[Problem] To efficiently heat a molten metal MM and inhibit the generation of a metal oxide and the discharge of hydrogen gas bubbles, when holding the molten metal MM in a molten metal-holding furnace 1. [Solution] A molten metal holding furnace 1 that solves the problem comprises: a holding chamber 13 that houses a molten metal MM and maintains the temperature of the molten metal MM; a molten metal-receiving chamber 11; and a molten metal-discharging chamber 16. An elongated molten metal-heating body 2 that heats the molten metal MM is provided in the holding chamber 13. The molten metal-heating body 2 is provided extending downward DS from a side wall section 13Ds of the holding chamber 13. The bottom surface 13Db1 of the holding chamber 13 positioned downward DS of the molten metal-heating body 2 is inclined in the same direction as the molten metal-heating body 2 while being spaced apart from the molten metal-heating body 2 by a prescribed interval.
[Problem] To reduce a melting time when a metal material is melted in a molten metal. [Solution] In order to solve the above-described problem, a metal melting furnace 1 includes: a metal melting chamber 13 that accommodates a molten metal MM and that performs at least one of melting a metal material in a liquid of the flowing molten metal MM and raising the temperature of the molten metal MM; and an elongated molten metal heating body 2 for heating the molten metal MM, in the metal melting chamber 13. The molten metal heating body 2 is provided so as to extend from a side wall section 13Ds of the metal melting chamber 13 toward a downside DS. A bottom surface 13Db1 of the metal melting chamber 13 that is located at the downside DS of the molten metal heating body 2 is inclined in the same direction as that of the molten metal heating body 2, while leaving a predetermined space with respect to the molten metal heating body 2.
22 emission. [Solution] A heater unit 30 comprises: an outgoing heating wire which extends from a base end side toward a tip side; a return heating wire which is connected to the outgoing heating wire and returns from the tip side to the base end side; and multiple heater insulators 41 which are disposed at intervals in a longitudinal direction of the heater unit 30. The heater unit 30 has outer heating wires 42A and inner heating wires 42B which are positioned on the outer side and on the inner side, respectively, in a radial direction with respect to the center, wherein the outer heating wires 42A have a smaller outside diameter than the outside diameter of the inner heating wires 42B.
A molten metal furnace in which molten metal leakage may be avoided or controlled and heat radiation from the furnace body may be controlled. The molten metal furnace has an outer wall on its outer periphery, a molten metal storage part for holding a molten metal therein, and an inner wall forming the molten metal storage part and having a plurality of lining layers, wherein a first lining layer of the plurality of lining layers, having a surface to be in contact with the molten metal, is formed of a refractory material, wherein a sealing material is provided along at least two boundaries present in a range between the first lining layer and the outer wall, and wherein a lining layer sandwiched between layers of the sealing material is formed of a thermal insulation board containing at least silicon dioxide (SiO2).
A molten metal mixing system capable of controlling generation of oxides in mixing of molten metals to. The system includes 1st/2nd apparatus for melting 1st/2nd raw materials into 1st/2nd molten metals, and a pipe connecting the 1st and 2nd apparatus. The 2nd molten metal produced in the 2nd apparatus is transferred through the pipe to the 1st apparatus to mix with the 1st raw material and/or the 1st molten metal. The 2nd apparatus has a tapping chamber for retaining the 2nd molten metal to be transferred to the 1st apparatus. The 1st apparatus has a receiving chamber for retaining the 2nd molten metal transferred from the 2nd apparatus. When part of the 2nd molten metal is discharged out of the receiving chamber to lower the surface of the molten metal, the 2nd molten metal in the tapping chamber is transferred through the pipe into the receiving chamber by siphon principle.
A molten metal furnace capable of preventing or suppressing the molten metal leakage and controlling the leakage direction. A molten metal furnace including an outer wall in an outer peripheral portion and a molten metal storage part holding a molten metal, in which a plurality of lining material layers are arranged on an inner wall of the molten metal furnace forming the molten metal storage part; of the lining material layers, a first lining layer constituting a surface in contact with the molten metal is made of a refractory material; and a sealing material is provided on at least one boundary between the first lining layer and the outer wall.
