JPS5887231A - Method and device for continuous hardening of steel plate - Google Patents

Abstract

PURPOSE:To make the construction of a device simple and to make the cooling functions on the top and bottom surfaces of a steel plate and in its transverse direction uniform in a method of passing the steel plate into a water storage tank by supplying and discharging the cooling water in the parts upper and lower than the steel plate in the water storage tank from the upper and lower parts of the tank. CONSTITUTION:A steel plate 12 is moved in a direction C by the revolutions of rolls 16, 18, and cooling water is fed forcibly into a water storage tank 10 through main water supply pipes 64, 66 from a water supply source. Vane wheels 32, 34 are rotated and the hardening work is carried out. The rolls 16, 18 make the flow of the cooling water symmetrical on the top and bottom of the plate 12. The cooling water mainly on the upper side than the plate 12 is supplied through a pipe 64, water supply branches 60 and the water feed port 89 of a ceiling plate 80 and is agitated by the rotation of the wheels 32. At the same time, said water cools the top surface of the plate 12 and is discharged and circulated through the overflow port 82 of the plate 80 in a direction N. On the other hand, the cooling water mainly in the lower part than the plate 12 is supplied through a pipe 66, water supply branch 62 and the feed port 89 of a bottom plate 81 and is discharged and circulated through the discharge port 83 of the plate 81 and a gate 83 in the same manner as mentioned above. Thus the flow in the vertical direction in the tank 10 is prevented and the top and bottom surfaces of the plate 12 are cooled uniformly.

Description

Detailed Description of the Invention The present invention relates to a method and apparatus for continuous quenching of a steel plate in which the steel plate is passed through a cooling tank and quenched continuously.K increases the relative speed between the surface of the steel plate and the cooling water. There is a need to. For this reason, conventionally, a cooling means has been employed in which pressurized cooling water is injected from a nozzle and collides with the narrow surface of the steel plate.

However, with this cooling method, in some cases, the equipment for pressurizing the cooling water is large and the amount of cooling water used is enormous.

. A, Yakikuoki, 8 expensive A, and A have the problem of increasing Km conversion costs. Furthermore, as the amount of cooling water used increases, the water supply piping becomes thicker, which occupies a larger space, and the height and length of the quenching equipment need to be increased. It is necessary to reinforce the frame, etc., which has a large internal weight. In addition to this, the pitch between the parallel pipes becomes large, making it difficult to increase the jet water flow density, and the cooling capacity must be reduced. Further, the holes in the cooling water nozzle cause non-uniform hardening, and the time and cost required to remove hardening increases.

In order to eliminate these drawbacks, the inventor first developed a water tank through which a steel plate passes to be cooled, and a system in which cooling water is provided in the water tank and is moved in the direction of movement of the steel plate or in the opposite direction to the direction of movement of the steel plate. Invented a continuous firing system for steel plates with an impeller and applied for a patent. (脣JII!l 1977-167102) In the quenching apparatus according to the present invention, as shown in FIGS. The impeller box is rotated, thereby stirring and moving the cooling water, and the cooling water is directly supplied from the water supply branch pipes 60, 62 and the water supply main pipes 64, 66 respectively provided in the impeller box. Further, as shown in FIG. 2, this cooling water moves around the rolls 16 and 18 in the direction of M, that is, the width direction of the steel plate 12, and moves as shown by the arrow N.
As shown in the figure, water is discharged from the side wall of the water tank 10 to the autosafe 0-.

However, in this quenching equipment, main water supply pipes 64° 66 and water supply branch pipes 60, 62 are provided in each impeller box, so although this is an improvement over the conventional system, the structure of the entire equipment is still complicated and It becomes expensive. In addition, there is a possibility that the cooling water flows in the width direction of the steel plate 12 (arrow M), and therefore uniform cooling cannot be performed in the width direction of the steel plate 120. In addition, since all the water supplied to the water tank 10 overflows and is discharged from the side wall of the water tank 10, a flow of cooling water is generated in the vertical direction inside the water tank 10, and the upper two surfaces of the steel plate 12 and There is a risk that the bottom surface will not be cooled uniformly.

The present invention addresses these problems and aims to further simplify the structure of the device, prevent the overall size of the device from increasing, and make the cooling function uniform on the upper and lower surfaces of the steel plate and in the width direction of the steel plate. It is something.

To achieve the above object, the present invention provides a method for continuous quenching of steel plates in which the steel plates are passed through a water tank and continuously quenched. The cooling water below the steel plate of the water tank is supplied from the bottom of the water tank and also discharged, so that the cooling water in the water tank is
The upper part of the steel plate is circulated on this upper side, and the lower part of the steel plate is circulated on this lower side, thus preventing the cooling water from collapsing above and below the steel plate and moving in the vertical direction. ing. The present invention further detects a vertical flow of water in the cooling water storage tank, and adjusts the amount of cooling water supplied and discharged to prevent the cooling water from flowing vertically. be.

