JPS59113932A - Material supporting device of press brake - Google Patents

Abstract

PURPOSE:To follow up rotation of a plate with high accuracy by detecting the angle of rotation of the second rotating mechanism that rotates in conformity to the rotation of the plate and controlling the first rotating mechanism according to the difference of angle of rotation between the second mechanism and the first rotating mechanism. CONSTITUTION:A plate 1 is bent by the upper die 4 of a press brake. The plate 1 starts rotation around the shoulder 9 of a lower die 3, and inputs the change of rotation pulse of the second shaft encoder 20 to a controlling device. The controlling device judges starting of rotation of the plate 1 by the change of inputted pulse, and drives a motor 15 at a speed according to a command pulse programmed beforehand. Further, it rotates a supporting member 11 concentrically with rotation of the plate 1 through the first rotating mechanism 12. The controlling device calculates the change of angle of rotation of the plate 1 and generates a command pulse proportional to the rotational position and the speed of the plate 1. The angle of rotation of a driving shaft 13 is detected by the first shaft encoder and the rotational pulse is inputted to the controlling device. Here, the motor 15 is driven in proportion to the difference between rotation pulses of the command pulse and an encoder.

Description

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

(1) The material support device of a conventional press brake is constructed as shown in the first plate and FIG. That is, the plate material is) positioned with respect to the lower die 13 of the press brake on the support table (2), and the ram (not shown) of the press brake is lowered, as shown in FIG. The upper die (4) of the press brake descends and separates from the plate material (υ starts to curve, limit switch +5) Fi plate material).

When the switch (5) is released, the hydraulic cylinder (6) is activated and the support table (2), which is supported by the one-rotation mechanism (7), is connected to the lower mold of the press brake against the main body (8). It rotates around the entire center of the rotation center (9) of the shoulder (3) as shown by the two-dot chain line, and the quick switch (5) comes into contact with the plate material (1) again and stops. As a result of the above operation, the general support table (2) always follows Itamurayama behind. Also, just before the upper part of the press brake m144 comes into contact with the plate material 11), the magnet noise moves and the plate material fllFi
It is held on a support table (2).

In the conventional press brake material support device as described above, there is always a large follow-up delay, so the ram speed of the spray brake (2) must be kept at a completely low speed.

In addition, in the case of a flat plate with a large notch or a plate whose side surfaces have already been bent when bending a single box, if there is a delay in following the support table, the inertia of the plate due to its own weight during bending will increase.

When bending due to the resultant force of the magnet's attraction force, the stress exceeds the elastic limit, causing plastic deformation, so-called buckling.

Therefore, there is a drawback that it can only be applied to flat plates where the above-mentioned problems do not occur even if there is a slight follow-up delay.

Jin's invention was made to eliminate the above-mentioned drawbacks, and includes a second rotation mechanism that rotates in accordance with the rotation of the plate;
A follow-up sensor having a second detector that detects the rotation angle of the second rotation mechanism is provided, and an output corresponding to the difference between the rotation angle of the first rotation mechanism and the rotation angle of the second rotation mechanism is fed back to the first rotation mechanism. The object of the present invention is to obtain a material support device for a press brake that can follow the rotation of a plate material to a high degree of N by controlling the first rotation mechanism using the first rotating mechanism. .

This invention will be explained below using nine drawings.

(3) FIGS. 3 to 5 are a front view, a plan view, and a side view showing an embodiment of the present invention, respectively, and FIG. 6 is a sectional view taken along the line W-Vl in FIG. 5 11C. In the figure, till is a support member, and is a 1.1 rotation mechanism that supports the f121/ri support member aIJ so as to rotate around the entire center of the shoulder (9) of the lower die (3) of the press brake. 1st rotation mechanism (Le)
A first gear wheel (16) is fixed to the drive shaft 1131 as a super-working part that drives the support member mouth 1), and a second gear (16) is attached to the shaft of the motor rotor 5) that controls the rotation of the support member mouth 1). Between 141 and 061, a toothed pel 1171 is provided to fully drive the drive shaft 113+. In addition, the drive shaft + I31 vctri first rotation mechanism (120 first detector that detects the rotation angle, 1!/I!1 is provided with the first shaft encoder a) (191 is the drive shaft port 3). is a second rotation mechanism that can rotate independently.120
+ is the second rotation mechanism (the second detector 1, for example, the second shaft encoder, which detects the rotation angle of 19 through the third gear 1 and the fourth gear 122+, closed) is the second rotation mechanism 09
It is a follow-up member that can be attached to and follow the plate (υ) by means of a magnet, etc., which is fixed opposite the plate (11).

(4) Second rotation mechanism 1191. 2nd shaft encoder tal
+ and the following member (2) constitute a following sensor +25).

(2) is the main body holding the first rotation mechanism [12+ and motor A, and the second shaft encoder is attached to the main body (E) with a talli mounting bracket (2). Drive shaft 1
131 is provided with a bearing (to) that fully supports this.

Next, the operation of this embodiment of the invention constructed as described above will be explained. The method for starting and driving the rotation of the support member till is as follows. After positioning the plate (1), when the ram of the press brake is lowered, the plate is bent by the upper die (4) of the press brake.

At this time, Itadoriyama is placed on the shoulder (9) of the lower die (3) of the press brake.
It starts rotating around , and the start of this rotation, that is, the change in the rotation pulse of the second shaft encoder (4)).

It is input to the control device (2) of the control circuit as shown in the off-line diagram. Depending on the change in the input pulse, the control device (2!I) determines the start of the rotation of the plate pile, and then starts the motor t151'k at a speed according to the programmed command pulse.
/1llK moves.

