EP1402977B1 - Schutzgaseinrichtung für Druckgussmaschinen - Google Patents

Schutzgaseinrichtung für Druckgussmaschinen Download PDF

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Publication number
EP1402977B1
EP1402977B1 EP02021445A EP02021445A EP1402977B1 EP 1402977 B1 EP1402977 B1 EP 1402977B1 EP 02021445 A EP02021445 A EP 02021445A EP 02021445 A EP02021445 A EP 02021445A EP 1402977 B1 EP1402977 B1 EP 1402977B1
Authority
EP
European Patent Office
Prior art keywords
pressure
shielding gas
shielding
gas device
gas
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
EP02021445A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1402977A1 (de
Inventor
Norbert Dr.-Ing. Erhard
Ulrich Schrägle
Gerd Mentel
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
Priority to DE50211923T priority Critical patent/DE50211923D1/de
Application filed by Oskar Frech GmbH and Co KG filed Critical Oskar Frech GmbH and Co KG
Priority to ES02021445T priority patent/ES2302776T3/es
Priority to AT02021445T priority patent/ATE389483T1/de
Priority to EP02021445A priority patent/EP1402977B1/de
Priority to US10/529,080 priority patent/US7290588B2/en
Priority to AU2003262517A priority patent/AU2003262517A1/en
Priority to PCT/EP2003/010450 priority patent/WO2004030849A1/de
Priority to PL375750A priority patent/PL206577B1/pl
Priority to JP2004540657A priority patent/JP4537204B2/ja
Priority to CZ2005153A priority patent/CZ2005153A3/cs
Publication of EP1402977A1 publication Critical patent/EP1402977A1/de
Priority to HK04104452A priority patent/HK1061541A1/xx
Application granted granted Critical
Publication of EP1402977B1 publication Critical patent/EP1402977B1/de
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
    • B22D21/00—Casting non-ferrous metals or metallic compounds so far as their metallurgical properties are of importance for the casting procedure; Selection of compositions therefor
    • B22D21/002—Castings of light metals
    • B22D21/007—Castings of light metals with low melting point, e.g. Al 659 degrees C, Mg 650 degrees C
    • 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
    • B22D17/30—Accessories for supplying molten metal, e.g. in rations

