EP3450049A1 - Pressure die casting device and method for lubricating a plunger - Google Patents
Pressure die casting device and method for lubricating a plunger Download PDFInfo
- Publication number
- EP3450049A1 EP3450049A1 EP17188556.9A EP17188556A EP3450049A1 EP 3450049 A1 EP3450049 A1 EP 3450049A1 EP 17188556 A EP17188556 A EP 17188556A EP 3450049 A1 EP3450049 A1 EP 3450049A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- casting
- lubricant
- piston
- die
- chamber
- 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 39
- 238000000034 method Methods 0.000 title claims description 17
- 230000001050 lubricating effect Effects 0.000 title claims description 6
- 238000005266 casting Methods 0.000 claims abstract description 182
- 239000000314 lubricant Substances 0.000 claims abstract description 133
- 239000000463 material Substances 0.000 claims abstract description 23
- 239000002184 metal Substances 0.000 claims abstract description 10
- 229910052751 metal Inorganic materials 0.000 claims abstract description 10
- 150000002739 metals Chemical class 0.000 claims abstract 2
- 239000000155 melt Substances 0.000 description 19
- 238000002347 injection Methods 0.000 description 5
- 239000007924 injection Substances 0.000 description 5
- 238000005461 lubrication Methods 0.000 description 4
- 239000012791 sliding layer Substances 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 229910001338 liquidmetal Inorganic materials 0.000 description 2
- 238000005058 metal casting Methods 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000006735 deficit Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000012943 hotmelt Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
Images
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
- B22D17/20—Accessories: Details
- B22D17/2015—Means for forcing the molten metal into the die
- B22D17/203—Injection pistons
-
- 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
- B22D17/14—Machines with evacuated die cavity
- B22D17/145—Venting means therefor
-
- 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
- B22D17/2015—Means for forcing the molten metal into the die
- B22D17/2038—Heating, cooling or lubricating the injection unit
Definitions
- the present invention relates to a device for die-casting a casting material, and to a method for lubricating a casting piston.
- the device according to the invention is designed for pressure casting of a cast material and in particular for pressure casting of metals.
- the device comprises a casting chamber with a filling opening for the casting material, a casting piston which can be displaced in the casting chamber and which is designed to dispense the casting material into a mold cavity connected to the casting chamber.
- the device further comprises a lubricant channel having an inlet and an outlet, wherein the outlet of the lubricant channel opens into the casting chamber.
- the device comprises a lubricant device, which is designed to introduce a lubricant into the inlet of the lubricant channel.
- a molten metal is filled through a filling opening in a casting chamber. Subsequently, the casting piston guided within the casting chamber is moved in the longitudinal direction of the casting chamber in the direction of the mold cavity in order to shoot the liquid metal out of the casting chamber into a mold cavity.
- the lateral surface of the casting piston is usually as close as possible to the inner surface the casting chamber, wherein a gap must remain to ensure the displaceability of the casting piston.
- the lubricant is introduced into the casting chamber via the lubricant channel, so that it can at least partially reach between the lateral surface of the casting piston and the inner surface of the casting chamber and form a sliding layer there.
- the die casting device has a compressed air device for introducing compressed air into the inlet of the lubricant channel.
- a lubricant previously introduced into the lubricant channel can be conveyed almost completely out of the lubricant channel into the casting chamber and there contribute to the production of a sliding layer. It can therefore be introduced in particular a precisely metered amount of lubricant in the lubricant channel, being ensured by the compressed air device according to the invention is that the precisely metered amount also almost completely enters the casting chamber and there contributes to the lubrication.
- the compressed air device according to the invention ensures that a precisely metered amount of lubricant introduced into the lubricant channel is conveyed almost completely out of the lubricant channel and into the casting chamber in order to contribute to the lubrication there.
- Another significant advantage of the present invention is that after the introduction of compressed air into the inlet of the lubricant channel no lubricant residues are more in the lubricant channel. It has been recognized within the scope of the invention that the lubricant residues remaining in the lubricant channel can lead to problems with die-cast devices known from the prior art. This is especially true when a vacuum is generated to improve the casting quality in the casting chamber and / or in the associated mold cavity prior to the injection of the melt. In this case, namely in known from the prior art die casting devices lubricant residues, which are in the lubricant passage, are sucked in the generation of the vacuum in the casting chamber, so that a larger amount of lubricant undesirably comes into contact with the melt.
- the die-casting device according to the invention allows an almost complete blowing out of the lubricant channel, so that there is no undesired sucking in of lubricant in a subsequent vacuum generation.
- the casting piston may have a diameter between 2 cm and 16 cm, preferably between 3.5 cm and 14 cm, more preferably between 5 cm and 12 cm.
- the lubricant channel may have a diameter between 2 mm and 15 mm, preferably between 4 mm and 12 mm, more preferably between 6 mm and 10 mm.
- the lubricant channel extends through the casting piston.
- the lubrication of the casting piston by means of a lubricant channel running through the casting piston itself is advantageous, since the lubricant and the compressed air in this case can be applied during a movement of the casting piston within the casting chamber, so that the lubricant is distributed within the casting chamber.
- outlet of the lubricant channel is preferably arranged in the lateral surface of the casting piston.
- the lubricant can be applied in this case in the region of the lateral surface and form there directly a sliding layer.
- the casting piston can also have a circumferential groove around its circumferential surface, wherein the outlet of the lubricant channel opens into the annular groove.
- the lubricant discharged by the compressed air can thus move around the casting piston, which further improves the distribution of the lubricant within the casting chamber.
- the die-casting device comprises a piston rod connected to the casting piston, wherein the lubricant channel extends through the piston rod.
- the piston rod is preferably fixedly connected to the casting piston. It serves to move the piston within the casting chamber.
- the piston rod usually passes through a piston rod opening in the casting chamber.
- the compressed air device is connected via a first valve with the lubricant channel. It is also advantageous if the lubricant device is connected via a second valve with the lubricant channel.
- the use of valves allows the lubricant and the compressed air to be introduced into the lubricant channel separately from one another without the lubricant device and the pneumatic device influencing each other. In particular, it can be avoided that the lubricant is forced back into the lubricant device by the compressed air.
- the die casting device has a vacuum device, which is designed for evacuation of the casting chamber and / or the mold cavity.
- a vacuum device for example, after filling the melt, a vacuum can be generated within the casting chamber and within the mold cavity. There are then no more gases in the casting chamber, which could be pressed in the subsequent injection of the melt in the mold cavity and enclosed within the casting. The casting quality is thereby increased significantly. Due to the compressed air device according to the invention can be ensured before generating the vacuum that the lubricant channel is free of lubricant residues. It will then retracted during generation of the vacuum no lubricant residues in the casting chamber. The casting quality can be further increased in this way.
