JPS60225730A - Adjustment of cap clearance - Google Patents

Abstract

PURPOSE:To correct the cap clearance to give a specified sheet thickness by a method wherein the actual sheet thickness is inspected to determine whether it meets the specified value and a computation is made considering mutual interference effect to automatically operate a control bolt for adjusting the cap based on the results when it does not. CONSTITUTION:The constant FIj is a proportional constant matrix peculiar to each die, which can be determined experimentally or theoretically and memorized into a memory 28 beforehand. Target sheet thickness t1 at a plurality of points is set on a setter 26. If so, a comparator 27 compares the thickness t1 with the value measured with a thickness measuring device 25 to calculate the value of the cap clearance for changing with control bolts from the deviation (mI-tI) and the resulting value is represented by eI. This calculation can determine the amount deltaI of bolt control, which is led to a display 30 using a CRT with an arithmetic unit 29. A feedback is also made for a control bolt driving section of a heat bolt, servomotor or the like utilizing a thermal displacement through a power control unit 32 to ensure the specified cap clearance.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for adjusting a gap between a mouthpiece and a sheet or film made of thermoplastic resin, cellulose, rubber, etc., a magnetic material coater, paper, a cellophane hopper, and other materials for discharge molding printing ink, etc.

This is a cap for forming this kind of sheet or film (hereinafter referred to as notebook etc.).As shown in Figs. 12 to change the pressing force acting on the back surface 13a of the movable cap J3.
This is done by adjusting the bend in the neck portion 14 of the. However, the cap 13 is continuous in the width direction, and as shown in FIG. 1, when a particular bolt f out of the plurality of operation bolts is operated, only the cap gap at the position where that bolt acts changes. It has been found that other parts of the body are affected as well. This phenomenon is called mutual interference effect.

For example, as shown in Figure 3, among the 22 operating bolts,
When the 8th and 15th bolts f are operated alone, deformation patterns of the movable base as shown in graphs a and b are obtained. Next, when both bolts are operated at the same time, if the condition that all the bolts are in contact with the back surface of the mating movable cap is established, a composite pattern of a and b'ff- superimposed in the direction of C will be measured. be done.

When actually making adjustments, first calculate the butterfly corresponding to C as the target number of changes in the mouthpiece gap from the measurement data of the thickness gauge.
An action is given and an operation is performed to achieve this. However, since the pattern C is generally quite complex and changes each time, it is very difficult to realize this through intuitive and experiential operations.

Currently, most of the adjustment of the cap gap is done manually based on the experience and feeling of the operator, so there are individual differences.
Not only is the accuracy of adjusting the gap between the caps limited, but the adjustment work is time-consuming and the work is dangerous.

Although some attempts have been made to streamline and automate this adjustment, there is still room for improvement in terms of control accuracy, speed, etc. For example, Special Public Interest Publication No. 53-794 i1
No., Special Publication No. 58-39050, Special Publication No. 5R-3964
Publication No. 9 etc. have the same purpose as the present invention,
Although each method is effective and has practical value, it is difficult to say that it is fully developed in that it attempts to determine the amount of bolt operation in an approximate manner.

The exact deformation characteristics of the movable cap are determined by Hooke's law (elastic ring)
It can be determined by applying the equilibrium equation based on the compatibility condition ff. \As a result, according to VC, the internal shape of the movable cap is quite complicated due to the operation of a single bolt, and even in the experimental results using a prototype model with 10 bolts, the peak changes as shown in Figure 5. As can be understood from the graph showing the rate of change of each bolt position when the bolt position is set to 1.0, the deformation pattern varies considerably depending on the bolt position, and in particular, the closer you get to both 4-part positions, the larger the absolute value becomes. This has been proven. In particular, it has become clear that the amount of deformation per unit operation amount, that is, the proportional constant to the bolt operation amount, becomes thicker at both ends, which are most important for controlling the shape of the thickness, and that the left-right symmetry breaks down. Ru.

Therefore, in order to improve control accuracy, it is most desirable to convert these deformation characteristics into 15 numbers, calculate and use them.

The present invention is based on this idea, and the applicant has previously applied for Japanese Patent Application Laid-Open No. 1978-78726, in which the amount of change in bolt load is an unknown quantity based on the characteristic matrix of load and displacement. We have applied for a method to calculate the amount of operation by solving simultaneous equations, but by understanding the simultaneous equations in which the amount of bolt operation is an unknown quantity based on the characteristic matrix of bolt operation amount and displacement due to the die structure etc., we can directly calculate the bolt operation. There is also a need for a method to do so, which led to the present invention.

Next, to explain the method of the present invention, the entire thickness of the sheet during molding in the middle direction is measured, and it is inspected to see if the sheet thickness is a predetermined thickness, and if it is not the predetermined value, is a method for adjusting the cap gap in which the operation bolt f for cap adjustment is automatically operated based on the result of calculation 7 while taking into account the mutual interference effect described above, and the cap gap is corrected to a predetermined sheet thickness. It is all about providing.

