JPS63268559A - Sliding gate - Google Patents

Abstract

PURPOSE:To smoothly flow out molten metal from a runner part by arranging an induction heating means at runner position, where the molten metal passes through the sliding gate. CONSTITUTION:The molten metal 4 in the induction heating vessel 2 providing a coil 3 for induction heating, is passed through the runner part 6a in the fixed side gate 6 and the runner part 7a in the sliding side gate 7. Then, the coil 8 for induction heating is arranged at the runner part in the fixed side gate 6 to melt the metal at the runner part 6a. By this method, the opening ratio at the runner parts 6a, 7a in the sliding gate 1 can be obtained at 100% and even if the molten metal flow is small diameter flow, the flowing-out can be smoothly carried out.

Description

[Detailed description of the invention] [Purpose of the invention]

(Industrial Application Field) This invention relates to a sliding gate used to control the blocking and outflow of a molten metal flow, and particularly to a sliding gate used to control the blocking and outflow of a molten metal flow when the molten metal flow is a narrow diameter flow. It concerns a sliding gate suitable for control. (Prior Art) Conventionally, this type of sliding gate has been used, for example, as shown in FIG. 5, to control the outflow of molten metal in a ladle. That is, in FIG. 5, 51 is a ladle, and 52 is ladle 1.
The molten metal 53 placed inside is slag floating on the surface of the molten metal 52. The bottom of the ladle w451 is provided with an upper nozzle 54 having a runner part 54a through which the molten metal 52 passes. Fixed side gate (fixed plate) 5 having a runner part 55a through which the metal 52 passes
A slide side gate (sliding @) 56 having a runner portion 56a through which the molten metal 52 passes is provided on the lower surface of the fix side gate 55. When the molten metal 52 is not allowed to flow down, the fix side gate 55 side gate 5
The positions of the runner part 55a of No. 5 and the runner part 56a of the slide side gate 56 are shifted, and the upper nozzle 54
The runner portion 54a of the fixed side gate 55 and the runner portion 55a of the fixed side gate 55 are filled with filler (sand) 57. In order to cause the molten metal 52 in the ladle 51 to flow down, the slide side gate 56 is slid in the right direction in FIG. let Therefore, the runner portion 56a of the slide side gate 56
The filler (sand) 57 falls, and subsequently the molten metal 52 falls onto each runner portion 54a. It flows down through 55a and 56a. (Problems to be Solved by the Invention) However, in the conventional sliding gate described above, the slide side gate 56 is slid in the right direction in FIG. Filling (sand)
57 may not fall smoothly, resulting in a problem that the so-called natural aperture ratio is low. When the natural opening does not occur, the runner portion 55a,
Although it is necessary to perform an enema operation in which pure 02 is injected with 56a in a communicating state, there are problems in that such an operation is complicated and not only undesirable from a safety standpoint. In addition, even if the sliding gate 56 opens naturally by sliding, the filler (sand) 57 will be mixed into the molten metal, and if an enema operation is performed by blowing pure 02, the molten metal will be oxidized. In any case, there was a problem in that the molten metal was contaminated. (Object of the Invention) This invention was made in view of the above-mentioned conventional problems, and it is possible to make the aperture ratio in the molten metal runner part of the sliding gate part 100%, and in particular, it is possible to make the molten metal flow It is possible to flow out the molten metal extremely smoothly even when the flow is of a small diameter, and it is possible to prevent contamination of the molten metal because there is no need for enema work by filling or injecting pure 02 as in the past. The purpose is to provide a sliding gate.

[Structure of the invention]

