JPS6340626B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a cooling roll used when manufacturing a quenched ribbon by a twin roll method and a method of using this cooling roll to control sheet thickness. It is something.

(Prior art) In general, there are two methods for producing a quenched ribbon using a molten metal quenching method: a single roll method and a twin roll method.
As shown in Figure a, the twin roll method is one in which a molten metal 1 is continuously supplied to the surface of a roll 2 rotating at high speed through a pouring nozzle and rapidly solidified to obtain a ribbon 3.

When manufacturing ribbon using this twin-roll method, a heat crown (difference in thermal expansion in the roll width direction) occurs as the roll surface temperature rises, resulting in a roll gap difference in the width direction as shown in Figure 4b. Not only does the thickness of the strip become uneven, but in some cases breakout occurs as shown in Figure 4b due to the generation of unsolidified shells, making it impossible to obtain a ribbon with a uniform thickness and good shape. There were flaws.

(Problems to be Solved by the Invention) In order to eliminate the above-mentioned drawbacks, cooling rolls as shown in FIGS. 5a and 5b have been proposed. The hollow sleeve roll shown in FIG. 5a is composed of a thin sleeve portion 4 in which cooling water 5 is circulated to prevent heat crown from occurring due to heat. In addition, the distribution shape sleeve roll shown in Fig. 5b is one in which the thickness of the sleeve 4 is distributed in the lengthwise direction of the roll body in order to reduce the heat crown in the central part, and the central part is distributed at both ends. It has a relatively thick structure.

The cooling roll with the above-mentioned configuration can certainly suppress the occurrence of heat crown compared to a roll without cooling means, but it is possible to suppress the occurrence of heat crown, but it is also
This was not sufficient to obtain a ribbon with a good shape, and it was necessary to develop a roll that was even more free from heat crown.

The object of the present invention is to provide a cooling roll for producing a quenched ribbon, which eliminates the above-mentioned drawbacks, and which can always obtain a ribbon of uniform thickness and good shape regardless of the temperature of the roll, and a method of using the same. This is what we are trying to provide.

(Means for Solving the Problems) The cooling roll for producing a quenched ribbon of the present invention is a roll equipped with a cooling sleeve having a space for circulating cooling water, and a hydraulic sleeve is provided between the cooling sleeve and the roll shaft. This is characterized in that a hydraulic space is provided within the hydraulic sleeve near a position corresponding to the base on the roll axis side of the side wall of the cooling sleeve forming the space.

Furthermore, the method of using the cooling roll of the present invention includes a sleeve having a space for circulating cooling water, and a hydraulic space in the vicinity of a position corresponding to the base on the roll axis side of the sleeve side wall constituting the space, and rotating at high speed. The thickness of both ends of the ribbon manufactured by supplying molten metal from a pouring nozzle to the entire width between two cooling rolls is measured, and the hydraulic pressure is adjusted based on the feedback value calculated in the control device according to the measured value. This method is characterized in that the thickness of the ribbon is controlled by increasing or decreasing hydraulic pressure in the space used, and pressing down both ends of the ribbon between the cooling rolls.

(effect) The present invention will be described in detail below with reference to the drawings.

FIG. 1 is a diagram showing an example of a roll for producing a quenched ribbon according to the present invention. In FIG. 1, the wall thickness of the sleeve 4 is determined by the outside diameter of the roll, rolling force, roll material, heat load, etc. as a result of various experiments, and is defined as shown in equation (1) below.

y= _y0 − _C0x ⁻ _C1x2 (0≦x≦L/2) ……(1) Here, y: Sleeve thickness (mm), _y0 : Critical sleeve thickness (sleeve center thickness) ( mm), x: Roll body length position (mm), L: Roll body length (mm), C ₀ ,
C ₁ : A constant determined by roll diameter, roll rolling force, roll material, heat load, etc.

Further, the cooling sleeve 4 of the present invention has a hydraulic groove 8 in its lower part, and is configured to roll the ribbon at the roll edge portion. That is, the hydraulic sleeve 7 is provided as a double sleeve below the cooling sleeve 4, and each sleeve 4, 7 is fixed to the roll shaft 6 by shrink fitting.

FIG. 2 is a diagram for explaining a method of controlling the plate thickness using the cooling roll of the present invention.
In FIG. 2, first, the thickness shape of the ribbon 3 is constantly measured using a thickness measuring device 9 such as a gamma ray thickness meter, and the measured value is supplied to the control device 10. Control device 10
Then, the increase or decrease in the hydraulic pressure supplied to the hydraulic groove 8 of the hydraulic sleeve 7 is calculated and determined according to the supplied measured value of plate thickness, and the result is supplied to the hydraulic units 11 and 12 as a control signal. In other words, when the hydraulic pressure feedback amount is ΔP, the plate thickness deviation (measured value - set value) is ΔH, and ΔP=αΔH (α: constant),
If the deviation ΔH is positive, that is, both ends are too thick, increase the hydraulic pressure by ΔP, and if the deviation ΔH is negative, that is, both ends are too thin, increase the hydraulic pressure by ΔP.
Hydraulic unit 1
1 and 12. Hydraulic unit 11,1
At step 2, the hydraulic pressure to be supplied to the hydraulic groove 8 is increased or decreased based on the supplied control signal, and the edge portion of the ribbon is rolled to control the thickness and prevent breakout. The roll internal pressure circuit is connected to external hydraulic units 11 and 12 via a rotary joint (not shown).