- the die casting device comprises a cover, which is designed for vacuum-tight closing of the filling opening.
- the cover preferably has a supply line to the vacuum device. Via the supply line, when the cover closes the filling opening, a vacuum can be generated in the interior of the casting chamber.
- the feed line can have a large cross section, for example, the cross section of the feed line can be between 20 mm and 40 mm, so that the pouring chamber can be evacuated via the feed line and the filling opening using a large volume flow. If large volume flows are used for evacuation, it is particularly important that there are no lubricant residues in the lubricant channel due to the associated strong "suction effect".
- the cover may define a vacuum-tight interior space between it and the casting chamber, with an area of the piston rod adjacent to the casting chamber preferably being located in the interior.
- the cover may have a grommet for the piston rod.
- the cover may be designed to be displaceable, wherein a vacuum-tight closure of the filling opening is achieved by a displacement of the cover.
- the casting chamber therefore has an adjacent to the mold cavity rear wall with a passage leading to the mold cavity for the casting material, wherein the casting piston for shooting the casting material is displaceable up to an end position, wherein in the end position of the casting piston between the casting piston and the Back wall a clearance exists.
- Liquid metal can enter the free space when the melt is melted in, which possibly cools prematurely there, but is not conveyed into the mold cavity due to the free space in the end position of the casting piston (ie in a position in which the casting piston is closest to the mold cavity) , The introduction prematurely cooled casting material in the mold cavity is thus avoided or at least reduced.
- the free space may occupy a volume between 10 and 160 cm 3 , preferably between 30 and 120 cm 3 , more preferably between 50 and 90 cm 3 .
- the clearance is preferably arranged in a region of the casting chamber which extends from the bottom of the casting chamber to a height of less than 80% of the casting chamber, preferably to a height of less than 70%, more preferably of less than 60%. This is advantageous, since the casting chamber is usually filled with the casting material only up to a certain height, so that the molten metal comes into contact with the casting piston after filling in the lower region of the casting chamber.
- the free space is formed by a recess in the casting piston.
- the recess can be formed by an oblique section of a front surface of the casting piston.
- the front surface refers to the facing in the direction of the mold cavity surface of the casting piston.
- the free space according to the invention may have an independent inventive content.
- An above-described device for die-casting a casting material which has the above-mentioned free space can thus be an object of the present invention independently of the lubricant channel, lubricant device and compressed-air device.
- step a a quantity of lubricant between 0.1 ml and 1.4 ml, preferably between 0.2 ml and 1 ml, more preferably between 0.4 ml and 0.6 ml introduced into the lubricant channel.
- the compressed air in step b. over a period of between 0.5 and 5 seconds, preferably between 2 and 3 seconds introduced into the entrance of the lubricant channel.
- the lubricant and / or the compressed air is introduced during retraction of the casting piston.
- the lubricant and / or the compressed air is introduced into the lubricant channel after the melt has been injected.
- the casting piston is near the end position (ie in a position adjacent to the mold cavity).
- the lubricant may be distributed across the lubricant passage throughout the casting piston.
- FIG. 1 shows a schematic illustration of a die-casting device according to the invention after filling a molten metal 15.
- the die-casting device has a casting chamber 13 with a filling opening 14 and a rear wall 51 on.
- the rear wall 51 is provided with a passage 52.
- a casting piston 16 is arranged, which is fixed to a piston rod 22.
- the casting chamber also has a piston rod opening 50, through which the piston rod 22 is passed.
- a Force are exerted on the piston rod 22.
- the casting piston 16 has a diameter of 6 cm. The piston stroke, so the maximum distance that can be moved, the casting piston is about 40 cm.
- the interior of the casting chamber 13 is connected via the passage 52 with a mold cavity 18, which consists of two mold halves 19, 20.
- a molten metal 15 is filled.
- the casting piston 16 may consist of a in FIG. 1 shown initial position to be moved to an end position in the direction of the mold cavity 18 within the casting chamber 13. In this case, the casting piston 16 displaces the molten metal 15 and presses it through the passage 52 into the mold cavity 18. This process is also referred to as "shooting in" of the melt 15 into the mold cavity 18.
- Within the mold halves 19, 20 arises after cooling of the molten metal, a casting.
- the casting piston 16 has a recess 43, which is formed by an oblique gate of a front surface 42 of the casting piston 16. After filling the melt 15 into the casting chamber 13, the melt 15 comes into contact with the casting piston 16. In the vicinity of the casting piston, premature cooling of the melt 15 may occur. To shoot the melt 15 of the casting piston 16 in the in FIG. 3 moved shown end position. Due to the recess 43 exists in the final position between the casting piston 16 and the rear wall 51, a free space 53, can enter into the early cooled cast material. The early cooled casting material is thus not conveyed into the mold cavity 18. The casting quality is thus not or at least less affected by early cooled cast material.
- the lateral surface of the casting piston 16 abuts the inner surface 17 of the casting chamber 13 as closely as possible, but there is a gap 21 between the lateral surface and the inner surface 17 in order to permit movement of the casting piston 16.
- the casting piston 16 is guided in this way within the casting chamber 13.
- a lubricant channel 23 extends through both the piston rod 22, and by the casting piston 16.
- the diameter of the lubricant channel is about 6 mm.
- the lubricant channel 23 branches into a total of 10 outlets, of which the two outlets 49 can be seen in the sectional view.
- the outputs open into an annular groove 24. In the region of the branches, the lubricant channel may have a smaller diameter.
- the annular groove 24 extends around the lateral surface of the casting piston 16 around.
- the die-casting device further has a lubricant device 28, which is connected via a valve 26 and a feed line 44 to an inlet 25 of the lubricant channel 23.
- the lubricant device 28 may be formed by a lubricant reservoir and a lubricant pump.
- a compressed air device 29 is present, which is connected via a valve 27 and a supply line 45 to the input 25.
- the compressed air device 29 may comprise a compressed air tank and is designed to provide compressed air at a pressure of 7 bar over a period of at least 3 s.
- the lubricant device 28 is designed to introduce a precisely metered amount of a lubricant via the valve 26 into the inlet 25 of the lubricant channel 23.
- the compressed air device 29 is adapted to over the Valve 27 compressed air in the inlet 25 of the lubricant channel 23 introduce.
- the die-casting device further comprises a cover 35, which defines an inner space 36 between the cover 35 and the casting chamber 13 and which is displaceable in the longitudinal direction of the casting chamber 13.
- the filling opening 14 can be closed vacuum-tight (see FIG. 2 ).
- the cover hood seals on the side facing the molded part with a seal arranged between the filling opening 14 and the molded part half 20, which extends circumferentially around the outer wall of the casting chamber.
