JPS5926369B2 - Method for manufacturing plate material with thickness change in longitudinal direction - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a plate material having a thickness change in the longitudinal direction.

A plate whose thickness is constant and whose thickness gradually changes in the longitudinal direction is
It is used in general structural members that are subjected to bending moments that gradually change in the longitudinal direction, and is expected to have many favorable effects such as weight reduction, material saving, and structural simplification. If it were easily available, the demand for it would be enormous.

For this purpose, the applicant has filed a patent application No. 53-90805.
No. 1, the present invention provides a method and an apparatus for manufacturing a plate material having a desired shape with a constant width and a thickness varying in the longitudinal direction using a width direction roll and a thickness direction roll through a trimming process. However, it is an object of the present invention to improve this method and provide a method that can produce highly accurate products using equipment as inexpensive as possible.

In other words, the present invention uses a width roll and a thickness roll, and after reducing the width of the workpiece in advance with the width roll so that the width of the product is constant over the entire length during rolling with the thickness roll. , relates to a method for manufacturing a plate material whose thickness is constant and whose thickness changes in the longitudinal direction by changing the thickness of the workpiece material with a thickness roll based on predetermined conditions, the summary thereof The Iiyama of the workpiece is reduced using the upstream width roll to produce the Iiyama deformed material, and then the Iiyama deformed material is rolled in the thickness direction using the downstream thickness roll. A method for producing a variable thickness material having a constant thickness and a desired change in thickness in the longitudinal direction, prior to the start of a rolling operation.

At least (a) a step of determining a thickness direction function indicating the relationship between the longitudinal position and the plate thickness of the variable thickness material to be manufactured;
(b) When controlling the thickness roll according to the thickness direction function, the thickness direction (c) determining the width of the product when the workpiece is rolled with a thickness roll; (d) determining a width direction function representing the longitudinal position and amount by which the width of the workpiece should be reduced in advance with the width roll; and (d) corrected thickness direction function and width. after the start of rolling, at least (e) detecting the longitudinal movement amount of the Iiyama deformable material on the exit side of the width roll; ) A step of determining the roll gap of the width roll from time to time based on the longitudinal movement amount of the Iiyama deformable material and the width direction function, and controlling the roll gap of the width roll based on the determined value; a step of detecting the amount of longitudinal movement of the material with variable thickness on the exit side of the thickness roll; The process involves determining the roll gap between the rolls and controlling the roll gap between the thickness rolls based on the determined value.

An embodiment of the present invention will be described in detail below with reference to the drawings.

What is shown in Figure 1 is a line of product shapes to be manufactured, consisting of five sections separated by points a, b, c, d, e, and f, each with a straight line (generally is a constant long material whose shape is periodically repeated symmetrically with respect to the X axis, which is a curved line.

In FIG. 2, reference numeral 1 denotes a workpiece, which is continuously moved in the direction indicated by arrow A.

On the upstream side of the flow of the workpiece 1, a medium rolling mill 2 equipped with a pair of width rolls (hereinafter simply referred to as width rolls) 2a and 2b is disposed.

The width rolls 2a and 2b are supported by a frame (not shown) so that the roll position can be changed and adjusted, and are rotated by a drive device (also not shown).

The roll position is changed and adjusted by a width roll lowering device 4 including hydraulic cylinders 3a and 3b.

Further, downstream of the width rolls 2a, 2b, a thickness rolling mill 5 equipped with a pair of thickness direction rolling rolls (hereinafter simply referred to as "thickness rolls") 5a, 5b is disposed, and similarly to the medium rolling mill 2, a thickness rolling mill 5 is provided. It is supported and rotated by a frame, drive device, etc. (not shown) so that the roll position can be changed and adjusted.

The roll position is then changed and adjusted by a thickness roll lowering device 7 including hydraulic cylinders 6a, 6b.

Now, the control device for the medium rolling mill 2 will be explained.

The amount of movement of the workpiece 1 is determined by a first detection roller 9 that is brought into contact with the workpiece 1 and rotates as the workpiece moves, and an encoder 11 that generates a pulse at each constant rotation angle.
It is detected by the movement amount detector 12, and the width control calculator 8
input to a.

