JP7174235B2 - Cold Crucible Melting Furnace and Method for Removing Concrete in Cold Crucible Melting Furnace - Google Patents

Description

The present invention relates to a cold crucible melting furnace, and in particular, a cold crucible melting furnace with improved maintainability such as removal of a solidified material called skull that has solidified at the bottom of the furnace body after bottom tapping and regeneration of the tapped portion. and a method for removing concretions in a cold crucible smelting furnace.

As a cold crucible melting furnace, for example, the one disclosed in Patent Document 1 is known. The melting furnace includes a furnace body including a furnace side wall and a hearth and forming a space for melting the object to be melted therein, and an opening provided in the hearth of the furnace body for discharging the object to be melted. It is equipped with a hot water outlet. The furnace side wall is composed of a water-cooled copper crucible, and the hearth is composed of a water-cooled copper bottom plate.

A melting coil for induction-heating a material to be melted put into the furnace body is provided around the outer periphery of the furnace body, and a tapping coil for induction-heating a tapping portion is provided on the hearth.

Then, the melting coil is energized from a high-frequency power supply to induction-heat the inside of the furnace body to melt the object to be melted, and the solidified material to be melted, called skull, is generated at the bottom of the furnace body by cooling the hearth. , the solidified material formed in the tapping portion is melted by induction heating with another high-frequency power source, and the molten metal can be tapped through the tapping portion.

The tapped molten metal is poured into a mold placed below to produce castings, or to produce powder by gas atomization.

Japanese Patent No. 4774590

In such a configuration, solidified matter remains in the furnace main body or in the tapping portion after tapping. If remelting is performed in the next lot without taking it out, the solidified matter in the tapping part will not melt well and stable tapping will not be possible, and in the worst case, tapping will not be possible. Also, if the material to be melted is changed in the next lot, contamination will occur due to contamination unless the solidified matter is removed. Therefore, it is necessary to remove the solidified matter and maintain the tapping part every time molten metal is melted and tapped, and this work imposes a heavy burden on the operator and also affects productivity. The solidified matter remaining in the furnace body faces the furnace side wall on the side and touches the hearth on the lower side, and does not have the shape necessary to remove it, that is, the shape that can be grasped using a tool or the like. making the task more difficult.

Patent Document 1 and the like have a structure in which the hearth is fitted to the inner circumference of the furnace side wall that constitutes the furnace body, so the molten metal advances into the gap between the outer peripheral surface of the hearth and the inner peripheral surface of the furnace side wall and solidifies. Then, burrs of the solidified material are generated in the vertical direction. Since the melt solidifies and shrinks when it solidifies, it is extremely difficult to remove this burr.

As described above, in the conventional furnace, maintenance such as removal of the solidified matter and regeneration of the tapped part is not particularly considered, and it is difficult to properly remove it even with tools, so maintenance is easy and productivity is improved. Improvement was desired.

Focusing on such problems, the present invention particularly provides a cold crucible melting furnace with improved maintainability such as removal of solidified matter after bottom tapping and regeneration of the tapped part, and removal of solidified matter in the cold crucible melting furnace. The purpose is to implement a new method.

In order to achieve this object, the present invention takes the following measures.

That is, the cold crucible melting furnace of the present invention includes a furnace body including a furnace side wall and a hearth and forming a furnace space for melting an object to be melted therein; a molten metal discharge part having an opening for discharging molten metal, the object to be melted is melted by induction-heating the inside of the furnace body while the hearth is cooled, and the object to be melted is discharged from the molten metal discharge part after melting. In the hot water tap, the furnace body is assembled so as to be placed on the hearth without engaging the lower end of the furnace side wall, and the furnace side wall is separated from the hearth by pulling upward. The furnace main body is fixed to a fixed wall for use, and has a fixed portion for fixing the furnace side wall to the fixed wall via a support portion, and the fixed portion is fixed. is released, the side wall of the furnace can be separated from the hearth .

