JPH10328741A - Light beam type protecting device of bending machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To always keep the function of protection by being composed of, at least, one optical axis among plural numbers of optical axes arranged in the longitudinal direction of a die on a working table so as to move the non- intercepting position corresponding to the shape of a work. SOLUTION: A worker inputs a required information data of a die or a work with an inputting means at first in advance of beginning to process the work, however, in this step, for example, the data of flange shape/dimension, etc., of the work at each working stage is inputted. Or, the work flange shape/ dimension, etc., on each bending stage is obtained automatically with an NC device based on the information of article of an exploded view/elevation view, etc., of the work article. The movement is executed so as to avoid the flange part so that each optical axis of each projector 1, 2 of the light beam type protection device before working is not intercepted with the work flange at the same time. In this moving method, at least, one of two parallel optical axes L1 , L2 is enough moved to the position without being intercepted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light beam type protection device for a bending machine for sheet metal or the like.

[0002]

2. Description of the Related Art For example, in a sheet metal work bending machine such as a press brake, an upper die (punch) and a lower die (die) mounted on a pair of upper and lower tables are placed therebetween. The sheet metal work or the like is pressed from above and below to perform a predetermined bending process.

During this operation, it is dangerous if a foreign body such as a part of a human body or a tool is interposed between the upper and lower molds, such as a hand of an operator. A light emitter is provided in alignment with the other light receiver, and the light emitter is singular or plural (generally two or more).
The parallel light beam of this book is emitted toward the light receiver, and when these optical axes are interrupted, for example, when interrupted by a part of the human body or the like, the presence of foreign matter is recognized and the table is driven immediately. Conventionally, a light beam type protection device using a semiconductor laser beam to stop the operation of the ram is used.

However, when a single optical axis is used, for example, as shown in FIG. 8, when a work W has a flange, the work W cannot be used because it is cut off and cannot be machined. 2 to solve such problems
A protection device of the type that uses two parallel optical axes and stops driving the table only when the parallel optical axes are simultaneously cut off has been put into practical use.

[0005]

However, in the above-mentioned conventional double beam type protective device, depending on, for example, the shape and dimensions of the flange of the work to be processed, the protective device may be provided before a predetermined bending process. In some cases, a plurality of optical axes may be interrupted. In this case, since this type of conventional light beam type protection device cannot be used, there is no means for ensuring the safety of workability. It was dangerous.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide means for allowing a light beam type protection device to function effectively for various work shapes.

[0007]

Therefore, in the present invention, the above object is achieved by providing a light beam type protection device for a bending machine according to any one of the following items (1) and (2). What we are trying to achieve.

(1) In a plurality of parallel optical axis type protection devices disposed on a processing table in a mold length direction, at least one of the plurality of optical axes is in a non-blocking position in accordance with the shape of a workpiece to be processed. A beam-type protection device for a bending machine, wherein the beam-type protection device is configured to be movable.

(2) The bending according to claim 1, wherein the plurality of parallel optical axes are two parallel optical axes of laser light, and the moving direction of the at least one optical axis is a vertical direction. Beam protection device for processing machinery.

[0010]

According to the structure of the present invention as described above, the work to be processed is not affected by, for example, the shape and dimensions of the flange.
The protection function of the human body or the like can be always maintained by the light beam method.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be described below in detail based on an embodiment.

[0012]

【Example】

(Structure) FIG. 1 is a three-view diagram showing a schematic structure of a light-emitting side of an embodiment of a laser beam protection device according to the present invention, and FIG.

FIGS. 1 and 2 are schematic explanatory views of a protection device provided on a lower table side provided with a lower die (die) D of a press brake on a semiconductor laser beam projecting side. The position moving mechanism on the side of each light receiver (laser light sensor) with respect to each of the light projectors 1 and 2 has the same configuration as that in FIG.

In FIGS. 1 and 2, X, Y, and Z indicate coordinate axes of the left and right, front and rear, and height directions of the press brake, respectively, CL indicates the center line of the upper / lower table, and P / D indicates the punch / die, respectively. , 1/2 each have a laser beam axis 1/2 L ₁ / L ₂ parallel to each other.
Reference numeral 3 denotes an abutment for regulating a processing position of the sheet metal work W having a flange.

The feature of the embodiment of the present invention is that the position of the optical axis of each projector 1/2 is controlled by a screw 5 for driving each motor 4.
The configuration is such that the height position in the Z direction can be changed in coordination with the light receiver side (not shown) and the optical axis.

(Optical Axis Variable Position Control System) FIG. 3 is a block diagram showing the configuration of the above-described variable optical axis L ₁ , L ₂ position control system.

Numeral 10 denotes input means for changing the optical axis position such as the shape of the die and the flange shape of the workpiece W, dimensions, and the like. Numeral 11 denotes N as optical axis position calculating means in each step of the workpiece bending process.
C device and 12/13 denote the optical axis position changing drive means of each light emitter / receiver.

Prior to starting the processing of the workpiece W, the operator first inputs necessary information data such as a die and a workpiece to the input means 10. At this stage, for example, the flange of the workpiece W in each processing step is input. Input data such as shape / dimension.

Further, based on the product information such as the development view / three-dimensional view information of the work product, the NC device 11 automatically obtains the work flange shape / size in each bending process.

Based on the shape and dimensions of the work flange in each of the above bending steps, the respective optical axes of the light projectors 1 and 2 of the light beam protection device before the start of working are prevented from being simultaneously blocked by the work flange. , Move to avoid the flange portion.

