JP2001150034A - Bending device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a forming accuracy of a work-piece by determining a location for positioning a stick precisely by means of correcting a punch installation error. SOLUTION: A device comprises a punch position calculating means 21B which works when a stick 3 having migrated before forming contacts with the punch P, and calculates a real punch position B' based on the migration length L of the stick 3, a correction value calculating means 21C which calculates a corrected value C for positioning the stick 3 based on the real punch position B' and a punch position B being input beforehand; and a stick positioning control means 21D for positioning a stick 3 at a predetermined location based on the corrected value.

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 bending apparatus for improving the processing accuracy of a work by absorbing a punch mounting error and accurately determining a positioning position for abutment.

[0002]

2. Description of the Related Art It is well known that in a bending apparatus such as a press brake, a back gauge device is provided at a rear portion thereof to position a workpiece before bending.

This back gauge device is, for example, shown in FIG.
(A), a supporter 11 provided on both sides of the lower table 10 (in the X-axis direction);
A post 6 attached to the upper end, a stretch 5 attached to the posts 6 at both ends and extending in the left-right direction (X-axis direction), a main body 4 mounted on the stretch 5, and an abutment 3 attached to the main body. I have.

With this configuration, the X-axis motor Mx is driven to move the main body 4 on which the abutment 3 is mounted in the X-axis direction on the stretch 5, and the Y-axis motor My is driven to move the main body 4 The main body 4 is moved along the stretcher 5 with the post 6 in the Y-axis direction along the supporter 11 and further driven by the Z-axis motor Mz.

[0005] In this way, after the abutment 3 is preliminarily positioned at a predetermined position, the work W is abutted against the abutment 3 (FIG. 7A), and the punch P of the upper table 9 is ,
The work W is bent in cooperation with the die D of the lower table 10.

[0006]

However, the above conventional technique (FIG. 7A) has the following problems.

That is, as described above, the work W is brought into contact with the abutment 3.
It is necessary to position the abutment 3 in the X-axis direction, the Y-axis direction, and the Z-axis direction in advance before the abutment is performed.

As described above, the positioning in the Y-axis direction is performed by driving the Y-axis motor My (FIG. 6A) so that the main body 4 to which the abutment 3 is attached is supported together with the post 6 by the supporter. 11 along the Y-axis direction.

Then, as shown in FIG. 6B, a distance G is defined with respect to a reference line K connecting the center of the punch P and the center of the die D.
When the abutment 3 is positioned at the position, the flange dimension of the workpiece W to be machined is determined based on the distance G.

However, conventionally, the abutment 3 is moved and positioned in the Y-axis direction without considering the mounting error of the punch P, so that the distance G may differ from the actual value.

As a result, there is a problem in that the flange dimensions of the work W are out of order and the processing accuracy is reduced.

SUMMARY OF THE INVENTION It is an object of the present invention to improve the machining accuracy of a work by absorbing a punch mounting error and accurately determining a positioning position for abutting.

[0013]

In order to solve the above-mentioned problems, according to the present invention, as shown in FIG. 1, (A) a punch P mounted on an upper table 9 and a die D mounted on a lower table 10 are provided. By moving one of them up and down,
In a bending apparatus for bending a work W,
(B) Punch position calculating means 21B which starts when the abutment 3 is moved before processing and comes into contact with the punch P, and calculates the actual punch position B 'based on the movement distance L of the abutment 3
(C) a correction value calculating means 21C for calculating a correction value C for positioning the abutment 3 based on the actual punch position B 'and the punch position B input in advance, and (D) the correction value C The present invention employs a technical means called a bending apparatus, which comprises abutment positioning control means 21D for positioning the abutment 3 at a predetermined position based on the above.

Therefore, according to the structure of the present invention, the actual punch position B 'is calculated by the punch size calculating means 21B (FIG. 1).
= Y-L (FIG. 4), and the correction value calculating means 21C calculates the punch mounting error e = based on the actual punch position B '= 5.5 mm and the previously input punch position B = 5 mm.
B′−B = 5.5 mm−5 mm = 0.5 mm (FIGS. 4 and 5), that is, the correction value C = 0.5 mm is calculated. For example, when the distance for determining the flange dimension of the work W is 10 mm, (FIG. 6), considering the correction value C = 0.5 mm, 10 mm + 0.5 mm by the abutting positioning control means 21D.
Only the abutment 3 is moved and positioned.

