JP3242694B2 - Work bending angle measuring 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 work bending angle measuring device provided in a press brake, for example, as a bending device.

[0002]

2. Description of the Related Art Conventionally, various types of work bending angle measuring devices in a bending device for performing a long bending process such as a press brake have been known.

First, there is known an apparatus for measuring a desired bending angle by bending a work while measuring a pressing force of a punch or a die.

[0004] Second, there is also known an apparatus provided with a pin-type sensor which can be freely projected and immersed in a V groove of a die.

[0005]

In a bending apparatus for performing a long bending work, such as a press brake, which is known in the prior art, a first apparatus as a work bending angle measuring apparatus includes a work. There is a problem that the method cannot be applied if the sheet thickness varies.

In the second device, the measurement can be performed only at the V-groove width of the die. In other words, since this portion is where R is formed at the corner of the bent work, it is difficult to measure where there is no influence of this R, and there is a problem that it is difficult to measure an accurate bending process. .

In view of the above problems, an object of the present invention is to provide
When bending a workpiece with a bending device, it is possible to measure the bending angle at arbitrary multiple points on the bending device in the length direction of the long workpiece, and it is possible to measure variations in the thickness of the workpiece and bending. An object of the present invention is to provide a workpiece bending angle measuring device which is not affected by R.

[0008]

In order to achieve the above object, the present invention provides a die which is divided into an appropriate number in the horizontal direction and is movable, and a punch provided at a position corresponding to the die. A work bending angle measuring device provided in a bending device for bending a work in cooperation with the die, wherein the die moving means is movable and engageable in parallel with the die, and is movable in parallel with the die. And can freely enter between the die opened by the die moving means,
Further, an X-link that can move up and down from below the work bent by the bending device and detects the opening amount of the work so as to be brought into contact with both sides of the work bordering on the bending line of the work to obtain an actual bending angle. And a work opening amount detecting means having an expression detecting tool.

[0009]

In the above arrangement, first, after bending the work in cooperation with the punch provided at the position corresponding to the die, the die moving means is moved in the left and right direction parallel to the die. With the die. Thus, when the die moving means is moved in parallel with the die,
There is a gap between the dies.

Next, after the work opening amount detecting means having the X-link type detecting tool is inserted into the gap, the work opening amount detecting means is lifted up, and the lower side is formed on both sides of the bent line of the above-mentioned bent work. The X-link type detector is made to abut more. Then, from the opening state of the X-link type detection tool, the work opening amount detecting means measures the actual opening amount of the work, that is, the bending angle of the work.

[0011]

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

Referring to FIGS. 5, 1 and 2, an outline of a bending apparatus 1 for bending a long work W such as a press brake and a work bending angle measuring apparatus 3 will be described.
Will be described.

First, referring to FIG. 5, a ram 7 is provided on a front upper portion of a side frame 5 erected on the floor surface G on the left and right by a hydraulic device 9 so as to be vertically movable. A bed 11 is provided on the floor G at the lower part of the front surface. A mounting member 13 is provided below the ram 7.
A punch 15 is provided with the machined surface facing downward via.
A die 17 having a processing surface facing upward is provided on the bed 11 via a die holder 19 and a slide base 21. Therefore, the bending process is performed by pushing the ram 7 downward while clamping the work W by the cooperation of the punch 15 and the die 17.

More specifically, the die holder 19 is divided into a plurality of parts in the left-right direction.
A plurality of gaps 25 are provided so that (see FIG. 1) can enter and exit in the front-back direction. Similarly, the slide base 21 is also divided into a plurality, and a plurality of gaps 27 are provided so that the work opening amount detecting means 23 can enter and exit in the front-back direction. As shown in FIG. 1, a long groove 29 extending in the left-right direction is provided on the lower surface of the slide base 21.
A slide groove 31 extending in the left-right direction and having an opening surface facing upward is provided on the upper portion of the slide base 21.
And can be moved left and right. further,
An appropriate number of bolts 33 are provided on the lower surface of the die 17 through spacers 35 from below the long groove 29 so that the die 17 does not protrude upward. Further, the spacer 35 is provided movably to the left and right in an appropriate number of long holes 37 provided in the bottom of the long groove 29 of the slide base 21 so as to extend in the left and right direction.

On the other hand, as shown in FIG. 5, the die 17 is divided into a plurality (five in this embodiment) in the left-right direction, that is, divided into dies 17A, 17B, 17C, 17D and 17E from the left. , 17E are provided with a total of two hook holes 39 on the left and right sides respectively. Further, as shown in FIG. 1, the openings are directed upward at the upper portions of the respective dies 17A,.
A holding groove 41 extending in the left-right direction is provided, and a work lifter 45 is provided by being urged upward through an appropriate number of springs 43. The work lifter 45 is connected to the die 1
For example, a pin 47 is provided so as not to move from side to side with respect to 7. Further, a V-groove 49 is formed on the upper portion of the work lifter 45 so as to extend to the left and right to engage with the shape of the lower end of the punch 15.

