JPS5924505A - Roughing mill for slab - Google Patents

Abstract

PURPOSE:To perform cross rolling under heavy draft without increasing rolling load and rolling torque by moving upper and lower sleeve rolls laterally and rolling a slab only in the longitudinal direction. CONSTITUTION:A screw shaft 13 is rotated to match a pair of upper and lower sleeve rolls 1, 2 on a left side with the center of a material S to be rolled so that the central part is rolled. The rolls 1, 2 are moved left and a pair of upper and lower sleeve rolls 3, 4 on a right side are moved right. The 1st stage of rolling over the entire transverse direction of the material S is completed by repeating the similar operations therefore. Upper and lower backup rolls 7, 8 are then moved upward or downward to change the set value of the roll gap between the rolls 1 and 2 and the set value of the roll gap between the rolls 3 and 4 and the 2nd stage of rolling is accomplished by repeating the operations similar to the operations in the 1st stage of rolling.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rough rolling mill that performs divisional rolling in the width direction of a strip to obtain a required width.

Conventionally, in order to roll a thick plate of a desired length and width from a slab manufactured by the continuous casting method, the material to be rolled ( The slab and the rolled plate during rolling were rotated every 90 degrees, causing problems such as scratches on the surface of the rolled thick plate and reduced productivity.

Furthermore, recently, there has been a demand for strong reduction rolling with the main purpose of improving the internal quality of thick plates, and for widthwise rolling of thick plates by only longitudinal rolling (unidirectional rolling).

In order to carry out heavy reduction rolling, rolling carts and rolling torque increase significantly, so a rolling mill equipped with a motor that is easy to handle, strong drive system members, housing, etc. is required, requiring a huge amount of capital investment. It takes.

Moreover, since there is a limit to the casting capacity of the rolling mill, the rolling mill cannot obtain sufficient cross-sectional strength to withstand the strong reduction blade, and is limited by the reduction blade, making it impossible to obtain necessary and sufficient rolling conditions.

In order to solve the above-mentioned problems, a rolling method has been proposed that can improve the quality of thick plate products by width-wise rolling of thick plates and improving the quality of thick plate products by only rolling the slab in the longitudinal direction. 141.14.9, JP-A-54-61058, JP-A-56-148402).

The present invention has developed a rough rolling mill for slabs for actually carrying out these rolling methods, and an example of its implementation will be described below with reference to the drawings.

1 to 4, 1 and 2 are a pair of upper and lower rolling sleeve rolls on the left; 3 and 4 are a pair of upper and lower rolling sleeve rolls on the right; is spline-fitted to a spline shaft 5 for transmitting rolling torque.

The left and right lower sleeve rolls 2 and 4 that have been twisted are spline-fitted to a spline shaft 6 for transmitting rolling torque.

#ill+ receiving boxes 1a, 2a, 3a, 4a are provided on the outer periphery of both ends of each of the sleeve rolls 1, 2, 3.4, respectively.

Each of the spline shirts l-5, 6 having a diameter of 1-5 is supported by a bearing box 5a, 5a, respectively, and each spline shaft 5, 6 has a spindle 5b at one end thereof,
It is rotated by a motor (not shown) via 6b.

Reference numeral 7 denotes an upper backup roll that receives rolling reaction forces from the left and right upper sleeve rolls 1 and 3, and this upper backup roll 7 is supported by a chock 7a.

Reference numeral 8 denotes a lower backup roll that receives the rolling reaction force from the left and right lower sleeve rolls 2 and 4, and this lower backup roll 8 is supported by a chock 8a.

These chocks 7a, 8a are provided in the /S housing 9 so as to be vertically slidable.

Chocks 7a at both ends of the upper backup roll 7
A holding beam 10 is provided at the front and rear between the lower surfaces of and, between the front and rear holding beams 10, the bearing boxes la and 3a of the left and right upper sleeve rolls 1 and 3 are installed in the left and right direction. The bearing box 5 of the upper spline shaft 5
a is held so as to be slightly slidable in the vertical direction.

A holding beam 1j is provided before and after the upper surface of the chock 8a at both ends of the lower backup roll 8, and between the holding beams 11 at the front and back, the left and right lower sleeve rolls 2, 4'l1lf + receiving box 2a,
4a is held so as to be slidable in the horizontal direction and slightly slidable in the vertical direction, and the bearing box 6a of the lower spline shaft 6 is held so as to be slightly movable in the vertical direction.

Bearing boxes la and 3 of the left and right upper sleeve rolls 1 and 3
a and the lower left and right sleeve rolls 2゜east of 4) 1 receiving box 2 a, 4. As shown in FIG. 3, in a, the piston rod head 1.2a abuts on each of the holding beams 1.0 and 1.1, and the upper left and right sleeve rolls 1.3
and lower left and right sleeve rolls 2 = 4'fc
, are provided with hydraulic cylinders 12 for pushing the upper backup roll 7 and the lower pull-up roll 8, respectively.

Each bearing box 5a of the upper and lower spline shafts 5 and 6
, 6a, a threaded screw shaft 13 passes through them from the outside in an inward direction, and each screw shaft 13 is connected to each bearing box 5a.

It is screwed into the oaks 5c and 6c fixed in the inside of the holder 6a.

One end of each of the screw shafts 13 is connected to each of the upper and lower ends.
“Bun” sleeve rolls 1, 2, 3. /l bearing box 1a,
A pair of upper and lower bearing boxes 1a, 2a and 19
11 each screw shaft 13 on the receiving box 3a, 4a side,
For example, the reversible motor, the worm wheel 11, and the worm wheel are rotated by an arbitrary Jtll interlocking 1, a worm wheel, and a worm wheel, respectively, to screw forward or backward from the nuts 5c and 6c, and move them along the spline shaft 5.6. Then, the pair of upper and lower bearing boxes 1a, 2a and the pair of bearing boxes 3a, 4a, especially the pair of upper and lower sleeve rolls 1.2 and sleeve rolls 3, 4, are moved to the right or left.

