EP0252318A1 - Pressure type automatic pouring furnace for casting - Google Patents
Pressure type automatic pouring furnace for casting Download PDFInfo
- Publication number
- EP0252318A1 EP0252318A1 EP87108317A EP87108317A EP0252318A1 EP 0252318 A1 EP0252318 A1 EP 0252318A1 EP 87108317 A EP87108317 A EP 87108317A EP 87108317 A EP87108317 A EP 87108317A EP 0252318 A1 EP0252318 A1 EP 0252318A1
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- EP
- European Patent Office
- Prior art keywords
- molten metal
- type automatic
- pressure type
- automatic pouring
- chamber
- 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.)
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/10—Making spheroidal graphite cast-iron
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D39/00—Equipment for supplying molten metal in rations
- B22D39/06—Equipment for supplying molten metal in rations having means for controlling the amount of molten metal by controlling the pressure above the molten metal
Definitions
- the present invention relates generally to an automatic pouring furnace which receives a molten metal and pours into a caster automatically. More specifically, the invention relates to a pressure type automatic pouring furnace which pours a limited amount of molten metal in the furnace by applying a gas pressure.
- automatic pouring furnaces become popular as replacements for manual pouring by means of ladle.
- the automatic pouring furnaces take various systems for pouring the molten metal within the furnaces to casters.
- pressure type, inclination type, electromagnetic pump type furnaces are available.
- the pressure type pouring furnaces are known as advantageous in view of pouring accuracy and comsumption of electricity.
- the pressure type automatic pouring furnace for casting comprises a sealingly enclosed molten metal chamber, a molten metal inlet and outlet extending upwardly from portion of the moltent metal chamber in the vicnity of the bottom of the chamber, and a groove type induction heater section communicated with the lower section of the molten metal chamber for heating the molten metal in the chamber.
- a given base pressure P is introduced into the molten metal chamber for pre-leveling of the molten metal.
- additional shot pressure ⁇ P is introduced into the molten metal chamber for pouring the molten metal to the caster with a given speed which can be controlled by adjusting the magnitude of the shot pressure.
- the pressure type automatic pouring furnace of the type set forth above is applicable for continuous casting by supplying molten metal continuously or with a given intervals.
- the conventional pressure type automatic pouring furnace encounters a disadvantage that it requires the molten metal in the molten metal chamber at a level not lower than a minimum level.
- the minimum level of the molten metal is determined according to the level of the molten metal outlet opening to the molten metal chamber.
- 30% to 50% to the maximum molten metal amount is required to be maintained within the molten metal chamber.
- Maintaining more than minimum amount of molten metal to keep the molten metal level higher than the minimum level requires removal of the molten metal in the chamber when the composition of the metal or alloy to use for casting is to be changed. This significantly lowers the yield in casting operation. Especially, when such automatic pouring furnace is used for a casting line in which relatively large number of mutually different alloys are used for casting.
- Another object of the invention is to provide a pressure type automatic pouring furnace for casting, which successfully avoid possibility of escaping of the pressurized gas from the molten metal chamber.
- a further object of the invention is to provide a pressure type automatic pouring furnace which has a better pressuirization characteristics than that of the conventional furnaces.
- a pressure type automatic pouring fuance in accordance with the present invention, is formed with a molten metal outlet which has an opening end opening at lower elevation than the general portion of the floor of a molten metal chamber.
- the molten metal chamber is communicated with a groove type induction heater section at a lower section thereof so that the molten metal in the chamber can be effectively heated.
- the bottom wall of the molten metal outlet is to be declined for a given angle, e.g. 3° toward the heating section with respect to the horizontal plane so as to prevent the molten metal from accumulating within the outlet.
- a pressure type automatic pouring furnace for casting comprises a furnace body defined a chamber for receiving a molten metal, a molten metal inlet defined through a furnace wall and having a first opening opened substantially at the bottom of the chamber, a molten metal outlet defined through the furnace wall and having a second opening exposed to the chamber and located at an elevation lower than the first opening, and a pressure means for introducing a pressure in the chamber for forcing the molten metal within the chamber to the molten metal outlet.
- the molten metal inlet and outlet are located radially opposite positions.
- the furnace body has a floor forming the bottom of the chamber, the floor being formed with a stepped down section opposing to the second opening of the molten metal outlet.
- the second opening has the uppermost section oriented at an elevation substantially corresponding to the general section of the upper surface of the floor.
