JPH021589B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a molten metal spouting nozzle for a thin plate manufacturing apparatus that continuously manufactures thin sheets by rapidly cooling and solidifying molten metal, and particularly to a molten metal spouting nozzle that is designed to prevent the shape of the molten metal spouting part from changing. The present invention relates to a molten metal ejection nozzle for a thin plate manufacturing apparatus.

Conventionally, as shown in FIG. 1 in a thin plate manufacturing apparatus, molten metal 3 from a pool 2 is placed on the surface of a moving cooling body, such as a continuously rotating cooling roll 1.
It is known that the thin plate material 5 is continuously ejected through a nozzle body 4 and cooled and solidified along the surface of the rotating cooling roll, and then the thin plate material 5 is continuously wound up on a winding machine 6.

The molten metal jetting nozzle of such a thin plate manufacturing apparatus generally has a slit 7 of a predetermined width t approximately in the center of the nozzle body 4, as shown in FIG. 2, for example.

However, in such a conventional nozzle structure, there is a certain limit to the width dimension of the thin plate material that can be manufactured.
The reality is that it can only be manufactured in mm size.

The reason for this is that the slit 7 portion of the nozzle body 4 is largely deformed during pouring. That is, in the conventional nozzle structure, the slits 7 are uniformly formed in the nozzle body 4 from the side of the molten metal pool 2 to the spouting end, so that the nozzle body 4 is able to control the pouring pressure of the molten metal 3. And it is extremely easily deformed by thermal expansion due to the high heat of the molten metal. In other words, in a conventional nozzle body, the strength in the width direction is low except for both ends in the long side direction of the slit. Therefore, when pressurized molten metal is ejected from the slit, the slit is It is easy to cause deformation in which the middle part of the body bulges out. Furthermore, in terms of thermal expansion (in the case of steel, the temperature is over 1300°C), the slit portion through which the molten metal flows is considerably hotter than the outer circumferential portion of the nozzle body that comes into contact with the outside air. For this reason, the nozzle body has both side surfaces forming the slit undergo larger thermal expansion than the outer surface, and as a result, the middle portion of the slit is deformed to be narrower than both end portions.

The effects of such pressurizing force and thermal expansion are magnified in proportion to the length of the slit, and with the conventional nozzle structure described above, the inner thickness of the manufactured thin sheet material is uneven due to the deformation of the slit. Therefore, in order to manufacture a thin plate material with high dimensional accuracy, a problem arose in which the width had to be limited as described above.

Note that the nozzle body is made of fire-resistant material, e.g.
It is common to use materials such as Al ₂ O ₃ , SiO ₂ , and Zr, which are weak against deformation and easily brittle, and therefore cannot be solved by simply increasing the wall thickness to increase strength. It is. That is, if the wall thickness is made excessively large, a large temperature change occurs between the inside and outside of the nozzle body, making the nozzle body susceptible to breakage.For this reason, it has been difficult to realize a nozzle structure for manufacturing wide box board materials.

By the way, as a conventional nozzle structure of this type, for example, as shown in FIG. 3 or FIG.
In some cases, instead of slits, a large number of small diameter holes 8 are arranged in a line or in a dispersed arrangement. According to the nozzle having such a structure, the parts of the nozzle body 4 other than the small-diameter hole 8 have an integral structure, so that the strength can be improved compared to the case where a slit is provided. However, since the molten metal is ejected from each small diameter hole 8 of the nozzle body 4 in a dispersed state, it is difficult to manufacture a thin plate with a uniform thickness. are likely to be spaced apart between adjacent small diameter holes 8, resulting in a decrease in the plate thickness in that area, or, conversely, to overlap, resulting in a large plate thickness, which is undesirable from the standpoint of dimensional accuracy. It had become a thing.

The present invention has been made in view of these circumstances, and the slit portion of the nozzle body is hardly deformed by the pressing force of molten metal or high heat, and a plate material with uniform and minute thickness and high dimensional accuracy can be produced. It is an object of the present invention to provide a molten metal spouting nozzle for a thin plate manufacturing apparatus that can be manufactured to be much wider than conventional ones.

In order to achieve such an object, the basic structure of the present invention is to provide reinforcement consisting of a plurality of bridge members for constraining the shape of the slit, which strengthens both inner walls in the short side direction of the slit on the upstream side of the slit of the nozzle body. The main feature is that the body is formed at intervals along the long side of the slit.

