JPH0724926B2 - Pinch roll device for both slab and billet - Google Patents

Description

TECHNICAL FIELD The present invention relates to a slab / billet / pinch roll device in a continuous casting facility.

[Prior Art] The pinch roll disposed in the subsequent stage of the continuous casting machine rotates the roll while sandwiching the slab and the like with a pair of rolls sandwiching the pass line, and the dummy bar to the mold before the start of casting. Prevents falling of the dummy bar at the time of reverse feed and start of casting, extraction of unsolidified slab and control of extraction speed,
In a continuous casting machine for slabs, a pair of roll segments having a plurality of rolls are arranged vertically with a pass line in between, and a large number are arranged in the slab withdrawing direction, for example, a lower roll segment as a base. It is fixed to the frame and the upper roll segment can be moved forwards and backwards with respect to the lower roll segment by a hydraulic cylinder etc., the upper roll is pressed down, the lower roll is driven to rotate and the slab is pulled out, and the curved continuous casting machine is used. If there is, the slab is straightened and rolled at the same time.

[Problems to be solved by the present invention] When such a continuous casting machine for slabs is also used for billets or for billets, if the existing slabs are operated as they are, the output of the hydraulic cylinder for reduction, the roll diameter And the like, and because the billet has a smaller cross section than the slab, the reduction by the pinch roll is a heavy reduction, and there is a problem that the roundness of the billet shape, especially the round billet, deteriorates. In other words, when pulling out a slab with a pinch roll, a large cross-section requires a large pulling force to prevent bulging, so it is necessary to push with a pressing force commensurate with that, and a large pinch roll capacity (cylinder size And roll diameter) are required. However, with such a large pinch roll capacity, light reduction is not possible, so the present invention was accomplished.

This invention has been made to solve the above-mentioned problems, and its purpose is to enable light reduction with an existing slab continuous casting machine, and to easily use an existing slab continuous casting machine for billets. An object of the present invention is to provide a slab / billet dual-purpose pinch roll device that can be used for dual use or billet use.

[Means for Solving the Problems]

The present invention, as shown in FIG. 1, has a pair of upper and lower roll segments 1 and 2, and one roll segment 1 is capable of advancing and retracting with respect to the other roll segment 2 by a main cylinder 3. In the above, the movable side roll segment 1 is provided so as to be swingable in the slab withdrawing direction around the fulcrum 4, and an auxiliary cylinder 5 for tilting the movable side roll segment 1 in the swing direction is provided on the movable side roll segment 1. Is connected.

The auxiliary cylinder 5 is provided in a part or all of the movable roll segment 1 and the pressure can be controlled.

[Action]

Movable roll segment 1 by operating auxiliary cylinder 5
When the roller is tilted around the fulcrum 4, one roll at the end of the segment contacts the billet, and the pressure of the auxiliary cylinder 5 is adjusted, so that a light reduction is possible.

When the size of the billet is changed, the main cylinder 3 moves the movable roll segment 1 to respond.
Then, the main cylinder is positioned by the distance piece, and the position of the fulcrum is changed by using the main cylinder and the distance piece according to the size of the billet.

When straightening the slab, holding the drawn bar, and holding the dummy bar, the upper cylinder 1 is fixed horizontally by the holding cylinder 5 with respect to the lower roller segment 2, and the auxiliary cylinder is not used. The roll segment 1 is moved, and rolling is performed on all rolls.

〔Example〕

Hereinafter, the present invention will be described based on an illustrated embodiment. This is an example in which an existing slab continuous casting machine was utilized to modify the billet in order to reduce the billet construction cost, and as shown in FIG. 3, a curved continuous casting machine was used. This is an example applied to a primary pinch roll band 6 that simultaneously corrects a cast slab and holds it in a rolled state.

