JP3295253B2 - Bending method and apparatus - Google Patents

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 particularly, to a method in which a work is held down by a plate holding lower die and a plate holding upper die, and the work is bent by the bending die. The present invention relates to a bending method and an apparatus for bending a workpiece, which is not stopped, but can be moved by a worker's intention when the workpiece interferes with a plate holding upper die.

[0002]

2. Description of the Related Art Conventionally, there has been known an ironing and bending apparatus which bends a work with a bending die in a state where the work is held down by a lower plate holding die and an upper plate holding die. In the case of this bending device, a manipulator having a work clamp and being movable back and forth is provided in front of the bending device.

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

[0006] In FIG. 6, an X distance is a distance to be secured as much as possible, a Y distance is a distance that can be actually secured, and a Z distance is a distance that must be secured.

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

[0006]

However, there are cases where the bending angle becomes tight or loose due to a bending error. At this time, even if the Y-axis escape amount can be reduced only to the distance Z or less, there is a case where the work does not actually interfere with the plate holding upper die. At this time, if the machine stops (becomes an alarm), there is a problem that the degree of freedom of work is low.

SUMMARY OF THE INVENTION An object of the present invention is to provide a bending machine which can be operated by a worker's will without stopping the machine completely when the Y-axis escape distance is equal to or less than a minimum value, thereby increasing the degree of freedom of work. It is an object of the present invention to provide a method and an apparatus therefor.

[0008]

In order to achieve the above object, a bending method according to the present invention according to the present invention comprises bending data such as a bent shape of a product, a flange height and a bottom dimension, and a plate holding die. A bending program and a machine operation sequence are created based on the data unique to the machine, and the Y of the work flange portion and the plate holding upper die after each bending process is completed based on the created bending program and the machine operation sequence. Detects the shaft escape distance, determines whether or not there is interference between the upper plate holding mold and the work flange when the upper plate holding die is raised. After the worker visually checks the interference, when there is no possibility of interference, the operator presses the override button, and the plate holding upper mold starts to rise. It is.

According to a second aspect of the present invention, there is provided a bending apparatus comprising: a plate holding lower die provided on a main body frame;
A clamp beam provided with a plate holding upper die that is pivotally supported by the main body frame and that presses a workpiece during bending with the plate holding lower die; and the plate holding lower die and the plate holding upper die. A bending process comprising a swingable bending die for bending a work while holding the work in place, and a manipulator provided in front of the main body frame and movable back and forth with a work clamp. In the device, the bending shape,
A bending program inputting means for inputting bending data such as a flange height and a bottom dimension, and a work and a plate holding upper die according to a work opening size and a work size after a bending process is completed by data from the bending program inputting means. The minimum push-in amount and memory in which the minimum push-in amount for preventing interference is calculated and stored, the Y-axis escape distance when the manipulator is moved to the main body frame, and the minimum push-in amount and memory are stored in the memory. Interference determining means for determining whether the Y-axis escape distance is equal to or greater than the minimum pressing amount by taking in the minimum pushing amount, and when the plate holding upper mold interferes with the work flange by the interference determining means. Stopping means for temporarily stopping the bending machine, and after a momentary stop, restarting the bending machine after visual confirmation by the operator And activation means and is characterized in that it comprises an.

[0010]

According to the bending method and the apparatus according to the first and second aspects, the work clamped by the work clamp is moved into the bending apparatus by the manipulator and is carried in and positioned. The loaded work is pressed by the lower plate holding die and the upper plate holding die, and bent by the bending die.

The manipulator is moved to the bending device, and the Y-axis escape distance is sequentially taken into the interference discriminating means. The interference discriminating means takes in the minimum pushing amount and the minimum pushing amount once stored in the memory, so that the interference discriminating means compares the actual Y-axis escape distance with the minimum pushing amount. If 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 stopping means.

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

Therefore, even when the flange portion of the work interferes with the upper plate holding die, the upper plate holding die can be moved by the operator's will without stopping the machine, thereby increasing the degree of freedom of work. Will be.

[0014]

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

Since an ironing bending apparatus as a bending apparatus is already known, a detailed description thereof will be omitted, and only a brief description will be given.

