JPH071041A - Straightening device - Google Patents

Abstract

(57) [Abstract] [Purpose] The present invention aims to shorten the correction time by performing accurate correction even if the yield points of the metal members are different. [Structure] A displacement measuring means for measuring a displacement amount of a metal member between each press head, a pushing amount measuring means for measuring a pushing amount of a press head, and a virtual pushing amount corresponding to a pushing amount measured by the pushing amount measuring means. A virtual value deriving means (22) for obtaining a displacement amount and a virtual displacement coefficient, and a plastic progress for obtaining a plastic progress value which is a difference between the virtual displacement amount obtained by the virtual value deriving means and the displacement amount measured by the displacement measuring means. Detection means (2
3), correction amount calculation means (24) for obtaining the current correction amount based on the plastic progress value obtained by the plastic progress detection means and the virtual displacement coefficient obtained by the virtual value derivation means, and the correction amount calculation means. A straightening device provided with a press stopping means (25) for comparing the current straightening amount and the required straightening amount, and stopping the press when the current straightening amount becomes equal to or larger than the required straightening amount.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a straightening device for straightening a shape of a long metal member such as a rod, a shaft and a guide rail for an elevator, and more particularly to a displacement of the metal member between press heads. The present invention relates to a straightening device that can perform straightening based on an amount and improve straightening accuracy.

[0002]

2. Description of the Related Art Generally, for a metal member such as an elevator guide rail, when a desired straightness is obtained, a shape is measured to determine whether the straightness is within an allowable value or not, and the bending is more than the allowable value. A straightening device that straightens a sheet with a press is widely used.

FIG. 12 is a perspective view showing the outer appearance of this type of correction device. In this straightening device, a long rail 2 is arranged on an upper part of a long measuring table 1, and a measuring device 3 is mounted on the rail 2 so as to be movable in the longitudinal direction of the rail 2. The measuring device 3 measures the shape of the metal member 4 and sends measurement data to the control device 5.

A plurality of roller bases 6 and a plurality of overturning bases 7 are provided on the side of the measuring base 1 with appropriate intervals.
Are arranged in parallel with. Each roller table 6 has a carrying roller 8 for carrying the metal member 4 and a positioning roller 9 for positioning the metal member 4, and each rollover table 7 holds the metal member 4 at 90 °.
It has a function to roll over only once. Further, on the extension lines of the roller base 6 and the overturning base 7, the press device 11,
A plurality of transport roller bases 12 having a transport roller 8 and a plurality of rollover bases 7 are provided.

The pressing device 11 includes three fixed press heads 13a to 13 for pressing the metal member 4 between them.
c, three moving press heads 14a to 14c, and three displacement gauges 15a to 15c for measuring the displacement of the metal member at the press head positions. In addition, each fixed press head 13a to 13c and each movable press head 14
Each of a to 14c is composed of a press head at both ends and a central press head that can move in the vertical direction.
3a to 13c and moving press heads 14a to 14c, one of the press heads 13a and 13c (14
When using a, 14c), three-point press is performed so that the other press head 14b (13b) in the center is used.

The measuring device 3, each roller base 6, each transport roller base 12, and each rollover base 7 are controlled by a controller 5. FIG. 13 is a block diagram showing the configuration of this control device.

The control device 5 comprises an input / output unit 16, a computing device 17 and a storage device 18. First, the arithmetic unit 17 rotates the transport roller 8 via the input / output unit 16 to transport the metal member 4 to a predetermined position, and then rotates the positioning roller 9 via the input / output unit 16 to rotate the metal member 4. The member 4 is positioned at the measurement position.

Subsequently, the arithmetic unit 17 controls the measuring device 3 via the input / output unit 16, and the measuring device 3 moves along the longitudinal direction of the rail 2 to measure the shape of the metal member 4. Further, the measuring device 3 sends the measurement data to the control device 5, and the control device 5 stores the measurement data in the storage device 18.

