JPS59141323A - Material supporting device for press brake - Google Patents

Abstract

PURPOSE:To enable automation of plate bending into various shapes by providing a detector which detects the force received by a supporting member from a plate material and controlling a rotating mechanism in such a way as to drive said mechanism when the output of said detector decrease to a prescribed value or below and to stop the mechanism when the output increases above a prescribed value. CONSTITUTION:A supporting member 11 which supports a plate material 10, a rotating mechanism 2 which supports said member in a way as to rotate the same around the shoulder 15 of the bottom die of a press brake and a detector 19 which detects the force received by the member 11 from the material 10 are provided. A control device controls the rotating mechanism 2 so as to drive said mechanism when the output from the detector 19 decreases to a prescribed value or below and to stop the mechanism 2 when the output from the detector 19 increases above a prescribed value. The material supporting device of the press brake which obviates the delay in follow up of the member 11 to the plate 11 is thus obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a material support device for a press brake that supports the entire plate by following the rotation of the plate due to bending.

As a conventional press brake material support device, there is one shown in FIG. 1 and W2. In the figure, (1) is a support member 1, for example, a support table, (21 is a support table (1)
) is supported by a hydraulic cylinder (3) attached to the
Pull (1) to the bottom of the press brake (4) scraps i5)
f;! : Supported so as to rotate around the center 7,) lr!
It is a j-rotation mechanism. A beam tip (6) and a magnet (7) are provided on the support table (1).

(8) is the main body that holds the spindle daple and the like.

The material support device of the conventional press brake is used to hold the plate 110 on the support table (1) under the press brake 2 (q (
When the press brake ram (not shown) is lowered, the press brake upper die (9) lowers and the plate material 0υ begins to bend, as shown in Figure 2, and the limit switch (6 ) is plate material f! 1 and leave. The hydraulic cylinder (3) is activated by the signal that the limit switch (6) is released.
The support table (1) supported by the one-rotation mechanism (2) rotates with respect to the main body (8) around the rotation center (5) as shown by the two-dot chain line, and the limit switch ( 6) comes into contact with the plate material direction and stops. By repeating the above operations, the support table (1) follows the busy plate 0υ with a delay. In addition, the magnet (7) starts working immediately before the press brake upper die (9) comes into contact with the plate material no+.
The plate Oo) is held on the support table (11).

The material support device of a conventional press flake has the structure described above, so in addition to using a detector with a large operating error such as a limit switch, it also detects the point at which the plate material leaves the material support device. Since the support device is rotated, there is always a large follow-up delay. For this reason, the ram speed of the press flake had to be reduced. f
For plates that have already been bent, such as when bending a flat plate with a large notch or a box, if there is a delay in following the support table, the weight of the plate will increase.

The bending stress due to the resultant force of the inertial force during bending and the adsorption force of the machinette exceeds the elastic limit, causing plastic deformation, so-called buckling. For this reason, there was a drawback that it could only be applied to flat plates.

This invention was made in order to eliminate the drawbacks of the conventional ones such as "J:Fit".
[When the value decreases below the fixed value, the rotating machine +:rf is driven l~,
When the upstream output increases above a predetermined value, control is performed to stop the upper dC rotary machine 忰°i! ti control device (+
It is an object of the present invention to provide a press brake material support device that can follow the rotation of a plate material with a high M jJK and can be used for any shape of plate material.

This invention will be explained below using nine drawings. Figures 3 and 4
The figures are a front view and a plan view, respectively, showing one embodiment of the present invention. +ill is the support member 9 (21 is the support member (
This is a rotating mechanism that supports Ill to rotate around the scraps 5) of the lower mold of the press flake. Rotating mechanism (2)
The drive section +1 that drives the is composed of the following elements. That is, the drive shaft 1131 is supported by a bearing (11), one gear is fixed to the drive shaft 13), and a gear (one is fixed to the shaft of the motor t11 that controls the rotation of the support member αυ).
17) is attached. A toothed belt (1'3) is provided between both gears 11''9 and 19 so as to fully drive the drive shaft (1'5).
10 is a detector that detects the force received from 1, for example, the drive shaft (
It is a strain cage attached to 13, in this case, it detects the torsional torque generated on the drive shaft θj by the plate material (11). Figure 5 is an overall configuration diagram showing one embodiment of the present invention. !2tffi is a strain amplifier that amplifies the entire output of the strain cage H connected to the drive shaft (13), and the output amplified by this strain amplifier is input to the control device C+t+, and the control device 12
The position is corrected by the correction means @ in υ, and is fed back to the motor via the servo amplifier t23ff.

Next, a detailed explanation will be given of this invention configured as follows. The Ak material ill is positioned and placed on the lower die (4) of the press brake and the support member αD. At this time, I.J.
4/l movement 11'llll (At 1'31, torsional torque is generated due to the weight of the plate material, and an output is generated at the strain gauge Q value. This output is f!r, J + '5 semi-output, and in this state, the motor ( 1. Set the command so that the current is zero.

