EP1201334B1 - Warmkammerdruckgiessmaschine und Betriebsverfahren hierfür - Google Patents

Warmkammerdruckgiessmaschine und Betriebsverfahren hierfür Download PDF

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Publication number
EP1201334B1
EP1201334B1 EP00123326A EP00123326A EP1201334B1 EP 1201334 B1 EP1201334 B1 EP 1201334B1 EP 00123326 A EP00123326 A EP 00123326A EP 00123326 A EP00123326 A EP 00123326A EP 1201334 B1 EP1201334 B1 EP 1201334B1
Authority
EP
European Patent Office
Prior art keywords
casting
pressure
hot chamber
die casting
casting machine
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.)
Expired - Lifetime
Application number
EP00123326A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1201334A1 (de
Inventor
Roland Fink
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Oskar Frech GmbH and Co KG
Original Assignee
Oskar Frech GmbH and Co KG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Oskar Frech GmbH and Co KG filed Critical Oskar Frech GmbH and Co KG
Priority to AT00123326T priority Critical patent/ATE291513T1/de
Priority to DE50009878T priority patent/DE50009878D1/de
Priority to EP00123326A priority patent/EP1201334B1/de
Priority to ES00123326T priority patent/ES2235736T3/es
Priority to JP2001296567A priority patent/JP4246423B2/ja
Priority to CZ20013827A priority patent/CZ302923B6/cs
Priority to PL350379A priority patent/PL199828B1/pl
Priority to US09/984,128 priority patent/US6793000B2/en
Publication of EP1201334A1 publication Critical patent/EP1201334A1/de
Priority to HK02105476A priority patent/HK1043757A1/xx
Application granted granted Critical
Publication of EP1201334B1 publication Critical patent/EP1201334B1/de
Priority to JP2006297663A priority patent/JP2007021585A/ja
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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 hot chamber die casting machine according to the The preamble of claim 1 and a method of operating such Hot chamber die casting machine, at the molten metal from Casting container via a riser hole, a mouthpiece and a connection is pressed into a mold.
  • the liquid metal is passed through a casting container and a casting piston conveyed into the mold.
  • the casting container and the casting piston are constantly in the metal bath. While the piston movement and also at the end of the piston movement arise depending on metal melting temperature losses between piston rings and casting vessel drilling.
  • warm chamber method can therefore when casting zinc, which has a metal bath temperature of approx. 420 ° C, about 300bar metal pressure at the end of the filling process be generated.
  • die casting magnesium at a metal bath temperature from about 650 ° C can only about 250bar metal pressure also be reached at the end of the filling process.
  • Kaltshudruckg intelligent compiler (DE 29 22 914 C2), in which the mold filling phases proceed in a similar manner as in the hot chamber die casting process.
  • the cold chamber method in the casting container and casting irons are not in the liquid melt, It is possible to have higher end pressures of the order of 400bar To produce 700bar. This means that it is because of the high metal pressure in the cold chamber method is possible, parts with higher density manufacture. This in turn means less porosity in the die-cast part, higher strength and elongation values and higher surface density.
  • US 5,560,419 discloses a cold chamber die casting machine and an associated method of operation in which the two mold halves against each other even when the mold is closed are axially movable by the one mold half through an opening in the other mold half is performed.
  • Melt is in the closed Shape over an overhead opening through a central hole introduced through a mold half. After introducing the Melt is a hydraulic pressure piston, on which one of the two Mold halves is fixed, offset in oscillating axial movement to to exert on the melt a pressure oscillation.
  • the filling process takes the form about 7ms to 20ms.
  • the maximum casting pressure on acts over the Connection to the metal already in the mold cavity.
  • the Thickness of the connection depending on the wall thickness and the surface quality the parts as well as the post-processing is and the thinnest Wall thickness of the connection is the thickness of the gate, the molten metal first freeze at this point. This will make the connection completed by the mold cavity and the casting from her applied reprint can no longer, or not fully, to the effect come.
  • the thinnest Wall thickness of a gate e.g. with a zinc part 0.3mm up 0.6mm and with a magnesium part at 0.4mm to 0.8mm. By the cooling occurring in this area solidifies the material this place relatively fast.
  • the present invention is based on the object, in a method of the type mentioned above to ensure that despite the Hot chamber die casting process lower final pressures die castings can be achieved, which have the same properties as those which have been produced in the cold chamber process.
  • the invention proposes a hot chamber die casting machine with the features of claim 1 and an operating method for this purpose with the features of claim 5.
  • a pressure oscillation is generated, which prevents the melt from rapidly solidifying.
  • the pressure can be applied via a timer a certain period of time, while maintaining the pulsation remains so that when the melt is the so-called Semisolid phase has reached the highest compression occurs.
  • this Phase is formed on the outer contours of the diecast no burr more. Due to the vibrations that are initiated at a relatively high frequency can be, the pressure on the metal in the mold fully transmitted. This creates a kind of hammering on the filled mold, which leads to a final compression of the material.
  • the pulsating pressure by superimposing the drive with a vibration be generated.
  • This vibration can in the development of the invention can be about 300Hz and can at a given delay the casting piston speed are initiated.
  • the casting piston speed can be determined in a known way path-dependent, so it does not cause any problems to determine the time, too which requires the pulsating pressure.
  • the pressure compared to the maximum Casting pressure pulsating lowered or increased. being as before already indicated, the pressure in the final phase during a first short period of time and increased during a second period of time becomes, before the complete solidification of the melt occurs.
  • This hot chamber die casting machine has a casting piston drive and a control device for this, wherein the casting piston drive one in the final phase associated with the filling operation switchable pulsation device, whose vibrations act on the drive axle of the casting piston.