As described above, when the measurement is completed, the arithmetic unit 17 conveys the metal member 4 to the press unit 11 by rotating the convey roller 8 via the input / output unit 16 based on the measured data. Let

The metal member 4 is conveyed until the correction point reaches the pressing position, and is pressed by the fixed press heads 13a and 13c and the moving press head 14b to correct its shape.

For example, the metal member 4 is shown in FIG.
It is assumed that the required correction amount f is provided as shown in (a). In addition,
This required correction amount f is calculated based on the measurement data by the arithmetic unit 17
Is sought by.

The arithmetic unit 17 controls the moving press head 14b to be pushed by the pushing amount x corresponding to the required correction amount f, and deforms the metal member 4 as shown by the solid line in FIG. 14 (b). Then, the moving press head 14b is removed, and the metal member 4 is straightened by the required straightening amount f as shown in FIG. 14 (c).

The metal member 4 which has been sequentially corrected is a conveying roller 8.
Transported by. When the straightening is completed, the transport roller 8 is reversed and the metal member 4 is transported to the measuring instrument 3 side,
The shape of the metal member 4 is measured again. At this time, even if the correction is once performed, if there is still a deviation beyond the allowable range, the metal member 4 is conveyed by the conveyance roller 8 and is corrected again by the press as in the above.

If all are within the allowable range, the correction in one direction is completed, the metal member 4 is rotated 90 degrees, the shape is measured again, and the correction is performed. Here, the arithmetic unit 1
The process of calculating the pushing amount x corresponding to the required correction amount f in 7 will be described.

FIG. 15 shows the required correction amount f corresponding to the pushing amount x.
It is a figure which shows the relationship of. This relationship shows that when the pushing amount x is small, the required correction amount f is zero due to the elastic region, and when the pushing amount x is large, the pushing amount x is due to the plastic region.
And the required correction amount f are represented by a hyperbolic approximation graph showing a proportional relationship.

Here, the inclination of the graph of the plastic region is A, and the intersection with the axis of the pushing amount x when extrapolating to the elastic region with this value of A is xo, and the intercept with the axis of the required correction amount f is taken. Letting B be the distance between the hyperbolic graph and the intersection xo, the following equations (1) to (5) are established.

Θ = tan ⁻¹ (A / 2) (1) α = β / tan θ (2) K = (α ² + β ² ) (x + B / A) sin θ · cos θ (3) M = β ² sin ² θ · α ² cos ² θ (4) Required correction amount f = (− k ± (k ² −Mα ² β ² ) ^1/2 ) / M (5) Therefore, the arithmetic unit 17 uses the measured data. The pushing amount xa is calculated by using the equations (1) to (5) based on the required correction amount fa obtained from Then, push in x as described above.
Push in the press by a and move the metal member 4 to the required correction amount fa
I am just correcting. In this way, when the correction in the two directions is completed, the metal member 4 is conveyed by the conveyance roller 8, and the correction of the metal member 4 is completed.

[0018]

However, in the above-mentioned straightening device, the required straightening amount f is obtained based on only the experimental data.
Since the indentation amount xa is calculated from a, when the component contained in the metal member 4 is subtly different and the yield point at which the elastic region is changed to the plastic region is different, the indentation amount calculated by the experimental data as shown in FIG. When the press is pushed with xa, the actual correction amount becomes fb, which is a problem.

Therefore, since the correct correction cannot be performed and the correction is repeated many times, there is a problem that the correction takes time. The present invention has been made in consideration of the above situation, even if the yield point of the metal member is different, correct the correct,
An object of the present invention is to provide a straightening device capable of shortening the straightening time.