A metal melting apparatus capable of providing a clear melt with little oxides, even when either one or a mixture of scrap material and fresh material is supplied. Solution is provided by a metal melting apparatus including melting chamber to which a melt raw material is supplied, and gas injection system for injecting gas into melt in the melting chamber to generate a vortex of melt in the melting chamber.
F27B 3/04 - Hearth-type furnaces, e.g. of reverberatory typeElectric arc furnaces of multiple-hearth typeHearth-type furnaces, e.g. of reverberatory typeElectric arc furnaces of multiple-chamber typeCombinations of hearth-type furnaces
[Problem] To provide a melt mixing system that: makes it possible to suppress generation of oxides during a step for mixing together a first melt obtained by melting a first melt material and a second melt obtained by melting a second melt material; and is for producing a homogeneous melt free of admixed oxide (or mixed with only a small amount of oxide). [Solution] A melt mixing system characterized by comprising a first melting device 10 for melting a first melt material to produce a first melt, a second melting device 1 for melting a second melt material to produce a second melt, and a connecting pipe W20 for connecting the first melting device 10 and the second melting device 1 together, wherein: the second melt produced by the second melting device 1 is transported through an internal space of the connecting pipe W20 to the first melting device 10 so as to be mixed with the first melt material and/or the first melt in the interior of the first melting device 10; the second melting device 1 is provided with a tapping chamber for storing the second melt transported to the first melting device 10; the first melting device 10 is provided with a pouring chamber for storing the second melt that has been transported from the second melting device 1; and when some of the second melt stored in the pouring chamber is discharged to outside the pouring chamber and the level of the liquid surface in the pouring chamber drops, the second melt in the tapping chamber moves to the pouring chamber through the connecting pipe W20 due to the siphon principle.
B22D 35/00 - Equipment for conveying molten metal into beds or moulds
C22B 7/00 - Working-up raw materials other than ores, e.g. scrap, to produce non-ferrous metals or compounds thereof
F27B 3/04 - Hearth-type furnaces, e.g. of reverberatory typeElectric arc furnaces of multiple-hearth typeHearth-type furnaces, e.g. of reverberatory typeElectric arc furnaces of multiple-chamber typeCombinations of hearth-type furnaces
A melting and holding furnace includes a main body and a material input mechanism supplying a molten metal to the body which includes a melting chamber; a molten metal receiving chamber; a pumping-out chamber; and a molten metal heating mechanism. The input mechanism includes a molten-metal surface level sensor to detect that the surface height position of the metal in the pumping-out chamber has reached a lower limit that is set to be above the lower surface height position of a lid of the melting chamber, and is set to supply the receiving chamber with the metal and/or the metal block when the sensor detects that the surface height position of the metal in the pumping-out chamber has reached the lower limit so that the surface height position of the metal in the pumping-out chamber is always kept above the lower surface height position of the lid.
F27B 3/04 - Hearth-type furnaces, e.g. of reverberatory typeElectric arc furnaces of multiple-hearth typeHearth-type furnaces, e.g. of reverberatory typeElectric arc furnaces of multiple-chamber typeCombinations of hearth-type furnaces
F27D 21/00 - Arrangement of monitoring devicesArrangement of safety devices
F27D 1/18 - Door framesDoors, lids or removable covers
[Problem] To provide a molten metal holding furnace for low-pressure casting, whereby inflow of bubbles generated from a refractory material constituting a molten metal storage container from the lower-end opening of a stoke can be prevented or suppressed. [Solution] A molten metal holding furnace for low-pressure casting, having a furnace body which comprises a molten metal storage container 10 and a stoke 3 for connecting a die cavity and molten metal M inside the molten metal storage container 10, and a pressurized-gas supply means for supplying a pressurized gas to the internal space in the molten metal storage container 10, the molten metal holding furnace for low-pressure casting having a bubble guidance member 20 which is disposed facing the lower-end opening of the stoke 3 and in which an outer edge 20a thereof is positioned further to the outside than the position of the lower-end opening of the stoke 3, the bubble guidance member 20 having a contacting lower surface 20b in which the lower surface of at least a peripheral part of the bubble guidance member 20 contacts the molten metal M, and the contacting lower surface 20b being provided with a guidance part having an incline that rises toward the outer edge 20a.
