EP0618025A1 - Unité pour enfoncer du métal liquide - Google Patents

Unité pour enfoncer du métal liquide Download PDF

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Publication number
EP0618025A1
EP0618025A1 EP94103175A EP94103175A EP0618025A1 EP 0618025 A1 EP0618025 A1 EP 0618025A1 EP 94103175 A EP94103175 A EP 94103175A EP 94103175 A EP94103175 A EP 94103175A EP 0618025 A1 EP0618025 A1 EP 0618025A1
Authority
EP
European Patent Office
Prior art keywords
press
spindle
casting
unit according
electric motor
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
Application number
EP94103175A
Other languages
German (de)
English (en)
Other versions
EP0618025B1 (fr
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
Publication of EP0618025A1 publication Critical patent/EP0618025A1/fr
Application granted granted Critical
Publication of EP0618025B1 publication Critical patent/EP0618025B1/fr
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
    • B22D17/2015—Means for forcing the molten metal into the die
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B1/00—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen
    • B30B1/18—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen by screw means
    • B30B1/181—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen by screw means the screw being directly driven by an electric motor

Definitions

  • the invention relates to a press-in unit for a die casting machine, with a casting piston for pressing casting material into the shape of the die casting machine.
  • Modern press-in units of die casting machines are designed as multi-phase press-in systems, especially three-phase systems.
  • a first, slow advance phase the casting piston is moved forward until the casting material is brought to the gate, while in a second phase it is pressed into the mold cavity of the closing part with a short filling time and high injection speed.
  • a third phase which is decisive for the quality of the cast products, the die casting is compressed under high pressures.
  • the casting piston is connected to a complex hydraulic system which comprises several pressure accumulators and control and regulating devices.
  • a press-in unit of this type is known from DE 29 22 914 C2.
  • This Binpreßaggregat three pressure accumulators are provided, which are connected to the casting piston cylinder via various lines provided with check, seat and control valves.
  • the pressure medium from the first pressure accumulator moves the casting piston from a rest position into one Position in which the casting material is at the gate, whereupon after reversing a seat valve, pressure medium from the second pressure accumulator is guided under high pressure and at high speed onto the casting piston, so that the casting material is quickly shot into the mold.
  • a further seat valve upstream of the third pressure accumulator is switched over, so that the pressure present in this third pressure accumulator can be passed on to a multiplier piston and from there using a transmission ratio to the casting piston.
  • the casting plunger in its end position thereby puts the casting material already shot into the mold under a very high pressure, as a result of which the quality casting is achieved.
  • the various pressure phases are controlled depending on the distance covered by the casting piston. The position of the piston rod of the casting piston must therefore be monitored by separate devices.
  • the invention is therefore based on the object of designing a press-in unit of the type mentioned at the outset in such a way that the use of a hydraulic fluid can be dispensed with, but without the prerequisites necessary for the die casting process being impaired.
  • At least one electric motor is provided as the drive for the casting piston.
  • an electric motor to drive the casting piston, the casting piston movement can be precisely controlled.
  • the construction of the press-in unit is simplified since no complex hydraulics are required.
  • the use of an environmentally unfriendly hydraulic fluid is avoided.
  • the rotary movements of the electric motor can also be used directly to control the casting process.
  • the respective position of the piston rod of the casting piston can be determined from the number of revolutions. It has proven to be particularly advantageous and suitable for driving the press-in unit of a die casting machine if the electric motor drives the casting piston via a spindle or a toothed rack, it being particularly advantageous to provide a ball screw as a spindle. In this embodiment, high propulsion speeds can be achieved at very high pressures, as are required for die casting machines, which was explained at the beginning.
  • Another embodiment provides a reduction designed between the electric motor and the casting piston. As a result, different pressures due to different torque forces can also be achieved, so that the drive can also be used with larger machines.
  • the electric motor can be a multi-stage electric motor, as a result of which the performance adjustment mentioned at the outset, which is required for the press-in unit of die casting machines, is possible both with regard to the speeds and also with regard to the forces to be generated.
  • water cooling can be provided for the electric motor itself if its output needs to be increased.
  • the press-in unit (10) shown in FIG. 1 comprises an electric motor (20) which is designed as a two-stage servo motor with two stators (21, 22) arranged within a housing (28) and rotors (23 and 24) associated with these stators.
