JPS60244411A - Cooling device of hot rolling mill - Google Patents

Abstract

PURPOSE:To prevent surely the over-cooling of the front and rear end parts of a rolling material by controlling the cooling water splashing on a rolling material by the direction change of a header in the cooling device equipped with a roll coolant header cooling a rolling roll and a rolling cooling header cooling a rolling material. CONSTITUTION:A variable mechanism 8 of the direction of a header controlling the cooling water splashing on a rolling material 4 is provided to both rolling cooling headers 6, 6' or rolling headers 6, 6' and roll coolant headers 5, 5' in a hot rolling mill equipped with headers 5, 5', 6, 6'. Front and rear ends detectors 9, 10 detecting the tip part and rear end part of the rolling material 4 and operating the header variable mechanism 8 as of a cooling water controlling means by the detecting signal thereof so as to avoid over-cooling of the tip and rear end parts of the rolling material 4 are also provided.

Description

[Detailed description of the invention] The present invention relates to a cooling device for a hot rolling mill.

Conventionally, when rolling low-temperature materials, special materials, etc. with a hot rolling mill,
It is common practice to cool both the rolling roll and the rolled material by spraying cooling water on them, but the rolled material (rolled plate) has a central part surrounded by the leading and trailing ends and both sides in the horizontal direction of the plate. If these parts are cooled more easily than other parts, if all these parts are cooled with water under the same conditions, the plate edge parts that are easy to cool (in the range of 200 to 300 IMn) will reach the specified cooling end temperature (600 to 800 °C in the case of low-temperature materials and special materials). ), which causes the problem of edge supercooling (temperature drop).

This edge supercooling becomes a problem especially in the case of two-stage rolling at the leading edge and trailing edge in the horizontal direction of the plate, and the load output chart in the latter stage of rolling becomes extremely high at the leading edge and trailing edge of the plate where the temperature has dropped. This caused uneven rolling.

This invention was made in view of the above circumstances,
The object thereof is to provide a cooling device for a hot rolling mill that can prevent a drop in temperature (overcooling) at the leading and trailing ends of a rolled material.

Hereinafter, one embodiment of the present invention apparatus will be described in detail with reference to the drawings. In the drawing, 1 is a housing of a hot rolling mill, 2 is a rolling roll,
3 is a backup roll, 4 is a rolled material, 5, 5- is a pair of front and rear roll headers that cool the upper rolling roll 2 with water spray, and 6.6' is a pair of front and rear roll headers that cool the rolled material 4 by spraying cooling water on it. Showing cooling header.

Therefore, the present invention provides a header 5°5-. 6.
In the known hot rolling mill equipped with 6", the rolling cooling header 6, 6' or both the rolling cooling header and the roll crand header 5° 5- are provided as means for controlling the cooling water applied to the rolled material 4. In addition to providing the header direction variable mechanism 8 shown in FIG.
and the rear end portion 4b, and this detection signal causes the header variable mechanism 8 as a cooling water control means to be controlled so that the front and rear end portions of the rolled material 4 do not get too cold, that is, the tip portion 4a of the rolled material 4.
The apparatus is characterized in that it is provided with front and rear end detectors 9 and 10 which are operated in conjunction with each other so that the temperature of the rear end portion 4b does not fall below a predetermined cooling end temperature.

Next, we will explain in detail the structure shown in FIG. 2 which changes the water spraying direction of the header back and forth as a cooling water control means. A variable header mechanism 8 which is rotatably supported, has a rotating arm 15 fixed to the shaft end of the header, and has a fluid pressure cylinder 16 connected to the arm end to rotate the header 6.6- within a certain angle range. The front and rear ends of the rolled material 4 are detected by a detector 9.10, and the direction of the rolling cooling header 6.6' is changed back and forth when the leading end 4a and rear end 4b of the rolled material 4 pass. I try to let them do it.

The variable operation of this rolling cooling header 6.6- is shown in FIGS. 2 to 6. First, when the rolled material 4 is transferred to the header position in front of the O-ru, its tip 4a is detected. The cylinder 16 is moved forward by this detection signal, and the rolling cooling header 6 is instantaneously rotated in the direction of the arrow in FIG. It will now be sprayed diagonally and diffusely. Therefore, in this case, the amount of cooling water applied to the tip of the rolled material decreases, and the tip of the rolled material is only slightly cooled and is caught between the rolling rolls 2, where the roll is closed. The cooling header 6 is returned to the downward injection state as shown in FIG. When the tip end portion 4a of the rolled material reaches the roll rear header 6-, the cooling water is also obliquely injected into the cooling header 6- to a position avoiding the tip portion 4a of the rolled material. It rotates as shown in FIG. 4, and after the tip of the rolled material has passed, the direction is changed again to the normal cooling state as shown in FIG. 5.

The rolled material 4 is rolled in the state shown in FIG. The rear end is detected, and the rolling cooling header 6 is changed direction again as shown in FIG. 6, and then the cooling header 6' on the rear side of the roller is also turned away from the rear end of the rolled material in the same manner as in FIG. The direction is changed to a state where

By changing the direction of the headers 6 and 6' as described above, the temperature of the front and rear end portions 4a and 4b of the rolled material 4 is reduced (appropriate cooling fill).
prevent.

Since the hot rolling mill cooling device of the present invention is as described above, by controlling the cooling water applied to the rolled material by changing the direction of the header, the problem of supercooling (temperature drop) at the leading and trailing ends of the rolled material can be solved. It has the effect of reliably preventing this.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of the configuration of a hot rolling mill equipped with the device of the present invention, Fig. 2 is a perspective view showing a unidirectional header variable mechanism of the rolling mill, and Figs. FIG. 6 is an operation explanatory diagram sequentially showing conversion states. DESCRIPTION OF SYMBOLS 1...Housing, 2...Rolling roll, 3...Backup roll, 4...Rolling material, 5.5'...Roll crank header, 8...Header variable mechanism, 9
．． 10...Top/rear end detector. Applicant's agent Patent attorney Takehiko Suzue/&3 Figures

Claims (2)

[Claims] (1) In a cooling device for a hot rolling mill that is equipped with a roll coolant header that cools the rolling rolls and a rolling cooling header that cools the rolled material, the watering direction of at least the rolling cooling header among the headers can be changed back and forth. and a leading and trailing end detector that detects the leading and trailing ends of the rolled material and variably rotates the direction of the header based on the detection signal so as to prevent a temperature drop at the leading and trailing ends of the rolled material. A cooling device for a hot rolling mill, characterized in that it is provided with a cooling device for a hot rolling mill. (2) The mechanism for variably rotating the direction of the header back and forth based on the signal from the front and rear end detectors involves attaching a rotating arm to the shaft end of the header that is rotatably supported by a bearing, and rotating this rotating arm at an angle using a hydraulic cylinder. The cooling device for a hot rolling mill according to claim 1, characterized in that the cooling device is configured to rotate.