JP2996013B2 - Rolling mill - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling mill.

[0002]

2. Description of the Related Art Generally, in metal rolling, as shown in FIG. 4, before rolling, an outer peripheral surface of a rolling roll 1 with respect to a rolled material 2 is flat in a longitudinal direction thereof. As shown in FIG. 5, a thermal crown is formed in the sheet width region of the rolled material 2 of the rolling roll 1 by the rolling process heat, and the shoulder a of the thermal crown is
As shown in FIG. 6, the rolled material is formed at a position about 50-100 mm inward from both ends in the longitudinal direction, and the bending of the rolling roll 1 due to the rolling force is combined. In addition, shape defects such as local elongation 3 (called quarter buckle or 1/8 wave) in the traveling direction of the rolled material 2 occur. In the figure, reference numeral 4 denotes a backup roll.

For this reason, conventionally, the rolled material 2
(See Japanese Patent Application Laid-Open No. 1-224105, etc.) by spraying a coolant as a coolant from a roll cooling device disposed on the inlet side of the roll to suppress the thermal crown by spraying the outer circumferential surface of the rolling roll 1. .

[0004]

However, even if an attempt is made to suppress the thermal crown by the roll cooling device using the above-mentioned coolant, as shown in FIG.
The rolled material 2 still has a shape defect because the steel remains in the plate width region.

There is also an example in which a heating device using a hot coolant is combined in addition to a roll cooling device using a coolant (JP-A-63-295003).
In this case, in order to prevent the coolant and hot coolant from being applied to the product after rolling, it is necessary to arrange both the roll cooling device and the heating device on the rolled material entering side of the rolling roll 1, which is performed due to restrictions on installation space. Is extremely difficult. In addition, the temperature of the hot coolant needs to be higher than the temperature of the rolling roll 1. In the case of aluminum rolling or the like, the temperature of the hot coolant must be raised to near its flash point. The combination of the cooling device and the heating device using the hot coolant has very large restrictions in practice.

In view of the above circumstances, the present invention has been devised to provide a rolling mill capable of appropriately suppressing a thermal crown without using a hot coolant and preventing a shape defect of a rolled material.

[0007] JP-A-58-65507 discloses that
A configuration in which the thickness of a rolled material is controlled by using an induction heater is shown. It is expected that the use of this induction heater can eliminate the limitations of the conventional heating device (burner). It is simply considered that a large number of induction heaters are arranged, and it is considered that the above problem cannot be solved.

[0008]

SUMMARY OF THE INVENTION The present invention provides a roll cooling device for supplying a cooling medium to a roll and cooling the roll, and the roll roll is provided at both ends of the roll on the rolled material exit side so as to be movable in the longitudinal direction. And an induction heating device.

It is preferable that the induction heating device has a structure having a temperature detecting means for detecting the temperature of the rolling roll in order to control the heating temperature.

[0010] The roll cooling device has a configuration in which a plurality of refrigerant injection nozzles are provided at predetermined intervals in the longitudinal direction of the rolling roll and are capable of injecting a refrigerant to the outer periphery of the rolling roll on the rolled material entering side. May be.

[0011] The roll cooling device may have a refrigerant supply / discharge means for passing a refrigerant through the inside of the rolling roll.

[0012]

With the above arrangement, the roll cooling device having the refrigerant injection nozzle or the refrigerant supply / discharge means suppresses the thermal crown by supplying the refrigerant to the rolling rolls. The induction heating means heats both ends of the rolled material of the rolling roll to partially form a thermal crown, and moves the shoulder of the thermal crown by the rolled material substantially outside the width region of the rolled material. .

[0013] Further, with the configuration in which the induction heating device has the temperature detecting means, feedback control can be performed so that the rolling roll has a desired temperature.

