WO1997035679A1 - Procede et dispositif de simulation de remplissage de moules de fonderie - Google Patents
Procede et dispositif de simulation de remplissage de moules de fonderie Download PDFInfo
- Publication number
- WO1997035679A1 WO1997035679A1 PCT/FR1997/000515 FR9700515W WO9735679A1 WO 1997035679 A1 WO1997035679 A1 WO 1997035679A1 FR 9700515 W FR9700515 W FR 9700515W WO 9735679 A1 WO9735679 A1 WO 9735679A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- casting
- liquid
- mold
- computer
- flow
- Prior art date
Links
Classifications
-
- 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
- B22D18/08—Controlling, supervising, e.g. for safety reasons
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D46/00—Controlling, supervising, not restricted to casting covered by a single main group, e.g. for safety reasons
Definitions
- the present invention relates to a new method for simulating the flow of metal in foundry molds intended to concretely visualize the phenomena which occur during filling in the different casting modes - in gravity,
- the prior art has endeavored to resolve these two problems in particular since the 1950s and in two parts
- thermodynamics and mechanics including mainly those of conductivity, convection, radiation, changes of state to study heat exchanges in molds by reducing complex forms to combinations of simple elementary forms ( plates, cylinders, spheres) for which we knew how to calculate heat exchanges with the outside.
- the Simulation methods determine from a defined casting system the speed vector at each point of the mold (size and orientation), thus making it possible to predict the zones of turbulence, air entrainment, non-arrivals, etc. By iteration it is possible to modify the design of the casting system until there is a probability of a real satisfactory result in the subsequent casting with the metal,
- the simulation processes determine, for a defined mold structure (geometry, nature of the materials) the temperature evolution at each point, therefore the probability of metallurgical defects (shrinkage, large grains, etc.) .). They therefore allow, by iteration, to modify the indicated characteristics of the mold until obtaining, as previously, a probability of satisfactory result with the metal.
- the current simulation methods attach simultaneously to the two flows and are computer calculation methods which derive their justification from the agreement with the facts of the consequences which result therefrom, that is to say of the presence or not of metallurgical defects at the calculated endts
- the object of the present invention is to carry out a concrete visualization of the flow which would occur with the metal, in the entire mold and at room temperature.
- the metal is replaced by a liquid which has the same flow characteristics as the alloy concerned (viscosity, density) for the usual cases that are aluminum or magnesium alloys.
- These special process liquids are called SIMALLOYS®.
- the mold is produced in transparent walls, with the real shapes of the part to be studied, that is to say from the real foundry model if it exists,
- the essential object of the simulation apparatus is therefore to determine the casting parameters for the actual operation without modifying the shapes of the mold, which is a very significant economic advantage.
- FIG. 1 is the diagram of an installation allowing the process to be implemented for all of the flows controlled in "counter gravity”,
- FIG. 2 is a diagram of an installation allowing the implementation of the process for gravity casting
- a sealed tank 1 closed by a tray 2 contains a liquid 3 having the same viscosity and density as l alloy to be subsequently cast as part of the liquids previously named SIMALLOYS® For aluminum alloys
- the various liquids are introduced into or removed from the tank by a pump 4 associated with its inlet 5 or outlet 6 valves and its reservoirs 7.
- the liquids further include:
- This consists of walls of about 6 to 8 mm of transparent, flowable polymer, which polymerizes at room temperature, for example polyesters or epoxies.
- the shape is obtained by molding on the foundry model created for real operations with the metal. Blocks and cores are assembled and remoulded as on the real sand mold.
- tubes 13 provided with solenoid valves 14 are arranged on the mold. They remain open during filling and are closed by computer 0 when a presence sensor 15 at the top of the mold indicates that filling is finished.
- An identical outlet 16 with its solenoid valve 17 carries a pressure sensor 18 which measures the pressure in the mold during its evacuation or its filling. The information is transmitted to the computer which uses it for its piloting calculations.
- Presence sensors 19 with electrical detection already indicated on page 4 line 20 and constituted by metallic wires brought to potential about 24 volts, are placed in the mold to indicate to the computer the presence of the liquid which puts them at potential 0. These sensors are placed in places where the study of the part design predicts that changes in the speed of the liquid are necessary.
- the mold is under a sealed, transparent vacuum bell 20 which carries:
- Line 21 also carries an all-or-nothing shut-off valve 24 controlled by the computer and a fast vacuum line with piloted valve 23 j and flow regulator 23-. as on the pressurization line, - a vent valve 25 allowing the bell to be brought back to atmospheric pressure in a particular phase of the cycle,
- a pressure sensor 26 similar to 18 and which enters into operation after the stop of 18 after filling the mold.
