JP2009274110A - Method of manufacturing rolled material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make rolling return quickly from manual operation to the original pass schedule by simple calculation. <P>SOLUTION: In a method of manufacturing rolled materials in which rolling is performed by reducing a gap between rolling rolls gradually while making a material passing through between the rolling rolls at plurality of times reciprocatively according to a preset pass schedule, when performing manual rolling by setting a gap different from the gap between the rolling rolls, which is set by the pass schedule, the scheduled gap which has a smaller value than that gap of the above pass schedule and whether the order of the scheduled pass corresponding to the scheduled gap is an odd number or an even number are selected and, after performing the rolling of the number of the necessary passes between that gap and the scheduled gap so as to be the scheduled gap when the odd number or the even number is corresponded, rolling is returned to the automatic rolling on the basis of the pass schedule from the scheduled gap. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a method for manufacturing a rolled material that is rolled by gradually reducing a gap between rolling rolls while passing a material a plurality of times between the rolling rolls according to a preset pass schedule.

  When producing a plate-shaped rolled material from an ingot (slab) such as aluminum having a thickness of about 300 to 650 mm, first, as rough rolling, a temperature of 400 to 550 ° C. or more, for example, above the recrystallization temperature using a reversible rolling mill. Then, it is hot-rolled to a thickness of several tens of mm, further rolled to 20 mm or less with a finish rolling mill, and wound into a cylindrical shape to form a coil.

  Hot rolling by the reversible rolling mill is performed by gradually reducing the gap between the rolling rolls while allowing the material to reciprocate between the rolling rolls before and after the rolling roll. This is a method of reducing the thickness. The individual rolling processes over a plurality of times are automatically controlled according to a preset pass schedule. This pass schedule sets rolling conditions such as the rolling roll rotation direction, roll gap, roll speed, and rolling load for each rolling pass, and is stored, for example, as table data in the control system.

  In hot rolling performed in accordance with this pass schedule, when trouble such as a biting failure occurs, it may be necessary to switch from automatic rolling based on the pass schedule to manual operation for rolling. Then, after the trouble is resolved by the manual rolling, it is desirable to return to the originally scheduled pass schedule so that automatic rolling can be continued.

In the technique described in Patent Document 1, when the operator manually corrects the reduction position (roll gap) in a rolling apparatus having a function of automatically correcting the reduction position according to the deformation resistance of the material, the amount of manual correction Are compared with the automatic correction amount, and the correction amount is corrected while repeating calculations such as multiplying the manual correction amount and the automatic correction amount by a specific coefficient according to the comparison result. Even when returning from the above-described rolling by manual operation to rolling by automatic control, it is conceivable to recalculate the roll gap while adding such correction.
JP-A-6-285526

  However, in the technique described in Patent Document 1, correction is performed by repeating the calculation based on the correction amount at the time of manual operation and the automatic correction amount, so that it is possible to return to the originally scheduled path schedule. However, there is a problem that it is necessary to execute a complicated operation a plurality of times, which increases the load on the system and takes time to recover.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a rolled material manufacturing method capable of quickly returning from a manual operation to an original pass schedule with a simple calculation.

The method for producing a rolled material according to the present invention is a method for producing a rolled material, which is rolled by gradually reducing a gap between the rolling rolls while reciprocating the material a plurality of times between the rolling rolls according to a preset pass schedule. When manual rolling is performed by setting a gap different from the gap between rolling rolls set by the pass schedule, the pass order at the time of manual rolling and whether the pass order is odd or even is recognized. In addition, if the planned gap having a value smaller than the gap and the planned path order corresponding to the planned gap are odd or even are selected from the path schedule, and the odd or even number is a suitable path, After rolling the required number of passes between the gap and the planned gap so as to be the planned gap, Characterized in that to return to the automatic rolling based on the pass schedule from a constant gap.

  That is, even when manual rolling is performed, the pass order and whether it is an odd or even number are counted, and when shifting from manual rolling to automatic rolling, the gap during manual operation from the pass schedule (the gap) A setting gap with a smaller value is selected as the planned gap, and it is recognized whether the path order planned at the time of the setting gap is an odd number or an even number. In order to perform rolling, the number of passes required up to the planned gap is determined depending on whether the current pass is an odd number or an even number, and the rolling up to the planned gap is performed. Then, after returning to the planned gap in the path schedule, control may be performed according to the original path schedule.

  Moreover, in the manufacturing method of the rolled material which concerns on this invention, it rolls by the part of the equal gap which divided the difference of both gaps by the said required number of passes from the said gap to the said scheduled gap. The value obtained by dividing the difference between the gap at the time of manual operation and the scheduled gap of the pass schedule by the number of required passes is used as a single reduction amount, and the amount is reduced by an equal amount.

  According to the method for manufacturing a rolled material of the present invention, even when a manual operation is performed due to trouble or the like, the pass order and the odd or even number are recognized, and the planned gap having a value smaller than the gap at the time of manual operation and the planned gap Select whether the scheduled path order set to odd or even is selected from the path schedule, adjust it so that it becomes a planned gap when the odd or even number of the scheduled path order matches, and return to the path schedule Therefore, it is possible to quickly return from the manual operation to the original pass schedule with a simple calculation, and the productivity is high.

