JPH0688084B2 - Folding device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bending apparatus for bending a steel plate or the like, and more particularly to a bending apparatus suitable for obtaining a highly accurate bending angle.

[Background of the Invention]

In the conventional bending apparatus as disclosed in JP-A-57-41826, a digital table, a rotary table, a centering device and a bending machine main body are combined to transfer and bend a work. It is automated. The bending width dimension and the angle are automatically controlled by the control device.
However, in particular, the bending angle has a large variation between the lots due to the material characteristics such as the spring back of the work, and it is difficult to bend the bent angle based on the data created (programmed) in advance at a predetermined angle.
Therefore, trial bending is performed every time the lot of the work is different, and the optimum bending condition is selected by trial and error. In addition, this trial bending, after bending, angle measurement,
It was a repetition of data correction and re-processing, and it was a network for automation with human hands. Further, the trial-bent product often becomes unusable as a product due to a poor angle, which is a problem.

[Object of the Invention]

It is an object of the present invention to provide a bending device that can always perform bending at a predetermined angle by one bending process even if there are variations in the material properties of a work.

[Outline of Invention]

The present invention, by the measuring device installed in the folding device,
The bending angle of the work is automatically measured, this data is compared with the basic material property data obtained in advance, and the bending angle of the work by the bending device (the angle of the wing type) is corrected. Even if there is a variation between the lots of the work piece, it will always be 1 by bending the work piece with the correction value.
This is to bend at a predetermined angle by bending once.

Example of Invention

 Examples of the present invention will be described below.

FIG. 1 shows an embodiment of the present invention.

In the figure, a cylinder 3 is fixed to a base 2. The cylinder 3 serves as a drive source for the base 2 and the column.
The ram 5 moves up and down with the support 4 installed between 16 as a guide. A clamp die 25 is installed on the ram 5 as shown in FIG. A cylinder 23 is fixed to the base 2 as shown in FIG. Due to this cylinder 23, the wing die 24 performs a wing operation with the back up 15 as a guide as shown in FIG. Also, this backup
Reference numeral 15 is fixed to the base 2 and is structured so as to be slidably held with the ram 5.

Further, a front table 29 having a drive belt 8 for conveying and positioning the work 22 in the longitudinal direction as shown in FIG. 4 set on the base 7, a motor 9 installed on the frame 6 and a screw shaft 14 as drive sources. Stopper 10 that moves in the front-back direction,
The work 22 is positioned and conveyed by a turning device 12 that turns the work 22 by the cylinder 11.

A bar 17 is installed on the back-up 15 as shown in FIG. A block 18 is installed on the bar 17, and a measuring head 20 is provided so as to slide with the block 18 as a guide. This measuring head 20 is a cylinder
The drive source is 19, and the linear gauge sensor 21 is set.

In this way, the bar 17, the block 8, the cylinder 19,
The measuring head 20 and the linear gauge sensor 21 constitute a measuring device 30.

These series of devices are integratedly controlled by the control device 13.

First, the work 22 is conveyed and positioned by the drive belt 8 to a predetermined position in the longitudinal direction. Next, using the stopper 10, the clamp die 25 and the base 2 are adjusted so that the bending width becomes a predetermined value.
It is inserted and positioned. The set work 22 is
The clamp die 25 and the base 2 are tightly gripped by the cylinder 3. When the work 22 is clamped, the wing 24 is winged by the cylinder 23 as shown in FIG. 3, and the work 22 is bent along the bending line of the clamp 25. At this time, the wing mold 24 measures the wing angle by an encoder (not shown), and when the wing angle reaches the angle set in the control device 13 in advance, it is returned to the original state by the cylinder 23.

When the bending of one side is completed, the Knimp mold 25 rises, the work 22 is pulled out by the stopper 10, the other side of the work 22 is indexed by the turning device 12, and bending work is performed in the same procedure. When all the processing is completed, it is carried out by the drive belt 8.

At this time, when a measurement start signal is output by a command from the control device 13, the wing die 24 reaches the preset wing angle, and after the cylinder 23 returns to the original state, the cylinder 19 causes the wing die 24 to return to its original state. , Measurement head 20 moves forward. When the measurement head 20 is pressed against the work 22 with a constant pressure, the control device 13 reads the displacement amount of the linear gauge sensor 21 and calculates the bending angle error of the work 22. That is,
As shown in FIG. 6, the angular error α is calculated from the variable position δ of the linear gauge sensor 21 and the reference length L by the following equation.

α = tan ^-1 (δ / L) At this time, the linear gauge sensor 21 is reset in advance by the reset gauge 27 that can be retracted by the cylinder 26 attached to the plate 28 installed on the block 18. The bending angle is set to a predetermined bending angle at the variable position α = 0.

The measured bending angle error α is compared with a reference value in the controller 13 to determine whether it is within the tolerance. If it is out of the tolerance, as shown in FIG. 8, the material characteristic data (initial data) in consideration of the spring back of the work 22 which has been measured in advance is corrected by the angle error α, that is, the wing type 24 Pre-set data B
The line of the initial data is moved in parallel to the actual bending angle A ', the command value B'of the wing die 24 for obtaining the specified bending angle A is obtained from the corrected data, and the re-bending process is performed with the command value B'. To do.

By repeating this operation, each side can be bent with high accuracy.

Further, in this apparatus, by selecting whether or not to input the measurement start command, it is possible to perform high speed machining without measurement correction.

Further, the idea of the present device can be applied to a general-purpose folding machine having no equipment such as the front table 29.

Further, if the relationship between the work bending angle and the wing type command value is measured in advance for various materials, flexible and highly accurate machining of various materials becomes possible.

〔The invention's effect〕

According to the present invention, the bending angle of the work can be automatically measured on the machine, and this data can be feedback-controlled online to the operation of the bending mechanism (the swing angle of the wing type). Highly accurate bending can be performed regardless of changes.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a three-dimensional view showing an embodiment of the present invention, FIG. 2 is a side view showing a measuring device, FIG. 3 is a side view showing a bending method, and FIG. Is a cross-sectional view showing the method of angle measurement, FIG. 5 is a side view showing the angle reset mechanism, FIG. 6 is a side view showing the theory of angle measurement, FIG. 7 is a flow chart showing the procedure of angle measurement, and FIG. The figure is a graph showing an angle correction method. 1 ... Bending device, 10 ... Stopper, 13 ... Control device,
22 …… Workpiece, 24 …… Wing type, 25 …… Clamp type,
29 …… Front table, 30 …… Measuring device.

Claims (1)

[Claims] 1. A front table for positioning and transporting a workpiece in the longitudinal direction, a stopper for positioning and transporting the workpiece in the short side direction, a clamp die for clamping the workpiece, and a wing for folding the workpiece. In a bending device including a mold, an angle measuring unit that measures a bending angle of the work, and a control unit that controls each device,
When the bending angle of the work is input to the control means, a bending angle error is calculated and compared with a reference value, and when a predetermined value is exceeded, a relationship between the work bending angle and a command value that determines the angle of the wing mold is determined. A bending apparatus comprising means for correcting material characteristic data measured in advance for various materials by an amount corresponding to the bending angle error, and outputting a corrected wing type command value based on the corrected material characteristic data.