JPH0536123B2 - - Google Patents

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a rolling roll that can be used as a horizontal roll in a universal rolling mill used in the production of H-section steel, etc., and whose roll width can be suitably changed. It is something.

(Prior Art) For rolling H-section steel, it is common to use a universal rolling mill that incorporates a pair of upper and lower horizontal rolls and a pair of left and right vertical rolls in the same stand.

Conventionally, when manufacturing H-section steel using such a rolling mill, the flange width of the H-section steel can be freely changed as long as it is within the roll width of the vertical roll.
Since the height h of the web of the H-section steel is determined by h=W+ _2t1 , that is, the flange thickness _t1 and the roll width W of the horizontal roll, the following problem occurred.

(1) Since the inner surface of the flange is rolled down and rolled with the end face of the horizontal roll, there is severe wear on the end face of the roll, and even within the same rolling chance, as the amount of rolling increases, the web height becomes insufficient, making it difficult to stabilize the product to a certain size. In order to avoid this, frequent replacement of the rolls was required.

(2) While the flange width can be freely selected, the web height can only be selected for one roll and one size.

(3) H-beam steel h = W + 2t ₁ , so-called constant outer rectangle H-shape steel with a constant web height h has many different flange thicknesses t ₁ even with the same designation size, so the roll width W of the horizontal roll is It is necessary to change it appropriately depending on the required flange thickness _t1 , but in order to correspond to this, frequent replacement of the roll is required, which impedes productivity and increases the number of man-hours.

(4) In order to improve dimensional accuracy, frequent machining is performed to match the roll width W of the horizontal roll to the inner rectangular dimension W ₁ of the H-section steel, resulting in a high roll unit consumption (see Figure 4).

For example, Japanese Patent Laid-Open No. 61-262407 and Japanese Patent Application Laid-Open No. 61-169105 have attempted to solve the above problems, and there is a technique for inserting a spacer for adjusting the roll width between a pair of sleeve rolls to prevent wear of the rolls. (5th
JP-A No. 61-262407 discloses a technology in which the roll width is adjusted by moving the sleeve roll from side to side around the roll center by engaging a screw and a nut.
Publication No. 202101, Japanese Patent Publication No. 61-172605, Japanese Patent Publication No. 172605
No. 63-56302 discloses a technique for freely changing the web height of a section steel using oblique rolls.

(Problems to be Solved by the Invention) However, in the method of inserting a spacer between the sleeve rolls, the horizontal rolls must be removed from the stand off-line, which impedes production efficiency and increases the number of assembly and disassembly steps. There are problems such as difficulty in finely adjusting the roll width, and methods that move sleeve rolls require a complicated structure to drive them, and the lateral rigidity of the rolls is low. When a rolling load is applied, the horizontal rolls wobble in the axial direction, resulting in problems such as poor dimensional accuracy of the product. In addition, when using skew rolls, there is a disadvantage that the structure of the equipment is complicated and the cost involved is enormous.

It is possible to solve the above-mentioned conventional problems and provide a variable width rolling roll that is particularly suitable for use as a horizontal roll of a universal rolling mill when producing shaped steel of a fixed size or shaped steel of different sizes. This is the object of this invention.

(Means for Solving the Problems) The present invention includes a pair of sleeve rolls that fixedly hold an operation side roll and a drive side roll, respectively, and one of the sleeve rolls is rotatably supported in a cantilever manner via a bearing. , the other end is rotatably supported via a bearing, and the other end portion is fitted into a through hole of the one sleeve roll and is fixedly held on a roll shaft that is rotationally driven together with the one sleeve roll, The shaft end of the roll shaft that fits into the through hole of one of the sleeve rolls is provided with a moving means for sliding the roll shaft along the axial direction and a hydraulic chamber for preventing the roll shaft from wobbling in the axial direction. This is a variable width rolling roll.

Now, FIGS. 1 to 3 show examples in which the variable width rolling roll according to the present invention is incorporated as a horizontal roll of a universal rolling mill. In the figure, number 1 is the H-beam steel to be rolled, and 2a and 2b are the H-beam steel 1.
a vertical roll for rolling down the outer surface of the flange part, 3a;
Reference numeral 3b represents a chock for pivotally supporting the vertical rolls 2a and 2b, and reference numerals 4a and 4b represent a pair of upper and lower horizontal rolls provided with a roll width variable mechanism. Below this horizontal roll 4
The details of a and 4b will be explained by taking the horizontal roll 4a as an example. Note that the left side in the drawing is the drive side connected to the drive device, and the right side is the operation side.

Of the sleeve rolls, which have a two-part structure including a driving side roll L _R and an operating side roll R _R , which control the rolling of the web part and the inner surface of the flange of the H-shaped steel, the sleeve roll 5a fixedly holds the driving side roll L _R. is shrink-fitted to the roll shaft 6 in its through hole H, and one end of the roll shaft 6 is supported via a bearing 7 by a chock 9 fitted into a housing 8.

The roll shaft 6 is connected to a drive device (not shown), and the torque necessary for rolling is transmitted by this drive device.

At the shaft end (operation side) on the operation side of the roll shaft 6,
As a moving means for sliding the roll shaft 6 along its axial direction, a screw rod 10 connected and fixed to the end of the shaft and a nut 11 that engages with the screw rod are provided.

The nut 11 is rotatably held in a nut storage box 12 and connected to a hydraulic motor 15 via a connecting shaft 13 and a speed reducer 14, and is rotated by the drive of the hydraulic motor 15.