On the other hand, the bed 11 on the front side of the die 17
A die moving means 51 is provided on the upper side as shown in FIGS. That is, the X-axis carriage 53 is provided movably in parallel with the die 17 while being guided by guide rails extending in the left-right direction. This X-axis carriage 53
Is provided with a ball screw 55 extending in the left-right direction. This ball screw 55 is used for the timing belt 5
7, and is rotationally driven by a servo motor 59. Further, the X-axis carriage 53 is provided with a cylinder 63 in which a piston rod is directly used as a shot pin 61 at such a height as to engage the hook hole 39 via a support base 65.

According to the above configuration, as shown in FIG. 5, the work W is placed on the work lifter 45 in a state where the divided dies 17A,... Device 9
Is appropriately operated to lower the ram 7, and the work W is bent by cooperation of the punch 15, the die 17, and the work lifter 45.

Next, after the workpiece W is subjected to the first-stage bending as described above, the ram 7 is raised to a predetermined position.
The specified position means that the work W and the work lifter 45 are raised by the urging force of the spring 43 as the ram 7 is raised, but the load is not applied to the work W soon. This position is the above specified position.
At this time, the work W is lightly held between the punch 15 and the work lifter 45, but the bent angle is slightly returned due to the elasticity of the work W, and has the same bending angle as when the work W is taken out.

Next, in order to measure the bending angle of the work W, the die 17 and the work lifter 45 are appropriately moved so that the work opening amount detecting means 23, which will be described in detail later, can be advanced and inserted below the place to be measured. A gap following the gap 27 of the slide base 21 is formed in a suitable place. Therefore, the X-axis carriage 53 is moved right and left by appropriately operating the servo motor 59, and the shot pin 61 is moved to the die 1 for example.
After being positioned in the catching hole 39 of 7E, the piston rod of the cylinder 63, that is, the shot pin 61 is protruded to engage with the catching hole 39. Then, when the servomotor 59 is operated again to slightly move the X-axis carriage 53 rightward, the die 17E moves rightward, and a little gap is formed between the die 17E and the die 17D. Next, after retracting the shot pin 61, the shot pin 61 is engaged with the hook hole 39 of the die 17D and slightly moved leftward by performing the same operation as described above, and the dies 17A,. Moving. Then, together with the work lifter 45, the die 17D and the die 17E
5, a gap having the same width as the gap 27 of the slide base 21 is formed, so that the work opening amount detecting means 23 can enter, and the work W is bent above the rightmost gaps 25 and 27 in FIG. Angle can be measured. By repeating the same operation as described above, the bending angle of the work W above the remaining gaps 25 and 27 is successively measured.

Next, the work opening amount detecting means 23 will be described in detail with reference to FIGS. 1, 2, 3 and 4. However, the X-link detector 67 in FIGS. 1 and 2 is a single type, while the X-link detector 69 in FIG. 3 is a double type.

First, a Y-axis carriage 71 is provided on an X-axis carriage 53 which is movable in the left-right direction in parallel with the die 17 and which is movable in the front-rear direction and can enter under the work W. The Y-axis carriage 71 has an X-axis carriage 53
It is driven by being linked to a piston rod 75 of a cylinder 73 provided above. Furthermore, Y
The shaft carriage 71 is provided with a lifting cylinder 77, and a base plate 81 is supported on the upper end of a piston rod 79 of the lifting cylinder 77 so as to be vertically movable.
An X-link detector 67 or an X-link detector 69 is mounted on the base plate 81. The X-link detector 69 is provided such that upper X-links having different arm lengths are shifted left and right at appropriate intervals so as not to interfere with each other. Except that the angle measurement can be performed at a plurality of points (two points in the embodiment shown in FIG. 3), since it is basically the same as the X-link type detector 67, it will be described at the same time.

The X link 83 has a lower portion provided at a central portion of the first link 89 which is pivotally instructed by a fixing pin 87 supported by a support bracket 85 provided on the base plate 81. A second link 93 supported by the center pin 91 so as to freely open and close is provided in a pair in an X shape. The upper ends of the first and second links 89 and 93 are in contact with the tip of the arm bent inward in FIGS. A child 95 is provided. A slider 97 is fixedly provided at the lower end of the second link 93.

