JPH07251207A - Rolling mill - Google Patents

Abstract

PURPOSE:To provide a rolling mill whose working efficiency and productivity are improved. CONSTITUTION:The strip 11 which is fed to rolling rolls 13, 14 is rolled under the state that tension is imparted with pinch rolls 15, 16 and the rolled strip is cut down into a prescribed length with a flying shear 17. At this time, the feed rate of the rolled strip 11 is measured with a feed rate measuring instrument 26, the driving of the pinch rolls 15, 16 is controlled with a controller 22 based on this measured value, the thickness of the rolled strip 11 is measured with a thickness gage 25. And also, by measuring the roll gap between the rolling rolls 13, 14 with a roll gap sensor 21, the roll gap is adjusted based on this measured value and the temp. control is executed so as to be uniform in the direction of the axis of rotation of roll with roll heaters 24 which are incorporated in the rolling rolls 13, 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling mill for rolling aluminum strips for aircraft and the like, and is particularly useful when applied to the processing of rolled parts whose strip thickness continuously changes in the longitudinal direction of the strip. It is a thing.

[0002]

2. Description of the Related Art FIG. 10 is a schematic showing a rolling method by a conventional rolling mill, FIG. 11 is an explanation showing a rolled state of a strip, and FIG.
FIG. 13 shows the deformation of the rolling roll due to heat generation, and FIG. 13 shows the thermal expansion deformation of the rolling roll.

As shown in FIG. 10, an aluminum-made strip 101 wound into a coil is shaped into a flat plate by a leveler 102 and cut into a predetermined length by a cut-off machine 103 to produce a strip 104. . Then, the worker inserts the strips 104 one by one into a pair of rolling rolls 10
The rolling rolls 105 are driven during the period of 5 minutes, and the rolling rolls 105 are driven by an operation command from the controller 106, and rolling is performed based on the sheet thickness data set in the program in advance.

After the completion of rolling, the operator measures the plate thickness of the rolled material with the plate thickness gauge 107, compares the error between the measured data and the program value, and determines the correction value for the next rolling process. Ask. Then, this correction value is used by the controller 1
The value is input to 06, and the next rolling is performed based on the plate thickness data corrected by this correction value.

By the way, during this rolling process, as shown in FIG.
As shown in FIG. 1, when rolling is repeated, heat is generated due to friction between the strip material 104 and the surface of the pair of rolling rolls 105, and as shown in FIG.
No. 05 expands when heat is generated with respect to the roll diameter at room temperature. As shown in FIG. 13, the thermal expansion of the rolling roll 105 changes the thermal crown of the rolling roll 105 to cause variations in rolling processing accuracy, and the heat of the rolling roll 105 causes the temperature of the rolling oil to rise. Rolling conditions change due to repeated rolling, such as affecting viscosity. Therefore, conventionally, as described above,
Every time rolling was performed, the operator measured the plate thickness of the rolled material, adjusted the interval between the rolling rolls based on the measured data, and performed the next rolling process.

[0006]

In the above-described conventional rolling method, each time an operator rolls, the thickness of the rolled material is measured to adjust the interval between the rolling rolls. There is a problem that the workability is not good because it is troublesome and requires a long working time. Then, in this adjustment work, when processing rolled parts whose plate thickness continuously changes, the plate thickness must be kept within the specified plate thickness, and the interval between the upper and lower rolling rolls is an optimum value. Therefore, it becomes difficult to determine the correction value, and it is necessary to carry out an experiment each time, and the work efficiency is not good. Moreover, this operation must be performed by a skilled worker, and training of a skilled worker is also required.

Further, as described above, when the rolling rolls are thermally expanded and the thermal crown is changed during repeated rolling operations, the rolling precision is impaired. Therefore, it is necessary to set a long rolling interval in order to prevent heat generation of the rolls. However, this causes a problem that continuous rolling work cannot be performed and work efficiency is reduced.