Next, one embodiment of the present invention will be explained with reference to FIG.
is a die attached to an extruder (not shown), and as explained in the conventional example above, there are operating poles attached at multiple locations in the width direction)
? Push and pull to adjust the gap between the caps. 2
A running sheet 2 passes through a cooling roller 23, passes through a treatment process 24'f that performs stretching, etc., and is wound up by a winding device, etc. (not shown). Reference numeral 25 denotes a thickness measuring device that continuously measures the thickness of the sheet 22 while it is running in the width direction. Reference numeral 26 denotes a target sheet thickness setting device that sets the sheet thickness at a plurality of predetermined locations in the width direction of the die 21. A comparator 27 compares the note thickness value detected by the thickness measuring device 25 with the value set in the target sheet thickness setting device 26, and determines the amount of the mouthpiece gap to be changed by V based on the deviation. 2Flj: a storage device for setting a proportional constant between the displacement amount of the cap gaps at the plurality of predetermined locations and the operation amount of the plurality of cap gap adjustment operation bolts provided corresponding to the predetermined locations of the cap, respectively; be.

Reference numeral 29 denotes an arithmetic device that calculates the operation Mff of each bolt at the plurality of predetermined locations from the amount of change in the cap gap received from the comparator 27 and a proportionality constant set in the storage device.

30 is a display device such as a cathode ray tube, and the arithmetic unit 29
The operation amount for each operation bolt calculated by the operation amount is displayed separately for each port as an operating guide. Not only can it be displayed on a broken cathode ray tube, but it can also be printed out by leading it to the printer section 31. 3
2 is a power control unit, which includes the arithmetic unit 29;
The calculated result is sent as an operation signal to a drive unit that controls the amount of operation of the operation bolt.

The configuration is as described above, and its operation will be explained next.

Now, by assuming that the target system is in a certain dynamic equilibrium state, analysis of the valley variables involved in control can be performed in layers by only the transient minute changes from this equilibrium state. . , (perturbation method).

There is no contradiction in applying such a convenient approach to the system according to the invention. Therefore, the following explanation will be based on the perturbation method.

In Fig. 1, when only the fifth bolt 5 out of ten operating bolts is operated, the deformation of the cap is εl at each predetermined position.
, ε2・・・・・・・・・εlO changes, then an extension of Hooke's law, b, becomes εI=
F15·δs (1) holds true. However, in formula (1), F+s is a proportional constant of the mouthpiece gap at the ■th position with respect to the fifth bolt operation amount.

Generally, the amount of change εi in the displacement of the movable cap is εl=p'lJ+δJ (J=1.2.3 ・=-
=-...n)-(21.

Next, the control process of the present invention will be explained according to the flowchart of FIG. 6. The constant FIJ is a proportional constant matrix specific to each die, and ii! As shown in FIG. 5, it can be determined experimentally or theoretically, so it is stored in the storage device 28 in advance.

In addition, if the target sheet thickness [I] at a plurality of predetermined locations is set in the setting device 26, the comparator 27 compares all the values with the values measured by the thickness measuring device 25, and the deviation (m
z-1t), calculate the amount of the cap gap to be changed by each operating bolt, and calculate the area ex(I = 1.2...
...n). If each bolt operation amount to obtain each value eI is δJ (J=1.2...n), then the proportionality constant F! stored in the storage device 28VC! , zK so el ==Σ kllJ・δJ (I = 1.2,3
------------=-n) --(3) J=1. That is, for δJ Vc, the above-mentioned multi-dimensional simultaneous equation can be solved.

As is clear from the above equation, the bolt operation amount δ■ determined by the present invention has no ambiguity, and therefore very good control results can be obtained.

As explained above, the bolt operation amount δ1 is determined n
The arithmetic unit 29 can lead to a display device 30 using a cathode ray tube or a printer 4131. In addition, the power control unit 32 can be used to feed the operating bolt drive unit such as a heat bolt type or servo motor type that uses thermal displacement to create a predetermined gap between the caps, eliminating the drawbacks listed at the beginning. It will be destroyed.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing a conventional die, Fig. 2 is a view taken along the Z arrow in Fig. 1, Fig. 3 is a graph explaining the relationship between the operating bolt and the displacement of the movable base, and Fig. 4 is a diagram of the die according to the present invention. A diagram showing a first embodiment,
FIG. 5 is an explanatory diagram illustrating how the deformation of the entire cap is affected by the operation of a single bolt. Figure 6 is a flowchart showing the control process according to the adjustment method of the present invention. 25...Thickness measuring device 26...Target thickness setting device 27...Comparator 28...Storage device 29...Arithmetic device 30...H display W 32...Power control unit No. 1 Kasumi 3rd Sekivolt Number 405 5th [. Etc. 41 yen 1

Claims (1)

[Claims] Measure the thickness of the film, etc. being formed in the width direction, compare it with the sheet thickness in the width direction set as a target in advance at a predetermined point of the value, and determine the target amount of change in the mouth gap to be changed from the deviation, A proportional foot loading matrix equation between the displacement amount of the movable cap at the predetermined location and the amount of operation of a plurality of operation bolts for adjusting the cap gap provided at the corresponding position; 1. A method for adjusting a gap between caps, comprising: calculating an amount of operation, and operating each of the operation bolts based on the calculated amount.