- the cover 35 may also seal with a seal which is arranged directly on the molded part half 20 or a machine plate arranged there (not shown in the figures).
- the cover On the opposite side, the cover has a grommet 38, through which the piston rod 22 is guided. A portion 37 of the piston rod 22 is located in the interior 36, so that in an evacuation of the casting chamber 13 no or little outside air is sucked through the gap in the region of the piston rod opening 50 into the casting chamber 13.
- the cover 35 also has a connection 39, which is connected via a line 40 and a valve 41 to a vacuum device 30.
- the vacuum device 30 is also connected via a feed line 31 and a valve 32 to the mold cavity 18.
- the sequence of a method according to the invention is in the sequence of FIGS. 1 to 5 illustrated.
- FIG. 1 the state of the device after the melt 15 has been filled into the casting chamber 13.
- the lubricant valve 26 and the compressed air valve 27 are closed.
- the cover 35 is first moved over the filling opening 14, so that the inner space 36 and the casting chamber 13 are sealed vacuum-tight. This condition is in FIG. 2 shown.
- the valve 41 can now be opened so that the vacuum device 30 can generate a vacuum via the connection 39 and the line 40 in the interior 36 as well as in the interior of the casting chamber 13.
- the valve 32 is preferably still closed at this time.
- FIG. 3 shows the state of the device after the injection of the melt into the mold cavity 18, wherein the casting piston 16 is here in the end position.
- the lubricant valve 26 is opened and introduced via the lubricant means 28, a lubricant drop 46, which has an amount of about 0.6 ml, in the inlet 25 of the lubricant channel 23.
- a lubricant drop 46 which has an amount of about 0.6 ml, in the inlet 25 of the lubricant channel 23.
- the lubricant valve 26 can be closed.
- the cover 35 can be opened again.
- the casting piston 16 is withdrawn starting from the end position.
- the compressed air valve 27 is opened.
- the compressed air device 29 now brings compressed air into the inlet 25 of the lubricant channel 23.
- the lubricant drop 45 is pressurized by the compressed air which is in FIG. 5 is indicated by the wavy lines 48, conveyed through the lubricant channel 23 through to the output 49, which is located in the region of the annular groove 24 arranged in the casting piston 16.
- the lubricant drop 46 is distributed in this way during the retraction of the casting piston 16 within the casting chamber 13 and uniformly applied to the inner wall of the casting chamber 13.
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Abstract
Die Erfindung betrifft eine Vorrichtung zum Druckgießen eines Gussmaterials (15), insbesondere zum Druckgießen von Metallen, umfassend eine Gießkammer (13) mit einer Einfüllöffnung (14) für das Gussmaterial (15), einen in der Gießkammer (13) verschiebbaren Gießkolben (16) zur Ausbringung des Gussmaterials (15) in einen mit der Gießkammer (13) verbundenen Formhohlraum, einen in die Gießkammer mündenden Schmiermittelkanal (23) und eine Schmiermitteleinrichtung (28) zur Einbringung eines Schmiermittels (46) in den Schmiermittelkanal. Erfindungsgemäß weist die Druckgussvorrichtung weiterhin eine Drucklufteinrichtung (29) zur Einbringung von Druckluft in den Eingang (25) des Schmiermittelkanals (23) auf. Mit Hilfe der erfindungsgemäßen Druckluftvorrichtung kann eine genau dosierte Schmiermittelmenge zuverlässig innerhalb der Gießkammer ausgebracht werden, ohne dass Schmiermittelreste im Schmiermittelkanal verbleiben. The invention relates to a device for diecasting a cast material (15), in particular for die casting of metals, comprising a casting chamber (13) with a filling opening (14) for the casting material (15), a casting piston (16) displaceable in the casting chamber (13). for applying the casting material (15) into a mold cavity connected to the casting chamber (13), a lubricant channel (23) opening into the casting chamber and a lubricant device (28) for introducing a lubricant (46) into the lubricant channel. According to the invention, the die casting device further comprises a compressed air device (29) for introducing compressed air into the inlet (25) of the lubricant channel (23). With the aid of the compressed air device according to the invention, a precisely metered amount of lubricant can be reliably applied within the casting chamber without lubricant residues remaining in the lubricant channel.
Description
Die vorliegende Erfindung betrifft eine Vorrichtung zum Druckgießen eines Gussmaterials, sowie ein Verfahren zum Schmieren eines Gießkolbens.The present invention relates to a device for die-casting a casting material, and to a method for lubricating a casting piston.
Die erfindungsgemäße Vorrichtung ist zum Druckgießen eines Gussmaterials und insbesondere zum Druckgießen von Metallen ausgebildet. Die Vorrichtung umfasst eine Gießkammer mit einer Einfüllöffnung für das Gussmaterial, einen in der Gießkammer verschiebbaren Gießkolben, welcher zur Ausbringung des Gussmaterials in einen mit der Gießkammer verbundenen Formhohlraum ausgebildet ist. Die Vorrichtung umfasst weiterhin einen Schmiermittelkanal mit einem Eingang und einem Ausgang, wobei der Ausgang des Schmiermittelkanals in die Gießkammer mündet. Zudem umfasst die Vorrichtung eine Schmiermitteleinrichtung, welche zur Einbringung eines Schmiermittels in den Eingang des Schmiermittelkanals ausgebildet ist.The device according to the invention is designed for pressure casting of a cast material and in particular for pressure casting of metals. The device comprises a casting chamber with a filling opening for the casting material, a casting piston which can be displaced in the casting chamber and which is designed to dispense the casting material into a mold cavity connected to the casting chamber. The device further comprises a lubricant channel having an inlet and an outlet, wherein the outlet of the lubricant channel opens into the casting chamber. In addition, the device comprises a lubricant device, which is designed to introduce a lubricant into the inlet of the lubricant channel.
Beim Druckgießen von Metallen wird eine Metallschmelze über eine Einfüllöffnung in eine Gießkammer gefüllt. Anschließend wird der innerhalb der Gießkammer geführte Gießkolben in Längsrichtung der Gießkammer in Richtung des Formhohlraums bewegt, um das flüssige Metall aus der Gießkammer hinaus in einen Formhohlraum einzuschießen. Die Mantelfläche des Gießkolbens liegt üblicherweise möglichst dicht an der Innenfläche der Gießkammer an, wobei ein Spalt verbleiben muss, um die Verschiebbarkeit des Gießkolbens zu gewährleisten.When pressure casting of metals, a molten metal is filled through a filling opening in a casting chamber. Subsequently, the casting piston guided within the casting chamber is moved in the longitudinal direction of the casting chamber in the direction of the mold cavity in order to shoot the liquid metal out of the casting chamber into a mold cavity. The lateral surface of the casting piston is usually as close as possible to the inner surface the casting chamber, wherein a gap must remain to ensure the displaceability of the casting piston.
Aus dem Stand der Technik ist es bekannt, den Gießkolben zu schmieren, um eine gleichmäßige Gleitbewegung des Kolbens innerhalb der Gießkammer zu ermöglichen. Das Schmiermittel wird dazu über den Schmiermittelkanal in die Gießkammer eingebracht, so dass es zumindest teilweise zwischen die Mantelfläche des Gießkolbens und die Innenfläche der Gießkammer gelangen und dort eine Gleitschicht bilden kann.From the prior art it is known to lubricate the casting piston to allow a smooth sliding movement of the piston within the casting chamber. For this purpose, the lubricant is introduced into the casting chamber via the lubricant channel, so that it can at least partially reach between the lateral surface of the casting piston and the inner surface of the casting chamber and form a sliding layer there.
Vorbekannte Vorrichtungen haben häufig das Problem, dass sich die Schmiermittelmenge schlecht dosieren lässt. Vor diesem Hintergrund ist es die Aufgabe der vorliegenden Erfindung, eine Druckgussvorrichtung sowie ein Verfahren zum Schmieren eines Gießkolbens bereitzustellen, welche eine bessere Dosierung des verwendeten Schmiermittels ermöglichen.Previous devices often have the problem that the amount of lubricant can be metered bad. Against this background, it is the object of the present invention to provide a die casting apparatus and a method for lubricating a casting piston, which allow a better dosage of the lubricant used.
Gelöst wird diese Aufgabe mit den Merkmalen der unabhängigen Ansprüche. Vorteilhafte Ausführungsformen sind in den Unteransprüchen beschrieben.This object is achieved with the features of the independent claims. Advantageous embodiments are described in the subclaims.
Erfindungsgemäß weist die Druckgussvorrichtung eine Drucklufteinrichtung zur Einbringung von Druckluft in den Eingang des Schmiermittelkanals auf.According to the invention, the die casting device has a compressed air device for introducing compressed air into the inlet of the lubricant channel.
Durch die erfindungsgemäße Drucklufteinrichtung kann ein zuvor in den Schmiermittelkanal eingebrachtes Schmiermittel nahezu vollständig aus dem Schmiermittelkanal in die Gießkammer befördert werden und dort zur Herstellung einer Gleitschicht beitragen. Es kann also insbesondere eine genau dosierte Menge Schmiermittel in den Schmiermittelkanal eingebracht werden, wobei durch die erfindungsgemäße Drucklufteinrichtung sichergestellt wird, dass die genau dosierte Menge auch nahezu vollständig in die Gießkammer gelangt und dort zur Schmierung beiträgt.By means of the compressed air device according to the invention, a lubricant previously introduced into the lubricant channel can be conveyed almost completely out of the lubricant channel into the casting chamber and there contribute to the production of a sliding layer. It can therefore be introduced in particular a precisely metered amount of lubricant in the lubricant channel, being ensured by the compressed air device according to the invention is that the precisely metered amount also almost completely enters the casting chamber and there contributes to the lubrication.
Im Rahmen der Erfindung wurde erkannt, dass bei aus dem Stand der Technik bekannten Druckgussvorrichtungen häufig das in den Schmiermittelkanal eingebrachte Schmiermittel nicht vollständig in die Gießkammer befördert wird, sondern teilweise im Schmiermittelkanal verbleibt. Dies kann unter Umständen dazu führen, dass die zur Schmierung beitragende Schmiermittelmenge nicht ausreichend ist. Bei zu geringer Schmiermittelmenge kann es dann zu "ruckeligen" Kolbenbewegungen oder zu sogenannten "Kolbenklemmern" kommen, was mechanische Belastungen erzeugt und die Qualität des Gussteils beeinträchtigt.In the context of the invention, it has been recognized that in die casting devices known from the prior art, the lubricant introduced into the lubricant channel is often not completely conveyed into the casting chamber, but partly remains in the lubricant channel. Under certain circumstances, this may result in insufficient lubrication lubricant. If the amount of lubricant is too low, then "jerky" piston movements or so-called "piston clamps" can occur, which generates mechanical stresses and impairs the quality of the casting.
Durch die erfindungsgemäße Druckluftvorrichtung wird hingegen sichergestellt, dass eine genau dosierte in den Schmiermittelkanal eingebrachte Schmiermittelmenge nahezu vollständig aus dem Schmiermittelkanal hinaus und in die Gießkammer hinein befördert wird, um dort zur Schmierung beizutragen.The compressed air device according to the invention, however, ensures that a precisely metered amount of lubricant introduced into the lubricant channel is conveyed almost completely out of the lubricant channel and into the casting chamber in order to contribute to the lubrication there.
Ein weiterer wesentlicher Vorteil der vorliegenden Erfindung ist es, dass sich nach der Einbringung von Druckluft in den Eingang des Schmiermittelkanals keine Schmiermittelreste mehr im Schmiermittelkanal befinden. Es wurde im Rahmen der Erfindung erkannt, dass die im Schmiermittelkanal verbleibenden Schmiermittelreste bei aus dem Stand der Technik bekannten Druckgussvorrichtungen zu Problemen führen können. Dies gilt insbesondere dann, wenn zur Verbesserung der Gussteilqualität in der Gießkammer und/oder in dem damit verbundenen Formhohlraum vor dem Einschießen der Schmelze ein Vakuum erzeugt wird. In diesem Fall können nämlich bei aus dem Stand der Technik bekannten Druckgussvorrichtungen Schmiermittelreste, welche sich im Schmiermittelkanal befinden, bei der Erzeugung des Vakuums in die Gießkammer gesogen werden, so dass eine größere Menge Schmiermittel unerwünschter Weise mit der Schmelze in Kontakt kommt. Dies kann zu deutlichen Beeinträchtigungen der Gussteilqualität führen. Insbesondere kann es zu chemischen Reaktionen des Schmiermittels mit der heißen Schmelze kommen, so dass beispielsweise Wasserstoffgas entsteht, welches während des Einschießens im Gussteil eingeschlossen wird. Die erfindungsgemäße Druckgussvorrichtung erlaubt hingegen ein nahezu vollständiges Freiblasen des Schmiermittelkanals, so dass es bei einer nachfolgenden Vakuumerzeugung nicht zu einem unerwünschten Einsaugen von Schmiermittel kommt.Another significant advantage of the present invention is that after the introduction of compressed air into the inlet of the lubricant channel no lubricant residues are more in the lubricant channel. It has been recognized within the scope of the invention that the lubricant residues remaining in the lubricant channel can lead to problems with die-cast devices known from the prior art. This is especially true when a vacuum is generated to improve the casting quality in the casting chamber and / or in the associated mold cavity prior to the injection of the melt. In this case, namely in known from the prior art die casting devices lubricant residues, which are in the lubricant passage, are sucked in the generation of the vacuum in the casting chamber, so that a larger amount of lubricant undesirably comes into contact with the melt. This can lead to significant impairments of the casting quality. In particular, there may be chemical reactions of the lubricant with the hot melt, so that, for example, hydrogen gas is formed, which is trapped during the shooting in the casting. By contrast, the die-casting device according to the invention allows an almost complete blowing out of the lubricant channel, so that there is no undesired sucking in of lubricant in a subsequent vacuum generation.