On the base plate 81 below the second link 93, a measured quantity converter 99 is provided.
In the measured quantity converter 99, a resistor 101 which is a main part as a potentiometer, a battery 103 electrically connected to both ends of the resistor 101, and a battery 10
3, a negative terminal 105 connected to the negative electrode, the slider 97 slidingly in contact with the resistor 101, and a positive terminal 107 electrically connected to the slider 97. Is provided, and the measurement amount conversion device 99 is provided.
As a whole, it functions as a potentiometer.

When the support bracket 85 moves up together with the base plate 81, it is desirable that the X-link 83 comes up in a contracted state so as to cope with a small bending angle of the work W. For this purpose, a center spring 109 is provided for urging the lower portions of the first and second links 89 and 93 by pulling them inward. Further, side springs 111 and 113 which are weaker than the center spring 109 are provided on both sides of the center spring 109 so that the X-link 83 can be raised at an appropriate angle without falling when the support bracket 85 is raised. It is provided. The other ends of the side springs 111 and 113 are swingably supported by pins 115 and 117 supported by a support bracket 85 provided on the base plate 81.

Next, the double-type X-link detector 69 will be described. The double type is the X link 8 mentioned above.
On the right side of FIG.
A longer long arm X-link 83L is provided at the center pin 91 at an appropriate distance via a spacer 119. However, as described later, it is desirable that the spacer 119 has a configuration in which nuts are embedded in both ends of a cylinder made of a flexible material such as hard rubber, and the center pins 91 and 91L are screwed in from the left and right. Anyway, the long arm X link 83L is
Except for the purpose of measuring and measuring the angle of the outer portion in the width direction of the work W as compared with the X link 83, the configuration is the same as that of the X link 83.
Related components are denoted by the same reference numerals and corresponding Sahoox L symbols as the corresponding components in the X link 83 in FIG. 3, and description thereof is omitted.

The minus terminals 105, 105L
In order to recognize the electric quantity V output from the plus terminals 107 and 107L as a potentiometer as a bending angle θ from the characteristic curve of the work opening amount detecting means 23 as shown in FIG. Detecting means 2
3 is provided with a bending angle recognition device 121 including an A / D conversion device. As shown in FIG. 5, the bending angle / recognition device 121 is a floor surface G near the bending device 1.
It is stored in the electric control device 123 provided above. Further, since the work bending angle measuring device 3 of this embodiment has a configuration convenient to be incorporated into an automatic control system, it is a known means, but the electric control device 123 includes the bending angle recognition device 121. In addition, a computing device for averaging a plurality of pieces of angle information, a comparing device for comparing the calculated average angle with a desired angle, and a command for an appropriate ram plunging amount to the hydraulic device 9 based on the comparison value. And a microcomputer CPU for performing the operation.

With the above structure, the work opening amount detecting means 2
The operation of No. 3 will be described. First, as described above, die 17
After forming a gap following the gap 21 provided in the slide base 21 at an appropriate place of the work lifter 45,
The X-axis carriage 53 is moved right and left to position the X-link type detector 67 in the gap formed above.
Thereafter, the Y-axis carriage 71 is moved forward by protruding the piston rod 75 of the cylinder 73,
The X-link detector 67 is positioned directly below the workpiece W.

Then, the piston rod 79 of the elevating cylinder 77 is protruded to raise the support bracket 85 and the fixing pin 87 together with the base plate 81 to a predetermined measurement position. At this time, the X-link 83 rises in a depressed state by the urging force of the center spring 109, and the center pin 91 moves rearward due to the depressed state.
Since it is stronger than 11, the X link 83 rises slightly leaning forward.

In this state, the two contacts 95 are connected to the work W
This is a convenient posture to make both sides contact each other at the boundary of the bending line. If the double-type X-link detector 69 is used, the center pins 91, 91
When L is integrally formed to penetrate the axis of the spacer 119, the first link 89 and the long arm first link 89L have a degree of freedom by the fixing pins 87 and 87L and the center pins 91 and 91L. When the X-link type detector 67 (69) comes up and comes into contact with the front side of the workpiece W, the contact 95 or 95L of the portion having a large bending angle is lost and integrated. If the first contact is made, the other contact 95L or 95 cannot contact. Therefore, as described above, it is desirable that the spacer 119 be a flexible material.

By the way, the X-link 83, which has risen in a slightly forwardly inclined state, comes into contact with the rear (left side in FIG. 1) contact 95 first on the lower rear side of the work W. The front contact 95 supported by the upper end of the first link 89 also comes into contact with the lower front side of the work W while being in the upright state from the slightly inclined state. Furthermore, base plate 8
When the first bracket 1 and the support bracket 85 are raised to the predetermined positions, the X link 83 spreads out against the urging force of the center spring 109, and the bending angle θ can be measured as shown in FIGS.

