JPS5877746A - Ejecting nozzle for molten metal of producing device for thin sheet - Google Patents

Abstract

PURPOSE:To permit production of thin sheets of extremely large width by providing plural reinforcing bodies for restraining the shape of the slit of a nozzle body which reinforce both inside walls in the short side direction of the upper stream side of said slit spacially in the long-side direction. CONSTITUTION:An ejecting nozzle 16 for molten metal ejects the molten metal from a well through a slit 80 at the preceding end of the nozzle body onto a moving cooling body. Plural reinforcing bodies 81 for restraining the shape of the slit bridging both inside walls in the short-side direction of the slit 80 are formed on the upper stream side of the slit 80 spacially into one body in the long-side direction. More specially, the bodies 81 are juxtaposed in the region of about 1/3 the roughly central part in the flow passage direction of the body 16. Thus even if the load in the transverse spreading direction of the slit 80 is acted by the pressurizing force of the molten metal, the deformation is blocked by the bodies 81.

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 a thin plate manufacturing apparatus, for example, as shown in FIG.
The molten metal 3 from the pool 2 is continuously ejected onto the surface of a moving cooling body, for example, a continuously rotating cooling roll 1 via a nozzle body 4, and is cooled and solidified along the surface of the rotating cooling roll. A device in which a thin plate material 5 is continuously wound up on a winding machine 6 is known.

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 on the width dimension of the thin plate material that can be manufactured.
The reality is that it is only possible to manufacture a board with a thickness of 0 to 50μ and a board width of about 100rIrIn.

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, there is a slit 7 in the nozzle body 4.
is formed uniformly from the sump 2 side to the spout end, so the nozzle body 4 is extremely susceptible to deformation due to the pouring pressure of the molten metal 3 and thermal expansion due to the high heat of the molten metal. It is something. In a conventional nozzle body, the strength in the width direction is low except for both ends of the long side of the slit, so when pressurized molten metal is ejected from the slit, it is difficult to The middle part of the slit tends to bulge out. Also, when looking at thermal expansion (in the case of steel, the temperature is over 1300C)
The slit portion through which the molten metal flows is considerably hotter than the outer peripheral portion of the nozzle body that comes into contact with the outside air. For this reason, the nozzle body experiences larger thermal expansion at both side surfaces forming the slit than at the outer surface, resulting in deformation such that the middle portion of the slit becomes 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 thickness of the manufactured thin plate material becomes uneven due to the deformation of the slit. In order to manufacture thin plate materials with high dimensional accuracy, the problem arises that it is necessary to limit the width to narrow ones as described above.

The nozzle body is made of a fire-resistant material, for example AA20. .

It is common to use a material that is weak against deformation and easily brittle, such as Sin or Zr, and therefore it is not possible to simply increase the wall thickness in order to increase the strength. That is, if the wall thickness is excessively increased, a large temperature change occurs between the inside and outside of the nozzle body, making it easy to break, and from this point of view, it has been difficult to realize a nozzle structure for manufacturing with a wide box plate.

By the way, as a conventional nozzle structure of this type, for example, the third
As shown in the figure or FIG. 4, there is a nozzle body 4 in which instead of slits, a large number of small diameter holes 8 are provided in a line or in a dispersed arrangement. According to a nozzle with such a configuration,
Since the portions of the nozzle body 4 other than the small diameter hole 8 have an integral structure, the strength can be improved compared to the case where slits are 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. This is undesirable from the standpoint of dimensional accuracy, as metals tend to separate between adjacent small-diameter holes 8, reducing the thickness of the plate in that area, or conversely become overlapping, resulting in a large plate thickness. 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 pressurizing force of molten metal or high heat, and a plate material with a uniform and minute thickness and high dimensional accuracy is available. 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 as a very wide one.

In order to achieve such an object, the basic configuration of the present invention is to provide a plurality of reinforcing bodies on the upstream side of the slit of the nozzle body for constraining the shape of the slit and reinforcing both inner walls in the short side direction of the slit. The reason is that they are arranged at intervals in the long side direction.