[0020]

According to a first aspect of the present invention, a shape of a metal member is measured to obtain a required correction amount of the shape, and the metal member is divided into a press head at both ends and a press head at the center. In a straightening device that straightens the shape by the required straightening amount by pressing so as to sandwich it, the displacement measurement is arranged between the press heads at both ends and the central press head, and measures the displacement amount of the metal member. Means, a pressing amount measuring means for measuring the pressing amount of the central press head, and a virtual displacement amount when the elastic region of the metal member is extended corresponding to the pressing amount measured by the pressing amount measuring means. And a virtual value deriving means for obtaining a virtual displacement coefficient, and a plastic progress value which is a difference between the virtual displacement amount obtained by the virtual value deriving means and the displacement amount measured by the displacement measuring means. Plastic progress detecting means, correction amount calculating means for obtaining the current correction amount based on the plastic progress value obtained by the plastic progress detecting means and the virtual displacement coefficient obtained by the virtual value deriving means, and the correction amount calculation The present invention is a straightening device comprising: a press stopping unit that compares the current correction amount obtained by the means with the required correction amount, and stops the press when the current correction amount is equal to or larger than the required correction amount.

In the invention according to claim 2, the shape of the metal member is measured to obtain the required correction amount of the shape, and the metal member is pressed so as to be sandwiched between the press heads at both ends and the press head in the center. By doing so, in the straightening device that straightens the shape by the required straightening amount, a displacement measuring unit that is disposed between the press heads at both ends and the central press head, and that measures the amount of displacement of the metal member, A pushing amount measuring means for measuring the pushing amount of the central press head, and a virtual displacement amount and a virtual displacement coefficient when the elastic region of the metal member is extended corresponding to the pushing amount measured by the pushing amount measuring means. And a plastic value for deriving a plastic progress value which is a difference between the virtual displacement amount calculated by the virtual value deriving unit and the displacement amount measured by the displacement measuring unit. Based on the output means, the virtual displacement coefficient obtained by the virtual value deriving means and the required correction amount, the plastic progress value obtained by the plastic progress detection means becomes a value corresponding to the required correction amount. A stop value derivation means for obtaining a stop value is compared with the plastic progress stop value obtained by this stop value derivation means and the plastic progress value obtained by the plastic progress detection means, and this plastic progress value is the plastic progress stop value. When it becomes the above, it is a straightening device provided with the press stop means which stops the said press.

[0022]

Therefore, in the invention corresponding to claim 1, the displacement measuring means is arranged between the press heads at both ends and the central press head to measure the displacement amount of the metal member by taking the above means. The pushing amount measuring means measures the pushing amount of the central press head, and the virtual value deriving means extends the elastic region of the metal member corresponding to the pushing amount measured by the pushing amount measuring means. The displacement amount and the virtual displacement coefficient are obtained, the plastic progress detection means obtains the plastic progress value which is the difference between the virtual displacement amount obtained by the virtual value deriving means and the displacement amount measured by the displacement measuring means, and the correction amount calculating means. Is the current correction amount calculated by the correction amount calculation means by the press stop means based on the plastic progress value obtained by the plastic progress detection means and the virtual displacement coefficient obtained by the virtual value derivation means. The positive amount and the required correction amount are compared, and the press is stopped when the current correction amount becomes the required correction amount or more, so even if the yield point of the metal member is different, correct the correction and shorten the correction time. Can be planned.

Further, in the invention according to claim 2, the displacement measuring means is arranged between the press heads at both ends and the central press head to measure the displacement amount of the metal member, and the pushing amount measuring means is arranged at the center. The press amount of the press head is measured, and the virtual displacement amount and the virtual displacement coefficient when the elastic region of the metal member is extended by the virtual value derivation means corresponding to the push amount measured by the press amount measuring means are calculated, and the plasticity is calculated. The progress detection means obtains the plastic progress value which is the difference between the virtual displacement amount obtained by the virtual value deriving means and the displacement amount measured by the displacement measuring means, and the stop value deriving means obtains the virtual value obtained by the virtual value deriving means. Based on the displacement coefficient and the required correction amount, the plastic advancement value obtained by the plasticity advancement detecting means becomes a value corresponding to the required correction amount, and the plastic advancement stop value is obtained.The press stopping means obtains the stop value deriving means. The plastic progress stop value and the plastic progress value obtained by the plastic progress detection means are compared, and the press is stopped when the plastic progress value is equal to or greater than the plastic progress stop value. Since the values are directly compared, the signal processing can be performed at high speed, and the correction time can be further shortened.