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

As shown in FIG. 3, rectangular openings 14 are provided at both ends in the longitudinal direction of the continuous sintering water storage tank 10 according to this embodiment, and serve as entrances and exits for the steel plate 12.

Outside the water storage tank 10, water supply pipes 74 are arranged above and below the steel plate 12, corresponding to the openings 14 that are the entrances and exits of the steel plate.

These water supply pipes 74 are parallel to the main water supply pipe 64, and are connected with slit nozzles 76 so as to jet pressurized water 78 from a water supply source (not shown) toward the opening 14.

Inside the water storage tank 10, as shown in FIG. 4, a plurality of upper rolls 16 and a plurality of lower rolls 18 are arranged at appropriate intervals), and both ends are supported by bearing devices 20 and 22, respectively.
It is pivoted. The axes of these rolls 16 and 18 are horizontal and are arranged in a direction perpendicular to the longitudinal direction of the water tank 1o. These rolls 16, 18
-1ml passes through the bearing device 20.22 and enters the water tank 1o.
The shaft protrudes to the outside and is connected to prime movers 28,30 via joints 24,26, and these prime movers allow roll 1 to be
6.18 are each rotated. The direction of rotation is such that the upper roll 16 and the lower roll 18 are rotated in opposite directions (in the direction of arrow AB in FIG. 3), and the steel plate 112 is sandwiched between both rolls and the steel plate 12 is moved in the longitudinal direction of the water tank. It says K to move to. (Direction of arrow O in Fig. 3) Between these plurality of upper rolls 16 and lower roll 1! Impellers 32 and 34 are pivotally supported between them, and their axes are parallel to the axes of the rolls 16 and 18, respectively. These impellers 32, 34 have four blade plates 40 protruding from the outer periphery of the rotating shaft 36, 38 at equal intervals in the radial direction, as shown in FIG. Board 40
The distance between the steel plate 12 and the surface of the steel plate 12 is set to be less than several tens of square meters, thereby eliminating uneven firing caused by the cooling water 42 moving in the axial direction of the impeller, that is, in the direction across the width of the steel plate being conveyed. There is.

The rotation shafts 36 and 38 of these impellers 32 and 34 are the fifth
As shown in the figure, they are each supported by bearing devices 44 and 46, and one end of the rotating shaft passes through these bearing devices and projects to the outside of the water tank 10. This protruding one-turn shaft end is connected to a prime mover 52.54 via a joint 48.50, and the driving force of these prime movers drives an impeller 32.3.
4 are arranged so that they are each rotated. This rotation direction is such that the impeller 32 disposed at the upper roll 16 is opposite to the rotation direction of these upper rolls (in the direction indicated by the arrow).
The impeller 34 arranged between the lower rolls 180 rotates in a direction opposite to the rotation direction of these lower rolls 18 (in the direction of arrow E).

In other words, the rotation of these impellers causes the impeller and steel plate 1 to
The cooling water between 2 and 2 is in the actual feeding direction of the steel plate 12 (arrow 0 direction)
K is set so that it moves in the opposite direction. Also, the outer peripheral speed of these impellers 32°34 is 2 relative to the steel plate.
The S power of the prime mover 52,54 is set so that the speed is higher than 1/sec.

An impeller guide P90°91 having an arc-shaped cross section is provided at the upper part of the impeller 32 and the lower part of the impeller 34, respectively, and is fixed to the ceiling plate 80 and the bottom plate 81 of the water tank 10, respectively. 91 is the cooling water impeller 32,3
4 and thus impeller 32.3
4 rotates, the cooling water is efficiently stirred. A steel plate 12 is provided on the ceiling plate 80 and the bottom plate 81.
0 Multiple water supply branch pipes in a row in the width direction 60° 62
One end of the ceiling plate 80. The bottom plate 81 is communicated with the inside of the water tank 10 through water supply ports 89 and 89 respectively provided in the bottom plate 81 . The other ends of these water supply branch pipes 60.62 are connected to one water supply main pipe 64.66, respectively.
These main water supply pipes are connected to a cooling water supply source via respective flow rate control valves (not shown). Therefore, water supply branch pipe 6
0°62 is designed to forcefully feed cooling water from a water supply source to the water storage tank 10, but the size of the main water supply pipes 64°66 and the number of water supply branch pipes 60, 62 are uniform in the width direction of the water storage tank 100. Cooling water is supplied to produce uniform cooling without unevenness in the width direction of the steel plate, and the temperature is increased to a level that does not interfere with baking. Also, the cooling water pressure is 0.5kg
/aA is sufficient.

