JPH05212772A - Method and apparatus for removing warp of sheet - Google Patents

Abstract

PURPOSE:To remove the warp of a sheet by inputting the warp height and total length of the sheet after cutting to an operational processor to determine correction quantity and superposing the correction quantity on the servo amplifier of each of a motors to control the reference peripheral speed of one of rolls. CONSTITUTION:The total length L and heights h1, h2 of a sample of a sheet 4Ab after cutting are manually measured to be inputted to an operational processor 22. The operation a processor 22 operates a warp ratio R from the length L and the heights h1, h2 and multiplies the same by a coefficient (k) to calculate correction quantity DELTAv as DELTAv=K, R. This correction quantity is superposed on one of the servo amplifiers 12, 13 of motors 10, 11 to control the reference peripheral speed v of one of rolls 5a, 5b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet warping method and apparatus, and more particularly to a sheet warp removing method by superposing a correction amount obtained by arithmetically processing a warp height on a servo amplifier. Regarding new improvements.

[0002]

2. Description of the Related Art Conventionally, a sheet forming system shown in FIG. 10 has been adopted as this type of sheet sled removing method and apparatus. That is, FIG.
Reference numeral 1 in 0 denotes an extruder for melt-kneading and extruding the resin raw material 2a supplied from the quantitative feeder 2, and the gear pump 3 and the T die 4 of this extruder 1
The extruded sheet 4A obtained through the lip 4a is sent to the trimming cutter 6 via the first roll 5a and the second roll 5b for forming which are horizontally arranged side by side.

The sheet 4Aa after being formed by the rolls 5a and 5b and passing through the trimming cutter 6 is formed.
Is cut into a predetermined length via the tension detecting roll 7, the take-up machine 8 and the cutting machine 9, and is stored in a stacked state on the stacker 1A as the cut sheet 4Ab.

As another conventional example, as shown in FIG. 15, the motors 10 and 11 are independently provided to the rolls 5a and 5b.
And servo amplifiers 12 and 13 are provided, and each servo amplifier 1
A configuration in which 2 and 13 are controlled by the peripheral speed v _{0 obtained} by adjusting the set value v from the line speed setting device 14 with the ratio device 15 has also been adopted.

[0005]

Since the conventional sheet sled removing method and apparatus are constructed as described above, the following problems exist. That is, as shown in FIGS. 11 to 14, the first roll 5a adjusts the resin supply amount on the front surface A side of the sheet 4A, and the second roll 5b adjusts the resin feed amount on the back surface B side of the sheet 4A. When the peripheral speeds V _A and V _{B of} the respective surfaces A and B are equal, warpage of the seat 4A does not occur, but temperature drift of the amplifier of each motor,
The peripheral speed changes due to the linearity error of the speed detector, the hysteresis effect, and the like, and when the peripheral speed V _A > V _B , the amount of the resin fed in on the surface A side increases, so that the lower warp occurs as shown in FIG. ..

Further, the temperature of each roll 5a, 5b is T ₁ >.
In the case of T ₂ , since the back surface B side is cooled from the front surface A side when exiting the second roll 5b, a contracting force is generated in the entire back surface B, and as shown in FIG. There was a warp in the direction.

Further, in the case of the configuration shown in FIG. 15, although the peripheral speeds of the rolls can be the same, for example, the peripheral speed correction is performed when the peripheral speeds of the rolls are different due to the temperature drift of the servo amplifier. It was impossible.

The present invention has been made to solve the above problems, and in particular, the sheet warp is removed by superimposing a correction amount obtained by calculating the warp height on a servo amplifier. It is an object of the present invention to provide a sheet sled removing method and device.

[0009]

SUMMARY OF THE INVENTION In a sheet sled removing method according to the present invention, a sheet formed through a lip is passed through a first roll and a second roll which are driven by a first motor and a second motor which are independent of each other. In the sheet warping method in which forming and warping are performed by cutting the sheet, the height of the warped sheet after cutting the sheet and the total length of the object to be measured are input to an arithmetic processing unit to obtain a correction amount for each servo of each motor. This is a method of superposing on one of the amplifiers and controlling one reference peripheral speed of each roll to correct the warp of the sheet after cutting.

Further, in the sheet sled removing device according to the present invention, the sheet formed through the lip is formed and sled through the first roll and the second roll which are driven by the first motor and the second motor which are independent of each other. In a seat sled removing device configured to perform removal, a first servo amplifier and a second servo amplifier for operating each of the motors, a line speed setting device for inputting a reference peripheral speed to each of the servo amplifiers, And a processor for outputting a correction amount to be input to any of the servo amplifiers.

More specifically, each of the servo amplifiers is
It is composed of a digital servo amplifier.