Further, in the conventional rolling method, as shown in FIG.
As shown in, the coiled strip material is
Cut into strips 104a, and the strips 104a
Are supplied to the rolling rolls 105 one by one to perform rolling and pressure.
The rolled material 104b was manufactured. And rolled material after rolling
Marks 104b on the front and back with the marking device 108
is doing. In this case, as shown in FIG.
Booklet 104a length L ₀Against rolled material 104 after rolling
length of b₁Has become longer and has an extension amount of 2M. So
Then, the length L of this rolled material 104b₁Stamped against
P₁, P₂Length L sandwiched between₂Is the product length, before
The product is completed by cutting the rear end parts 104c and 104d.
To achieve.

As described above, the length L ₀ of the strip material 104a before rolling is determined by the rolling rate, the material thickness and the like, and the extension amount after rolling is taken into consideration. However, determining the length L ₀ of the strip 104a is difficult and cumbersome, and if the determination is made in consideration of the safety of the product, the length L ₁ of the rolled material 104b after the rolling is changed to the front and rear end portions 104c. ，
There is a problem that the amount of cutting 104d increases and the yield deteriorates.

The present invention solves such problems, and an object of the present invention is to provide a rolling mill with improved working efficiency and productivity.

[0011]

A rolling mill of the present invention for achieving the above-mentioned object holds a pair of rolling rolls which hold a strip material for rolling and which has an adjustable roll interval, and A pinch roll that gives tension to the strip,
In a rolling mill having a cutter that cuts a rolled strip into a predetermined length, a feed amount measuring device that measures a feed amount of the rolled strip, and a thickness of the rolled strip is measured. A sheet thickness measuring instrument, a roll distance measuring instrument that measures the roll interval of the pair of rolling rolls, a heater built in the pair of rolling rolls, and the pinch based on the measurement result of the feed amount measuring instrument. Pinch roll drive control means for controlling the drive of the rolls, rolling roll distance adjusting means for adjusting the roll distance of the rolling rolls based on the measurement results of the plate thickness measuring instrument and the roll distance measuring instrument, and the heater are operated. Then, a rolling roll temperature control means for controlling the temperature so that the temperature of the pair of rolling rolls becomes uniform in the rotation axis direction is provided.

[0012]

The strip material supplied to the pair of rolling rolls is rolled with tension applied by the pinch rolls, and the strip material is cut into a predetermined length by a cutter. At this time, the feed amount of the rolled strip is measured by the feed amount measuring device, the pinch roll drive control means controls the drive of the pinch roll based on the measured feed amount of the strip, and is also rolled. The thickness of the strip is measured by the plate thickness measuring instrument, and the roll interval of the pair of rolling rolls is measured by the roll distance measuring instrument, and the rolling roll interval adjusting means measures the plate thickness of the rolled material and the rolling roll interval. The roll spacing of this rolling roll is adjusted based on.
Further, the rolling roll temperature control means operates a heater incorporated in the rolling roll to control the roll temperature so that the rolling roll has a uniform temperature in the rotation axis direction.

[0013]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 is a schematic showing a rolling method by a rolling mill according to an embodiment of the present invention, FIG. 2 is an explanation showing a rolled state of a strip material, FIG. 3 is a front view of a rolling roll, and FIG. 4 is a Y-axis correction. An outline for explaining the control method, an outline for explaining the X-axis correction control method in FIG. 5, an outline for showing the rolling step in FIG. 6, an outline for explaining the yield of rolled material in FIG. 7, and an outline in FIG. The system block of the rolling mill according to this embodiment is shown in FIG. 9, and the outline of the processing of the rolling mill according to this embodiment is shown.

The rolling mill of the present embodiment, as shown in FIG.
A leveler 12 for molding a coil-shaped aluminum material 11 into a flat plate shape, and a pair of rolling rolls 13 and 1 capable of rolling the material 11 and adjusting the roll spacing.
4, a pair of pinch rolls 15 and 16 for applying tension to the running strip 11 and a flying shear 17 for cutting the rolled strip 11 into a predetermined length. Then, this rolling mill, as shown in FIG.
By changing the roll interval between the pair of rolling rolls 13 and 14 during the rolling of No. 1, it is possible to process a rolled part whose strip thickness continuously changes in the longitudinal direction of the strip 11.