Further, the ceiling plate 8o of the water tank 10 is provided with overflow ports 82 having a constant area of Pfr evenly in the width direction of the water tank 1o at appropriate locations, and the cooling water flows from the overflow ports 82. It is designed to overflow upwards. Both side walls 86 of the water storage tank 100 extend above the ceiling plate 80, thereby forming a portion above the ceiling plate 80. . Lines 1. As shown in FIG. 4, drains j185 and 85 are formed, and the cooling water overflowing from the overflow port 82 is discharged from these drain windows 85 and 85 to both sides as indicated by arrows N. ing.

The bottom plate 81 of the water tank 10 is provided with drain ports 88 at appropriate locations, particularly in the width direction of the water tank 10, and a gate 83 is provided in the drain port 88 to adjust the opening area of the drain port 88. It is being More specifically, the gate 83 is provided to protrude downward from the drain port 88 and
The adjusting plate 84 has the same size and the same spacing as the adjusting plate 84 and is slidable therein. Therefore, by sliding the adjustment plate 84, the opening area of the drain port 88 can be made uniform in the width direction of the water tank 100.

One end of the adjustment plate 84 extends outward through one side wall 86 of the water tank 10 and is connected to a drive device 102 that slides the adjustment plate 84. This drive device 102 is connected to the water flow detector 1 via an electrically connected controller 101.
00. The water flow detector 100 penetrates the side wall 86 of the water storage tank 10 and is located at a position on the side of the steel plate 120, that is, approximately in the vertical center of the water storage tank 1G. The flow is detected and the drive device 102 is controlled. Note that the desired effect can be obtained by providing the water flow detector 100 at at least one location, but if the number of water flow detectors 100 is increased as appropriate, control with higher precision becomes possible.

(9) The controller 101 is connected to flow rate control valves (not shown) of the main water supply pipes 64 and 66, respectively, so that the amount of water supplied can be controlled differently.

Next, to explain the operation, the steel plate 12 is moved in the direction of the arrow 0 by driving the prime mover 28, 30, and the main water supply pipe 64, 66 and the water supply branch pipes 60, 62 are connected to the water supply source (not shown) from the water supply source (not shown).
There are no rolls on the steel plate 12 during the rotation of the cold four-wheel 16,1g into the water storage tank 10.These rolls also have the function of making the flow of cooling water symmetrical above and below the steel plate 12. .

The cooling water mainly on the upper side of the steel plate 12 is supplied through the upper water supply main pipe 64, the upper water supply branch pipe 60, and the water supply port 89 of the ceiling plate 80, and is stirred by the rotation of the impeller 32. The upper surface of the steel plate 12 is cooled, and the water overflows from the overflow port 82 of the ceiling plate 80 above the ceiling plate 8°, and the drain window 8
5 to be discharged as shown by the arrow N and then circulated. On the other hand, the cooling water mainly below the steel plate 12 is supplied to the main lower water supply pipe 66, the lower water supply branch pipe 62. Water is supplied through the water supply port 89 of the bottom plate 81, is stirred by the rotation of the impeller 340, cools the lower surface of the steel plate, and is discharged through the drain port 88 of the bottom plate 81 and the gate 83] circulate. Therefore, as a unit, the cooling water on the upper side of the steel plate 12 is circulated only in the upper side, and the cooling water on the lower side of the steel plate 12 is circulated only in the lower side, and the cooling water in the upper and lower parts of the cooling water storage tank 10 is circulated only in the upper side. Substantial flow in the direction, that is, the vertical direction, can be prevented, and a uniform cooling function can therefore be ensured on the upper and lower surfaces of the steel plate.

Here, since the cooling water may substantially flow vertically in the water storage tank 10 depending on the amount of cooling water supplied and discharged,
A water flow detector 100 is provided to detect this. For example, if the water flow detector 100 detects a downward flow of cooling water in the water storage tank 10, it is determined that a phenomenon in which the amount of water discharged from the lower part is larger than the amount of water supplied to the lower part is occurring. Therefore,
In this case, either the flow control valve of the lower main water supply pipe 66 is controlled via the control 6101 to increase the lower water supply amount, or the drive device 102 is controlled to slide the gate 83 and the drain port 88
Adjust the opening area to reduce the amount of drainage at the bottom. In this case, the lower water supply amount and the lower drainage amount are equal to each other, and the water tank 1 described above is
Prevent downward flow of cold water in G. Note that the downward flow of cooling water occurs when the upper water supply amount exceeds the upper drainage amount. It is also possible to eliminate this downward flow of cooling water by reducing it.