  Hereinafter, one embodiment of a manufacturing method of a rolling material concerning the present invention is described, referring to drawings.

  FIG. 1 shows a rolled material manufacturing apparatus used for carrying out the manufacturing method of the present embodiment, and reference numeral 1 indicates a rolling mill. The rolling mill 1 is provided with a pair of rolling rolls 2 at the top and bottom, and these rolling rolls 2 are driven in both forward and reverse directions by a rotary drive motor 3. Constitutes a so-called four-high rolling mill in which large-diameter backup rolls 4 are in contact with each other. Further, before and after the rolling mill 1, table rollers 5 for conveying the material A are provided.

Then, the upper backup roll 4 is provided with a reduction screw 6 for pressing it, and a reduction means 8 including a position control motor 7 for moving the reduction screw 6 to set the distance between the rolling rolls 2. It has been. Further, a rolling load detecting means 9 such as a load cell for detecting a rolling load from the rolling roll 2 to the material A is provided.
Further, a coolant discharge means 10 for supplying a coolant (rolling oil) is provided in the vicinity of both rolling rolls 2.
Further, the rotation drive motor 3 of the rolling roll 2 is provided with a roll rotation detector 11, a position control motor 7 of the reduction screw 6 is provided with a roll gap position detector 12, and a roller drive motor 13 of the table roller 5 is provided. A roller rotation detector 14 is provided.

Further, in FIG. 1, reference numeral 15 denotes a setup computer. This setup computer 15 includes the interval between the rolling rolls 2 for each pass, the rotational direction and rotational speed of the rolling roll 2, the rolling load, and the table roller 5. It is connected to a controller 16 that executes and manages target values such as a conveyance speed in accordance with a preset pass schedule. Based on the target value of the controller 16, the position control motor 7, the rotary drive motor 3 for the rolling roll 2, the reduction screw 6, the roller drive motor 13 for the table roller 5, etc., output values such as rolling speed and roll gap value. Control with feedback.
In FIG. 1, reference numeral 17 denotes a stripper guide, which is provided before and after the rolling roll 2.

Next, a method for manufacturing a rolled material from an aluminum ingot by the manufacturing apparatus configured as described above will be described.
The aluminum ingot has a thickness of, for example, 300 to 650 mm, and is fed into the rolling mill 1 through a heating furnace (not shown) at a temperature of, for example, 400 to 550 ° C. that is equal to or higher than the recrystallization temperature. . And in this rolling mill 1, it rolls by making an ingot pass between both rolling rolls 2 in multiple times, reducing the gap between the rolling rolls 2 gradually according to the set pass schedule. In the first stage, the gap between the rolling rolls 2 is controlled so as to reduce the thickness by about 5 to 60 mm for each pass.

  In such control, when a trouble such as a material biting failure occurs, automatic rolling based on the pass schedule is switched to rolling by manual operation in accordance with the state of the trouble. And it rolls a required number of times, adjusting a roll gap manually. Also in the case of rolling by this manual operation, the controller 16 recognizes the manual rolling pass order, whether it is odd or even, and the roll gap value when the pass is normally established and completed. Yes.

Next, the rolling by manual operation is terminated and switched to automatic rolling again, and the following passes are adjusted.
First, the closest gap in the pass schedule is selected with a value less than or equal to the manually set gap immediately before switching to automatic rolling.
Next, the path is adjusted so as to return to the automatic rolling from the planned gap. Specifically, the difference between the planned gap in the pass schedule and the current set gap at the time of manual operation is calculated, and the required number of times is rolled as the value obtained by dividing the gap difference by the required number of times. . This necessary number of times is determined from the odd and even numbers of the current path so as to recognize whether the path order of the planned gap is odd or even and matches the odd or even number. In other words, if the odd and even numbers of the planned gap path and the current path are different, the feed direction of the material will be different, so if the gap difference is an appropriate value, rolling from the current path to the planned gap will continue. However, if the odd and even numbers of the planned gap path and the current path are the same, the feed direction of the material is the same, so at least once in the opposite direction before moving to the planned gap. It is necessary to feed material from. The required number of times is determined according to the gap difference.

  Then, when this required number of rollings are finished and the process proceeds to automatic rolling, the planned gap selected in the pass schedule is rolled in a pass that matches the odd and even numbers of the planned pass order allocated to the planned gap. Since the feed direction of the material becomes the same as that at the scheduled pass, the scheduled pass schedule can be smoothly smoothed under the same conditions as when automatic rolling continued even though it was rolled manually until now. It is to be returned to the automatic rolling based on.

The details of rolling by this series of controls will be described with specific examples.
In FIG. 2, the pass order and the set gap (mm) at that time are displayed side by side. As shown in FIG. 2, when the initial pass schedule was set so that the roll gap was reduced by 40 mm from 520 mm, when rolling was attempted by reducing the pass order from 360 mm to the sixth 320 mm. It is assumed that the operation is switched to manual operation due to the occurrence of a trouble, and two passes of 350 mm and 330 mm are manually rolled, and thereafter, it is possible to return to automatic rolling based on the pass schedule.