In this way, by pulling up the furnace side wall after melting and discharging, the solidified material to be melted that has solidified in the furnace main body remains on the hearth, and the solidified material adhered to the portion extending from the hearth to the furnace side wall. Since the outer peripheral end face of the object is open, it becomes easy to grasp and remove the coagulum. Therefore, maintenance and productivity including cleaning of the hot water outlet and parts replacement are improved.
Further, the furnace body is fixed to a fixed wall for use, and has a fixing portion for fixing the furnace side wall to the fixed wall via a support portion. If the furnace side wall is separable from the hearth, the furnace side wall can be easily separated from the hearth.
The cold crucible melting furnace of the present invention includes a furnace main body including a furnace side wall and a hearth and forming a furnace space for melting an object to be melted therein, and a furnace body provided in the hearth of the furnace main body for tapping the object to be melted. The melting object is melted by induction-heating the inside of the furnace body while the hearth is cooled, and the melting object is discharged from the molten metal exit after melting. In a cold crucible melting furnace, the furnace body is assembled so as to be placed on the hearth without engaging the lower end of the furnace side wall, and the furnace side wall is lifted upward from the hearth. The furnace body is separable and used by fixing the furnace main body to the fixed wall. and a second fixing part fixed to the fixed wall by the second fixing part, and the furnace side wall is removed from the hearth by releasing the fixing of the second fixing part without releasing the first fixing part. It is characterized by being separable.
In this way, by pulling up the furnace side wall after melting and discharging, the solidified material to be melted that has solidified in the furnace main body remains on the hearth, and the solidified material adhered to the portion extending from the hearth to the furnace side wall. Since the outer peripheral end face of the object is open, it becomes easy to grasp and remove the coagulum. Therefore, maintenance and productivity including cleaning of the hot water outlet and parts replacement are improved.
More specifically, the furnace body is fixed to a fixed wall for use, and includes a first fixing portion for fixing the hearth to the fixed wall, and a support portion for fixing the side wall of the furnace to the fixed wall. and a second fixing part fixed to the wall, and the furnace side wall can be separated from the hearth by releasing the fixing of the second fixing part without releasing the first fixing part. Then, the side wall of the furnace can be easily separated from the hearth, and the hearth can be dismantled if necessary.

In addition, if a melting coil is provided on the outer periphery of the furnace body for induction heating of the material to be melted that is put into the furnace body, and the furnace side wall is pulled up from between the melting coil and the hearth, the melting coil can be heated. Even if it exists, separation of the furnace side wall provides sufficient space between the solidified material and the melting coil to bring out the solidified material, thereby improving the convenience of removing the solidified material and repairing the hearth. .

In the above, if the tapping part is composed of a nozzle mounting part provided on the hearth and a nozzle detachably mounted on the nozzle mounting part, when removing the solidified material, the nozzle and the inside of the nozzle The solidified matter can also be removed together, making it easier to replace nozzles and maintain the hearth.

As a method for removing solidified matter in a cold crucible melting furnace , a furnace body including a furnace side wall and a hearth and forming a furnace space for melting an object to be melted therein, and an object to be melted provided in the hearth of the furnace body The furnace body is used by fixing it to a fixed wall, and the fixed part for fixing the furnace side wall to the fixed wall via a support part is provided. A method for removing a solidified matter in a cold crucible melting furnace comprising: melting an object to be melted put into a furnace space while the hearth of the furnace body is cooled; After the hot water is discharged from the provided hot water discharge part, the fixing of the fixing part is released, so that the furnace side wall can be separated from the hearth, and the furnace side wall constituting the furnace body also constitutes the furnace body. The furnace side wall is lifted upward with respect to the hearth on which it is placed, so that the solidified matter remaining at the bottom of the furnace space is solidified into the gap between the upper surface of the hearth and the lower end surface of the furnace side wall. According to the method of removing the burrs of the object together with the burrs, it is possible to appropriately remove the solidified matter remaining in the furnace body with a very simple operation, and it is possible to significantly improve the convenience of maintenance.
As a method for removing solidified matter in a cold crucible melting furnace, a furnace body including a furnace side wall and a hearth and forming a furnace space for melting an object to be melted therein, and an object to be melted provided in the hearth of the furnace body The furnace body is used by fixing it to a fixed wall, the first fixing part fixing the hearth to the fixed wall; and a second fixing portion for fixing a furnace side wall to the fixed wall via a support portion, and a method for removing solidified matter in a cold crucible melting furnace in which the hearth of the furnace main body is cooled. After melting the object to be melted put into the space and tapping the object to be melted from the tapping portion provided on the hearth after melting, the second fixing portion is fixed without releasing the first fixing portion. is released, the furnace side wall can be separated from the hearth, and the furnace side wall constituting the furnace body can be moved upward with respect to the hearth on which the furnace side wall, which also constitutes the furnace body, is placed. to remove the solidified matter remaining at the bottom of the furnace space together with the burrs of the solidified matter that have advanced into the gap between the upper surface of the hearth and the lower end surface of the side wall of the furnace. It is possible to appropriately remove the solidified matter remaining in the furnace body during the work, and it is possible to significantly improve the convenience of maintenance.