Conversely, if the water flow detector 100 detects an upward flow of cooling water in the water storage tank, it is determined that a phenomenon opposite to the above-mentioned phenomenon is occurring, and the drain port 88 by the gate 83 is detected.
Either increase the lower drainage volume by adjusting the opening area of the lower water supply pipe, or decrease the lower water supply volume by adjusting the flow rate control valve of the lower water supply main pipe, or adjust the flow rate control valve of the upper water supply main pipe to increase the lower water supply volume. Increase the water supply section. However, the amount of water supplied is directly related to the cooling capacity of the steel plate, and must be determined preferentially depending on the size or type of steel plate. Therefore, in the operation to eliminate the vertical flow of cooling water, priority is given to adjusting the opening area of the drain port 88 by the gate 83.

In addition, as shown in Fig. 6, one cooling water has an impeller of 32°34
Due to the rotation of the steel plate 120, the steel plate 120 is stirred in a trajectory shown by arrows J, H, and moves in a direction opposite to the moving direction of the steel plate 12 on the surface of the steel plate 120. Here, one impeller guide 90.91 is different from the impeller box 56°58 in FIG.
The area covering the outer periphery of the steel plate is small, so the flow of cooling water is smooth, and the cooling water that has been supplied and the cooling water that has taken away the heat from the steel plate is mixed efficiently, improving the overall cooling capacity. do. Therefore, the necessary cooling capacity can be maintained without providing the same number of main water supply pipes as the number of impellers as shown in FIG. The structure of the entire device can be simplified.

Further, the cooling water is discharged through an overflow port 82 and a drain port 88 provided in the ceiling plate 80 and bottom plate 81 of the water storage tank 10, respectively. Since the cooling water is provided at equal intervals in the width direction of the water storage tank 100, the cooling water flows into the water storage tank 1.
0, no flow occurs in the width direction of the steel plate, and therefore cooling can be made uniform in the width direction of the steel plate.

As described above, according to the present invention, the cooling water in the water tank does not substantially flow in the vertical direction of the water tank and in the width direction of the steel plate, so that the quenching by cooling the steel plate can be uniformly performed on the entire steel plate. This has the excellent effect of making it possible to obtain heat-treated steel sheets of extremely high quality. Further, according to the present invention, the structure of the device can be simplified, and the cost of the device can thereby be reduced.

[Brief explanation of the drawing]

Figure 1 shows steel plate 4!5 for which we have already applied for a patent! FIG. 2 is a sectional view taken along the line ■-■ in FIG. The figure is a sectional view taken along the fV-fV line in Fig. 3, Fig. 5 is a sectional view taken along the ■-v line, and Fig. 6 is an enlarged sectional view showing the impeller and its surroundings in Fig. 3. . 10... Water tank, 12... Steel plate, 16.18...
roll. 3, 2, 34... Impeller, 64.66... Main water supply pipe, 80... Ceiling plate, 81... Bottom plate, 82... Overflow port, 83... Gate, 88...・Drain port. Agent Tatsuyuki Unuma (and 2 others)

Claims (4)

[Claims] (1) In the #Ii continuous quenching method, in which a steel plate is passed through a water tank, cooling water in the tank is continuously supplied and drained, and the water is moved at a constant relative speed to the steel plate. A steel plate continuous quenching method in which cooling water for the upper part of the steel plate is supplied and discharged from the upper part of the water storage tank, and cooling water for the lower part of the steel plate from the water storage tank is supplied and discharged from the lower part of the water tank. (2) The vertical flow of cooling water in a water storage tank is detected, and the amount of supply and drainage of cooling water is adjusted to control the cooling water so that it does not substantially move in the vertical direction. 1. Continuous quenching method for steel sheets as currently described. (3) The method for continuous quenching of a steel plate according to claim 2, wherein the cooling water is controlled so that it does not substantially move in the vertical direction by adjusting the amount of cooling water discharged from the lower part of the water storage tank. . (4) A continuous steel plate in which steel eta is placed inside a water storage tank, an impeller is provided in the water tank, and the rotation of the impeller moves cooling water on the surface of the steel plate at a constant relative speed to the steel plate. Along with the quenching equipment, the ceiling plate of the water tank is provided with a cooling water supply opening and a discharge opening, and the bottom plate of the water tank is provided with a cooling water supply opening and a discharge opening whose opening area can be adjusted. The cooling water in the upper part of the water tank is supplied from the supply opening in the ceiling plate and is also discharged and circulated through the discharge opening in the ceiling plate, and the cooling water in the lower part of the water tank is circulated through the supply opening in the bottom plate. A continuous steel plate quenching apparatus, in which the steel plate is supplied through a discharge opening and is discharged through a discharge opening in the bottom plate for circulation.