JPH02229601A - Production of thick steel plate with projection - Google Patents

Abstract

PURPOSE:To prevent the damage of projections by lapping up by working grooves to work rolls in the axial direction thereof and setting the angle on a bite side larger than the angle on a release side in order to prevent the shape collapse of the grooves by the lapping-up of the work rolls. CONSTITUTION:The grooves are worked to the work rolls in the axial direction thereof at a certain length pitch without penetrating the grooves through the rolls to prevent the shape collapse by the lapping up of the work rolls. Since the already roll-molded projections exist at the time of parting the steel plate surface from the roll surfaces, the angle alpha0 of the wall surfaces of the roll grooves is set smaller than the angle alpha1 on the bit side in order to prevent the contact of the peak parts of the projections with the wall surfaces of the roll grooves and the consequent deformation. The thick steel plate with the projections which is entirely free from the damage of the projections by the lapping-up of the work rolls is obtd. in this way. The excellent production process which assures the smooth contact with back up rolls, produces no impact and abnormal noises and do not show the abnormality of patterns, etc., on the roll surfaces is obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for producing a thick steel plate with protrusions, and more particularly to a method for producing a thick steel plate with protrusions parallel to the width direction of the steel plate using rolling work rolls. (Prior art) Thick steel plates with protrusions have traditionally been used, for example, in civil engineering and construction work, for example, when they are laid in trunks or entrances and exits of dump trucks. It is widely used as a steel plate with protrusions to prevent it from being taken out, as well as for concrete filling pipes and as a thin-walled yet highly rigid steel plate, and many proposals have been made regarding its manufacturing method. JP-A-61-119311 discloses a method for rolling a steel plate having protrusions that are continuous in the width direction of the plate, but the inclination angle of the protrusions with respect to the roll body length direction is 45° or less and the following formula: 2W/sinθ, <100 (11 width, θ.

This patent discloses a method for rolling a steel plate having continuous protrusions in the width direction, which is characterized by rolling with a caliber roll that satisfies the following condition: = protrusion inclination angle). The purpose is to use the slope of the entire protrusion to obtain the desired effect, and the protrusion has a wide and gentle profile, which may result in insufficient adhesion to the concrete or the protrusion's effectiveness. It becomes thin.

JP-A No. 60-124406 discloses a rolling roll for a steel plate having a plurality of ridges in the longitudinal direction of the steel plate, which has a plurality of calibers and at least one of caliber width, caliber pitch, and caliber angle. A roll is disclosed in which the height of a plurality of protrusions is made uniform by changing the height of the protrusions sequentially from the central part toward the ends in the axial direction. However, in this case, the direction of the protrusions is in the length direction of the plate, not in the width direction. The purpose is also to make the height of the ridges uniform over the entire width. JP-A-62-54502 discloses a method of rolling a steel plate with protrusions, in which the caliber depth of the roll is made larger than the maximum value of the protrusion height obtained by rolling, and rolling is performed using caliber rolls. At that time, rolling is performed using the required reduction amount according to the following formula. Δt=h・100/η η− r<lung, 51%θ, ↑. , D) However, Δt: required reduction amount, η: print rate - b: caliber width, S2 caliber pitch, θ: caliber angle,
t. : Entrance side plate thickness, D: Roll diameter This method is intended to provide continuous protrusions in the rolling direction, and the necessary rolling amount to make the protrusion height as high as possible is determined according to the above formula. ．． (Problems to be solved by the invention) However, there are some problems with the conventional method. Even when a one-stand rolling mill is used, the position of a thick steel plate with protrusions in the width direction shifts each time it is rolled, causing surface flaws and patterns. Furthermore, when reversing the projections in the longitudinal direction, they may shift slightly in the width direction, or the camber (sideways bending) of the board may press down on the projections that have been formed, causing scratches and patterns. Furthermore, since the longitudinal protrusions are parallel to the rolling direction, the meat flows laterally, and the resulting protrusion height is lower than that of the widthwise protrusions.

On the other hand, for protrusions in the width direction, after the protrusions are formed with a roll, the corner of the caliber that separates from the roll slides up and the protrusions are scraped off. Furthermore, when using a caliber with protrusions extending through the width, the contact with the bank-up roll becomes discontinuous, and there is a high risk of damage to the roll.

Regarding these problems, the above-mentioned prior art does not provide any solutions, and in particular, does not provide any solutions to the caliber angle sliding up and roll damage caused by providing a through caliber.

Thus, an object of the present invention is to provide a method for manufacturing a steel plate provided with protrusions in the width direction of the plate, which effectively eliminates the drawbacks of these conventional techniques.