[Problem] To provide a metal melting furnace which makes it possible to prevent or inhibit the leakage of a melt and to regulate the direction of the leakage. [Solution] A metal melting furnace provided with a melt accommodation section which has an outer wall 1 at the outer peripheral part thereof and can hold a metal melt M therein, in which a plurality of cladding material layers are provided on an inner wall of the metal melting furnace which forms the melt accommodation section, a first cladding layer 10 constituting a surface that contacts with the metal melt M, among the cladding material layers, is made from a refractory material, and a sealing material 50 is provided at at least one boundary between the first cladding layer 10 and the outer wall 1.
Provided is a metal melting device (10) with which it is possible to obtain pure molten metal containing few oxides even when a scrap material and a new material are supplied in a mixed or independent manner. The aforementioned problem is solved by a metal melting device (10) comprising a melting chamber (11) to which a molten raw material is supplied, and an air jetting device (14) that jets air into molten metal inside the melting chamber (11) and generates an eddy current in the molten metal inside the melting chamber (11).
F27B 3/04 - Hearth-type furnaces, e.g. of reverberatory typeElectric arc furnaces of multiple-hearth typeHearth-type furnaces, e.g. of reverberatory typeElectric arc furnaces of multiple-chamber typeCombinations of hearth-type furnaces
F27B 3/10 - Details, accessories or equipment, e.g. dust-collectors, specially adapted for hearth-type furnaces
F27B 3/22 - Arrangements of air or gas supply devices
Provided is a melting and holding furnace which, by means of a relatively simple configuration, is able to suppress the formation of oxides, thereby increasing production efficiency and reducing the running cost. This melting and holding furnace is equipped with a melting furnace body 2 and a material loading mechanism 3 for supplying molten metal M to the melting furnace body. The melting furnace body is equipped with a melting chamber 4, a molten metal receiving chamber 5, a dip-out chamber 6, and a molten metal heating mechanism 7, and the melting chamber is equipped with a melting chamber lid 8. The material loading mechanism is equipped with a molten metal surface level sensor S for detecting when the surface height position of the molten metal in the dip-out chamber has fallen to a lower-limit level that has been set in the dip-out chamber so as to be higher than a lower-surface height position of the melting chamber lid. When the molten metal surface level sensor detects that the molten metal surface height position in the dip-out chamber has fallen to the lower-limit level, molten metal and/or metal ingots are supplied to the molten metal receiving chamber so as to constantly maintain the molten metal surface height position in the dip-out chamber at a position above the lower-surface height position of the melting chamber lid.
B22D 45/00 - Equipment for casting, not otherwise provided for
B22D 18/04 - Low pressure casting, i.e. making use of pressures up to a few bars to fill the mould
F27B 3/04 - Hearth-type furnaces, e.g. of reverberatory typeElectric arc furnaces of multiple-hearth typeHearth-type furnaces, e.g. of reverberatory typeElectric arc furnaces of multiple-chamber typeCombinations of hearth-type furnaces
An immersion-type burner heater includes a heater protection tube that is installed so as to penetrate a furnace wall or an upper lid of the molten-metal holding furnace with the tip end thereof being closed; an inner cylindrical member arranged inside the tube so as to define a combustion flow passage S between the tube and itself with the tip end side thereof being open and the inside thereof serving as an exhaust gas flow passage; and a gas burner part supplying fuel gas and air to the combustion flow passage. A helically extending projecting part is provided on at least one of the outer peripheral surface of the member and the inner peripheral surface of the tube at a position that is closer to its tip end side than to the part penetrating the furnace wall or the upper lid.
Furnaces, other than for laboratory use; melting furnaces;
heat treating furnaces for industrial purposes; heating
furnaces for industrial purposes; sintering furnaces for
industrial purposes; calcining furnaces for industrial
purposes; industrial furnaces; coolers for furnaces; heaters
for furnaces; gas generating furnaces for industrial
purposes; heating elements.