Definitions

  • the invention relates to a protective gas device for a die-casting machine, which includes at least one melting furnace, in particular for processing magnesium melts, with openings in the furnace for supplying the protective gases, with various sources of inert gas, with a downstream container for receiving a mixture of individual shielding gases and with at least one metering device, via which the container communicates with the openings of the melting furnace.
  • the magnesium melts contained in the melting furnace of die-casting machines must be covered with an inert gas mixture.
  • mixtures of carrier gases, and sulfur hexafluoride (SF 6 ) or sulfur dioxide (SO 2 ) are used, such as N 2 and SF 6 , dry air and SF 6 or dry air with SO 2 .
  • the aim is to keep the concentration of Inertgasanteile in the mixture as low as possible.
  • the individual components are filled at relatively low pressure (0.8 to 1.5 bar) by quantitatively matched supply in a container from which the gas mixture is removed and fed to the melt surface.
  • the type of mixing process usually leads to stratification or it can not be ensured that it does not come to that. Stratification can also occur if the gas has not mixed properly and then settles due to the influence of gravity. A homogeneous mixture is not formed. When gas is removed, the resulting concentration fluctuations influence the inerting effect. Too low inert gas concentration causes burning; too high a concentration to corrosion behavior at the melting furnace and at the pouring unit as well as to unnecessarily high defective emission.
  • the inlet openings are grouped together and connected to different dosing devices, eg for one or more ovens, then changes in the dosing of one inlet opening have an influence on the dosing at the other inlet openings.
  • the setting is usually very difficult.
  • local over or underdosing in the oven can occur in this way. It can in the furnace chamber above the melt areas of SF 6 enrichment and sites of SF 6 depletion occur, which is referred to as concentration shadows.
  • concentration shadows If a change in the dosage is desired in the known types, for example in different modes such as normal operation, cleaning, emergency operation, then the setting must be determined and adjusted in each case. In a complex manner, the amount of mixed gases must be adapted to the operating state.
  • WO 99/02287 A1 discloses a shielding gas device for a die-casting machine for processing magnesium melts, comprising a dry air and SO 2 gas source, a coupled to these gas sources mixing unit with a flow regulator for the two shielding gases and a control unit for monitoring and adjusting the composition and supply amount of the Comprises gas mixture.
  • the two gas supply lines to a further gas mixture line, in which the two gases mix and from the gas mixture is introduced into one or more furnaces, in the latter case associated branch lines with flow meter and valve elements for dividing the protective gas mixture on the individual furnaces are provided.
  • the present invention has for its object, a protective gas device of the type mentioned in such a way that a simple and reaction-free Schutzgasbeetzschlagung the melts is achieved and the aforementioned problems are avoided.
  • the dosing can be continuous or discontinuous, ie pulsating. In the latter case, so with intermittent admission of the inlet nozzle, even small amounts can be metered controlled without the risk that then due to low pressure no beam expansion, ie no "atomization" takes place.
  • an arrangement with which to "atomize” requires two preconditions, namely, on the one hand, a certain pressure and, on the other hand, a certain volume through which a back pressure from the nozzle is established. Will that be Volume so small that this back pressure can not be maintained, would be the Verdüsungs bin away.
  • the metering device can intermittently, so pulsating, provide the gas and so on average reduce the fumigation, although the system in the Begasungsart still works. A mechanical adjustment of the nozzle itself to this least quantity dosage is therefore not necessary.
  • the inlet nozzles are arranged distributed on the furnace so that a gas flow to the already existing leaks of the furnace is formed, so that in this way a uniform concentration distribution is ensured.
  • weaks is intended here all intentional and unwanted openings of the furnace, such as. Charging openings, cleaning holes and actually leaking bodies are understood.
  • the inlet nozzles are also arranged to be protected from contamination or clogging.
  • the operating pressure of the metering device which is kept constant, is matched to the type of inlet nozzles and thus also to the desired distribution principle of the gas mixture in the oven.
  • the inlet pressure at the metering unit ie, the pressure in the accumulator is also monitored, so that the operating pressure for the metering device can be maintained. If the pressure drops for any reason, the dosing unit can be switched to emergency gassing via appropriate signals, which also trigger visual indications, and open the gas outlet.
  • the dosage ie the desired amount of gas
  • different groups of inlet nozzles can be operated via several dosing units. Adjusting the amount of one group of inlet nozzles does not affect the amount of the other group and also does not affect mixture formation, i. on the concentration of the protective gas.
  • a plurality of metering devices can also be connected in parallel to one another for different furnaces and supplied by the pressure accumulator.
  • Each dosing unit can be provided with a device for adjusting the dosing, with each dosing unit is assigned a mode button in a simple manner, via which the operator can determine the dosing.
  • Each dosing unit can also be provided in a development of the invention with a control logic that receives signals about the oven status. In this way, an automatic control of the protective gas concentration can be achieved.
  • the accumulator is preceded by a mixing device with a mixing chamber in which the gases forming the inert gas mixture are combined under pressure.
  • the system pressure of this mixing device can be adjusted to the operating pressure of the metering devices.
  • the system pressure of the mixing device must be chosen sufficiently higher than the operating pressure of the dosing devices.
  • each pressure control means are assigned and also equal pressure regulator for maintaining Pressure to achieve a constant pressure control between the carrier gas and inert gas can be provided.
  • This embodiment has the advantage that the mixing gases, i. the constituents of the protective gas are formed under turbulent flow in the set mixing ratio in the mixing chamber and then fed to the pressure vessel.
