JPS61232018A - Bending device - Google Patents

Abstract

PURPOSE:To perform a bending of a prescribed angle with one process of bending work, by automatically measuring a bending angle of work on a machine and by feed-back controlling the data on line for the motion (rotating angle of wing pattern) of bending mechanism. CONSTITUTION:A work 22 set in a clamp pattern 25 and a base 2 is bent by means of the rotation of a wing pattern 24 by a cylinder 23. After the wing pattern 24 reached a predetermined wing angle, and after it returned to an original condition, a measuring head 20 advances, and a bending angle error alphais calculated by a controlling device, and the angle error alpha is calculated comparing with standard value so as to give decision on whether or not it is within the allowance. If it is found to be outside of the allowance, the characteristic data on the material considering spring back etc. of the work 22 etc. is modified by the angle error alpha and the bending work is performed again at the commanded value of bending angle for the wing pattern 24 obtained from modified data.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a bending device for bending steel plates and the like, and particularly to a bending device suitable for obtaining a highly accurate bending angle.

[Background of the invention]

Conventional bending equipment, such as that shown in Japanese Patent Application Laid-open No. 57-41826, combines a digital table, a rotary table, a centering device, and a bending machine body to automate the conveyance and bending of the workpiece. The zero bending width dimension and angle are each automatically controlled by a control device.

However, the bending angle, in particular, has large variations between lots due to material characteristics such as springback of the workpiece, so it must be prepared in advance.

When bending according to (programmed) data, it was difficult to achieve a predetermined angle in - turns.

Therefore, trial bending is performed for each different lot of workpieces, and the optimal bending conditions are selected through trial and error. In addition, this test bending process requires repeating angle measurement, data correction, and reprocessing after the bending process, which is a bottleneck in automation as it relies entirely on human hands. Furthermore, test-bent products often cannot be used as products due to poor angle, which has been a problem.

[Purpose of the invention]

An object of the present invention is to provide a bending device that can always bend a workpiece to a predetermined angle in one bending process even if there are variations in the material properties of the workpiece.

[Summary of the invention]

The present invention uses a measuring device installed in a bending device to
Automatically measures the bending angle of the workpiece, compares and calculates this data with basic material property data obtained in advance, and corrects the bending angle (wing-shaped angle) of the workpiece by the bending device. By performing the bending process using the correction value, even if there is variation between lots of workpieces, the
The idea is to perform bending at a predetermined angle in one bending process.

[Embodiments of the 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. This cylinder 3 has a base 2 and a column 1 as a driving source.
The ram 5 moves up and down guided by the support 4 installed between the rams 6 and 6. A clamp mold 25 is installed on this ram 5 as shown in FIG. Further, a cylinder 23 is fixed to the base 2 as shown in FIG. This cylinder 23 causes the wing mold 24 to perform a wing motion using the backup 15 as a guide, as shown in FIG. In addition, this backup 15 is fixed to the base 2, and the ram 5
It has a structure that allows it to slide.

Further, a front table 29 is mounted on the base 7, and a front table 29 is set with a drive belt 8 for conveying and positioning the workpiece 22 in the longitudinal direction as shown in FIG. The workpiece 22 is positioned and transported by a stopper 10 that moves in the front-rear direction and a turning device 12 that turns the workpiece 22 using a cylinder 11.

Also, the backup 15 includes a bar 17 as shown in FIG.
is installed. A block 18 is installed on this bar 17, and a measurement head 20 is provided to slide on this block 18 as a guide. This measuring head 20 uses a cylinder 19 as a driving source, and a linear gauge sensor 21 is set therein.

In this way, the bar 17, the block 18, and the cylinder 1
9, the measuring head 20, and the linear gauge sensor 21 constitute a measuring device 30.

These series of devices are under integrated control by a control device 13.

First, the workpiece 22 is conveyed and positioned to a predetermined position in the longitudinal direction by the drive belt 8.
As a result, it is inserted into the clamp mold 25 and the base 2 and positioned so as to have a predetermined bending width. The set workpiece 22 is firmly held by the cylinder 3, the clamp mold 25, and the base 2. When the workpiece 22 is clamped, the wing mold 2 is clamped by the cylinder 23 as shown in FIG.
4 performs a wing (swivel motion) and bends the workpiece 22 along the bending line of the clamp die 25. At this time, the wing die 24 measures the wing angle with an encoder (not shown), and When the angle set in the control device 13 is reached, the cylinder 23 returns it to its original state.

- When the bending of the sides is completed, the Knimp mold 25 rises,
The workpiece 22 is pulled out by the stopper 10, and the other side of the workpiece 22 is indexed by the turning bag W112.
The folding process is carried out in the same manner, and when the entire process is completed, the drive belt 8 carries out the bending process.

At this time, when a measurement start signal is issued in response to a command from the control device 13, the wing mold 24 reaches the preset wing angle, returns to its original state by the cylinder 23, and then starts measurement by the cylinder 19. Head 20 moves forward. When the measurement head 20 is pressed against the workpiece 22 with a constant pressure, the control bag fl! 13 reads the displacement amount of the linear gauge sensor 21 and calculates the bending angle error of the workpiece 22. That is, as shown in FIG. 6, the angular error α is calculated from the displacement amount δ of the linear gauge sensor 21 and the reference length L using the following equation.

α=tan-1(δ/L) Also, at this time, the linear gauge sensor 21
It is reset in advance by a reset gauge 27 that is retractably equipped with a cylinder 26 attached to a plate 28 installed at 8, and is set so that a predetermined bending angle is obtained at the displacement position α=O.

The measured bending angle error α is compared with a reference value within the control device 13 to determine whether it is within the tolerance. If it is outside the tolerance, as shown in Figure 8, the material property data (initial data) that takes into account the springback of the workpiece 22 that has been measured in advance is corrected by the angular error α.
That is, the line of initial data is translated in parallel to the preset data B of the wing mold 24 and the actual bending angle A', and the command value B' of the wing mold 24 is calculated to obtain the specified bending angle A from the corrected data. is determined and the re-bending process is performed using the command value B'.

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

Furthermore, with this device, high-speed machining can be performed without measurement correction by selecting whether or not to input a measurement start command.

Further, the idea of the present device can also be applied to a general-purpose bending machine without equipment such as a front table 29.

Furthermore, by measuring the relationship between the workpiece bending angle and the wing type command value for various materials in advance, flexible and high-precision machining of various materials becomes possible.

[Effects of the Invention] According to the present invention, the bending angle of the workpiece can be automatically measured on the machine, and this data can be feedback-controlled online to the operation of the bending mechanism (wing-type turning angle). High-precision bending can be performed regardless of changes in material lots, etc.

[Brief explanation of drawings]

Fig. 1 is a three-dimensional view showing one embodiment of the present invention, Fig. 2 is a side view showing the measuring device, Fig. 3 is a side view showing the bending method, and Fig. 4 is the angle measurement method. 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 flowchart showing the angle measurement procedure, and FIG. 8 is a graph showing the angle correction method. It is. 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 that positions and transports the longitudinal direction of bending, a stopper that positions and transports the short side, a clamp type that clamps the workpiece, a wing type that bends the base and workpiece, and a A bending device comprising a measuring device that measures the bending angle of a workpiece, and a control device that controls each of these devices.