Therefore, the punch mounting error e (FIG. 5) is absorbed, and the abutting positioning position can be accurately obtained.
Work accuracy of the workpiece can be improved.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the accompanying drawings according to embodiments. FIG. 1 is an overall view showing an embodiment of the present invention, and FIG. 2 is a view showing a specific example of the present invention.

The bending apparatus according to the present invention is, for example, a press brake, which has an upper table 9 and a lower table 10 (FIG. 1).
, A die P is mounted on the lower table 10, respectively.

The press brake is, for example, an ascending type. The work W is bent by the cooperation of the punch P and the die D when the lower table 10 moves up and down.

The abutment 3 is attached to a main body 4 to be described later via an insulating member 17, and the punch P is attached to an upper table 9, respectively.

A contact 1 is provided on the front surface of the abutment 3 and a contact 2 is provided on the rear surface of the punch P, and the contacts 1 and 2 constitute a switch SW.

With this configuration, when the abutment 3 is moved in the Y-axis direction and brought into contact with the punch P, the contacts 1 and 2 also come into contact with each other, so that the switch SW is turned on.
An activation signal S1 is output from the contact detection means 20 (FIG. 1).

That is, when the switch SW is turned on, the power of the contact detection means 20 is turned on to conduct electricity, and the contact detection means 20 outputs a start signal S1.
Is input to the NC 21 at the next stage.

The NC 21 comprises control means 21A, punch position calculating means 21B, correction value calculating means 21C, abutting positioning control means 21D, and storage means 21E.

The control means 21A sends instructions to the punch size calculation means 21B and the like to control them,
The entire device shown in FIG. 1 is controlled.

The punch position calculating means 21B is activated by the activation signal S1, and calculates an actual punch position B 'based on the moving distance L of the abutment 3.

For example, in FIG. 4, let L be the moving distance when the abutment 3 is moved from the initial position (broken line) in the Y-axis direction and brought into contact with the punch P.

A reference line K connecting the center of the punch P and the center of the die D is defined as the origin 0 of the Y axis, and the initial position Y of the abutment 3 based on the origin 0 is known in advance.

Accordingly, the punch position calculating means 21B calculates the actual punch position B '= YL by calculating the difference between the initial position Y of the butting 3 and the moving distance L.

The correction value calculating means 21C inputs the actual punch position B 'calculated by the punch position calculating means 21B as a signal S2, and based on the actual punch position B' and the previously input punch position B. A correction value C for positioning the butting 3 is calculated.

For example, the preceding-stage punch position calculating means 21B
It is assumed that the actual punch position B 'calculated by the above is 5.5 mm, and the punch position B previously input and stored in the storage means 21D is 5 mm.

In this case, the difference e = B'-B = 0.5
mm is the punch mounting error e (FIG. 5), and the correction value calculating means 21C calculates this as the correction value C = B'-B = 0.5 m
It is calculated as m.

The collision positioning control means 21D inputs the correction value C calculated by the correction value calculation means 21C at the preceding stage as a signal S3, and based on the correction value C, determines the collision 3
At a predetermined position in the Y-axis direction.

For example, as shown in FIG. 6, there is a case where a bending process is performed in which the distance for determining the flange size of the work W is 10 mm.

In this case, as described above, assuming that the correction value C calculated by the correction value calculating means 21C is 0.5 mm, the abutting positioning control means 21D sends the command signal S4 to the Y-axis motor My. Output, hit 3 is 10
mm + 0.5 mm (FIG. 6).

The abutting positioning control means 21D also controls the positioning of the abutting 3 in the X-axis direction and the Z-axis direction, in addition to the positioning control of the abutting 3 in the Y-axis direction.

On the other hand, a back gauge device as shown in FIG. 2 is provided behind the press brake.