Since the present invention has the structure described above, it is possible to easily separate the furnace side wall from the hearth, thereby dramatically facilitating a series of maintenance work, such as removing the solidified matter formed on the bottom of the furnace body. Therefore, it is possible to provide an excellent cold crucible melting furnace and a method for removing solidified matter in the cold crucible melting furnace that can shorten the working time and improve productivity.

1 is a schematic cross-sectional front view of a cold crucible melting furnace according to one embodiment of the present invention; FIG. FIG. 3 is a schematic partial cross-sectional view showing a vacuum chamber in which the same cold crucible melting furnace is installed. The figure which shows the state at the time of disassembly of the same cold crucible melting furnace. FIG. 7 is a diagram showing the coagulum produced in the same embodiment together with the coagulum produced in the comparative example of FIG. 6 ; The figure which shows the mode of removal of solidified matter in the same cold crucible melting furnace. FIG. 2 is a schematic front sectional view corresponding to FIG. 1 showing a comparative example of the same cold crucible melting furnace;

An embodiment of the present invention will be described below with reference to the drawings.

The basic functions of the cold crucible melting furnace CCF according to the present embodiment are substantially the same as those described in Background Art.

That is, the cold crucible melting furnace CCF shown in FIG. 12 and a tapping part 2 forming an opening 2a for tapping the object A to be melted. The furnace side wall 11 is composed of a water-cooled copper crucible, and the hearth 12 is composed of a water-cooled copper bottom plate. A cooling mechanism is omitted.

A melting coil 3 for induction-heating the object A to be melted put into the furnace body 1 is provided around the outer periphery of the furnace body 1 , and a tapping coil 4 for induction-heating the tapping section 2 is provided on the hearth 12 .

Then, by energizing the melting coil 3 from a high-frequency power supply (not shown), the inside of the furnace body 1 is induction-heated, thereby melting the object A to be melted, and cooling the hearth 12 to generate skulls at the bottom of the furnace body 1. The tapping part 2 is closed with a solidified material a to be melted, and the solidified material a formed in the tapping part 2 is melted by induction heating by energizing the tapping coil 4 from another high-frequency power supply (not shown). , the molten metal can be discharged through the tapping part 2.

More specifically, the hearth 12 is made of a disk-shaped copper plate, and when viewed from above, the hearth 12 is fan-shaped along the circumference by slits (not shown) extending radially from the vicinity of the center. segments, and the segments are connected near the center. Of course, the segments may be divided by one or more slits even in the vicinity of the center. Each segment can be cooled by a cooling path (not shown).

The opening 2a of the tapping part 2 consists of a tapered part and a linear orifice part. It is configured. The nozzle 22 is used to obtain certainty and stability of molten metal discharge, and is made of refractory material and graphite, or graphite, high-melting-point metal, the same material as the molten material, and reactivity with the molten material. We use materials that take into account The reason for using graphite is that it is not only resistant to thermal shock but also serves as a heating element by induction heating.

The furnace side wall 11 is made of copper and divided into strip-shaped segments along the circumferential direction by slits (not shown) extending from the lower end to the vicinity of the upper end when the furnace side wall 11 is viewed not from the cross section but from the front or the side. and the segments are connected near the upper end. A spirally wound melting coil 3 for induction heating is arranged on the outer circumference of the furnace side wall 11 . The magnetic field induced by the current of the melting coil 3 induces eddy currents in the metal to be melted A in the furnace body 1 through the gaps of the slits between the segments, and the metal self-heats.

