WO2005023459A1 - Systeme d'alimentation fluidique pour moulage - Google Patents

Systeme d'alimentation fluidique pour moulage Download PDF

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Publication number
WO2005023459A1
WO2005023459A1 PCT/AU2004/001221 AU2004001221W WO2005023459A1 WO 2005023459 A1 WO2005023459 A1 WO 2005023459A1 AU 2004001221 W AU2004001221 W AU 2004001221W WO 2005023459 A1 WO2005023459 A1 WO 2005023459A1
Authority
WO
WIPO (PCT)
Prior art keywords
fluid
furnace
feed system
further characterized
charging well
Prior art date
Application number
PCT/AU2004/001221
Other languages
English (en)
Inventor
Robert Bend
Original Assignee
Equipment Merchants International, Inc.
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 claimed from AU2003904968A external-priority patent/AU2003904968A0/en
Application filed by Equipment Merchants International, Inc. filed Critical Equipment Merchants International, Inc.
Publication of WO2005023459A1 publication Critical patent/WO2005023459A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D35/00—Equipment for conveying molten metal into beds or moulds
    • B22D35/04—Equipment for conveying molten metal into beds or moulds into moulds, e.g. base plates, runners
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D18/00—Pressure casting; Vacuum casting
    • B22D18/04—Low pressure casting, i.e. making use of pressures up to a few bars to fill the mould

Definitions

  • the present invention relates to a means and method for feeding fluid to a casting application.
  • a typical casting apparatus for counter gravity filling comprises a tower or reverbatory melting furnace in which the aluminium is melted, from here it is then laundered to a holding furnace, from which the liquid metal is pumped either by an electromagnetic or pneumatic system, to the mould.
  • the consistency of the molten metal feed rate provided to the mould is critical to the quality of the casting, and the efficiency of the operation.
  • a major factor in the consistency of electromagnetic pump counter gravity filling systems is the level of the metal in the holding furnace system. In well-controlled systems the metal level in a holding furnace can be maintained at +/-3mm.
  • a method used to offset fluctuations in the holding furnace is to change the power supplied to the electromagnetic pump.
  • the operating technique is for the molten metal to be held at the discharge point of the pump assembly. It is maintained at this point by applying energy to the electromagnetic pump, known as the pump bias voltage (PBV).
  • PBV pump bias voltage
  • While controlling the level using the PBV is effective, it also has an affect upon the fill rate of the mold, as electromagnetic pumps are not linear over the voltage range. If the starting point for a given program is at a higher voltage it will either reduce or increase the fill rate depending on where the voltage in the program falls on the power flow rate curve. As outlined above, any irregularity in fill rate can have a detrimental effect on the quality of the casting.
  • a fluid feed system for a casting application including a furnace, a transfer launder drawing fluid from said furnace, a charging well, fluid communication means between said furnace and said charging well, sensing means for measuring the fluid level in said furnace, and fluid displacement means incorporated in the charging well, which are adapted to effect displacement of the fluid between the charging well and the furnace, wherein the fluid displacement means is actuated in response to inputs from the sensing means.
  • a control system is used to continuously control the fluid displacement means in response to inputs from the sensing means.
  • the fluid is molten metal.
  • the furnace is a holding furnace.
  • the sensing means is a laser.
  • the fluid displacement means includes a body attached to manipulation means, which is lowered into the charging well, thereby displacing the fluid.
  • the manipulation means is a linear actuator.
  • the fluid displacement means includes a gaseous pressurising means, that increases the pressure in a region enclosed above the fluid in the charging well, thereby displacing the fluid.
  • the gas is nitrogen.
  • the charging well is enclosed by a steel lid.
  • the gaseous pressurising means is a portable device adapted for use with a variety of fluid feeding systems.
  • the portable gaseous pressurising means includes a hollow ceramic tube, and a steel lid incorporating the gas fittings, adapted for insertion in an open portion of the holding furnace, such as the charging well.
  • the invention may be said to lie in a method of controlling fluid levels in a fluid feed system for a casting application, the fluid feed system including a furnace, a transfer launder drawing fluid from said furnace, a charging well, fluid communication means between said furnace and said charging well, sensing means for measuring the fluid level in said furnace, and fluid displacement means incorporated in the charging well, wherein if the level of the fluid in the holding furnace departs from a desired level, the level sensing means generates the appropriate signal as an input signal to the control system, which will control the fluid displacement means as required, in order to restore fluid levels in the furnace to the desired level.
  • FIGS 1 and 2 are cross-sectional views through the feeding system according to the preferred embodiment.
  • Figures 3 and 4 are cross-sectional views through a feeding system according to a second embodiment of the present invention.
  • a feeding system 1 having a holding furnace 2, and charging well 4, containing molten metal 5.
  • the holding furnace 2 and charging well 4 are separated by a common wall 6, which has a molten metal communication passage 7 therein, at its top.
  • the holding furnace 2 has a plurality of heating elements 10 suspended above it, so as to keep the molten metal at a desired temperature.
  • the holding furnace 2 is provided therein with a level sensing means 40 for detecting the level of the molten metal in the holding furnace.
  • the level sensing means is a laser, using triangulation, and which reads the metal level at a frequency of 250Hz and a resolution of 0.025mm. It is to be understood by a person skilled in the art, that there are other devices which may be used for this purpose however.
  • the metal displacement means takes the form of a ceramic, or metal block 30 suspended above the charging furnace via an actuating means, such as a hydraulic or pneumatic cylinder 35.
  • an actuating means such as a hydraulic or pneumatic cylinder 35.
  • the level sensing means When the level of the molten metal in the holding furnace 2 departs from the desired level, the level sensing means generates the appropriate signal as an instruction signal to the pneumatic cylinder, which will in turn manipulate the ceramic block 30 accordingly. If the level in the holding furnace 2 drops, the actuating cylinder 35 will lower the block 30 into the charging furnace 4, thereby displacing molten metal over the common wall 6 into the holding furnace.
  • FIGS 3 and 4 illustrate a further embodiment of the present invention, wherein the charging furnace 40, is a closed vessel provided with a gas inlet 45 and outlet 50; the charging furnace is provided with a gas that will applies pressure to the to the interior of the charging well, thereby forcing molten metal through a passage in the common wall 55 in the bottom of the furnace.
  • this gas charging system can in response to inputs from the metal level sensing laser, control the molten metal level in the holding furnace.
  • a significant advantage of the furnace according to the present invention is that the holding furnace will keep a constant level (+/- 0.5mm) even as metal is fed to the holding launder and mould, resulting in greater control of the filling of the mould.
  • Another advantage of the present invention is that the electromagnetic pump is situated in the furnace, and the molten metal is drawn directly from the furnace. Given the critical effects of temperature on metal and casting characteristics, this is a significant advantage.
  • the feeding system according to the present invention is ideally adapted to facilitate ease of maintenance operations.
  • the pump is made from ceramic materials, and is removably immersed in the furnace, such that it can be quickly and easily removed from the molten metal if maintenance is required. Consequently, there is no need to remove any molten metal from the furnace in order to carry out maintenance.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)