- the sealed tank 1 is provided with a pressurization line 27 which comprises - nitrogen bottles 28 to 200 bars with pressure regulators 29 delivering a pressure of 3 bars in the circuit,
- this line 31 carries a set 32 of 15 branches grouped according to FIG. 7: the nitrogen for pressurization arrives at A and leaves at B -; on the entry ramp each branch from N ° 2 to N ° 15 carries a flow limiter 2 [ . 3 ⁇ 15 1 and a pilot valve 2 ⁇ 3 ⁇ .... 15 ⁇ - These two valves are at low flow (opening diameter 2 mm) flow also adjusted beforehand using the flow limiter when adjusting the device. They can operate from very low pressures, close to 0.
- the bypass N c l carries the same flow limiter l t and a valve identical to the preceding 1 7 and in addition a needle restrictor I3. This member is a flow regulator by the advancement by rotation of its conical needle moving in an opening of the same conicity. The rotation is done by a stepper motor 1 4 capable of turning in both directions and controlled by the computer.
- This set of bypass 1 operates in conjunction with an identical part of the line 33 in Figure 1 which ensures the decompression of the tank.
- This line 33 is divided into 2:
- piloted line 361 carrying the assembly 36 which has the same structure as the assembly 32 of the pressurization page 6 line 33 (15 piloted low flow valves with their flow limiters plus 1 needle restrictor and 1 motor pilot).
- the piloting principle is a new principle forming part of the invention. It is implemented in 2 distinct phases
- the pressurizing device During filling: at a given time t after the start of the cycle, the pressurizing device must ensure in the tank a rise speed of dP pressure - which will be variable along the cycle and is stored in the computer .
- the computer calculates the number of valves that it must open among the 15 constituting the assembly 32.
- the valve U is open and the needle restrictor 1 3 is in the position it had at the end of previous cycle.
- the flow rate of this set of branch No. 1 corresponds to leaks from the device and during filling this branch No. 1 remains in this position.
- the computer therefore opens n valves in the group from N c 2 to No. 15.
- the pressure sensor 37 fixed on the tank informs it of the pressure increase in a given time interval; if it is too weak the computer opens other valves, if it is too strong it closes.
- Valves 1 2 for assemblies 32 and 36 are open as shown on page 7 line 26.
- the computer O rotates the restrictor needle 1 3 by the motor 1 4 associated to the assembly 32 and the restrictor 3 by the needle 1 motor 1 4 associated with the assembly 36 in order to smoothly stabilize the pressure in the tank.
- the pressure sensor 37 (precision 1 millibar) informs the computer which plays with the motors 1 4 of the 2 lines to maintain the pressure level in this interval. This new valve piloting process could justify the term piloting in organ play R.
- the computer knows that it has to lower the 2 enclosures (with mold) to dP a given residual vacuum V c at a determined speed - but at all times keeping a pressure difference of between 30 and 40 millibars between the tank and the mold, the mold being at lower pressure to avoid it. - on the one hand that the air from the mold is not sucked into the tank through the tube and does not project the liquid (this would be the case if the mold was at a pressure higher than that of the tank),
- the tank alone descends to reach this level.
- the computer opens or closes in each set 23 and 36 the number of valves necessary to achieve this result.
- the computer implements the N ° 1 leads with restrictor - motor of assemblies 23 and 36 as for maintaining pressure described above.
- the 2 chambers are kept under vacuum until the operator and the computer have verified that all the conditions are satisfied for casting.
- the computer isolates the tank from the vacuum pump by closing the valve 38, it opens the valve to the tank 39 open air and it introduces nitrogen into the oven through the setting line. in pressure 27 It opens or closes the valves of the assembly 32 as indicated previously in the pouring in the absence of vacuum in order to respect the speeds of pressurization of the tank.