According to this configuration, a plurality of reinforcing bodies are provided on the upstream side of the slit to strengthen both sides of the slit in the short side direction, so that the slit part is prevented by temperature changes between the outer surface of the nozzle body and the slit part. Even if the outer surface portion undergoes large thermal expansion, the reinforcing bodies provided at various locations on the slit portion can prevent the intermediate portion of the slit from deforming, and the slit can be maintained in its initial state. 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, the deformation of the slit can be reliably prevented, so the width of the plate to be formed can be increased, and such a large width plate can be made into a uniform shape as described above. The plate material can be made uniform based on the distribution state, and the plate material can be manufactured 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,
- 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 water tank is covered with a cover 12 into which metal is introduced, and the outer periphery is covered with a heater coil 13.
The molten metal 14 is wound around the molten metal 14 to accommodate the molten metal 14. In the center of the furnace 11, a spouting pipe 15 is arranged which extends from the bottom side to above the cover 12, and on the upper end side of the spouting pipe 15 there is a nozzle whose diameter gradually decreases as the opening side approaches. A pouring nozzle 16 as a body is arranged, and this pouring nozzle 16 is fixed to the cover 12 by a presser foot 17 in a state in which it communicates with the pouring pipe 15. Above the pouring nozzle 16 is a drum 2 as a cooling body fixed to a shaft 19 rotated by a drive motor 18.
The lower outer circumferential surfaces of o are arranged to face each other.

That is, the metal charged into the furnace 11 is turned into molten metal 14 by energizing the heater coil 130, is pushed into the pouring pipe 15 by the action of the furnace internal pressure 21 as a pouring force, and is poured from the pouring nozzle 16 into the drum 20. is ejected onto the surface of the drum 20, and is cooled and solidified on the surface of the drum 20 to form a thin plate 22.
It is said that

Next, the furnace pressure 21 is a factor related to the thickness accuracy of the thin plate 22 manufactured in this manner. peripheral speed of drum 20,
A method of controlling the temperature of the molten metal 14 and the gap between the pouring nozzle 16 and the drum 20 will be explained.

The pressure inside the furnace 21 is determined by the amount of movement of a contact roller 23 that is disposed facing the drum 20 so as to be able to contact the thin plate 22.
Thickness detection sensor 24 for detecting the thickness of 24. Furnace pressure detection sensor 25 is installed inside the cover 12 and detects the furnace pressure 21.
A pressure control panel 270 to which each output value of the pressure setting device 26 for setting an appropriate value of the furnace internal pressure 21 is transmitted is subjected to immediate control based on the control amount. That is, based on the control amount of the pressure control panel 27, the hydraulic cylinder 31 is operated via the servo pulp 3° by a hydraulic source consisting of a hydraulic pump 28 and a tank 29. The operation of the hydraulic cylinder 31 changes the volume of the cylinder chamber 34A of the pneumatic cylinder 34 disposed on the pedestal 33 via the piston rod 32. Since the pressure cylinder 34 communicates with the upper space of the furnace 11, changes in the cylinder chamber 34A immediately control the furnace internal pressure 21.

Note that the air pressure cylinder position detection sensor 37 connected to the piston rod 32. Each control command for the furnace pressure detection sensor 25 is sent to the pressure pump 38. The pressure is transmitted to the pulp 40 to which the vacuum pump 39 is connected, and the pressure is increased in the space of the furnace 11 in response to an increase in the pouring head and a decrease in the furnace pressure 21 as the molten metal 14 is poured out from the pouring nozzle 16. By replenishing the fluid, the furnace internal pressure 21 can be controlled. In addition, pulp 4
A throttle 41 is arranged in the piping system of 0, and a pneumatic cylinder 34
The influence of the pulp 40 on the operation of the pulp 40 is reduced.