  Among the future schedules of the pass schedule at this time, the nearest gap which is smaller than the gap 330 mm at the time of rolling by manual operation corresponds to the sixth pass of 320 mm, and this pass is the closest pass from 330 mm. The path in this path schedule is a scheduled path, and the corresponding gap (320 mm) is a scheduled gap. Moreover, since the pass order by manual operation is 6th and 7th, and the last pass is an odd number, if it returns to automatic rolling with this planned gap of 320 mm, the pass order is 6th (actually 8th It becomes even-numbered) and the subsequent pass schedule can be executed without any trouble.

  On the other hand, in the specific example shown in FIG. 3, when the roll gap was set to be reduced by 40 mm from 520 mm in the initial pass schedule, rolling was attempted by reducing the pass order from 520 mm to the second 480 mm. When a trouble occurred, the operation was switched to manual operation, and after rolling with a gap of 490 mm, rolling was continued with manual operation of 460 mm, 420 mm, and 380 mm, and then it became possible to return to automatic rolling based on the pass schedule. Shall.

In the future schedule of the pass schedule at this time, the nearest gap which is smaller than the gap 380 mm at the time of rolling by manual operation corresponds to 360 mm which is the fifth pass order as shown by the broken line arrow in FIG. Since this path is the closest path from 380 mm, the path in this path schedule is set as the scheduled path, and the gap (360 mm) corresponding to this is set as the scheduled gap.

  At this time, rolling is performed five times including the automatic rolling set to the first 520 mm roll gap until the end of rolling with a gap of 380 mm by manual operation. That is, the pass order during manual rolling is fifth and odd. On the other hand, since the planned pass is the fifth and odd number, in order to return to the automatic rolling according to the pass schedule, it is necessary to set a planned gap of 360 mm in the odd-numbered rolling. Since the rolling at the setting gap of 380 mm of manual operation is an odd number at the fifth time, after returning to automatic rolling based on the scheduled pass schedule after one more rolling, the seventh time (the initial pass) The planned gap of 360 mm is set by the fifth (odd) rolling in the schedule. Therefore, the gap is set at a value between 380 mm and 360 mm, and the insufficient rolling for one time is additionally performed. This path adjustment is performed automatically. The adjustment gap value at that time is preferably 370 mm, which is an intermediate value between a planned gap of 360 mm, which is a return point to automatic rolling based on the scheduled pass schedule, and 380 mm at the time of manual rolling.

  Then, after rolling with the gap of 370 mm, when shifting to automatic rolling and performing the subsequent rolling automatically, the planned gap of 360 mm is set at the seventh (5th in the initial pass schedule) odd number of times. That's right. In other words, when returning to this automatic rolling, it is in the same situation as it was rolling on the original pass schedule until then, and it can smoothly return to automatic rolling based on the subsequent scheduled pass schedule. .

  In this way, when returning from rolling by manual operation to automatic rolling based on the pass schedule, the most appropriate gap in the pass schedule is selected depending on whether the manual operation gap and the pass order at that time are odd or even. Then, after adjusting the rolling as necessary to match the odd number or even number of the corresponding pass order, the automatic gap based on the planned pass schedule is returned to the planned gap order of the planned gap and odd number even. Therefore, it is possible to smoothly return to automatic rolling according to the original pass schedule.

  In addition, this invention is not limited to the said embodiment, A various change can be added in the range which does not deviate from the meaning of this invention.

It is a whole lineblock diagram showing one embodiment of a manufacturing device of a rolling material concerning the present invention. It is the figure which contrasted and showed the pass schedule and manual rolling control in the manufacturing method of one Embodiment. It is the figure which showed the modification of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rolling mill 2 Rolling roll 3 Rotation drive motor 4 Backup roll 5 Table roller 6 Screw for reduction 7 Position control motor 8 Reduction means 9 Rolling load detection means 10 Coolant discharge means 11 Roll rotation detector 12 Roll gap position detector 13 Roller drive Motor 14 Roller rotation detector 15 Computer for setup 16 Controller 17 Stripper guide A Material

Claims (2)

According to a preset pass schedule, in the method for producing a rolled material, the material is rolled by reciprocally passing the material a plurality of times between the rolling rolls while gradually reducing the gap between the rolling rolls.
When manual rolling is performed by setting a gap different from the gap between the rolling rolls set by the pass schedule, the pass order at the time of manual rolling and whether the pass order is odd or even is recognized. Then, it is selected from the path schedule whether the planned gap having a value smaller than the gap and the planned path order corresponding to the planned gap is odd or even, and when the path matches the odd or even A method for producing a rolled material, comprising rolling a required number of passes between the gap and the planned gap so as to be a planned gap, and then returning to automatic rolling based on the pass schedule from the planned gap.   The method for producing a rolled material according to claim 1, wherein rolling is performed from the gap to the planned gap by an equal gap obtained by dividing the difference between the two gaps by the required number of passes.

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