(Means for Solving the Problems) The present invention provides a sliding gate including a fixed side gate having a runner portion through which molten metal passes and a sliding side gate having a runner portion through which molten metal passes. It is characterized by having an induction heating means provided in the runner portion through which the metal passes. The sliding gate according to the present invention is installed at the bottom or side wall of a ladle or induction heating container to form an ingot (see above).
Note: Applicable when transferring molten metal into a mold, when installed at the bottom of a tundish or induction heating container to supply a molten metal flow into a powder manufacturing chamber, and when performing other small-diameter continuous casting or molten metal rolling. However, there are no particular limitations. (Example 1) FIG. 1 is a diagram showing an example of the present invention, in which a sliding gate 1 is provided at the bottom of an induction heating container 2. As shown in FIG. This induction heating container 2 is equipped with an induction heating coil 3 inside the furnace wall, and this induction heating coil 3 is connected to a main melting power source (not shown), and also houses molten metal 4 inside the container. Therefore, slag 5 is present on the surface of molten metal 4. The sliding gate 1 installed at the bottom of the induction heating container 2 has a runner section 6a through which the molten metal 4 passes.
and a slide side gate 7 having a runner section 7a through which the molten metal 4 passes, and the runner section of the fixed side gate 6 is equipped with a runner section induction heating coil 8 as an induction heating means. A runner heating power source (not shown) is connected to the induction heating coil 8, and the main melting power source and the runner heating power source are constructed separately. . When transferring the molten metal 4 into the induction heating vessel 2 in which such a sliding gate 1 is installed, the slide side gate 7 is slid toward the left of the MIIN (that is, the state shown in FIG. 1), and the runner section is moved. 6a and runner part 7
A is brought into a discontinuous state, and molten metal 4 is transferred from a ladle or the like (not shown). Alternatively, the metal lump is melted into molten metal 4 by placing the metal lump in the induction heating container z and supplying power to the induction heating coil 3 from the main melting power source. At this time,
Transferred into induction heating container 2. Alternatively, a portion of the molten metal 4 melted in the induction heating container 2 in the runner portion 6a of the fixed side gate 6 is in a solidified state. In this state, when the molten metal 4 is caused to flow down, the slide side gate 7 is slid in the right direction in FIG. Power is supplied to the coil 8 to melt the metal in the runner portion 6a. Therefore, simultaneously with melting, the molten metal flows down from the runner section 7a. Note that when power is supplied to the runner section induction heating coil 8, the slide side gate 7 is positioned to the left in FIG. After melting, the slide gate 7 may be slid in the first [ffl right direction to cause the molten metal to flow down from the runner portion 7a. FIG. 2 shows a case where atomized powder is manufactured using the induction heating container 2 equipped with the sliding gate 1 shown in FIG. As shown in FIG. 2, a chamber 11 for totomizing is provided at the bottom side of the induction heating container 2 having the configuration shown in FIG. The case is shown in which 7 Tomized powder 13 is stored inside. Therefore, when manufacturing the atomized powder 13, the slide side gate 7 is inserted into the runner part 6a of the fixed side gate 6 provided at the bottom of the induction heating container 2 containing the molten metal 4 while the metal is solidified. 2. Slide it to the right in Figure 2 to bring both runner parts 6a and 7a into communication state,
Power is supplied from the runner section heating power source 18 to the runner section induction heating coil 8 to melt the metal in the runner section 6a, and at the same time the molten metal 4 is introduced into the atomizing chamber 11 through the runner section 7a. flow 4
Let it flow down as a. This atomization chamber 11
is provided with a nozzle 14 for ejecting N2 gas, and the N2 gas ejected from this nozzle 14 collides with the molten metal flow 4a to become atomized powder 13, which is accumulated in the container 12. (Comparative Example 1) FIG. 3 shows a manufacturing procedure for atomized powder in a comparative example, in which an induction heating coil 23 is provided inside the furnace wall of an induction heating container 22, and this induction heating coil 23 is used for melting (not shown). The molten metal 24 is housed inside the container, and slag 25 is present on the surface of the molten metal 24. Further, a tundish 26 is installed at the top of the atomization chamber 31 similar to that shown in FIG. At the same time, a container 32 is installed at the bottom of this chamber 31, and the atomized powder 3 is placed inside this container 32.
Try to save up 3. Therefore, when manufacturing the atomized powder 33, the tundish 26 is preheated, the induction heating container 22 is tilted, and the molten metal 24 in the induction heating container 22 is transferred into the preheated tundish 26. The molten metal 24 transferred into the tundish 26 flows down into the totomizing chamber 31 from a nozzle 26a formed at the bottom thereof as a molten metal B flow 24a. This atomization chamber 31 is provided with a nozzle 34 for ejecting N2 gas, and N2 gas is ejected from this nozzle 34.
The two gases collide with the molten metal stream 24a to become atomized powder 33, which is accumulated in the container 32. (Evaluation Example) In Comparative Example 1 described above, the temperature of the molten metal 24 in the induction heating container 22 needs to be set high because the molten metal 24 in the induction heating container 22 is once transferred into the tundish 26. However, in the case of Example 1, since the molten metal 4 in the induction heating container z is allowed to flow down as it is, it is possible to lower the temperature of the molten metal 4 than in the case of Comparative Example 1. It was possible to lower the hot water temperature by approximately 80 degrees Celsius, resulting in significant power savings. Further, in the case of Comparative Example 1, air pollution occurs when the molten metal 24 in the induction heating vessel 22 is transferred into the tundish 26, but in Example 1, since a tundish is not used, there is no risk of air pollution as in Comparative Example 1. do not have. Further, in the case of Comparative Example 1, it is necessary to preheat the tundish 26, but in the case of Example 1, since the tundish is not used, preheating can be saved. Furthermore, in Comparative Example 1, the molten metal 24 in the induction heating container 22 is transferred into the tundish 26 together with the slag 25, so there is a high possibility that the molten metal 24 and the slag 25 will be stirred in the tundish 26, resulting in atomization. This is likely to cause slag to be mixed into the powder 33, but in the case of Example 1, there is no risk of slag being mixed into the atomized powder 13. Furthermore, in the case of Embodiment 1, there is no need for a tundish, so it is possible to reduce the cost of refractories, and there is also an advantage that workability can be improved, such as there being no need to tilt the induction heating container 22. are doing. (Embodiment 2) FIG. 4 is a diagram showing another embodiment of the present invention, in which the sliding gate 1 is integrally provided at the bottom of the induction heating container 2. This induction heating container 2 is equipped with an induction heating coil 3 inside the furnace wall, and this induction heating coil 3 is connected to a power source 42 via a changeover switch 41. The slag 5 is present on the surface of the molten metal 4. A fixed side gate 6 is provided at the bottom of the induction heating container 2.
The fixed side gate 6 of the sliding gate 1 is integrally installed, and this fixed side gate 6 has a runner part 6a through which the molten metal 4 passes, A runner section induction heating coil 8 is provided near the runner section 6a as an induction heating means for the runner section, and is attached to the bottom of the induction heating container 2 as a so-called assembly plug. The runner section induction heating coil 8 is connected to a power source 42 via the switch 41. In addition, a sliding gate 7 is provided on the bottom surface of the fixed side gate 6 together with the fixed side gate 6.
A slide side gate 7 is provided, and this slide side gate 7 also has a runner section 7 through which the molten metal 4 passes.
A is a provision. Furthermore, a seal box 4 is provided at the bottom of the induction heating container 2.
3 is installed, and the inside of this seal box 43 is
An Ar gas supply pipe 44 is connected so that r gas can be replaced, and a constant @45 is installed inside to provide this constant g14.
An ingot mold 46 is installed on top of the mold 5. This ingot mold 46
A riser frame 47 is installed at the upper part of the holder. When performing ingot making using the apparatus shown in FIG. The metal mass is melted in the chamber 2 and maintained at a predetermined temperature. In this case, the metal in the runner portion 6a of the fixed side gate 6 is in a solidified state. Moreover, the slide side gate 7 has moved to the left as shown in FIG. 4, and the runner parts 6a and 7a are in a state where they are not communicating with each other. Next, the switch 41 is switched to the runner section induction heating coil 8 side, the power source 42 is connected to the runner section induction heating coil 8, and the solidified metal in the runner section a is melted. Next, when the slide side gate 7 is slid to the right in FIG. 4 to bring the runner parts Oa and 7a into communication, the molten metal 4 passes through the runner parts 6a and 7a and forms an ingot in the seal box 43. It is cast into a mold 46 and becomes an ingot after solidifying. In an example of implementation, when an ingot is formed by the non-contaminating agglomeration shown in FIG. 4, the [0] content in the molten metal 4 in the induction melting furnace z is 13 ppm, but the ingot also contains 0] content was 13 ppm, which did not increase at all, and no [01 pick-up was observed during ingot making, which is an excellent result, and it is possible to cast clean metal. When an ingot is formed in the atmosphere by installing an ingot forming mold in the lower part of the induction heating container 51 shown in FIG. 5, the [0] content in the molten metal 52 in the induction heating container 51 is 13 ppm. However, in the ingot, the [0] content increased considerably to 22 ppm, and considerable [0] pick-up was observed during ingot formation.