Referring to FIG. 5, for example, an ironing bending device 1 as a bending device is an ironing bending machine 3.
And a manipulator 5 for providing a work W supply service to the ironing and bending machine 3. The ironing / bending machine 3 includes a main body frame 7, and a lower plate holding die 9 is fixed to an upper portion of a front portion (right portion in FIG. 5) of the main body frame 7.

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

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

The body frame 7 and the clamp beam 11
A bending beam 17 that is swingable by a swing driving device (not shown) is provided at a foot portion between the bending beam 17 and bending dies 19A and 19B are provided at the tip of the bending beam 17.

With the above configuration, when the bending beam 17 is swung upward with respect to the work W held by the lower plate holding die 9 and the upper plate holding die 15, the normal bending process is performed by the bending die 19A. At the same time, when the bending beam 17 is swung downward, reverse bending is performed by the bending mold 19B.

The manipulator 5 has a fixed main body frame 21 and a movable frame 23 which is movable with respect to the main body frame 21 in the Y-axis direction (the left-right direction in FIG. 5) which is the front-rear direction. I have. That is, a plurality of guide rails 25 extending in the Y-axis direction are provided on the floor.
And the 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.
Is mounted with a Y-axis drive motor 31. The Y-axis drive motor 31 has an encoder 33 as position detection 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. In addition, a nut member 37 is screwed into the ball screw 35 and the nut member 3
7 is integrated with the moving frame 23.

When the Y-axis drive motor 31 is driven by the above configuration, the ball screw 35 is rotated, so that the movable frame 23 is connected to the guide rail 2 via the nut member 37.
5 to be moved in the Y-axis direction. The moving distance when the moving frame 23 is moved is the encoder 3
3 is detected.

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

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

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

With the above arrangement, when the fluid cylinder 65 is operated, 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.

Accordingly, 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 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 lower plate holding die 9 and the upper plate holding die 15, and the bending work 19A, 19B performs forward bending and reverse bending of the work W.

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

The CPU 71 stores a minimum pushing amount (Z) and a maximum pushing amount (X) for preventing interference between the work W and the upper presser die 15 set in advance. The maximum pushing amount / memory 79 is connected. Further, the CPU 71 is connected to first determining means 81 for comparing and determining the actual Y-axis escape distance (work pushing amount) (Y) and the maximum pushing amount (X).

The CPU 71 has an interference discriminating means 83 for discriminating the interference between the work flange portion and the upper die 15 when the plate presser is raised, and the upper die 15 presses against the work flange portion by the interference discriminator 83. In this case, a stopping means 85 for temporarily stopping the bending machine 3 and a restart means 87 for restarting the bending machine 3 after a momentary stop after visually confirming the worker are connected. In order to execute both the stop means 85 and the restart means 87, an override button 89 is provided in FIG.

The Y-axis escape distance (Y) is equal to the work W
Is determined by the opening size and work size. In addition, for example, when the size of the work W is as shown in FIG. 2, the distance A is the opening size of the work W.

FIG. 3 shows a state in which the workpiece W is pressed by the lower plate holding die 9 and the upper plate holding die 15 and the normal bending is completed by the bending die 19A. FIG. 3 shows the relationship among the actual Y-axis escape distance (Y), the minimum pushing amount (Z), and the maximum pushing amount (X).

In FIG. 3, X is the minimum pushing amount to be secured as much as possible, Y is the actually secured Y-axis escape distance (the distance from the bent Y-axis to the mechanical end), and Z is the calculated value. This is a distance that may interfere with the workpiece W when ascending. The distance Z may differ from the calculation due to an error such as bending.

The operation of determining the Y-axis escape distance after the completion of the bending process will be described with reference to the flowchart shown in FIG. 4. First, the moving frame 23 is moved from the time when the bending process is completed. It is moved to the bending machine 5 side, and the 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) is compared with the maximum work pushing amount (X). If the actual Y-axis escape distance (Y) is smaller than the maximum work pushing amount (X) (Y <X), in step S2, the actual Y-axis escape distance (y) is secured and the actual Y-axis escape distance (Y) is set. Y)
Is not smaller than the maximum work pushing amount (X) (Y
> X) is the maximum work pushing amount (X) in step S3.
And the process proceeds to step S4.