- the floor is slanted from the side where the molten metal inlet is formed to the side where the stepped down section is formed.
- the pressure type automatic pouring furnace further comprises a groove defined in the floor and communicated with the stepped down section, the groove being communicated with a heating means for heating the molten metal.
- the groove is is provided a slant angle greater than or equal to 3° with respect to a horizontal plane.
- the heating means is a groove type induction heating device comprising an electric heater and means defining molten metal path sorrounding the heater and communicated with the groove.
- the molten metal path defined in the groove type induction heating device is oriented at an elevation lower than the joining section of the groove.
- the pressure type pouring furnace further comprises a heating means provided beneath the chamber and communicated with the bottom of the chamber.
- the heating means is a groove type induction heating device comprising an electric heater and means defining molten metal path sorrounding the heater and communicated with the bottom of the chamber. The molten metal path defined in the groove type induction heating device opens to the bottom of the chamber.
- the pressure means comprises a pressure inlet defined above the chamber for introducing a pressurized gas into the chamber.
- the pressure type automatic pouring furnace further comprises an auxiliary pressure means associated with the molten metal inlet for introducing a pressurized gas into the chamber through the molten metal inlet.
- the preferred embodiment of a pressure type automatic pouring furnace has a furnace body 10 defining therein a molten metal chamber 12 by side wall 14 and floor 16.
- a molten metal inlet path 18 is defined through the side wall 14.
- the inlet path 18 opens to the molten metal chamber 12 at the inner end thereof.
- the inner end opening 20 of the inlet path 18 have the lowermost elevation corresponding to the elevation of the upper surface of the floor 16 of the molten metal chamber 12.
- the inlet path 18 extends upwardly through the side wall 14 of the furnace with a given inclination angle.
- a closure 22 is provided for sealingly closing the outer end opening 24 of the inlet path 18 in air-tight fashion.
- a molten metal outlet path 26 is also defined through the side wall 14 of the furnace 10.
- the outlet path 26 has an inner end 28 opening to the molten metal chamber 12.
- the outer end 30 of the outlet path 26 communicates with an outlet nozzle 32 in order to pour the molten metal to a caster or casting molding (not shown) therethrough.
- the inner end 28 of the outlet path 26 has the lowermost elevation lower than that of the general upper surface of the floor 16.
- the uppermost section of the inner end 28 of the outlet path 26 is positioned at an elevation substantially corresponding to the elevation of the upper surface of the floor 16.
- a stepped down section 34 is formed on the floor 16 in communication with the inner end 28 of the outlet path 26.
- the inlet path 18 and the outlet path 26 are located at opposite sides of the furnace 10.
- the upper surface of the floor 16 is slanted toward stepped down section 34, as indicated by the arrow ⁇ in Fig. 2.
- the stepped down section 34 extends in circumferential direction with a slant angle in a direction ⁇ .
- the slant angle in ⁇ direction in the preferred embodiment, is greater than 3°.
- a groove type induction heater section 36 is provided with the furnace 10.
- the heater section 36 has an essentially circular molten metal path 38 sorrounding an induction heating device 40, which circular molten metal path is in communication with the lowermost portion of the stepped down section 34 of the floor 16.
- the upper end of the molten metal chamber 12 is opened and openably closed by means of a closure lid 42.
- the closure lid 42 sealingly closes the opened upper end of the molten metal chamber 12 in air-tight fashion.
- the closure lid 42 is provided with a communication path (not shown) to introduce therethrough a pressurized gas.
- the closure 22 closing the outer end of the inlet path 18 may also have a path for introducing therethrough a pressurized gas. Providing the pressurized gas inlet for the closure 22 should be advantageous to effectively pressurize the molten metal chamber 12 and whereby force the molten metal in the molten metal chamber to the outlet path.
- the minimum level of the molten metal required is shown in Fig. 4(A).
- an comparative example is shown in Fig. 4(B).
- the required amount of the molten metal is to fill only the stepped down section 34. This clearly smaller than that in the conventional furnace.
- the effective volume of the molten metal chamber 12 in the furnaces of Figs. 4(A) and 4(B) are the same, e.g. 5.0t, the minimum amount of the molten metal in the inventive furnace of Fig.
