EP1201334A1 - Procédé de fonctionnement d'une machine à couler sous pression à chambre chaude et machine correspondante - Google Patents
Procédé de fonctionnement d'une machine à couler sous pression à chambre chaude et machine correspondante Download PDFInfo
- Publication number
- EP1201334A1 EP1201334A1 EP00123326A EP00123326A EP1201334A1 EP 1201334 A1 EP1201334 A1 EP 1201334A1 EP 00123326 A EP00123326 A EP 00123326A EP 00123326 A EP00123326 A EP 00123326A EP 1201334 A1 EP1201334 A1 EP 1201334A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- casting
- pressure
- hot chamber
- die casting
- drive
- 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
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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
- B22D17/02—Hot chamber machines, i.e. with heated press chamber in which metal is melted
- B22D17/04—Plunger machines
Definitions
- the invention relates to a method for operating a hot chamber die casting machine with the metal melting from the casting tank via a riser hole, a mouthpiece and a connection is pressed into a mold.
- the invention relates also a hot chamber die casting machine using this method can be carried out.
- the liquid metal is passed through a Casting container and a plunger conveyed into the mold.
- the The casting container and the casting piston are constantly there in the metal bath.
- the piston movement and also at the end of the Piston movement occurs depending on the molten metal temperature Losses between piston rings and casting container bore.
- At the Warm chamber processes can therefore be used when casting zinc, which has a metal bath temperature of about 420 ° C, about 300bar metal pressure can be generated at the end of the filling process.
- die casting magnesium with a metal bath temperature of approx. 650 ° C only about 250bar metal pressure can also be used Be reached at the end of the filling process.
- cold chamber die casting processes (DE 29 22 914 C2), in which the mold filling phases take place in a similar manner, such as in the hot chamber die casting process.
- cold chamber processes in the case of the casting container and casting piston not in the liquid Located in the melt, it is possible to have higher final pressures of the order of 400 bar to 700 bar. This means, that because of the high metal pressure in the cold chamber process it is possible to manufacture parts with higher density. This in turn means less porosity in the die casting, higher strength and elongation values and higher surface density.
- the filling process takes Form about 7ms to 20ms.
- the maximum casting pressure acts on the already in the mold cavity through the connection metal.
- the thickness of the connection depends on the wall thickness and surface quality of the parts as well post-processing is and the thinnest wall thickness of the Connection is the thickness of the gate, the molten metal freeze first at this point. This will make the Connection from the mold cavity completed and that from the casting piston reprint can no longer or not more fully effective.
- the thinnest wall thickness of a gate e.g. with a zinc part 0.3mm to 0.6mm and with a magnesium part is 0.4mm to 0.8mm. By in this area Any cooling that occurs solidifies the material at this point quite fast.
- the present invention is based on the object to ensure a process of the type mentioned at the outset that despite the lower in the hot chamber die casting process Final pressures can be achieved by die casting have the same properties as those used in the cold chamber process have been produced.
- one of the methods described in the introduction mentioned type suggested that at the end of the mold filling process at least in the narrowest cross-section of the connection a pressure oscillation is generated, which the melt on prevents rapid freezing.
- a pressure oscillation is generated, which the melt on prevents rapid freezing.
- the timer can Pressure can be increased after a certain period of time, whereby the pulsation is maintained, so that when the Melt has reached the so-called semi-solid phase, which highest compression occurs. In this phase it forms no more burrs on the outer contours of the die-cast part.
- the pulsating pressure by superimposing the Drive generated with a vibration.
- This vibration can be approximately 300 Hz in a development of the invention and can with a predetermined deceleration of the plunger speed be initiated.
- the plunger speed can be determined in a known manner depending on the path, so that there is no problem in determining the time at which the pulsating pressure is required.
- the pressure compared to the maximum casting pressure can be pulsedly reduced or increased. whereby, as previously indicated, the pressure in the final phase decreased during a first short period of time and is increased during a second period of time before the complete Solidification of the melt occurs.
- the invention also relates to a hot chamber die casting machine, with which the new procedure can be carried out.
- This Hot chamber die casting machine has a casting piston drive and a control device therefor, the casting piston drive a switchable in the final phase of the filling process Is assigned to the pulsation device, whose vibrations the drive axis of the casting piston act.
