JPS6016285B2 - universal rolling mill - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the structure of a universal rolling mill consisting of a pair of horizontal rolls and a pair of vertical rolls used for rolling a long steel section.

Conventionally, for example, in rolling sections, a double roll groove rolling mill consisting of a pair of horizontal rolls has been mainly used. The groove rolling method has the following drawbacks due to its characteristics. 1 Poor shape and dimensional accuracy, making it impossible to obtain a particularly large flange width.

2. It is necessary to hold a large number of rolls for each size item, and there is a lot of lost time when changing the rolls, resulting in low productivity.

3. Since it is indirect rolling, the forging effect is small and large elongation cannot be achieved.

4. Severe roll wear and low roll consumption.

Therefore, in order to eliminate these drawbacks, a universal rolling mill was developed that consists of a pair of horizontal rolls and a pair of vertical rolls and is capable of directly rolling down the weave and flange. It is provided. However, when rolling a section, for example, in such a universal rolling mill, the material is usually reciprocated a plurality of times in the same rolling mill.

At this time, each roll is individually displaced so that the gap between the rolls corresponding to the cross-sectional shape of the rolled material formed by the rolls decreases with each pass, but due to the nature of using the same roll, the shape does not change at all. Never. Therefore, if it is possible to change not only the cross-sectional area of the material shaped by the rolls but also its shape with each pass in the universal rolling mill, efficient rolling of the shaped material becomes possible.

This is based on the following reasons. In other words, the purposes of shape steel rolling, in terms of Yanagisuku, are one to transform the material into a desired shape, and the other to elongate the material.

Since the universal rolling mill has a large stretching function as described above, it can be said that it is mainly used for stretching materials into long lengths. Therefore, if this universal rolling mill is given a stretching function as well as a forming function that differs for each pass, it will have the same functionality as several rolling mills, reducing the limited number of stands and hole shapes. It becomes possible to use the material effectively, and it becomes possible to carry out efficient rolling that changes the shape to medium or large.

As shown in FIG. 1, the secondary universal rolling mill includes a pair of driven horizontal rolls 3 built into a housing body 1, and an inner housing 4 for vertical rolls built into the housing body 1. It consists of a total of four rolls, a pair of non-driven vertical rolls 6 built into the
The roll gap is changed by displacing the rolls 3, 6 by means of reduction screws 7, 8, respectively.

As shown in FIG. 2, only one vertical roll 6 is built into the vertical roll chock 5.
is displaced by the Shoshita screw 8 in the vertical roll inner housing 4.

Therefore, the cross-sectional area of the material in a plane perpendicular to the path direction, including the center circle of each roll, which is formed by a total of four rolls, a pair of horizontal rolls and a pair of vertical rolls, changes by displacing each roll. However, the structure is such that it is not possible to change the shape for each pass because a vertical roll of the same shape is used for multiple passes.

The present invention solves the above-mentioned conventional defects in such a universal rolling mill, and simultaneously changes the cross-sectional area and shape of the material in a plane perpendicular to the pass direction including the axis of each roll. This was done with the aim of obtaining a universal rolling mill with a structure that can be changed for each pass.

The feature is that the structure of the horizontal roll is no different from the conventional one, but multiple vertical rolls with different shapes are built into the vertical roll chock, and a vertical roll with a different shape is used for each pass. The aim is to change not only the cross-sectional area but also the shape of the material. Fig. 3 shows a top view of the structure of the vertical roll according to the present invention, for example, when three vertical rolls are built in, and Fig. 4 shows a side view as well. explain.

Vertical rolls 6, 6', 6'' of different shapes are each supported by bearings 9, 9', 9'' in the same plane, and each vertical roll maintains a certain position with respect to each other while being close to each other or For example, a worm wheel is attached.

The worm wheel is built into the vertical roll chock 5 and supported by the rotating shaft 11. A worm gear 12 is engaged with the rotating shaft of the worm wheel, and a drive source 13 for rotating the worm gear is connected to the worm gear.
is connected. The vertical roll chock is built into the vertical roll inner housing 4, and the vertical roll inner housing is structured to be built into the housing body of the rolling mill. Next, the operating principle of this vertical roll will be described.

The vertical rolls 6, 6', 6r are rotatable with bearings 9, 9'.
, 91, one worm wheel is fixed,
During rolling, it rotates freely as the material passes through it. Rotating shaft 11
The worm wheel fixed to the vertical roll chock 5 is freely rotated by the worm gear 12 meshed with the rotating shaft. Now, when changing the vertical roll 6 to a vertical roll 6' in order to change the shape of the vertical roll, the worm gear 12 is rotated by activating the drive source 13 connected to the worm gear, and then the worm gear 12 is meshed with the worm gear. As the rotating shaft 11 rotates, the worm wheel 10 rotates. This allows the vertical rolls 6 of any desired shape to participate in shaping the cross-sectional shape of the material performed by each roll. When changing the roll gap in order to reduce the cross-section of the material, the vertical roll chock 5 is lowered by the lowering screw 8 to displace the vertical roll. By using a universal rolling mill with the structure described above for rolling shaped materials, vertical rolls of any shape can be used for each of the multiple reciprocating passes in the universal rolling mill, resulting in large stretching functions and effective This makes it possible to obtain excellent molding functions.

Below, the universal rolling mill according to the present invention will be explained in detail based on examples. FIG. 5 shows the roll shape and material type when rolling a square steel piece into a rough-shaped steel piece for day-shaped steel using a secondary universal rolling mill.

This is an example of rolling with a single universal rolling mill, but with conventional universal rolling mills, the shape of the vertical rolls cannot be changed during rolling, so the material is simply rolled by the vertical rolls 6. Although the flange height is formed only by the broadside of 14, it was difficult to obtain a sufficient flange height.