  • the casting piston drive with an electric motor driven Casting piston is provided, the pulsation device from the electrical Servo drive and from acting on this control device exist, this control device as one of a corresponding designed software operated electronic computer can be.
  • the servo drive itself can be a brushless electric motor be with low momentum. Such a drive avoids largely the effect of inertial forces on the casting piston, but in a known manner by the interposition of a resilient element between the drive motor and casting piston or be reduced by controlled delimitation of the servo drive can.
  • Fig. 1 shows the Einpressaggregat a hot chamber die casting machine for the processing of molten metals, incidentally arranged in a known manner with a melt bath Casting container, a movable in this via the Einpressaggregat Casting piston and with a riser hole and a whose ends arranged mouthpiece is provided.
  • a melt bath Casting container a melt bath Casting container
  • a movable in this via the Einpressaggregat Casting piston and with a riser hole and a whose ends arranged mouthpiece is provided.
  • an electric motor 1 For example, an asynchronous motor or another variant a servomotor with a gear not shown in detail and provided with a coupling part 2, which is a threaded spindle 3 to a rotary motion drives.
  • the threaded spindle 3 is guided sealed in a protective housing 5.
  • Mother 4 On her is cooperating with the thread of the spindle 3 Mother 4 out with a Leitnocken 6 in a groove. 7 engages within the housing 5 and thereby in the housing. 5 is guided non-rotatably.
  • the mother 4 is about a free end of the spindle 3 cross-extension 8 with a Push rod 9 in conjunction, which in turn sealed led out of the housing 5 and with an extension 10 with is provided with a smaller diameter.
  • a first disc 11 On the extension 10 is movably guided a first disc 11, which is connected to a pressure sensor 12 is applied, for example, in the manner of a piezoelectric Element can be executed.
  • This pressure sensor 12 is connected via a signal line 13 with a multi-parameter controller 20 in connection, about which the engine 1 in his Speed is regulated.
  • a sleeve 14 with an end plate 15 slidably mounted, wherein between the end plate 15 and the voltage applied to the pressure sensor 12 disc 11th a spring element in the form of a plastic ring 16 is arranged is, which is also penetrated by the extension 10.
  • the sleeve 14 is at the end facing away from the disc 15 with a terminal end 17 for connection to the not shown Provided casting piston, the free end of the extension 10 provided with a paragraph 18 of larger diameter is that holds the sleeve on the extension 10 and also for a certain Bias of the plastic ring 16 can serve.
  • This Paragraph 18 is about the distance a from an inner end surface 19 of the sleeve 14 removed.
  • This injection unit is in 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 doing over the Multi-parameter controller 20 is excited to a rotation of the spindle 3, which causes the mother 4 from the shown Position on the spindle 3 along down and running the push rod 9 also pushes down, with the speed necessary for the filling of the mold.
  • the arrangement is made such that the drive distance traveled is less than the measure a.
  • the spring element 16 is therefore expressed slightly by an amount less than a together and is put under tension.
  • the arrangement can be designed so that then the spring element 16 exerted reaction force on the sleeve 14 and on the casting piston is sufficiently large to melt in the the required emphasis due to a force, for example in the order of 7 to 8 tons (70 to 80 kilos N).
  • Fig. 2 shows that for controlling the speed and the Torque of the electric motor 1 to the controller 20, the target position 21 is given 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 fed to the Target speed and the target torque.
  • the resulting Target speed 24 is a not shown in detail digital or analog speed and torque control for supplied to the engine 1 and the actual speed 25 and the actual torque then leads in a known manner to the supply of Melting material (filling), for example in the three known mold filling phases.
  • an actual position (22) in which the mold is filled, in the previously explained Way switched to torque control and here now at the time when the casting piston speed is a predetermined Delay value has reached the torque one Vibration superimposed.
  • FIG. 3 shows how this press-fitting process is going on in detail.
  • the form filling time is plotted on the abscissa and on the ordinate both the piston speed v and the pressure generated in the melt by the forwardly moving casting piston p.
  • FIG. 3 shows that in a first time segment up to the period indicated by the line 26, the filling phase initially takes place with three or more different speeds, in which case between the time indicated by the line 26 and the time indicated by the line 27 a significant increase in the piston and filling speed takes place. From the time at line 27 from the filling of the mold takes place over the period t F. Therefore, this filling process is carried out at high speed, which inevitably also increases the pressure p to increase again shortly before its final increase in filled form when the piston speed v decreases again to zero, once again to the final pressure.
  • this measure leads to pressure fluctuations during the time intervals t 1 and t 2 occurring 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.
  • the pressure increase occurring during the period t 2 can therefore still affect the entire mold cavity and the melt located there.
  • the melt is in the so-called semisolid phase and it is possible by the invention to achieve the highest compression here. In this phase, there is no longer any burr in the shape of the outer contours of the die-cast part.
  • the inventive method is based on an embodiment been explained, in which the Einpressaggregat over an electric servomotor is operated.
  • a braking point at the end of the filling process. You can thereby the occurrence avoid pressure peaks, which - as well as the beginning mentioned - arise at the end of an unrestrained filling would.
  • the filling speed is thus before the end of the mold filling reduced, so with this measure parts without Burr can be produced.
  • This braking point to which So a predetermined delay is present, as a starting point be provided for the pressure oscillations.
  • casting plunger is very easy to realize, because it is sufficient to have appropriate software for the controller via an electronic computer, then at the time explained with reference to FIG switching to torque control the desired Vibrations initiates.