[0012]

In the sheet warp up method and apparatus according to the action of the present invention, first, as shown in Figure 7, and measuring the height at which the sheet along by hand, the warp ratio _{R = h 1 + h 2/} 2
L (where L is the total measurement length, h ₁ is the height on one side, and h ₂ is the height on the other side) is determined. By inputting the correction amount ± Δv obtained as a result of calculating this warpage rate by the arithmetic processor into the servo amplifier of the first roll and superimposing it, the reference peripheral speed v ₀ input in advance is v ₀ + Δ By setting v or v ₀ −Δv, the resin supply amount on the front surface side of the sheet can be controlled and the warp of the sheet can be corrected.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of a sheet removing method and apparatus according to the present invention will be described in detail below with reference to the drawings. It should be noted that the same or equivalent portions as those of the conventional example will be described using the same reference numerals. 1 to 9 show a sheet picking apparatus according to the present invention. FIG. 1 is a block diagram, FIG. 2 is an overall configuration diagram, FIG. 3 is a configuration diagram showing essential parts, and FIG. 6 is a characteristic diagram showing such a state, FIG. 5 is a configuration diagram showing a main part, and FIG.
Is a characteristic diagram showing a state in which a force is applied to the sheet, FIG. 7 is a configuration diagram showing a warped state of the sheet, and FIGS. 8 and 9 are characteristic diagrams.

Reference numeral 1 in FIGS. 1 and 2 is an extruder for melt-kneading and extruding the resin raw material 2a supplied from the quantitative feeder 2, and the gear pump 3 and the T-die of the extruder 1 are shown. The extruded sheet 4A obtained via the lip 4a of No. 4 is sent to the trimming cutter 6 via the first roll 5a and the second roll 5b for forming which are horizontally arranged side by side.

The sheet 4Aa after being formed by the rolls 5a and 5b and passing through the trimming cutter 6 is formed.
Is cut into a predetermined length via the tension detecting roll 7, the take-up machine 8 and the cutting machine 9, and is stored in a stacked state on the stacker 1A as the cut sheet 4Ab.

The rolls 5a and 5b are respectively driven by a first motor 10 controlled by a first digital servo type servo amplifier 12 and a second motor 11 controlled by a second digital servo type servo amplifier 13. The servo amplifiers 12 and 13 are independently driven, and the peripheral speed v from the line speed setting device 14 is supplied to the reference peripheral speed v ₀ obtained through a ratio device 15, and the servo amplifiers 12 and 13 are driven. 1
The reference peripheral speed v ₀ supplied to the servo amplifier 12 is input via the adder / subtractor 20.

The adder / subtractor 20 is provided in the control unit 21 connected to each of the servo amplifiers 12 and 13,
The control unit 21 has an arithmetic processing unit 22 for inputting the sled heights h ₁ and h ₂ and the total length L of the object to be measured and outputting a correction amount ± Δv. The sled heights h ₁ and h ₂ and the total length L of the object to be measured are obtained by manually measuring the sheet 4Ab after cutting as shown in FIG.
The warp rate R of Ab is calculated by R = h ₁ + h ₂ / 2L.

Next, the control for actually removing the warp of the seat in the above-mentioned configuration will be described. First, of the warp generation of the sheet 4Ab after cutting, the purpose is to remove the warp generated in the longitudinal direction (the warp in the width direction is not a target). 2 and 4 show a pair of rolls 5a and 5b.
4 shows the behavior of the sheet 4A pressed by. When the peripheral speeds v ₁ and v ₂ of the rolls 5a and 5b are equal, a uniform feeding force F is applied to the sheet cross section of the pressure contact portion 30 of the rolls 5a and 5b. Peripheral speed v ₁ of each roll 5a, 5b
And v ₂ are greatly different, the sheet 4A will be broken or slackened, but if the peripheral speed difference is small, one of the rolls 5a and 5b exerts a pushing force to slide on the contact surface. become. This force keeps kicking out the resin on the surface of the sheet, so that the force F to the cross section of the pressure contact portion 30 is distorted.

That is, FIG. 4 shows a case where the peripheral speed is v ₁ > v ₂ , but in this case, ΔF is present on the front surface A side of the sheet 4A as compared with the back surface B side of the sheet 4A. Since the feeding force is superimposed, ΔF is f ₁ > f _{2 with} respect to the sheet cross section.
> F ₃ ...> f _n as a component force having an inclination. Therefore, by continuously applying these forces, the amount of resin fed to the surface A side increases, and v ₁
As in the case of> v ₂ , a forced correction is made in the direction of the lower sled.

5 and 6 show the case where the peripheral speed is v ₁ <v ₂ . Therefore, in the present embodiment, the case where the amount of resin supplied to the surface A side is adjusted as described above will be described.