Provided is a molten metal holding furnace with heat dissipation and insulating properties. An insertion hole 20 of a molten metal holding furnace 10 has an inside cylindrical portion (tapered surface) 21 and an outside cylindrical portion 22 (cylindrical surface). A heating tube 30 has a distal cylindrical portion 35 corresponding to the inside cylindrical portion 21 and a proximal cylindrical portion 36 corresponding to the outside cylindrical portion 22. The heating tube 30 is inserted and positioned in the insertion hole with the distal cylindrical portion 35 positioned at the inner cylindrical portion 21 and the proximal cylindrical portion 36 positioned at the outside cylindrical portion 22. A filling material 60 is filled between the heating tube 30 and the insertion hole 20.
B22D 41/015 - Heating means with external heating, i.e. the heat source not being a part of the ladle
B22D 45/00 - Equipment for casting, not otherwise provided for
H05B 3/44 - Heating elements having the shape of rods or tubes non-flexible heating conductor arranged within rods or tubes of insulating material
F22B 3/08 - Other methods of steam generationSteam boilers not provided for in other groups of this subclass at critical or supercritical pressure values
H05B 3/66 - Supports or mountings for heaters on or in the wall or roof
Provided are an immersion-type burner heater and a molten-metal holding furnace capable of achieving high heat transmissibility and lowering exhaust-gas temperature. This immersion-type burner heater comprises: a heater protection tube 2 that has a closed tip-end part and is provided in a penetrating state in a furnace wall or an upper lid of a molten-metal holding furnace; an inner tube member 3 that is arranged inside the heater protection tube with a combustion flow path S provided between itself and the heater protection tube, the inner tube member being open on the tip-end side, the interior of the inner tube member constituting an exhaust-gas flow path; and a gas burner part 4 that supplies a fuel gas and air to the combustion flow path. On the side more toward the tip end than a section penetrating the furnace wall or the upper lid, a helically extending elongate projection 2a is provided to the outer circumferential surface of the inner tube member and/or the inner circumferential surface of the heater protection tube.
Provided are an immersion-type burner heater and a molten-metal holding furnace capable of achieving high heat transmissibility and lowering exhaust-gas temperature. This immersion-type burner heater comprises: a heater protection tube 2 that has a closed tip-end part and is provided in a penetrating state in a furnace wall of a molten-metal holding furnace; an inner tube member 3 that is arranged inside the heater protection tube with a combustion flow path S provided between itself and the heater protection tube, the inner tube member being open on the tip-end side, the interior of the inner tube member constituting an exhaust-gas flow path; and a gas burner part 4 that supplies a fuel gas and air to the combustion flow path. On the side more toward the tip end than a section penetrating the furnace wall, a helically extending elongate projection 2a is provided to the outer circumferential surface of the inner tube member and/or the inner circumferential surface of the heater protection tube.
Provided is a heater protection tube for use with a molten metal holding furnace with heat dissipation and insulating properties. A heat protection tube 31 has a distal tapered cylindrical portion 35 corresponding to the inside tapered cylindrical portion 21 and a proximal non-tapered cylindrical portion 36 corresponding to the outside non-tapered cylindrical portion 22. The heater protection tube (31) is configured so that it can be mounted in the side wall (13) with the distal tapered cylindrical portion (35) located at the inside tapered cylindrical portion (21) and with the proximal non-tapered cylindrical portion (36) located at the outside non-tapered cylindrical portion (22).
F22B 3/08 - Other methods of steam generationSteam boilers not provided for in other groups of this subclass at critical or supercritical pressure values
B22D 45/00 - Equipment for casting, not otherwise provided for
Provided is a molten metal holding furnace that combines heat dissipation properties and heat retaining properties. An insertion through-hole 20 of a molten metal holding furnace 10 has an inner cylindrical portion (tapered surface) 21 and an outer cylindrical portion 22 (cylindrical surface). A heating tube 30 has a tip-side cylindrical portion 35 that corresponds to the inner cylindrical portion 21 and a base end-side cylindrical portion 36 that corresponds to the outer cylindrical portion 22. The heating tube 30 is positioned by being inserted into the insertion through-hole with the tip-side cylindrical portion 35 positioned at the inner cylindrical portion 21 and the base end-side cylindrical portion 36 positioned at the outer cylindrical portion 22, and a filling material 60 is filled into the space between the heating tube 30 and the insertion through-hole 20.
