JPS6161883B2 - - Google Patents

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. in a hot rolling mill, cooling water is usually applied to both the rolling roll and the rolled material, but the rolled material (rolled plate) is The leading and trailing edges and both sides in the longitudinal direction are more easily cooled than the central part surrounded by these edges, so if these parts are all cooled with water under the same conditions, the edge parts (200 to 300 mm range) that are easy to cool will be The problem of edge supercooling (temperature drop) occurs, where the temperature drops below a predetermined cooling end temperature (600 to 800°C for low-temperature materials and special materials). This edge supercooling becomes a problem especially when the leading edge and trailing edge of the plate in the longitudinal direction are subjected to two-stage rolling, and the load output chart in the later 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, and its purpose is to provide cooling for a hot rolling mill that can prevent temperature drop (supercooling) at the leading and trailing ends of rolled material. The aim is to provide equipment.

Hereinafter, one embodiment of the apparatus of the present invention will be described in detail with reference to the drawings.
1 is a rolling roll, 3 is a back-up roll, 4 is a rolled material, 5, 5' is a pair of front and rear roll crank headers for cooling the upper rolling roll 2 with water, 6, 6'
1 shows a pair of front and rear rolling cooling headers that cool the rolled material 4 by spraying cooling water thereon. Therefore, the present invention provides a known hot rolling mill equipped with the headers 5, 5', 6, 6' as described above, and the rolling cooling header 6, 6' or the rolling cooling header and the roll crant header 5, Rolled material 4 on both 5'
As a means for controlling the cooling water, an opening/closing type shielding plate 7 shown in FIG. The front and rear ends of the shielding plate 7 are operated in conjunction with each other to prevent the front and rear ends of the rolled material 4 from becoming too cold, that is, to prevent the temperature of the leading and trailing end portions 4a and 4b of the rolled material from falling below a predetermined cooling end temperature. This device is characterized by being provided with detectors 9 and 10.

The cooling device shown in FIG. 1, which is equipped with an openable/closable shielding plate 7 as the cooling water control means, has a plate-shaped plate in front of each water sprinkling port of the roll crank headers 5, 5' and the rolling cooling headers 6, 6'. A shielding plate 7 is arranged, and each shielding plate 7 is located at the front and rear of the rolling roll 2.
Each shielding plate 7 is attached to the tip of an arm 13 that is moved up and down by a cylinder 12 about a shaft 11, as shown in FIG. It is operated so that the cooling water is shut off when passing the position, and immediately opened after the front and rear ends pass.

The opening/closing operation state of this shielding plate 7 is shown in FIGS. 2 to 5. First, when the rolled material 4 is transferred close to the rolling cooling header 6,
a is detected by the detector 9, and the cylinder 12 is actuated by this detection signal to move the front side 2 as shown in FIG.
The two shielding plates 7 are closed at the same time, and the cooling water in the rolling cooling header 6 and the roll crank header 5 is shut off. In this state, the tip end 4a of the rolled material 4 passes through the header position without being cooled by water and enters between the rolling rolls 2. Here, the rolling cooling header 6 and the shielding plate 7 of the roll crank header 5 are opened as shown in FIG. 3, and cooling water is applied to the rolled material 4 and the rolling roll 2, while at the same time ' and the shielding plate 7 of the roll crank header 5' are closed as shown in FIG. 3 to cut off the cooling water until the tip end 4a of the rolled material passes that position. Immediately after the tip of the rolled material passes, the shielding plate 7 on the rear side of the roll is also opened, resulting in a normal cooling state as shown in FIG. 4, and water cooling of the rolled material 4 and the rolling roll 2 is fully performed before and after the rolls. It becomes like this. The opening/closing operation of the shielding plate as described above related to the passage of the leading end portion 4a of the rolled material is performed over time according to commands from a controller, not shown, which is operated using a signal from the leading end detector 9 as an input signal.

As the rolling of the rolled material 4 progresses in the state shown in FIG. , the shielding plates 7 of the rolling cooling header 6 and the roll crank header 5 are closed as shown in FIG. 5 to cut off the cooling water from both headers. At this time, the shielding plates 7 of the roll rear headers 5', 6' are still open, and at the same time the shielding plates 7 of the roll front headers 5, 6 are opened by the passage of the rolling material rear end 4b, the roll The shielding plates 7 of the rear headers 5', 6' are closed in a state similar to that shown in FIG. 3, and are opened again immediately after the rear end portion 4b of the rolled material passes through the rear header position of the roll. This opening/closing operation of the shield plate is also performed over time according to commands from a controller (not shown) that is operated using the signal from the rear end detector 10 as an input signal.

In addition, in the above embodiment, a structure was described in which the shielding plate 7 as a cooling water control means was arranged in front of the water sprinkling ports of the roll cooling headers 5, 5' and the rolling cooling headers 6, 6', respectively. ，
It can also be implemented by providing only 6'.

The hot rolling mill cooling device of the present invention has the effect of reliably preventing the problem of overcooling at the leading and trailing ends of the rolled material by controlling the cooling water applied to the rolled material by opening and closing the shielding plate. There is.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a shielding plate structure showing one embodiment of the device of the present invention, and FIGS. 2 to 5 are operation explanatory diagrams sequentially showing the opening and closing operation of this shielding plate. DESCRIPTION OF SYMBOLS 1...Housing, 2...Roll roll, 3...Backup roll, 4...Rolled material, 5, 5'...Roll crank header, 7...Cooling water shielding plate, 9, 10...
Lead/Trail detector.

Claims (1)

[Scope of Claims] 1. A cooling device for a hot rolling mill equipped with a roll coolant header for cooling rolling rolls and a rolling cooling header for cooling a rolled material, wherein at least the rolling cooling header in each of the headers is disposed of. In front of the water inlet, a cooling water shield plate that can be opened and closed to control the cooling water applied to the rolled material is placed, and the leading and trailing ends of the rolled material are detected and the detection signals are used to control the leading and trailing ends of the rolled material. A cooling device for a hot rolling mill, comprising a leading and trailing end detector for opening and closing the shield plate to prevent excessive cooling. 2 A cooling water shielding plate is placed in front of both the water sprinkling ports of the roll coolant header and the rolling cooling header,
These shielding plates are kept closed until the leading end of the rolled material passes, and then opened immediately after passing, and closed again when the trailing end of the rolled material arrives.
2. The cooling device for a hot rolling mill according to claim 1, wherein the cooling device is interlocked with a signal from a rolling material leading and trailing end detector.