[0014]

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

FIG. 1 shows a first embodiment of a rolling mill according to the present invention, in which a coolant 5 as a refrigerant can be injected onto the outer periphery of a rolling material 1 of a rolling roll 1 on the entry side. A plurality of refrigerant injection nozzles 6 are arranged at required intervals in the longitudinal direction of the rolling roll 1 to constitute a roll cooling device 7, and induction heating is performed on both ends of the width side of the rolled material 2 of the rolling roll 1. The device 8 is disposed so as to be movable in the longitudinal direction of the rolling roll 1.

The induction heating device 8 has a built-in induction heating coil 11 connected to an induction heating power supply 10 in a casing 9 arranged side by side so as to face the outer peripheral surfaces of both width ends of the rolled material 2 on the rolling roll 1. And a coolant supply / discharge pipe 12 for preventing melting and the like due to heating of the induction heating coil 11. The nuts 13 are integrally fixed to the casing 9 and are parallel to the axis of the rolling roll 1. A ball screw 14 extending in the opposite direction from the center in the longitudinal direction and having opposite screw directions is screwed together, and a motor 16 installed on a support 15 is connected to the ball screw 14.
Guide rod 17 extending in parallel with ball screw 14 from
Is penetrated into each casing 9, and further, a cylinder 18 capable of moving the support base 15 in the radial direction of the rolling roll 1 is connected to the support base 15. The casing 9 can be moved close to and away from each other in the longitudinal direction of the rolling rolls 1 by rotating the ball screw 14 by the motor 16 in accordance with the sheet width of the rolled material 2. The position can be adjusted.

In the drawing, reference numeral 19 denotes a shape sensor provided on the rolled material 2 exit side. Injection of the coolant 5 from each refrigerant injection nozzle 6 from the control device 21 to the roll cooling device 7 based on a detection signal 20 of the shape sensor 19. A command signal 22 for adjusting the amount is output, and a detection signal 2 of the shape sensor 19 is output.
Based on 0, the control device 21 outputs a command signal 23 for adjusting the current supplied to the induction heating coil 11 to the induction heating power supply 10 of each induction heating device 8.

Next, the operation of the above embodiment will be described.

At the time of rolling, the ball screw 14 is rotated by a motor 16 in accordance with the sheet width of the rolled material 2, and the casings 9 of the induction heating devices 8 move close to and away from each other in the longitudinal direction of the rolling roll 1. The position of the rolled material 2 is adjusted so as to face both width end portions, and the cylinder 18
The distance between the casing 9 and the outer peripheral surface of the rolling roll 1 is appropriately adjusted by the stretching operation.

Rolling is performed in this state, and when a shape defect such as local elongation occurs at both width ends of the rolled material 2 due to a combination of a thermal crown due to rolling processing heat and a bending of the rolling roll 1 due to rolling force, etc. The shape sensor 19 detects this, and a command signal 22 is output from the control device 21 to the roll cooling device 7 based on the detection signal 20 from the shape sensor 19, and the injection amount of the coolant 5 from each refrigerant injection nozzle 6 is adjusted. At the same time, a command signal 23 is output from the control device 21 to the induction heating power supply 10 of each induction heating device 8 based on the detection signal 20 of the shape sensor 19, and the induction heating coil 11
The current supplied to is adjusted.

As a result, the rolling roll 1 is uniformly cooled in the width direction by the roll cooling device 7 to suppress the thermal crown, and both ends of the rolled material 2 on the rolling roll 1 are heated by the induction heating device 8. The thermal crown partially grows, and the shoulder portion 24 of the thermal crown
Are formed outside both width ends of the rolled material 2. That is, the shoulder a generated by the rolling is substantially moved outward, and the thermal crown within the width of the rolling roll 1 is made uniform.

In this manner, it is possible to suppress the shape defect of the rolled material 2 and, since the induction heating device 8 can be installed on the rolled material 2 exit side of the rolling roll 1, there is no restriction on space, and moreover, Induction heating exhibits superior heating capability compared to heating using a hot coolant, and partial thermal crowns at both ends can be actively and efficiently grown.

Next, a second embodiment of the present invention will be described with reference to FIG.

