EP0594679A1 - Process for producing castings using a die-casting machine. - Google Patents
Process for producing castings using a die-casting machine.Info
- Publication number
- EP0594679A1 EP0594679A1 EP92914598A EP92914598A EP0594679A1 EP 0594679 A1 EP0594679 A1 EP 0594679A1 EP 92914598 A EP92914598 A EP 92914598A EP 92914598 A EP92914598 A EP 92914598A EP 0594679 A1 EP0594679 A1 EP 0594679A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- filling
- filling chamber
- phase
- molten metal
- pressure
- 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
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
- B22D17/32—Controlling equipment
-
- 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
Definitions
- the invention relates to a method for producing castings by means of a die casting machine according to the further features according to the preamble of patent claim 1.
- the molten metal becomes one.
- the holding furnace is added in a metered amount to a filling chamber, from where it is "shot” into a mold cavity which determines the shape of the later casting by means of a casting piston.
- Die casting is a particularly economical process for the production of workpieces of complex shapes and generally allows a high production output, i. H. Casting application.
- gases and other impurities contained in the filling chamber or in the mold cavity are stored in the molten metal, for example aluminum, during the casting, so that porous and contaminated microstructure regions arise which adversely affect the casting quality as a whole and which Further processing (e.g. tempering) may even make it impossible.
- the molten metal can be introduced into the filling chamber by means of adjustable pressure differences between the latter and the holding furnace.
- the meltdown ze, when there is an overpressure in the holding furnace, pressed into the filling chamber, while it is drawn into the filling chamber via a suction tube as it were when a vacuum is applied (DE-OS 14 58 151).
- Claim 8 describes the structure of a hi e r die casting machine particularly suitable.
- the proposed casting quality can be achieved through the proposed pressure control in the hot-air furnace and / or in the filling chamber during the metering and filling phase.
- FIG. 1 shows a die casting machine with a horizontally directed filling chamber and metering of the metal melt by means of a filling chamber vacuum
- Fig. 2 shows the pressure distribution in the filling chamber during the
- Fig. 5 shows the pressure curve in the holding furnace and filling chamber during the metering and form filling phase
- Fig. 6 shows another way of printing in
- Holding oven and in the filling chamber 1 shows schematically a die casting machine 1 with two mold halves 2, 3, in the parting plane 4 of which a mold cavity 5 is incorporated.
- the molten metal 6 enters the mold cavity 5 from a holding furnace 7, in which it is kept at an adjustable temperature above the liquidus temperature, via a heatable suction pipe 8 and a horizontally arranged filling chamber 9.
- a movable means (not shown) (arrow 10 ) Piston rod 13 carries at the end a casting piston 14 which is guided in the filling chamber 9. This presses the molten metal 6 after its metered introduction into the filling chamber 9 into the mold cavity 5.
- an inert gas e.g. nitrogen, Ar ⁇ cn - filled tank volume 19
- connection 20 on the mold halves 2, 3 there is a further valve 21 via a feed line 22, which branches in the area of a four-way switching valve 23 (lines 22.1, 22.2), with pre-definable negative pressures (vacuum I, II) Tank containers 24.25 in connection.
- the four-way switching valve 23 also has a connection 26 opening into the surroundings (atmospheric pressure).
- the molten metal 6 is introduced into the filling chamber 9 in a metered manner by applying a relatively high negative pressure (vacuum I), which is approximately in the range from 30 to 50 mbar (absolute), the metering process being ended and opening at time A.
- the vacuum II (by actuating the four-way switching valve 23) is switched, which is reached approximately at time B.
- the plunger 14 is set in motion; this movement phase extends to time F, the remaining filling chamber volume is completely filled.
- the vacuum I is switched over again, which is reached at E and is also present in the mold cavity 5. A further flow of molten metal 6 out of the hot spot 7 cannot take place since the casting piston 14 has just passed over the suction pipe connection.
- FIG. 3 Another alternative of the pressure guide is shown in FIG. 3.