FIG. 6 shows an example in which similar rolling is performed using a universal rolling mill according to the present invention using, for example, three vertical rolls 6, 6', and 6^ of different shapes. be.

In the first pass, a vertical roll 6 having a convex hole shape is used to make an incision in the side of the material 14, and in the second pass, by rotating the worm wheel, a second vertical roll with a different shape is made. The roll 6' is made to participate in rolling,
Furthermore, the flange height can be further increased by cutting the sides deeply and opening the sides of the material using a third vertical roll 6^ of a different shape in the same way in the third pass. Become.

In this case, since three vertical rolls are used, it is generally necessary to make the roll diameter smaller than when using one vertical roll due to its structure, but if there is a problem with roll strength, each vertical roll It is sufficient to provide a parallel portion to the rolls that are not involved in rolling to have a function as a backup roll. If there is no problem in terms of strength, it is not necessary to provide a backup roll function, and each may be used independently. Also, like this, the diameter of the vertical roll is 4.
This means that the horizontal rolls 3 start contacting the material 14 earlier than the vertical rolls, and the secondary effect of easily improving the biting and rolling properties of the material can be exhibited. Fully expected.

Furthermore, the shape, number, combination, and number of baths of the three vertical rolls 6, 6', and 6'' shown in FIG. 6 are not limited, and can be freely changed depending on the purpose. ,
It goes without saying that the present invention includes any of these modified patterns.

FIG. 7 is an example showing rolling in an initial shaping pass when rolling a scalene angle iron with uneven thickness using the universal rolling mill according to the present invention.

For example, when using three types of vertical rolls with different shapes, effective forming is possible by having the vertical rolls participate in rolling in the order of 6, 6', and 6r for each bath, and the subsequent hole shapes This means that it can be rolled into the most suitable shape.

FIG. 8 is an example showing rolling in an intermediate finishing pass when steel sheet piles are rolled by the universal rolling mill according to the present invention.

In this case, for example, there are three types of vertical rolls 6, 6 with different shapes.
′, 6″ is used, the material 14, which has been previously formed into a hole shape and sent, is directly rolled down sequentially by a pair of horizontal rolls 3 and a pair of vertical rolls 6, 6′, 6r for each pass. , it is possible to obtain a large elongation and to perform bending forming of the flange, which allows for a margin in the number of subsequent finishing holes, making forming in the finishing pass much easier. One effect can be expected.

FIG. 9 shows an example of rolling a square bar from a square steel well using the universal rolling mill of the present invention. In a conventional universal rolling mill, only one vertical roll is built into one chock, so the length of the vertical roll remains constant, and therefore the number of passes that can be rolled in one stand is limited to only one pass. was.

However, in the universal rolling mill according to the present invention,
For example, since three types of vertical rolls 6, 6', and 6^ with different body lengths are built into the chock, vertical rolls 6, 6', and 6^ with different body lengths are
6', 6'' can be used sequentially. That is, by rotating the material 45 degrees at the entrance of the mill for each pass, material 14 to 14' and material 14 can be used in one rolling mill. It is possible to sequentially roll 3 passes from ' to 14'' and from material 14'' to 14''', resulting in great effects such as a reduction in the number of stands and a dramatic improvement in rolling efficiency.
Although four specific examples have been explained in detail,
It goes without saying that the examples are not limited to these, and include all deformation patterns as far as rolling using the universal rolling mill of the present invention is concerned.
The universal rolling mill of the present invention can be applied to any stage of rolling, such as rough rolling, intermediate finishing rolling, and finishing rolling, and one rolling mill is suitable for several conventional rolling mills. It is clear that this is an extremely effective rolling mill with many functions.

Furthermore, if the universal rolling mill of the present invention is used, it is fully expected that conventional rolling methods and rolling efficiency will be dramatically improved.

[Brief explanation of drawings]

Fig. 1 is a front view schematically showing a conventionally known universal rolling mill, Fig. 2 is a top view schematically showing the vertical roll section of the conventional universal rolling mill, and Fig. 3 is a schematic diagram showing the present invention. FIG. 4 is a diagram showing an example of a top view schematically showing the vertical roll part of a universal rolling mill, and FIG.
Figure 5 is a cross-sectional view taken from the side when cut at A, and Figure 5 is an example of rolling by a conventional universal rolling mill. FIG. 7 is a diagram illustrating an embodiment of the rolling process of a rough shaped steel piece for H-beam steel by the universal rolling mill according to the invention, and FIG. FIG. 8 is a diagram showing an embodiment of the rolling process in the rough pass when rolling a steel sheet pile using the universal rolling mill of the present invention. Embodiment FIG. 9 is a diagram illustrating an embodiment of the rolling process in which a square material is rolled from a square steel piece using the universal rolling mill of the present invention. 1...Housing body, 2...Bearing, 3...
・Horizontal roll, 4...Inner housing for vertical roll, 5
... Vertical roll chock, 6... Vertical roll, 7...
Horizontal roll chock reduction screw, 8... Vertical roll chock reduction screw, 9... Vertical roll rotation axis, 1
0... Worm wheel, 11... Worm wheel rotating rattan, 12... Worm gear, 13... Worm gear drive source, 14... Material. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9

Claims (1)

[Scope of Claims] 1. A plurality of vertical rolls are built into a vertical roll chock, and the plurality of vertical rolls are displaced along an arcuate trajectory in a plane perpendicular to its axis. A universal rolling mill equipped with a vertical roll displacement mechanism. 2. In the universal rolling mill described in claim 1, when each of the plurality of vertical rolls built into the chock has a surface that contacts each other, and one of the vertical rolls is involved in rolling. A universal rolling mill is constructed in which the remaining vertical rolls are configured to back up against the remaining vertical rolls.