Der Gießkolben kann in vorteilhaften Ausführungsformen einen Durchmesser zwischen 2 cm und 16 cm, bevorzugt zwischen 3,5 cm und 14 cm, weiter bevorzugt zwischen 5 cm und 12 cm aufweisen. Der Schmiermittelkanal kann einen Durchmesser zwischen 2 mm und 15 mm, vorzugsweise zwischen 4 mm und 12 mm, weiter vorzugsweise zwischen 6 mm und 10 mm aufweisen.In advantageous embodiments, the casting piston may have a diameter between 2 cm and 16 cm, preferably between 3.5 cm and 14 cm, more preferably between 5 cm and 12 cm. The lubricant channel may have a diameter between 2 mm and 15 mm, preferably between 4 mm and 12 mm, more preferably between 6 mm and 10 mm.
In einer vorteilhaften Ausführungsform erstreckt sich der Schmiermittelkanal durch den Gießkolben. Die Schmierung des Gießkolbens mit Hilfe eines durch den Gießkolben selbst verlaufenden Schmiermittelkanals ist von Vorteil, da das Schmiermittel und die Druckluft in diesem Fall während einer Bewegung des Gießkolbens innerhalb der Gießkammer ausgebracht werden können, so dass das Schmiermittel innerhalb der Gießkammer verteilt wird.In an advantageous embodiment, the lubricant channel extends through the casting piston. The lubrication of the casting piston by means of a lubricant channel running through the casting piston itself is advantageous, since the lubricant and the compressed air in this case can be applied during a movement of the casting piston within the casting chamber, so that the lubricant is distributed within the casting chamber.
Bevorzugt ist zudem der Ausgang des Schmiermittelkanals in der Mantelfläche des Gießkolbens angeordnet. Das Schmiermittel kann in diesem Fall im Bereich der Mantelfläche ausgebracht werden und dort unmittelbar eine Gleitschicht bilden.In addition, the outlet of the lubricant channel is preferably arranged in the lateral surface of the casting piston. The lubricant can be applied in this case in the region of the lateral surface and form there directly a sliding layer.
Der Gießkolben kann zudem eine um seine Mantelfläche umlaufende Ringnut aufweisen, wobei der Ausgang des Schmiermittelkanals in die Ringnut mündet. Das durch die Druckluft ausgebrachte Schmiermittel kann sich so um den Gießkolben herum bewegen, was die Verteilung des Schmiermittels innerhalb der Gießkammer weiter verbessert.The casting piston can also have a circumferential groove around its circumferential surface, wherein the outlet of the lubricant channel opens into the annular groove. The lubricant discharged by the compressed air can thus move around the casting piston, which further improves the distribution of the lubricant within the casting chamber.
Bevorzugt umfasst die erfindungsgemäße Druckgussvorrichtung eine mit dem Gießkolben verbundene Kolbenstange, wobei sich der Schmiermittelkanal durch die Kolbenstange erstreckt. Die Kolbenstange ist bevorzugt fest mit dem Gießkolben verbunden. Sie dient dazu, den Kolben innerhalb der Gießkammer zu verschieben. Die Kolbenstange verläuft üblicherweise durch eine Kolbenstangenöffnung in der Gießkammer.Preferably, the die-casting device according to the invention comprises a piston rod connected to the casting piston, wherein the lubricant channel extends through the piston rod. The piston rod is preferably fixedly connected to the casting piston. It serves to move the piston within the casting chamber. The piston rod usually passes through a piston rod opening in the casting chamber.
In einer vorteilhaften Ausführungsform ist die Drucklufteinrichtung über ein erstes Ventil mit dem Schmiermittelkanal verbunden. Von Vorteil ist es zudem, wenn die Schmiermitteleinrichtung über ein zweites Ventil mit dem Schmiermittelkanal verbunden ist. Die Verwendung von Ventilen erlaubt es, das Schmiermittel und die Druckluft getrennt voneinander in den in den Schmiermittelkanal einzubringen, ohne dass Schmiermitteleinrichtung und Drucklufteinrichtung sich gegenseitig beeinflussen. Insbesondere kann vermieden werden, dass das Schmiermittel durch die Druckluft zurück in die Schmiermitteleinrichtung gedrückt wird.In an advantageous embodiment, the compressed air device is connected via a first valve with the lubricant channel. It is also advantageous if the lubricant device is connected via a second valve with the lubricant channel. The use of valves allows the lubricant and the compressed air to be introduced into the lubricant channel separately from one another without the lubricant device and the pneumatic device influencing each other. In particular, it can be avoided that the lubricant is forced back into the lubricant device by the compressed air.
In einer bevorzugten Ausführungsform weist die Druckgussvorrichtung eine Vakuumvorrichtung auf, welche zur Evakuierung der Gießkammer und/oder des Formhohlraums ausgebildet ist. Wie oben bereits erläutert kommen die erfindungsgemäßen Vorteile besonders zum Tragen, wenn eine solche Vakuumvorrichtung vorhanden ist. Mit Hilfe der Vakuumvorrichtung kann, beispielsweise nach dem Einfüllen der Schmelze, ein Vakuum innerhalb der Gießkammer und innerhalb des Formhohlraums erzeugt werden. Es befinden sich dann in der Gießkammer keine Gase mehr, welche beim nachfolgenden Einschießen der Schmelze in den Formhohlraum gedrückt und innerhalb des Gussteils eingeschlossen werden könnten. Die Gussteilqualität wird dadurch deutlich erhöht. Aufgrund der erfindungsgemäßen Drucklufteinrichtung kann vor Erzeugung des Vakuums sichergestellt werden, dass der Schmiermittelkanal frei von Schmiermittelresten ist. Es werden dann während Erzeugung des Vakuums keine Schmiermittelreste in die Gießkammer eingezogen. Die Gussteilqualität kann auf diese Weise weiter gesteigert werden.In a preferred embodiment, the die casting device has a vacuum device, which is designed for evacuation of the casting chamber and / or the mold cavity. As already explained above, the advantages according to the invention come into play especially when such a vacuum device is present is. With the help of the vacuum device, for example, after filling the melt, a vacuum can be generated within the casting chamber and within the mold cavity. There are then no more gases in the casting chamber, which could be pressed in the subsequent injection of the melt in the mold cavity and enclosed within the casting. The casting quality is thereby increased significantly. Due to the compressed air device according to the invention can be ensured before generating the vacuum that the lubricant channel is free of lubricant residues. It will then retracted during generation of the vacuum no lubricant residues in the casting chamber. The casting quality can be further increased in this way.