In this rolling mill, the feed amount control, strip thickness control, and tension control of the strip material 11 to be rolled can be automatically performed. That is, as shown in FIG.
The pair of rolling rolls 13 and 14 is provided with a gap sensor 21 that measures the gap between the rolling rolls 13 and 14, and the measurement result can be output to the control device 22. Further, as shown in FIG. 3, a pair of rolling rolls 1
The charging holes 23 are formed in the shaft centers 3 and 14, and the roll heaters 24 are mounted in the charging holes 23 at the shaft end sides of the rolling rolls 13 and 14, respectively. The roll heater 24 is connected to a control device 22 so that the operation can be controlled. The control device 22 rolls the strip material 11 and heats the central portions of the rolling rolls 13 and 14 when the roll heater 24 is heated. Is operated to control the temperature so that the rolling rolls 13 and 14 have a uniform temperature in the rotation axis direction.

Further, a plate thickness gauge 25 for measuring the thickness of the rolled strip 11 is arranged between the rolling rolls 13 and 14 and the pinch rolls 15 and 16, and the measurement result is controlled by a controller. It is possible to output to 22.
Then, the control device 22 compares the measured value of the rolled strip 11 measured by the plate thickness gauge 25 with a preset reference value to calculate a correction value, and uses the measurement result of the gap sensor 21. To adjust the roll interval between the rolling rolls 13 and 14. Further, a feed amount measuring device (rotary encoder) 26 for measuring the feed amount of the rolled strip 11 is provided adjacent to the plate thickness gauge 25, and the measurement result is output to the control device 22. You can do it. Then, based on the measurement result of the feed amount measuring device 26, the control device 22 calculates a correction value from the rolling length when the strip material 11 is subjected to the rolling process in which the plate thickness is continuously changed, and the pinch roll. The drive of 15 and 16 is controlled.

Further, the control device 22 controls the driving of the pinch rolls 15 and 16 from the measured value of the strip material 11 before rolling and the roll interval measured by the gap sensor 21 to control the pulling speed of the strip material 11. is doing.

As shown in FIGS. 1 and 8, the control device 22 is connected with a monitor 27 for the operator to check the measurement results of various sensors, a printer 28 for launching, and a keyboard 29 for inputting data. .

Here, a specific rolling method and control method for the rolling mill of this embodiment will be described. As shown in FIG. 8, an aluminum-based strip material 11 wound in a coil shape is formed into a flat plate shape by a leveler 12, and a pair of rolling rolls 1 is formed.
3 and 14 are supplied. Then, at this time, tension is applied to the running strip 11 by the pair of pinch rolls 15 and 16, and the strip 11 is in this state.
A predetermined rolling process is performed by 3, 14 and then a predetermined length is cut by the flying shear 17.

At this time, the plate thickness gauge 25 is the rolled strip 1
The plate thickness of No. 1 is measured and output to the controller 22, and the controller 2
2 compares the actual measurement value of the rolled strip material 11 with a preset reference value to calculate a correction value, and uses the gap sensor 21 to adjust the roll interval between the rolling rolls 13 and 14. That is, the indicated value of the roll interval can be calculated by the following formula 1.

The roll interval instruction value is Y _com , and the plate thickness correction value (mill constant: a roll interval correction foot for correcting the elongation of the entire rolling mill when the pressure is applied to the rolling roll, the roll deflection, etc.) back coefficient) K2, the program value of the plate thickness setting the operator inputs Y _prog, extra to compensate the amount of returning to a thickness original strip material after rolling sheet thickness correction value (strips The springback correction value for thin rolling is C _com , R is the roll deformation amount (corrected in real time), and the load cell (load cell) instruction value G of the rolling rolls 13 and 15 is used as the first rolling process. Calculate.