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)
EP00123326A 2000-10-27 2000-10-27 Warmkammerdruckgiessmaschine und Betriebsverfahren hierfür Expired - Lifetime EP1201334B1 (de)

Priority Applications (10)

Application Number Priority Date Filing Date Title
AT00123326T ATE291513T1 (de) 2000-10-27 2000-10-27 Warmkammerdruckgiessmaschine und betriebsverfahren hierfür
DE50009878T DE50009878D1 (de) 2000-10-27 2000-10-27 Warmkammerdruckgiessmaschine und Betriebsverfahren hierfür
EP00123326A EP1201334B1 (de) 2000-10-27 2000-10-27 Warmkammerdruckgiessmaschine und Betriebsverfahren hierfür
ES00123326T ES2235736T3 (es) 2000-10-27 2000-10-27 Maquina para moldeo a presion con camara caliente y procedimiento de funcionamiento correspondiente.
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 (de) 2000-10-27 2000-10-27 Warmkammerdruckgiessmaschine und Betriebsverfahren hierfür

Publications (2)

Publication Number Publication Date
EP1201334A1 EP1201334A1 (de) 2002-05-02
EP1201334B1 true EP1201334B1 (de) 2005-03-23

Family

ID=8170210

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00123326A Expired - Lifetime EP1201334B1 (de) 2000-10-27 2000-10-27 Warmkammerdruckgiessmaschine und Betriebsverfahren hierfür

Country Status (9)

Country Link
US (1) US6793000B2 (xx)
EP (1) EP1201334B1 (xx)
JP (2) JP4246423B2 (xx)
AT (1) ATE291513T1 (xx)
CZ (1) CZ302923B6 (xx)
DE (1) DE50009878D1 (xx)
ES (1) ES2235736T3 (xx)
HK (1) HK1043757A1 (xx)
PL (1) PL199828B1 (xx)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
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
JP4833961B2 (ja) * 2005-02-22 2011-12-07 株式会社日立メタルプレシジョン 過給機用羽根車およびその製造方法
ITMI20120950A1 (it) * 2012-06-01 2013-12-02 Flavio Mancini Metodo e impianto per ottenere getti pressofusi in leghe leggere con anime non metalliche

Family Cites Families (7)

* Cited by examiner, † Cited by third party
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
JPS60250866A (ja) * 1984-05-25 1985-12-11 Toshiba Mach Co Ltd ダイカスト機
CH668385A5 (de) * 1985-10-24 1988-12-30 Buehler Ag Geb Einspritzeinheit fuer eine giessmaschine.
DE4310310A1 (de) * 1993-03-30 1994-10-06 Frech Oskar Gmbh & Co Einpreßaggregat
JPH07164128A (ja) * 1993-12-10 1995-06-27 Ube Ind Ltd 加圧鋳造方法および装置
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

Also Published As

Publication number Publication date
JP2002144001A (ja) 2002-05-21
PL199828B1 (pl) 2008-11-28
JP4246423B2 (ja) 2009-04-02
ATE291513T1 (de) 2005-04-15
CZ302923B6 (cs) 2012-01-18
CZ20013827A3 (cs) 2002-07-17
HK1043757A1 (en) 2002-09-27
JP2007021585A (ja) 2007-02-01
EP1201334A1 (de) 2002-05-02
ES2235736T3 (es) 2005-07-16
US6793000B2 (en) 2004-09-21
PL350379A1 (en) 2002-05-06
DE50009878D1 (de) 2005-04-28
US20020050331A1 (en) 2002-05-02

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