JPS6111133B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a side guide for rolling a strip.

BACKGROUND ART Conventionally, grooved rolls have been generally used for rolling strips, such as bars and wires of long steel and other non-ferrous metals (hereinafter simply referred to as "long steel").

However, not only is it difficult to process the caliber of a grooved roll, but there is also the risk of roll breakage, so the initial roll diameter must be made thicker, and the disadvantage is that there are many different types of rolls for each rolling size. However, in addition to changing the rolls for each size, centering adjustments between the caliber flanges of the roll pairs and the guides are disadvantageous due to downtime. It takes time to clean the grinder, and there are other drawbacks, such as the amount of reduction at the corners of the caliber being especially large, which means a large amount of cutoff tail is required, and the deformation resistance inside the caliber is high, which increases power costs. It is fraught with such problems.

Therefore, in place of the grooved rolls conventionally used for rolling long steel, it is possible to solve the above problems by using so-called flat rolls, or plain rolls, which have a roll body made of a simple cylindrical surface without a caliber. Alternating horizontal and vertical roll arrangements have been attempted and experiments are underway, but the current situation is that they have not yet been put into practical use.

The inventors discovered that when rolling a long steel using such flat rolls, the guides used on the entry side or on the entry and exit sides of the conventional hole-type roll rolling mentioned above are far more narrow in the gap between the rolls. At a position that cannot be reached, it only controls the guidance of the material to be rolled to the caliber of the grooved roll, and this caliber flange restrains the material to be rolled from folding (making the rolled cross section into a parallelogram) and twisting. However, it was revealed through rolling experiments on an actual operational scale that the flat rolls lack a means to hold the rolled material in the roll gap, and this has a significant impact on the success or failure of the rolling process. Based on the results, we developed the following configuration for a side guide for rolling long steel that can effectively hold the material to be rolled through the gap between the flat rolls.

This invention utilizes a pair of guide plates extending between the entrance and exit sides of a pair of horizontal rolling rolls having a roll body with a cylindrical surface through a roll gap, and rolling on each rest bar on the entrance and exit sides of a rolling mill housing at both ends of each guide plate. The thrust roller is mounted on the rest bar so as to be able to slide along the axis of the rolling roll, one guide plate is fixed to the rest bar at a selected position on the rest bar, and the other guide plate is fixedly attached to the rolling mill housing. This is a through-type side guide for rolling a strip material, which is connected to a device and thereby allows the inner gap between both guide plates to be variably set at any position parallel to the axis of the rolling roll.

Since the side guide according to the present invention penetrates the roll gap and secures the rolling section over a predetermined width,
It is an object of the present invention to advantageously realize the rolling of long steel with flat rolls without causing sagging or twisting of the material to be rolled, and thus to particularly effectively eliminate all of the above-mentioned problems associated with this type of rolling with grooved rolls. For the first time, it became possible.

Furthermore, since the side guide according to the present invention can be set to be freely movable in the thrust direction of the rolls, the entire surface of the pair of rolls can be used as the rolling operation surface, which not only extends the service life of the rolls, but also makes roll repair extremely easy. , and this set can be applied to rest bars used for installing guides in rolling mills that use conventional grooved rolls, so it can be easily adapted to the conventional arrangement of this type of rolling mill. can.

Now, Fig. 1 shows an embodiment of the side guide according to the present invention, using a roughly 250 mm width bloom as a rough material, square bars of 80 mm width, 115 mm width, and 145 mm width, and outer diameters of 75 to 85 mm, 90 to 100 mm, and The first stage mill for horizontal rolling of a long bar into a round bar of about 110 mm, in other words, the case where rough rolling is performed by alternately feeding the material in forward and reverse directions by reversing the rolls.

In the figure, 1 and 1' are a pair of horizontal rolling rolls having a roll body made of a cylindrical surface, 2 is a guide plate on the fixed side, 3 is a dowel pin for fixing the same, 4 is a guide plate on the movable side, and 5 is the thrust force for movement thereof. In the apparatus, 6 represents a rest bar provided in the rolling mill housing, 7 represents a rolling section formed between guide plates 2 and 4, and 8 represents a material to be rolled.

As shown in FIG. 3, the guide plates 2 and 4 are made by appropriately reinforcing the back surfaces of flat plates 11 and 12 having cutouts 9 and 10 corresponding to the roll gaps of the pair of rolling rolls 1 and 1'. It is arranged so that it passes through the roll gap so that it can slide along the rest bar 6.

The guide plate 2 is particularly provided with an extended leg portion 2' along the rest bar 6, and has a number of pin holes 13 in it.
are arranged in a row, and by selecting these pin holes 13 and fitting the knock pins 3 into the locking holes of the rest bar 6, the roll can be fixed at a selected position in the axial direction of the rolling roll.

On the other hand, the guide plate 4 is movable back and forth along the rest bar 6 by a thrust device 5 that is fixedly attached to the rolling mill housing, so that the guide plate 4 can be moved forward and backward along the rest bar 6 to maintain an appropriate width depending on the width of the material to be rolled 8. The rolling sections 7 can be set at selected positions in the axial direction of the roll cylinder, determined with respect to the guide plate 2, in particular with variable width. As the thrust device 5, an air cylinder, an oil jack, a feed screw, or the like can be used.

In this way, all the benefits expected from rolling using flat rolls having a roll body with a cylindrical surface can be advantageously achieved, contributing to improvements in the roll consumption rate and operation rate, and especially in the rolling section. Since the drawing width can be adjusted arbitrarily, using only one pair of guide plates, the width of the material to be rolled can be precisely adjusted in order to effectively prevent collapse and twisting, which is especially necessary when rolling long products with flat rolls. Of course, this can be easily done depending on the rolling width for each pass.

Here, the rolling width spread is approximately 30% of the reduction amount, and therefore, the guide plate interval may be set with a margin of approximately 20 mm, and automatic preset control may be added here.

[Brief explanation of the drawing]

1 and 2 are a front view and a plan view showing an embodiment of the side guide of the present invention, and FIG. 3 is a
FIG. 2 is a sectional view taken along the line XX in FIG. 1; 1, 1'... Roll for rolling, 2, 4... Guide plate, 6... Rest bar, 3... Knock pin, 5... Thrust device.

Claims (1)

[Scope of Claims] 1. A pair of guide plates extending between the entrance and exit sides of a pair of horizontal rolling rolls having a roll body with a cylindrical surface through the roll gap, are connected to each rest bar on the entrance and exit sides of the rolling mill housing at both ends of each guide plate. one guide plate is fixed to the rest bar at a selected position on the rest bar, and the other guide plate is
For rolling a strip material, characterized in that it is connected to a thrust device fixedly attached to the rolling mill housing, whereby the inner distance between both guide plates can be variably set at any position parallel to the axis of the rolling roll. Penetrating side guide. 2. The side guide according to claim 1, wherein one guide plate is fixed by a dowel pin.