Still another object of the present invention is to provide a method for producing a thick steel plate with protrusions that eliminates the problems of caliber angle sliding and roll damage caused by providing a penetrating caliber. (Means for Solving the Problems) In order to achieve the above object, the present inventors conducted various studies and found that the height of the protrusions in the longitudinal force direction is saturated even if the rolling reduction rate is increased. However, if this is made into a lateral protrusion, not only will the lateral flow of meat be eliminated, but the flow of meat blocked by the work rolls will be efficiently used to form the protrusion, so the height of the heap will be 1.5 to 3 times higher. Focusing on this, we adopted a method of providing lateral protrusions, and by providing grooves intermittently in the width direction of the roll, we also changed the groove shape to minimize deformation of the protrusions once formed. The present invention was completed based on the knowledge that the above object can be efficiently achieved by defining the above.

That is, the present inventors focused on the advantage of providing protrusions in the width direction, and developed a solution to the above-mentioned problems in the method of forming a large number of parallel protrusions perpendicular to the rolling direction on one side of a thick steel plate. We conducted a thorough investigation and obtained the following knowledge.

■When processing grooves in the axial direction of the rolling work roll according to the desired protrusion arrangement and shape, it is possible to perform groove processing at a certain length pitch without penetrating the roll in the axial direction.Bank-and-roll during rolling The height of the protrusion can be made even higher because sufficient contact with the protrusion can be ensured, and the material can escape not only in the longitudinal direction but also in the width direction. ■Also, in order to prevent the roll from deforming due to sliding up, it is only necessary to make the angle on the engagement side of the groove provided on the work roll at least larger than the angle on the release side, which will allow the work roll to separate from the steel plate. At this time, the protrusions formed by rolling are not damaged by sliding up.

Here, the gist of the present invention is to form a large number of parallel protrusions perpendicular to the rolling direction on one side of a thick steel plate using a rolling work roll equipped with grooves according to the arrangement, shape, and dimensions of the protrusions on the steel plate. When processing the grooves at a certain length pitch without penetrating them in the axial direction of the work roll, and in order to prevent the shape from deforming due to the work roll sliding up, the angle on the engagement side of the groove is changed to the non-engagement side. W. with protrusions, characterized in that it is rolled by work rolls having an angle greater than
This is a method for manufacturing rope plates.

Note that the angle on the biting side refers to the angle between the side of the groove that starts contacting the rope later, that is, the side facing the rotational direction of the work roll, and the tangent to the roll. Angle refers to the angle formed by the tangent to the roll and the side surface of the groove on the side where the steel plate and the roll first end contact after finishing the rolling of the protrusion, that is, the side facing in the opposite direction to the rotational direction of the roll. In the present invention, there are no particular restrictions on the arrangement of the grooves, the pitch between each groove, etc. as long as they are spaced apart in the width direction.
Alternatively, the grooves may be arranged in a staggered manner. In addition, there is no particular limit to the degree of the groove cross-sectional shape when the angle on the engagement side is made larger than the angle on the release side.
In short, it is sufficient to minimize the deformation of the previously formed protrusion when the steel plate and roll are separated.

(effect) The invention will now be further described with reference to the accompanying drawings.

Figure 1 (AJ) is a schematic perspective view of the work roll 1 for carrying out the rolling method according to the present invention, and Figure 1 (CBL) is an explanatory diagram of the cross-sectional shape of the groove 2 provided therein. Although the dimensions are written, the length of one groove is 200 m.
m, the groove spacing is 50a+@, and each row is arranged in a staggered manner, and the spacing between each row is 150 square meters. The angle of the groove 2 on the biting side is 60 m, and the angle on the releasing side is 40''.

FIG. 2(a) is a schematic explanatory diagram showing how the protrusions 3 are slid up by the grooves 2 provided in the work roll 1 when forming the protrusions in the width direction by rolling. Second (b)
The figure is a schematic partial sectional view showing the groove shape on the roll surface. In the figure, angle α1 is the angle on the biting side of groove 2, and α
. is the angle of the groove 2 on the release side.

In Fig. 2 (8) and Fig. 2 Cbl, the steel plate first runs from the left side to the right side as viewed from the drawing, while the work roll 1 rotates in the direction of the arrow in the figure to form protrusions 3 on the surface of the steel plate. I do.

In the present invention, when the steel plate surface separates from the roll surface, since there are already rolled protrusions, the top of the protrusions abuts against the edge of the roll groove, that is, the wall surface on the non-biting side of the roll groove, as shown in the figure. The angle (α) of the wall surface is made smaller than the angle (αI) of the interlocking side to prevent deformation. The angle (α1) on the biting side is preferably an arbitrary angle of 90 degrees or less. Here, the sliding up of the roll is expressed by the following equation.

L++=4π lower “p...(1)Ls”
et (1+ φ F) = \/'ヲ1j7\;--Fu 璽i-・ (1+ φ, 冫 ・ ・ (2》L.-L
m α” = tan-'( )h However, β4 (projected contact length) - f 5]■...t-v
, l φ2 (advanced rate) = V rin (V..t: exit side material speed, v,: roll circumferential speed) As can be seen from the figure, α゛ is the limit angle at which sliding up occurs, and therefore α. Sliding up can be prevented by making α゜ equal to or smaller than α゜. Therefore, α. The absolute minimum allowable angle of α can be determined by calculation according to the rolling conditions, but according to the experimental results of the present inventors, α. ku α、
By doing so, it is possible to sufficiently prevent the protrusion from sliding up. Generally α. : 30 to 50 degrees, α, : 45 to 90 degrees are preferable. By the way, if there is a grooved part, the contact pressure between the work roll and the backup roll can be expressed by the following formula.