- the casting piston drive with an electromotive driven plunger is provided, the pulsation device from the electrical Servo drive and from an acting on it Control device exist, this control device as one operated by a suitably designed software can be electronic calculator.
- the servo drive itself can be a brushless electric motor with low momentum his. Such a drive largely avoids the impact of inertial forces on the casting piston, but which in known manner by the interposition of a resilient Element between drive motor and casting piston or mitigated by controlled delimitation of the servo drive can be.
- Fig. 1 shows the press-in unit of a hot chamber die casting machine for processing metal melts, the rest arranged in a known manner in the melt bath Pouring container, one that can be moved in it via the press-in unit Pouring piston and with a riser hole and one the ends of which are provided with a mouthpiece.
- Mouthpiece fed the molten metal via a connection to the mold become.
- the threaded spindle 3 is sealed in a protective housing 5.
- Nut 4 out with a guide cam 6 in a groove 7th engages within the housing 5 and thereby in the housing 5 is guided non-rotatably.
- the mother 4 stands over the one free end of the spindle 3 overlapping extension 8 with a Push rod 9 in connection, which in turn seals led out of the housing 5 and with an extension 10 with smaller diameter is provided.
- a first disc 11 On the extension 10 is movably guided a first disc 11, which is connected to a pressure sensor 12 is present, for example in the manner of a piezoelectric Element can be executed.
- This pressure sensor 12 stands over a signal line 13 with a multi-parameter controller 20 in connection, via which the engine 1 in its Speed is regulated.
- a sleeve 14 with an end plate 15 slidably mounted, between the end plate 15 and the disk 11 bearing on the pressure sensor 12 a spring element in the form of a plastic ring 16 is arranged which is also penetrated by the extension 10.
- the sleeve 14 is at the end facing away from the disc 15 with a connection end 17 for connection to the not shown
- Provide casting piston with the free end of the extension 10 provided with a shoulder 18 of larger diameter is that holds the sleeve on the extension 10 and also for a certain Biasing of the plastic ring 16 can serve.
- This Paragraph 18 is the distance a from an inner end surface 19 of the sleeve 14 removed.
- This press-in unit is put into operation set when the molten metal in a known manner the crucible of a hot chamber die casting machine pressed into the mold shall be.
- the electric drive 1 is the Multi-parameter controller 20 stimulated to rotate the spindle 3, which causes the nut 4 from the shown Position runs down along the spindle 3 and while doing so the push rod 9 also presses down, with the speed required for filling the mold.
- the spindle When the mold is filled, the spindle must turn 3 switched from speed control to torque control become. To avoid the pouring plunger in in this case due to the mass moment of inertia of the drive to that in the mold presses incompressible melt and thereby undesirable Pressure peaks occur in the drive mechanism, leading to a
- the spring element 16 can cause damage provided that compresses and takes the path that otherwise the pouring plunger would have had to travel back.
- the arrangement is such that the drive distance traveled is smaller than dimension a.
- the spring element 16 therefore expresses itself slightly by an amount less than a together and is put under tension.
- the arrangement can be designed so that the spring element 16 exerted reaction force on the sleeve 14 and on the plunger is large enough to melt the required force due to a force, for example in the order of 7 to 8 tons (70 to 80 kilos N) to effect.
- Fig. 2 shows that to control the speed and the Torque of the electric motor 1, the controller 20, the target position 21 is specified for the casting piston, with the actual position 22 is compared, which at the output of the drive is removed.
- the controller 20 is also supplied with the Target speed and the target torque.
- the resulting one Target speed 24 is a digital, not shown or analog speed and torque control for the motor 1 supplied and the actual speed 25 and the actual torque then leads in a known manner to the supply of Melting material (filling process), for example in the three known mold filling phases.
- an actual position is reached (22) in which the mold is filled is described in the above Switched to torque control and now here at the time when the ram speed is a predetermined Deceleration value has reached a torque Vibration superimposed.
- FIG. 3 shows how this press-in process takes place in detail.
- the mold filling time is plotted on the abscissa and both the piston speed v and the pressure p generated in the melt by the forward-moving casting piston are plotted on the ordinate.
