold cavity, so that located in the mold cavity gases as well as compressed air can be removed.
- the gas outlet device can be designed, for example, in the form of a suction device or else in the form of an air outlet.
- the common connection line can be connected via the third connection directly to the outlet of the venting channel of the die casting device.
- a filter is preferably arranged in the gas outlet line.
- the invention also relates to a die casting apparatus for carrying out the method mentioned above.
- the die casting device according to the invention comprises a mold cavity which is connected via a filling channel with a casting chamber and a vent channel with a gas outlet, wherein in the casting chamber a press-in piston is slidably mounted and at the outlet of the venting channel a valve assembly of the type described above is arranged, wherein the third Connection of the valve assembly is connected to the outlet of the venting channel.
- valve arrangement according to the invention in a pressure casting device makes it possible to apply compressed air to the liquid casting material in the casting chamber in order to prevent the formation of waves, flashover or turbulence in the liquid casting material within the casting chamber.
- the mold cavity of the die casting apparatus can be connected via the valve arrangement to a gas outlet device during the further pressing in of the liquid casting material.
- a gas outlet device in the form of a suction device makes it possible here, with the mold cavity To apply negative pressure, in particular during the second press-in phase.
- the pressure casting apparatus preferably comprises a venting valve arranged in the venting channel with an outlet which forms the outlet of the venting duct.
- the third port of the valve assembly may be connected.
- the vent valve may be formed, for example, as a mechanical closing valve, in particular in the form of a piston valve.
- the vent valve comprises a narrow gap, solidifies in the liquid casting material.
- the venting valve is designed in the manner of a washboard valve.
- Such safety board valves are known per se to those skilled in the art and therefore require no further explanation in the present case.
- Figure 1 is a schematic representation of a die casting device according to the invention with a valve assembly according to the invention
- Figure 2 is an enlarged view of the valve assembly of Figure 1;
- Figure 3 is a schematic representation of a first embodiment
- FIGS. 5 is a schematic representation of a second embodiment of a vent valve of the die casting apparatus of Figure 1;
- Figures 6 and 7 are schematic representations of casting chambers of conventional die casting apparatus wherein the liquid casting material in the casting chamber forms waves, flashover or turbulence.
- a die casting device 10 is shown schematically with a mold cavity 12 which is connected via a filling channel 14 with a casting chamber 16, in which a press-in piston 18 is slidably mounted.
- liquid casting material for example an aluminum or magnesium melt
- the Einpresskolbenl8 takes in a known manner its retracted position, so that the casting material can get into the casting chamber 16 without being hindered by the injection piston 18. If the press-in piston 18 is displaced from its retracted position to its advanced position, then the liquid casting material 22 located in the casting chamber 16 is pressed into the mold cavity 12 via the filling channel 14.
- Casting chambers of the above-explained type are often referred to as Basing channel 14
- gases and air can be delivered to a known per se and therefore not shown in the drawing to achieve a better overview gas outlet, for example, to a suction device or an air vent.
- the mold cavity 12 is in fluid communication via a venting channel 24 with a valve arrangement 26 according to the invention which is shown enlarged in FIG.
- the latter comprises a first controllable valve, which is referred to below as the air inlet valve 28, and a second controllable valve, which is referred to below as the gas outlet valve 30.
- the two valves 28, 30 are in the form of solenoid valves and can be controlled electrically by a control device of the die casting device 10. Such controllers are known in the art and therefore not shown in the drawing to achieve a better overview.
- the Einpresskolbens 18 is driven by means of a known per se and therefore only roughly schematically illustrated in the drawing Einpresssystems 19. With the help of Einpresssystems 19, the press-in piston 18 can be moved back and forth in the casting chamber 16 and acted upon by high mechanical pressure.
- the input of the air inlet valve 28 forms a first port 32 of the valve assembly 26.
- a first line 33 is connected, via which the valve assembly 26 connected to a known per se and therefore to achieve a better overview in the drawing compressed air supply device is.