In step S 4, the actual Y-axis escape distance (Y) and the minimum work pushing amount (Z) are compared and determined by the interference determining means 83. That is, interference between the flange portion of the work W and the plate holding die 15 is determined.

When the actual Y-axis escape distance (Y) is larger than the minimum work pushing amount (Z) (Y ≧ Z)
In step S5, the clamp beam 11 is raised in step S5, and proceeds to the next step. When the actual Y-axis escape distance (Y) is not larger than the minimum work pushing amount (X) (Y <
In Z), the bending machine 3 is stopped in step S6.

When the folding machine 3 is momentarily stopped, it is determined in step S7 whether or not the override button 89 is turned on.
When the switch 9 is not ON, the clamp beam 11 is stopped in step S8 and returned to the position before step S7. If the override button 89 is ON, it is determined in step S9 whether the clamp beam 11 has finished ascending. If the clamp beam 11 has finished ascending, the process proceeds to the next step. If the clamp beam 11 has not been completely lifted, the clamp beam 11 is raised in step S10 and returned to a position before step S7.

As described above, when the Y-axis escape distance (Y) is smaller than the minimum work indentation (Z), that is, even if the work W and the clamp beam 11 interfere with each other in calculation, they do not actually interfere due to a bending error or the like. In some cases, the bending machine 3 can be moved by the worker's intention without completely stopping the bending machine 3, so that the degree of freedom of work can be increased, and waste in processing the work W can be reduced. As a result, the working efficiency of the bending process can be improved.

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

[0042]

As will be understood from the above description of the embodiments, according to the inventions according to claims 1 and 2, when the work and the clamp beam interfere in calculation, that is, the actual Y-axis escape distance When the value is smaller than the minimum pushing amount of the work, there is a case where there is no interference due to a bending error or the like. , And waste in processing the workpiece can be eliminated.

[Brief description of the 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 dimension.

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

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

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

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

[Description of Signs] 1 Ironing / bending device (bending device) 3 Ironing / bending machine 5 Manipulator 9 Lower plate holding die 15 Upper plate holding die 19A, 19B Bending die 23 Moving frame 31 Y-axis drive motor 33 Encoder (Position Detecting Means) 39 Lower Work Clamp 51 Upper Work Clamp 69 Control Device 73 Bending Program Input Means 77 Minimum Push Amount / Memory 79 Maximum Push Amount / Memory 81 First Judgment Unit 83 Interference Judgment Unit 85 Stop Unit 87 Restart Means 89 Override button

Claims (2)

(57) [Claims] 1. A bending program and a machine operation sequence are created based on bending data such as a bending shape, a flange height and a bottom dimension of a product and machine-specific data such as a plate presser die. Based on the program and machine operation sequence, the Y-axis escape distance between the work flange after each bending process and the work clamp is detected, and the work clamp and the work clamp when the work clamp is raised. If there is no possibility of interference after checking the presence of interference with the part and suspending the bending machine in the case of interference, the worker visually checks the interference in that state,
A bending method wherein an upper die of the plate presser starts to rise when an operator presses an override button. 2. A plate holding upper die provided on a main body frame and a plate holding upper die which is pivotally supported by the main body frame and is capable of holding a work during bending work. A clamp beam provided, an oscillating bending die that bends the work while holding the work with the lower plate holding die and the upper plate holding die, and a front end of the main body frame. In a bending apparatus comprising a manipulator capable of moving back and forth with a work clamp, a bending program input means for inputting bending data such as a bending shape, a flange height, a bottom dimension, and the like. The minimum press-in amount that prevents the interference between the work and the plate holding upper die is calculated and stored according to the work opening size and the work size after the bending process is completed based on the data. And the memory and the Y-axis escape distance when the manipulator is moved to the main body frame and the minimum push amount and the minimum push amount stored in the memory so that the Y-axis escape distance is smaller than the minimum push amount. Interference determination means for determining whether or not the above, and stop means for temporarily stopping the bending machine when the plate holding upper mold interferes with the work flange portion by the interference determination means, after a momentary stop, And a restarting means for restarting the bending machine after visual confirmation by an operator.