The width control calculator 8a calculates a target roll position corresponding to each longitudinal position of the workpiece 1 from this input and a preset width direction function (described in detail later) 53, and outputs the result. .

The digital output of the width control computer 8a is provided by a D/A converter (
Digital-analog converter) 13 a.

13b, the signal is converted into an analog signal and input to servo amplifiers 14a and 14b.

The outputs of differential transformers 15 and 16 are also input to the servo amplifiers 14a and 14b, respectively (these two differential transformers 15 and 16 constitute a low stage position measuring device 17). input and said D/
An output having a magnitude corresponding to the difference between the input from the A converters 13a and 13b is output to the servo valves 18 and 19.

As a result, the servo valves 18, 19 are activated, pressure oil from the hydraulic unit 21 is supplied to the hydraulic cylinders 3a, 3b, and the positions of the width rolls 2a, 2b are varied.

As a result of this positional variation, when the input from the differential transformers 15 and 16 matches the input from the D/A converters 13a and 13b, the servo pulps 18 and 19 are brought to a standstill.
The positions of the middle rolls 2a and 2b are changed and adjusted to the values instructed by the middle control computer 8a.

That is, the roll position measuring device 17. Servo amplifier 14a
, 14b, Servopulp 1B.

Reference numeral 19 indicates a width control servo mechanism 22 that controls the operation of the width roll reduction device 4 based on the output of the width control computer 8a.
It constitutes.

The above description has been about the control device of the medium rolling mill 2, but the control device of the thickness rolling mill 5 is also almost the same, and the second movement amount detector 28 consisting of the detection row 226 and the encoder 27 is used to detect the workpiece 1. The amount of movement is detected, and the thickness control calculator 8b calculates the target roll position based on the detection result of this movement amount and the corrected thickness direction function 54 (described in detail later) set in the thickness control calculator 8bVc. The results are converted into analog signals by D/A converters 29a and 29b.

Based on this analog signal, the differential transformer 31.32
A roll position measuring device 33 and a servo amplifier 34a equipped with
.

34b, servo pulp 35, 36, etc., the thickness control servo mechanism 37 controls the thickness roll reduction device 7 including the cylinders 6a, s6b, and lowers the thickness rolls 5a, 5.
The roll position b is controlled in accordance with the instructions from the thickness control calculator 8b.

Next, the width control calculator 8a and the thickness control calculator 8b
and the preprocessing computer connected thereto will be explained in more detail based on FIG.

In the figure, reference numeral 50 denotes a preprocessing calculator, into which a desired product shape 51 is input, and rolling conditions 52 such as workpiece material, rolling temperature, rolling speed, roll diameter, etc. are input.

and a thickness roll 5a. 5b, the width roll 2a is rolled so that the width of the product is constant when the material 1 is rolled by the width roll 2a.
, 2b, the preprocessing calculator 50 calculates a width direction function 53 representing the longitudinal position and amount by which the width of the workpiece 1 should be reduced in advance.

Furthermore, the preprocessing calculator 50 calculates the roll diameter and the shape of the product that will actually be obtained when the axis of the thickness roll is controlled according to the thickness direction function in the thickness direction function representing the product board thickness shape. A corrected thickness direction function 54 is calculated by predicting and correcting the amount of deviation from the desired product shape due to the influence of the roll deflection amount.

Regarding this modification, since this equipment is a device that hot-processes high-temperature materials, the thermal expansion of the rolls is large, and the amount of roll reduction is changed from moment to moment, and the amount of roll deflection increases or decreases depending on the amount of reduction. Both of them were selected as the main modification conditions that affect the product shape.

Regarding the width direction function 53 and the modified thickness direction function 54, as shown in FIG. 1, the product consists of five sections: two parallel sections at the center and both ends, and two tapered sections connecting them If the width direction function 53 and the modified thickness direction function 54 are
They will be expressed in different forms accordingly.

To be more precise, the product shape can be divided into five sections, but the width direction function 53 etc. are not always displayed in five sections. For example, the boundary between each section is If it is desirable to display a function different from any other interval, ε will be displayed in more than one interval, but here, for ease of understanding, the width direction function 53 is The following description assumes that the product shape 51 is displayed in five sections.

