JPS6082220A - Method for controlling stretching rate of stretcher leveler - Google Patents

Abstract

PURPOSE:To control stretching rate to an optimum value by detecting the stress- strain characteristic of a material to be stretched in the stretching process of said material. CONSTITUTION:The output signals X1, X2 of position detectors 1, 2 are added in an adding part 6 and thereafter a tension amt. epsilon' is determined in a divider part 7. Pressure sensors 9, 10 are provided to a hydraulic circuit for driving cylinders 1, 2 and the output signals P1, P2 therefrom are added in an adder part 11. The stress sigma generated in a material 8 to be stretched is determined in an integrating part 12. An arithmetic processing part 12 stores the coefft. E of longitudinal elasticity of the material 8, determines the initial deflection rate epsilonc from epsilon' and sigma within the elastic limit, determines the spring back amt. from sigma, epsilon' exceeding the elastic limit and determines finally the stretching rate epsilon. The stretching rate is determined at the point of said time and therefore the control of the stretching rate is made easy.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a method for controlling the amount of stretch of a stretch yarepe 2.

[Background of the invention]

A stretcher leveler applies tensile stress to an aluminum plate, stretches it, and removes the strain, and it is necessary to apply an appropriate stretch to the aluminum plate. However, the stress-strain characteristics of aluminum plates and the like are not uniform, and furthermore, it is not easy to understand the stress-strain characteristics of the aluminum plate and the like every time it is stretched. For this reason, in the past, stretching was performed while estimating the stress-strain characteristics of an aluminum plate based on standard values, and it was not always possible to obtain an appropriate amount of stretch.

[Purpose of the invention]

The present invention was devised to solve these conventional problems, and an object of the present invention is to provide a stretch amount control method for controlling the stretch itt to the optimum value.

[Summary of the invention]

A method for controlling the amount of stretch of a stretcher leveler according to the present invention is to grasp the stress-strain characteristics of a material to be stretched during the stretching process of wrinkle elongation abrasive by a stretcher leveler.

[Embodiments of the invention]

Next, a first embodiment of the stretch amount control method according to the present invention will be explained based on the drawings. 1. FIG. 1 shows a control device used in this embodiment, and this control device is a stretch leveler. It is provided with a position detector 3.4 for detecting the position of each cylinder 1.2, and a speed detector 5 for detecting the entire speed of the cylinder 1. Output signal X of position UtL detector 1.2
1,
). (xl+x2)/2L determined here is generally called the tensile amount ε'.

The hydraulic circuit for driving the cylinder 1.2 is provided with pressure sensors 9 and 10, and the output signals P1 and P2 of each pressure sensor 9.10 are added in an adding section 11. cylinder 1
．． Effective cross section of 2 ffl'! When rA-1 is the cross-sectional area of the stretched material f Ap, the sum determined by the adding section 11 (P1+
P2) is multiplied by A/Ap in the integrating section 12. (P1+P2)XA/Ap determined here becomes the stress σ generated in the stretched material 8.

The tensile amount ε' and the stress σ are input to the arithmetic processing section 12, and the arithmetic processing section 12 calculates the stretch amount 6 based on ε' and σ.

As shown in FIG. 3, the material to be stretched 8 exceeds its elastic limit and
The initial slack needle total ε of the material to be distracted 8 when strained up to the point. , spring bank wire εE, 6−ε′−(εC+6E) ・・・・・・・・・・・・
(1) Here, the initial slack εC is the value of ε' at the intersection A with the coordinate axis of the strain ε' of the linear stress-strain diagram B-C within the elastic limit. Also, the springback amount εg corresponds to the distance between the intersection point F of a straight line drawn parallel to the straight line B-C from the point and the coordinate axis of strain ε', and the foot D' of the perpendicular line drawn from the point to this coordinate axis. is the strain value.

The arithmetic processing unit 12 stores the longitudinal elastic modulus Ek of the stretched material 8, calculates the initial slack amount εC from every 6' jump within the elastic limit, and calculates ε', for example, σ at point D, every time the elastic limit is exceeded. ,
Calculate the total billing amount from ε′.

Arithmetic processing section 12'' (The block diagram is as shown in Fig. 2, and the acid crab processing section 12 is equipped with a storage section 13.14 that stores all 0 points within the elastic limit, and a storage section 3.14. teeth,
σ and ε' are inputted through switches 15 and 16. The switches 15 and 6 are driven by a comparator 17, and the comparator 17 has σ set in advance.

Close switch 5.16 when equal to 0.

σeo is the stress value σ that is definitely included within the elastic limit, and σ and ε′ at this time are stored as σ and 116 in the storage unit 13.14.

σC is subtracted from σ in the subtraction section 18, and the value determined here (σ-σC) is calculated by the quantity surveying section 9ts knee.
Multiplied by c1/m. This (σ-σc)/E is subtracted from ε' in the subtractor 20 to obtain ε'-(σ-σ
c) / E is obtained, and ε'C is further subtracted from this value in the subtraction n part 2o, giving ε'-(σ-σc)/E g'(=ε'-(ε
'C-σc/E)-σ/E-ε'-(εC+6g)=t
(stretch amount) is obtained.