- the computer applies the overpressure (phase SP in figure 8) At the end of the overpressure the valve 25 for venting the bell opens and the bell 20 containing the mold is brought back to atmospheric pressure quickly (2-3 seconds) At the end of the overpressure there was between the tank and the bell a pressure difference ⁇ P figure 8. While the bell starts to pressure atmospheric the computer raises the pressure in the tank by the rapid inflation line 30 in Figure 1 to keep the same pressure difference ⁇ P between tank and bell. When the bell is at atmospheric pressure, the tank is at a final pressure P f which is maintained as for the maintenance described above (the valve 25 for venting to the open air is open and the branches No. 1 of the assemblies 32 and 36 operate by their engine)
- the 2 flanges of the pouring tube are provided with seals 41. 42. 43
- a leak along 41 would give movement of gas in the atmosphere-tank direction in the vacuum phases or in the cuv e-atmosphere direction in the pressure phases In no case would gas be introduced into the liquid contained in the pouring tube On the other hand at the upper seals 42. 43 a leak in the vacuum phases would introduce air into the liquid contained in the tube, liquid placed under approximately 30 millibars of residual vacuum
- the volume of the air bubble would be instantly multiplied by 300 and it would explode in the liquid in the form of a cloud of fine bubbles which would interfere with all observations.
- the volume would be multiplied by 1000 due to the simultaneous effect of vacuum and temperature (750 ° C) and the part would be unusable.
- the seals 42 and 43 must therefore ensure a perfect seal with a vacuum face.
- the simulation machine is provided with a watertight and elastic bellows 44 which connects the 2 plates 2 and 1 1.
- the bellows is metallic to represent the operation of the same bellows which will be placed on the real machine.
- the chamber 45 thus formed between the 2 plates and the pouring tube is placed in communication with the vacuum chamber containing the mold through the orifice 46.
- the chamber 45 and the chamber 10 are therefore at the same pressure throughout the cycle .
- the seal 41 has between its 2 faces a pressure difference of about 30 millibars which is that existing during the vacuuming between the bell and the oven. It is therefore very little used and its operation is, as indicated, without influence on the liquid.
- This plate 47 carries a seal 49 in its cold part and therefore the seals 42 and 43 are at the same pressure on their internal face (liquid side) and external (seal side 49) and no gas bubble can pass through liquid or metal O 97/35679 PC17FR97 / 00515
- This set of arrangements built around the bellows 44 is essential for the quality of the observations in the simulation machine and for the quality of the part cast in the real machine.
- This sensor is necessary to obtain correct control, that is to say to obtain at a given instant after the start of the injection,
- the liquid has a predetermined position, - with a predetermined vertical speed on the front of the liquid.
- ⁇ P difference at time t between the tank and the mold
- H L height of the liquid in the tank above the same reference as H M at the start of the cycle (time 0).
- pg specific mass of the liquid (2.4 g / cm 3 for Al, 1.6 g / cm 3 for Mg).
- ⁇ H C decrease in height of the liquid in the tank from time 0 to time t fi * geu v re 12.
- K t coefficient of friction at time t (instant coefficient)
- ⁇ 1 vertical speed of the liquid in the mold on the front which flows at dt time t. dH
- the computer will calculate the speed. It is the sensor 40 Fig. l and N ° l Fig. 12. A float moves with the liquid, it drives 2 toothed wheels 40 j and 40 2 (Fig. 1) and the axis of 40 2 is connected to a commercial type angle measurement sensor which gives the computer the angular position on the float with an accuracy of 1/10 of a degree. dP
- the computer calculates the values of ⁇ P and - - to be applied in the tank to have dH M H M and - - - taking into account these elements related to the position of the liquid. They can become predominant in the case of large mussels and represent more than 50% of the ⁇ P.
- the 2 conditions of the movement of the liquid indicated on page 10 lines 22-23 are related to the density of the liquid by the factor pg. We can therefore calculate the pressure and pressure velocity conditions to be applied in the tank at an instant t to obtain the position and speed of the liquid of density pg at this instant.
- the coefficient of friction by K 0 , and its instantaneous value K t will introduce a difference. They will be measured from the 1st filling test with metal or may be known from previous tests.
- the film recordings for the simulated aluminum flow will give the aluminum Reynolds numbers in the critical turbulence zones and it will be possible to predict what will be the movement of the denser liquid and of different viscosity in these zones.