- FIG. 3 shows that in a first period up to the time period identified by line 26, the filling phase initially takes place at three - or even more - different speeds, then between the time indicated by line 26 and the time indicated by line 27 there is a significant increase in the piston and filling speed. From the point in time on line 27, the mold is filled over the period of time t F. This filling process is therefore carried out at high speed, with the pressure p inevitably also increasing in order to rise again to the final pressure shortly before its final rise when the mold is full, when the piston speed v decreases again to zero.
- this measure leads to pressure fluctuations occurring during the time periods t 1 and t 2 in the connection between the mold cavity and the mouthpiece of the hot-chamber die casting machine, but also in the entire space occupied by the melt, when the mold is filled.
- the pressure increase occurring during the period t 2 can therefore still have an effect on the entire mold cavity and on the melt located there.
- the melt is in the so-called semi-solid phase and the invention makes it possible to achieve the highest compression here.
- the method according to the invention is based on an exemplary embodiment have been explained, in which the press-in unit over an electric servo motor is operated.
- a braking point to be specified at the end of the filling process. You can see the appearance Avoid pressure peaks that - like at the beginning mentioned - arise at the end of an unbraked filling process would. The filling speed is therefore before the end of the mold filling reduced, so with this measure parts without Burr can be produced.
- This braking point to which So there is a predetermined delay, can be the starting point be provided for the pressure vibrations.
- pouring plunger is very easy to implement because it is sufficient to have appropriate control software to be made available via an electronic computer, which then at the point in time explained with reference to FIG switching to torque control the desired Initiates vibrations.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
- Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
- Forging (AREA)
- Die Bonding (AREA)
Priority Applications (10)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ES00123326T ES2235736T3 (es) | 2000-10-27 | 2000-10-27 | Maquina para moldeo a presion con camara caliente y procedimiento de funcionamiento correspondiente. |
DE50009878T DE50009878D1 (de) | 2000-10-27 | 2000-10-27 | Warmkammerdruckgiessmaschine und Betriebsverfahren hierfür |
AT00123326T ATE291513T1 (de) | 2000-10-27 | 2000-10-27 | Warmkammerdruckgiessmaschine und betriebsverfahren hierfür |
EP00123326A EP1201334B1 (fr) | 2000-10-27 | 2000-10-27 | Machine à couler sous pression à chambre chaude et procédé de coulée correspondant |
JP2001296567A JP4246423B2 (ja) | 2000-10-27 | 2001-09-27 | ホットチャンバ加圧鋳造機械を駆動する方法とそのためのホットチャンバ加圧鋳造機械 |
CZ20013827A CZ302923B6 (cs) | 2000-10-27 | 2001-10-24 | Zarízení pro tlakové lití s teplou komorou a zpusob tlakového lití s tímto zarízením |
PL350379A PL199828B1 (pl) | 2000-10-27 | 2001-10-26 | Sposób eksploatacji gorącokomorowej ciśnieniowej maszyny odlewniczej i gorącokomorowa ciśnieniowa maszyna odlewnicza |
US09/984,128 US6793000B2 (en) | 2000-10-27 | 2001-10-29 | Hot chamber pressurized casting machine and process for operating same and making cast parts therewith |
HK02105476A HK1043757A1 (en) | 2000-10-27 | 2002-07-24 | Hot chamber die casting machine and method of operation therefor. |
JP2006297663A JP2007021585A (ja) | 2000-10-27 | 2006-11-01 | ホットチャンバ加圧鋳造機械を駆動する方法とそのためのホットチャンバ加圧鋳造機械 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP00123326A EP1201334B1 (fr) | 2000-10-27 | 2000-10-27 | Machine à couler sous pression à chambre chaude et procédé de coulée correspondant |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1201334A1 true EP1201334A1 (fr) | 2002-05-02 |
