JPS5870902A - Rolling method by broadside rolling reduction - Google Patents

Abstract

PURPOSE:To decrease the formation of the fish tails specific to rolling of slabs, etc. by broadside rolling reduction by using caliber rolls and press dies properly in each rolling pass. CONSTITUTION:A rolling mill is constituted of vertical rolls 22 having calibers 1 and press dies 21. First, a material 20 to be rolled is fed into the rolling mill and the preceding end thereof is pressed (4-a) with the dies 21. Thereafer, the dies are changed over to the rolls 1, by which the material is subjected to rolling by broadside rolling reduction (40-b) for the 1st pass. Again the rolls are changed over to the dies 21 and the succeeding end of the material 20 is pressed (4-c). Further the dies are changed over to the rolls 1 and the material is subjected to rolling by broadside reduction (4-d) for the 2nd pass. Thereafter the material is rolled by broadside rolling reduction until necessary width is obtained, and the required pressing is completed with the least times of passes.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a rolling machine using a vertical rolling mill having a caliber roll and a press die in the same machine, and in each rolling arm, the caliber roll and the press die are rolled. ! ! ! This is a book about a rolling method that reduces the formation of fishtails that are characteristic of width reduction rolling of slabs, etc., by appropriately using the following methods.

After width rolling of slabs, etc. using a vertical rolling mill with a caliber rule, horizontal rolling is applied using a horizontal rolling mill.
This fishtail causes an increase in crop loss and a decrease in rolling yield. Single-dot chain l in Figure 1
s indicates a cutting line.

As a countermeasure for this, the corner of the tip of the slab before rolling was press-formed*, as shown in Figure 2.
It has become clear that width reduction rolling using rolls reduces fishtails and improves yield when horizontal rolling is performed.

As a means to achieve the above effect, a press mold is disposed in contact with a caliber roll and a part of the caliber of the caliber roll in the axial direction, and the caliber roll and the press mold are integrated. By moving it in the axial direction, the same machine can perform two types of operations: press forming and rolling.
A width-reducing rolling mill was devised that could perform e. Its structure is shown in FIG.

In order to effectively exhibit the features of the above-mentioned crushing machine, the present invention has the following features:
The amount of reduction per width of the material to be rolled, and the required number of knocks.

According to the following conditions, the most advantageous rolling method is proposed.

The present invention will be described in detail below based on the figures.

FIG. 3 shows an example of a rolling mill that provides the rolling method of the present invention.

In this rolling mill, a press die 2 is disposed adjacent in the axial direction to a vertical roll 12 having carino rolls 1.

The vertical roll 12 is mounted on a bearing stand 3, and the press mold 2 is mounted on itself or on the bearing stand 3.

Both are engaged with the intermediate housing 4 so as to be movable in the roll axis direction.

A shift device 15 for moving the press die 2 and the vertical roll It integrally in the axial direction is locked to the intermediate nozzle 4. Reference numeral 6 denotes a hydraulic cylinder for press forming, which engages with the tip of the reduction screw 7.

＼ The reduction screw 21 engages with the reduction nut 9 housed in the building housing 8, and the reduction motor 10° and the reduction worm 1
1, and is moved through a hydraulic cylinder/-6 to match the width of the intermediate housing 4Yr to be rolled.

Although not shown, the intermediate housing 4 is engaged with the roll housing 8 movably in the material width direction and fixedly engaged in the axial direction of the roll 12.

According to the rolling mill having the structure shown in this figure, due to the function K of the roll lifting device 5, when this rolling mill is used, it is used as a vertical roll rolling mill to perform width reduction rolling, and at other times, it is used as a press to perform die forming and rolling. It can be seen that the rolling mill can be switched freely.

By utilizing the structural features of this rolling mill, we have devised the most effective rolling method that accommodates various conditions, and the details are as follows.
This will be explained according to the t diagram.

From FIG. 4 to 7111, the press metal 11121 or the right side of the rolling roll 22 is the upstream side of the rolling mill.

The left side shows the downstream side.

In Fig. 4, reference numeral 20 indicates the material to be rolled, 21 indicates a press mold for press forming, and 22 indicates a caliber roll for width reduction rolling. shows.

In Fig. 4, when the material to be rolled 20 is sent into the rolling mill, the tip is press-formed at 4-a.Next, the rolling mill is switched from a press mold to a caliber four-wheel, and at 4-b. l
After width reduction rolling is performed for each pass, the caliber roll is again switched to a press mold, and the rear end of the rolled material is press-formed in step 4-c.

Next, switch the press mold to force V no. 9-g-le again and
In step d, a second pass of width reduction rolling is performed, and width reduction rolling is performed until a required width of 4-C or less is obtained.

The feature of this rolling method is that it completes the necessary press forming with the least number of passes (including blank/R pass) compared to other rolling methods described below.

Since the predetermined A-spacing time is short, the drop in hot water temperature due to heat dissipation of a relatively thin material can be minimized, and since the rolling pitch is short, the production volume is the highest. Furthermore, this rolling method is effective when the required number of width reduction rolling passes is an odd number.

FIG. 5 shows another rolling method.

The material to be rolled is subjected to width reduction rolling at the 1st and 7th passes in 5-a, and then switched to a Carino 9-4-ru T press mold in 5-b.
The rear end of the material is press-formed.

Next, switch to the caliber roll again and perform the second pass width reduction rolling at 5-C. 1st Next, switch to the press metal lid again and press the tip of the material at 5-d. 6. Next, use the caliber roll again. The width reduction rolling is performed for the third pass at step 5-, and the width reduction rolling is thereafter performed until the required width is obtained.