This back gauge device is provided with a lower table 1
A supporter 11 provided on both sides of the supporter 0 (in the X-axis direction); a post 6 attached to the supporter 11; a stretch 5 attached to the posts 6 at both ends and extending left and right (in the X-axis direction); The main body 4 has an abutment 3 provided with the above-mentioned contact 1 via an insulating member 17.

The supporter 11 extends from both ends of the lower table 10 in the Y-axis direction. A ball screw 11 penetrates through the supporter 11, and the ball screw 11 is provided with a Y-axis motor My.
And to the post 6 via a nut 7.

Each of the posts 6 has a stretch 5 attached thereto.
It extends in the axial direction.

Further, the ball screws 14 are provided in the two posts 6.
(FIG. 1), and the ball screw 14
, And is connected to the stretch 5 via a nut 16.

Therefore, according to this configuration, if the Y-axis motor My and the Z-axis motor Mz are rotated by the abutting positioning control means 21C (FIG. 1), the entire stretch 5 becomes Y
It can move in the axial direction and the Z-axis direction.

On the other hand, as shown in the drawing, a rack 12 is provided on the stretch 5, and the rack 12 meshes with a pinion 15 (FIG. 1) built in the abutment main body 4, and the pinion 15 It is connected to an X-axis motor Mx fixed to the main body 4.

The main body 4 has abutment 3 at its front portion via the insulating member 17 and is slidingly connected to the stretch 5 via, for example, an LM guide.

Accordingly, with this configuration, if the X-axis motor Mx is rotated via the abutting positioning control means 21C (FIG. 1), the main body 4 can be moved in the X-axis direction, and accordingly, the main body 4 can be moved. Can also move in the X-axis direction.

That is, the abutment 3 can move on the stretch 5 in the X-axis direction and together with the stretch 5 in the Y-axis direction and the Z-axis direction.

The operation of the present invention having the above configuration will be described with reference to FIG.

(1) Operation until the abutment 3 contacts the punch P and stops.

In step 101 of FIG.
Is mounted, and in step 102, the position B of the punch P
Is input, and in step 103, the abutment 3 is advanced.

That is, before machining, the operator mounts a predetermined punch P (FIGS. 1 and 2) on the upper table 9 and
The position B of the punch P is input from a keypad (not shown) of the NC 21 and stored in the storage means 21E, and the Y-axis motor M is input via the abutting positioning control means 21D (FIG. 1).
By controlling y, the abutment 3 is advanced.

In this case, the abutting positioning control means 21D is provided via an encoder (not shown) of the Y-axis motor My.
Always detects the position of the abutment 3, and switches the speed from about 1 mm before the punch P to advance at a low speed.

Next, in step 104 of FIG.
It is determined whether or not the punch P has been touched. If not, the process returns to step 103 and the same operation is repeated. If the touch has been made (YES), step 105 is performed.
In step 3, the stop 3 is stopped.

That is, when the abutment 3 comes into contact with the punch P (FIG. 1), the contacts 1 and 2 come into contact, and the switch SW is turned on. The start signal S1 is output to the punch position calculating means 21A of the NC 21.

The punch position calculating means 2 for the start signal S1
The control means 21A of the NC 21 that has detected the input to the
The Y-axis motor My is controlled via the abutment positioning control means 21D to stop the abutment 3.

(2) Operation until positioning of the abutment 3 at a predetermined position.

In step 106 of FIG. 4, the actual punch position B 'is calculated based on the moving distance L of the abutment 3.
In step 107, a correction value C for positioning the abutment 3 based on the actual punch position B and the input punch position B is calculated, and in a step 108, the abutment 3 is positioned.

That is, the punch size calculating means 21B, which receives the start signal S1 from the contact detecting means 20 (FIG. 1), determines the initial position Y of the abutment 3 (FIG. 4), and the abutment 3 contacts the punch P. The actual punch position B '= YL = 5.5 mm is calculated by taking the difference from the moving distance L until the punching.

Then, the punch position B '= 5.5 mm
Correction value calculating means 21 which has input as a signal S2 (FIG. 1)
C is a punch mounting error e by taking the difference from the punch size B = 5 mm previously input to the storage means 21E.
(FIG. 5), that is, the correction value C = B'-B = 5.5 mm-5 m
Calculate m = 0.5 mm.