- the compressed air supply device may for example have a compressor or a compressed air reservoir.
- the outlet of the gas outlet valve 30 forms a second port 34 of the valve assembly 26.
- a second line 35 Connected to the second connection 34 is a second line 35, via which the valve arrangement 26 is in flow communication with a gas outlet device.
- the gas outlet device can be designed, for example, in the form of a suction device or else in the form of an air outlet. Such gas outlet devices are known per se to those skilled in the art.
- the valve arrangement 26 has a third connection 36, which is connected directly to an outlet 38 of the ventilation channel 24.
- the third port 36 is disposed on a valve block 40 of the valve assembly 26.
- the valve block 40 forms the third port 36 adjacent to a connecting line 42 to which a compressed air supply line 44 connects in the direction of the air inlet valve 28, via which the connecting line 42 is in flow communication with the air inlet valve 28.
- a gas outlet line 46 connects to the connecting line 42, via which the connecting line 42 with the gas outlet valve 30 is in flow communication.
- a filter 48 is arranged in the gas outlet 46.
- a vent valve is arranged in the venting channel 24.
- a first embodiment of a venting valve is shown schematically in FIG. 3 and identified by the reference numeral 50. It has a flow labyrinth 51, via which the mold cavity 12 is in flow communication with the valve arrangement 26. If liquid casting material enters the flow labyrinth, it solidifies within the flow labyrinth and therefore can not escape from the venting channel 24. If the venting valve 50 is positioned in the venting channel 24, the outlet of the venting valve 50 forms the outlet 38 of the venting channel 24.
- vent valve 54 shows an alternative embodiment of a vent valve is shown schematically, which is occupied by the reference numeral 54 in total. It is designed in the manner of a washboard valve, which is known per se to the person skilled in the art. By means of such washboard valves can also be prevented that liquid casting material emerges from the vent passage 24. If the venting valve 54 is positioned in the venting channel 24, then the outlet of the venting valve 54 forms the outlet 38 of the venting channel 24.
- the valve arrangement 26 can preferably be mounted directly on the venting valve 50 or on the venting valve 54.
- the valve block 40 and in particular the geometry of the connecting line 42 can be adapted to the outlet of the venting valve 50 or 54 for this purpose.
- the mold cavity 12 is closed and then liquid casting material is poured into the casting chamber 16 via the filling hole 20, wherein the press-in piston 18 assumes its retracted position.
- the injection piston 18 is then during a first Einpressphase at a relatively low speed in the direction of filling channel 14 postponed. If the press-fit piston 18 has run over the filling hole, a signal is triggered and then the air inlet valve 28 is opened so that compressed air flows via the compressed air supply line 44, the venting channel 24, the mold cavity 12 and the filling channel 14 into the casting chamber 16 and into the casting chamber 16 located liquid casting material can pressurize.
- a metal front contact sensor 56 is arranged, which is connected via a signal line 57 with the control device of the die casting device 10, not shown in the drawing. If the liquid casting material encounters the metal front contact sensor 56 with increasing feed movement of the press-fit piston 18, this provides a signal which results in the air inlet valve 28 being closed.
- the gas outlet valve 30 is opened, so that the mold cavity 12 is in fluid communication with the gas outlet device connected to the second connection 34 of the valve arrangement 26 via the venting channel 24 and the gas outlet line 46. It can be provided that the gas outlet device has a suction device, so that the mold cavity 12 can be subjected to negative pressure during the further pressing of the liquid casting material.
- the press-fit piston 18 has a relatively low feed rate during the first press-in phase.
- the first press-in phase ends with the liquid casting material reaching the metal front contact sensor 56.
- the speed of the press-fit piston 18 is greatly increased and during a second press-in phase, the liquid casting material is pressed by the injection piston 18 via the filling channel 14 into the mold cavity 12.
- the mold cavity as explained above, can be sucked off.