In addition, the width direction function 53, etc. is assumed to take the starting point of each section as the origin of the horizontal axis, and is expressed by the coordinates of the horizontal axis corresponding to each origin and a formula specific to each section, and corresponds to the five sections mentioned above. It is assumed that the width direction function 53 and the modified thickness direction function 54 for one control cycle are constructed by the coordinates and the formula.

The width direction function 53 and the modified thickness direction function 54 calculated as described above are input to the width control calculator 8a and the thickness control calculator 8b, respectively.

A width control calculator 8a and a thickness control calculator 8b are shown here.
are counters 55 and 56, comparator 56, and
66, calculation counters 57, 67, controller 58.
68, arithmetic units 59, 69, adders 60, 70, etc.

First, the width control computer 8a will be explained in detail.

The counter 55 controls the first
The pulses sent from the movement amount detector 12 are counted.

The comparator 56 uses the count result and the width direction function 53.
From this, it is determined which section of the five sections of the product shape 51 the workpiece 1 is currently in, and the result is output to the controller 58.

The controller 58 sends a reset signal to the arithmetic counter 57 at each start time of each section, selects a function corresponding to that section, and instructs the arithmetic unit 59 to perform the calculation.

The calculator 59 calculates the amount of change in the roll position per unit horizontal axis length based on the selected function and the pulse calculation results for each section by the calculation counter 57, and calculates the amount of change in the roll position per unit horizontal axis length.
Enter 0.

The adder 60 adds this to calculate the function value, that is, the width roll position, and converts this into the D/A converter 13a shown in FIG.
, 13b.

As a result, as described above, the width roll lowering device 4 is operated by the width control servo mechanism 22 including the servo amplifiers 14a, 14b and the servo valves 18, 19, etc., and the roll position of the width rolls 2a, 2b is controlled. It is.

Next is the thickness control calculator 8b, which is almost the same as the width control calculator 8a described above.

First, the counter 65 counts pulses sent from the second movement amount detector 28 according to the amount of movement of the workpiece 1.

The comparator 66 determines which section of the five sections of the product shape the workpiece 1 is currently in from the count result and the corrected thickness direction function, and outputs the result to the controller 68.

The controller 68 sends a reset signal to the arithmetic counter 67 at each start time of each section, selects a function corresponding to that section, and instructs the arithmetic unit 69 to perform the calculation.

The calculator 69 calculates the amount of change in the roll gap per unit horizontal axis length based on the selected function and the pulse counting results for each section by the calculation counter 67, and inputs the calculated amount to the adder 70. do.

The adder 70 adds these values to calculate the position of the thickness roll, which is then transferred to the D/A converter 29a shown in FIG.

29b.

As a result, as described above, the thickness control servo mechanism 37 operates the thickness roll lowering device 7 to control the roll positions of the thickness rolls 5a and 5b.

Next, the operation of rolling a plate material whose thickness changes in the longitudinal direction with the Iiyama force μ constant using the apparatus configured as described above will be explained.

First, from the shape of the product to be manufactured, a thickness direction function representing the relationship between the longitudinal position and the plate thickness was determined, and using this thickness direction function, the workpiece 1 was rolled by the thickness rolling machine 5. The preprocessing computer 50 calculates the width direction function 53 necessary to correct the amount by which the width of the product would increase in the case of the product and make the width of the product the same at all positions in the longitudinal direction.

At this time, the material of the workpiece, rolling temperature, rolling speed, roll diameter, etc. are used as rolling conditions.

Next, the above-mentioned rolling conditions are input into the pre-processing calculator 50 together with the above-mentioned thickness direction function, and the product actually obtained when the axes of the thickness rolls 5a and 5b are controlled according to the above-mentioned thickness direction function. The amount by which the shape of the product will deviate from the given product shape is calculated, and the corrected thickness direction function 54 is calculated.

At this time, the effects of roll diameter, roll deflection, etc. are used as correction conditions.

In the above manner, the width direction function 53 and the corrected thickness direction function 54 obtained in advance are respectively input to the width control calculator 8a.
By inputting the information into the thickness control calculator 8b, preparation for rolling is completed.