[0024]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a straightening device according to a first embodiment of the present invention, and FIGS. 2 and 3 are diagrams showing a displacement gauge arranged in a press device of the straightening device. 12 and FIG. 13 are assigned the same reference numerals and detailed description thereof will be omitted, and only different portions will be described here.

That is, the apparatus of this embodiment is different from the apparatus shown in FIG. 13 in that the measuring unit 21, the virtual value deriving unit 22, the plasticity progress detecting unit 23, and the correction value calculating unit 24 are used instead of the arithmetic unit 17.
Further, an arithmetic unit 26 having the function of the press stop unit 25 is provided, and displacement gauges 27B and 27D are added between the press heads 13a and 13c at both ends and the press head 13b at the center in addition to the device shown in FIG. Then, it is configured to include a total of five displacement gauges 27A to 27E. The displacement gauges 27A, 27C, and 27E are the same as the displacement gauges 15A to 15C of the related art except that the reference numerals of the conventional displacement gauges 15A to 15C are changed.
Further, since the displacement gauges 27A to 27E have the same configuration, the displacement gauge 27A will be taken as an example and the constituent elements will be described with the suffix a.

In the displacement meter 27A, an inverted L-shaped displacement gauge main body 28a is erected above the press head on the press machine 11, and a measuring arm 30a is pivoted around a central portion 30a 'of the displacement gauge main body 28a. Is rotatably attached in parallel with the longitudinal direction of the displacement gauge body 28a. Measuring arm 30a
Is connected to the displacement meter main body 28a via a spring member 31a and is urged by the spring member 31a so as to be separated from the displacement meter main body 28a. Measuring head 3
2a is brought into contact with the metal member 4. Further, the upper part of the measurement arm 30a is controlled to approach and leave the displacement meter main body 28a by a measurement control mechanism 33a attached to the upper part of the displacement meter main body 28a. On the other hand, the measurement control mechanism 3
The displacement detector 34a attached below 3a has a function of measuring the distance between the displacement meter main body 28a and the measuring arm 30a, and sending the measurement signal to the measuring unit 21 in the arithmetic unit 26.

The measuring unit 21 measures the flexural displacement amount of the metal member 4 and the pressing amount of the press head based on the measurement signal received from the displacement gauges 27A to 27E via the input / output unit 16, and the pressing amount data x And the deflection displacement amount data y are sent to the virtual value deriving unit 22, and the deflection displacement amount data y
Is sent to the plasticity progress detector 23.

When the virtual value deriving unit 22 receives the pushing amount data x from the measuring unit 21, the virtual displacement coefficient is obtained by taking the ratio of the bending displacement amount data y to the pushing amount data x during elastic deformation of the metal member 4. Data a is obtained and sent to the correction amount calculation unit 24, and virtual displacement amount data is obtained from the pushing amount data x during plastic deformation based on the virtual displacement coefficient data a and sent to the plastic progress detection unit 23. Is. It should be noted that each virtual data represents a value when the elastic region is assumed to be extended during the plastic deformation of the metal member 4.

The plasticity progress detection unit 23 includes a virtual value derivation unit 22.
The difference between the virtual displacement amount data received from the measuring unit 21 and the deflection displacement amount data y received from the measuring unit 21 is calculated, and the calculation result is sent to the correction amount calculating unit 24 as the plastic progress value data C.

The correction amount calculation unit 24 includes a plasticity progress detection unit 23.
The current correction amount data fc is obtained based on the plastic progress value data C received from the virtual value deriving unit 22 and the virtual displacement coefficient data a received from the virtual value deriving unit 22, and the current correction amount data fc is sent to the press stop unit 25. .