In this way, the magnetic flux from the induction heating coil 3 acts on the metal to be melted in the furnace body through the gaps of the slits between the segments of the furnace side wall 11, so that the melted metal becomes dome-shaped due to the pinch force. The side faces the furnace side wall 11 and the bottom contacts the hearth 12, which is also made of copper. do. The solidified material a prevents contact between the molten metal thereon and the copper hearth 12 and the furnace side wall 11 that constitute the furnace body 1 . Therefore, high-melting-point and active metals such as titanium can be melted without contamination. This is the same even if the kind of metal changes.

The tapped molten metal is poured into a mold (not shown) arranged below to produce cast products, or is used to produce metal powder by a gas atomizing mechanism (not shown).

This type of melting furnace is suitable for melting expensive metals.

With such a configuration, the present embodiment comprises a cold crucible melting furnace CCF consisting of a _first assembly structure 11 including a hearth 12 and a tapping section 2 and a second assembly structure including a furnace side wall 11 and a support section 5 which will be described later. It consists of _{two assembly structures 1 and 2} . At that time, the diameter D2 of the hearth 12 is made larger than the diameter D1 of the furnace side wall 11, and is shaped like a flat plate or disk, and the furnace side wall 11 is placed on the hearth 12 in such a manner that the molten metal does not leak. It adopts a laying structure. In other words, the lower end surface 11a of the furnace side wall 11 abuts against the upper surface 12a of the hearth 12, and the hearth 12 and the furnace side wall 11 are assembled under a structure that does not fit.

The specific structure of this cold crucible melting furnace CCF will be described below in relation to the vacuum chamber 10 in FIG. This cold crucible melting furnace CCF is arranged in a vacuum chamber 10 . The vacuum chamber 10 is divided into a lower space 10b and an upper space 10c via an intermediate wall 10a which is a fixed wall. The cold crucible melting furnace CCF is assembled in the upper space 10c, and an admizing mechanism, for example, is arranged in the lower space 10b. The upper space 10c is provided with a hatch 10d into which an object to be melted is placed, and the lower space 10b also employs an appropriate opening/closing structure for taking out the products after the atomization process.

A circular opening 10e is provided in the intermediate wall 10a, and the diameter D2 of the hearth 12 shown in FIG. 1 is set larger than the diameter D3 of the opening 10e. It is arranged at a position where the lid is closed and fixed with a fastener V1 such as a bolt. This fixed portion corresponds to the first fixed portion F1 of the present invention.

The furnace side wall 11 has an enlarged flange portion 11b at its upper end. This fixed portion corresponds to the second fixed portion F2 of the present invention. In the illustrated example, the flange portion 11b of the furnace side wall 11 and the support portion 5 are connected by a fastener V2 such as a bolt, and the support portion 5 and the support 10a are connected by a fastener V3 such as a bolt.

A melting coil 3 for induction-heating the space S in the furnace is spirally wound on the furnace side wall 11 . The melting coil 3 and the furnace side wall 11 are non-contact.

Therefore, for example, if the fastener V3 fixing the support portion 5 is removed, the _second assembly structure 12 including the furnace side wall 11 and the support portion 5 can be replaced with the hearth 12 and the tapping portion as shown in FIG. It can be separated from the _first assembly structure 11 containing 2 and simply pulled upwards.

FIG. 6 shows a comparative example showing the configuration of a cold crucible melting furnace to be compared with the present invention. The configuration is similar to the configuration in which the hearth can be disassembled in the prior art document cited in Background Art, and the base plate 161 is arranged at a position that closes the opening 110e of the intermediate wall 110a, and the fastener V11 such as a bolt is arranged. , and the furnace side wall 111 is fixed on the base plate 161 by fasteners V12 such as bolts. A mounting flange 162 is applied to the base plate 161 from below so as to cover the fastener V12, and is fixed by a fastener V13 such as a bolt. A bottom plate mounting base 163 is supported on the mounting flange 162 . The bottom plate mounting base 163 is cylindrical and is arranged so as to be fitted to the inner circumference of the base plate 161 and the inner circumference of the furnace side wall 111, and the hearth 112 is placed on the upper end via the hearth support member 164. , the hearth 112 and the hearth support member 164 are fastened from below by fasteners V14 such as bolts.