As you can see from this, if there is no unprocessed part, the contact pressure near the groove will increase extremely, so it is necessary to arrange the unprocessed part at an appropriate pitch. Therefore, in the present invention, the caliber alternately forms grooved portions and non-grooved portions in the roll axis direction. In other words, the grooves are provided at a certain length pitch without penetrating the work roll in the axial direction. The size of the pitch in the body length direction can be adjusted to the required pitch of the target protrusion. By the way, the rolling process to which the method of the present invention is applied is not particularly limited, but in a two-stand mill, the roughing mill uses a normal roll, and the finishing mill uses a grooved caliber on one side and a flantro roll on the other side. It is preferable that rolling is performed with a finishing pass left in the mill, and only one final pass is rolled in the finishing mill to form protrusions. Since it is formed in one final pass, a steel plate with projections that is excellent in terms of appearance and appearance can be obtained.

The surface shape of the obtained steel plate is such that protrusions are discontinuously arranged in the temporary width direction, as shown in FIGS. 3(a) and 5(a), which will be described later.

Next, the present invention will be explained in more detail with reference to examples thereof.

Example 1 In this example, a work roll (diameter 1000 mm x
length 4830 wmg) and bank unroll (diameter 21
Using a finishing rolling mill equipped with a 4-year-old finishing mill equipped with 0.00 mm x length of 4600 mm, protrusions were formed on a steel plate (JIS 3101 SS41).

The rough mill rolls to 35 x 1524 x 7500 mm, and the finishing mill rolls to 20 x 1524 x 1.
Finish rolling was performed to 3000 mm. As a result, the third
The dimensions and shape (m
A thick steel plate (20 mm thick) 4 with projections 3 of s) was obtained. Approximately three times the peak height was obtained compared to the case of longitudinal protrusions. When the work rolls were inspected after rolling, there was no damage to the work rolls. Example 2 In this example, the work roll (diameter 980 wa x length 4830 mII1) shown in FIGS. 4(a) and 4(b)
1 and a bank unroll (2000 mm in diameter x 4600 mm in length) were used to form protrusions in the width direction on the steel plate. In Figure 4(a), the length of one groove is 200 +u+, and the interval between grooves is 50
It was III1. The grooves 2 are arranged in a staggered manner every row,
The spacing between rows was 120 nu+.

The rough mill rolls to 28 x 1524 x 7300 millimeters, and the finishing mill rolls to 15 x 1524 x 1.
Finish rolling was performed to 3200 mm. As a result, the fifth
A steel plate 4 with protrusions 3 as shown in Figure (a) and No. 5 was obtained. After rolling was completed, an inspection revealed that there was no damage to the work rolls. (Effects of the Invention) As explained above, according to the present invention, the peak height can be secured to be 1.5 times or more compared to the case where the protrusions are provided in the longitudinal force direction, and the protrusions caused by the sliding up of the work roll can be secured. A thick steel plate with projections without any damage can be obtained.

Furthermore, the contact with the back unroll is smooth and there are no shocks or abnormal sounds, and an excellent manufacturing method is obtained in which there are no abnormalities such as patterns on the roll skin.

[Brief explanation of the drawing]

Figure 1(a) is a schematic perspective view of a grooved work roll used in the present invention; Figure ICb) is a partial sectional view of the grooved shape of Figure 1(a);
Fig. 2(a) is a schematic explanatory diagram of how the protrusion slides up; Fig. 2(b) is a partial cross-sectional view of the groove shape in Fig. 2(a); Fig. 3(a) is an example A schematic explanatory diagram of the steel plate with projections obtained in Example 1: Figure 3(b) is a partial cross-sectional view of the projections in Figure 3(a); Figure 4(a) is the work roll used in Example 2. A schematic perspective view of; 4th Cbl is a partial sectional view of the groove shape of the work roll of FIG. 4(a); 5(a) is a schematic explanatory diagram of the thick steel plate with projections obtained in Example 2 and FIG. 5(b) is a partial sectional view of the protrusion in FIG. 5(8). l: Work roll 2: Groove 3: Protrusion 4: Steel plate

Claims (1)

[Claims] When forming a large number of parallel protrusions perpendicular to the rolling direction on one side of a thick steel plate using a rolling work roll equipped with grooves according to the arrangement, shape, and dimensions of the protrusions on the steel plate, the axial direction of the work roll The grooves are machined at a certain length pitch without penetrating the grooves, and in order to prevent the shape from being deformed due to the work roll sliding up, the work roll is made so that the angle on the biting side of the groove is larger than the angle on the releasing side. A method for manufacturing a thick steel plate with protrusions, which comprises rolling.