Now, a method for rolling a material to be rolled, such as a slab, using the slurry rough rolling mill constructed as described above will be explained.

First, the roll gap between the upper and lower pair of sleep rolls 1 and 2 on the left side and the roll gap between the upper and lower pair of sleeve rolls 3 and 4 on the right side are determined by the thickness ratio of the rolled material S, as shown in FIGS. 3 and 5A. To obtain the necessary value for rolling to thickness H5,
Upper and lower backup rollers, chock 7a of 8, ga
is moved up and down by a lowering and lifting device (not shown).

In this case, each roll is pressed by the hydraulic cylinder 12.
is operated to press the left and right upper sleeve rolls 1.3 and the left and right lower sleeve rolls 2, 4 against the upper backup roll 7 and the lower backup roll 8, respectively.

After setting the roll gap in this way, the pressure oil from the hydraulic cylinder 120 for pressing each roll is removed, and the upper left and right sleeve rolls 1 and 3, the lower left and right sleeve rolls 2 and 4, and the upper backup In addition to providing a gap between the roll 7 and the lower backup roll 8, each holding beam 10° and each roll pressing eliminate the frictional force between the piston rod head 12a of the hydraulic cylinder 12.

In addition, during normal work, the left and right lower sleeve rolls 2
, 4 bearing boxes 2a, 4aK for pushing the hydraulic cylinders 12 do not need to be used because the weight of the rolls acts on them.

Then, for example, the screw shaft 13 is rotated so that only the pair of upper and lower sleeve rolls 1.2 on the left side are in the center of the rolled material S, as shown in FIG. 5A, and the pair of upper and lower sleeve rolls on the left side are 1.2 is aligned with the central part of the material to be rolled S, and then the central part of the material to be rolled S is rolled by the pair of upper and lower sleeve rolls 1 and 2 on the left side.

At this time, the pair of upper and lower sleeve rolls 3 and 4 on the right side are positioned outside the width of the material to be rolled S and kept on standby.

When the rolling of the central part of the material S to be rolled is completed, at the same time, the upper and lower pair of sleeve rolls 3.4 on the right side are moved to the right (see FIG. 5B).

In this case, the upper and lower pair of sleeve rolls 1°2 on the left,
The shift 11 of the pair of upper and lower sleeve rolls 3, 4 on the right side, that is, the interval between the pair of upper and lower sleeve rolls 1, 2 on the left side and the pair of upper and lower sleeve rolls 3.4 on the right side is as shown in FIG. 5B. A value slightly smaller than the width W (W-α
).

This is because an unrolled part is not generated by adding a lap allowance α to the rolling width.

In this way, the material to be rolled S is rolled with the distance between the left and right rolls set to W-α.

Thereafter, by repeating the same process 'f', the first stage rolling ()IO-+Hl) over the entire width of the material S to be rolled is completed.

Once the first stage rolling is completed, as mentioned above, the upper and lower backup rolls 7.8? : Raise and lower, change the roll gap settings for the upper and lower pair of sleeve rolls 1 and 2 on the left side and the roll gap settings for the upper and lower pair of sleeve rolls 3 and 4 on the right side, and repeat the same operation as the first rolling. Perform second rolling.

As described above, according to the slab rough rolling mill of the present invention,
It is possible to perform tentering rolling of a material to be rolled, such as a slab, by strong rolling without increasing the rolling load, rolling torque, etc.

In addition, in order to roll the material to be rolled, such as a slab, to width by strong reduction without increasing the rolling load, rolling torque, etc., the sleeve roll diameter and rolling width should be reduced as shown in equations 1 and 2 below. It's better to do so.

p = Qp”Kf −wJ”mΣπ ・・・・・・
・・・・・・IT=PXId72
・・・・・・・・・・・・However, P: Rolling load, Qp: Rolling force function, Kf: Deformation resistance value, R: Sleeve roll radius, W: Sleeve roll width, Δh: Rolling fi
, T: Rolling torque, Nod: Contact arc length

[Brief explanation of the drawing]

FIG. 1 is a schematic front view of a rough rolling mill showing an example of the implementation of the present invention, FIG. 2 is a view taken along arrow A-A in FIG. 1, and FIG.
4 is a detailed enlarged view of the sleeve roll, and FIGS. 5A and 5B are explanatory views showing the rolling pattern.

Claims (1)

[Claims] Holding beams are provided at the front and back of the upper and lower opposed surfaces of each chock of the upper and lower backup rolls that are movable up and down through chocks in the housing, and the upper holding beams contact the upper backup rolls. The upper sleeve roll fixedly holds the bearing box of the upper spline shaft for transmitting rolling torque to which the upper sleeve roll is spline-fitted, and the bearing box of the upper sleeve roll having a built-in roll balance mechanism is held slidably in the left and right directions, and A bearing box for a lower spline shaft for transmitting rolling torque, in which a lower sleeve roll that contacts the lower backup roll is spline-fitted to the lower holding beam, is fixedly attached to the lower holding beam, and a bearing box with a built-in roll pushing mechanism for the lower sleeve roll is installed. 1. A rough rolling mill for slabs, characterized in that a driving means is provided for sliding bearing boxes of the upper and lower sleeve rolls in the left and right directions, the bearing boxes of the upper and lower sleeve rolls being held so as to be slidable in the left and right directions.