JPS58103907A - Controlling method for step-sectioned rolling - Google Patents

Abstract

PURPOSE:To accurately perform a step-sectioned rolling without expanding an equipment, by detecting a offset part recognizing mark prepared by a rolling equipment itself at the time of the next pass of step-sectioned rolling and performing a tracking of the offset part. CONSTITUTION:A recognizing mark 80 is stepped to a coil to be cold-rolled in a stage of hot rolling as shown by the figure, and when the coil enters work rolls 41, the coil is rolled while performing a microtracking 70 until it reaches just this side of the mark 80. When the mark 80 arrives just below the rolls 41, the tracking device 70 recognize it by the detection of a load cell 9 that the changing point of rolling-down pressure conforms with the recognizing mark of tracking base point of the step-sectioned rolling. Next, after completion of discriminating the recognizing mark at the top end, a recognizing mark 90 for the next pass is prepared, and successively, a rolling of a stepped part is performed based on the command of a computor 57. After the rolling of this offset part, a recognizing mark 91 of an offset part for the next pass is prepared by operating a rolling-down device 52. The operations mentioned above are performed by prescribed number of passes based on the commands of the computer 57. Thus an accurate step-sectioned rolling is made possible by performing controls of rolling in such a manner.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for controlling step rolling, and particularly to a method for controlling step rolling most suitable for accurately performing step rolling.

Aluminum cold rolling uses unidirectional rolling equipment, and the general characteristics of this aluminum cold rolling are as follows.

(1) Since the demand for Al 2 is in small quantities and in a wide variety of products,
As shown in FIG. 1(a), rolling is performed using a small diameter coil with speed characteristics as shown in FIG. 1(bl).

(2) Due to the high rolling heat, rolling using a tandem rolling mill or continuous reversible rolling using a single rolling mill is not possible, and the rolling equipment requires several passes of unidirectional rolling using a single rolling mill.

Due to the above two characteristics, there are the following drawbacks.

(a) Productivity is low.

(Because there are many small diameter coils, a lot of equipment space is required.

The above-mentioned drawbacks can be overcome by using a large diameter coil as shown in FIG. 2(a) and performing stepped rolling with the speed characteristics as shown in FIG. 2(b).

Here, there has been a conventional technique of step rolling only the final pass, but since a large rolling reduction cannot be achieved with only the final pass, it has not been possible to obtain a product that satisfies the end user.

Therefore, in order to meet the product requirements of end users and create a highly productive rolling facility, it is essential that the cold rolling facility be capable of step rolling from the first pass to the last pass. From the stage of the intermediate rolling equipment to the stage of pR stepped rolling, it has been decided that the rolling process will be carried out. .

However, as shown in Figure 3 (EE rolling equipment has intermediate processing equipment such as pickling between the hot rolling equipment and the cold rolling equipment,
In addition, since the cold rolling equipment and the intermediate bath undergo intermediate processing such as annealing, the accuracy of the stepped portion tracking data L□*L11Lea of the coil as shown in the fourth section deteriorates.

FIG. 5 is a block diagram of a rolling system used in a conventional rolling facility. The backup roll 40 rolls the aluminum material via the work roll 41. The rolled material pulled out from the payoff reel 43 is inserted into the work roll 41 via the defroll roll 42 and passed to the tension reel 44 via the exit side defroll 59. def roll 4
2 is an incoming pulse transmitter 45. Each of the output pulse transmitters 46 is attached to the deflore 59 and outputs a pulse signal according to the rotation of the deflore. Work roll 41 is electric till! 47, and a speed detector 48 is connected to the electric motor 47.

Nine, a load cell 49 is attached to the backup roll 40 to measure the rolling load. The tip and rear end detector 5 east detects that the tip of the rolled material when biting and the coil has finished and the rolled material has been removed from the work roll 41t, and the plate thickness of the rolled material after rolling is detected by the work roll 41t. The thickness is detected by an outlet thickness gauge 51 provided on the outlet side of the roll 41. The amount of reduction for the backup roll 40 is adjusted by a reduction device 52. The lowering device 52 is controlled by a fixed position lowering control device 55 or a constant pressure lowering control device 56, and the selection thereof is made by a tracking device 54. A multi-speed control device 53 is controlled by the output of the tracking device 54 and the output of the speed detector 48, and drives the electric motor 47. A control command for the dragging device 54 is outputted from a control computer 57 and a pulse transmitter 45 or 46. The control computer 57 receives information from the pulse transmitter 4B-ff and is controlled by the coil data management computer 58.

By the way, when υ step rolling is performed by the control device shown in Fig. Wi5, the inlet base material coil of the cold rolling mill shown in Fig. 4 is tracked by the tracking device, and the step rolling is performed while tracking the entire length. If rolling is performed and there is no tracking error, the result will be as shown in FIG. However, when such a device is used, there is a risk of accidents such as rolls running onto stepped portions or roll breakage, which are the most unfavorable conditions for a rolling mill. As mentioned above, in order to prevent rolls from rolling onto the stepped portion, it is sufficient to take measures that can accurately recognize the stepped portion, and the following methods are available for this purpose.

(1) Before cold rolling, punch holes are punched to recognize the stepped portion, and the stepped portion is inserted into the rolling machine. Let's do it.

(2) To recognize the stepped part at the hot rolling equipment stage, we consciously changed the thickness of a part of the front and back of the stepped part, and detected and recognized this point with the entry side thickness needle of the cold aluminum rolling equipment. After that, rolling is performed while accurately tracking the stepped portion. However, such conventional methods have the following drawbacks.

(a) Punching is not preferred in the case of Alden.

(b) JR stepped section wt One puncher is required to make one punch hole.

(C) A thickness needle and a punch hole detector are required to detect the stepped part g identification mark.

