JP2011104635A - Bending device and bending method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain the accurate dimensions of a flange by accurately positioning a workpiece while straightening the camber of the workpiece in a bending device. <P>SOLUTION: In the bending device including a back gage 2 for positioning the workpiece W, the workpiece W positioned by the back gage 2 is bent by the cooperation of a punch P which is mounted on an upper table and a die which is mounted on a lower table. The part contacting with the workpiece of the camber straightening means for straightening the camber of the workpiece W is provided on the back gage 2 and the camber in the vertical direction of the workpiece W is straightened and the bending work is performed by the part contacting with the workpiece of the camber straightening means. Further, by bringing the part contacting with the workpiece of the camber straightening means into contact with the flange of the workpiece W, the camber in the vertical direction of the flange is straightened and the bending work is performed. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a bending apparatus and a bending method, and more particularly to a bending apparatus and a bending method for accurately positioning a workpiece while correcting warpage in the vicinity of the tip of the workpiece (parts) and obtaining a flange having a precise flange size. About.

  Conventionally, a bending apparatus, for example, a press brake, has a punch mounted on an upper table and a die mounted on a lower table. Bending (parts, etc.) At this time, the flange dimension from the bending position (bending line) to the end of the workpiece becomes important. For example, when a development view of a part having a case shape is considered, it includes a bottom surface and a side surface (flange portion). If the dimensions of the flange portion do not match, an accurate case cannot be obtained.

  Prior to the bending process, for example, the workpiece gripped by the robot is pressed against a plurality of (for example, two) potentiometers (butting portions) of the back gauge installed at the rear of the lower table and applied to each potentiometer. The work position is adjusted so that the pressing amount is uniform, and a predetermined bending position is determined.

  For this reason, when the workpiece warpage is large, the potentiometer and the workpiece may not contact each other. In that case, before bending, the warped portion is flattened with a hammer or the like, or the warped portion is corrected by a correcting means. See also Patent Document 1.

JP 2004-237317 A

  As shown in FIG. 9, in the case of a work (parts or the like) having a large warp, the work cannot be brought into contact with a sensor unit installed near the center of the potentiometer. In this case, the workpiece warpage is flattened with a hammer before bending, but in the case of a large workpiece, it takes a lot of time for the work, and the work is also damaged. is there.

  Further, the technique disclosed in Patent Document 1 cannot solve the problem in the case where the part where the work is brought into contact with the potentiometer is greatly warped as shown in FIG. That is, there is a problem that the warpage between the mold and the potentiometer D (flange portion) cannot be corrected.

  Furthermore, in the actual bending operation, the position where the workpiece is set on the mold is often different for each process and the bending program, whereas in the above cited reference 1, a device for preventing warping is installed at the fixed position. Therefore, every time the mold used for machining is changed, unless the installation position of the device for warping is changed, the place where the workpiece is sandwiched is not appropriate, and there is a problem in actual operation.

  The present invention is for solving the above-mentioned problem, and the invention according to claim 1 is a collaboration between a punch positioned on the upper table and a die mounted on the lower table. Accordingly, in the bending apparatus for bending, the back gauge includes a warp correction means for correcting the warp of the workpiece, and the workpiece contact portion of the warp correction means corrects the vertical warp of the workpiece to perform the bending process. It is a bending apparatus to be performed.

  According to a second aspect of the present invention, there is provided a bending apparatus for bending a workpiece positioned by a back gauge in cooperation with a punch mounted on an upper table and a die mounted on a lower table. The bending apparatus includes a warp correction means for correcting, and a workpiece contact portion of the warp correction means abuts on a flange portion of the workpiece to correct a vertical warpage of the flange portion and perform bending.

  The invention according to claim 3 is the bending apparatus according to claim 1, wherein the back gauge is guided so as to be movable back and forth with respect to the bending machine main body and is also guided so as to be movable left and right. .

  The invention according to a fourth aspect is the bending apparatus according to the first, second, or third aspect, wherein the workpiece contact portion of the warp correction means is constituted by a rotatable spherical free bearing.

  The invention according to claim 5 is a bending method in which a workpiece positioned by a back gauge is bent by the cooperation of a punch mounted on the upper table and a die mounted on the lower table. It is a bending method in which a warp correcting means for correcting is provided in the back gauge, and a work contact portion of the warp correcting means corrects a warp in a vertical direction of the work and performs a bending process.