- the dosing as far as the size (orifice diameter; the metal melt filler opening is maintained, takes place over a longer period of time at a lower one, approximately in the range from 650 to 750 mbar (absolute, lying vacuum III Holding the metal melt level in the filling chamber 9 requires the required vacuum II (corresponding to the example according to FIG. 2), which is maintained at least until the pouring plunger 14 has initiated the filling chamber filling phase at time C and then passed the suction pipe connection. Repeat starting with D. the processes known from the example according to FIG. 2.
- the vacuum III can be achieved, for example, by switching on the very high vacuum I via the valve 21 connected to the mold pins 2, 3, while at the same time drying, cleaned air or an inert gas (e.g. Nitrogen, argon) is supplied. In this way, vacuum II according to FIGS. 2 and 3 could also be generated if necessary. The tank container 25 would then be unnecessary. Corresponding pressure variations are possible with the aid of the pressure control valve 18.
- an inert gas e.g. Nitrogen, argon
- the control of the casting piston movement can be accomplished, for example, in connection with pressure switches, pressure measuring devices or temperature sensors which are known in the prior art and are arranged in the filling chamber 9 or near the film cavity 5.
- the pressure control during the metering phase according to the example in FIG. 2 has the advantage that the filling chamber 9 and mold cavity 5 can be cleaned and degassed very quickly and, moreover, the metering process is completed relatively quickly. Any sealing problems that may occur are avoided with the pressure guide according to the example according to FIG. 3.
- Both versions have the common advantage that an inert gas purging of the filling chamber 9 and mold cavity 5 is possible in a particularly simple manner and that the wear of the filling chamber 9 and casting piston 14 can be kept low with a relatively quiet molten metal 6.
- the die casting machine 27 according to FIG. 4 has a certain degree of correspondence with that according to FIG. 1, so that elements of identical construction and function are provided with the same reference numerals.
- the main difference can be seen in the fact that the metering of the molten metal 6 does not take place by means of vacuum application to the filling chamber 9, but rather in that a closed holding furnace cavity 28 is supplied via a feed line 29 with interposed switching and pressure control valves 31, 30 is connected to the tank volume 19 and can therefore be placed under an adjustable excess pressure. This has the effect that the molten metal 6 rises in a dip tube 33 immersed in it and thus reaches the filling chamber 9 connected to it.
- FIGS. 5 and 6 The pressure control during the metering and mold filling process is shown in two exemplary embodiments in FIGS. 5 and 6.
- the times C and F indicated in these p / t diagrams again characterize, as a remedial measure the examples according to FIGS. 2 and 3, the respective beginning of the movement of the casting piston 14 in order to first fill the entire filling chamber volume with molten metal 6 (C) and to press the molten metal 6 into the mold cavity 5 in a "shot" in the subsequent mold filling phase (F).
- Points B, E and G each indicate the point in time at which a newly allocated pressure level is reached or the end of the form filling phase.
- an overpressure p 1 of about 0.4 bar above atmospheric pressure is set up to the end (A, the filling and metering phase in the hot-oven furnace cavity 28. If the desired filling level is reached, the pressure is reduced to a lower level Pressure level p 2 (approx. 0.15-0.25 bar above atmospheric pressure) is reduced, which is sufficient to maintain the liquid level of the molten metal 6.
- the filling chamber 9 itself is at atmospheric pressure IV (connection 26 of the four-way switch) - Ventiies 23)
- IV connection 26 of the four-way switch
- p a the pressure in the holding furnace cavity 28 is reduced to atmospheric pressure p a , while at the same time the high vacuum already known from the preceding examples is achieved by the corresponding position of the switching valve 23 in the mold cavity 5 and in the filling chamber 9 I is generated further flow of molten metal 6 from the holding furnace 34 cannot take place since the casting piston 14 has just passed over the intake manifold connection.
- the end of the filling and metering phase can be controlled in a known manner in terms of time or by means of a corresponding sensor (melt contact, thermocouple).
- the initiation of the piston movement of the casting piston 14 then takes place as a function of the time of the filling and metering phase or via pressure switches or pressure measuring devices which are also known in the prior art.