In the pinch roll device, roll segments 1 and 2 each having three rolls 7 are vertically paired with a pass line interposed therebetween, a lower roll segment 2 is fixed to a base frame, and an upper roll segment 1 is guided by a guide post (not shown). As a result, the upper roll segment 1 can be moved back and forth with respect to the lower roll segment 2 and the upper roll segment 1 can be moved by the main cylinder 3 attached to the base frame side.

Since such a pinch roll device is originally for a slab, a hydraulic cylinder with a large output and a long stroke (for example, φ340 mm × stroke 200 mm) is used for the main cylinder 3, and when it is cast into a round billet,
It is impossible to hold the dummy bar for the slab in the initial stage of casting, and to correct and hold it by applying a light reduction to a wide range of φ187 to 335 mm during casting.

Therefore, in the present invention, the upper roll segment 1 can be swung in the slab withdrawing direction around the fulcrum 4, and the auxiliary cylinder 5 presses the end roll 7 of the three rolls against the slab in a balance manner. And it should be possible to adjust the rolling force. This auxiliary cylinder 5 is a hydraulic cylinder having a smaller output and a shorter stroke (for example, φ125 mm x stroke 45 mm) than the main cylinder 3, and a back pressure circuit having a pressure control valve is provided in the hydraulic circuit to adjust the pressure according to the billet diameter, timing, etc. Make it adjustable. For example, the main cylinder 3
Presses the dummy bar at 83 [Ton / seg] so that when billet is straightened and held, it can be straightened and held at 0.3 to 24 [Ton / seg]. This correction and pressure reduction can be performed by pressure control, and the back pressure circuit applies pressure to both the rod side and the head side of the cylinder to generate a pressing force of the area difference, but it is not a special circuit.

As shown in FIG. 2, the piston shaft tip of the main cylinder 3 is pivotally attached to the fulcrum pin 4, and the auxiliary cylinder 5 is pinned to the frame of the upper roll segment 1 to fix the cylinder base. Pin on the side member.

The auxiliary cylinder 5 is provided on the upper roll segment 1 other than No. 3, and the No. 3 upper roll segment 1 is retracted. This is not a reason to evacuate the No. 3 upper roll segment 1 in particular, and it is a structural problem of the continuous casting machine, and some auxiliary cylinders 5 may be removed due to structural restrictions.

Further, the partially black-painted roll in the figure is a roll that is rotationally driven, and the roll corresponding to this rotary drive roll is lowered by the auxiliary cylinder 5 and comes into contact with the billet.
When the dummy bar is pulled out, the upper roll segment 1 is fixed in parallel with the lower roll segment 2 by the auxiliary cylinder 5.

With the above structure, the billet is pulled out as follows.

[Advantages of the Invention] As described above, the pinch roll device according to the present invention enables the movable roll segment that moves forward and backward by the main cylinder to swing about the fulcrum pin and tilts by the auxiliary cylinder. With the slab continuous casting machine, light reduction is possible, and billets can be manufactured without newly constructing a billet continuous casting machine and without deteriorating the roundness of a round billet.

[Brief description of drawings]

FIG. 1 is a schematic side view showing a pinch roll device according to the present invention, FIG. 2 is a schematic view showing a driving device thereof, and FIG. 3 is a schematic side view showing an embodiment. 1 ... Upper roll segment 2 ... Lower roll segment 3 ... Main cylinder, 4 ... Support point 5 ... Auxiliary cylinder 6 ... Primary pinch roll band, 7 ... Roll 8 ... Delivery pinch roll 9 ... Delivery pinch Roll cylinder

Claims (1)

[Claims] 1. A pinch roll device having a pair of upper and lower roll segments, one roll segment being capable of advancing and retracting with respect to the other roll segment by a main cylinder, wherein the movable roll segment is cast around a fulcrum. A slab / billet dual pinch roll device, which is swingably provided in the one-sided pulling direction, and an auxiliary cylinder for tilting the movable roll segment in the swing direction is connected to the movable roll segment.