  • the mixing of gases works without any electrical energy input. Even in the event of a power failure, it is therefore possible to generate exactly the mixture as long as there are sufficient mixing gases.
  • the concentration is not changed.
  • the system mixing device and metering device is thus able to keep the concentration even in case of power failure. Only the dosing quantity goes back to fixed continuously dosed emergency gassing quantities. The emergency operation can be run in a de-energized state, which is naturally indicated by signaling devices.
  • a mixing device with a pressure accumulator can, as already mentioned, supply a plurality of metering units which act either on different inlet nozzle groups on a furnace or also on several furnaces whose metered quantities are independent.
  • the change in the operating state of a melting furnace and thus necessary changes in its dosage, have no effect on the other furnaces.
  • the pressure in the pressure accumulator is monitored and for this purpose may be provided, for example, in the connecting line between the mixing chamber and accumulator pressure monitoring device.
  • the mixing chamber can be assigned to a gas analyzer, with which the concentration the gas mixture is controllable.
  • This gas analyzer can easily compare the gas mixture of the mixing chamber with a reference gas mixture and in case of deviations emit a signal to the mixing device, via which the supply of the mixed gases can be controlled.
  • the Fig. 1 framed dot-dash lines to recognize a melting furnace 1, the molten bath to be covered with inert gas.
  • This melting furnace 1 is in detail from the 4 and 5 can be seen and explained there.
  • the gas mixing and metering unit provided for pressurizing the melting furnace 1 with protective gas initially exists from a gas mixing unit 2, whose construction is based on Fig. 2 is shown.
  • This gas mixing unit is the one used, the inert gas used, ie SF 6 or SO 2 in the direction of arrow 3, and a carrier gas, for example, nitrogen N 2 in the direction of arrow 4.
  • the mixing of these two components is carried out under pressure, as in more detail based on Fig. 2 will be explained.
  • the protective gas mixture thus formed is then held within the gas mixing unit in a pressure accumulator, from which protective gas is continued via the connecting line 5 and 6 to metering devices 7 and 7a.
  • the structure of these metering devices is out Fig. 3 recognizable. Further metering devices can be connected to the continuing line 6 '. From the metering devices 7 and 7a, the protective gas is passed via the connecting lines 8 and 8a to inlet nozzles 9 and 9a and enters there into the space of the melting furnace 1 above the melt. This will be explained in detail on the basis of 4 and 5 described.
  • Fig. 2 shows that the protective gas, so for example SF 6 through the terminal 3 and carrier gas eg N 2 is given through the port 4 in the mixing device 2, wherein both mixed gases each pass through a filter 10 in the lines 11 and 12. From a central monitoring logic 13 while an input pressure monitoring 14 is made and the pressure in these input lines 11 and 12 respectively displayed by respective pressure gauge assemblies 15. With a pneumatic constant pressure control 16 it is ensured that the pressure in the two supply lines 11 and 12 of the mixed gases supplied is in each case the same. The gases are kept under a pressure of at least 5 bar.
  • the concentration setting of the guided through the conduit 11 protective gas takes place at the point 17.
  • the parallel feed line 12 of the carrier gas is a corresponding throttle point 18 and both Pressure lines 11 and 12 are led to a mixing chamber 19, in which the two gases each exit from nozzles 20 under pressure and can be guided in the resulting turbulent flow to a homogeneous mixture.
  • This homogeneous gas mixture is then fed to a pressure accumulator 21 via the line 22, the pressure of which is monitored via an outlet pressure monitor 23 of the monitoring logic 13 and again displayed via a pressure gauge 15.
  • a homogeneous mixed gas is stored depending on the inlet pressure (here 4 - 5 bar), which can then be passed via the continuing line 5 to one or more metering devices 7.
  • the Fig. 3 shows as an exemplary embodiment, the metering device 7 of Fig.1 of which the mixed gas is supplied under pressure through the conduit 5.
  • a filter 10 upstream of a secondary line 24 whose pressure is monitored via the device 25 and a central dosing logic and monitoring device 26 and also adjusted centrally via the devices 27 and 28 and the central controller 29 to a certain operating pressure, approximately in of the order of 1.8 to 3.0 bar.
  • This pressure can be visualized via a pressure gauge 10.
  • a device 33 for determining the respective operating mode, ie for determining the dosage is provided, wherein in a practical embodiment, various buttons can be provided which can be actuated by the operator. These keys are symbolized by the arrows 34.
  • the central dosing logic is also provided with signal inputs 35 from the die casting machine and the melting furnace 1 ago and corresponding Signal outputs to the oven and to the die casting machine are indicated by the arrows 36. Finally, the central dosing logic also has a device 37 for signaling the operating state and for indicating any faults.
  • the outlet line 8 is provided in the embodiment with an optical display device 38 for displaying the flow.
  • the melting furnace 1 shown in the embodiment has a removal chamber 39 and a storage chamber 40, which are separated by a wall 41 from each other. In both chambers melt is up to level 42 and the space 43 and 43a above the melt level is applied to the protective gas mixture.
  • the removal chamber 39 is in a known manner - it is hot chamber die casting machine - the melt removal device 44.
  • the pressure lines 8 and 8a, which lead the inert gas mixture respectively to inlet nozzles 9 and 9a are here (pressure line 8) of the extraction chamber 39 and (pressure line 8a) associated with the melting chamber 40.
  • the intake nozzles 9 for the removal are, as Fig.
  • the Fig. 6 shows by way of example one of these pressure inlet nozzles 9, which is provided with a screw thread 48 for attachment to corresponding pressure lines and with a throttle 49 or with an orifice behind which the gas under pressure undergoes a beam expansion, resulting in a turbulent and for a uniform distribution caring blurring in the rooms 43 and 43a provides.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Encapsulation Of And Coatings For Semiconductor Or Solid State Devices (AREA)
  • Furnace Details (AREA)
  • Fluid-Damping Devices (AREA)
  • Presses And Accessory Devices Thereof (AREA)
  • Moulding By Coating Moulds (AREA)
  • Coating With Molten Metal (AREA)
EP02021445A 2002-09-25 2002-09-25 Schutzgaseinrichtung für Druckgussmaschinen Expired - Lifetime EP1402977B1 (de)

