JPS5844902A - Edging method for slab - Google Patents

Abstract

PURPOSE:To edge a number of kinds of slabs with single anvils in edging of slabs by pressing a pair of right and left anvils having arc-shaped grooves along the edges of the slabs on both sides of the slabs. CONSTITUTION:In the stage of pressing a slab 2 in the width direction from both sides thereof with a side press and subjecting the same to edging, a pair of right and left anvils 3 having arc-shaped grooves are used. For example, the radius (r) of the bottom roundness of the anvils 3 is set at about 114mm. and the central angle theta2 of the arc at about 150 deg.. Here, the width B' of the bottom round area of the arc grooves is regulated to about 190mm., the half angle theta3 of the taper on the side wall of the calibers to about 15 deg. and the depth D' of the grooves to about 250mm.. If the slab is subjected to about 200mm. edging with about 220mm. and abut 165mm. slab thicknesses, the width of the strips is adjusted satisfactorily.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention is a method for compressing slab width, in which a single anvil is used to apply clamping pressure in the slab width direction using a side press, and a single anvil is compatible with slabs of different thicknesses. The purpose of the present invention is to provide a method for adjusting the width of a slab, which is devised so as to advantageously increase the efficiency of adjusting the width of a sheet bar rolled in a sheet bar.

Conventionally, as an example of a slab width killing method that improves the efficiency of plate width adjustment, an anvil pair/with a box-shaped tapered groove is used as shown in Fig. 1. Press it in the direction of its convergence to reduce its width, and then pass it through.
Rolled into sheet bars using conventional continuous hot rolling equipment. However, when trying to use an anvil pair with such a tab bar groove to handle slabs of different thicknesses, there is no problem if the slab thickness T and #iIB at the bottom of the groove are almost equal, as shown in the figure l/. However, when pressing a slab with a thinner thickness T than B, the thickness increases more sharply at the ends than at the center in the width direction of the slab, as shown in the figure. . Therefore, there is a drawback that the metal 70- toward the width end portion becomes larger due to subsequent rolling, and the efficiency of adjusting the plate width decreases.

In order to solve this drawback, it is necessary to prepare various anvils corresponding to the step thickness 5, which results in disadvantages such as a decrease in work efficiency due to anvil replacement work and complication of anvil management.

Therefore, a single anvil can accommodate several different step thicknesses.
Furthermore, this invention was arrived at through numerous studies and experiments regarding an anvil that can advantageously increase the efficiency of adjusting the plate width.

In other words, when we conducted hot rolling experiments by changing the groove shape of the anvil and pressing slabs with different thicknesses, we found that, especially when the groove shape of the anvil was written as an arc, the width of the plate could be improved even if the thickness of the slab changed to several types. It was found that the adjustment efficiency increases.

Hereinafter, the method for killing slabs according to the present invention will be explained in detail based on experiments. First, the inventors investigated the influence of the groove shape of the anvil on the relationship between width al efficiency and slab thickness through experiments on hot steel.
Assuming that λOO■・ and length are constant at 5ooQ■,
The slab thickness is 0*, /90. .

The groove shape of the anvil was changed to 3 levels of 765 m5, and the groove shape of the anvil was added to the box-shaped anvil 1 shown in Figure 1, the arc-shaped groove-shaped anvil 3 shown in Figure 3, and the adette anvil 311 for comparison. - Using a similar anvil, divide the entire length of the slab and perform a width reduction of KOOO■, then total width reduction J
QQ 11111. Continuous rolling of horizontal rolling to width rolling to horizontal rolling with a total thickness reduction of jl 100 sm was performed to examine the plate width adjustment efficiency. The shape and dimensions of the box-shaped anvil used here are as shown in Figure 981, with the groove bottom width B of the tapered groove equal to the maximum thickness of the slab, 2-〇〇〇, and the taper half-width l of the side wall of the tapered groove as /JJ0. , groove depth D
was set at 266 am. Next, the dimensions of the arcuate groove-shaped anvil shape are determined by setting the radius r of the bottom light to 11q m according to Fig. 3.
If the center angle I2 of the arc is 1so0, then the radius B' of the bottom round area of the arc groove is /90, -, the taper half angle I3 of the hole-shaped side wall is /j', and the groove depth D' is -jO■ Closed. The experimental results are shown in section 1g. As is clear from this, it can be seen that the arcuate groove-shaped anvil has superior plate width adjustment efficiency even at 3-f class slab thickness compared to the box-shaped anvil. Examples of the invention will be described. Using the arcuate groove-shaped anvil shown in Figure 3, create a slab with a thickness of 2 cm.
For one type of 743 m, it was divided over the entire length in the radius direction and compressed by t width reduction - 001111+, then rolled with a total width reduction of 200 ■ total thickness reduction ivy ss + and comparative study of deformation characteristics. did. FIG. 5 shows the cross-sectional shape of the slab after it has been compressed.

In this figure, (ke) is when the slab thickness is 220cm;
b)・is l≦! − This is the case. As is clear from this, even if the thickness changes, the peak position (D,) of the thickness after clamping in the width direction is pushed far away from the edge of the sheet width, so the width and return during subsequent horizontal rolling will be It becomes less. Another effect is that the dogbone that tends to occur during the next vertical rolling is absorbed by the convex portion T formed by the arcuate groove, so the width return during the next pass of horizontal rolling is reduced, and these two effects combine to improve the plate strength. The width adjustment efficiency has been significantly improved.

As mentioned above, according to the slab width reduction method invented by Kome, even if slabs of different thicknesses are compressed with a single anvil, the width of the sheet bar rolled in subsequent continuous hot rolling equipment can be reduced. Adjustment efficiency can be advantageously improved, which improves work efficiency by reducing the number of anvil replacements, and simplifies anvil and U-processing.
It is possible to advantageously reduce the cost of anvil production. Note that the slab width cutting method according to the present invention is also effective in reducing the crop cut length generated at the leading and trailing ends, and in this case, only the longitudinal end regions of the slab are cut in advance in the width direction. Just apply pressure.

The method for killing slabs according to the present invention is not limited to the above-described embodiments, but also involves disposing a side press machine having a pair of arc-shaped anvils on the line of continuous casting equipment, thereby reducing the width of the slab. Of course, the objective can also be achieved by applying pressure in the direction and then performing continuous hot rolling.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram showing the state when compressing in the width direction with a conventional box-shaped anvil, and Figure 2 is an explanatory diagram showing the condition of a conventional box-shaped anvil in which the slab thickness is thinner than the groove bottom thickness of the anvil part in the width direction. Figure 3 is an explanatory diagram showing the state when clamping in the width direction with the arc-shaped anvil according to the present invention, A) is a plan view, and (B) is a front view. FIG. 4 is a comparison diagram showing the influence of the anvil shape on the relationship between slab thickness and plate width adjustment efficiency, and FIG. FIG. 3 is a cross-sectional view showing how slabs with different thicknesses are compressed in the width direction with an arc groove-shaped anvil.

Claims (1)

[Claims] L When performing width killing by squeezing the slab in the board width direction from both sides with a side press, width killing is performed by pressing a pair of left and right anvils with arc-shaped miso along the edges of the slab on both sides of the slab. A slab width cutting method featuring: