JPH08141656A - Method for bending and device therefor - Google Patents

Abstract

PURPOSE: To raise the degree of freedom on working by pushing an over ride button with an operator when the interference is unable to be generated after checking the interference. CONSTITUTION: A bending program inputting means 73 of the bending shape and the flange height, etc., is connected to the CPU 71, and an outputting means 75 to display data is connected also. Further, the min. and max. pressing amount memories 77, 79 to store the min. pressing amount Z and the max. pressing amount X preventing the interference of the work and a plate holding upper die are connected. Further, a 1st discriminant means 81 to compare and discriminate the real Y-axis escape distance Y and the max. pressing amount X respectively is connected. Further, the interference in raising, etc., of the work flange part and the plate holding upper die is discriminated by interference discriminant means 83. If the plate holding upper die interferes with the work flange part due to this means 83, the bending machine is stopped with a stopping means 85. After once stopping, if the interference is unable to be generated after confirming visually with the worker, restarting is executed by a restarting means 87. The stopping means 85 and the restarting means 87 are practised with an over-ride button.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bending apparatus, and more specifically, it presses a work with a plate pressing lower mold and a plate pressing upper mold, and bends the work with the bending mold. TECHNICAL FIELD The present invention relates to a bending method and apparatus for allowing a worker to move a machined work after stopping it without stopping the machine when the work interferes with a plate pressing die.

[0002]

2. Description of the Related Art Conventionally, there has been known an ironing / bending apparatus for bending a work by a bending die while holding the work with a lower plate pressing die and an upper plate pressing die. In the case of this bending apparatus, a manipulator which is provided with a work clamp and is movable back and forth is provided on the front side of the bending apparatus.

For example, as shown in FIG. 6, the work W is clamped by the work clamp 103 of the manipulator 101, and the manipulator 101 is moved to the left side in FIG. The work W is pressed by the die 107, and the work W is bent by a bending die (not shown).

In FIG. 6, the X distance is a distance to be secured as much as possible, the Y distance is a distance to be actually secured, and the Z distance is a distance to be absolutely secured.

Therefore, the control device calculates the Y-axis escape distance (Y distance) between the maximum value (X) and the minimum value (Z) from the work size and the opening size of the work so as to be secured. Then, the data is sent to the NC device. When the minimum value (Z) cannot be secured, a machine stop command is sent.

[0006]

However, a bending error may cause a bending angle to become tight or loose. At this time, even if the Y-axis escape amount can be achieved only by the distance Z or less, the work actually does not interfere with the plate pressing upper die in some cases. At this time, if the machine stops (it becomes an alarm), there is a problem that the degree of freedom of work is low.

An object of the present invention is to perform a bending process in which the operator can move the machine without stopping it when the Y-axis escape distance is equal to or less than the minimum value, thereby increasing the degree of freedom of work. A method and an apparatus therefor are provided.

[0008]

In order to achieve the above object, the bending method of the present invention according to claim 1 is a bending data of a bending shape, a flange height, a bottom dimension and the like of a product and a plate pressing die. A bending program and a machine operation sequence are created based on the machine-specific data of the machine, and Y of the work flange part after each bending process and the plate pressing upper die is created based on the created bending program and machine operation sequence. Detects the axis escape distance and determines whether or not there is interference between the work clamp upper die and the work flange when the work clamp upper die moves up.If there is interference, the folding machine is temporarily stopped and After the operator visually checks the interference, when there is no possibility of interference, the operator presses the override button and the plate presser upper die starts rising. It is.

According to a second aspect of the present invention, there is provided a bending apparatus according to the present invention, wherein a plate pressing lower die provided on the main body frame,
A clamp beam provided with an upper plate pressing die that is pivotally supported by the body frame and that presses a workpiece during bending with the lower plate pressing plate, and a lower plate pressing plate and upper plate pressing die. Bending process composed of a swingable bending die that bends the work while pressing the work with and a manipulator that is provided on the front side of the main body frame and can move back and forth with a work clamp. In the device, the bending shape,
Bending program input means for inputting bending data such as flange height and bottom dimension, and work and plate upper die depending on the work opening dimension and work size after the bending process is completed based on the data from this bending program input means. The minimum push-in amount / memory to calculate and store the minimum push-in amount to prevent the interference, and the Y-axis escape distance when the manipulator is moved to the main body frame and the minimum push-in amount / memory are stored. The interference amount determining means for determining whether or not the Y-axis escape distance is greater than or equal to the minimum displacement amount by taking in the minimum pressing amount, and when the plate pressing upper die interferes with the work flange part by this interference determining means. Stopping means to temporarily stop the folding machine and after a momentary stop, restart the folding machine after visual confirmation by the operator And activation means and is characterized in that it comprises an.

[0010]

With the bending method and the apparatus therefor according to claims 1 and 2, the work clamped by the work clamp is carried in and positioned by moving the manipulator to the bending apparatus. The workpiece, which has been carried in and positioned, is pressed by the plate pressing lower mold and the plate pressing upper mold, and bending work is performed by the bending mold.

The manipulator is moved to the bending apparatus, and the Y-axis escape distance is successively taken into the interference determination means. The interference determining means stores the minimum pushing amount and the minimum pushing amount temporarily stored in the memory, and therefore the interference determining means compares and discriminates the actual Y-axis escape distance and the minimum pushing amount. When it is determined that the actual Y-axis escape distance is smaller than the minimum pushing amount, the bending device is temporarily stopped by the stop means.

In this state, the operator visually checks the interference, and when there is no possibility of interference, the operator pushes the restarting means to start the lifting of the plate pressing upper die.

Therefore, even when the flange portion of the work interferes with the plate pressing upper mold, the operator can move the plate pressing upper mold without stopping the machine, and the work flexibility is increased. It will be.

[0014]

Embodiments of the present invention will be described below in detail with reference to the drawings.

Since the ironing and bending apparatus as a bending apparatus is already known, a detailed description will be omitted and only a schematic description will be given.

Referring to FIG. 5, for example, an ironing and bending machine 1 and an ironing and bending machine 3 as a bending machine.
Further, the ironing and bending machine 3 is provided with a manipulator 5 for supplying the work W. The ironing and bending machine 3 includes a main body frame 7, and a plate pressing lower mold 9 is fixed to an upper portion of the front portion (right portion in FIG. 5) of the main body frame 7.

At the upper part of the rear part (left part in FIG. 5) of the main body frame 7, the lower end of the rear part of the clamp beam 11 is pivotally supported by a pin 13 by an oscillating drive device (not shown). A plate pressing upper die 15 is attached to the lower end of the front portion of the clamp beam 13.

With the above structure, the clamp beam 11 is swung about the pin 13 as a fulcrum, and the work W is pressed by the cooperation of the plate pressing lower mold 9 and the plate pressing upper mold 15.

The body frame 7 and the clamp beam 11
A bending beam 17 which can be rocked by a rocking drive device (not shown) is provided in a space between and, and bending dies 19A and 19B are provided at the tip of the bending beam 17.

With the above structure, when the bending beam 17 is swung upward with respect to the work W pressed by the plate pressing lower mold 9 and the plate pressing upper mold 15, the bending mold 19A performs the normal bending process. When the bending beam 17 is swung downward, the bending die 19B performs reverse bending.

The manipulator 5 is provided with a fixed main body frame 21, and a movable frame 23 which is movable in the Y-axis direction (left and right direction in FIG. 5) which is the front-rear direction with respect to the main body frame 21 is provided. There is. That is, a plurality of guide rails 25 extending in the Y-axis direction are provided on the floor.
Is installed, and this guide rail 25 has L
The moving frame 23 is provided via an M guide 27.

A bracket 29 is fixed on the floor on the right side in FIG.
A Y-axis drive motor 31 is attached to. The Y-axis drive motor 31 has an encoder 33 as position detecting means.
Is provided. Further, a ball screw 35 extending in the Y-axis direction is provided, the left end of the ball screw 35 is rotatably supported by the main body frame 21, and the right end of the ball screw 35 is the output of the Y-axis drive motor 31. It is connected to the shaft. Moreover, the nut member 37 is screwed into the ball screw 35, and the nut member 3
7 is integrated with the moving frame 23.

With the above structure, when the Y-axis drive motor 31 is driven, the ball screw 35 is rotated, so that the moving frame 23 is moved by the guide frame 2 via the nut member 37.
It will be guided in 5 and moved in the Y-axis direction. The moving distance when the moving frame 23 is moved is determined by the encoder 3
Detected in 3.

A lower work clamp 39 is provided on the upper rear portion of the moving frame 23, and connecting frames 41, 43 are provided upright on the front portion of the moving frame 23. A connecting frame 49 integrated with a clamp beam 47 is pivotally supported by a pin 45 on the connecting frame 41 so as to be swingable. An upper work clamp 51 corresponding to the lower work clamp 39 is provided at the lower rear portion of the clamp beam 47.

A lower part of a link arm 55 is pivotally supported on the connecting frame 43 by a pin 53. In addition, a connecting frame 5 is provided at a lower portion of the front portion of the clamp beam 47.
7, the upper part of a link arm 61 is pivotally supported by a pin 59 on the connecting frame 57.

An upper portion of the link arm 55 and a lower portion of the link arm 61 are pivotally supported by a pin 63. A fluid cylinder 65 is fixed on the body frame 21, and a piston rod 67 mounted on the fluid cylinder 65 is connected to the pin 63.

With the above construction, when the fluid cylinder 65 is actuated, the piston rod 67 expands and contracts, so that the link arms 55 and 61 are moved in the Y-axis direction via the pin 63 and clamped with the pin 45 as a fulcrum. The beam 47 swings and the upper work clamp 51 swings. As a result, the work W is clamped or unclamped by the lower work clamp 39 and the upper work clamp 51.

Therefore, the work W is carried into the ironing and bending machine 3 by moving the moving frame 23 to the ironing and bending machine 3 side while the work W is clamped by the lower work clamp 39 and the upper work clamp 51. Positioned. In this state, the work W is pressed by the plate-pressing lower mold 9 and the plate-pressing upper mold 15, and the work W is subjected to forward bending and reverse bending by the bending molds 19A and 19B.

As shown in FIG. 1, the control device 69 for controlling the manipulator 5 is provided with a CPU 71. The CPU 71 stores bending program data such as bending shape, flange height and bottom dimension. Bending program input means 7 consisting of, for example, a keyboard
3 is connected, and output means 75, such as a CRT, for displaying various data is also connected.

The CPU 71 has a minimum pushing amount / memory 77 for storing a preset pushing amount (Z) and a maximum pushing amount (X) for preventing a preset work W from interfering with the plate pressing upper die 15. The maximum pushing amount / memory 79 is connected. Further, the CPU 71 is connected to a first discriminating means 81 for comparing and discriminating the actual Y-axis escape distance (work pushing amount) (Y) and the maximum pushing amount (X).

The CPU 71 has an interference determining means 83 for determining interference between the work flange portion and the plate pressing upper die 15 when the plate pressing upper die 15 is raised, and the interference discriminating means 83 causes the plate pressing upper die 15 to interfere with the work flange portion. In this case, a stopping means 85 for temporarily stopping the folding machine 3 and a restarting means 87 for restarting the folding machine 3 after a visual check by an operator after a momentary stop are connected. An override button 89 is provided in FIG. 3 to execute both the stopping means 85 and the restarting means 87.

The Y-axis escape distance (Y) is the work W
It is determined by the opening size and the work size. Note that, for example, when there is a size of the work W as shown in FIG. 2, the A distance is the opening size of the work W.

The state when the work W is pressed by the plate pressing lower mold 9 and the plate pressing upper mold 15 and the normal bending process is completed by the bending mold 19A is as shown in FIG. In FIG. 3, the relationship between the actual Y-axis escape distance (Y), the minimum pushing amount (Z), and the maximum pushing amount (X) is shown.

In FIG. 3, X is the minimum pushing amount that should be secured as much as possible, Y is the Y-axis escape distance that can be actually secured (distance from the Y-axis after bending to the mechanical end), and Z must be secured in the calculation so that the clamp beam 11 can be secured. It is a distance that may interfere with the work W when it rises. This distance Z may differ from the calculated value due to an error such as bending.

The operation of determining the Y-axis escape distance after the bending process is completed by the above structure will be described with reference to the flowchart shown in FIG. 4. First, the moving frame 23 is squeezed from the time when the bending process is completed. It is moved to the folding machine 5 side, and its moving distance, that is, the actual Y-axis escape distance (Y) is detected by the encoder 33 and taken into the CPU 71.

The Y-axis escape distance (Y) actually detected in step S1 is taken into the first discriminating means 81,
The actual Y-axis escape distance (Y) and the maximum work pushing amount (X) are compared and determined. When the actual Y-axis escape distance (Y) is smaller than the maximum work pushing amount (X) (Y <X), only the actual Y-axis escape distance (y) is secured in step S2, and the actual Y-axis escape distance (Y Y)
Is not less than the maximum work pushing amount (X) (Y
> X), the maximum work push amount (X) in step S3
Is secured and the process proceeds to step S4.

In step S4, the interference determining means 83 compares and determines the actual Y-axis escape distance (Y) and the minimum work pushing amount (Z). That is, the interference between the flange portion of the work W and the plate pressing die 15 is determined.

When the actual Y-axis escape distance (Y) is larger than the work minimum work pushing amount (Z) (Y ≧ Z)
In step S5, the clamp beam 11 is raised and the process proceeds to the next step. When the actual Y-axis escape distance (Y) is not larger than the work minimum work push amount (X) (Y <
In step Z6, the folding machine 3 is stopped in Z).

When the folding machine 3 is stopped for a moment, it is judged in step S7 whether or not the override button 89 is turned on.
When 9 is not turned on, the clamp beam 11 is stopped in step S8 and returned to the position before step S7. When the override button 89 is ON, it is determined in step S9 whether or not the clamp beam 11 has finished rising, and if the clamp beam 11 has finished rising, the process proceeds to the next step. If the clamp beam 11 has not finished rising, the clamp beam 11 is raised in step S10 and returned to the position before step S7.

As described above, when the Y-axis escape distance (Y) is smaller than the work minimum push-in amount (Z), that is, when the work W and the clamp beam 11 interfere with each other in calculation, they do not actually interfere with each other due to a bending error. In some cases, the bending machine 3 can be moved at will by the operator without completely stopping the bending machine 3, so that the degree of freedom in the work can be increased and waste in processing the work W can be eliminated. As a result, the work efficiency of bending can be improved.

The present invention is not limited to the above-described embodiments, but can be implemented in other modes by making appropriate changes.

[0042]

As can be understood from the above description of the embodiments, according to the inventions of claims 1 and 2, when the workpiece and the clamp beam interfere with each other in calculation, that is, the actual Y-axis escape distance. Is smaller than the work minimum push-in amount, it may not actually interfere due to bending errors, etc., so in such a case, the degree of freedom of work can be increased by providing a stopping means and a restarting means and operating the operator's will. It is possible to improve the work efficiency and reduce the waste in machining the work.

[Brief description of drawings]

FIG. 1 is a configuration block diagram of a control device that controls a manipulator in a bending device.

FIG. 2 is an explanatory diagram illustrating a work opening size.

FIG. 3 is an explanatory diagram showing a relationship between an actual work pushing amount, a minimum pushing amount, and a maximum pushing amount.

FIG. 4 is a flowchart for explaining the operation of the work pushing amount according to the present invention.

FIG. 5 is a side view of the bending apparatus according to the embodiment of the present invention.

FIG. 6 is an explanatory diagram showing a relationship between a distance to be secured and a distance that can be actually secured in a conventional work pushing amount.

[Explanation of symbols]

 1 Ironing and bending machine (folding machine) 3 Ironing and bending machine 5 Manipulator 9 Plate retainer lower die 15 Plate retainer upper die 19A, 19B Bend die 23 Moving frame 31 Y-axis drive motor 33 Encoder (position detection) 39) Lower work clamp 51 Upper work clamp 69 Control device 73 Bending program input means 77 Minimum pushing amount / memory 79 Maximum pushing amount / memory 81 First judging means 83 Interference judging means 85 Stopping means 87 Restarting means 89 Override button

Claims (2)

[Claims] 1. A bending program and a machine operation sequence are created based on bending data such as a bending shape of a product, a flange height, and a bottom dimension, and machine-specific data such as a plate pressing die, and the created bending processing is performed. Detects the Y-axis escape distance between the work flange after each bending process and the plate clamp upper die based on the program and machine operation sequence, and detects the plate clamp upper die and work flange when the plate clamp upper die moves up. If there is no possibility of interference, after checking the presence or absence of interference with the parts, if there is interference, put the folding machine in a suspended state, and in that state, the operator visually checks for interference and
A bending method characterized in that when the operator pushes the override button, the plate pressing upper die starts to rise. 2. A plate pressing upper mold for pressing a work at the time of bending by a plate pressing lower mold provided on a main body frame and the plate pressing lower mold pivotably supported by the main body frame. A clamp beam provided, a swingable bending die for bending the work while holding the work with the plate holding lower die and the plate holding upper die, and provided on the front side of the main body frame. In a bending apparatus composed of a manipulator which can be moved back and forth with a work clamp, a bending program input means for inputting bending data such as bending shape, flange height, bottom dimension, and the like. Based on the data, the work opening size after the bending process is completed, and the work size is used to calculate and store the minimum push-in amount that prevents interference between the work and the plate holder upper die. The amount of displacement / memory, the Y-axis escape distance when the manipulator is moved to the body frame, and the minimum amount of push-in / the minimum amount of push-in stored in the memory are taken in so that the Y-axis escape distance is less than the minimum amount of push-in. Interference determining means for determining whether or not it is above, stop means for temporarily stopping the bending machine when the plate pressing upper die interferes with the work flange portion by the interference determining means, and after a momentary stop, A folding device, comprising: a restarting unit that restarts the folding machine after the operator visually confirms it.