The press stop unit 25 compares the current correction amount data fc received from the correction amount calculation unit 24 with the required correction amount data f stored in the storage device 18, and the current correction amount data fc shows the required correction amount. It has a function to stop the press when the data becomes more than the data f. The input / output unit 1
6, the arithmetic unit 26 and the storage unit 18 constitute a control unit 35.

Next, the operation of the correction apparatus having the above structure will be described with reference to the flowchart of FIG. Now
The shape of the metal member 4 is measured by the measuring device 3 as described above, and the measuring device 3 sends the measurement signal to the arithmetic unit 26 via the input / output unit 16. The arithmetic unit 26 obtains the required correction amount data f of the metal member 4 for each correction point based on the measurement signal, and stores the required correction amount data f in the storage device 18.

Further, after the shape measurement is completed, the metal member 4 is conveyed to the press device 11 and positioned so that the correction point comes to the press position as shown in FIG. 5 (a). Here, the control device 35 controls the press device 11 to push in the central press head 14b as shown in FIG. 5 (b) (ST
1). On the other hand, the displacement gauge 27A~27E measures the displacement of the metal member 4 at this time (ST2), the measuring unit of the arithmetic unit 26 the displacement measurement signal A _s to E _s through the output unit 16 21. Measurement unit 21, displacement measuring signal A _s
Based on ~ E _s , the pressing amount x of the press head is measured as shown in the following equation (6), and also, as shown in FIGS.
As shown in the equation, the displacement amount of the metal member 4 between the press heads (hereinafter referred to as the deflection y) is measured.

Push amount x = C _s − ((A _s + E _s ) / 2) (6) Deflection y = B _s − ((A _s + C _s ) / 2) (7) Here, push amount x 6 to FIG.
Will be explained.

As shown in FIG. 6, in the elastic region of the metal member 4 being straightened, the deflection y is inclined to the pushing amount x and the inclination a = 3 /
16 is proportional. In addition, the pushing amount x is the yield point (not shown).
When the metal member 4 enters the plastic region after passing, the deflection y is proportional to the pushing amount x with an inclination smaller than 3/16.

The inclination a in the elastic region is a = 3/16
Is calculated as shown in FIG. As shown in the figure, when a concentrated load W is applied to the midpoint of the metal member 4 of length L whose both ends are supported, the elastic constant of the metal member 4 is E, and the second moment of area of the metal member 4 is Iz. Then, the deflection y is expressed by the following equation (8).

Deflection y = WL ³ / 48EIz (8) Further, the deflection y at a point separated from the supporting point at one end by d is given by the following equation (9) when d = L / 4.

Deflection y = 11 WL ³ / (16 · 48EIz) (9) Therefore, the deflection at d = L / 4 is 11/16 of the deflection at d = L / 2. When this is made to correspond to a press, the position of the press head becomes a support point and a concentrated load point. Also,
The displacement amount of the metal member 4 at the press head intermediate point when the press presses the metal member 4 is 11/16 of the displacement amount of the load point of the press head. The displacement amount at the press head intermediate point is a value obtained by adding the deflection y to the displacement amount at the press head load point. Therefore, the inclination and deflection y of the straight line portion in FIG.
Are shown in the following (10) and (11).

Slope a = 11 / 16−1 / 2 = 3/16 (10) Deflection y = 3WL ³ / (16 · 48EIz) (11) Note that the concentrated load W in the equation (11) is the pushing amount x. It corresponds to.

Next, the plastic region deviating from the inclination a will be described. First, as shown in the strain-stress diagram of FIG.
The metal member 4 generates strain ε when the pushing pressure is increased, and in the elastic region until the strain ε reaches the yield point, the stress σ and the strain ε have a proportional relationship with a slope of the elastic constant E.