Further, the correction value C = 0.5 mm is applied to the signal S
3 (FIG. 1), butting control means 21D
Is the distance for determining the flange dimension of the work W of 10 mm
(FIG. 6), the command signal S4 is
By outputting the signal toward y, the abutment 3 is positioned at a position of 10 mm + 0.5 mm in the Y-axis direction.

The hitting position control means 21D outputs the command signal S4 to the X-axis motor Mx and the Z-axis motor Mz to move the hitting position 3 to predetermined positions in the X-axis direction and the Z-axis direction. Position.

(3) Bending operation.

As described above, the abutting positioning control means 21
D (FIG. 1), butting 3 is performed in the X-axis direction, the Y-axis direction, and Z
After being positioned at a predetermined position in the axial direction, the worker abuts the workpiece W against the positioned abutment 3 (FIG. 2) and raises the lower table 10 to allow the punch P and the die D to cooperate. By the operation, the work W is subjected to bending in step 109 in FIG.

In the above embodiment, the present invention
The case where the present invention is applied to an ascending press brake has been described, but the present invention is not limited to this, and it is needless to say that the present invention is also applied to a descending press brake in which the upper table 9 moves up and down and has the same effect as above. It is.

[0063]

As described above, according to the present invention, the actual punch position is calculated by the punch position calculating means, and the punch mounting error is calculated by the correction value calculating means based on the actual punch dimensions and the previously input punch dimensions. That is, a correction value is calculated, and in consideration of the correction value, the collision is moved and positioned by the collision positioning control means.

As a result, the punch mounting error is absorbed, and the positioning position of the abutment can be accurately obtained, so that the effect of improving the processing accuracy of the work is achieved.

Also, instead of providing a limit switch, a contact is provided between the abutment and the punch to form a switch for detecting the contact state between the abutment and the punch. Therefore, unlike the limit switch, it does not hinder the work of the workpiece. There is also an effect.

[0066]

[Brief description of the drawings]

FIG. 1 is an overall view showing an embodiment of the present invention.

FIG. 2 is a diagram showing a specific example of the present invention.

FIG. 3 is a flowchart for explaining the operation of the present invention.

FIG. 4 shows an actual punch position B ′ and a correction value C according to the present invention.
It is a figure showing an example of calculation.

FIG. 5 is a diagram showing a punch mounting error e according to the present invention.

FIG. 6 is a diagram showing an example of abutting positioning control according to the present invention.

FIG. 7 is an explanatory diagram of a conventional technique.

[Explanation of symbols]

 1, 2 contacts 3 abutment 4 body 5 stretch 6 post 7 nut 8 ball screw 9 upper table 10 lower table 11 supporter 12 rack 14 ball screw 15 pinion 16 nut 17 insulating member 20 contact detecting means 21 NC 21A control means 21B punch position Calculation means 21C Correction value calculation means 21D Abutment positioning control means 21E Storage means D Die D P Punch S1, S2, S3, S4 Signal SW Switch W Work

Claims (4)

[Claims] 1. A bending apparatus for bending a workpiece by vertically moving one of a punch mounted on an upper table and a die mounted on a lower table. A punch position calculating means which is activated when it comes into contact with the punch and calculates an actual punch position based on the moving distance of the abutment, and positioning the abutment based on the actual punch position and a previously input punch position. A bending apparatus comprising: a correction value calculating means for calculating a correction value in the case of performing; and a butting positioning control means for positioning a butting at a predetermined position based on the correction value. 2. A switch comprising each contact is provided by providing a contact to the abutment and the punch, and when the abutment contacts the punch, the switch is turned on and the punch position calculation means is activated. Bending equipment. 3. A contact detecting means is provided between the switch and the punch position calculating means, and when the switch is turned on,
3. The bending apparatus according to claim 2, wherein an activation signal is output from the contact detection means, and the punch position calculation means is activated. 4. The bending apparatus according to claim 2, wherein the butting is insulated by an insulating member.