Abstract

Cette invention concerne un système d'alimentation fluidique (1) pour moulage, comprenant un four (2), une goulotte de transfert (15) pour le passage du fluide hors du four, un puits de charge (4), des moyens de communication fluidique (7) entre ledit four et ledit puits de charge, des moyens de détection (40) qui mesurent le niveau du fluide dans le four et des moyens de déplacement du fluide (30) intégrés au puits de charge. Concrètement, si le niveau du fluide dans le four dévie d'un niveau souhaité, les moyens de détection de niveau produisent un signaI d'entrée dans un système de commande, lequel agit en permanence sur les moyens de déplacement de fluide et rétablit au besoin le niveau de fluide requis dans le four.
PCT/AU2004/001221 2003-09-11 2004-09-10 Systeme d'alimentation fluidique pour moulage WO2005023459A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AU2003904968A AU2003904968A0 (en) 2003-09-11 Fluid feed system for a casting application
AU2003904968 2003-09-11

Publications (1)

Publication Number Publication Date
WO2005023459A1 true WO2005023459A1 (fr) 2005-03-17

Family

ID=34230100

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU2004/001221 WO2005023459A1 (fr) 2003-09-11 2004-09-10 Systeme d'alimentation fluidique pour moulage

Country Status (1)

Country Link
WO (1) WO2005023459A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007025772A1 (de) * 2007-05-24 2008-11-27 Meltec Industrieofenbau Gmbh Schmelzentiegel mit Überlauf für eine Gießmaschine
JP2015009252A (ja) * 2013-06-28 2015-01-19 助川電気工業株式会社 ダイカストスリーブ溶融金属供給装置とその供給方法
JP2015037796A (ja) * 2013-08-19 2015-02-26 助川電気工業株式会社 ダイカストスリーブ溶融金属供給装置と供給方法
JP2016019998A (ja) * 2014-07-16 2016-02-04 トヨタ自動車株式会社 ダイカスト鋳造装置
JP2016022510A (ja) * 2014-07-22 2016-02-08 トヨタ自動車株式会社 ダイカスト鋳造装置及びダイカスト鋳造方法
CN107470606A (zh) * 2017-09-30 2017-12-15 湖北启宏热工设备有限公司 一种铝合金定量浇注炉
CN110405186A (zh) * 2019-07-29 2019-11-05 安徽三环水泵有限责任公司 一种多级离心泵壳体浇铸成型系统

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2223969A (en) * 1988-10-13 1990-04-25 Electricity Council Dispensing apparatus for molten metal
CA2086879A1 (fr) * 1993-01-07 1994-07-08 Henry Meyer Procede et dispositif pour injecter une quantite mesuree de metal en fusion
JP2003126951A (ja) * 2001-10-24 2003-05-08 Japan Steel Works Ltd:The 低融点金属材料用の金属射出成形装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2223969A (en) * 1988-10-13 1990-04-25 Electricity Council Dispensing apparatus for molten metal
CA2086879A1 (fr) * 1993-01-07 1994-07-08 Henry Meyer Procede et dispositif pour injecter une quantite mesuree de metal en fusion
JP2003126951A (ja) * 2001-10-24 2003-05-08 Japan Steel Works Ltd:The 低融点金属材料用の金属射出成形装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Derwent World Patents Index; Class M22, AN 2003-649338 *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007025772A1 (de) * 2007-05-24 2008-11-27 Meltec Industrieofenbau Gmbh Schmelzentiegel mit Überlauf für eine Gießmaschine
JP2015009252A (ja) * 2013-06-28 2015-01-19 助川電気工業株式会社 ダイカストスリーブ溶融金属供給装置とその供給方法
JP2015037796A (ja) * 2013-08-19 2015-02-26 助川電気工業株式会社 ダイカストスリーブ溶融金属供給装置と供給方法
JP2016019998A (ja) * 2014-07-16 2016-02-04 トヨタ自動車株式会社 ダイカスト鋳造装置
JP2016022510A (ja) * 2014-07-22 2016-02-08 トヨタ自動車株式会社 ダイカスト鋳造装置及びダイカスト鋳造方法
CN107470606A (zh) * 2017-09-30 2017-12-15 湖北启宏热工设备有限公司 一种铝合金定量浇注炉
CN110405186A (zh) * 2019-07-29 2019-11-05 安徽三环水泵有限责任公司 一种多级离心泵壳体浇铸成型系统

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