Next, in the plastic region after the strain ε reaches the yield point, the stress σ and the strain ε have a steep proportional relationship with a small inclination. The elastic constant E differs depending on the type of the metal member 4, and the yield point has a different value even when the content ratio of carbon or the like is different even between the metal members of the same type or when plastic deformation is performed once.

In the plastic region, when the metal member 4 is strained by the pressure P1 and then the pressure P1 is unloaded,
The deformation returns as shown by the dashed line, leaving the final deformation. This deformation is the correction amount f.

On the other hand, the pressure P (stress σ) and the deflection y are in a proportional relationship as shown in FIGS. 9 and (11). Therefore, when the stress σ in FIG. 8 is converted into the deflection y and the strain ε is converted into the indentation amount x, the deflection y and the indentation amount x during straightening are converted.
Has a proportional relationship in which the slopes are different in the elastic region and the plastic region as shown in FIG. Further, as shown in the figure, the inclination a of the virtual line Y _E when the elastic region is extended is defined as the virtual displacement coefficient data a, and the difference between the pushing amount x in the plastic region and the virtual line Y _{E at} that time is the plastic progress value. Given the data C, the required correction amount f is calculated by C / a. It should be noted that the deflection y corresponding to the indentation amount xf for which the plastic progress value data C has been obtained
The point i (xi, yi) on the imaginary line Y _E of i has the property of moving on the imaginary line Y _E along with the plastic progression value data C,
It is similar to the yield point but different from the yield point.

The apparatus of this embodiment straightens the metal member 4 based on the relationship between the pushing amount x and the deflection y during straightening shown in FIG. That is, the measuring unit 21 uses the pushing amount data x indicating the pushing amount x of the equation (6) and the deflection y of the equation (7).
Is sequentially sent to the virtual value derivation unit 22, and the flexure displacement amount data y is sent to the plasticity progress detection unit 23.
Send to.

When the virtual value deriving unit 22 receives the pushing amount data from the measuring unit 21, the pushing amount data x in the elastic region is received.
The ratio of the change in the flexure displacement amount data y to the change in is taken to obtain the slope a = 3/16 as the virtual displacement coefficient data a. The virtual value derivation unit 22 sends the virtual displacement coefficient data a to the correction amount calculation unit 24. Further, the virtual value derivation unit 22 multiplies the virtual displacement coefficient data a by the pushing amount data xc during plastic deformation, and the virtual displacement amount data yE (=
a.xc) is sent to the plasticity progress detector 23.

The plasticity progress detector 23 receives the virtual displacement amount data yE and the deflection displacement amount data y received from the measuring unit 21.
The difference from c is calculated (ST3), and the calculation result is sent to the correction amount calculation unit 24 as plastic progress value data Cc.

The correction amount calculation unit 24 determines the plastic progress value data C
c is divided by the virtual displacement coefficient data a to obtain the current correction amount data fc (= Cc / a) (ST4), and the current correction amount data fc is sent to the press stop unit 25.

The press stop unit 25 compares the current correction amount data fc with the required correction amount data f stored in the storage device 18 (ST5), and the current correction amount data fc becomes equal to or larger than the required correction amount data f. Then, the pressing device 11 is stopped (ST6).

The arithmetic unit 26 also unloads the pressure of the central press head 14b from the metal member 4. Metal member 4
When the pressure is unloaded, the deflection y becomes zero and becomes straight. After that, the arithmetic unit 26 conveys the metal member 4 to the next correction point by the conveyance roller 8 and the positioning roller 9 and corrects it as described above.

As described above, according to the first embodiment, attention is paid to the relationship between the pressing amount x of the central press head 14b and the deflection y between both ends and the central press head, and the relationship is taken into account during the pressing. Since the current correction amount data fc is actually measured for each correction point of the member 4 and the current correction amount data fc is compared with the required correction amount f to stop the press, unlike the conventional case, Even if the yield point of the metal member 4 is different, accurate correction can be performed and the correction time can be shortened.