Vorzugsweise umfasst die Druckgussvorrichtung eine Abdeckung, welche zum vakuumdichten Abschließen der Einfüllöffnung ausgebildet ist. Bevorzugt weist die Abdeckung eine Zuleitung zur Vakuumvorrichtung auf. Über die Zuleitung kann, wenn die Abdeckung die Einfüllöffnung abschließt, ein Vakuum im Inneren der Gießkammer erzeugt werden. Die Zuleitung kann einen großen Querschnitt aufweisen, beispielsweise kann der Querschnitt der Zuleitung zwischen 20 mm und 40 mm liegen, so dass die Gießkammer über die Zuleitung und die Einfüllöffnung unter Verwendung eines großen Volumenstroms evakuiert werden kann. Werden zur Evakuierung große Volumenströme verwendet, ist es aufgrund des damit einhergehenden starken "Saugeffektes" besonders wichtig, dass sich keine Schmiermittelreste im Schmiermittelkanal befinden.Preferably, the die casting device comprises a cover, which is designed for vacuum-tight closing of the filling opening. The cover preferably has a supply line to the vacuum device. Via the supply line, when the cover closes the filling opening, a vacuum can be generated in the interior of the casting chamber. The feed line can have a large cross section, for example, the cross section of the feed line can be between 20 mm and 40 mm, so that the pouring chamber can be evacuated via the feed line and the filling opening using a large volume flow. If large volume flows are used for evacuation, it is particularly important that there are no lubricant residues in the lubricant channel due to the associated strong "suction effect".
Die Abdeckung kann in einer bevorzugten Ausführungsform einen vakuumdichten Innenraum zwischen sich und der Gießkammer definieren, wobei sich bevorzugt ein an die Gießkammer angrenzender Bereich der Kolbenstange im Innenraum befindet. Die Abdeckung kann dazu eine Durchführungsdichtung für die Kolbenstange aufweisen. Die Abdeckung kann verschiebbar ausgebildet sein, wobei ein vakuumdichter Abschluss der Einfüllöffnung durch eine Verschiebung der Abdeckung erreicht wird. Wenn sich die Kolbenstange in dem an die Gießkammer angrenzenden Bereich im evakuierten Innenraum der Abdeckung befindet, wird vermieden, dass beim Evakuieren der Gießkammer über den zwangsläufig vorhandenen Spalt zwischen der Kolbenstangenöffnung und der Kolbenstange Außenluft in die Gießkammer gesogen wird.In a preferred embodiment, the cover may define a vacuum-tight interior space between it and the casting chamber, with an area of the piston rod adjacent to the casting chamber preferably being located in the interior. The cover may have a grommet for the piston rod. The cover may be designed to be displaceable, wherein a vacuum-tight closure of the filling opening is achieved by a displacement of the cover. When the piston rod is in the evacuated interior of the cover in the area adjacent to the casting chamber, it is avoided that outside air is sucked into the casting chamber when evacuating the casting chamber via the necessarily existing gap between the piston rod opening and the piston rod.
Beim Einschießen der Schmelze aus der Gießkammer in den Formhohlraum kommt es an einer Frontfläche des Gießkolbens zu einem Kontakt mit der Schmelze und zu einer damit verbundenen Wärmeübertragung von der Schmelze auf den Gießkolben. Das in unmittelbarer Nähe des Gießkolbens befindliche Metall gibt daher Wärme an den Gießkolben ab und kann unter Umständen vorzeitig erkalten. Wird dieses vorzeitig erkaltete Material in den Formhohlraum eingebracht, können im Werkstück Bereiche mit verminderter Materialqualität entstehen.Upon injection of the melt from the casting chamber into the mold cavity, contact takes place with the melt on a front surface of the casting piston and heat transfer from the melt to the casting piston occurs. The metal located in the immediate vicinity of the casting piston therefore gives off heat to the casting piston and under certain circumstances may prematurely cool. If this prematurely cooled material is introduced into the mold cavity, areas with reduced material quality can arise in the workpiece.
In einer vorteilhaften Ausführungsform weist die Gießkammer deshalb eine an den Formhohlraum angrenzende Rückwand mit einem zum Formhohlraum führenden Durchgang für das Gussmaterial auf, wobei der Gießkolben zum Einschießen des Gussmaterials bis in eine Endposition verschiebbar ist, wobei in der Endposition des Gießkolbens zwischen dem Gießkolben und der Rückwand ein Freiraum besteht. In den Freiraum kann beim Einschießen der Schmelze flüssiges Metall eintreten, welches dort möglicherweise vorzeitig erkaltet, jedoch aufgrund des Freiraums auch in der Endposition des Gießkolbens (also in einer Position, in der der Gießkolben dem Formhohlraum am nächsten steht) nicht in den Formhohlraum befördert wird. Die Einbringung vorzeitig erkalteten Gussmaterials in den Formhohlraum wird so vermieden oder zumindest verringert.In an advantageous embodiment, the casting chamber therefore has an adjacent to the mold cavity rear wall with a passage leading to the mold cavity for the casting material, wherein the casting piston for shooting the casting material is displaceable up to an end position, wherein in the end position of the casting piston between the casting piston and the Back wall a clearance exists. Liquid metal can enter the free space when the melt is melted in, which possibly cools prematurely there, but is not conveyed into the mold cavity due to the free space in the end position of the casting piston (ie in a position in which the casting piston is closest to the mold cavity) , The introduction prematurely cooled casting material in the mold cavity is thus avoided or at least reduced.
Der Freiraum kann ein Volumen zwischen 10 und 160 cm3, bevorzugt zwischen 30 und 120 cm3, weiter bevorzugt zwischen 50 und 90 cm3 einnehmen. Bevorzugt ist der Freiraum in einem Bereich der Gießkammer angeordnet, welcher sich vom Boden der Gießkammer bis zu einer Höhe von weniger als 80% der Gießkammer, bevorzugt bis zu einer Höhe von weniger als 70%, weiter bevorzugt von weniger als 60% erstreckt. Dies ist vorteilhaft, da die Gießkammer üblicherweise nur bis zu einer bestimmten Höhe mit dem Gussmaterial gefüllt wird, so dass die Metallschmelze nach dem Einfüllen im unteren Bereich der Gießkammer mit dem Gießkolben in Berührung kommt.The free space may occupy a volume between 10 and 160 cm 3 , preferably between 30 and 120 cm 3 , more preferably between 50 and 90 cm 3 . The clearance is preferably arranged in a region of the casting chamber which extends from the bottom of the casting chamber to a height of less than 80% of the casting chamber, preferably to a height of less than 70%, more preferably of less than 60%. This is advantageous, since the casting chamber is usually filled with the casting material only up to a certain height, so that the molten metal comes into contact with the casting piston after filling in the lower region of the casting chamber.