In this embodiment, as a roll cooling device, a refrigerant supply / discharge means 31 for passing the coolant 5 into the inside of the rolling roll 1 is configured, and the induction heating device 8 controls the temperature of the rolling roll 1. A temperature sensor 32 as temperature detecting means for detecting is provided.

The refrigerant supply / discharge means 31 includes a pump 33 for circulating or forcing the coolant 5 in one direction and a hose 3 connected to a shaft end 34 of the rolling roll 1 via a joint 35.
And a hose 3 at the axial center of the rolling roll 1.
6 is formed with a shaft hole 37 through which the coolant 5 passes. That is, the rolling roll 1 is cooled from the inside by the coolant sent from the pump 33. The pump 33 is connected to a controller 38 so that the discharge flow rate is adjusted based on the detection signal 20 from the shape sensor 19. In this configuration, the coolant 5 is not applied to the roll surface.
This is particularly effective in the case of dry rolling or the like in which a cooling fluid is not apt to be applied.

The temperature sensor 32 is attached to the casing 9 and held so that its terminals face the surface of the rolling roll 1. The detected value is stored in the controller 38.
, The supply current of the induction heating device 8 is adjusted to control the heating temperature. By directly detecting the surface temperature of the rolling roll 1 as described above, it is possible to perform quick and detailed appropriate feedback control as compared with the temperature control based on only the output signal of the shape sensor 19.

The other constructions and functions and effects are the same as those of the first embodiment, and therefore, the same reference numerals are given in the figures and the description is omitted.

The roll cooling device or the induction heating device of the present invention is not limited to the above-described embodiment, but may be variously modified without departing from the gist of the present invention. is there.

[0029]

In summary, according to the present invention, the following excellent effects are exhibited.

(1) According to the configuration of the first aspect, the thermal crown within the plate width of the rolling roll can be suppressed to a uniform shape, and the defective shape of the rolled material can be prevented.

(2) According to the configuration of the second aspect, further, appropriate feedback control of heating by the induction heating device can be performed.

(3) According to the configuration of the third aspect, the rolling crown can be uniformly cooled in the width direction to appropriately suppress the thermal crown.

(4) According to the configuration of the fourth aspect, the cooling medium does not splash on the roll surface, and does not hinder dry rolling or the like.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a first embodiment of a rolling mill according to the present invention.

FIG. 2 is a partial front view showing the shape of the rolling roll of FIG. 1 during rolling.

FIG. 3 is a perspective view showing a second embodiment of the present invention.

FIG. 4 is a partial front view showing a shape of a rolling roll before rolling.

FIG. 5 is a partial front view showing a shape of a rolling roll of a conventional rolling mill during rolling.

FIG. 6 is a perspective view for explaining a problem of a conventional rolling mill.

[Description of Signs] 1 Roll roll 2 Rolled material 5 Coolant (refrigerant) 6 Refrigerant injection nozzle 7 Roll cooling device 8 Induction heating device 31 Refrigerant supply / discharge means 32 Temperature sensor (temperature detection means)

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-59-199108 (JP, A) JP-A-59-212107 (JP, A) JP-A-54-23060 (JP, A) 50122 (JP, A) Japanese Utility Model 1-105004 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) B21B 27/10 B21B 45/00 B21B 45/02 320 H05B 6/10 381

Claims (4)

(57) [Claims] 1. A roll cooling device for supplying a cooling medium to a rolling roll for cooling, and an induction heating device movably provided in a longitudinal direction at both width ends of the rolling roll on a rolled material exit side. A rolling mill. 2. The rolling mill according to claim 1, wherein said induction heating device has a temperature detecting means for detecting a temperature of said rolling roll in order to control a heating temperature. 3. The roll cooling device has a plurality of refrigerant injection nozzles arranged at required intervals in the longitudinal direction of the rolling roll and capable of injecting a refrigerant to the outer periphery of the rolling roll on the rolled material entering side. The rolling mill according to claim 1 or 2, wherein: 4. The rolling mill according to claim 1, wherein the roll cooling device has a refrigerant supply / discharge unit for passing a refrigerant through the inside of the rolling roll.