The phase current at this time is from the control device (2υ) to the motor (1υ).
5 Refers to the current required for full drive. Next, when the ram (not shown) of the press brake is lowered, the plate material (10) is bent by the upper die (9) of the press flake and begins to rotate around the shoulder (5) of the lower die of the press flake. (lυ
begins to bend, and the supporting member aIl of the plate material 00) is
-, when the reaction force decreases, the torsional torque applied to the drive shaft +11 decreases. For this reason, the output of the strain cage 01 vehicle decreases even more than the reference value, and this output is amplified by the rain amplifier (to) and input to the control device Nt21). Since the torque generated by the weight of the plate material (lυ) changes depending on the rotational position of the plate material (1α) and the support member u9, the control device C?
The correction means (23) in υ performs position correction and sends a command current to the motor (++19) via the servo amplifier J. When the motor fl19 is driven by the command current, the gear (151 The drive shaft l+ (8) rotates through the 1φ transmission mechanism (2), and the support member 11+ is driven to rotate concentrically and in the same direction as the rotation of the waste material (io). Ri (IJ) is kidnapped (1
When it catches up with the first rotation of 0) and the Q-slip torque becomes equal to the initial reference value, the command current to the motor 16) becomes zero, and the drive of the motor (13) is stopped. By repeating the above operations, one bending force i' is applied to the plate material 1. t
Detecting the torsional torque change of the drive shaft (1) due to the rotational movement of They follow the thieves.

Therefore, there is almost no follow-up delay, and it can be applied to bending that requires high-precision follow-up, such as single-box bending. On the contrary, when the support member 0υ is a plate material (10), it can be detected very well even when it is pushed too far.

In the above embodiment, a strain gauge (11 odd) was used to detect the force, and the change in the shaft torque of the drive 11+a:++ was detected, but a load sensor was provided on the support member 11υ to detect the reaction force from the bending of the plate material. The same effect can be obtained even if this is done.Furthermore, if a force is applied in advance to the plate material tl (W to the extent that it does not cause deformation) by the support member <11 in the initial setting, the tracking can be performed with even higher accuracy than in the above embodiment. Furthermore, if the support %i1) material 6D' is rotationally driven according to the bending analytical formula proposed by the authors as a prior invention, and the control (Ill) according to the present invention is also performed, in addition to the above embodiment, the thread The stability of T1. Since the current IAr changes depending on the load applied to the support member U, the rotation of the support member (Lυ may be controlled 1111) by detecting the change in the drive current using, for example, a comparator.

As described above, according to the present invention, there is provided a support member for supporting a plate material, a rotation mechanism having a driving section for rotating the support member around the shoulder of the lower die of the breath brake, and a rotating mechanism for supporting the support member to rotate around the shoulder of the lower die of the breath brake. A detector detects the force received from the plate material, and the output from the detector is fed back to the drive unit (-, when the force decreases below a predetermined value, the rotation mechanism is driven, and the force decreases from the predetermined candy. -F when it increases
By providing a control device that controls the rotation mechanism so as to stop the rotation mechanism, it is possible to provide a material support device for a breath brake in which the delay in following the support member with respect to the plate material is negligible. This makes it possible to visualize the bending process of plates in the shape of , and the labor-saving effect of this implementation is significant.

[Brief explanation of the drawing]

FIGS. 1 and 2 are front views showing a conventional material support device for Breath Spray II, and FIGS. 3 and 4 are front views and plan views showing an embodiment of the present invention. FIG. 5 is an overall configuration diagram of an embodiment of the present invention. In the figure, (21i rotation mechanism, (5) the shoulder of the lower die of the unless brake 7, (10 the plate material, anF'i support member,
tl is the drive unit, u3) ~ (110 is the configuration of the drive unit, 11υ is the drive till, ++51. ++71
is a gear, (IO is a motor, and αg is a toothed belt. (
11 is the detector, (2++ is the TFI control device. In Figure 1, the concave symbol indicates the same 7 or the opposite part. Representative Shin Kuzuno - Figure 1 Figure 2 ・J Figure 3 / 7 E? Figure 4 Figure 5 23 Call
Written amendment to the U procedure (spontaneous) 5j.119, 1980 To the Commissioner of the Patent Office 1 Indication of the case Patent application No. 13965/1982 2
Name of the invention: Press brake material support device 3, Representative of the person making the amendment: Hitoshi Katayama, Department 5 Detailed explanation of the invention in the specification subject to the amendment 6, Contents of the amendment (1) Specification, page 7, No. 3 Correct "motor aS" in the line to "motor Oe". (21, page 8, line 13 of the same, "driving current from" is corrected to "command current to 1-". In addition, it is generally performed with a DC motor.Current open side 1. Controls the command current to always keep it constant.
The same effect can be obtained even if the torque is increased to 1U1. Insert Jf. Above 139-

Claims (1)

[Scope of Claims] (11) A support member that supports a plate material; a rotation mechanism that supports this support member so as to rotate around the shoulder of a lower die of a press brake and has a drive unit; A detector for detecting the applied force, and an output from the detector is fed back to the drive unit, so that when the force decreases below a predetermined value, the rotation mechanism is driven, and when the force increases above the predetermined value, the rotation mechanism is driven. A press brake material support device comprising a control device that controls the rotation mechanism so as to stop the rotation mechanism. (2) The detector is a strain gauge attached to the drive shaft of the rotation mechanism. A press brake material support device according to claim 1. (3) The press brake material according to claim 1 H, wherein the detector is a load sensor attached to a support member. Support device.