When the preparation for rolling is completed, the workpiece 1 is transferred to the width roll 2a.
Let j2b bite.

When the first movement amount detector 12 comes into contact with the workpiece 1, pulses begin to be generated, and these pulses are input to the width control computer 8a.

The width control calculator 8a calculates the target roll gap of the middle roll every moment as the workpiece 1 moves, based on the output from the width direction function 53 and the pulse from the first movement amount detector 12. It is output to the width control servo mechanism 22.

The width control servo mechanism 22 controls the width roll 2aj2 according to the command.
b are brought closer and separated periodically, and as a result, an intermediate material whose plate thickness is varied in the longitudinal direction is obtained.

Next, when the tip of the intermediate material is bitten by the thickness rolls 5a and 5b and the second movement amount detector 28 comes into contact with the intermediate material, pulse generation is started, and this pulse is input to the thickness control calculator 8bVc. be done.

This thickness control calculator 8b controls the thickness of the roll every moment as the workpiece 1 moves, based on the set corrected thickness direction function 54 and the pulses from the second movement detector 28. The roll gap is calculated and output to the thickness control servo mechanism 37.

The thickness control servo mechanism 37 controls the thickness roll 5a according to the command.
, 5b are controlled, and as a result, a product with a constant Iiyama and a plate thickness that changes periodically in the longitudinal direction can be obtained.

What should be noted here is that the pulse signal indicating the amount of movement of the workpiece 1 from the first movement amount detector 12 is input to the counter 65 in the thickness control calculator 8b, and the counter 65 on the workpiece 1 is 65 and the counter 55 for each control cycle.

That is, after the pulse signal is emitted from the first movement amount detector 12 and the counter 55 starts operating, the detection result of the movement amount by the first movement amount detector 12 is displayed as the width roll 2a.
, 2b and the distance between the thickness rolls 5a and 5b (distance between axes)
, the counter 65 detects the second movement amount detector 2.
The counting of pulse signals from 8 is started.

By doing this, when the width rolls 2a, 2b and the thickness rolls 5a, 5b are controlled independently, the Iiyama change on the workpiece 1 due to the accumulation of dimensional errors in the longitudinal direction of the workpiece 1 can be controlled independently. This makes it possible to completely prevent the starting point of the plate thickness change and the starting point of the plate thickness change from shifting each time the adjustment cycle is repeated, resulting in uneven Iiyama.

Additionally, although this embodiment shows an example in which the width control calculator 8a and the thickness control calculator 8b are provided separately, it is also possible for one calculator to serve as a dual-hand calculator. It is.

In addition, the preprocessing calculator 5 calculates a modified thickness direction function 54 that is obtained by modifying the thickness direction function according to the influence of the roll diameter and the amount of roll deflection.
Although the width direction function 53 is calculated using 0, it is also possible to calculate a modified width direction function by modifying the width direction function 53 under similar conditions.

Further, the width direction function 53 and the modified thickness direction function 54 may be displayed with the same point as the origin in all sections.

Further, in this embodiment, two differential transformers 15.
16 and 31.32, a roll position measuring device 17.33 was used to measure each roll position from the reference line, but it is also possible to measure the roll gap without considering the reference line and control only the roll gap. It is.

In this case, only one differential transformer or the like is required to be measured.

In addition, the roll lowering device may not be based on a hydraulic cylinder as described above, but may have a structure in which the gap adjustment screw is rotated by an electro-hydraulic pulse motor or the like, thereby changing the roll gap. In that case, a servo mechanism may be used. It is necessary to adapt it accordingly.

Further, as the movement amount detector, it is also possible to use a non-contact type using an image sensor or the like.

As is clear from the above description, the present invention predicts the amount by which the Iiyama will change when the thickness of the plate is changed by the thickness roll when producing a material with variable thickness that has a constant Iiyama. Therefore, not only should rolling in the width direction be performed prior to rolling in the thickness direction to counteract this, but also the amount of deflection of the thickness roll changes as the amount of reduction changes from moment to moment during the rolling operation. In order to prevent the dimensional accuracy of the plate material with variable thickness, which is a product, from decreasing due to this, a modified thickness direction function is calculated by adding corrections to the thickness direction function representing the product shape prior to the start of rolling work, and the actual Since the thickness roll is controlled according to this modified thickness direction function, it is possible to manufacture plate thickness variable material with high dimensional accuracy using inexpensive equipment. .