- the visualization techniques are the same.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP97916484A EP0850117B1 (fr) | 1996-03-25 | 1997-03-24 | Procede et dispositif de simulation de remplissage de moules de fonderie |
DE69724924T DE69724924T2 (de) | 1996-03-25 | 1997-03-24 | Verfahren und vorrichtung zur simulation des füllvorganges von giessformen |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR96/03904 | 1996-03-25 | ||
FR9603904A FR2746335B1 (fr) | 1996-03-25 | 1996-03-25 | Procede de simulation de remplissage de moules, specialement en coulee pilotee sous vide et pression et dispositif pour sa mise en oeuvre |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1997035679A1 true WO1997035679A1 (fr) | 1997-10-02 |
Family
ID=9490672
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR1997/000515 WO1997035679A1 (fr) | 1996-03-25 | 1997-03-24 | Procede et dispositif de simulation de remplissage de moules de fonderie |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0850117B1 (fr) |
DE (1) | DE69724924T2 (fr) |
ES (1) | ES2207726T3 (fr) |
FR (1) | FR2746335B1 (fr) |
WO (1) | WO1997035679A1 (fr) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100682029B1 (ko) | 2005-09-07 | 2007-02-12 | 한국생산기술연구원 | 용탕충전 가시화 장치 |
CN101923600A (zh) * | 2010-09-29 | 2010-12-22 | 中冶南方工程技术有限公司 | 炼钢连铸车间的物流仿真方法 |
CN104001900A (zh) * | 2013-12-06 | 2014-08-27 | 哈尔滨东安发动机(集团)有限公司 | 多功能反重力铸造物理模拟装置 |
CN106424657A (zh) * | 2016-09-07 | 2017-02-22 | 上海华培动力科技有限公司 | 一种用于生产黑色金属铸件的调压铸造方法 |
CN110961617A (zh) * | 2019-11-07 | 2020-04-07 | 保定市立中车轮制造有限公司 | 一种铝液浇注模拟方法 |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103302242A (zh) * | 2013-06-18 | 2013-09-18 | 上海交通大学 | 航空发动机燃烧室浮动壁瓦片的精密铸造方法 |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6236536A (ja) * | 1985-08-09 | 1987-02-17 | Mazda Motor Corp | 鋳造用湯流れ試験液 |
EP0624413A1 (fr) * | 1993-05-10 | 1994-11-17 | Pierre Merrien | Procédé de coulée pilotée sous basse pression d'un moule sous vide pour alliages d'aluminium ou de magnésium et dispositif pour sa mise en oeuvre |
-
1996
- 1996-03-25 FR FR9603904A patent/FR2746335B1/fr not_active Expired - Fee Related
-
1997
- 1997-03-24 DE DE69724924T patent/DE69724924T2/de not_active Expired - Fee Related
- 1997-03-24 ES ES97916484T patent/ES2207726T3/es not_active Expired - Lifetime
- 1997-03-24 EP EP97916484A patent/EP0850117B1/fr not_active Expired - Lifetime
- 1997-03-24 WO PCT/FR1997/000515 patent/WO1997035679A1/fr active IP Right Grant
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6236536A (ja) * | 1985-08-09 | 1987-02-17 | Mazda Motor Corp | 鋳造用湯流れ試験液 |
EP0624413A1 (fr) * | 1993-05-10 | 1994-11-17 | Pierre Merrien | Procédé de coulée pilotée sous basse pression d'un moule sous vide pour alliages d'aluminium ou de magnésium et dispositif pour sa mise en oeuvre |
FR2705044A1 (fr) * | 1993-05-10 | 1994-11-18 | Merrien Pierre | Procédé de coulée pilotée sous basse pression d'un moule sous vide pour alliages d'aluminium ou de magnésium et dispositif pour sa mise en Óoeuvre. |
Non-Patent Citations (4)
Title |
---|
D. M. STEFANESCU ET AL.: "Metals Handbook,Ninth Edition, Vol.15, Casting", 1988, ASM, METALS PARK, OHIO, US, XP002020537 * |
DATABASE METADEX ASM/IOM, US; 1991, V.S. STAROVOITOV ET AL: "Study of Hydrodynamics of Casting Turnout Frog Cores by Elektroslag Permanent Mold Casting.", XP002020669 * |
PATENT ABSTRACTS OF JAPAN vol. 011, no. 219 (P - 596) 16 July 1987 (1987-07-16) * |
PROBLEMY SPETSIALVOY ELEKTROMETALLURGII, ISSN: 0233-7681, no. 3, 1989, KIEV,UA, pages 32 - 38 * |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100682029B1 (ko) | 2005-09-07 | 2007-02-12 | 한국생산기술연구원 | 용탕충전 가시화 장치 |
CN101923600A (zh) * | 2010-09-29 | 2010-12-22 | 中冶南方工程技术有限公司 | 炼钢连铸车间的物流仿真方法 |