[0023]

[Equation 1]

In the second and subsequent rolling processes,
The roll spacing reading is lowered considering the first rolling data.
The calculation is performed according to the following mathematical formula 2. The maximum program value
To Y _max, The minimum program value is Y_min, The last rolling
Large measurement value is y_max, Y is the minimum measured value during the previous rolling_min,
Parameter coefficient is A (usually 1)
Calculation of rolling processing is performed.

[0025]

[Equation 2]

Therefore, the control device 22 controls the rolling roll 1 based on the instruction value Y _com of the roll distance calculated in this way.
Adjust the roll spacing of 3,14. Generally, when rolling is performed by controlling only the program value, the rolling is performed thicker than the input value. In this embodiment, the roll interval instruction value Y _com is calculated so that the rolling can be performed according to the input value. The roll interval instruction value Y _com can be represented by the graph shown in FIG.

Further, the strip 1 made of the rolling rolls 13 and 14
In the present embodiment, at the time of the rolling process of No. 1, the strip material 11 is subjected to the rolling process in which the plate thickness continuously changes, and the feed amount measuring device 26 is the same as that of the strip material 11 as shown in FIG. The controller 22 detects the lengths of the plate thickness portion and the plate thickness changing portion.
Calculates the correction value from the rolling length and pinch roll 1
Drives 5 and 16 are controlled. That is, the indicated value of the band material feed amount can be calculated by the following mathematical formula 3.

The indicated value of the feed amount of the strip material is X _com , the coefficient of thermal expansion is K1, the program value of the feed amount setting input by the operator is X _prog , the feed amount correction dimension X _c , and the yield offset value. _Xd , the roll radius of the rotary encoder 26 are r, the horizontal length of the roll contact is A, and the vertical length is B, and the rolling process is calculated.

[0029]

[Equation 3]

Therefore, the control unit 22 adjusts the feed amount of the pinch rolls 15 and 16 based on the X- _com instructed value of the feed amount of the strip material calculated in this way. Further, the indicated value of the band material feed amount X _com is controlled in consideration of the measured value of the plate thickness changing portion (inclined portion) of the band material 11 and the yield improving offset value.

That is, in the rolling mill of this embodiment, after the strip 11 is rolled by the rolling rolls 13 and 14, it is cut into a predetermined length by the flying shear 17, and the rolling rolls 13 and 14 are used. After the rolling, the marking device 18 provided adjacent to the marking device 18 stamps marks P ₁ and P ₂ for setting the product length inside the cutting position of the strip 11. In this case, since the strip material 11 is rolled and then cut into a predetermined length, the stamp P on the cut strip material 11 is formed.
_It is possible to improve the yield by minimizing the dead portion of the outer end portions of ₁ and P ₂ . Conventionally, the strip material is cut into a predetermined length before rolling, and this cutting length must consider the amount of extension after rolling depending on the rolling rate, material thickness, etc., and it is necessary to perform experiments, etc. However, in the present embodiment, the fact that it is not necessary also improves the yield.

The strip 1 made of the rolling rolls 13 and 14
In the present embodiment, during the rolling process of No. 1, the actual thickness value t of the strip material 11 before rolling and the roll interval y measured by the gap sensor 21 are input to the control device 22, and the control device 22 uses the following mathematical formulas. 4, the pulling speed V of the strip material 11 by the pinch rolls 15 and 16 is calculated. The instruction value of the rolling speed of the rolling rollers 13 and 15 is V _out .

[0033]

[Equation 4]

Further, in this embodiment, the rolling rolls 13 and 1 are
The control device 22 controls the operation of the roll heater 24 during the rolling process of the strip material 11 according to No. 4. That is, when the strip material 11 is repeatedly rolled, the central portions of the rolling rolls 13 and 14 are heated and thermally expanded to change the thermal crown.
Therefore, at this time, the roll heater 24 mounted on the shaft ends of the rolls 13 and 14 causes the roll 1
3 and 14 are heated, and the temperature is controlled so that the temperature in the direction of the rotation axis becomes uniform.