  The invention according to claim 6 is a bending method in which a workpiece positioned by a back gauge is bent in cooperation with a punch mounted on an upper table and a die mounted on a lower table. It is a bending method in which a warp correcting means for correcting is provided, and a workpiece contact portion of the warp correcting means is in contact with a flange portion of the workpiece to correct a vertical warp of the flange portion and perform bending.

  As described above, according to the present invention, in the bending apparatus, the workpiece can be accurately positioned and processed while correcting the warpage in the vicinity of the tip of the workpiece, so that a highly accurate flange dimension can be obtained and the processing efficiency can be improved. There is an effect to improve.

It is the schematic which shows the outline of the press brake of this invention. It is explanatory drawing explaining a free bearing. It is explanatory drawing explaining a free bearing. It is explanatory drawing explaining NC apparatus. It is a flowchart for demonstrating operation | movement of this invention. It is an operation | movement diagram for demonstrating operation | movement of this invention. It is an operation | movement diagram for demonstrating operation | movement of this invention. It is an operation | movement diagram for demonstrating operation | movement of this invention. It is explanatory drawing of a prior art. It is explanatory drawing of a prior art.

  Hereinafter, the present invention will be described with reference to the drawings by embodiments.

  FIG. 1 is a schematic view showing an outline of a bending apparatus of the present invention. FIG. 2 shows a structure in which a warp correction means is attached to the back gauge 2 of the bending apparatus as viewed from the front. FIG. 3 is a side view of the structure in which the warp correction means is attached to the back gauge 2 in FIG.

  In this example, the front-rear (front) direction of the press brake 1 (normal position where the operator performs work) is the Y-axis direction, the left-right (side) direction is the X-axis direction, and the vertical direction is the Z-axis direction. To do.

  The shape of the workpiece W is assumed to be a shape in which the outer shape is a case shape and one bottom surface and four side surfaces are developed. In this example, the four side surfaces will be described as flange portions. As already described, it is very important in manufacturing the product to accurately process the dimensions of the flange portion.

  Please refer to FIG. 1, FIG. 2 and FIG. As a bending apparatus, for example, there is a press brake 1, and, as is well known, it has a punch P mounted on the upper table and a die D mounted on the lower table. This is a descending press brake that performs bending by operating the hydraulic cylinder to lower the upper table.

  Then, a workpiece W having warpage (in this example, a part that is a plate-like part before bending) W is used as a warp correction means (free bearing mounting guides 5U, 5L, piston rods 6U, 6L in this example). As an example of the workpiece contact portion of the free bearings 7U, 7L, nuts 8U, 8L, and air cylinders 9U, 9L), for example, the free bearings 7U, 7L are pressed to flatten the warpage of the flange portion of the workpiece W In a corrected state, the work W is abutted against the potentiometer 2a provided in the back gauge 2 and positioned, and then the free bearings 7U and 7L are opened, and a predetermined bending process is performed by the punch P and the die D.

  Free bearings 7U and 7L, which are examples of the workpiece contact portion of the warp correction means, are attached to a back gauge 2 (in this example, two back gauges are provided, but an appropriate number of back gauges may be provided). Yes. Further, as is well known, the free bearings 7U and 7L are constituted by rotatable spheres. Therefore, as will be described later, when the workpiece W is brought close to the potentiometer 2a and a gauging operation is performed, the workpiece W is a rotatable sphere even if it is pressed by the free bearings 7U and 7L. There is no effect on the gauging operation. Here, the gauging operation refers to an operation for reliably positioning the workpiece W while finely moving the workpiece W so that the position is reliably determined after the workpiece W is abutted against the potentiometer 2a (in other words, an operation for generating a gauging signal). Say).

  On the other hand, the back gauge 2 is guided by a rod-like stretch 3 extending in the X-axis direction, and is configured to be movable in the X-axis direction on the stretch 3. Thus, both ends of the stretch 3 functioning as a guide rail mesh with ball screws (installed at two locations) provided in the body of the press brake 1 using, for example, a servo motor as a drive source. It is configured to be movable and positionable in the Y-axis direction by rotational driving.

  The back gauge 2 is fixed with a free bearing mounting guide 5U that is refracted and extended in the Y-axis direction from the Z-axis through a column fixed by a nut 8U. A rod-like piston rod 6U extending in the Z-axis direction is provided near the end of the free bearing mounting guide 5U. The piston rod 6U moves up and down (in the direction of the arrow AR1) with the air cylinder 9U as a drive source. ) Drive freely. A free bearing 7U is attached to the end of the piston rod 6U.