In this way, since the stretch amount ε at that point can be determined, the stretch amount can be easily controlled. Here, if the required stretch amount is 60, then the L/Tti amount 6 is calculated by the function generator 21 that stores this required stretch amount 60.
(Fig. 1), and the function generator 21 inputs ('(+'
) is output. The function f(ε) is multiplied by the integrating unit 22 to give the required moving speed vo=Kf(t) of the cylinder 1.2. Kono v0 is F
It is compared with the output signal V from the speed detector 5 in the comparator 23, and the difference (Vo V, ) is output. difference(
vo-V) is input to the PI calculation unit 24, and the PI calculation unit 2
4 is a hydraulic pump 25.26 driving the cylinder 2.1;
A signal s2 for controlling the discharge amount is output. This signal S is transmitted to the hydraulic pump 2 via the a reduction section 27 and the amplification section 28.
5, and is also input to the hydraulic pump 26 via an adder 29 and an amplifier 30. Said position detector 3.4
The output signals xt and x2 are input to the subtraction unit 31 and the difference ΔX
= (X2-xl), and this difference (X2-Xi) is P
After being subjected to arithmetic processing in the I calculation section 32, it is input to the subtraction section 27 and addition section 29. Difference processed by PI calculation (x2-
xl) is a signal for correcting the output signal S.

This makes it possible to equalize the amount of movement of both cylinders 1.2.

In this example, the longitudinal elastic modulus E is known, and the calculation process is performed using 'P:, but when the stretch amount 61 is calculated using the longitudinal elastic modulus El, which is different from the actual longitudinal elastic modulus E, the actual stretch The error Δε with respect to quantity 8 is as follows. (4th
(See figure) Δa=a-gl=(σ-σc)X(1-E/El)
,'atTo prevent such errors from occurring, the fifth
The second embodiment using the arithmetic processing section shown in the figure should be applied.

In FIG. 5, the arithmetic processing section includes n comparators 17.
-1 to 17-71, each comparator 17-1 to
17-n are switches 15-1 to 15-7L, respectively;
16-1 to 16-? ! can be driven. Switch 15-
l-15-fi stores the value of ε′ in the storage units 33-1 to 33-n.
The switches 16-1 to 16-n transmit the data to all storage units 33-1 to 33-fi of σ.

Different σ values σ10 to σf%□ within the elastic limit of the stretched material are input to each of the comparators 17-1 to 17-n, and the comparators 17-1 to 17-n have input values of σ10 to σf%□. .about..sigma.noVC, at that point in time, 6' is inputted into the storage units 33-1 to 33-9. In addition to σ and ε', the storage units 33-1 to 33-n also store data such as (=')'', 6
For example, the storage unit 33-1 stores σlO and the corresponding a(Ol(ε'lo)'', ε'
10 x σ10'k, storage section 33-fi.

σ′no and the corresponding ε′? IQ, (t/
ft, ) l, ε′no×σno are stored. As shown in FIG. 6, σlO stored in this way...
・σno-"10...ano is a plurality of points 1.2,...F1 on the stress-strain diagram within the elastic limit
shows. A calculation unit 34 is connected to the storage units 33-1 to 33-n, and the calculation unit 34 calculates the regression line of points 1.2, . . . n, that is, the portion within the elastic limit of the stress-strain diagram. The longitudinal elastic modulus E and the initial sag amount tc are calculated from the least squares approximation.

By taking multiple measured values within the elastic limit in this way, it is possible to minimize the error Δε in the amount of stretch described above.
Stretching f: Can be properly controlled.

〔Effect of the invention〕

As mentioned above, the method for controlling the amount of stretch of the scraper leveler according to the present invention grasps the stress-strain characteristic sound of the part to be stretched during the stretching process of the wrinkle-stretched abrasive material, so the stretch M
It has an excellent effect of being able to control k f& to an appropriate value.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing a control device used in a first embodiment of the present invention, Fig. 2 is a block diagram showing a calculation processing section in the same embodiment, and Fig. 3 explains the calculation process in the same embodiment. Fig. 4 is a stress-strain diagram for explaining the entire error occurrence situation in the first embodiment, and Fig. 5 is a stress-strain diagram for explaining the entire error occurrence situation in the first embodiment. FIG. 6 is a block diagram showing the processing section 9, and FIG. 6 is a stress-strain diagram for explaining the operation process in the same embodiment. 1.2...Cylinder, 3.4...Position detector, 5.
... Speed detector, 6... Addition section, 7... Division section, 8
...Distracted part, 9.10...Pressure sensor, 11...
- Addition unit, 12... Arithmetic processing unit, 13.14... Storage unit, 15.16... Switch, 17... Comparator, 18... Addition unit, 19... Integration unit, 2o ,2
0'... Subtraction unit, 21... Function generator, 22...
Integration unit, 23... Comparison unit, 24... PI calculation unit 52
5.26...Hydraulic pump, 27...Subtraction section, 28.
... Amplification section, 29... Addition section, 30... Addition section, 31... Subtraction section, 32... PI calculation section, 33-1
~33-n... Storage unit, 34... Arithmetic unit. Agent Tatsuyuki Unuma (and 1 other person)

Claims (1)

[Claims] (1) When stretching a material to be stretched with a stretcher repeller, detect the stress-strain characteristic within the elastic limit of the material to be stretched, memorize this stress-strain characteristic, and store this stress-strain characteristic. Find the initial slack f1 based on the corner characteristics,
determining the amount of springback based on the stress-strain characteristics when the stretched material is stretched beyond its elastic limit;
A stretch amount control method for a stretcher leveler, which calculates a stretch amount at that point from this springback amount and the initial slack amount, and controls the stretch amount based on the thus determined stretch amount.