In the rolling mill of this embodiment, various controls including the drive control described above are performed. That is,
As shown in FIG. 9, the rolling mill control has five mode operations by numerical control and mode operation on the hard disk.
Five modes of operation by numerical control are selected by a rotary switch. These are an external input / output mode, a manual mode, an MDI mode (manual operation), a memory mode, and an editing mode, and the machining operations in the MDI mode and the memory mode correspond to the rolling method described above.

[0036]

As described above in detail with reference to the embodiments, according to the rolling mill of the present invention, the thickness of the rolled strip measured by the strip thickness measuring instrument and the roll distance measuring instrument are measured. Pinch roll drive that controls the drive of the pinch rolls based on the feed amount of the rolling strip measured by the roll roll gap adjusting means and the feed amount measuring device that adjusts the roll gap of the rolling rolls based on the roll gap of the rolling rolls Since it has a control means and a rolling roll temperature control means that operates a heater built into the rolling roll to control the temperature so that the temperature is uniform in the rotation axis direction of the rolling roll, the thickness of the rolling strip is automatically adjusted. The work can be simplified and the work efficiency can be improved by calculating the correction value so that the product thickness falls within the specified range and feeding it back to control the thickness of the next rolling. In addition, by controlling the feed amount of the rolling strip, the yield of the strip can be improved and the waste of material can be eliminated.Furthermore, by controlling the temperature of the rolling roll, partial thermal expansion can be achieved. Can be prevented and the product accuracy can be improved. As a result, high-precision rolling can be continuously performed, and high quality production and high productivity can be achieved.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a rolling method by a rolling mill according to an embodiment of the present invention.

FIG. 2 is an explanatory view showing a rolled state of a strip material.

FIG. 3 is a front view of a rolling roll.

FIG. 4 is a schematic diagram for explaining a Y-axis correction control method.

FIG. 5 is a schematic diagram for explaining an X-axis correction control method.

FIG. 6 is a schematic view showing a rolling process.

FIG. 7 is a schematic view for explaining the yield of rolled material.

FIG. 8 is a system block diagram of the rolling mill according to the present embodiment.

FIG. 9 is a schematic diagram of processing of the rolling mill according to the present embodiment.

FIG. 10 is a schematic view showing a rolling method by a conventional rolling mill.

FIG. 11 is an explanatory diagram showing a rolled state of a strip material by a conventional rolling method.

FIG. 12 is an explanatory diagram showing deformation of a rolling roll due to heat generation.

FIG. 13 is an explanatory diagram showing thermal expansion deformation of a rolling roll.

FIG. 14 is a schematic view showing a conventional rolling process.

FIG. 15 is a schematic diagram for explaining the yield of rolled material by a conventional rolling method.

[Explanation of symbols]

 11 band material 12 leveler 13, 14 rolling roll 15, 16 pinch roller 17 flying shear 18 engraver 21 gap sensor (roll distance measuring device) 22 controller 24 roll heater 25 plate thickness gauge 26 feed amount measuring instrument

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location B21C 51/00 D (72) Inventor Katsuhiko Yanai 5-9 Ohno Roll, Omiya-machi, Naka-gun, Ibaraki Prefecture Mitokita Factory Co., Ltd.

Claims (1)

[Claims] 1. A pair of rolling rolls that holds a strip material for rolling and has an adjustable roll interval, a pinch roll that applies tension to the traveling strip material, and a rolled strip material in a predetermined shape. In a rolling mill having a cutter that cuts to a length, a feed amount measuring device that measures the feed amount of the rolled strip, a plate thickness measuring device that measures the thickness of the rolled strip, and A roll distance measuring device that measures a roll interval of a pair of rolling rolls, a heater built in the pair of rolling rolls, and a pinch roll that controls driving of the pinch roll based on a measurement result of the feed amount measuring device. A drive control unit, a rolling roll gap adjusting unit that adjusts the roll gap of the rolling rolls based on the measurement results of the plate thickness measuring instrument and the roll distance measuring instrument, and the pair of rolling rolls by operating the heater. Rolling mill temperature control means for controlling the temperature so that the temperature becomes uniform in the rotation axis direction of the rolling mill.