Next, in the case of actual control (sledding), based on the sample of the sheet 4Ab after cutting shown in FIG.
The above-mentioned total length L of the object to be measured and the warp heights h ₁ and h ₂ which are the floating amounts at both end positions are obtained manually, and the above-mentioned warp rate R is obtained by the arithmetic processor 22. In the arithmetic processing unit 22, the correction amount Δv is obtained by Δv = K · R (where R is the warpage rate and K is a coefficient). This coefficient K is K = f (τ) · f
(T _P ) · f (T _K ) · f (P) (where f (τ) is the resin viscosity function, f (T _P ) is the resin temperature function, and f (T _K )) is the sheet thickness function, f (P) is a roll contact pressure force function, and f (T
_It is assumed that _P ) is constantly managed by the temperature control unit 40 of FIG. 2, and the functions actually used are f ( _TK ) and f (P).
Is).

Therefore, the correction amount Δv = f (T _K ) R and the function f (T _K ) is a constant parameter. Therefore, as shown in FIG. It has been found that the amount of resin is also required.

Further, the pressure contact force function f (P) between the rolls described above is used.
Is also the same, and since Δv = f (P) · R,
As shown in FIG. 9, it has been found that the stronger the pressure contact force between the rolls 5a and 5b is, the more the corrected feed resin amount is required. That is, if this pressure contact force is too weak, the resin wicking force is reduced, and conversely, if it is too strong, the gradient of the feed force between the front surface A and the back surface B of the sheet 4A becomes small, and the difference between the two surfaces A and B becomes small. Since it will not be possible, the upper and lower limit constraints shown in FIG. 9 are required.

Therefore, by superposing the above-mentioned correction amount ± Δv on the first servo amplifier 12 of the first roll 5a, the reference peripheral speed v _{0 is set} to v ₀ + Δv or v ₀ -Δv. Adjust the amount of resin fed to the surface A side of sheet 4A,
Correcting the warpage and taking the sheet after cutting without warpage 4A
b can be obtained.

In the above embodiment, the case where the surface A of the sheet 4A is controlled has been described, but the second roll 5b
It is also possible to control the back surface B by controlling the peripheral speed of.

[0026]

Since the sheet sled removing method and apparatus according to the present invention are configured as described above, the following effects can be obtained. That is, of the molding rolls, the peripheral speed of one roll is controlled to control the amount of resin fed, so that the warpage that occurs on the sheet surface can be easily and reliably taken, and the quality is improved by improving the yield. Can be easily achieved.

[Brief description of drawings]

FIG. 1 is a block diagram showing a sheet sled removing device according to the present invention.

FIG. 2 is a configuration diagram showing an overall configuration.

FIG. 3 is a configuration diagram showing a control principle.

FIG. 4 is a characteristic diagram showing a state of force applied to a seat.

FIG. 5 is a configuration diagram showing a control principle.

FIG. 6 is a characteristic diagram showing a state of force applied to a sheet.

FIG. 7 is a configuration diagram showing a warped state of the sheet after cutting.

FIG. 8 is a characteristic diagram showing the relationship between sheet thickness and warpage rate.

FIG. 9 is a characteristic diagram showing the relationship between the warpage rate and the pressure contact force.

FIG. 10 is a configuration diagram showing a conventional sheet forming apparatus.

FIG. 11 is a configuration diagram showing a roll of a main part.

FIG. 12 is a configuration diagram showing a seat.

FIG. 13 is a configuration diagram showing a bent sheet.

FIG. 14 is a configuration diagram showing a bent sheet.

FIG. 15 is a configuration diagram showing the other side of a conventional sheet sled removing device.

[Explanation of symbols]

4a lip 4A sheet 4Ab sheet after cutting 5a first roll 5b second roll v ₀ reference peripheral speed Δv correction amount A front surface B back surface 10 first motor 11 second motor 12, 13 servo amplifier

Claims (3)

[Claims] 1. A sheet (4A) formed through a lip (4a).
A first motor (10) and a second motor (11) which are independent of each other.
First roll (5a) and second roll (5b) driven by
In the method for removing a sheet by performing the shaping and the sleding through the sheet, the height (h ₁ , h ₂ ) of the cut sheet (4Ab) after cutting the sheet (4A) and the total length of the measured object (L ) Is input to the arithmetic processor (22) and the correction amount (Δv) is input to each motor (1
0, 11) on each one of the servo amplifiers (12, 13) to control one reference peripheral speed (v ₀ ) of each roll (5a, 5b) to control the cut sheet (4Ab). A sheet sled removing method characterized by correcting the sled. 2. A sheet (4A) formed through a lip (4a).
A first motor (10) and a second motor (11) which are independent of each other.
First roll (5a) and second roll (5b) driven by
In a sheet chamfering device for forming and chamfering via a first servo amplifier (12) and a second servo amplifier (13) for operating each of the motors (10, 11)
And the line speed setting device (14) for inputting the reference peripheral speed (v ₀ ) to each of the servo amplifiers (12, 13), and the correction amount input to any of the servo amplifiers (12, 13). A sheet sled removing device comprising an arithmetic processing unit (22) for outputting (Δv). 3. The seat chamfering apparatus according to claim 3, wherein each of the servo amplifiers (12, 13) comprises a digital servo amplifier.