At this time, the slider 97 mounted on the lower end of the second link 93 is placed at an appropriate position of the resistor 101 which is a main part of the potentiometer, that is, at an open position corresponding to the bending angle of the work W. The negative terminal 105
As shown in FIG. 4, the potential (electric quantity) between the positive terminal 107 and the positive terminal 107 is a potential (electric quantity) corresponding to the bending angle θ of the workpiece W. That is, the opening amount of the X link 83 is converted into an electric amount by the measurement conversion device 99.

The angle signal converted into the electric quantity is transmitted to the electric control unit 123. In the electric control device 123, the bending angle θ is first recognized by the bending angle recognition device 121 from the input electric quantity based on the previously input characteristic curve as shown in FIG.

The angle signal is transmitted to the workpiece W as described above.
Since a plurality of points in the length direction and, in some cases, a plurality of points in the width direction are included, a more accurate bending angle can be recognized by calculating the average value by the calculation device. The corrected bending angle is compared by a microcomputer CPU by a desired bending angle comparison device which is input in advance, and then a correction amount is calculated, and a command is issued to the hydraulic device 9 for the next ram plunge amount. Therefore, the hydraulic device 9 controls the ram 7 with the plunge amount commanded by the feedback.
, The workpiece W is accurately bent to a desired bending angle.

As described above, according to this embodiment, the die 1
7 can be divided into a plurality of parts and a gap can be appropriately formed to perform angle measurement. Therefore, even a long work W can be measured at a plurality of positions, so that an average accurate work bending angle can be detected. It has the effect of saying.

If necessary, an X-link type detector 69 combining a plurality of X-links with different arm lengths can be used, so that a plurality of measurements can be made in the width direction of the work W. Therefore, it is possible to expect even more accurate detection of the work bending angle.

The work opening amount detecting means 23 is provided with X-link type detectors 67 and 69, which can be moved up and down from below the work W, and are provided with contacts on both sides of the work W at the bending line. Since the opening amount of the work is detected by bringing the abutment 95 into contact, the measurement point is not necessarily limited to the V groove 49 of the die 17. Therefore, there is an effect that an accurate bending angle can be measured without the influence of R near the bending line of the work W.

Furthermore, the work W can be measured without removing it from the bending apparatus 1, and the X-link detector 6 can be measured.
Since the opening amounts of 7, 69 are converted into electric quantities by the measured quantity conversion devices 99, 99L and output, automatic control by the electric control device becomes easy. Therefore, improvement of work efficiency and
This is effective for labor saving.

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

For example, in this embodiment, the die moving means 5
1 and the left and right moving means of the work opening amount detecting means 23 are:
Although the common ball screw 55 and the X-axis carriage 53 are used, the use of separate left and right moving means is not a problem.

[0040]

As will be understood from the above description of the embodiment, according to the present invention, the die which is divided and movable in the left-right direction is movable and engageable in parallel with the die. Since a gap is formed in an arbitrary divided portion by the die moving means, the effect of being able to measure the bending angles of any number of places according to the length of the workpiece on the bending machine is effective. is there.

Further, the work opening amount detecting means is provided with an X-link type detecting device, which can move up and down from below the work, and contact the contacts to both sides of the work at the boundary of the work bending line. Since the amount of opening of the work is detected by making it work, there is an effect that an accurate bending angle without the influence of R near the bending line of the work can be measured.

[Brief description of the drawings]

FIG. 1 is a side view of a work bending angle measuring device provided with a bending device, showing a main part of the present invention.

FIG. 2 is an explanatory plan view partially sectioned in FIG. 1;

FIG. 3 is an explanatory view of the principle on the left side of the X-link type detector.

FIG. 4 is an example of a characteristic curve of a work opening amount detecting means.

FIG. 5 is a front view of the bending apparatus in a state where a die moving unit and a work opening amount detecting unit are removed.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bending apparatus 3 Work bending angle measuring apparatus 15 Punch 17 Die 23 Work opening detection means 51 Die moving means 67 X-link type detection tool W Work

Claims (1)

(57) [Claims] 1. A bending device for bending a workpiece by cooperation of a die which is divided and movable in an appropriate number in the horizontal direction and a punch provided at a position corresponding to the die. A work bending angle measuring device, wherein the die moving means is movable and engageable in parallel with the die, and between the die opened by the die moving means and movable in parallel with the die. You can enter freely,
Further, an X-link that can move up and down from below the work bent by the bending device and detects the opening amount of the work so as to be brought into contact with both sides of the work bordering on the bending line of the work to obtain an actual bending angle. A work bending angle measuring device comprising: a work opening amount detecting means having a type detecting tool.