- the molten metal level has to be higher than or equal to the uppermost section of the inlet and outlet paths 18 and 26. Since the molten metal chamber 12 is pressurized, the volume of the molten metal should include amounts to fill the inlet and outlet path for maintaining the motlen metal level higher than or equal to the uppermost section of the inner end openings of the inlet and outlet path. Consequently, for the shown example, minimum volume of the molten metal to be required will be 2.7t. In this case, the overall required amout of the molten metal becomes 7.7t.
- the required minimum amount of the molten metal to be filled in the molten metal chamber become approximately half of that required in the conventional furnace.
- the induction heating section 36 since the induction heating section 36 is communicated with the stepped down section 34 at the lowermost elevation, heat distribution of the molten metal in the molten metal chamber can be successfully maintained so as to prevent the molten metal from solidifying at the stepped down section 34 opposing the inner end opening 28 of the outlet path 26. That is, as is well known the groove type induction heating device 40 may not have substantial stirring ability. Therefore, heat transmission from the induction heating device to the molten metal in the molten metal chamber 12 generaaly relies on natual convection. This means that the lower temperature molten metal will accumulate at the lower section in the chamber due to difference of the density. If the portion of the stepped down section 34 opposing the inner end opening 28 of the outlet path 26 is located at the lowermost elevation, the lowest temperature part of the molten metal in the molten metal chamber 12 will be accumulated in that portion of the stepped down section.
- the stepped down section 34 is slanted toward the portion joining with the induction heating section 36, the lowest temperature molten metal flows to the joining section to be introduced into the induction heating system 36 which is located at further lower elevation that that of the joining section. This allows effective heating of the molten metal in the molten metal chamber 12 and thus prevents the molten metal from solidifying in the outlet path during pouring to the caster.
- additional advantage may be expected that, since the required molten metal mount for maintaining the minimum level is substantially reduced, an electricity required for the induction heating device 40 for heating the molten metal can be reduced correspondingly.
- the amount of the molten metal to be removed becomes substantial ly reduced in comparison with that of the conventional furnace of Fig. 4(B), even when the composition of the metal to be casted was substantially different. This make easier to cast various compositions of metals to be casted by means of the common pouring furnace.
- the appended table 2 shows average consumed electricities through 3 months while the molten metal has been maintained within the furnace. As will be seen from the table 2, according to the shown embodiment, the consumed electricity can be saved at 10 Kw in comparison with that in the conventional and comparative example of Fig.4(B).
- Figs. 6, 7 and 8 show another embodiment of the pressure type automatic pouring furnace accroding to the invention.
- the corresponding sections and components common to the foregoing embodiment of Figs. 1 through 3 will be represented by the same reference numerals and thus neglected the detailed discussion in order to avoid redundancy of discussion and to avoid confusion.
- the groove type induction heating section 30 is provided beneath the molten metal chamber 12 in the furnace 10.
- the circular molten metal path 38 communicates with a communication path 52 formed through the bottom of the molten metal chamber 12 directly.
- the inner end opening 28 of the outlet path 26 is directed to oppose one end of the molten metal path 38 in the induction heating section. Therefore, the molten metal to be introduced into the outlet path 26 may be the one heated by the induction heating section. This may successfully prevent the molten metal in the outlet path from solidifying.
- the minimum level of the molten metal in the molten metal is that represented by the phantom line 50. Therefore, the minimum amount of the molten metal to maintain the minimum level 50 may be substantially reduced in comparision with that required in the conventional furnace.
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- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
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Abstract
Description
- The present invention relates generally to an automatic pouring furnace which receives a molten metal and pours into a caster automatically. More specifically, the invention relates to a pressure type automatic pouring furnace which pours a limited amount of molten metal in the furnace by applying a gas pressure.
- In the recent years, automatic pouring furnaces become popular as replacements for manual pouring by means of ladle. The automatic pouring furnaces take various systems for pouring the molten metal within the furnaces to casters. For example, pressure type, inclination type, electromagnetic pump type furnaces are available. Among such various pouring furnaces, the pressure type pouring furnaces are known as advantageous in view of pouring accuracy and comsumption of electricity. The advantages of the pressure type automatic pouring furnaces have been confirmed in 'Fuji Review (Fuji Jiho)' 52, published on 1979, page 619 'Mitsubishi Electric Technical Report (Mitsubishi Denki Giho)' 53, published on 1979, page 652, 'Mitsubishi Electric Technical Report (Mitsubishi Denki Giho)' 52, published on 1978, page 450.