The feature of this rolling method is particularly effective when it is necessary to perform slight width reduction rolling for the purpose of scale breaking or the like at the first cut. Further, there is also the advantage that there is no need for a fertilization pass when the width reduction rolling is completed after an odd number of rolls, as in FIG. 4.

Figure jI6 shows yet another rolling method.

The material to be rolled is subjected to width reduction rolling for the 1st and 4th stitches at 6-a, and then upwardly rolled for width reduction for the 2nd arm section at 6-b.
Next, switch the potash/9-roll to a press mold and 6-c
K ”C Press-form the rear end of the material, then perform the empty arm meeting once and press-form the rear end of the material in 6-d.0
Next, switch to the caliber roll and perform the third pass of width rolling at 6-.Then, rolling is repeated with the tube that obtains the specified OS.The feature of this rolling method is that when the amount of width reduction is large, the press In order to maintain the effect of forming, width reduction rolling is sometimes divided into a stage before and a stage after press forming.

In addition, if width rolling is carried out before press rolling as in the example in Fig. 5, and if the 1st and 9th slots are not light rolling, dog lines will grow in this first stage rolling, which will cause an increase in the ische tail. Therefore, it is preferable to make the reduction in the earlier stage lighter than that in the latter stage to prevent an increase in fishtail.In any case, in the rolling method of the present invention, press forming The width reduction rolling passes before and after are not necessarily required to be strongly rolled, but may be lightly rolled for the purpose of scale breaking.

Also, as another means for preventing the occurrence of fishtails due to width reduction rolling prior to press forming.

During one pass of the rolled material in the width reduction rolling in the previous stage,
An effective method is to make the rolling reduction on the exit side lighter compared to the rolling reduction on the entry side in the rolling direction to minimize the occurrence of dog lines (
Figure 7).

As shown in Fig. 6, when performing reverse arm width reduction rolling after this rolling method, use the same method as for the 1/3-thread to perform light reduction at 1 no. [Do not apply strong pressure, and apply light pressure to the rear of the second nozzle.] It is even more effective to prevent the growth of fishtails at both ends.

*81111 shows another 8E rolling method.

The tip of the pressurized building material is press-formed using an 8-shoe. The ridge is then blanked once, and the final press is formed with 8-bFc. Next, switch to the Carinol four-wheel and perform width reduction rolling on the first arm, and then roll with O to obtain the specified width. The feature of this rolling method is that the press gold layer after material penetration and the rolling process are repeated only once. The disadvantage of this rolling method is that it has the effect of shortening the rolling pitch, and even when the material to be rolled is short, the idle time during press forming is short, resulting in a small percentage of wasted time. is reduced. Moreover, it is thought to be effective even if adopted when the final A path is an even number path.

[Brief explanation of drawings]

FIG. 1 is a three-dimensional perspective view showing a part of the material to be rolled. FIG. 2 is a three-dimensional perspective view showing a part of the material to be rolled. FIG. 3 is a longitudinal sectional view of a rolling mill for carrying out the method of the present invention. 4 to 8 are exemplary diagrams showing the rolling method of the present invention. l...Caliber, 2.21...Press mold, 3...
- Bearing stand, 4... intermediate housing, 5... shift device. 6... Hydraulic cylinder, 7... Reduction screw, 8
... i-le housing, 9... pressure reduction), 10...
・Down motor, It...down worm, 12.22
...Vertical roll, 20... Material to be rolled. Agent Patent Attorney Masa Aki Sawa Mitsunobu 2 Nai Izu

Claims (1)

[Scope of Claims] (]) A caliber roll, a press die is disposed adjacent to a portion of the caliber roll in the axial direction, and the caliber roll and the press die are integrated in the axial direction of the roll. After rolling with a width reduction type vertical rolling mill configured to be movable to Width reduction rolling was carried out, and the first step was again switched to a press mold to form the other end, and after death, the roll was switched to a caliber roll. A width reduction rolling method characterized in that width reduction rolling is then performed until a required width is obtained. (2) For the material to be rolled, the first pass of width reduction was carried out on the bales, the press metal IIK was switched to form the first end, and then the first pass was changed to the Carino roll and the second pass of width reduction was carried out. After that, the method is changed again to the press metal 11 to form the other end, and then the process is changed to the Kalinor four-wheel again, after which width reduction rolling is performed to obtain the required width. The width reduction rolling method according to scope (1). (3) After performing width reduction rolling on the L/arm and 2A stitches on the material to be rolled, switch to a press mold to form the edges, and then perform an empty punch for one arm. After that, the other end is press-formed, and then the roll is switched again to the Carino roll, and thereafter the width reduction is rolled to the required width. The width reduction rolling method described. (4) A bale made of 1lili't press molded material to be rolled. 9 passes [1st pass, press forming the other end, 1st caliber
The width reduction rolling method according to claim 1, characterized in that the width reduction rolling is performed by switching to a roll and thereafter performing width reduction rolling until a required width is obtained. (5) In the compression arm before end forming with a press die, only the rear end of the material to be rolled should be lightly rolled down. A width reduction rolling method according to claim 11, characterized in that the fishtail is reduced by reducing the width reduction rolling method according to claim 11. 9. The width reduction rolling method according to claim 1, wherein the fishtail formed before the 7P-less molding is reduced by slightly reducing the rolling width at the ridge.