Priority Applications (11)

Application Number Priority Date Filing Date Title
ES02021445T ES2302776T3 (es) 2002-09-25 2002-09-25 Dispositivo de gas de proteccion para maquinas de colada a presion.
AT02021445T ATE389483T1 (de) 2002-09-25 2002-09-25 Schutzgaseinrichtung für druckgussmaschinen
EP02021445A EP1402977B1 (de) 2002-09-25 2002-09-25 Schutzgaseinrichtung für Druckgussmaschinen
DE50211923T DE50211923D1 (de) 2002-09-25 2002-09-25 Schutzgaseinrichtung für Druckgussmaschinen
AU2003262517A AU2003262517A1 (en) 2002-09-25 2003-09-19 Protective gas device for pressure die-casting machines
PCT/EP2003/010450 WO2004030849A1 (de) 2002-09-25 2003-09-19 Schutzgaseinrichtung für druckgussmaschinen
US10/529,080 US7290588B2 (en) 2002-09-25 2003-09-19 Protective gas device for pressure die-casting machines
PL375750A PL206577B1 (pl) 2002-09-25 2003-09-19 Urządzenie z gazem obojętnym dla maszyn do odlewania ciśnieniowego
JP2004540657A JP4537204B2 (ja) 2002-09-25 2003-09-19 ダイカストマシンのための保護ガス装置
CZ2005153A CZ2005153A3 (cs) 2002-09-25 2003-09-19 Zařízení pro ochranu plynem pro stroj pro lití pod tlakem
HK04104452A HK1061541A1 (en) 2002-09-25 2004-06-18 Shielding gas device for pressure die casting machines

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP02021445A EP1402977B1 (de) 2002-09-25 2002-09-25 Schutzgaseinrichtung für Druckgussmaschinen

Publications (2)

Publication Number Publication Date
EP1402977A1 EP1402977A1 (de) 2004-03-31
EP1402977B1 true EP1402977B1 (de) 2008-03-19

Family

ID=31970309

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02021445A Expired - Lifetime EP1402977B1 (de) 2002-09-25 2002-09-25 Schutzgaseinrichtung für Druckgussmaschinen

Country Status (11)