According to this configuration, a reinforcing body consisting of a plurality of bridge members that strengthens both sides of the slit in the short side direction is provided on the upstream side of the slit, so that temperature changes between the outer surface of the nozzle body and the slit are prevented. Therefore, even if the slit portion attempts to thermally expand significantly relative to the outer surface portion, the auxiliary bodies provided at various locations on the slit portion can prevent the deformation of the intermediate portion of the slit, thereby returning the slit to its initial state. can be maintained. Moreover, since a slit is formed at the tip of the nozzle body for spouting molten metal, the molten metal that is finally jetted out is sent out to the surface of the cooling body through the slit with a uniform thickness. become. Therefore, even if the length of the nozzle body is increased, deformation of the slit can be reliably prevented, so the width dimension of the plate material to be formed can be increased.
As described above, a plate material having a large width can be made into a uniform plate material based on the uniform distribution state, and it is possible to manufacture the plate material with high precision.

Embodiments of the present invention will be described below with reference to FIGS. 5 to 18.

5 to 8 show a first embodiment of the present invention, and first, the configuration of the thin plate manufacturing apparatus will be explained with reference to FIG.

The upper opening of the furnace 11 constituting the molten metal reservoir is covered with a cover 12, and the outer periphery is wound with a heater coil 13, and the molten metal 14 is wrapped around the outer periphery.
It is designed to accommodate. A spout pipe 15 is arranged in the center of the furnace 11 and extends from the bottom side to above the cover 12, and at the upper end of the spout pipe 15, the diameter gradually decreases toward the opening side. A spouting nozzle 16 as a nozzle body is disposed, and this spouting nozzle 16 is fixed to the cover 12 by a presser foot 17 in a state in which it communicates with the spouting pipe 15. Above the pouring nozzle 16, the lower outer circumferential surface of a drum 20, which serves as a cooling body and which is fixed to a shaft 19 rotated by a drive motor 18, is arranged to face the drum 20.

That is, the metal put into the furnace 11 is turned into molten metal 14 by energizing the heater coil 13, and by the action of the furnace internal pressure 21 as the pouring force,
It is pushed into the spouting pipe 15 and the spouting nozzle 16
from the drum 20 onto the surface of the drum 20.
It is cooled and solidified on the surface of the thin plate 22.

Next, general factors such as the furnace pressure 21, the circumferential speed of the drum 20, the temperature of the molten metal 14, and the gap between the pouring nozzle 16 and the drum 20 as factors related to the thickness accuracy of the thin plate 22 manufactured in this way will be explained. A method for controlling plate thickness will be explained.

The furnace internal pressure 21 is applied to the drum 2 so as to be able to contact the thin plate 22.
a thickness detection sensor 24 that detects the thickness of the thin plate 22 based on the amount of movement of a contact roller 23 disposed opposite to the inner surface of the furnace; Immediate control is performed based on the control amount of the pressure control panel 27 to which each output value of the pressure setting device 26 for setting an appropriate value is transmitted. That is, based on the control amount of the pressure control panel 27, the hydraulic pump 28 and the tank 29
A hydraulic cylinder 31 is actuated via a servo valve 30 by a hydraulic source consisting of. The hydraulic cylinder 31 is operated via the piston rod 32.
The volume of the cylinder chamber 34A of the pneumatic cylinder 34 disposed on the pedestal 33 is changed. Since the pneumatic cylinder 34 communicates with the upper space of the furnace 11,
Changes in the cylinder chamber 34A immediately control the furnace internal pressure 21.

The control commands for the pressure cylinder position detection sensor 37 and the furnace pressure detection sensor 25 connected to the piston rod 32 are transmitted to the valve 40 to which the pressure pump 38 and the vacuum pump 39 are connected, so that the molten metal 14 is In response to an increase in the pouring head and a decrease in the furnace pressure 21 due to pouring from the pouring nozzle 16, the space of the furnace 11 is replenished with pressure fluid,
The furnace internal pressure 21 can be controlled. Note that a throttle 41 is provided in the piping system of the valve 40 to reduce the degree of influence of the valve 40 on the operation of the pneumatic cylinder 34.

The peripheral speed of the drum 20 is determined by transmitting each output value of the thickness detection sensor 24, speed detection sensor 42, and speed setting device 43 to the speed control board 44, and controlling the rotation speed of the drive motor 18 based on the control command from the speed control board 44. controlled by adjusting.

The temperature of the molten metal 14 in the furnace 11 is determined by transmitting the output values of a temperature detection sensor 45 and a temperature setting device 46 to a temperature control panel 47, and controlling a coil power supply section 48 according to control commands from the temperature control panel 47. , is controlled by adjusting the current value applied to the heater coil 13. In the temperature control of the molten metal 14 as well, the output value of the thickness detection sensor 24 is transmitted to the temperature control panel 47, and the temperature control on the thickness of the thin plate 22 is directly performed based on the detected thickness of the thin plate 22. You may also do so.