  • the rotors (23, 24) are firmly connected to a nut (25) which is arranged between them and which a thread (26) receives a threaded portion (14) of a ball screw (13).
  • the spindle (13) extends coaxially to the axis of rotation of the rotors (23, 24).
  • the rotors are hollow and form a protective housing for the threaded section (14) of the spindle (13), which completely encapsulates the threaded section (14).
  • the spindle shaft which is led out of the area of the rotors (23, 24) through the bore (30), extends through an opening (15), provided with a seal (31), in a housing (11) of the casting chamber into the interior ( 12) the same.
  • a seal can also be provided on the bore (30).
  • the end (13a) of the spindle (13) is connected in the interior (12) of the casting chamber via a coupling (32) to one end of a piston rod (16).
  • the casting piston which serves to press the casting material into the mold from the inside of the casting chamber as described above.
  • a locking part for such a shape is familiar to the person skilled in the art and e.g. known from WO 91/06 415 A1.
  • the spindle (13) and thus also the piston rod (16) are set into a longitudinal movement in the sense of the double arrow shown by rotating the nut (25) which is fixedly connected to the rotors (23, 24) of the electric motor (20) .
  • the electric motor (20) can be operated at two speed levels using a regulating and control device (27). Its performance can be changed by switching the second stator on or off.
  • the electric piston (20) can therefore act on the casting piston both at different speeds and with different forces.
  • the spindle (13) is designed as a ball screw. This is clear from the details of Figure 2.
  • the power transmission from the electric motor to the casting piston is decisively improved by this configuration.
  • the embodiment shown in the drawing shows a two-stage servo motor.
  • other electric drives can also be used.
  • the threaded portion (14) is equipped according to the principle of a ball screw with a thread of high accuracy, the threads of which have a cross-section adapted for the circulation of balls, which is in a corresponding thread (33) on the inside the mother (25) continues.
  • the balls (34) are circulated in the threads of the spindle (13) in the corresponding threads (33) of the nut (25) in a known manner. They leave the threads at point (35) and are led to an entry point (36) via a deflection channel (37), from where they turn during the rotation of the nut (25) caused by the rotary movement of the rotors (23, 24) is triggered, get back into their threads.
  • the nut (25), as shown in Figure 2, is composed of two parts, each of which adjoins with a flange (38) and is held in place by a bolt (40), which is held in place by flanges (41), with the interposition of a preload adjuster (39) Rotors (23 and 24) and through the flanges (38) of the two nut parts.
  • the nut (25) is rotatably connected to the rotors (23 and 24). If the stators (21 and 22) are therefore acted upon individually or jointly or if the rotors (23 and 24) are appropriately controlled in a likewise known manner, the nut (25) is set into corresponding rotary movements. This rotary movement causes the spindle (13) to move axially in the desired manner, which moves the casting piston.
  • the advantage of using an electric motor to drive the casting piston also lies in the advantages already mentioned in the fact that it is not necessary to build up a driving pressure for the casting piston first, as is the case with hydraulic drives, but that the casting piston always has a precisely defined one Power can be set in motion depending on the voltage applied.
  • the parameters important for controlling the press-in unit (10) can be easily determined. Since the nut (25) is always connected to the spindle (13), the number of revolutions of the nut (25) or of the rotors (23, 24) clearly indicates the position of the casting piston in the press-in unit. By using a speed sensor, the speed and thus the position of the casting piston can be determined at any time. This can be used for control in a known manner be without special precautions for detecting the position of the casting piston are necessary.
  • the press-in unit according to the invention can be used both in hot chamber and in cold chamber casting machines.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Press Drives And Press Lines (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Magnetic Resonance Imaging Apparatus (AREA)
  • Luminescent Compositions (AREA)
  • Cold Air Circulating Systems And Constructional Details In Refrigerators (AREA)
  • Control Of Presses (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
  • Transmission Devices (AREA)
EP94103175A 1993-03-30 1994-03-03 Unité pour enfoncer du métal liquide Expired - Lifetime EP0618025B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4310310A DE4310310A1 (de) 1993-03-30 1993-03-30 Einpreßaggregat
DE4310310 1993-03-30

Publications (2)

Publication Number Publication Date
EP0618025A1 true EP0618025A1 (fr) 1994-10-05
EP0618025B1 EP0618025B1 (fr) 1998-05-13

Family

ID=6484228

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94103175A Expired - Lifetime EP0618025B1 (fr) 1993-03-30 1994-03-03 Unité pour enfoncer du métal liquide

Country Status (6)

Country Link
US (1) US5482101A (fr)
EP (1) EP0618025B1 (fr)
JP (1) JP3348958B2 (fr)
AT (1) ATE166010T1 (fr)
DE (2) DE4310310A1 (fr)
ES (1) ES2117163T3 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1057560A1 (fr) * 1999-06-01 2000-12-06 Oskar Frech Gmbh & Co. Unité d'injection pour une machine de coulée sous pression
CN117267285A (zh) * 2023-11-21 2023-12-22 山西汤荣机械制造股份有限公司 一种便于散热的制动鼓及其铸造装置