Bevorzugt wird der Freiraum durch eine Aussparung im Gießkolben gebildet. Die Aussparung kann durch einen schrägen Anschnitt einer Frontfläche des Gießkolbens gebildet werden. Die Frontfläche bezeichnet dabei die in Richtung des Formhohlraums weisende Fläche des Gießkolbens.Preferably, the free space is formed by a recess in the casting piston. The recess can be formed by an oblique section of a front surface of the casting piston. The front surface refers to the facing in the direction of the mold cavity surface of the casting piston.
Der erfindungsgemäße Freiraum kann einen eigenständigen erfinderischen Gehalt aufweisen. Eine oben beschriebene Vorrichtung zum Druckgießen eines Gussmaterials, welche den oben genannten Freiraum aufweist, kann somit unabhängig von Schmiermittelkanal, Schmiermitteleinrichtung und Drucklufteinrichtung ein Gegenstand der vorliegenden Erfindung sein.The free space according to the invention may have an independent inventive content. An above-described device for die-casting a casting material which has the above-mentioned free space can thus be an object of the present invention independently of the lubricant channel, lubricant device and compressed-air device.
Gegenstand der Erfindung ist weiterhin ein Verfahren zum Schmieren eines Gießkolbens, welcher innerhalb einer Gießkammer einer Druckgussvorrichtung geführt ist, wobei die Druckgussvorrichtung einen in die Gießkammer mündenden Schmiermittelkanal aufweist, umfassend die nachfolgenden Schritte:
- a. Einbringen von Schmiermittel in einen Eingang des Schmiermittelkanals;
- b. Einbringen von Druckluft in den Eingang des Schmiermittelkanals.
- a. Introducing lubricant into an inlet of the lubricant channel;
- b. Introducing compressed air into the inlet of the lubricant channel.
In einer bevorzugten Ausführungsform wird in Schritt a. eine Schmiermittelmenge zwischen 0,1 ml und 1,4 ml, bevorzugt zwischen 0,2 ml und 1 ml, weiter bevorzugt zwischen 0,4 ml und 0,6 ml in den Schmiermittelkanal eingebracht.In a preferred embodiment, in step a. a quantity of lubricant between 0.1 ml and 1.4 ml, preferably between 0.2 ml and 1 ml, more preferably between 0.4 ml and 0.6 ml introduced into the lubricant channel.
Bevorzugt wird Druckluft in Schritt b. mit einem Druck im Bereich zwischen 4 bar und 10 bar, bevorzugt zwischen 6 bar und 8 bar in den Schmiermittelkanal eingebracht.Preference is given to compressed air in step b. with a pressure in the range between 4 bar and 10 bar, preferably introduced between 6 bar and 8 bar in the lubricant channel.
Vorzugsweise wird die Druckluft in Schritt b. über einen Zeitraum zwischen 0,5 und 5 Sekunden, bevorzugt zwischen 2 und 3 Sekunden in den Eingang des Schmiermittelkanals eingebracht.Preferably, the compressed air in step b. over a period of between 0.5 and 5 seconds, preferably between 2 and 3 seconds introduced into the entrance of the lubricant channel.
In einer vorteilhaften Ausführungsform wird das Schmiermittel und / oder die Druckluft beim Zurückziehen des Gießkolbens eingebracht. Insbesondere kann vorgesehen sein, dass das Schmiermittel und / oder die Druckluft nach dem Einschießen der Schmelze in den Schmiermittelkanal eingebracht wird. Unmittelbar nach dem Einschießen Schmelze befindet sich der Gießkolben in der Nähe der Endposition (also in einer an den Formhohlraum angrenzenden Position). Wenn der Vorgang des Schmierens beim Zurückziehen aus der Endposition durchgeführt wird, kann das Schmiermittel über den Schmiermittelkanal im gesamten Gießkolben verteilt werden.In an advantageous embodiment, the lubricant and / or the compressed air is introduced during retraction of the casting piston. In particular, it may be provided that the lubricant and / or the compressed air is introduced into the lubricant channel after the melt has been injected. Immediately after pouring melt, the casting piston is near the end position (ie in a position adjacent to the mold cavity). When the lubricating operation is performed upon retraction from the end position, the lubricant may be distributed across the lubricant passage throughout the casting piston.
In einer bevorzugten Ausführungsform wird nach den oben genannten Verfahrensschritten a. und b. ein Vakuum im Innenraum der Gießkammer erzeugt.In a preferred embodiment, after the above-mentioned process steps a. and b. generates a vacuum in the interior of the casting chamber.
Nachfolgend wird eine bevorzugte Ausführungsform der Erfindung unter Bezugnahme auf die beigefügten Zeichnungen beispielhaft erläutert.Hereinafter, a preferred embodiment of the invention will be described by way of example with reference to the accompanying drawings.
Es zeigen:
- Figur 1:
- eine schematische Illustration einer erfindungsgemäßen Druckgussvorrichtung nach dem Einfüllen eines Gussmaterials;
- Figur 2:
- die Druckgussvorrichtung der
Figur 1 nach dem Schließen einer Abdeckung; - Figur 3:
- die Druckgussvorrichtung der
Figur 1 nach dem Einschießen der Schmelze; - Figur 4:
- die Druckgussvorrichtung der
Figur 1 nach dem Einbringen von Schmiermittel in einen Schmiermittelkanal; - Figur 5:
- die Druckgussvorrichtung der
Figur 1 beim Zurückziehen des Gießkolbens.
- FIG. 1:
- a schematic illustration of a die-casting device according to the invention after filling a casting material;
- FIG. 2:
- the die casting device of
FIG. 1 after closing a cover; - FIG. 3:
- the die casting device of
FIG. 1 after injection of the melt; - FIG. 4:
- the die casting device of
FIG. 1 after introducing lubricant into a lubricant channel; - FIG. 5:
- the die casting device of
FIG. 1 when retracting the casting piston.