A melting coil 103 is arranged on the upper surface of the base plate 161 and around the outer circumference of the furnace side wall 111 . A flange 111b is provided on the upper end of the furnace side wall 111, and the flange 111b is fixed via a support portion 105 to a post 110a erected on the intermediate wall 110a by a fastener V15 such as a bolt. there is

During maintenance of the furnace main body 101, even if the fastener V15 that secures the support portion 105 to the column 110a1 is removed, the furnace side wall 111 is fixed to the intermediate wall 110a via the fasteners V12 and V13. , cannot be easily separated from the hearth 112 . Further, even if the hearth 112 can be disassembled, the connection with the furnace side wall 111 cannot be released unless at least the fasteners V14 and V13 are removed.

As a result, in order to remove the solidified substance b of the object B to be melted, called a skull, formed in the portion extending from the hearth 112 to the side wall 111 of the furnace, the whole must be disassembled, requiring a great deal of labor. Accompany. Moreover, even if the hearth 112 and the side wall 111 are fitted together, as shown in FIG. When the molten metal advances into the gap and solidifies, a vertical burr b1 of the solidified material b is generated, and this burr b1 condenses on the outer peripheral surface 112a of the hearth 112 while shrinking during cooling, so it can be removed. becomes extremely difficult.

On the other hand, according to the structure of the present embodiment shown in FIG. 1, at least if the fastener V3 that attaches the support portion 5 to the column 10a1 is removed, the furnace side wall 11 can be lifted by a crane or the like as shown in FIG. and the _second assembly structure 12 including the support part 5 is simply pulled up, separated from the _first assembly structure 11 including the hearth 12 and the tapping part 2, and moved out of the vacuum chamber 10. can be made

At that time, as shown in FIG. 4( a ), among the solidified substances a that have solidified on the portion extending from the upper surface 12 a of the hearth 12 to the inner peripheral surface 11 c of the furnace side wall 11 , The portion where the solidified material a is is contracted in the radial direction during cooling, so that it can be peeled off relatively easily.

By pulling up the furnace side wall 11, the solidified material a remained on the hearth 12 as shown in FIG. ax is released. Therefore, it can be easily removed by gripping the corner c between the outer peripheral end surface ax and the upper surface ay of the solidified material a with a tool.

At that time, the barrier a1 of the solidified material a shown in FIG. Since the shrinkage causes relative movement with respect to the hearth 12, it prevents sticking to the upper surface 12a of the hearth 12 and the lower end surface 11a of the furnace side wall 11. In addition, as shown in FIG. 5, when removing the solidified matter a, the barrier a1 can also be lifted up and removed together.

The tapping part 2 of the present embodiment is composed of a nozzle mounting part 21 made up of a tapered part and a linear orifice provided in the hearth 12 and a funnel-shaped nozzle 22 mounted on the nozzle mounting part 21. Since the solidified material a cooled after tapping is integrated with the solidified material a2 in the nozzle 22 and the nozzle 22, the nozzle 22 and the solidified material a2 in the nozzle 22 are pulled up together. Therefore, not only the removal of the solidified material a, but also the replacement of the nozzle 22 and the repair of the hearth 12 can be easily performed.

After that, the moved _second assembly structure 12 is placed on the hearth 12 in the original state, and fixed to the intermediate wall 10a via the support 10a1 at the fixing portion F2, so that the next lot can be melted. can move.

As described above, the cold crucible melting furnace CCF of the present embodiment includes the furnace body 1 which includes the furnace side wall 11 and the hearth 12 and forms the furnace space S in which the object A to be melted is melted, and the furnace body 1 and a tapping part 2 having an opening 2a for tapping the object A to be melted, which is provided on the hearth 12 of the furnace. A is melted, the tapping part 2 is cooled, the opening 2a is closed with the solidified material a, and the tapping part 2 is induction-heated to melt the solidified material a, thereby tapping the melting object A from the bottom part. A furnace main body 1 is assembled so as to be placed on a hearth 12 without fitting the lower end of the furnace side wall 11, and the furnace side wall 11 can be separated from the hearth 12 by pulling it upward. is.