The gap between the pouring nozzle 16 and the drum 20 is determined by transmitting each output value of the gap detection sensor 49 and the gap setting device 50 to the gap control panel 51, and controlling the hydraulic cylinder 5 according to the control command from the gap control panel 51.
2 and moves the base 53 supporting the furnace 11 up and down. In addition, in controlling the gap between the pouring nozzle 16 and the drum 20, the output value of the thickness detection sensor 24 is transmitted to the gap control panel 51, and the gap value is determined based on the detected thickness of the thin plate 22. The effect on thickness may also be directly controlled.

Further, a temperature detection sensor 54 is disposed at an arbitrary position facing the outer peripheral surface of the drum 20, and based on the detected value of the temperature detection sensor 54, cooling air or the like is blown from the outside of the drum 20 by a blower fan (not shown). The temperature of the drum 20 is controlled. By controlling the temperature of the drum 20, the material properties of the thin plate 22 can be adjusted.

The thin plate 22 whose thickness accuracy and material properties have been adjusted in this way is wound into a coil shape by the winding means described above. That is, an L-shaped swinging arm 56 is supported on the bracket 55, and a winding drum 58 is mounted on a support shaft 57 supported at one end of the swinging arm 56.
is fixed. The winding drum 58 is the drum 2
The winding motor 5
9, the thin plate 22 can be wound up under the action of vacuum suction force or electromagnetic suction force. The other end of the swinging arm 56 is connected to the tip of a piston rod of a pressing cylinder 61 supported by a trunnion on a bracket 60. This pressing cylinder 61 is connected to the winding drum 5
8 into the drum 20 side, and as the thin plate 22 is wound around the winding drum 58 and its winding diameter increases, the piston rod is moved backward so that the winding drum 58 moves away from the drum 20. A swing arm 56 is swingably held.

The winding motor 59 includes an acceleration/deceleration compensator 62 that adjusts the rotation speed of the winding drum 58 according to acceleration/deceleration of the drum 20, a torque setting device 63, and a winding motor 5.
The torque is controlled to an appropriate value by the control command of the torque control panel 65 to which each detection value of the current detection sensor 64 that detects the current value of 9 is transmitted, and the tension acting on the thin plate 22 during winding is kept constant. It is said that

Next, the above-mentioned pouring nozzle, that is, the nozzle body 16
The configuration will be explained with reference to FIGS. 6 to 8.

The nozzle body 16 consists of a main body part 16A and a flange part 16B, and is communicated with the flange part 15A of the extraction pipe 15 of the hot water basin 11 via the body part 16A, and is connected to the cover 12 of the hot water basin 11 by a fastener 17. Fixed. A slit 8 is provided at the tip of this nozzle body 16.
0 is formed, and molten metal is ejected from its tip. A reinforcing body is provided in the nozzle body 16 adjacent to the rear end side (upstream side) of the slit 80 to strengthen the short side direction of the slit 80, and the reinforcing body is bridged in the short side direction and spaced at a predetermined interval in the long side direction. This structure consists of a bridge member 81 that is fixedly installed. The bridging member 81 partitions the upstream side of the slit 80 into a plurality of channels 82 having the same cross section. The total cross-sectional area of the upstream channel 82 partitioned by the bridge member 81 is set larger than the cross-sectional area of the slit 80.

According to this configuration, a plurality of bridging members 81 are provided on the upstream side of the slit 80 to strengthen both inner walls of the slit 80 in the short side direction, so that the molten metal 1
Even if a load is applied in the width direction of the slit 80 due to the pressing force of 4, the bridge member 81 prevents the slit 80 from deforming. Further, even in response to a large thermal expansion load applied to the inner intermediate portion of the slit 80 due to the high heat of the molten metal 14, the provision of the bridge member 81 can prevent thermal expansion and deformation of the slit 80. That is, even if the slit 80 section attempts to undergo large thermal expansion due to a temperature change between the outer surface of the nozzle body 16 and the slit 80 section, and the slit gap attempts to undergo an arch-shaped thermal expansion deformation in which the middle section is narrowed, it will not occur. The compressive load caused by this can be supported by the bridge member 81, and such thermal expansion deformation can be prevented.

