JP3295256B2 - Bending method and bending device - 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 method and a bending apparatus, and more particularly, to a bending method in which a work is clamped by a work holding die and the clamp portion is folded by a bending die. And a bending device.

[0002]

2. Description of the Related Art A bending method and a bending method in which a work is clamped in a sandwiching manner by upper and lower work holding dies arranged along a bending line, and the clamp portion is folded in a folding manner by a bending mold. Processing equipment is already known, and is disclosed, for example, in JP-A-57-4322.

[0003] An outline of a bending apparatus will be described with reference to FIGS. The bending apparatus 1 has a clamp beam 7 provided on the bender body 3 so as to be rotatable in a substantially vertical direction by a shaft 5. The lower work holding mold 9 and the clamp beam 7 attached to the bender body 3 The work W is clamped in a sandwiching manner by the provided upper work holding mold 11, and the clamp portion is folded in a folding manner by a bending mold 17 attached to the vent beam 15.

[0004] A manipulator 19 is arranged in front of the bending apparatus 1. The manipulator 19 is equivalent to the one shown in Japanese Patent Application Laid-Open No. 1-309729, and is a horizontal direction as viewed in the bending line direction (FIG. 6C). The center position of the feed screw mechanism 21 (hereinafter, this center position may be referred to as the machine center) Cm in the X-axis direction coincides with the center position Cm.
The workpiece W is held by the lower fixed arm 23 and the upper movable arm 25 in a sandwiching manner, and the workpiece W is bent. It is carried into the work clamp part of the apparatus 1.

In the bending apparatus as described above, as shown in FIGS. 6A to 6C, the upper work holding mold 11 is allocated to the machine center Cm and It is arranged symmetrically in the X-axis direction,
The work W is carried into the work clamp unit of the bending apparatus 1 in a state where the work center Cw is gripped by the manipulator 19 and the work center Cw and the machine center Cm are matched by the manipulator 19. In this case, the center position of the upper work holding mold 11 in the X-axis direction and the work center Cw of the work W are both the machine center Cm.
The work W is bent by a so-called center vent that conforms to the above.

[0006]

As shown in FIGS. 7A to 7C, when the work center Cw cannot be gripped by the manipulator 19 due to the opening a in the work W, the manipulator is used. Reference numeral 19 indicates that the workpiece W must be gripped while being offset in the X-axis direction. In this case, the work W is carried into the work clamp portion of the bending apparatus 1 in a state where the work center Cw and the machine center Cm do not match, that is, in an offset state.

On the other hand, since the upper work holding mold 11 is allocated to the machine center Cm, the center position of the upper work holding mold 11 in the X-axis direction does not coincide with the work center Cw of the work W. Therefore, as shown in FIG. 7 (c), if the work W has a flange piece b, this interferes with the upper work holding die 11, and as a result, the work W may not be bent. .

[0008] In the bending by this type of bending apparatus, the accuracy of bending may be poor due to poor adjustment of the machine, abrasion of the holding die, bending die, or notch of the work.

Conventionally, a clamp beam,
In a bending apparatus in which each of the bent beams is driven by one eccentric shaft, a shim is sandwiched between mounting portions of the holding die and the bending die, and the mounting positions of these dies are finely adjusted. Adjustments have been made.

This shim adjustment cannot be automated, and is all performed manually by trial and error, so that it takes time and effort, which causes a reduction in work efficiency and machine operation efficiency.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and a work carried into a work clamp portion in an offset state can be accurately bent without causing interference with a holding mold. It is an object of the present invention to provide a bending method and a bending apparatus capable of automatically performing the bending accuracy without the need for shim adjustment.

[0012]

In order to achieve the above-mentioned object, a bending method according to the present invention is characterized in that a work is clamped by a work holding mold arranged along a bending line, and the work is clamped. In a bending method in which a part is bent in a folding manner by a bending mold, a work holding mold is offset from a center position in a bending line direction of a bending apparatus in a bending line direction to clamp a work. Accordingly, a magnitude relation is given to the workpiece clamping force on both sides of the center position, and the workpiece is bent in this clamped state.

Further, in order to achieve the above-mentioned object, a bending apparatus according to the present invention clamps a work by a work holding die arranged along a bending line,
In a bending apparatus for bending the clamp portion in a folding manner using a bending die, a work holding die is provided so as to be offsetly movable in the bending line direction of the bending apparatus.

In order to achieve the above-mentioned object, in the bending apparatus according to the present invention, the work holding mold is a center holding mold and a split holding metal arranged on both sides of the center holding metal. The split holding dies are individually provided so as to be movable in the bending line direction with respect to the center holding dies.