- In the typical construction, the pressure type automatic pouring furnace for casting comprises a sealingly enclosed molten metal chamber, a molten metal inlet and outlet extending upwardly from portion of the moltent metal chamber in the vicnity of the bottom of the chamber, and a groove type induction heater section communicated with the lower section of the molten metal chamber for heating the molten metal in the chamber. Upon pouring, a given base pressure P is introduced into the molten metal chamber for pre-leveling of the molten metal. Thereafter, additional shot pressure ΔP is introduced into the molten metal chamber for pouring the molten metal to the caster with a given speed which can be controlled by adjusting the magnitude of the shot pressure. Such construction of the pressure type automatic pouring furnace has been disclosed in the Japenese Patent First (unexamined) Publication No. 53-33929.
- The pressure type automatic pouring furnace of the type set forth above is applicable for continuous casting by supplying molten metal continuously or with a given intervals.
- The conventional pressure type automatic pouring furnace encounters a disadvantage that it requires the molten metal in the molten metal chamber at a level not lower than a minimum level. The minimum level of the molten metal is determined according to the level of the molten metal outlet opening to the molten metal chamber. In practice, in order to maintain the molten metal level higher than the minumum level, usually 30% to 50% to the maximum molten metal amount is required to be maintained within the molten metal chamber. When the molten metal in the chamber becomes lower than the minimum level, possibility increases to allow the pressurized gas in the chamber to escape through the outlet. Maintaining more than minimum amount of molten metal to keep the molten metal level higher than the minimum level, requires removal of the molten metal in the chamber when the composition of the metal or alloy to use for casting is to be changed. This significantly lowers the yield in casting operation. Especially, when such automatic pouring furnace is used for a casting line in which relatively large number of mutually different alloys are used for casting.
- Therefore, it is an object of the present invention to provide a pressure type automatic pouring furnace which can minimize required molten metal amount to be maintained in a molten metal chamber.
- Another object of the invention is to provide a pressure type automatic pouring furnace for casting, which successfully avoid possibility of escaping of the pressurized gas from the molten metal chamber.
- A further object of the invention is to provide a pressure type automatic pouring furnace which has a better pressuirization characteristics than that of the conventional furnaces.
- In order to accomplish the aforementioned and other objects, a pressure type automatic pouring fuance, in accordance with the present invention, is formed with a molten metal outlet which has an opening end opening at lower elevation than the general portion of the floor of a molten metal chamber.
- Preferably, the molten metal chamber is communicated with a groove type induction heater section at a lower section thereof so that the molten metal in the chamber can be effectively heated. In addition, the bottom wall of the molten metal outlet is to be declined for a given angle, e.g. 3° toward the heating section with respect to the horizontal plane so as to prevent the molten metal from accumulating within the outlet.
- According to one aspect of the invention, a pressure type automatic pouring furnace for casting, comprises a furnace body defined a chamber for receiving a molten metal, a molten metal inlet defined through a furnace wall and having a first opening opened substantially at the bottom of the chamber, a molten metal outlet defined through the furnace wall and having a second opening exposed to the chamber and located at an elevation lower than the first opening, and a pressure means for introducing a pressure in the chamber for forcing the molten metal within the chamber to the molten metal outlet.
- In the practical construction, the molten metal inlet and outlet are located radially opposite positions. Further practically, the furnace body has a floor forming the bottom of the chamber, the floor being formed with a stepped down section opposing to the second opening of the molten metal outlet. The second opening has the uppermost section oriented at an elevation substantially corresponding to the general section of the upper surface of the floor. By setting the uppermost section of the second opening at the level corresponding to the upper surface of the general portion of the floor, a required minimum level of the molten metal in the chamber becomes the level of the uppermost section. This substantially reduces the required minimum amount of the molten metal in the chamber.
- In the further preferred construction, the floor is slanted from the side where the molten metal inlet is formed to the side where the stepped down section is formed. The pressure type automatic pouring furnace further comprises a groove defined in the floor and communicated with the stepped down section, the groove being communicated with a heating means for heating the molten metal. Preferably, the groove is is provided a slant angle greater than or equal to 3° with respect to a horizontal plane.
- In practical embodiment, the heating means is a groove type induction heating device comprising an electric heater and means defining molten metal path sorrounding the heater and communicated with the groove. The molten metal path defined in the groove type induction heating device is oriented at an elevation lower than the joining section of the groove.