When rolling a material with variable thickness, it is extremely important to avoid large changes in the amount of roll deflection and to eliminate product dimensional errors caused by this. If this is achieved by modifying the dimensions of the product, as is usually done, the dimensions of the thickness roll's reduction blade or the actual product are measured, and the results are fed back to the control device to ensure precision. Compared to the case where dimensional accuracy is kept within a desired range, a plurality of measuring devices and control devices are unnecessary, and equipment costs can be reduced.

In addition, since the corrected thickness direction function is determined prior to the start of the rolling operation, it can be determined using a separate calculator from the rolling mill control calculator, and a small-capacity calculator may be used as the rolling mill control calculator. Therefore, one of the effects of the present invention is that equipment costs can be further reduced.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an example of the shape of a product manufactured by the apparatus according to the present invention. FIG. 2 is an explanatory diagram showing an embodiment of the apparatus of the present invention using both a perspective view and a block diagram, and FIG. 3 is a block diagram showing details of the main parts thereof. 1: Material to be cut, 2: Medium rolling mill, 2a, 2b: Width roll, 3a, 3b: Hydraulic cylinder, 4: Width roll rolling device, 5: Thickness rolling machine, 5 a, 5 b: Thickness roll,
6a, 6b: Hydraulic cylinder, 7: Thickness roll reduction device, 8a: Width control calculator, 8b: Thickness control calculator, 12: First movement amount detector, 13aj13b,
29aj29b: D/A converter, 14a, 14b,
34a, 34b: Servo amplifier, 17.33: Roll position measuring device, 18, 19° 35.36: Servo valve, 21: Hydraulic unit, 22: Width control servo mechanism, 2
8: second movement amount detector, 37: thickness control servo mechanism,
50: Preprocessing calculator, 51: Product shape, 52: Rolling conditions, 53: Width direction function, 54: Modified thickness direction function, 55
．． 65: Counter, 56, 66: Comparator, 57,
67: Arithmetic counter, 58.68: Controller, 5
9.69: Arithmetic unit, 60.70 = Adder.

Claims (1)

[Scope of Claims] 1. The Iiyama of the workpiece is reduced using a width roll on the upstream side to obtain a deformed Iiyama material, and then the Iiyama deformed material is rolled in the thickness direction using a thickness roll on the downstream side. A method for manufacturing a material with variable thickness having a desired change in thickness in the longitudinal direction with the Iiyama force μ constant, comprising: (a) prior to the start of rolling operation, at least (a) the thickness of the material to be manufactured; (b) determining a thickness direction function indicating the relationship between the longitudinal position of the variable material and the plate thickness; In order to eliminate product dimensional errors caused by increases and decreases in the amount of deflection of the thickness roll, the corrected thickness is obtained by adding a correction in which the amount of correction in the plate thickness direction changes in the longitudinal direction of the workpiece to the thickness direction function. (c) The width of the workpiece should be reduced in advance with the width roll so that the width of the product is constant over the entire length when the workpiece is rolled with the thickness roll. (b) after the start of rolling; , at least (e) detecting the longitudinal movement amount of the Iiyama-variable material on the exit side of the width roll, and (f) detecting the movement amount of the Iiyama-variable material in the longitudinal direction from time to time based on the longitudinal movement amount of the Iiyama-variable material and the width direction function. determining the roll gap of the width roll and controlling the roll gap of the width roll based on the determined value; (g) detecting the amount of longitudinal movement of the thickness-variable material on the exit side of the thickness roll; (h) Determining the roll gap between the thickness rolls from time to time based on the longitudinal movement amount of the thickness-changeable material and the corrected thickness direction function, and determining the thickness based on the determined value. 1. A method for manufacturing a plate material having a thickness change in the longitudinal direction, the method comprising: controlling a gap between rolls.