EP1201334B1 EP1201334B1 (fr) | 2005-03-23 |
Family
ID=8170210
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00123326A Expired - Lifetime EP1201334B1 (fr) | 2000-10-27 | 2000-10-27 | Machine à couler sous pression à chambre chaude et procédé de coulée correspondant |
Country Status (9)
Country | Link |
---|---|
US (1) | US6793000B2 (fr) |
EP (1) | EP1201334B1 (fr) |
JP (2) | JP4246423B2 (fr) |
AT (1) | ATE291513T1 (fr) |
CZ (1) | CZ302923B6 (fr) |
DE (1) | DE50009878D1 (fr) |
ES (1) | ES2235736T3 (fr) |
HK (1) | HK1043757A1 (fr) |
PL (1) | PL199828B1 (fr) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4624809B2 (ja) * | 2005-01-13 | 2011-02-02 | 東芝機械株式会社 | ダイカストマシン及びダイカスト方法 |
EP1854570A4 (fr) * | 2005-02-22 | 2012-03-28 | Hitachi Metals Ltd | Rotor de compresseur et procédé de fabrication idoine |
ITMI20120950A1 (it) * | 2012-06-01 | 2013-12-02 | Flavio Mancini | Metodo e impianto per ottenere getti pressofusi in leghe leggere con anime non metalliche |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2922914A1 (de) * | 1979-06-06 | 1980-12-11 | Oskar Frech Werkzeugbau Gmbh & | Verfahren und anordnung zum steuern des einpressvorganges bei kaltkammer- druckgussmaschinen |
US4743190A (en) * | 1985-10-24 | 1988-05-10 | Gebruder Buhler Ag | Injection unit for injection molding or die-casting |
US5560419A (en) * | 1993-12-10 | 1996-10-01 | Ube Industries, Ltd. | Pressure-casting method and apparatus |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60250866A (ja) * | 1984-05-25 | 1985-12-11 | Toshiba Mach Co Ltd | ダイカスト機 |
DE4310310A1 (de) * | 1993-03-30 | 1994-10-06 | Frech Oskar Gmbh & Co | Einpreßaggregat |
DE4419848C1 (de) * | 1994-06-07 | 1995-12-21 | Frech Oskar Gmbh & Co | Warmkammer-Druckgießmaschine |
JPH08318359A (ja) * | 1995-05-26 | 1996-12-03 | Ube Ind Ltd | 加圧鋳造方法および装置 |
-
2000
- 2000-10-27 EP EP00123326A patent/EP1201334B1/fr not_active Expired - Lifetime
- 2000-10-27 ES ES00123326T patent/ES2235736T3/es not_active Expired - Lifetime
- 2000-10-27 DE DE50009878T patent/DE50009878D1/de not_active Expired - Lifetime
- 2000-10-27 AT AT00123326T patent/ATE291513T1/de active
-
2001
- 2001-09-27 JP JP2001296567A patent/JP4246423B2/ja not_active Expired - Fee Related
- 2001-10-24 CZ CZ20013827A patent/CZ302923B6/cs not_active IP Right Cessation
- 2001-10-26 PL PL350379A patent/PL199828B1/pl not_active IP Right Cessation
- 2001-10-29 US US09/984,128 patent/US6793000B2/en not_active Expired - Fee Related
-
2002
- 2002-07-24 HK HK02105476A patent/HK1043757A1/xx not_active IP Right Cessation
-
2006
- 2006-11-01 JP JP2006297663A patent/JP2007021585A/ja not_active Withdrawn
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2922914A1 (de) * | 1979-06-06 | 1980-12-11 | Oskar Frech Werkzeugbau Gmbh & | Verfahren und anordnung zum steuern des einpressvorganges bei kaltkammer- druckgussmaschinen |
US4743190A (en) * | 1985-10-24 | 1988-05-10 | Gebruder Buhler Ag | Injection unit for injection molding or die-casting |
US5560419A (en) * | 1993-12-10 | 1996-10-01 | Ube Industries, Ltd. | Pressure-casting method and apparatus |
Also Published As
Publication number | Publication date |
---|---|
CZ20013827A3 (cs) | 2002-07-17 |
PL350379A1 (en) | 2002-05-06 |
DE50009878D1 (de) | 2005-04-28 |
US20020050331A1 (en) | 2002-05-02 |
CZ302923B6 (cs) | 2012-01-18 |
EP1201334B1 (fr) | 2005-03-23 |
US6793000B2 (en) | 2004-09-21 |
HK1043757A1 (en) | 2002-09-27 |
JP2002144001A (ja) | 2002-05-21 |
ATE291513T1 (de) | 2005-04-15 |
JP4246423B2 (ja) | 2009-04-02 |
ES2235736T3 (es) | 2005-07-16 |
PL199828B1 (pl) | 2008-11-28 |
JP2007021585A (ja) | 2007-02-01 |
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