(Example) When a quenched ribbon was produced by the twin roll method using the conventional cooling roll shown in FIG. 4b and the cooling roll of the present invention shown in FIG. (difference in plate thickness between edge and edge), plate width W and hydraulic pressure P
We compared the changes in FIGS. 3a and 3b are graphs showing the results when using the cooling roll of the present invention and the conventional cooling roll, respectively.

According to the conventional cooling roll shown in FIG. 3b,
As the casting time increased, the central part of the plate became thinner than the edges, and the deviation in plate thickness also increased. Along with this, breakouts also occurred at the roll edges, and the board width became extremely narrow. On the other hand, according to the roll of the present invention shown in FIG. 3a, the thickness deviation is small and breakout at the roll edge is prevented, making it possible to continuously produce ribbons with good shapes. Ta.

As a specific example, when 1 ton of 3 to 6% Si-Fe alloy is continuously cast in a heat size by the twin roll method, the hydraulic compression sleeve roll shown in FIG. Maximum 200Kg/
When a thin strip was produced by rolling both edges of a strip with a thickness of 300 μm and a width of 300 mm at ^cm2 , the thickness deviation was 10 μm.
We were able to keep it within m. At this time, the roll material used was copper alloy (Cu-Be, Cu-Cr, etc.), the critical sleeve thickness was 10 mm, the roll circumferential speed was 5 m/sec,
The outer diameter of the roll was 500 mmφ.

The present invention is not limited only to the embodiments described above, and numerous modifications and changes are possible. For example, as the hydraulic reduction sleeve roll of the present invention,
A hydraulic space may be provided near the base of the side wall of the cooling sleeve between the cooling sleeve and the roll shaft without using the hydraulic sleeve. Further, in this embodiment, one plate thickness measuring device is provided at one end of the ribbon, but two devices may be provided, one at each end, to control the sleeve at each end.

(Effects of the Invention) As is clear from the above detailed explanation, according to the cooling roll for producing quenched ribbon and the method of using the same of the present invention, a cooling roll having a hydraulic space near the base of the sleeve is used to thin the ribbon. By applying hydraulic pressure corresponding to the thickness during the manufacturing of the ribbon, both edges of the ribbon are rolled down to create the ribbon, resulting in good contact between the ribbons on the rolls and improved heat transfer. At the same time, the surface temperature of the produced ribbon is lowered and the surface roughness of the ribbon is improved. Therefore, it is possible to obtain a ribbon with a uniform thickness and good shape without breakouts.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an example of a cooling roll for manufacturing a quenched ribbon according to the present invention, FIG. Figures 3a and 3b are graphs showing the results when using the cooling roll of the present invention and a conventional cooling roll, respectively, and Figures 4a and 4b illustrate an example of a method for producing a quenched ribbon using the conventional twin roll method. Figures 5a and 5b are diagrams showing an example of a conventional hollow sleeve roll and a distributed sleeve roll, respectively. 1... Molten metal, 2... Cooling roll, 3... Thin strip, 4... Cooling sleeve, 5... Cooling water, 6...
Roll shaft, 7... Hydraulic sleeve, 8... Hydraulic groove, 9... Plate thickness measuring device, 10... Control device, 1
1, 12... Hydraulic unit.

Claims (1)

[Claims] 1. In a roll equipped with a cooling sleeve having a cooling water circulation space, a hydraulic sleeve is provided between the cooling sleeve and the roll shaft, and the cooling sleeve side wall constituting the space corresponds to the base on the roll axis side. A cooling roll for producing quenched ribbon, characterized in that a hydraulic space is provided in a hydraulic sleeve near a position where a hydraulic pressure is applied. 2. Equipped with a sleeve having a cooling water circulation space,
A hydraulic space is provided near a position corresponding to the roll axis side base of the sleeve side wall constituting the space, and molten metal is supplied from a pouring nozzle to the entire width between two cooling rolls that rotate at high speed. The thickness of both ends of the thin strip is measured, and according to the measured value, the hydraulic pressure is increased or decreased in the hydraulic space based on the feedback value calculated in the control device, and the both ends of the thin strip are moved between the cooling rolls. A method of using a cooling roll for producing a quenched ribbon, which is characterized by controlling the thickness of the ribbon by rolling it down.