- the setting of the desired negative pressure in the filling chamber 9 or in the mold cavity 5 can in turn be achieved by an interaction between the negative pressure application via the valve 21 connected to the mold halves 2, 3 and by switching on dry air or inert gas from the tank chamber 19 via the nozzle 15 can be achieved.
Abstract
Selon un procédé de fabrication de pièces coulées à l'aide d'une machine à coulée sous pression (1), l'introduction dans une chambre de remplissage (9) du métal en fusion (6) contenu dans un réservoir (7) résulte d'une pression différentielle réglable entre les deux, le métal en fusion (6) étant pressé dans une cavité de moule (5) par un piston d'injection (14) situé du côté de la chambre de remplissage, après une phase de remplissage et de dosage. Afin d'améliorer la qualité des pièces coulées par rapport aux procédés connus, le procédé décrit se caractérise par les étapes suivantes: réduction de la pression différentielle, une fois la phase de remplissage et de dosage achevée, jusqu'à une valeur permettant de maintenir le niveau de remontée du métal en fusion dans la chambre de remplissage (9); le maintien de cette pression différentielle réduite (DELTAp) pendant une période prédéterminable du mouvement du piston d'injection, jusqu'à ce que le volume de la chambre de remplissage soit entièrement rempli; et l'augmentation ultérieure de la pression différentielle avant le début de la phase de remplissage des moules.According to a method of manufacturing cast parts using a pressure casting machine (1), the introduction into a filling chamber (9) of the molten metal (6) contained in a tank (7) results an adjustable differential pressure between the two, the molten metal (6) being pressed in a mold cavity (5) by an injection piston (14) located on the side of the filling chamber, after a filling phase and dosage. In order to improve the quality of the castings compared to known methods, the method described is characterized by the following steps: reduction of the differential pressure, once the filling and dosing phase is completed, up to a value making it possible to maintain the level of rise of the molten metal in the filling chamber (9); maintaining this reduced differential pressure (DELTAp) for a predetermined period of movement of the injection piston, until the volume of the filling chamber is completely filled; and the subsequent increase in the differential pressure before the start of the mold filling phase.
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4123463A DE4123463A1 (en) | 1991-07-16 | 1991-07-16 | METHOD FOR THE PRODUCTION OF CASTING PIECES BY MEANS OF A DIE CASTING MACHINE |
DE4123463 | 1991-07-16 | ||
PCT/EP1992/001572 WO1993001909A1 (en) | 1991-07-16 | 1992-07-11 | Process for producing castings using a die-casting machine |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0594679A1 true EP0594679A1 (en) | 1994-05-04 |
EP0594679B1 EP0594679B1 (en) | 1995-01-25 |
Family
ID=6436224
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP92914598A Expired - Lifetime EP0594679B1 (en) | 1991-07-16 | 1992-07-11 | Process for producing castings using a die-casting machine |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0594679B1 (en) |
JP (1) | JPH06509027A (en) |
DE (2) | DE4123463A1 (en) |
WO (1) | WO1993001909A1 (en) |
Families Citing this family (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4239558A1 (en) * | 1992-11-25 | 1994-05-26 | Mueller Weingarten Maschf | Process for producing negative pressure in a die casting machine |
JP2736491B2 (en) * | 1992-11-25 | 1998-04-02 | リョービ株式会社 | Method and apparatus for discharging gas in mold |