Country Link
US (1) US7290588B2 (ja)
EP (1) EP1402977B1 (ja)
JP (1) JP4537204B2 (ja)
AT (1) ATE389483T1 (ja)
AU (1) AU2003262517A1 (ja)
CZ (1) CZ2005153A3 (ja)
DE (1) DE50211923D1 (ja)
ES (1) ES2302776T3 (ja)
HK (1) HK1061541A1 (ja)
PL (1) PL206577B1 (ja)
WO (1) WO2004030849A1 (ja)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004026082A1 (de) * 2004-05-25 2005-12-15 Bühler AG Verfahren und Anlage zum Druckgiessen
US8932385B2 (en) 2011-10-26 2015-01-13 Air Liquide Industrial U.S. Lp Apparatus and method for metal surface inertion by backfilling
CN111360228B (zh) * 2020-04-08 2021-09-21 秦皇岛信能能源设备有限公司 轮毂压铸机炉体

Family Cites Families (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE736766C (de) * 1940-02-22 1943-06-28 Erich Herrmann & Co K G Giessmaschine, insbesondere zum Giessen oder Verpressen von Magnesium
US4065299A (en) * 1975-10-23 1977-12-27 Teledyne Industries, Inc. Magnesium reclamation process and apparatus
JPS57177871A (en) * 1981-04-28 1982-11-01 Tomoya Noguchi Method and device for low pressure casting
JPS6334564U (ja) * 1986-08-20 1988-03-05
US4846402A (en) * 1988-02-03 1989-07-11 Wheelabrator Air Pollution Control, Inc. Spray nozzle and method of preventing solids build-up thereon
JPH03258448A (ja) * 1990-03-09 1991-11-18 Toshiba Mach Co Ltd ダイカストマシン用電磁給湯装置
US5388633A (en) * 1992-02-13 1995-02-14 The Dow Chemical Company Method and apparatus for charging metal to a die cast
US5205346A (en) * 1992-06-11 1993-04-27 Cmi International Method and apparatus for countergravity casting molten metal
JP3174856B2 (ja) * 1993-05-07 2001-06-11 日本エア・リキード株式会社 混合ガス供給装置
JPH06328227A (ja) * 1993-05-14 1994-11-29 Sintokogio Ltd 反射炉へのガス供給方法及びその装置
US5540077A (en) * 1994-06-10 1996-07-30 Scott Specialty Gases, Inc. Method and gas mixture for calibrating an analyzer
JPH08143985A (ja) * 1994-11-24 1996-06-04 Tokai Rika Co Ltd マグネシウム溶湯の燃焼防止用保護ガス導入装置
NO304893B1 (no) * 1997-07-07 1999-03-01 Norsk Hydro As FremgangsmÕte for smelting av magnesium uten flussmiddel og utstyr for dette
AU4496699A (en) * 1998-04-27 1999-11-16 Kahn, Friedhelm Method for processing a molten metal mass, especially a molten light metal mass,and a dosing furnace which is encapsulated and which can be pressurized by prot ective gas
JP2001259400A (ja) * 2000-03-16 2001-09-25 Air Water Inc ガス混合装置およびその制御方法
FR2809643B1 (fr) * 2000-05-31 2002-10-25 Brochot Sa Procede et dispositif pour proteger un metal fondu non ferreux
US6742568B2 (en) * 2001-05-29 2004-06-01 Alcoa Inc. Casting apparatus including a gas driven molten metal injector and method

Also Published As

Publication number Publication date
DE50211923D1 (de) 2008-04-30
PL375750A1 (en) 2005-12-12
EP1402977A1 (de) 2004-03-31
JP2006500221A (ja) 2006-01-05
AU2003262517A1 (en) 2004-04-23
CZ2005153A3 (cs) 2005-10-12
JP4537204B2 (ja) 2010-09-01
HK1061541A1 (en) 2004-09-24
US7290588B2 (en) 2007-11-06
PL206577B1 (pl) 2010-08-31
ATE389483T1 (de) 2008-04-15
ES2302776T3 (es) 2008-08-01
US20060090874A1 (en) 2006-05-04
WO2004030849A1 (de) 2004-04-15

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