【Effect of the invention】

As explained above, according to the present invention. A sliding gate comprising a fixed side gate having a runner part through which molten metal passes, and a sliding side gate having a runner part through which molten metal passes,
Since the induction heating means is provided in the runner portion through which the molten metal passes, it is the turning portion that makes the opening ratio of the molten metal runner portion of the sliding gate portion 100%, especially when the molten metal flow is narrow. Even when the flow is radial, the molten metal can flow out extremely smoothly, and contamination of the molten metal can be easily prevented because there is no need for enema work such as stuffing or injecting pure 02 as in the conventional method. , a very excellent effect is brought about.

[Brief explanation of drawings]

FIG. 1 is a schematic vertical cross-sectional explanatory diagram of an induction heating container with a sliding gate installed at the bottom according to an embodiment of the present invention;
Figure 2 is a schematic vertical cross-sectional explanatory diagram showing the procedure for manufacturing atomized powder using the induction heating container shown in Figure 1, and Figure 3 is the procedure for manufacturing atomized powder using the conventional induction heating container and tundish. A schematic vertical cross-sectional explanatory diagram showing
FIG. 4 is a schematic vertical cross-sectional view showing the procedure for non-contaminating agglomeration using an induction heating vessel with a sliding gate integrally installed at the bottom according to another embodiment of the present invention, and FIG. 5 is a diagram showing a conventional sliding gate. FIG. DESCRIPTION OF SYMBOLS 1... Sliding gate, 4... Molten metal, 6... Fixed side gate, 6a... Runner part of fixed side gate, 7...
Slide side gate, 7a... Runner part of slide side gate, 8... Runner part induction heating coil (induction heating means), 18.42... Power source. 7a Run dimension - @p Figure 2 Figure 3

Claims (1)

[Claims] (1) In a sliding gate comprising a fixed side gate having a runner part through which molten metal passes and a sliding side gate having a runner part through which molten metal passes, induction heating means is provided in the runner part through which the molten metal passes. A sliding gate characterized by having a configuration in which it is provided.