ES2127321T3 (en) * | 1993-10-16 | 1999-04-16 | Mueller Weingarten Maschf | AUTOMATIC INJECTION OR PRESSURE MOLDING MACHINE AND PROCEDURE FOR THE REGISTRATION OF THE FRONT OF THE MOLTEN MASS. |
DE4412867A1 (en) * | 1994-04-14 | 1995-10-19 | Alumetall Gmbh | Pressure diecasting process and appts. for same, |
DE4416205C1 (en) * | 1994-05-07 | 1995-12-07 | Alumetall Gmbh | Accurate dosing of die casting machine |
DE19628870A1 (en) * | 1996-07-17 | 1998-01-22 | Alusuisse Bayrisches Druckgus | Device and method for producing die-cast parts |
DE19645104B4 (en) * | 1996-10-31 | 2007-12-20 | Pfeiffer Vacuum Gmbh | Method for carrying out a process in a process space subjected to negative pressure |
DE19930624A1 (en) * | 1999-07-02 | 2001-01-11 | Geesthacht Gkss Forschung | Metal powder injection molding device used for molding metal or alloy powder, which may contain wax and/or polymer has its molding tool connected to vacuum pump |
DE19941430A1 (en) * | 1999-08-30 | 2001-03-01 | Mueller Weingarten Maschf | Process for regulating the metal dosing quantity |
DE19952116B4 (en) * | 1999-10-29 | 2006-09-28 | Audi Ag | Use of a metal die casting produced by vacuum casting |
DE102004057325A1 (en) * | 2004-11-27 | 2006-06-01 | Pfeiffer Vacuum Gmbh | Vacuum die casting process |
DE102007060418B4 (en) * | 2007-12-14 | 2010-11-11 | Martin Baumann | Method and apparatus for vacuum die casting for the production of low-pore and heat-treatable castings |
DE202010006752U1 (en) | 2010-05-12 | 2010-08-12 | Ge Com Garlin Engeneering & Composite Gmbh | Casting chamber seal in a die casting machine |
CH705077B1 (en) * | 2011-06-09 | 2016-01-29 | V D S Vacuum Diecasting Service S A | Valve device for evacuation of air from a mold. |
DE102012200568A1 (en) | 2012-01-16 | 2013-07-18 | Oskar Frech Gmbh + Co. Kg | Control device for casting piston feed movement |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB834723A (en) * | 1957-11-22 | 1960-05-11 | Sparklets Ltd | Apparatus for die casting and moulding |
US3009218A (en) * | 1958-10-22 | 1961-11-21 | David M Morgenstern | Apparatus for vacuum feeding a die casting machine |
US4050503A (en) * | 1973-08-16 | 1977-09-27 | Institute Po Metaloznanie I Technologia Na Metalite | Apparatus for controlling the rate of filling of casting molds |
DE3050628A1 (en) * | 1980-11-03 | 1988-02-25 | Mueller Weingarten Maschf | Vacuum pressure die casting of dense prods. - in machine where vacuum is applied to injector barrel and to die cavity to obtain castings with low contents of inclusions |
JPS58212857A (en) * | 1982-06-05 | 1983-12-10 | Fuji Electric Co Ltd | Automatic charging furnace |
DE3344537C1 (en) * | 1983-12-09 | 1985-06-05 | Daimler-Benz Ag, 7000 Stuttgart | Method of timed dosing of a liquid metal quantity in diecasting |
DE3611914A1 (en) * | 1986-04-09 | 1987-10-15 | Suntherm Gmbh | Dosing arrangement |
JPS63119966A (en) * | 1986-11-10 | 1988-05-24 | Toshiba Mach Co Ltd | Method for quick discharge of molten metal in molten metal supply system in pressurization type molten metal holding furnace |
-
1991
- 1991-07-16 DE DE4123463A patent/DE4123463A1/en not_active Withdrawn
-
1992
- 1992-07-11 DE DE59201305T patent/DE59201305D1/en not_active Expired - Fee Related
- 1992-07-11 WO PCT/EP1992/001572 patent/WO1993001909A1/en active IP Right Grant
- 1992-07-11 EP EP92914598A patent/EP0594679B1/en not_active Expired - Lifetime
- 1992-07-11 JP JP5502563A patent/JPH06509027A/en active Pending
Non-Patent Citations (1)
Title |
---|
See references of WO9301909A1 * |
Also Published As
Publication number | Publication date |
---|---|
JPH06509027A (en) | 1994-10-13 |
DE4123463A1 (en) | 1993-01-21 |
DE59201305D1 (en) | 1995-03-09 |
WO1993001909A1 (en) | 1993-02-04 |
EP0594679B1 (en) | 1995-01-25 |
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