This moving method is based on two parallel optical axes L ₁ ,
At least the L ₂ may be moved to a position where one is not blocked. An example is shown in FIG.

Each of the light emitters 1 and 2 and the corresponding light receiver are provided with the N
Based on the movement command from the C device 11, the optical axis is synchronously moved in synchronization. In this state, the bending of the work W is started, and when it is detected that both optical axes L ₁ and L ₂ are simultaneously cut off by some cause, for example, a hand of a worker or a work process, the table driving ram is started. Emergency stop of the hydraulic pump / motor to ensure safety.

FIG. 5 shows a flowchart of the above-described machining operation sequence. In the flowchart of FIG. 5, first, before starting machining, an operator inputs necessary machining data (for example, mold, work information, etc.) in step S1, and at this stage, a work flange shape in each machining process is determined. Input in step S2. Alternatively, based on the work product information (for example, development view, three-dimensional shape information, etc.), the NC device 11 may automatically obtain and input the work flange shape / dimension in each bending process.

Based on the flange shape in each bending step described above, a plurality of light beams (optical axes) L _{1 and} L ₂ of each of the light projectors 1 and 2 of the light beam protection device before the start of bending is simultaneously blocked by the work flange. The process is examined in step S3 so as not to occur, and if there is no interference, the process jumps to step S5 to start machining.

On the other hand, in step S3, both optical axes L
_1, when L ₂ interferes with all workpiece flange, the process proceeds to step S4, as shown the exemplary diagram in FIG. 4, at least one of its optical axis (illustrated example is the optical axis 2 L ₂₎ Move to a position where does not interfere.

The light projector and the light receiver of the designated optical axis L ₂ are moved so that the optical axis L ₂ is synchronized with the movement command from the NC unit 11.
₂ is outside the cutoff flange (one of the flanges in Fig. 5)
Move to

In this state, in step S5, bending of the work is started, and during this work, both optical axes L ₁ ,
The L ₂ What like or causes (eg operator's hand or the working tool or the like), and stops the hydraulic pump / motor and the like of the ram drive when it is cut off at the same time, the body of the ram descends and emergency stop The protection function is realized, but when it is normal, the process proceeds to step S8 to operate to end the processing.

FIGS. 6 (a) to 6 (d) show the four movements of the optical axis.
The figure shows an example: (a) The figure shows an example of a normal optical axis arrangement in which both optical axes L ₁ and L ₂ are not interrupted at the same time. to that blocks L _2, shows a diagram example of the optical axis L ₁ was possible positioned below the first.

FIG. 4B shows that when the punch P descends, both optical axes L
_1, since it is blocked L ₂ both diagrams example of moving the optical axis L ₁ upward.

FIG. 3C is an example in which the position of the optical axis L ₂ is moved downward because the optical axis L ₂ is interrupted when the punch P descends most.

The (d) The figure when the height of the die D has changed from l ₀ to l, for Ryohikarijiku L _1, L ₂ from being cut off, together Ryohikarijiku L _1, L ₂ The example of a figure changed to a rise position is shown.

(Other Embodiments) In the above embodiment, the description has been given of the example in which the laser beam protection device is provided on the lower table side as described above. However, the present invention is limited to this. Instead, for example, FIG. 7 shows an explanatory diagram of a case where a projector and a receiver of this type of protection device are arranged on an upper table.

In this case, the press brake mold is
For towards the punch is the upper mold has a larger change in shape / size, for example according to their respective shapes P _1, P _2, to move the optical axis L _1, L ₂ in position as shown in FIG Example FIG. 1 shows an example of a diagram in which the following can be performed.

[0034]

As described above, according to the present invention,
Since the optical axis position of the movement of the beam type protection device of the bending machine can be changed, a plurality of optical axes are not interrupted at the same time in a regular machining process, for example, due to a flange shape and dimensions of a work. Can be
The protection function can always be maintained.

[Brief description of the drawings]

FIG. 1 is a schematic three-view drawing of a light emitting side of a laser beam type protection device according to an embodiment.

FIG. 2 is an example of an optical axis positional relationship diagram

FIG. 3 is a configuration block diagram of a variable optical axis position control system.

FIG. 4 is a processing operation sequence flowchart.

FIG. 5 is a diagram showing an example of movement of one optical axis.

FIG. 6 is a diagram illustrating an example of movement of an optical axis.

FIG. 7 is an example of the arrangement of an upper table.

FIG. 8 shows an example in which the function cannot be performed in the case of the conventional single optical axis type.

[Explanation of symbols]

1 Emitter 1 2 Emitter 2 3 butting 4 motor 5 screw 10 data input means 11 NC device 12 projector optical axis moving unit 13 light receiver optical axis moving unit P, P _1, P ₂ punch (upper die) D die (lower Mold) L ₁ optical axis 1 L ₂ optical axis 2 W Work

Claims (2)

[Claims] 1. A plurality of parallel optical axis type protection devices disposed on a processing table in a mold length direction, wherein at least one of the plurality of optical axes is set to a non-blocking position according to a shape of a workpiece to be processed. A light beam type protection device for a bending machine, which is configured to be movable. 2. The bending process according to claim 1, wherein the plurality of parallel optical axes are two parallel optical axes of the laser beam, and the moving direction of the at least one optical axis is a vertical direction. Beam protection device of machine.