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7387253B1 (en) * 1996-09-03 2008-06-17 Hand Held Products, Inc. Optical reader system comprising local host processor and optical reader
DE59906506D1 (de) * 1999-04-13 2003-09-11 Frech Oskar Gmbh & Co Warmkammer-Druckgiessmaschine
EP1201334B1 (fr) * 2000-10-27 2005-03-23 Oskar Frech GmbH + Co. KG Machine à couler sous pression à chambre chaude et procédé de coulée correspondant
DE50206474D1 (de) * 2001-04-19 2006-05-24 Demag Ergotech Gmbh Plastifiziereinheit mit einem elektromotorischen spindelantrieb für eine spritzgiessmaschine
US7172085B2 (en) * 2001-12-04 2007-02-06 Beaudette Susan A Squeezable, fillable feeding device
JP2006142369A (ja) * 2004-11-24 2006-06-08 Ykk Corp 電動式射出ユニット及び同ユニットを備えたダイキャストマシンと電動式射出方法
JP2009297771A (ja) * 2008-06-17 2009-12-24 Sumitomo Heavy Industries Techno-Fort Co Ltd 鍛造プレスにおけるノックアウト装置
CN104675784A (zh) * 2013-11-30 2015-06-03 富泰华工业（深圳）有限公司 旋转下压气缸

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1804261A1 (de) * 1968-06-18 1970-05-14 Druckguss Heidenau Veb Einpresssystem fuer Druckgiessmaschinen
AT292222B (de) * 1969-04-28 1971-08-25 Peter Florjancic Spindel-Schließvorrichtung, insbesondere für Spritzguß-Maschinen
DE2922914A1 (de) * 1979-06-06 1980-12-11 Oskar Frech Werkzeugbau Gmbh & Verfahren und anordnung zum steuern des einpressvorganges bei kaltkammer- druckgussmaschinen
WO1991006415A1 (fr) * 1989-11-06 1991-05-16 Cincinnati Milacron Inc. Systeme de serrage de moule

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61220817A (ja) * 1985-03-28 1986-10-01 Fanuc Ltd 射出成形機の計量混練方式
JPS61235119A (ja) * 1985-04-12 1986-10-20 Nissei Plastics Ind Co 射出成形機の射出制御方法及び装置
GB8927088D0 (en) * 1989-11-30 1990-01-31 Frys Metals Ltd Casting apparatus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1804261A1 (de) * 1968-06-18 1970-05-14 Druckguss Heidenau Veb Einpresssystem fuer Druckgiessmaschinen
AT292222B (de) * 1969-04-28 1971-08-25 Peter Florjancic Spindel-Schließvorrichtung, insbesondere für Spritzguß-Maschinen
DE2922914A1 (de) * 1979-06-06 1980-12-11 Oskar Frech Werkzeugbau Gmbh & Verfahren und anordnung zum steuern des einpressvorganges bei kaltkammer- druckgussmaschinen
WO1991006415A1 (fr) * 1989-11-06 1991-05-16 Cincinnati Milacron Inc. Systeme de serrage de moule

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1057560A1 (fr) * 1999-06-01 2000-12-06 Oskar Frech Gmbh & Co. Unité d'injection pour une machine de coulée sous pression
WO2000072998A1 (fr) * 1999-06-01 2000-12-07 Oskar Frech Gmbh + Co. Ensemble d'injection pour machine de coulee sous pression
US6581670B1 (en) 1999-06-01 2003-06-24 Oskar Frech Gmbh & Co. Injection unit for a pressure die casting machine
CZ300224B6 (cs) * 1999-06-01 2009-03-25 Oskar Frech Gmbh + Co. Výtlacný agregát pro tlakový licí stroj
CN117267285A (zh) * 2023-11-21 2023-12-22 山西汤荣机械制造股份有限公司 一种便于散热的制动鼓及其铸造装置
CN117267285B (zh) * 2023-11-21 2024-02-02 山西汤荣机械制造股份有限公司 一种便于散热的制动鼓及其铸造装置

Also Published As

Publication number Publication date
ES2117163T3 (es) 1998-08-01
ATE166010T1 (de) 1998-05-15
DE59405931D1 (de) 1998-06-18
US5482101A (en) 1996-01-09
JP3348958B2 (ja) 2002-11-20
DE4310310A1 (de) 1994-10-06
EP0618025B1 (fr) 1998-05-13
JPH0747461A (ja) 1995-02-21

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