- the supply of compressed air via the air inlet valve 28 and the compressed air supply line 44 can be monitored by means of a pressure sensor 59 which is in fluid communication with the compressed air supply line 44 via a branch line 60.
- the pressurization of the liquid casting material 22 in the G motherboard 30 with compressed air ensures that form in the casting chamber 16 no large waves of liquid casting material 22 and the liquid casting material 22 also does not overturn or turbulence forms. Such corrugation, flashover or turbulence in the liquid casting material 22 could result in air and gases being trapped in the liquid casting material 22.
- Figures 5, 6 and 7 illustrate such conditions of liquid casting material 122 which may form in the casting chambers 116 of conventional die casting devices, particularly when the known press-in piston 118 performs non-uniform advancing movement. The formation of such conditions is avoided by the inventive loading of the liquid casting material with compressed air. The risk that air and other gases are trapped in the casting chamber 16 in the liquid casting material 22 can thereby be kept very low.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
- Casting Devices For Molds (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE202010009838U DE202010009838U1 (en) | 2010-07-03 | 2010-07-03 | Vent block for vacuum back pressure |
PCT/EP2011/061053 WO2012004192A1 (en) | 2010-07-03 | 2011-06-30 | Method for filling the mold cavity of a pressure die casting device, valve arrangement and die casting device for carrying out the method |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2588261A1 true EP2588261A1 (en) | 2013-05-08 |
EP2588261B1 EP2588261B1 (en) | 2017-05-03 |
Family
ID=43662878
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP11729302.7A Active EP2588261B1 (en) | 2010-07-03 | 2011-06-30 | Method for filling the mold cavity of a pressure die casting device, valve arrangement and die casting device for carrying out the method |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP2588261B1 (en) |
DE (1) | DE202010009838U1 (en) |
ES (1) | ES2635341T3 (en) |
WO (1) | WO2012004192A1 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102013103672A1 (en) | 2013-04-11 | 2014-10-30 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Pore-cast |
DE102014113570B3 (en) * | 2014-09-19 | 2015-12-24 | Ksm Castings Group Gmbh | Device for measuring pressures in a melt-fillable mold cavity of a casting mold, in particular a vacuum die casting mold |
JP7215409B2 (en) | 2019-12-19 | 2023-01-31 | トヨタ自動車株式会社 | casting method |
CN114799131A (en) * | 2022-04-22 | 2022-07-29 | 南京航空航天大学 | Negative pressure drainage type casting and forging forming device and method for metal material |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3142081A1 (en) | 1981-04-22 | 1983-05-11 | Karl Dipl.-Ing. 7000 Stuttgart Göhring | Die-casting machine |
US5219409A (en) | 1992-04-27 | 1993-06-15 | Outboard Marine Corporation | Vacuum die casting process |
US5566743A (en) * | 1994-05-02 | 1996-10-22 | Guergov; Milko G. | Method of injecting molten metal into a mold cavity |
CH689446A5 (en) | 1995-03-24 | 1999-04-30 | Alusuisse Lonza Services Ag | Continuous casting mould of modular construction |
ATE200638T1 (en) | 1996-09-05 | 2001-05-15 | Electronics Gmbh | DIE CASTING APPARATUS AND DIE CASTING METHOD |
-
2010
- 2010-07-03 DE DE202010009838U patent/DE202010009838U1/en not_active Expired - Lifetime
-
2011
- 2011-06-30 ES ES11729302.7T patent/ES2635341T3/en active Active
- 2011-06-30 WO PCT/EP2011/061053 patent/WO2012004192A1/en active Application Filing
- 2011-06-30 EP EP11729302.7A patent/EP2588261B1/en active Active
Also Published As
Publication number | Publication date |
---|---|
EP2588261B1 (en) | 2017-05-03 |
ES2635341T3 (en) | 2017-10-03 |
WO2012004192A1 (en) | 2012-01-12 |
DE202010009838U1 (en) | 2011-02-24 |
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