In this way, by pulling up the furnace side wall 11 after the molten metal is melted, the solidified material a to be melted that has solidified in the furnace body 1 remains on the hearth 12, and the portion extending from the hearth 12 to the furnace side wall 11 Since the outer peripheral end face ax of the solidified substance a adhering to is released, it becomes easy to grasp and remove the solidified substance a. For this reason, it becomes easy to regenerate the _first assembly structure ₁₁ such as the hearth 12 and to replace parts. This makes it easier to repair, etc., and improves maintainability and productivity as a whole.

Further, a melting coil 3 for induction-heating the object A to be melted put into the furnace body 1 is provided on the outer circumference of the furnace body 1. A furnace side wall 11 extends from between the melting coil 3 and the hearth 12. Since it is possible to pull up, by separating the furnace side wall 11, a sufficient space for taking out the solidified material a can be secured between the solidified material a and the melting coil 3, and the solidified material a can be taken out and the hearth 12 The convenience of repair can be improved.

The cold crucible melting furnace CCF is used by fixing the furnace main body 1 to the intermediate wall 10a, which is a fixed wall. By releasing the fixation of the fixing portion F2, the furnace side wall 11 can be separated from the hearth 12, so the furnace side wall 11 can be easily separated from the hearth 12.

More specifically, the furnace main body 1 is fixed to the intermediate wall 10a for use, and the first fixing portion F1 for fixing the hearth 12 to the fixed wall 10a and the support portion 5 for the furnace side wall 12 are provided. The second fixing portion F2 is fixed to the intermediate wall 10a via the second fixing portion F2, and the second fixing portion F2 is released without releasing the first fixing portion F1, so that the furnace side wall 11 is fixed to the hearth. Since it is separable from 12, the furnace side wall 11 can be easily separated from the hearth 12, and the hearth 12 can be disassembled if necessary.

In the above, since the hot water outlet part 2 is configured by the nozzle mounting part 21 provided on the hearth 12 and the nozzle 22 detachably mounted on the nozzle mounting part 21, when removing the solidified material a The nozzle 22 and the solidified matter a2 in the nozzle 22 can also be removed together, and the convenience of exchanging the nozzle 2 and maintenance of the hearth 12 is further improved.

Then, as a method for removing the solidified matter a in the cold crucible melting furnace CCF as described above, the melting object A put into the furnace space S is melted, and the hearth 12 of the furnace main body 1 is cooled. With the opening 2a of the tapping section 2 provided in the floor 12 closed with the solidified materials a and a2 to be melted, the tapping section 2 is subsequently heated to partially melt the solidified materials a and a2 to obtain the melted material. After pouring A from the tapping portion 2, the furnace side wall 11 constituting the furnace body 1 is lifted upward with respect to the hearth 12 on which the furnace side wall 11, which also constitutes the furnace body 1, is placed. Since the method of removing the solidified material a remaining at the bottom of the inner space S together with the barrier a2 of the solidified material a that has advanced into the gap between the upper surface 12a of the hearth 12 and the lower end surface 11a of the furnace side wall 11 is adopted, the method is extremely simple. The solidified material a remaining in the furnace body 1 during the work can be appropriately removed, and maintenance convenience can be significantly improved.

Although one embodiment of the present invention has been described above, the specific configuration of each part is not limited to the above-described embodiment, and various modifications are possible without departing from the scope of the present invention.

For example, although the melting coil is installed on the hearth side, it may be installed on the side wall of the furnace. In this case, since there is a connection for power supply water (not shown), it is removed as a part of the _second assembly structure 12 .

In addition, although the inner surface of the furnace side wall has a straight shape with the same diameter at each part in the above embodiment, it may have a tapered shape that spreads slightly downward so that the solidified material remains on the bottom.