Der Innenraum der Gießkammer 13 ist über den Durchgang 52 mit einem Formhohlraum 18 verbunden, welcher aus zwei Formteilhälften 19, 20 besteht. In die Gießkammer ist eine Metallschmelze 15 eingefüllt. Der Gießkolben 16 kann aus einer in
Der Gießkolben 16 weist eine Aussparung 43 auf, welche durch einen schrägen Anschnitt einer Frontfläche 42 des Gießkolbens 16 gebildet ist. Nach dem Einfüllen der Schmelze 15 in die Gießkammer 13 tritt die Schmelze 15 mit dem Gießkolben 16 in Kontakt. In der Nähe des Gießkolbens kann es zu einem frühzeitigen Abkühlen der Schmelze 15 kommen. Zum Einschießen der Schmelze 15 wird der Gießkolben 16 in die in
Die Mantelfläche des Gießkolbens 16 liegt möglichst eng an der Innenfläche 17 der Gießkammer 13 an, wobei jedoch ein Spalt 21 zwischen der Mantelfläche und der Innenfläche 17 besteht, um eine Bewegung des Gießkolbens 16 zu ermöglichen. Der Gießkolben 16 wird auf diese Weise innerhalb der Gießkammer 13 geführt. Ein Schmiermittelkanal 23 erstreckt sich sowohl durch die Kolbenstange 22, als auch durch den Gießkolben 16. Bezüglich der Darstellung von Gießkolben 16 und Kolbenstange 22 ist
Die Druckgussvorrichtung weist weiterhin eine Schmiermitteleinrichtung 28 auf, welche über ein Ventil 26 sowie eine Zuleitung 44 mit einem Eingang 25 des Schmiermittelkanals 23 verbunden ist. Die Schmiermitteleinrichtung 28 kann durch ein Schmiermittelreservoir und eine Schmiermittelpumpe gebildet sein. Zudem ist eine Drucklufteinrichtung 29 vorhanden, welche über ein Ventil 27 sowie eine Zuleitung 45 mit dem Eingang 25 verbunden ist. Die Drucklufteinrichtung 29 kann einen Druckluftbehälter umfassen und ist dazu ausgebildet über einen Zeitraum von mindestens 3 s Druckluft mit einem Druck von 7 bar bereitzustellen.The die-casting device further has a
Die Schmiermitteleinrichtung 28 ist dazu ausgebildet, eine genau dosierte Menge eines Schmiermittels über das Ventil 26 in den Eingang 25 des Schmiermittelkanals 23 einzubringen. Zudem ist die Drucklufteinrichtung 29 dazu ausgebildet, über das Ventil 27 Druckluft in den Eingang 25 des Schmiermittelkanals 23 einzubringen.The
Die Druckgussvorrichtung umfasst weiterhin eine Abdeckung 35, welche einen Innenraum 36 zwischen der Abdeckung 35 und der Gießkammer 13 definiert und welche in Längsrichtung der Gießkammer 13 verschiebbar ist. Durch eine Verschiebung der Abdeckung 35 in Richtung des Formhohlraums 18 kann die Einfüllöffnung 14 vakuumdicht verschlossen werden (siehe
Die Abdeckung 35 weist weiterhin einen Anschluss 39 auf, welcher über eine Leitung 40 und ein Ventil 41 mit einer Vakuumeinrichtung 30 verbunden ist. Die Vakuumeinrichtung 30 ist zudem über eine Zuleitung 31 und ein Ventil 32 mit dem Formhohlraum 18 verbunden.The
Der Ablauf eines erfindungsgemäßen Verfahrens ist in der Abfolge der
Wie oben bereits erläutert zeigt
Nach dem Einfüllen der Schmelze wird zunächst die Abdeckung 35 über die Einfüllöffnung 14 verschoben, so dass der Innenraum 36 sowie die Gießkammer 13 vakuumdicht verschlossen sind. Dieser Zustand ist in
Nachdem ein ausreichendes Vakuum innerhalb des Innenraums 36 sowie innerhalb der Gießkammer 13 erreicht wurde, wird der Gießkolben 16 in Richtung des Formhohlraums 18 verschoben, um die Schmelze 15 in den Formhohlraum 18 einzuschießen. Wenn der Gießkolben 16 die Einfüllöffnung 14 überfahren hat, kann auch das Ventil 32 geöffnet werden.
Anschließend wird, wie in
Anschließend wird, wie in
Nach dem Zurückziehen des Gießkolbens 16 hat dieser wieder die in
Claims (15)
Priority Applications (3)
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EP17188556.9A EP3450049B1 (en) | 2017-08-30 | 2017-08-30 | Pressure die casting device and method for lubricating a plunger |
HUE17188556A HUE051483T2 (en) | 2017-08-30 | 2017-08-30 | Pressure die casting device and method for lubricating a plunger |
PL17188556T PL3450049T3 (en) | 2017-08-30 | 2017-08-30 | Pressure die casting device and method for lubricating a plunger |
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EP17188556.9A EP3450049B1 (en) | 2017-08-30 | 2017-08-30 | Pressure die casting device and method for lubricating a plunger |
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EP3450049B1 EP3450049B1 (en) | 2020-05-27 |
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EP (1) | EP3450049B1 (en) |
HU (1) | HUE051483T2 (en) |
PL (1) | PL3450049T3 (en) |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3779305A (en) * | 1971-12-30 | 1973-12-18 | Heich Die Casting Corp | Apparatus for lubricating a die structure employed in die casting operations |
JPS5010728A (en) * | 1973-06-05 | 1975-02-04 | ||
US20090050289A1 (en) * | 2004-11-27 | 2009-02-26 | Pfeiffer Vacuum Gmbh | Vaccuum Die-Casting Method |
EP2745956A2 (en) * | 2012-12-21 | 2014-06-25 | Wieland-Werke AG | Die-casting device, lubrication supply system and lubrication method |
WO2015040490A2 (en) * | 2013-09-19 | 2015-03-26 | Magna International Inc. | High-pressure die casting apparatus and method |
-
2017
- 2017-08-30 HU HUE17188556A patent/HUE051483T2/en unknown
- 2017-08-30 EP EP17188556.9A patent/EP3450049B1/en active Active
- 2017-08-30 PL PL17188556T patent/PL3450049T3/en unknown
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3779305A (en) * | 1971-12-30 | 1973-12-18 | Heich Die Casting Corp | Apparatus for lubricating a die structure employed in die casting operations |
JPS5010728A (en) * | 1973-06-05 | 1975-02-04 | ||
US20090050289A1 (en) * | 2004-11-27 | 2009-02-26 | Pfeiffer Vacuum Gmbh | Vaccuum Die-Casting Method |
EP2745956A2 (en) * | 2012-12-21 | 2014-06-25 | Wieland-Werke AG | Die-casting device, lubrication supply system and lubrication method |
WO2015040490A2 (en) * | 2013-09-19 | 2015-03-26 | Magna International Inc. | High-pressure die casting apparatus and method |
Also Published As
Publication number | Publication date |
---|---|
PL3450049T3 (en) | 2020-11-02 |
HUE051483T2 (en) | 2021-03-01 |
EP3450049B1 (en) | 2020-05-27 |
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