Further, according to this embodiment, since the virtual displacement coefficient data a is obtained by actually measuring the ratio of the pushing amount x and the deflection y in the elastic region, the elastic constant E of the metal member 4 is different. Correct even if correct. Therefore, the operability can be improved without resetting the setting in the arithmetic device for each type of the metal member 4.

Further, according to the present embodiment, since it has a simple structure in which two displacement gauges are added to the conventional device and the internal processing of the arithmetic unit is changed, it can be easily implemented. Next, a correction device according to a second embodiment of the present invention will be described with reference to the drawings. FIG. 11 is a block diagram showing the configuration of this correction device. The same parts as those in FIG. 1 are designated by the same reference numerals and detailed description thereof will be omitted, and only different parts will be described here.

That is, the apparatus of the present embodiment, compared with the apparatus shown in FIG. 1, obtains the plastic progress value Cf corresponding to the required correction amount f, and directly compares the plastic progress value Cf with the plastic progress value C to successively calculate the present value. In order to speed up the operation by omitting the process of obtaining the correction amount f of
4 and the press stop unit 25, instead of the virtual value deriving unit 22,
A stop value derivation unit 36 connected to the plastic progress detection unit 23 and the storage device 18, and a press stop unit 37 connected to the stop value derivation unit 36 and the plastic progress detection unit 23 are provided.

Here, the stop value derivation unit 36 stores the virtual displacement coefficient data a received from the virtual value derivation unit 22 and the storage device 18.
It is multiplied by the required correction amount f read from
The plastic advancement stop value Cf (= a · f) at which the plastic advancement value C obtained by 3 becomes a value corresponding to the required correction amount f is obtained, and the plastic advancement stop value Cf is sent to the press stop portion 37.

The press stop portion 37 compares the plastic progress stop value Cf with the plastic progress value C sequentially obtained by the plastic progress detecting portion 23. When the plastic progress value C becomes equal to or greater than the plastic progress stop value Cf, the press stop portion 37 presses. To stop.

As described above, according to the second embodiment, since the stop value derivation unit 36 is provided, unlike the first embodiment, the plastic progress value C is changed to another variable (current correction amount). Since the press is stopped at the desired required correction amount f without sequentially obtaining the above, the processing speed can be increased in addition to the effect of the first embodiment.

In the first and second embodiments, the case where the pressing amount of the press is controlled to perform the correction has been described, but the present invention is not limited to this, and the pressure may be controlled to perform the correction. The present invention can be implemented in the same manner to obtain the same effect.

Further, in the first embodiment, the case where the virtual displacement coefficient data a is obtained based on the ratio between the pushing amount and the deflection has been described. However, the present invention is not limited to this, and it is based on the elastic constant E of the metal member ( The virtual coefficient data a is directly calculated by the equation 11).
However, the same effect can be obtained by implementing the present invention in the same manner. In addition, the present invention can be modified in various ways without departing from the scope of the invention.

[0059]

As described above, according to the present invention, the displacement measuring means is disposed between the press heads at both ends and the central press head to measure the displacement amount of the metal member, and the pushing amount measuring means is arranged at the center. The press amount of the press head is measured, and the virtual displacement amount and the virtual displacement coefficient when the elastic region of the metal member is extended by the virtual value derivation means corresponding to the push amount measured by the press amount measuring means are calculated, and the plasticity is calculated. The progress detection means obtains a plastic progress value which is the difference between the virtual displacement amount obtained by the virtual value derivation means and the displacement amount measured by the displacement measurement means, and the correction amount calculation means determines the plasticity obtained by the plastic progress detection means. The current correction amount is obtained based on the virtual displacement coefficient obtained by the progress value and the virtual value deriving means, and the press stopping means compares the current correction amount and the required correction amount obtained by the correction amount calculating means with each other. Since so as to stop the press when the correction amount of standing is more demand correction amount, even if the yield point of the metal member are different, it is possible to shorten the correction time provides accurate correction.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of a correction device according to a first embodiment of the present invention.