CN104001900A (zh) * | 2013-12-06 | 2014-08-27 | 哈尔滨东安发动机(集团)有限公司 | 多功能反重力铸造物理模拟装置 |
CN104001900B (zh) * | 2013-12-06 | 2016-09-28 | 哈尔滨东安发动机(集团)有限公司 | 多功能反重力铸造物理模拟装置 |
CN106424657A (zh) * | 2016-09-07 | 2017-02-22 | 上海华培动力科技有限公司 | 一种用于生产黑色金属铸件的调压铸造方法 |
WO2018045809A1 (fr) * | 2016-09-07 | 2018-03-15 | 上海华培动力科技股份有限公司 | Procédé de coulée sous pression réglée pour la production d'un produit coulé de métal noir |
CN110961617A (zh) * | 2019-11-07 | 2020-04-07 | 保定市立中车轮制造有限公司 | 一种铝液浇注模拟方法 |
CN110961617B (zh) * | 2019-11-07 | 2021-12-07 | 保定市立中车轮制造有限公司 | 一种铝液浇注模拟方法 |
Also Published As
Publication number | Publication date |
---|---|
FR2746335A1 (fr) | 1997-09-26 |
FR2746335B1 (fr) | 1998-04-24 |
DE69724924T2 (de) | 2004-07-22 |
EP0850117A1 (fr) | 1998-07-01 |
DE69724924D1 (de) | 2003-10-23 |
ES2207726T3 (es) | 2004-06-01 |
EP0850117B1 (fr) | 2003-09-17 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP0624413B1 (fr) | Procédé de coulée pilotée sous basse pression d'un moule sous vide pour alliages d'aluminium ou de magnésium et dispositif pour sa mise en oeuvre | |
Layes et al. | Distortion of a spherical gaseous interface accelerated by a plane shock wave | |
EP0850117B1 (fr) | Procede et dispositif de simulation de remplissage de moules de fonderie | |
CN104001900B (zh) | 多功能反重力铸造物理模拟装置 | |
US3926664A (en) | Method for deaerating a circuit for the transport of liquids | |
Bull et al. | Surfactant spreading on thin viscous films: film thickness evolution and periodic wall stretch | |
JP2005273908A (ja) | 動圧軸受装置への潤滑液充填方法、充填装置、及び、注液方法 | |
Lv et al. | Stability and collapse of holes in liquid layers | |
CN107255607B (zh) | 一种粉尘迁移实验装置与方法 | |
CA1100280A (fr) | Procede et dispositif de moulage sous basse pression | |
CN212872083U (zh) | 一种液体表面张力系数及密度同步测量装置 | |
FR2460170A1 (fr) | Procede et dispositif d'automatisation d'un cycle de coulee sur machine basse-pression | |
EP0055947B1 (fr) | Procédé et dispositif d'automatisation d'un cycle de coulée du type à basse-pression | |
Szekely et al. | Studies in vacuum degassing: Mass and momentum transfer to gas bubbles rising in melts, the freeboard of which is evacuated | |
CN107680087B (zh) | 一种应用ct测量多孔介质内co2在盐水中的溶解速率的方法 | |
CN109520704A (zh) | 一种铸件充型模拟装置及方法 | |
CN116493195B (zh) | 一种在线式真空灌胶机及其控制方法 | |
EP0599750A1 (fr) | Procédé d'injection automatisée de gaz dans une installation multicoulée de métaux équipée de lingotières à rehaussé | |
Marfin et al. | Experimental study on viscous fingering in Hele-Shaw cell under acoustic impact | |
CN106568795A (zh) | 熔体测氢仪标定方法及装置 | |
CN115508889A (zh) | 基于波致气体溶解出溶机制的地震波衰减测量装置 | |
CA1182647A (fr) | Procede et dispositif d'automatisation d'un cycle de degazage sous vide d'alliages d'aluminium | |
JPH021760B2 (fr) | ||
Vladimirovna et al. | Experimental study on viscous fingering in Hele-Shaw cell under acoustic impact | |
FR2522139A1 (fr) | Procede et dispositif de mesure du volume d'un liquide dans un reservoir par resonance acoustique |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): CA JP US |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): AT BE CH DE DK ES FI FR GB GR IE IT LU MC NL PT SE |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
WWE | Wipo information: entry into national phase |
Ref document number: 1997916484 Country of ref document: EP |
|
WWP | Wipo information: published in national office |
Ref document number: 1997916484 Country of ref document: EP |
|
NENP | Non-entry into the national phase |
Ref country code: CA |
|
NENP | Non-entry into the national phase |
Ref country code: JP Ref document number: 97533832 Format of ref document f/p: F |
|
WWG | Wipo information: grant in national office |
Ref document number: 1997916484 Country of ref document: EP |