The circumferential speed of the drum 20 is measured by a thickness detection sensor 24. Speed detection sensor 42. Each output value of the speed setter 43 is sent to the speed control panel 44.
The rotational speed of the drive motor 18 is controlled based on the control command from the speed control panel 44.

The temperature of the molten metal 14 in the furnace 11 is measured by a temperature detection sensor 4''
5. Each output value of the temperature setting device 46 is transmitted to the temperature control panel 47, and the coil power supply unit 4 is controlled by the control command from the temperature control panel 47.
8 and adjust the current value applied to the heater coil 13. In addition, this weld metal 1
4, the output value of the thickness detection sensor 24 is transmitted to the temperature control panel 47, and the temperature control over the thickness of the thin plate 22 is directly performed based on the detected thickness of the thin plate 22. good.

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 operating the hydraulic cylinder 52 according to the control command from the gap control panel 51. It is controlled by moving 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 arranged at an arbitrary position facing the outer circumferential 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). 20 temperatures are controlled. By controlling the temperature of this 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 manner is wound into a coil by the winding means described above.

That is, the bracket 55 has an L-shaped swing arm 56.
A take-up citram 58 is fixed to a support shaft 57 supported at one end of the swing arm 56. The winding drum 58 is disposed facing the outer peripheral surface of the drum 2o, is rotated by a winding motor 59, and is capable of winding up the thin plate 22 under the action of vacuum suction force or electromagnetic suction force. The other end of the swing arm 56 is connected to the tip of a piston rod of a suppression cylinder 61 supported by a trunnion on a bracket 60. This suppression cylinder 61 pushes the winding drum 58 toward the drum 20 side, and as the thin plate 22 is wound on the winding citrus 58 and its winding diameter increases, the suppression cylinder 61 moves its piston rond back and takes up the winding. A swing arm 56 is swingably held in a direction in which the drum 58 moves away from the drum 20.

The winding motor 59 includes an acceleration/deceleration compensator 62 that adjusts the rotational speed of the winding drum 58 in accordance with the acceleration/deceleration of the drum 20. 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 the winding motor 59 is transmitted, and the thin plate 22 during winding is controlled. The tension acting on is kept constant.

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

The nozzle body 16 consists of a main body part 16A and a collar part 16B,
It communicates with the flange 15A of the extraction pipe 15 of the hot water reservoir 11 through the flange 16B, and is tightened by the tool 17.
It is fixed to the cover 12 of 1. A slit 80 is formed at the tip of the nozzle body 16, and a plurality of reinforcing bodies 81 for constraining the shape of the slit bridging the inner wall of the slit 80 in the short side direction are provided on the upstream side thereof in the long side direction of the slit 80. They are integrally formed at intervals. That is, this reinforcement body 81
are arranged in parallel in a region approximately ⅓ of the middle of the nozzle body 16 in the direction of the flow path. The reinforcing body 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 reinforcing body 81 is set to be larger than the cross-sectional area of the slit 80.

According to this configuration, since a plurality of reinforcing bodies 81 are provided on the upstream side of the slit 89 to strengthen the inner wall of the slit 80 in the short side direction, the load in the width direction of the slit 80 is reduced by the pressing force of the molten metal 14. Even if the slit 80 acts, the reinforcing body 81 prevents the slit 80 from deforming. In addition, the reinforcement body 81 can withstand 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.
By providing this, it is possible to prevent thermal expansion and deformation of the slit 80 portion. 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 sulin 80 section, the slit gap will undergo an arch-shaped thermal expansion deformation that narrows the middle section. The compressive load can be supported by the reinforcing body 81 and such thermal expansion deformation can be prevented.

Note that the part of the nozzle body 16 where the reinforcing body 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 the case where simply increasing the wall thickness of the nozzle body causes large thermal expansion strain due to the temperature difference between the outer and inner surfaces of the nozzle body. This is because the heat is evenly heated, so no special thermal strain occurs due to the thick wall.