[0015]

According to the above-described configuration, the work is clamped in a state where the work holding mold is offset from the center position of the bending device in the bending line direction in the bending line direction, thereby folding the work. A magnitude relation is given to the work clamping force at the center position of the bending apparatus in the bending line direction, that is, at both sides of the machine center. When the work is bent in this clamped state, one-sided load due to the offset vent acts on the work,
On the side where the work clamp force is large, a large load acts on the work as compared with the small side, and the work is sharply bent. On the other hand, on the side where the work clamp force is small, a small load is applied on the work as compared with the large side. Instead, it is bent roughly.

Thus, the bending angle in the bending line direction changes according to the offset amount of the work holding die, and the bending can be finely adjusted by controlling the offset amount of the work holding die. .

The offset arrangement of the work holding mold is performed with an arbitrary offset amount by moving the work holding mold in the bending line direction of the bending apparatus. Since the holding dies are individually moved in the bending line direction with respect to the center holding dies, the number of work holding dies used is variably set to an appropriate number individually on both sides of the work center.

As a result, the work holding mold is offsetly arranged with an arbitrary offset amount. Therefore, even if the work is carried into the work clamp portion in an offset state,
The work does not interfere with the holding mold.

[0019]

Embodiments of the present invention will be described below in detail with reference to the drawings. In the embodiments of the present invention, the same parts as those of the conventional example are denoted by the same reference numerals as those of the conventional example, and description thereof will be omitted.

1 to 3 show an embodiment of a bending apparatus according to the present invention. Upper work holding die 31
Are one central holding mold 33 and a central holding mold 33
And a plurality of divided presser dies 35a to 35d and 37a to 37d which are aligned on the left and right sides along the X-axis direction, respectively.

The center pressing die 33 is screwed at a feed nut portion 43 to a feed screw rod 41 in the X-axis direction, which is rotatably provided on the upper movable clamp beam 7 by a bracket 39. Rotation enables movement in the X-axis direction, in other words, in the offset arrangement direction.

The feed screw rod 41 is drivingly connected to a mold positioning servomotor 47 by a timing belt type synchronous transmission mechanism 45, and is rotationally driven by the mold positioning servomotor 47.

The center pressing die 33 fixedly supports left and right support shafts 49 and 51 extending horizontally in the X-axis direction, that is, in the bending line direction of the bending device.
Each of 9 and 51 is divided into left and right split press dies 35a to 35
d and 37a to 37d are individually supported so as to be slidable in the X-axis direction.

The center holding mold 33 has left and right hydraulic cylinder devices 53 and 55 (in FIG. 1, the left hydraulic cylinder device 53 is shown for simplicity of illustration, and the right hydraulic cylinder device 53 is shown. The illustration of the hydraulic cylinder device 55 is omitted.The hydraulic cylinder device 55 for the right side is shown in FIG.
Please refer to FIG. 2 and 3, the illustration of the left hydraulic cylinder device 53 is omitted for the sake of simplicity. ) Are attached.

The hydraulic cylinder device 5 for the left side and the right side
Engagement pins 61, 63 driven in and out by drive means (not shown) are provided at the distal end portions of the respective piston rods 57, 59 of the respective 3, 55.
Are selectively removably engaged with engagement recesses 65, 67 formed in each of the split holding molds 35a to 35d, 37a to 37d.

The fluid pressure cylinder devices 53, 55 slide the split holding dies 35a-35d, 37a-37d, which are engaged with the engagement recesses 65, 67 by the engagement pins 61, 63, in the X-axis direction. Let it.

In the standard arrangement state, as shown in FIG. 1, the center Cc of the upper holding mold 31 formed by the center of the center holding mold 33 is located at a position corresponding to the machine center Cm, and the left and right divisions are performed. Pressing dies 35a to 35d, 37a
37d are symmetrically arranged on the left and right sides of the center holding mold 33 with the symmetrical point. In this state, the right and left work clamping forces are substantially equal on both sides of the machine center Cm, and the bending is performed at the center vent. In this case, the manipulator may carry in the work W while holding the center of the work W.

In the case where the work center Cw cannot be gripped by the manipulator and the work W is carried into the work clamp portion in an offset state, or when an offset vent is performed for the purpose of assuring bending accuracy, the work center Cm is not moved. The entire upper holding die 31 is moved to the machine center C with an offset amount corresponding to a carry-in offset amount or an offset amount required for accuracy as in bending.
It is moved in the X-axis direction with respect to m, and is offset.