Note that the part of the nozzle body 16 where the bridge member 81 is provided has a large wall thickness as a whole, but this is different from simply increasing the wall thickness of the entire nozzle body, and there is a risk of breakage due to thermal expansion. This will not occur. This is different from simply increasing the wall thickness of the nozzle body, which causes a large thermal expansion strain due to the temperature difference between the outer and inner surfaces of the nozzle body. This is because it is heated evenly, so no special thermal distortion occurs due to the thick wall.

Moreover, according to the above configuration, since the total cross-sectional area of the upstream channel 82 partitioned by the bridge member 81 is made larger than the cross-sectional area of the slit 80, the molten metal flowing from the channel 82 into the slit 80 14 is ejected after the slit 80 is sufficiently filled. Therefore, unlike the conventional nozzle structure having small holes (see FIGS. 3 and 4), the thickness of the produced thin plate in the width direction can be made uniform.

According to the above nozzle configuration, for example, the plate thickness is 20
When producing a plate material with a thickness of ~50μ, it is possible to set the plate width to approximately 1000 mm, which far exceeds the conventional possible plate width (approximately 100 cm).

In addition, although in the said Example, the bridging member 81 was integrally formed with the whole nozzle body 16, this invention is not necessarily limited to such a thing. That is, the nozzle body 16 is vertically divided into two parts (nozzle body divided structure) 16a and 16b through a dividing surface along the long side direction of the slit 80, and the reinforcing body is Nozzle bodies 16a, 16
At least one bridging member 81 formed integrally with one or separately from both b, and a tightening tool that tightens and joins the nozzle bodies 16a and 16b from the outside via each bridging member 81. It is also possible to implement it as For example, Figure 9~
FIG. 11 shows a nozzle body divided structure 1 divided into two parts.
A bridge member 8 divided into two is provided on both 6a and 16b.
1 are integrally formed, and the nozzle body 16 is provided with an elastic body, for example, a stacked leaf spring 83 at the reinforcing body portion.
They are connected by fasteners such as bolts 84 and nuts 85.

Even with such a configuration, since the bridging member 81 is provided on the upstream side of the slit 80, it goes without saying that almost the same effect as that of the first embodiment can be achieved. Since the nozzle body 16 and the bridge member 81 are divided into two as a whole, the nozzle body 16 has the advantage that the internal molding can be carried out more easily than when the nozzle body 16 is integrally molded. In other words, the nozzle body is often made of a heat-resistant material that is relatively weak against deformation loads.
Since the cutting process requires relatively careful attention, such a structure makes it easy to perform the process.

In the second embodiment, the elastic body 8 is attached to the tightening portion of the tightening tool 85 against the nozzle body 16.
This is effective in preventing the nozzle body 16 or the fasteners 84, 85 from being damaged due to the difference in thermal expansion coefficient between the nozzle body 16 and the fasteners 84, 85. and the nozzle body 1
6 and the fasteners 84 and 85 have the same coefficient of thermal expansion, the elastic body 83 can be omitted.

Further, FIGS. 12 and 13 show a third embodiment of the present invention. That is, in this embodiment, the bridge member 81 has an integral structure,
This is divided into two nozzle body divided structures 16a,
16b, and is joined by fasteners 84 and 85 via an elastic body 83.

Even with such a configuration, the first and second
Of course, almost the same effects as in the embodiment are achieved, but in this case, the nozzle body 16
And since the bridge members 81 are configured differently from each other,
It has the advantage of being easier to manufacture than the configuration of the second embodiment. Although not shown, in the case where the bridge member 81 is configured separately from the nozzle body 16, it is of course possible to further divide the bridge member 81.

14 to 16 show a fourth embodiment of the present invention. That is, in this embodiment, the slit 80 and the upstream channel 82 partitioned by the bridge member 81 are arranged so that they partially overlap, and the pool side of the channel 82 is widened. However, the width of the slit side is narrowed to increase the density of molten metal ejected from the slit 80. According to such a configuration, the molten metal ejected through the slit 80 can have a more uniform packing density, and can be more effective in improving the plate thickness accuracy. In addition, the molten metal passing distance L of the slit 80
It is desirable to select and set the necessary and minimum dimensions so that the molten metal can flow into the slit 80 from the flow path 82 and fill the slit 80. It goes without saying that the set dimensions can be selected in various ways depending on the type of molten metal.

Furthermore, FIGS. 17 and 18 show a fifth embodiment of the present invention in which the shape of the flow path 82 is modified. That is, in this case, the flow path 82 is made gradually narrower in the outflow direction with respect to the width direction of the slit 80, and conversely,
The width is gradually widened in the long side direction of 0 to give characteristics to the flow state of the molten metal. In other words, by passing the molten metal through the channel 82 whose cross-sectional shape changes in this way,
The feed of the molten metal to the slit 80 can be made more uniform, and adjacent portions of the molten metal flowing through the channels 82 adjacent to each other in the long side direction of the slit 80 can be effectively maintained in a state where they are not separated from each other.