Moreover, according to the above configuration, since the total cross-sectional area of the flow path 82 on the upstream side partitioned by the reinforcing body 81 is set to be smaller than the cross-sectional area of the slit 80, the molten metal 14 flowing from this flow path 82 into the slit 80 is After the slit 80 is sufficiently filled, it is ejected. 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 to 50 mm.
When manufacturing μ plate material, conventional possible plate width dimensions (approximately 1
00mm), and it is also possible to set the plate width to approximately 1000m*.

In addition, although in the said Example, the reinforcement body 81 was formed integrally with the whole nozzle body 16, this invention is not necessarily limited to such a structure. That is, the nozzle body 16 is made up of a nozzle body divided structure vertically divided through the dividing plane along the long side direction of the slit 80, and the reinforcing body 81 is formed of one or more of the nozzle body divided structures. It is also possible to form both parts integrally or separately, and to tighten the nozzle body 16 from the outside at the reinforcing body part using a tool. For example, in FIGS. 9 to 11, two divided reinforcing bodies 81 are integrally formed on both of the two divided nozzle body divided structures 16a and 16b, and the nozzle body 16 is made elastic at the reinforcing body part. The body, for example a stacked leaf spring 83, is tightened by means of a bolt 84 and a nut 85, for example.

Even with this configuration, since the reinforcing body 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 failed example can be achieved. is the nozzle body 16 and the reinforcing body 81
Since the nozzle body 16 is divided into two parts as a whole, it has the advantage that the internal molding of the nozzle body 16 can be performed more easily than when it is integrally molded. In other words, the nozzle body is often constructed of a heat-resistant material that is relatively weak against deformation loads, and requires relatively careful machining such as cutting, so it is believed that such a configuration will facilitate machining. Become.

In the second embodiment, the elastic body 83 was interposed between the nozzle body 16 and the fittings 84 and 85 for tightening the nozzle body 16. Due to the difference in thermal expansion coefficient, the nozzle body 16 or the tightening tool 84
, 85 from being damaged, and if the nozzle body 16 and the tightening members 84, 85 have the same coefficient of thermal expansion, the elastic body 83 may be omitted. is also possible.

Further, FIGS. 12 and 13 show a third embodiment of the present invention. That is, in this embodiment, the reinforcing body 81 has an integral structure, and the nozzle body divided structure 16a is obtained by dividing the reinforcing body 81 into two parts.

16b, and is fastened together with tools 84 and 85 via an elastic body 83.

It goes without saying that with this configuration, almost the same effects as in the first and second embodiments can be achieved; The structure of the second embodiment also has the advantage of being easier to manufacture. Although not shown, it is of course possible to further divide the reinforcing body 81 in the case where the reinforcing body 81 is configured separately from the nozzle body 16.

14 to 16 show a fourth embodiment of the present invention. That is, in this embodiment, the upstream flow path 8 partitioned by the slit 80 and the reinforcing body 81
2 are arranged so as to partially overlap with each other, and the flow path 82 is made wide on the pool side and narrow on the slit side to increase the density of molten metal ejected from the slit 80. . According to such a configuration, the filling density of the molten metal ejected through the slit 80 can be made more uniform, and it can be made more effective in improving the plate thickness accuracy.

Note that the molten metal passing distance of the slit 80 is the same as that of the flow path 82.
The molten gold ingot flows into the slit 80 from the slit 80.
It is desirable to select and set the necessary and minimum dimensions that can be filled within 0.

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
In the width direction of the slit 80, the width becomes gradually narrower in the outflow direction, and conversely, the width becomes gradually wider in the long side direction of the slit 80, thereby giving characteristics to the flow state of the molten metal. It is. In other words, by passing the molten metal through the channel 82 whose cross-sectional shape changes in this way, the molten metal is more uniformly fed to the slit 80, and the channel 82 adjacent in the long side direction of the slit 80 is Adjacent portions of flowing molten metal can be effectively held in a state where they are not separated.

Furthermore, in the present invention, it goes without saying that the nozzle body 16 may be constructed integrally with the extraction pipe or the cover 12 of the water sump 11.