The movement of the entire upper pressing die 31 in the X-axis direction with respect to the machine center Cm is performed by rotating the feed screw rod 41 by the die positioning servomotor 47 and moving the central pressing die 33 in the X-axis direction. Is done automatically by The moving direction of the center pressing mold 33 in the X-axis direction is controlled by the polarity control of the mold positioning servomotor 47,
The movement amount is quantitatively controlled by the number of pulses given to the mold placement servomotor 47.

FIG. 2 shows an example in which the upper holding die 31 is offset to the left of the machine center Cm in the X-axis direction with an offset amount α.

In this case, the machine center C for loading the workpiece is used.
The offset amount with respect to m is an offset amount equal to the offset amount α of the upper holding mold 31.

As a result, the work center Cw and the center Cc of the upper holding die 31 match, and the split holding die 35
If the used numbers of a to 35d and 37a to 37d are set to appropriate values, and the X-axis dimension of the upper holding mold 31 is an appropriate value that matches the X-axis dimension of the work W, the work center Cw is operated by the manipulator. When the work is carried into the work clamp portion in the offset state, the upper holding die 31 does not interfere with the flange piece of the work W, and the bending process is performed without any trouble.

The upper holding die 3 shown in FIG.
In the offset arrangement state of 1, the clamping force is larger on the right side of the drawing than on the left side of the drawing with respect to the machine center Cm, and accordingly, the load acting on the work W becomes larger and is tighter than on the left side. At the left side in the drawing, the clamping force is smaller than at the right side, and accordingly, the load acting on the work W becomes smaller, and the workpiece W is more bent than at the right side.

From this, the bending angle in the bending line direction changes in accordance with the offset amount of the upper holding die 31, and the bending can be adjusted by controlling the offset amount of the upper holding die 31. This makes it possible to automate the accuracy of bending as required without the need for shim adjustment.

The offset arrangement of the upper holding die 31 is as follows.
The number of the left divided holding molds 35a to 35d is different from the number of the right divided holding molds 37a to 37d used, and the center Cc of the upper holding mold 31 is shifted from the center of the center holding mold 33 in the X-axis direction. This is also done by biasing to. By selecting and setting the number of used dies, the dimensions of the work holding dies can be changed without the need to replace the dies.

The left and right split pressing dies 35a to 35a
d, 37a to 37d are set by using the hydraulic pressure cylinder devices 53 and 55 to divide the presser dies 35a to 35d.
d, 37a to 37d are automatically performed by sliding displacement in the X-axis direction.

FIG. 3 shows a state in which the right presser die 37b is biased to the right by the hydraulic cylinder device 55 in comparison with the state shown in FIG. The figure shows an example in which dies 35a to 35c and two right-side divided pressing dies 37a and 37b are used.

In this case, the offset amount is indicated by the symbol β, and in this case, the machine center Cm for carrying in the workpiece.
Is an offset amount equal to the offset amount β of the upper pressing die 31. As a result, the work center Cw and the center Cc of the upper holding die 31 match.

In this case as well, the clamping force is larger on the right side of the drawing than the left side, and the load acting on the work W is correspondingly larger on the right side of the machine center Cm and is tighter on the left side. In the figure, on the left side in the figure, the clamping force is more damp than on the right side, and accordingly, the load acting on the work W is reduced, and the work is more bent than on the right side.

FIGS. 4A to 4C show specific examples of the bending process. FIG. 4A shows the work W. When the piece W is bent, the work W is gripped by the manipulator at a position m shifted from the work center Cw by α in the X-axis direction, and is carried into the clamp unit.

The dimension of the upper holding mold 31 in the X-axis direction is set to a value equal to the dimension L of the piece by setting the number of divided holding molds 35a to 35d and 37a to 37 used.

At the time of bending the piece, as shown in FIG. 4B, the upper holding mold 31 is offset to the left with an offset amount α, and the center Cc of the upper holding mold 31 and the work center Cw are connected to each other. To match.

On the other hand, when the work W is horizontally rotated by 180 degrees by the manipulator when the piece is bent and the piece is bent, as shown in FIG. The mold 31 is offset to the right with an offset amount α, and the center C of the upper holding mold 31 is adjusted.
c and the work center Cw are matched.

FIG. 5 shows an example of a control system of the bending apparatus having the above-described configuration.

The control system includes an operation command generation unit 71 such as a microcomputer, and a product processing program in which product shape data such as a bent shape, a flange height, and a base dimension, and workpiece gripping position data by a manipulator are written. And a memory 73 for storing

The operation command generator 71 is a bending command generator 75
And a holding die command generation unit 77.

The bending command generation unit 75 generates a manipulator operation command, a clamp beam operation command, and a vent beam operation command according to the product processing program input from the memory 73, and transmits these operation commands to the manipulator drive control unit 79, the clamp beam drive control. A command signal is output to each of the unit 81 and the vent beam drive control unit 83.