Therefore, although it is possible to recognize stepped portions by employing such a method, it increases the cost of equipment and is difficult to employ in reality.

An object of the present invention is to provide a step rolling control method that allows accurate step rolling to be performed without expanding equipment.

In the present invention, the stepped part recognition mark is created by the rolling equipment itself,
By detecting this mark during the next pass of step rolling and tracking the stepped portion, step rolling can be performed accurately.

FIG. 7 is a block diagram showing a preferred embodiment to which the present invention is applied. In FIG. sg7, the same members as those used in the apparatus of FIG. 5 are designated by the symbol. In the embodiment of the present invention, the tracking section is different from the conventional one, and the other configurations are the same as in Fig. @5, so a description thereof will be omitted. The tracking device 70 includes the outputs of the pulse transmitters 45, 46,
In addition to instructions from the computer 57, the output of the load cell 49 is input. The coil subjected to cold rolling is subjected to I knowledge mark 8
A step of 0 is made. This coil is the work roll 41
Once rolled, micro-tracking is performed using the same tracking method as before until it reaches the stepped part recognition mark, and rolling is performed.

When the recognition mark 80 comes directly under the work roll 41 of the rolling mill, the rolling pressure changes, and if the load cell 9 detects that this change point is the position mark of the tracking base point of stepped rolling, the tracking device 70 I can recognize it.

At this point, it is necessary to determine whether this rolling pressure variation is due to a normal plate thickness variation or whether it is a consciously added recognition mark 80. In this method, a determination is made based on whether or not the rolling pressure has varied by a predetermined value or more nine times within a predetermined period of time.

Next, after the recognition mark judgment on the 5-tip side is completed, a round recognition mark 90 for the next pass is created. Next, rolling of the stepped portion is started based on instructions from the computer 57. After completing rolling of this stepped part,
A stepped portion recognition mark 91f@9 for the next pass is created by operating the rolling down device 52 as shown in FIG. In this way, adding 1-t to the rear end @ is the next pass t.If the second pass is performed without intermediate processing of the first pass coil, a mark to identify the stepped part tg will be made in the first pass. This is because the stepped portion recognition mark 91 on the back end side of the eye is symmetrical for detection.

The above steps are similarly performed the required number of passes based on instructions from the computer 57. Then, on the final pass, roll to remove all recognition marks. Therefore, this recognition mark 80, 81.90
．． 91 is set to a size such that the entire amount can be erased in the final pass.

By controlling the rolling as described above, accurate step rolling becomes possible.

In the embodiments of the present invention, the case where the inlet coil of the first pass of the cold rolling equipment is a step-rolled coil and already has a step recognition mark is described above. However, in addition to this, the present invention can also be applied when a coil of a single size enters the first-pass inlet coil of cold rolling equipment, and then a desired stepped rolled coil is obtained by rolling over several passes. can.

In this case, in the first pass, create a stepped part and consciously create a mark for rolling the stepped part t-g, and in the second pass, import the tracking data of the stepped rolling. Let's do it. Thereafter, by using the above-described embodiment as is from the second pass, accurate stepped rolling can be achieved.

According to this embodiment, accurate step rolling is possible regardless of whether the hot rolling equipment has a step rolling function or not, and even with the cold rolling equipment alone, and productivity can be improved.

According to the embodiments of the present invention: (1) Special equipment for creating stepped part recognition marks, which was necessary in the conventional method, is not required.

(2) There is no need for a punch hole detector or an entry side thickness needle, which are unnecessary for direct rolling, as equipment for detecting stepped part recognition marks, which are necessary in the conventional method.

(3) Roll damage due to tracking errors can be prevented. In particular, by determining the number of stepped part recognition marks, the reliability of the data from the host computer can be checked and the mill can be stopped in advance.

Effects such as this can be obtained.

As is clear from the above, according to the present invention, step rolling in cold rolling can be performed accurately.

[Brief explanation of the drawing]

Fig. 1 (a), (b) Explanatory diagram and rolling characteristic diagram of small diameter coil in Jd aluminum cold rolling, Fig. 2 (al, (b)
) is an explanatory diagram and rolling characteristic diagram of a large-diameter coil in aluminum cold rolling, and Figure 3 is a process diagram showing an example of the configuration of rolling equipment.
Fig. 4 is a side view showing the stepped portion of the coil, Fig. 5 is a block diagram of a conventional rolling P6UN machine, Fig. 6 is a side view showing the stepped portion of the coil by conventional stepped follow-up rolling, @7 The figure is a block diagram showing an embodiment of the present invention, Figure @8 is a side view showing the stepped portion of the base material coil on the entry side of the rolling machine according to the present invention, and Figure 9 is a side view of the coil after stepped rolling according to the present invention. FIG. 40... Backup roll, 41... Work roll, 45.46... Pulse transmitter, 47... Electric motor, 48... Speed detector, 49... Load cell, 52
... Reduction device, 53 ... Speed control device, 55 ...
Stereostatic pressure reduction control device, 56... Constant pressure pressure reduction control device, 57
...Control computer, 58...Coil data management computer, 70...Tracking device, 80,81.90.
91... Recognition Ma No. 40 Cod S mouth Upper box also 6, 7th day Ru Sekikata question No. 8 sword, 1

Claims (1)

[Scope of Claims] 1. In a rolling control method for a unidirectional rolling equipment that performs stepped rolling of a material to be rolled, the rolling equipment attaches a stepped part recognition mark to the material to be rolled during the rolling process, and A step rolling control method characterized by detecting and tracking a stepped portion recognition mark during the next pass step rolling. 2. The stepped rolling control method according to claim 1, wherein the stepped portion recognition mark is detected based on a load change during rolling.