- In the alternative embodiment, the pressure type pouring furnace further comprises a heating means provided beneath the chamber and communicated with the bottom of the chamber. Similarly to the former case, the heating means is a groove type induction heating device comprising an electric heater and means defining molten metal path sorrounding the heater and communicated with the bottom of the chamber. The molten metal path defined in the groove type induction heating device opens to the bottom of the chamber.
- In the further alternative embodiment, the pressure means comprises a pressure inlet defined above the chamber for introducing a pressurized gas into the chamber. The pressure type automatic pouring furnace further comprises an auxiliary pressure means associated with the molten metal inlet for introducing a pressurized gas into the chamber through the molten metal inlet.
- The present invention will be understood more fully from the detailed description given herebelow and from the accompanying drawings of the preferred embodiment of the invention, which, however, should not be taken to limit the invention to the specific embodiments, but are for explanation and understanding only.
- In the drawings:
- Fig. 1 is a cross-section of the preferred embodiment of a pressure type automatic pouring furnace according to the present invention;
- Fig. 2 is a section taken along line II-II of Fig. 1;
- Fig. 3 is a section taken along line III-III of Fig. 2;
- Figs. 4 (A) and 4(B) are sections of the inventive furnace and conventional furnace, which sections are used for comparing required minimum molten metal amount in the present invention and the prior art;
- Fig. 5 is a graph showing molten metal temperatures in the outlet of the furnace;
- Fig. 6 is a cross-section of another preferred embodiment of a pressure type automatic pouring furnace according to the invention;
- Fig. 7 is a section taken along line VII - VII of Fig. 6;
- Fig. 8 is a section taken along line VIII - VIII of Fig. 7.
- Referring now to the drawings, particularly to Figs. 1 through 3, the preferred embodiment of a pressure type automatic pouring furnace, according to the present invention, has a
furnace body 10 defining therein amolten metal chamber 12 byside wall 14 andfloor 16. A moltenmetal inlet path 18 is defined through theside wall 14. Theinlet path 18 opens to themolten metal chamber 12 at the inner end thereof. The inner end opening 20 of theinlet path 18 have the lowermost elevation corresponding to the elevation of the upper surface of thefloor 16 of themolten metal chamber 12. - The
inlet path 18 extends upwardly through theside wall 14 of the furnace with a given inclination angle. Aclosure 22 is provided for sealingly closing the outer end opening 24 of theinlet path 18 in air-tight fashion. - A molten
metal outlet path 26 is also defined through theside wall 14 of thefurnace 10. Theoutlet path 26 has aninner end 28 opening to themolten metal chamber 12. Theouter end 30 of theoutlet path 26 communicates with anoutlet nozzle 32 in order to pour the molten metal to a caster or casting molding (not shown) therethrough. As seen from Fig. 1, theinner end 28 of theoutlet path 26 has the lowermost elevation lower than that of the general upper surface of thefloor 16. In the preferred arrangement, the uppermost section of theinner end 28 of theoutlet path 26 is positioned at an elevation substantially corresponding to the elevation of the upper surface of thefloor 16. In order to establish communication between themolten metal chamber 12 and theoutlet path 26, a stepped downsection 34 is formed on thefloor 16 in communication with theinner end 28 of theoutlet path 26. - As clearly seen from Fig. 1, the
inlet path 18 and theoutlet path 26 are located at opposite sides of thefurnace 10. The upper surface of thefloor 16 is slanted toward stepped downsection 34, as indicated by the arrow α in Fig. 2. - As shown in Fig. 2. the stepped down
section 34 extends in circumferential direction with a slant angle in a direction β. The slant angle in β direction, in the preferred embodiment, is greater than 3°. A groove typeinduction heater section 36 is provided with thefurnace 10. Theheater section 36 has an essentially circularmolten metal path 38 sorrounding aninduction heating device 40, which circular molten metal path is in communication with the lowermost portion of the stepped downsection 34 of thefloor 16. - The upper end of the
molten metal chamber 12 is opened and openably closed by means of aclosure lid 42. Theclosure lid 42 sealingly closes the opened upper end of themolten metal chamber 12 in air-tight fashion. Theclosure lid 42 is provided with a communication path (not shown) to introduce therethrough a pressurized gas. Also, if desired, theclosure 22 closing the outer end of theinlet path 18 may also have a path for introducing therethrough a pressurized gas. Providing the pressurized gas inlet for theclosure 22 should be advantageous to effectively pressurize themolten metal chamber 12 and whereby force the molten metal in the molten metal chamber to the outlet path. - It should be noted that construction of the system for introducing the pressurized gas into the
