JPS60191605A - Prevention of hunting in cross rolling - Google Patents

Abstract

PURPOSE:To make easily and selectively products having requested sheet widths by disposing rolls which roll only the part near the transverse center of the sheet material in extreme proximity to the inlet side of cross rolling rolls and rolling the sheet material. CONSTITUTION:Horizontal rolls 3 which roll longitudinally the material near the transverse center of the sheet material are disposed just before the inlet side of cross rolling rolls 1, 2 disposed with inclination by alpha deg. in the angle between a pass line center C and the shaft (d) of width adjusting rolls. A rolling material S is rolled by the rolls 3 and is cross rolled by the rolls 1, 2 right after said rolling. The central part of the sheet material is held restrained by the rolls 3 and therefore the rolling material is prevented from hunting.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a method for preventing meandering of a sheet material for efficiently expanding or reducing the width of the sheet material by width adjustment rolling.

[Prior art]

BACKGROUND ART In recent years, the mainstream method for manufacturing steel plates has been to use continuous casting to form slabs of a constant width, which are then subjected to rough rolling and finish rolling. However, since the product width requested by customers is generally different from the slab width, it is necessary to process the slab width to the product width. For this reason, many width adjustment rolling methods have been developed. For example, width-enlarging rolling methods include the camel rolling method found in Japanese Patent Publication No. 57-15961 and the corrugated rolling method seen in Patent Publication No. 56-1463;
The Edger rolling method and the Special Publication No. 1973 found in Publication No. 619
There are pick-rolling and to-rolling methods as seen in Japanese Patent No. 42732.

However, all of these methods can only adjust the width by either increasing or decreasing the width, so the amount of width adjustment is small. Therefore, as a technique for making a larger width adjustment, Japanese Patent Application No. 57-168471 proposes a ski-roll rolling method that can both expand and reduce the width. However, using only the method shown therein, meandering occurs in the rolled material and width adjustment is not successful. The reason for this is that if the plate material deviates from the center of the pass line and approaches the work side (W), as shown in Fig. Since the timing at which the tip end Sw is bitten by the width adjusting roll 2 is slightly earlier, the plate material shifts to the work side [W] due to the retracting force of the width adjusting roll 2 (the drive side is shown as CD). . Once the plate material begins to shift toward the work side [W], the pulling force of the width adjustment rolling roll 2 increases, so that the rolled material rapidly meanders toward the work side [W], allowing for satisfactory width adjustment. The drawback was that it was not possible.

[Purpose of the invention]

The present invention has discovered that the above-mentioned drawbacks of the conventional method can be overcome by restraining the material to be rolled in the vicinity of the width-adjusting rolls, and provides a technique for efficiently adjusting the width of the plate material using the width-adjusting rolls. It is something to do.

[Structure of the invention]

In the present invention, a roll that restrains the vicinity of the central part of the width of the plate material and is also capable of stretching and rolling that part in the longitudinal direction is disposed immediately adjacent to the entrance side of the width adjusting roll, or a roll that is capable of restraining the vicinity of the central part of the plate material width and is capable of stretching and rolling the part in the longitudinal direction is provided, or immediately after rolling the width adjusting roll is placed adjacent to the exit side of the width adjusting roll. In order to prevent the material from meandering, for example, a vertical roll or the like is provided, and when used in combination with a width adjustment roll, the width of the sheet material can be adjusted efficiently.

〔Example〕

The present invention will be specifically described below based on Examples.

Embodiment 1 As shown in FIG. 2, the center part of the sheet width is placed immediately before the entrance of the width adjusting rolls 1 and 2, which are arranged so that the angle between the pass line center C and the axis d of the width adjusting roll is tilted by α degree. A horizontal roll 3 is provided to roll the material in the vicinity in the longitudinal direction.

The rolled material S is first rolled by horizontal rolls 3 whose roll gap is set to be approximately the same as the upper and lower roll gaps of the width adjusting rolls, so that it has a cross-sectional shape as shown in FIG. Immediately after that, the plate material S is rolled to make it wider by the width adjustment rolls 1゜2, but at this time, the rolling process meanders because the central part of the plate blade is tightly constrained by the horizontal roll 3. There is nothing like that at all.

The plate material after width adjustment rolling has a cross-sectional shape with substantially uniform plate thickness, as shown in FIG. In this way, the plate material can be efficiently rolled by selecting the angle α between the axis of the width adjusting roll and the sline center depending on the required width.

Embodiment 2 As shown in FIG. 3, immediately after the exit of the width adjusting rolls 1 and 2, which are arranged so that the angle between the pass line center C and the axis d of the width adjusting roll is inclined by α degree, both width ends of the plate material are A vertical roll 4 is provided to restrain the portion.

The plate material S is adjusted in width with a predetermined gap between the upper and lower rolls, and rolled to widen it by the rolls 1.2. Immediately after that, it is rolled by the vertical rolls 4 arranged at approximately equal intervals with respect to the base line center C. The board advances with its width edges firmly restrained. In this way, a plate body having a cross-sectional shape as shown in FIG. 5 is formed, but the plate material is then rolled by a horizontal roll (not shown) which is disposed downstream of the width adjusting rolling roll and is capable of rolling the entire width. Then, it is made into a plate material of a constant thickness as shown in FIG.

In this way, the plate material can be efficiently rolled by selecting the angle α between the axis of the width adjusting roll and the pass line center according to the required width.

Note that although these embodiments have been described with respect to the case where the width is widened, the same applies to the case where the width is shortened.

〔Effect of the invention〕

By widening or reducing the width of a plate according to the method of the present invention, products with a required width can be easily and efficiently divided from a slab of a constant width.

[Brief explanation of the drawing]

Figure 1 is a diagram showing the meandering of a plate during width adjustment rolling, Figure 2 is a diagram showing a horizontal roll arranged before the entrance side IK of the width adjustment rolling roll,
Fig. 3 shows a vertical roll installed immediately after the exit side of the width adjustment roll, Fig. 4 shows the cross-sectional shape of the central part of the plate material after rolling with only horizontal rolls, and Fig. 5 1d width adjustment roll. FIG. 6 shows the cross-sectional shape after rolling with a chisel, and FIG. 6 shows the product shape after width-widening rolling. (Explanation of symbols) d...Axis of the width adjustment roll, c...Ya-sline center, α...Angle between the P-sline center and the axis of the width adjustment roll, 1...Drive side Width adjustment roll, 2...
Work side width adjustment roll, 3...Horizontal roll, 4...
Vertical roll, S... Pair of plates, Sn... Driving side tip of plate material, Sw... Tip on production side of plate material, h6 * hl, h
l - plate thickness, bl. b2...Plate width, D...Drive side, W...Work side. L--1---b2--J

Claims (2)

[Claims] (1) In width adjustment rolling, in which rolling rolls are arranged in multiple grades in the width direction of a plate material to be rolled, and the width of the plate material is adjusted by changing the angle formed between the roll axis and the plate material traveling direction, A method for preventing meandering in width adjustment rolling, characterized in that rolling is performed by disposing a roll that rolls only the vicinity of the center of the sheet margin width immediately adjacent to the entrance side of the width adjustment roll. (2) In width adjustment rolling, a plurality of rolling rolls are arranged in the width direction of a plate material to be rolled, and the width of the plate material is adjusted by changing the angle formed between the roll axis and the plate material traveling direction. A method for preventing meandering in width adjustment rolling, characterized in that rolling is carried out by arranging a vertical roll for restraining the sheet margin width end near the exit side 1 of the width adjustment roll.