When the motor a9 is driven, the second firJ1t (1G+
, a toothed bell (5 teeth aη), and the drive shaft [131 rotates via the first gear 1141.

Furthermore, the support member 1ull is transferred via the first rotation mechanism t121.
is driven to rotate concentrically with the rotation of the plate pile. In addition, the plate material
A method of controlling the rotation of the support member Qll with respect to the rotation of the support member Qll has the following prior invention.

The change in the rotation angle of the plate pile at the shoulder (9) of the lower die 13) of the press brake corresponds to the ram speed of the press brake.

The material of the plate material (work hardening index), the width of the lower die (3) of the press brake, and the cross-sectional shape of the plate material (for example, whether it is a flat plate or U-shaped) are determined by the analytical formula of Rikishima bending.

Therefore, the control device 1291 calculates the change in the rotation angle of the plate material (1) and generates a command pulse proportional to the rotational position and speed of the plate material (1). Furthermore, the rotation angle of the drive shaft (131) is detected by the 21 shaft encoder u8I and the rotation pulse is input to the control device (■).Here, the command pulse and the first
By driving the motor (151) in proportion to the difference in the rotation pulses of the shaft encoder f181, control is performed so that the rotation of the plate material 11 whose # is calculated by calculation coincides with the rotation of the detected support member [111]. The details of this control are explained in the patent application M (Japanese Patent Application No. 57-152'l'12, ``Material Support Device for Press Brake'', dated September 2(6), 1982, filed by the same applicant).

In addition to the method of the prior invention described above, the control method of this invention includes a follow-up sensor + 2! The rotation pulse of the second shaft encoder mowing provided at il, that is, the signal of the actual rotation angle in the plate material, is input to the control device, and the command pulse and the rotation pulse of the second shaft encoder mowing, which are calculated by the calculation described in the prior invention, are input. The motor 1151 is configured to be driven in proportion to the difference. Due to this control method, this occurs due to fluctuations in the ram speed of the press brake, fluctuations in the material of the plate, etc. The plate material can correct the difference between the rotation angle calculated by # and the actual rotation angle, that is, the follow-up delay, and the follow-up error becomes very small.Moreover, it is the same as the driving method based on the #t' calculation value VC. As a result, it can be used in any shape of plate material.

In the above example, a command pulse proportional to the rotation in the plate material determined by # calculation was generated, and the rotation speed of the support member (Ill) was controlled to almost match the rotation speed of the actual plate material (1). However, #12 Murayama's maximum speed or 7C is C7) Even if all command pulses with a constant frequency proportional to the faster speed are generated, the support member u]J/l'i will follow the plate material pile without delay. be able to.

In addition, as another example, instead of the specified pulse proportional to the rotation in the plate obtained from the analytical formula for one bend, a rotation pulse of the follow-up sensor is used as a command pulse, and the support f! B kidnapping
The motor 1151'f! outputs an output proportional to the difference in the rotation angle of the first shaft encoder, which is the rotation angle of ill, so that the support member full is aligned with the inside of the plate. : Even if controlled, high tracking of 8 degrees can be achieved.

Furthermore, we have shown a method for following the rotation of the following sensor (1251t) in the board by using a magnet (1251t) to attach it to the pile of the board. ) may be configured so that it is always pressed with such force that it does not cause it to rise.

As mentioned above, as a material support device for press brakes,
A support member that supports the plate material, a first rotation mechanism that supports the support part so as to rotate around the shoulder of the lower mold of the hammering press brake and has a drive section, and detects the rotation angle of the first (8) rotation mechanism. a second rotation mechanism that can rotate independently of the first rotation mechanism and rotates in accordance with the rotation of the plate; and a second rotation mechanism that detects the rotation angle of the second rotation mechanism.
Tracking sensor with detector.

A control device is provided that controls the first rotation mechanism by feeding back an output corresponding to the difference between the rotation angle of the first rotation mechanism and the rotation angle of the second rotation mechanism to the drive unit of the first rotation mechanism. It is possible to follow the rotation of the plate material with high precision.
This has the effect of making it possible to automatically bend plates of various shapes.

[Brief explanation of the drawing]

1 and 2 are side views showing an example of a conventional press brake material support device, and FIGS. 3, 4, and 5 are a front view and a plan view showing an embodiment of the present invention, respectively. , and a side view, FIG. 6 is a sectional view taken along the line %'l-W in FIG.
The figure is a control circuit diagram showing another embodiment of the invention. In the figure, (1) is a plate material, IE is a support member, and O2
I is the first rotating mechanism, [131 is the drive shaft, (14+ is the first gear, u5; is the mo (9) one, +161 is the second gear, +171 is the toothed belt, (181 is the first detector, 1191Fi second rotation mechanism, ■ is the second detector, f21+ is the third gear, 122
+ is the 4th gear, (to) is the tracking sensor. ■ indicates a control device. In Figure 9, the same reference numerals indicate the same or similar parts. Agent Shin Kuzuno - (10) Figure 1 Figure 2 Figure 3 Figure 5 Figure 7 Figure 8

Claims (1)

[Scope of Claims] A support member that supports a plate material, a first rotation mechanism that supports this support part so as to rotate around the shoulder of a lower die of a hammer press brake, and has a drive section, and a first rotation mechanism of this first rotation mechanism. A first detector that detects the rotation angle, a second rotation mechanism that can rotate independently of the first rotation mechanism and rotates in accordance with the rotation of the plate material, and a second detector that detects the rotation angle of the second rotation mechanism. A tracking sensor with a control device that controls the first rotation mechanism by feeding back an output corresponding to the difference between the rotation angle of the first rotation mechanism and the rotation angle of the second rotation mechanism to the drive unit of the '3+1 rotation mechanism; Brake material support device.