  Similarly, a free bearing mounting guide 5L extending in the Y-axis direction and fixed by a nut 8L is fixed to the back gauge 2. Near the end of the free bearing mounting guide 5L, a rod-shaped piston rod 6L extending in the Z-axis direction is provided. The piston rod 6L moves up and down (in the direction of the arrow AR2) with the air cylinder 9L as a drive source. ) Drive freely. A free bearing 7L is attached to the end of the piston rod 6L.

  Accordingly, the free bearings 7U and 7L can move in synchronization with the movement of the back gauge 2, and the workpiece W can be pressed at an accurate position and an accurate gauging operation can be performed.

  That is, the workpiece W whose warpage should be corrected by the free bearings 7U and 7L is processed by punching processing or laser processing before bending, and this processing causes a large warpage in the vertical direction. Yes. After a workpiece W having such warpage in the vertical direction is gripped by, for example, a robot and inserted between the punch P and the die D, the air cylinders 9U and 9L are operated to lower and raise the free bearings 7U and 7L, respectively. The flange portion of the workpiece W is pressed from the upper and lower surfaces. Thereby, on the workpiece W, the potentiometer 2a side from the free bearings 7U and L becomes substantially flat, and the warp is corrected.

  Please refer to FIG. The NC device 10 is composed of a computer and includes a CPU 11 and the like. The CPU 11 cooperates with the free bearing control means 12, the potentiometer control means 13, and the bending control means 14.

  The free bearing control means 12 controls the free bearings 7U and 7L, the potentiometer control means 13 controls the vertical movement of the potentiometer 2a, etc., and the bending control means 14 operates the punch P and the like. It is something to control. The air pressure sources 15U and 15L generate air pressure, the switching valves 16U and 16L switch air pressure, and the pressure reducing valves 17U and 17L decrease air pressure.

  Based on the cooperation of the free bearing control means 12, the potentiometer control means 13, the bending control means 14, the pneumatic pressure sources 15U and L15, the switching valves 16U and 16L, and the pressure reducing valves 17U and 17L, the predetermined operation as described above is performed. It becomes possible.

  Further, the potentiometer 2a outputs a gauging completion signal when the workpiece W is positioned. As an example of the potentiometer 2a, for example, there is a linear potentiometer. In the linear potentiometer, the end portion of the workpiece W abuts against the abutting portion, and when the abutting portion is further pushed, the rod is immersed in the casing. . As a result, the sliding piece (not shown) in the housing coupled to the rod moves linearly on the resistor (not shown), so that the resistance value changes. Therefore, the change is converted into a voltage, for example, When it is output as a gauging completion signal and received by the potentiometer control means 13 of the NC apparatus 10 to be described later, it is determined that the workpiece W has been positioned.

  From the characteristic of the potentiometer 2a, as described above, a gauging completion signal is output for the first time when the end portion of the workpiece W comes into contact with the contact portion and is further pushed and moved.

  When the free bearings 7U, L are lowered, the decompressed air is supplied to the upper chambers of the air cylinders 9U, L via a pressure reducing valve. Therefore, the free bearing 2a presses the workpiece W with an extremely small pressing force, and the free bearing 2a is composed of a rotatable sphere as described above, so that the workpiece W is damaged or deformed. There is no effect on the subsequent bending process.

  Further, a robot is installed in front of such a press brake 1, and the robot is, for example, a bending robot, and the bending robot moves in the left-right direction (X-axis direction) along the traveling plate. It has become.

  The operation of the bending apparatus will be described with reference to FIG. First, in step S01, the potentiometer 2a is positioned in the X and Z directions via the back gauge 2 that is movable on the stretch 3 in the X-axis direction under the control of the potentiometer control means 12.

  In step S02, for example, the workpiece W having a large warped flange portion placed by the robot is placed on the die D.

  Please refer to FIG. A workpiece W is placed between the punch P and the die D. And in the flange part of the workpiece | work W, the range shown by the area | region E has big curvature. For this reason, the length F1 from the bending position to the tip of the workpiece W (corresponding to the flange portion) is apparently shorter than the case where there is no warp (length F2). Therefore, if positioning and bending are performed as it is, a flange portion longer than the flange portion having the target length is formed.