H05B 3/44 - Heating elements having the shape of rods or tubes non-flexible heating conductor arranged within rods or tubes of insulating material
B22D 45/00 - Equipment for casting, not otherwise provided for
F22B 3/08 - Other methods of steam generationSteam boilers not provided for in other groups of this subclass at critical or supercritical pressure values
F24D 11/02 - Central heating systems using heat accumulated in storage masses using heat pumps
H05B 3/66 - Supports or mountings for heaters on or in the wall or roof
Provided is a heater protective tube for a molten metal holding furnace that combines heat dissipation properties and heat retaining properties. A heater protective tube 31 has a tip-side tapered cylindrical portion 35 and base end-side non-tapered cylindrical portion 36 that correspond, respectively, to a furnace inner-side tapered cylindrical portion 21 and furnace outer-side non-tapered cylindrical portion 22 formed in an insertion through-hole 20. The heater protective tube 31 is configured to be attachable to a side wall 13 with the tip-side tapered cylindrical portion 35 and base end-side non-tapered cylindrical portion 36 positioned at the furnace inner-side tapered cylindrical portion 21 and furnace outer-side non-tapered cylindrical portion 22.
H05B 3/66 - Supports or mountings for heaters on or in the wall or roof
B22D 45/00 - Equipment for casting, not otherwise provided for
F22B 3/08 - Other methods of steam generationSteam boilers not provided for in other groups of this subclass at critical or supercritical pressure values
A dual-chambered molten metal holding furnace is for low pressure casting; producing cast products such as aluminum alloys using a low pressure casting method; and prevention of the gas release to the molten metal and the occurrence of air bubbles in the molten metal even when pressurized gas enters a material constituting the molten metal storage container. The part of a pressurizing chamber excluding a pressurizing pipe and a molten metal output pipe is opened to the atmosphere via an air passage gap positioned above a fixed molten metal surface level position L3. The air passage gap is positioned above the fixed molten metal surface level position L3. Even if pressurized gas is seeped into the material constituting a molten metal storage container via cracks or cracking subsequently occurred in the pressurizing pipe or minute gap originally present in the pressurizing pipe, the pressurized gas seeped from the air passage gap is released to the outside of the furnace.
B22D 18/04 - Low pressure casting, i.e. making use of pressures up to a few bars to fill the mould
B22D 35/04 - Equipment for conveying molten metal into beds or moulds into moulds, e.g. base plates, runners
B22D 41/22 - Closures sliding-gate type, i.e. having a fixed plate and a movable plate in sliding contact with each other for selective registry of their openings
B22D 41/005 - Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like with heating or cooling means
The present invention relates to a two chamber molten metal holding furnace for low-pressure casting for manufacturing a cast product of an aluminum alloy or the like, and the purpose of the present invention is to prevent releasing of pressurized gas into molten metal and formation of bubbles in the event of intrusion of the pressurized gas into the material constituting a molten metal storage container. The area corresponding to a pressurization chamber (22) excluding a pressurization pipe (48) and a tapping pipe (50) is opened to the atmosphere via a ventilation gap (66) that is positioned higher than a fixed molten metal surface position (L3). The ventilation gap (66) is positioned higher than the fixed molten metal surface position (L3). Even when the pressurized gas has exuded into the material constituting the molten metal storage container (12) through cracks and fissures subsequently formed in the pressurization pipe or through a preexisting minute gap in the pressurization pipe, the pressurized gas is released to the outside of the furnace from the ventilation gap (66).
An immersion heater capable of completely avoiding a situation where an outer circumferential border of a spiral heating element is pressed to an inner wall of a protecting tube, and preventing disconnection due to contact between adjacent portions of the heating element. In the immersion heater, one edge portion of a metal strip heating element (8) is inserted into, and held in a spiral groove (7) to form a spiral heating part (9). Cylindrical-body supporting members (11) are provided and each has a diameter smaller than an inner diameter of the ceramic bottom protecting tube (2) and larger than an outer diameter of the spiral heating part. The cylindrical-body supporting members are fitted into a hollow portion of the insulating cylindrical body (6) and are arranged in openings at a fore-end and a back-end of the insulating cylindrical body, respectively.