molten metal chamber 12 and control of the pressure for controlling the pouring speed has been disclosed in the Japanese Patent First (unexamined) Publication (Tokkai) Showa 53-33929, published on March 40, 1978, for example. The disclosure of the Tokkai 53-33929 is herein incorporated by reference for the sake of disclosure. - In the shown embodiment, the minimum level of the molten metal required is shown in Fig. 4(A). In order to compare the required minimum level of the molten metal in the conventional pouring furnace, an comparative example is shown in Fig. 4(B). As will be seen from Fig. 4(A), because of the presence of the stepped down
section 34 on thefloor 16 of themolten metal chamber 12, the required amount of the molten metal is to fill only the stepped downsection 34. This clearly smaller than that in the conventional furnace. Assuming the effective volume of themolten metal chamber 12 in the furnaces of Figs. 4(A) and 4(B) are the same, e.g. 5.0t, the minimum amount of the molten metal in the inventive furnace of Fig. 4(B) will be 1.4t to fill theoutlet path 26 and the stepped downsection 34. Therefore, in this case, the overall required amount of the molten metal becomes 6.4t. On the other hand, in order to maintain the conventional furnace of Fig. 4(B), the molten metal level has to be higher than or equal to the uppermost section of the inlet andoutlet paths molten metal chamber 12 is pressurized, the volume of the molten metal should include amounts to fill the inlet and outlet path for maintaining the motlen metal level higher than or equal to the uppermost section of the inner end openings of the inlet and outlet path. Consequently, for the shown example, minimum volume of the molten metal to be required will be 2.7t. In this case, the overall required amout of the molten metal becomes 7.7t. - Therefore, with the shown construction of the pressure type automatic pouring furnace according to the present invention, the required minimum amount of the molten metal to be filled in the molten metal chamber become approximately half of that required in the conventional furnace.
- In addition, according to the shown embodiment, since the
induction heating section 36 is communicated with the stepped downsection 34 at the lowermost elevation, heat distribution of the molten metal in the molten metal chamber can be successfully maintained so as to prevent the molten metal from solidifying at the stepped downsection 34 opposing the inner end opening 28 of theoutlet path 26. That is, as is well known the groove typeinduction heating device 40 may not have substantial stirring ability. Therefore, heat transmission from the induction heating device to the molten metal in themolten metal chamber 12 generaaly relies on natual convection. This means that the lower temperature molten metal will accumulate at the lower section in the chamber due to difference of the density. If the portion of the stepped downsection 34 opposing the inner end opening 28 of theoutlet path 26 is located at the lowermost elevation, the lowest temperature part of the molten metal in themolten metal chamber 12 will be accumulated in that portion of the stepped down section. - According to the present invention, since the stepped down
section 34 is slanted toward the portion joining with theinduction heating section 36, the lowest temperature molten metal flows to the joining section to be introduced into theinduction heating system 36 which is located at further lower elevation that that of the joining section. This allows effective heating of the molten metal in themolten metal chamber 12 and thus prevents the molten metal from solidifying in the outlet path during pouring to the caster. - In order to determine the slant angle of the stepped down section, experimentation has been performed to measure the temperature of the molten metal in the outlet path when the average temperature of the molten metal in the
molten metal chamber 12 is maintained at 1600°C. The result has been shown in Fig. 5. As will be seen from Fig. 5, when the slant angle in the direction β is greater than or equal to 3°, remarkable improvement could be observed. Therefore, by providing the slant angle greater than or euqal to 3° with respect to the horizontal plane, the temperature of the molten metal in theoutlet path 26 can be maintained satisfactorily high to successfully prevent solidification of the molten metal in the outlet path. - According to the shown embodiment, additional advantage may be expected that, since the required molten metal mount for maintaining the minimum level is substantially reduced, an electricity required for the
induction heating device 40 for heating the molten metal can be reduced correspondingly. - In order to demonstrate the advantages of the shown embodiment of the furnace in comparison with the conventional furnace, an experimentation has been performed utilizing the furnaces of Figs. 4(A) and 4(B). In the experimentation, pouring of SUS 430, SUS 308 and Incoroy 800 are performed in order. At first, 5.0t of SUS 430 is poured to a corresponding caster for casting 5t of ingot. Then, 2t of SUS 308 ingot is casted by pouring molten SUS 308 by means of the furnaces of Figs. 4(A) and 4(B). Finally, 2t of Incoroy 800 ingot is casted by pouring the molten Incoroy 800 by means of the furnaces of Figs. 4(A) and 4(B). Method for supplying additional melt and yields of Ni, Cr and Fe are shown in the appended table 1.