Furthermore, in the above embodiment, the skull formed by melting is used to close the nozzle, but the nozzle may be closed using a plate made of the same metal or alloy as the melted material, or a conical plug. can also

DESCRIPTION OF SYMBOLS 1... Furnace main body 2... Hot water outlet part 2a... Opening 3... Melting coil 5... Support part 10a... Fixed wall (intermediate wall)
DESCRIPTION OF SYMBOLS 11... Furnace side wall 12... Hearth 21... Nozzle mounting part 22... Nozzle A... Object to be melted a... Solidified material a2... Burr CCF... Cold Crusive melting furnace F1... Fixed part (first fixed part)
F2: Fixed part (second fixed part)
S ... Furnace space

Claims (6)

A furnace body that includes a furnace side wall and a hearth and forms a furnace space for melting an object to be melted therein; A cold crucible melting furnace in which an object to be melted is melted by inductively heating the inside of the furnace body while the hearth is cooled, and the object to be melted is discharged from the tapping portion after melting,
The furnace main body is assembled so as to be placed on the hearth without the lower end of the furnace side wall being fitted, and the furnace side wall can be separated from the hearth by pulling upward . can be,
The furnace main body is fixed to a fixed wall for use, and has a fixing portion for fixing the furnace side wall to the fixed wall via a support portion. A cold crucible melting furnace, characterized in that the furnace side walls are separable from the hearth. A furnace body that includes a furnace side wall and a hearth and forms a furnace space for melting an object to be melted therein; A cold crucible melting furnace in which an object to be melted is melted by inductively heating the inside of the furnace body while the hearth is cooled, and the object to be melted is discharged from the tapping portion after melting,
The furnace main body is assembled so as to be placed on the hearth without the lower end of the furnace side wall being fitted, and the furnace side wall can be separated from the hearth by pulling upward . can be,
The furnace body is fixed to a fixed wall for use, and includes a first fixing portion for fixing the hearth to the fixed wall and a first fixing portion for fixing the furnace side wall to the fixed wall via a support portion. 2 fixing parts, and by releasing the fixation of the second fixing part without releasing the first fixing part, the furnace side wall can be separated from the hearth. The Cold Crucible Melting Furnace. 2. A melting coil for inductively heating an object to be melted put into the furnace body is provided on the outer periphery of the furnace body, and the furnace side wall can be lifted from between the melting coil and the hearth. The cold crucible melting furnace according to 2 . 4. The cold crucible melting furnace according to any one of claims 1 to 3 , wherein the tapping part comprises a nozzle mounting part provided on the hearth and a nozzle detachably mounted on the nozzle mounting part. A furnace body that includes a furnace side wall and a hearth and forms a furnace space for melting an object to be melted therein; A method for removing solid matter in a cold crucible melting furnace, wherein the furnace main body is fixed to a fixed wall for use, and the furnace side wall has a fixing portion for fixing the furnace side wall to the fixed wall via a support portion There is
The object to be melted put into the furnace space is melted while the hearth of the furnace body is cooled, and after the melted object is melted, the melted object is tapped from the tapping portion provided in the hearth, and then the fixing portion is fixed. By releasing, the furnace side wall can be separated from the hearth, and the furnace side wall constituting the furnace body can be moved upward with respect to the hearth on which the furnace side wall is placed and which also constitutes the furnace body. Cold crucible melting, characterized in that the solidified matter remaining at the bottom of the furnace space is removed together with the burrs of the solidified matter that have advanced into the gap between the upper surface of the hearth and the lower end surface of the side wall of the furnace. A method for removing concretions in a furnace. A furnace body that includes a furnace side wall and a hearth and forms a furnace space for melting an object to be melted therein; The furnace main body is fixed to a fixed wall for use, and includes a first fixing part for fixing the hearth to the fixed wall, and a support part for fixing the furnace side wall to the fixed wall. A method for removing coagulum in a cold crucible melting furnace, comprising:
The object to be melted, which is put into the furnace space while the hearth of the furnace body is cooled, is melted, and after the melted object is discharged from the tapping portion provided in the hearth, the first fixing portion is provided. By releasing the fixing of the second fixing part without releasing the second fixing part, the furnace side wall can be separated from the hearth, and the furnace side wall constituting the furnace body can be separated from the furnace body. The side wall is lifted upward with respect to the hearth on which it is placed, so that the solidified matter remaining at the bottom of the furnace space is removed from the solidified matter that has advanced into the gap between the upper surface of the hearth and the lower end surface of the furnace side wall. A method for removing solidified matter in a cold crucible melting furnace, characterized in that the solidified matter is removed together with the burrs of the cold crucible melting furnace.

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