JPH02247002A - Method for cold rolling aluminum plate - Google Patents

Abstract

PURPOSE:To prevent flaws from occurring on the surface of a plate in rolling by adjusting the travel speed of the plate so that the ratio of the circumferential speeds of auxiliary rolls to the travel of an Al plate exceed a prescribed value. CONSTITUTION:The circumferential speeds of the auxiliary rolls 1 - 7 and the travel speed of the Al plate S sent in contact with the auxiliary rolls are measured, and both speeds are composed to obtain the ratio of rotation of auxiliary roll. Flaws can be prevented from occurring on the Al rolled plate S' by adjusting the travel speed of the Al plate S so that the ratio of rotation of each auxiliary roll 1 - 7 exceeds a prescribed value.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for cold rolling aluminum. The present invention relates to a cold rolling method that prevents scratches from occurring on the surface.

[Conventional technology]

In cold rolling of an aluminum plate, as shown in FIG. 2, the aluminum plate S unwound from an uncoiler 9 is guided to a rolling pass line through a deflector roll 8, and an auxiliary roll 1. 2.3.4.5.6
and 7 to be introduced into the rolling roll 10. The deflector roll 8 and the auxiliary rolls 1 to 7 are not driven by themselves, but are rotated by the torque generated by temporary contact when the aluminum plate S runs in contact with these rolls.

[Problem to be solved by the invention]

In this case, although it varies depending on the material of the aluminum plate and the rolling conditions, surface scratches may occur on the surface of the aluminum plate S' after rolling, and the occurrence of scratches tends to increase especially when the rolling speed is increased. .

As a result of repeated studies on the relationship between the occurrence of surface scratches and rolling conditions, the inventors found that the occurrence of surface scratches was caused by slippage between the aluminum plate S and the auxiliary rolls 1 to 7. Ta.

The graph in FIG. 3 shows, as an example, the relationship between the running speed 2/s of the aluminum plate S and the circumferential speed ν3 of the auxiliary roll 3. The running speed of aluminum plate S is about 150
Until m/+nin, the auxiliary roll 3 also rotates at the same circumferential speed as the running speed of the aluminum plate S due to temporary contact.
When the running speed of the aluminum plate S becomes dog, the auxiliary roll 3
The rotation of can no longer follow the traveling speed of the board,
Slippage occurs between the aluminum foil 1, the temporary S and the auxiliary roll 3. This slippage causes scratches on the board surface.

The present invention has been made to solve the above-mentioned problems, and its purpose is to provide a method for cold rolling an aluminum plate that can effectively prevent the occurrence of scratches on the plate surface during rolling.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides cold rolling of an aluminum plate in which the aluminum plate unwound from an uncoiler is run through a deflation cooler roll and an auxiliary roll and introduced into a rolling roll. , the circumferential speed of the auxiliary roll is detected, the rotation rate of the auxiliary roll is determined by comparing the circumferential speed and the running speed of the aluminum plate, and the running speed of the aluminum plate is adjusted so that the rotation rate is equal to or higher than a predetermined value. The purpose is to adjust the

[For production]

According to the present invention, the circumferential speed of the auxiliary roll and the running speed of the aluminum plate sent in contact with the auxiliary roll are measured, and the two speeds are compared to determine the rotation rate of the auxiliary roll (peripheral speed of the auxiliary roll/running speed of the plate). (speed), and control the degree of slippage between the aluminum plate and the auxiliary roll by keeping the rotation rate above a predetermined value. Therefore, for example, if you understand the relationship between the rotation rate and the occurrence of surface scratches for each material, you can adjust the running speed of the aluminum plate so that the rotation rate of the auxiliary roll is such that no surface scratches occur. It is possible to prevent the occurrence of scratches.

〔Example] Hereinafter, the present invention will be explained in detail with reference to the drawings.

FIG. 1 is a process explanatory diagram showing an embodiment of the present invention.

The aluminum (anti-S) unwound from the uncoiler 9 is guided to the pass line through the deflector roll 8,
Since the aluminum plate passing through the deflector roll 8 has an angle before and after passing, there is no slippage between the aluminum plate S and the deflector roll 8, and if the rotation of the deflector roll 8 is measured by the sensor 11, the deflector The circumferential speed of the roll 8, that is, the running speed of the aluminum plate can be determined. For example, the running speed of the aluminum plate is detected by measuring the time between pulse oscillations using a sensor that oscillates pulses for each rotation, and inputting the measurement signal to the computer 12 to perform roll diameter correction calculations.

The aluminum plate S that has passed through the deflector roll 8 is
Then, it comes into contact with the auxiliary rolls 1.2.3.4.5.6.7 and is introduced into the rolling roll 10, but the circumferential speed of each auxiliary roll is detected by the sensor 11 and the computer 12 in the same way as described above. The output is compared with the detection signal of the running speed of the aluminum plate obtained from the rotation of the deflector roll 8, and the rotation rate of each auxiliary roll (peripheral speed of the auxiliary roll/running speed of the aluminum plate) is determined. By adjusting the running speed of the aluminum plate S so that the rotation rates of the aluminum plate S' are all above a predetermined value, the occurrence of surface scratches on the rolled aluminum plate S' is prevented.

Table 1 shows the relationship between the rotation rate of the auxiliary roll and the occurrence of scratches on the plate surface when a pure aluminum plate (JIS 1100, plate thickness 1.5 to 2.5 mm) is cold rolled with the roll arrangement shown in Figure 1. This is what is shown.

Table 1 As shown in Table 1, in this case, auxiliary rolls 1 to 1
If the traveling speed of the aluminum plate S is adjusted so that the rotation rate of 7 exceeds 50%, surface scratches can be prevented from occurring.

In the embodiment of FIG. 1, the circumference of all the auxiliary rolls is 9...
Uncoiler 10...rolling port 11...sensor
12...Computer S...Aluminum plate S'...Aluminum rolled plate Applicant: Sumitomo Light Metal Industries Co., Ltd. Agent Patent attorney: Masaya Takahata (one other person) By selecting several auxiliary rolls from among all the auxiliary rolls or selecting one representative auxiliary roll, detecting the roll circumferential speed, and comparing this value with the traveling speed of the plate to determine the rotation rate. It can also be controlled.

〔Effect of the invention〕

As described above, according to the method for cold rolling an aluminum plate according to the present invention, the running speed of the plate is adjusted so that the ratio of the circumferential speed of the auxiliary roll to the running speed of the aluminum plate is a predetermined value. This makes it possible to prevent scratches on the plate surface and facilitate process control.

[Brief explanation of drawings]

Fig. 1 is a process explanatory diagram showing an embodiment of the present invention, Fig. 2 is a process explanatory diagram showing a general cold rolling method for aluminum plates, and Fig. 3 is a process explanatory diagram showing the running speed of the aluminum plate and the auxiliary roll. It is a graph illustrating the relationship with circumferential speed.

Claims (1)

[Claims] 1. In cold rolling of an aluminum plate in which an aluminum plate unwound from an uncoiler is run through a deflector roll and an auxiliary roll and introduced into a rolling roll, the circumferential speed of the auxiliary roll is detected, and the circumferential speed is and the running speed of the aluminum plate to determine the rotation rate of the auxiliary roll, and the running speed of the aluminum plate is adjusted so that the rotation rate is equal to or higher than a predetermined value. . 2. The method for cold rolling an aluminum plate according to claim 1, wherein the running speed of the aluminum plate is adjusted so that the rotation rate exceeds 50%.