- In the aforementioned sequence of pouring and casting process, upon supplying additional melt at the transition between casting of SUS 430 and casting SUS 308, the Cr and Ni amount required in the inventive furnace of Fig. 4(A) was much smaller than that required in the conventional furnace of Fig. 4(B). On the other hand, in the transistion between casting of the SUS 308 and casting of Incoroy 800, the moltem metal in the molten metal chamber, which was used for casting of SUS 308 was removed by inclining the furnaces. At this time, removed amount of the melt was 0.2t in the inventive furnace of Fig. 4(A). In comparison with this, the removed amount of the melt in the conventional furnace was 1.0t. This indicates that by utilizing the inventive furnace of Fig. 4(A), the amount of the molten metal to be removed becomes substantial ly reduced in comparison with that of the conventional furnace of Fig. 4(B), even when the composition of the metal to be casted was substantially different. This make easier to cast various compositions of metals to be casted by means of the common pouring furnace.
- The appended table 2 shows average consumed electricities through 3 months while the molten metal has been maintained within the furnace. As will be seen from the table 2, according to the shown embodiment, the consumed electricity can be saved at 10 Kw in comparison with that in the conventional and comparative example of Fig.4(B).
- Figs. 6, 7 and 8 show another embodiment of the pressure type automatic pouring furnace accroding to the invention. In this embodiment, the corresponding sections and components common to the foregoing embodiment of Figs. 1 through 3 will be represented by the same reference numerals and thus neglected the detailed discussion in order to avoid redundancy of discussion and to avoid confusion.
- In this embodiment, the groove type
induction heating section 30 is provided beneath themolten metal chamber 12 in thefurnace 10. The circularmolten metal path 38 communicates with acommunication path 52 formed through the bottom of themolten metal chamber 12 directly. The inner end opening 28 of theoutlet path 26 is directed to oppose one end of themolten metal path 38 in the induction heating section. Therefore, the molten metal to be introduced into theoutlet path 26 may be the one heated by the induction heating section. This may successfully prevent the molten metal in the outlet path from solidifying. - Even in this case, the minimum level of the molten metal in the molten metal is that represented by the
phantom line 50. Therefore, the minimum amount of the molten metal to maintain theminimum level 50 may be substantially reduced in comparision with that required in the conventional furnace. - While the present invention has been disclosed in terms of the preferred embodiment in order to facilitate better understanding of the invention, it should be appreciated that the invention can be embodied in various ways without departing from the principle of the invention. Therefore, the invention should be understood to include all possible embodiments and modifications to the shown embodiments which can be embodied without departing from the principle of the invention set out in the appended claims.
Claims (27)
a furnace body defined a chamber for receiving a molten metal;
a molten metal inlet defined through a furnace wall and having a first opening opened substantially at the bottom of said chamber;
a molten metal outlet defined through said furnace wall and having a second opening exposed to said chamber and located at an elevation lower than said first opening; and
a pressure means for introducing a pressure in said chamber for forcing the molten metal within said chamber to said molten metal outlet.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP131918/86 | 1986-06-09 | ||
JP13191886A JPS62289363A (en) | 1986-06-09 | 1986-06-09 | Pressurization type pouring furnace |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0252318A1 true EP0252318A1 (en) | 1988-01-13 |
EP0252318B1 EP0252318B1 (en) | 1990-06-06 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP19870108317 Expired EP0252318B1 (en) | 1986-06-09 | 1987-06-09 | Pressure type automatic pouring furnace for casting |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0252318B1 (en) |