On the other hand, the sleeve roll 5b that fixedly holds the operation side roll R _R is connected to the housing 8 through a bearing 16.
The roll shaft 6 is supported in a cantilever manner by a chock 17 fitted into the chock 17, and the roll shaft 6 is fitted into a through hole H' formed in the axial direction. As shown in FIG. 2, for example, a spline groove 18 is provided on the inner surface of the through hole H' of the sleeve roll 5b, and spline teeth 19 are provided on the outer circumferential surface of the roll shaft 6 corresponding to the spline groove. 6 rotates the operating sleeve roll 5b together with the roll shaft 6. The nut 11, the nut storage box 12 to the hydraulic motor 15 main body rotate together with the sleeve rolls 5a, 5b and the roll shaft 6 during rolling, and there is no relative rotational speed difference between them.

Further, reference numeral 20 denotes a hydraulic chamber constituted by the sleeve roll 5b and the roll shaft 6 as a means for preventing rattling and occurrence of elastic strain in the axial direction of the roll shaft 6. This hydraulic chamber 20 has a pressure oil supply and discharge circuit. Connected. Also, 21 is a tie bar connecting the chock 9 on the driving side and the chock 17 on the operating side, 22 is a scale cover, and 23 in Fig. 3 is a stopper 23a, a lever 23b, and an adjusting screw 23c, which adjust the roll center of the horizontal roll. This is a position adjustment device.

(Function) The adjustment operation of the roll width of the horizontal roll configured as described above will be explained below.

Among the horizontal rolls shown in FIG. 1 above, the upper horizontal roll 4a has a reduced roll width, and the lower horizontal roll 4b has a wider roll width.
Now, for example, the upper horizontal roll 4a is changed to the lower horizontal roll 4b.
In order to increase the roll width, first, the hydraulic motor 15 is operated, and the nut 11 is rotated through the reduction gear 14 and the connecting shaft 13. This nut 11
As a result of the operation, the roll shaft 6 connected to the screw rod 10 moves along the axial direction while sliding through the through hole H' of the sleeve roll 5b and the bearing 7, and therefore the sleeve roll 5a and the sleeve roll 5b Drive side roll held fixed on
The roll width of L _R and the operation side roll R _R is changed in the direction of expansion like the lower horizontal roll 4b.

At this time, the pressure oil supply and discharge circuit in the hydraulic chamber 20 is set to an open state so that no hydraulic pressure is applied to prevent the roll shaft 6 from shaking in the axial direction when the roll width setting is completed. Supply oil and set to the specified pressure.

When oil is supplied to bring the hydraulic chamber 20 to a predetermined pressure, an elastic strain corresponding to the load acting on the hydraulic chamber 20 is generated, and the roll width is reduced by the corresponding amount. Therefore, when setting the roll width, it is necessary to set the roll width larger by that amount. Specifically, the above elastic strain ε _x is: ε _x = W ₀ /K _x W ₀ : Load acting on the hydraulic chamber (ton) K _x : Lateral rigidity of horizontal roll (ton/mm) ε _x : Elastic strain (mm ), and the load W ₀ acting on the hydraulic chamber 20 is set to a value slightly larger than the axial load generated during rolling.

In this example, the hydraulic motor 15 is used as a drive source for adjusting the roll width of the horizontal roll, but this may be an electric motor or the like. Furthermore, when changing the roll width, if a detector that can measure the amount of movement is installed, the width can be changed with higher accuracy.

(Effect of the invention) According to this invention, the roll width of the rolling roll can be freely changed online without any problem, so when applied to the horizontal roll of a universal rolling mill used for manufacturing H-beams, etc. Not only can products of a constant size be stably obtained even if the rolls are worn, but also products of different sizes can be easily produced without requiring roll replacement.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of the configuration of a variable width rolling roll according to the present invention, Fig. 2 is a view from A-A in Fig. 1, Fig. 3 is a view from B-B in Fig. 1, and Fig. 4 is a universal view. FIG. 5, which is an explanatory diagram of the procedure for rolling H-beam steel using a rolling mill, is a diagram showing a conventional rolling roll. 1...H-shaped steel, 2a, 2b...vertical roll, 3a,
3b...Chick, 4a, 4b...Horizontal roll, 5
a, 5b...Sleeve roll, 6...Roll shaft, 7...
Bearing, 8...Housing, 9...Chock, 10...Screw rod, 11...Nut, 12...Nut storage box, 13...Connection shaft, 14...Reducer, 15...Hydraulic motor, 16...Bearing, 17...Chock, 18 ... Spline groove, 19 ... Spline tooth, 20 ... Hydraulic chamber, 21 ... Position adjustment device, L _R ... Drive side roll,
R _R …Operation side roll.

Claims (1)

[Claims] 1 Equipped with a pair of sleeve rolls that fixedly hold an operation side roll and a drive side roll, one of the sleeve rolls is rotatably cantilevered through a bearing, and the other end is rotatably supported through a bearing. The sleeve roll is freely supported, and the other end region is fitted into the through hole of the one sleeve roll, and is fixedly held on a roll shaft that rotates together with the one sleeve roll, and is fitted into the through hole of the one sleeve roll. A variable width rolling roll, characterized in that the shaft end of the roll shaft is provided with a moving means for sliding the roll shaft along the axial direction and a hydraulic chamber for preventing wobbling of the roll shaft in the axial direction. .