Furthermore, the present invention provides the nozzle body 16 with the hot water reservoir 11.
Of course, it may be constructed integrally with the extraction pipe or the cover 12.

As described in detail in the above embodiments, the present invention has a structure in which a reinforcing body is bridged on the upstream side of the slit of the nozzle body to restrain changes in the shape of the slit. Therefore, we have overcome the unavoidable limitations on the width dimensions of manufactured thin plates by using a reinforcing structure that is not affected by heat, and have made it possible to manufacture thin plates with extremely wider widths than in the past. This has the practical effect of expanding the degree of dimensional freedom and achieving high dimensional accuracy in thin plate manufacturing.

[Brief explanation of drawings]

Figures 1 to 4 show a conventional example, and Figure 1 is a cross-sectional view schematically showing a thin plate manufacturing apparatus, and Figures 2 to 4 show a conventional example.
Fig. 4 is a bottom view showing different types of nozzle bodies, Figs. 5 to 18 show embodiments of the present invention, Fig. 5 is a configuration diagram showing the entire thin plate manufacturing apparatus, and Fig. 6 is a An enlarged sectional view of main parts showing the first embodiment of the present invention, FIG. 7 is a sectional view taken along the line - in FIG. 6,
FIG. 8 is an operational explanatory diagram showing a thin plate manufacturing apparatus, FIGS. 9 to 11 show a second embodiment of the present invention, FIG. 9 is an enlarged cross-sectional view of a nozzle body, and FIG. 10 is an enlarged sectional view of a nozzle body. FIG. 11 is a sectional view from the center side of FIG. 10, FIGS. 12 and 13 show a third embodiment of the present invention, and FIG. 12 is an enlarged sectional view of the nozzle body. 13 is a bottom view showing the entire nozzle body, FIGS. 14 to 16 show a fourth embodiment of the present invention, FIG. 14 is an enlarged sectional view of the nozzle body, and FIG. 15 is a bottom view showing the entire nozzle body. FIG. 14 is a sectional view taken along the line 14, FIG. 16 is a bottom view of FIG. 15, FIGS. 17 and 18 show a fifth embodiment of the present invention, and FIG. 17 is an enlarged sectional view of the nozzle body. , Figure 18 is the first
FIG. 7 is a cross-sectional view of FIG. 20... Cooling body, 16... Nozzle body, 16a,
16b... Nozzle body division structure, 80... Slit, 81... Bridge member, 82... Channel, 11...
Hot water reservoir, 84, 85, 17... Tightening tool, 83...
...Elastic body.

Claims (1)

[Scope of Claims] 1. A molten metal spouting nozzle for a thin plate manufacturing apparatus in which molten metal from a pool is continuously spouted from a slit formed at the tip of a nozzle body to a moving cooling body. A reinforcing body is provided adjacent to the rear end side of the slit to strengthen the short side of the slit, and the reinforcing body is bridged in the short side direction and fixed at predetermined intervals in the long side direction. A molten metal spouting nozzle for a thin plate manufacturing device, characterized in that it is made of a bridge member. 2. The molten metal spouting nozzle for a thin plate manufacturing apparatus according to claim 1, wherein the reinforcing body comprises at least one bridging member formed integrally with the nozzle body. 3. The reinforcing body includes at least one bridge member that is formed integrally with one or separately from both of the nozzle bodies that are vertically divided into two parts through a dividing plane along the long side direction of the slit; 2. A molten metal spouting nozzle for a thin plate manufacturing apparatus according to claim 1, further comprising a fastener for tightening and joining the nozzle body from the outside via each bridge member. 4. A molten metal spouting nozzle for a thin plate manufacturing apparatus according to claim 3, wherein the fastener fastens the nozzle body via an elastic body. 5. A molten metal spouting nozzle for a thin plate manufacturing apparatus according to any one of claims 1 to 4, wherein the nozzle body is formed integrally with a pool. 6. The thin plate manufacturing apparatus according to any one of claims 1 to 4, characterized in that the nozzle body is separate from the molten metal pool and is joined to the molten metal pool using a fastener. molten metal spout nozzle. 7. The thin plate manufacturing apparatus according to any one of claims 1 to 6, wherein the total cross-sectional area of the upstream portion partitioned by the bridge member is larger than the cross-sectional area of the slit. Molten metal spout nozzle.