JP (1) | JPS62289363A (en) |
DE (1) | DE3763016D1 (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AT404328B (en) * | 1995-03-24 | 1998-10-27 | Rauch Fertigungstech Gmbh | METHOD AND DEVICE FOR LOADING CASTING MACHINES |
EP0916435A1 (en) * | 1997-11-18 | 1999-05-19 | Fundacion Inasmet | Casting furnace for automatic molding |
ES2143341A1 (en) * | 1996-05-06 | 2000-05-01 | Fundacion Inasmet | Casting furnace for improved automatic moulding |
WO2001098004A1 (en) * | 2000-06-22 | 2001-12-27 | Hoei Shokai Co., Ltd | Molten metal feeding method, molten metal feeding system, molten aluminum producing method, aluminum die-cast product producing method, car manufacturing method, transportation vehicle, container, and molten metal feeding device |
GB2388564B (en) * | 2000-12-27 | 2005-07-13 | Hoei Shokai Co Ltd | Container |
EP1649952A1 (en) * | 2003-07-25 | 2006-04-26 | Nippon Crucible Co., Ltd. | Molten metal transportating ladle and method of tapping molten metal |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0661610B2 (en) * | 1989-05-30 | 1994-08-17 | 富士電機株式会社 | Pressurized pouring furnace |
JPH051085U (en) * | 1991-06-21 | 1993-01-08 | 株式会社ニフコ | Mounting holder |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH474302A (en) * | 1966-04-22 | 1969-06-30 | Ct De Rech S De Pont A Mousson | Liquid pouring installation |
BE887917A (en) * | 1980-03-13 | 1981-07-01 | Fischer Ag Georg | PROCESS FOR CASTING A METAL MOLTEN MASS UNDER THE PRESSURE OF A PROTECTIVE GAS |
-
1986
- 1986-06-09 JP JP13191886A patent/JPS62289363A/en active Granted
-
1987
- 1987-06-09 EP EP19870108317 patent/EP0252318B1/en not_active Expired
- 1987-06-09 DE DE8787108317T patent/DE3763016D1/en not_active Expired - Fee Related
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH474302A (en) * | 1966-04-22 | 1969-06-30 | Ct De Rech S De Pont A Mousson | Liquid pouring installation |
BE887917A (en) * | 1980-03-13 | 1981-07-01 | Fischer Ag Georg | PROCESS FOR CASTING A METAL MOLTEN MASS UNDER THE PRESSURE OF A PROTECTIVE GAS |
Non-Patent Citations (1)
Title |
---|
GIESSEREI, vol. 70, no. 9, 2nd May 1983, pages 268-274, Düsseldorf, DE; M. OGRISSEK: "Giesseinrichtungen für Gusseisen - bestehende und neue Steuersysteme und deren Anwendung" * |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AT404328B (en) * | 1995-03-24 | 1998-10-27 | Rauch Fertigungstech Gmbh | METHOD AND DEVICE FOR LOADING CASTING MACHINES |
US5908066A (en) * | 1995-03-24 | 1999-06-01 | Ing. Rauch Fertigungstechnik Gesellschaft M.B.H. | Process and device for charging foundry machines |
ES2143341A1 (en) * | 1996-05-06 | 2000-05-01 | Fundacion Inasmet | Casting furnace for improved automatic moulding |
EP0916435A1 (en) * | 1997-11-18 | 1999-05-19 | Fundacion Inasmet | Casting furnace for automatic molding |
WO2001098004A1 (en) * | 2000-06-22 | 2001-12-27 | Hoei Shokai Co., Ltd | Molten metal feeding method, molten metal feeding system, molten aluminum producing method, aluminum die-cast product producing method, car manufacturing method, transportation vehicle, container, and molten metal feeding device |
US7396504B2 (en) | 2000-06-22 | 2008-07-08 | Hoei Shokai Co., Ltd. | Method for supplying molten metal, system for supplying molten metal, producing method for producing aluminum, producing method for producing aluminum molding product, producing method of automobile, transporting vehicle, container, and apparatus for supplying molten metal |
GB2388564B (en) * | 2000-12-27 | 2005-07-13 | Hoei Shokai Co Ltd | Container |
US7204954B2 (en) | 2000-12-27 | 2007-04-17 | Hoei Shokai Co., Ltd. | Container |
EP1649952A1 (en) * | 2003-07-25 | 2006-04-26 | Nippon Crucible Co., Ltd. | Molten metal transportating ladle and method of tapping molten metal |
EP1649952A4 (en) * | 2003-07-25 | 2010-07-14 | Nippon Crucible Co | Molten metal transportating ladle and method of tapping molten metal |
Also Published As
Publication number | Publication date |
---|---|
EP0252318B1 (en) | 1990-06-06 |
JPH0224184B2 (en) | 1990-05-28 |
DE3763016D1 (en) | 1990-07-12 |
JPS62289363A (en) | 1987-12-16 |
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