In response to a manipulator operation command given to the manipulator drive control unit 79, the work W may be carried into a clamp unit while being gripped by a manipulator other than the work center Cw.

The holding mold command generating section 77 has a memory 73
The offset command, the left mold number command, and the right mold number command are generated in accordance with the input product processing program, and these commands are transmitted to the drive control unit 8 of the mold arrangement servomotor 47.
5. a drive circuit 91 for solenoid valves 87 and 89 for controlling the supply of fluid pressure to the fluid pressure cylinder devices 53 and 55;
93.

The offset command is generated when the work center Cw carried in by the manipulator does not match the machine center, and is output to the drive control unit 85.

The drive controller 85 includes a positioning unit 95
And a current amplifier 97, which is supplied with the rotation angle information of the mold placement servomotor 47 from the rotary encoder 99 and controls the drive of the mold placement servomotor 47 in a feedback compensation manner.

Thus, the offset amount of the upper holding die 31 is quantitatively variably set.

Although the present invention has been described in detail with reference to specific embodiments, the present invention is not limited to these embodiments, and various embodiments can be made within the scope of the present invention. Some will be apparent to those skilled in the art.

[0054]

As will be understood from the above description, according to the bending method and the bending apparatus according to the present invention,
Since the work holding mold is offset with an arbitrary offset amount, even if the work is carried into the work clamp in the offset state, the work does not interfere with the holding mold, and the work is bent. Is performed without any trouble.

Further, since the work clamping is performed in a state where the work holding mold is offsetly arranged with an arbitrary offset amount, the bending angle changes due to a difference in work clamping force generated on both sides of the machine center. Therefore, the bending path can be adjusted according to the offset amount of the work holding die without the need for complicated shim adjustment. Thereby, it becomes possible to automate the precision setting as the bending by controlling the offset amount of the work holding die.

Also, among the work holding dies, the divided holding dies are individually moved in the bending line direction with respect to the center holding dies, so that the number of work holding dies used on both sides of the work center is reduced. Thus, the number of the workpiece holding molds can be changed individually without changing the molds.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of a bending apparatus according to the present invention in a center vent state.

FIG. 2 is a front view showing an embodiment of the bending apparatus according to the present invention in an offset vent state.

FIG. 3 is a front view showing an embodiment of the bending apparatus according to the present invention in an offset vent state in which the number of used left and right split press dies is different.

FIG. 4A is a plan view showing a specific example of a work,
(B), (c) is a front view which shows the offset arrangement state of the upper holding | maintenance metal mold | die 31, respectively.

FIG. 5 is a block diagram showing an example of a control system of the bending device according to the present invention.

FIGS. 6 (a), (b), and (c) are a plan view, a side view, and a front view, respectively, showing a state of bending by a general center vent.

FIGS. 7A, 7B, and 7C are a plan view, a side view, and a front view, respectively, showing a state of bending by a conventional offset vent.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bending apparatus 3 Vendor main body 7 Clamp beam 9 Lower work holding mold 13 Upper work holding mold 15 Vent beam 17 Bending mold 19 Manipulator 31 Upper work holding mold 33 Central holding mold 35a to 35d, 37a to 37d Split holding die 41 Feed screw bar 47 Die arrangement servo motor 53, 55 Fluid pressure cylinder device 61, 63 Engagement pin 65, 67 Engagement concave portion 71 Operation command generation unit 73 Memory 75 Bending command generation unit 77 Pressing die command Generation unit 79 Manipulator drive control unit 81 Clamp beam drive control unit 83 Bent beam drive control unit 85 Drive control unit 91, 93 Drive circuit

Claims (3)

(57) [Claims] In a bending method in which a work is clamped by a work holding die arranged along a bending line and the clamp portion is folded in a folding manner by a bending die, the work holding die is folded. By clamping the work by arranging it in the bending line direction offset from the center position in the bending line direction of the bending apparatus, giving a magnitude relationship to the work clamping force on both sides of the center position as a boundary,
A bending method, wherein the work is bent in the clamped state. 2. A bending apparatus in which a workpiece is clamped by a workpiece holding die arranged along a bending line and the clamp portion is folded in a folding manner by the bending die. A bending apparatus characterized by being provided so as to be able to be offset-moved in a bending line direction of the bending apparatus. 3. The work holding mold comprises a center holding mold and split holding dies arranged on both sides of the center holding mold, respectively, and each of the split holding dies is individually provided with the center holding metal. The bending apparatus according to claim 2, wherein the bending apparatus is provided so as to be movable in a bending line direction with respect to the mold.