FIG. 2 is an external view of a press device and a displacement meter arranged therein in the same embodiment.

FIG. 3 is a front view showing a configuration of a displacement meter according to the same embodiment.

FIG. 4 is a flowchart showing an operation in the embodiment.

FIG. 5 is a schematic view of a press for explaining the operation in the same embodiment.

FIG. 6 is a diagram for explaining the relationship between the pushing amount and the deflection in the embodiment.

FIG. 7 is a view for explaining the relationship between the pushing amount and the deflection in the embodiment.

FIG. 8 is a strain-stress diagram for explaining the relationship between the pushing amount and the deflection in the example.

FIG. 9 is a pressure-deflection diagram for explaining the relationship between the pushing amount and the deflection in the example.

FIG. 10 is a view for explaining the relationship between the pushing amount and the deflection in the same embodiment.

FIG. 11 is a block diagram showing the configuration of a correction device according to a second embodiment of the present invention.

FIG. 12 is a view showing the appearance of a conventional straightening device.

FIG. 13 is a block diagram for explaining a configuration of a control device applied to a conventional correction device.

FIG. 14 is a schematic view of a press for explaining a conventional operation.

FIG. 15 is a diagram for explaining a relationship between a conventional pressing amount and a correction amount.

[Explanation of symbols]

21 ... Measuring unit, 22 ... Virtual value derivation unit, 23 ... Plasticity progress detection unit, 24 ... Correction value calculation unit, 25 ... Press stop unit, 27
A to 27E ... Displacement meter, x ... Indentation amount, y ... Deflection, f ... Straightening amount, C ... Plastic progress value.

Claims (2)

[Claims] 1. The shape is requested by measuring the shape of the metal member to obtain a required correction amount of the shape and pressing the metal member so as to be sandwiched between the press heads at both ends and the press head at the center. In a straightening device that corrects only a straightening amount, a displacement measuring unit that is disposed between the press heads at both ends and a central press head, and that measures a displacement amount of the metal member, measures a pushing amount of the central press head. And a virtual value deriving means for obtaining a virtual displacement amount and a virtual displacement coefficient when the elastic region of the metal member is extended corresponding to the push amount measured by the push amount measuring means, A plastic progress detecting means for obtaining a plastic progress value which is a difference between the virtual displacement amount obtained by the virtual value deriving means and the displacement amount measured by the displacement measuring means; Correction amount calculation means for obtaining a current correction amount based on the plastic progress value obtained by the step and the virtual displacement coefficient obtained by the virtual value derivation means, and the current correction amount obtained by the correction amount calculation means and A straightening device comprising: a press stopping unit that compares the required straightening amounts and stops the press when the current straightening amount is equal to or larger than the required straightening amount. 2. The shape is requested by measuring the shape of the metal member to obtain a required correction amount of the shape and pressing the metal member so as to be sandwiched between the press heads at both ends and the central press head. In a straightening device that corrects only a straightening amount, a displacement measuring unit that is disposed between the press heads at both ends and a central press head, and that measures a displacement amount of the metal member, and measures a pushing amount of the central press head. And a virtual value deriving means for obtaining a virtual displacement amount and a virtual displacement coefficient when the elastic region of the metal member is extended corresponding to the push amount measured by the push amount measuring means, A plastic progress detecting means for obtaining a plastic progress value which is a difference between the virtual displacement amount obtained by the virtual value deriving means and the displacement amount measured by the displacement measuring means; and the virtual value deriving means. Based on the virtual displacement coefficient and the required correction amount obtained by, the stop value derivation means for obtaining the plastic progress stop value at which the plastic progress value obtained by the plastic progress detection means becomes a value corresponding to the required correction amount. Comparing the plastic progress stop value obtained by the stop value deriving means and the plastic progress value obtained by the plastic progress detecting means, and when the plastic progress value is equal to or more than the plastic progress stop value, the press is stopped. A straightening device comprising: a press stopping means for controlling the press.