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. , the limitations on the width of the manufactured thin sheets were overcome by a reinforcing structure that is not affected by heat, and it became possible to manufacture thin sheets with extremely large sheet widths compared to conventional methods, making it possible to manufacture thin sheets. This has the practical effect of increasing the degree of dimensional freedom and achieving high dimensional accuracy.

[Brief explanation of the drawing]

1 to 4 show a conventional example, in which FIG. 1 is a cross-sectional view schematically showing a thin plate manufacturing apparatus, FIGS. 2 to 4 are bottom views showing different types of nozzle bodies, and FIG. Figures 5 to 18
The drawings show an embodiment of the present invention. Fig. 5 is a block diagram showing the entire thin plate manufacturing apparatus, Fig. 6 is an enlarged sectional view of the main part showing the first embodiment of the invention, and Fig. 7 is Fig. 6 is a sectional view taken along the line ■-■, Fig. 8 is an explanatory diagram showing the operation of the thin plate manufacturing apparatus, and Figs. 9--
Fig. 11 shows a second embodiment of the present invention, Fig. 9 is an enlarged sectional view of the nozzle body, Fig. 10 is a bottom view showing the entire nozzle body, and Fig. 11 is a side view of Fig. 10. , FIG. 12, and FIG. 13 show a third embodiment of the present invention.
The figure is an enlarged sectional view of the nozzle body, Figure 13 is a bottom view showing the entire nozzle body, Figures 14 to 16 show the fourth embodiment of the present invention, and Figure 14 is an enlarged view of the nozzle body. 15 is a sectional view taken along the line xv-xv in FIG. 14, FIG. 16 is a bottom view of FIG. 15, and FIGS.
FIG. 17 is an enlarged cross-sectional view of the nozzle body, and FIG. 18 is a cross-sectional view taken along the line xvm-X1 in FIG. 17. 20 River cooling body, 16... Nozzle body, 16a, 16b
... Nozzle body division structure, 80 ... Slit, 81
... Reinforcement body, 82 ... Channel, 11 ... Hot water pool, 8
4,85゜%6Ω 70th Sugar B Area 9th Kudzu 70th Toshi 120 Part 73 Reward

Claims (1)

[Scope of Claims] 1. A molten metal spouting nozzle for a thin plate manufacturing apparatus that continuously spouts molten metal from a sump to a moving cooling body through a slit at the tip of the nozzle body, wherein the nozzle body A molten metal for a thin plate manufacturing apparatus, characterized in that a plurality of reinforcing bodies for constraining the shape of the slit bridging the inner wall in the short side direction of the slit are provided at intervals in the long side direction of the slit on the upstream side of the slit. Spout nozzle. 2. A molten metal spouting nozzle for a thin plate manufacturing apparatus according to claim 1, wherein the reinforcing body and the nozzle body are integrally constructed. 3. The nozzle body consists of a nozzle body divided structure vertically divided through a dividing surface along the long side direction of the slit, and the reinforcing body is integrated with or separate from one or both of the nozzle body divided structures. 2. A molten metal spouting nozzle for a thin plate manufacturing apparatus according to claim 1, wherein the nozzle body is joined from the outside at a reinforcing body portion with a tool. 4. The molten metal spouting nozzle for a thin plate manufacturing apparatus according to claim 3, wherein the tightening is performed by a tool tightening the nozzle body through an elastic body. 5. A molten metal spouting nozzle for a thin plate manufacturing apparatus according to any one of claims 1 to 4, characterized in that the nozzle body is formed integrally with a sump. 6. The thin plate according to any one of claims 1 to 4, characterized in that the nozzle body is separate from the sump and is fastened to the sump by a tool. Molten metal spout nozzle of manufacturing equipment. 7. Melting of the thin plate manufacturing apparatus according to any one of claims 1 to 6, characterized in that the total cross-sectional area of the upstream portion partitioned by the reinforcing body is larger than the cross-sectional area of the slit. All-island jet nozzle.