  In step S03, the air cylinders 9U and 9L are operated by the control of the free bearing control means 12 to lower the upper free bearing 7U and simultaneously raise the lower free bearing 7L. And the curvature which has generate | occur | produced in the flange part is correct | amended flatly by making it contact | abut on both surfaces of the flange part of the workpiece | work W, and pressing it.

  Please refer to FIG. A workpiece W is placed between the punch P and the die D. In the flange portion of the workpiece W, the free bearings 7U and 7L are in contact with the upper and lower surfaces of the flange portion, so that the warp is corrected and the flat state is obtained. For this reason, the length F2 of the flange portion from the bending position to the tip of the workpiece W is finished to an accurate dimension.

  In step S04, the potentiometer 2a is positioned in the Y direction under the control of the potentiometer control means 13.

  In step S05, the work W gripped by the robot comes into contact with the potentiometer 2a. Please refer to FIG. The potentiometer 2a moves in the direction of the arrow AR5, which is the Y-axis direction, and comes into contact with the tip of the workpiece W. Then, a gauging operation is performed.

  In step S06, it is determined whether or not the potentiometer control means 13 has received a gauging signal. If it is determined that a gauging signal has been received, the process proceeds to step S07. If it is determined that a gauging signal has not been received, the process returns to step S05.

  In step S07, the punch P is brought into contact with the upper surface of the workpiece W under the control of the bending control means 14.

  In step S08, the upper and lower free bearings 7U and 7L and the potentiometer 2a are retracted as controlled by the free bearing control means 12 and the potentiometer control means 13.

  In step S09, the bending process is performed on the workpiece W which is controlled and accurately positioned by the bending control means 14.

  As described above, the work W can be accurately pressed against the potentiometer 2a of the back gauge 2 without correcting the warpage of the work W having a large warp before bending.

  In particular, in a bending system using a robot for gripping the workpiece W, it is difficult to determine the warpage of the workpiece W, and there are many cases where a gauging error occurs and the machining must be stopped, but in the present invention, the warpage is large. The gauging process in the case of the workpiece W can be accurately performed.

  Furthermore, since the contact position is determined corresponding to the setting of the workpiece W on the mold different for each bending program and bending process, it is possible to always eliminate the warpage of the contact portion between the workpiece W and the sensor portion of the potentiometer 2a. become. Thereby, a flange with good dimensional accuracy can be obtained, and there is an effect of improving processing efficiency.

  In the apparatus of the present invention, since the free bearings 7U and 7L move to the gauging target position in synchronization with the potentiometer 2a, it is not necessary to change and set the positions of the free bearings 7U and 7L for each mold bending process / program. There is an effect.

  Further, by directly sandwiching the warped portion (corresponding to the flange portion of the part) of the workpiece W with the potentiometer 2a, the potentiometer 2a and the workpiece W can be reliably brought into contact with each other.

  The present invention is not limited to the embodiments of the invention described above, and can be implemented in other modes by making appropriate modifications.

1 Press brake (bending machine)
2 Back gauge 2a Potentiometer 3 Stretch 4 Ball screw 5U, L Free bearing mounting guide 6U, L Piston rod 7U, L Free bearing 8U, L Nut 9U, L Air cylinder 10 NC device 11 CPU
12 Free bearing control means 13 Potentiometer control means 14 Bending control means 15U, L Pneumatic pressure source 16U, L Switching valve 17U, L Pressure reducing valve P Punch D Die W Workpiece (parts)

Claims (6)

In a bending apparatus for bending a workpiece positioned by a back gauge, in cooperation with a punch mounted on an upper table and a die mounted on a lower table,
A bending apparatus characterized by comprising a warp correction means for correcting a warp of the workpiece in the back gauge, wherein a workpiece contact portion of the warp correction means corrects a warp in the vertical direction of the workpiece and performs a bending process. In a bending apparatus for bending a workpiece positioned by a back gauge, in cooperation with a punch mounted on an upper table and a die mounted on a lower table,
A warp correcting means for correcting the warp of the workpiece, wherein the workpiece contact portion of the warp correcting means abuts on the flange portion of the workpiece to correct the vertical warpage of the flange portion and perform bending. Bending machine.   The bending apparatus according to claim 1, wherein the back gauge is configured to be guided so as to be movable back and forth with respect to the bending machine main body and also to be movable left and right.   The bending apparatus according to claim 1, 2 or 3, wherein the workpiece contact portion of the warp correction means is constituted by a rotatable spherical free bearing. In a bending method in which a workpiece positioned by a back gauge is bent by cooperation with a punch mounted on an upper table and a die mounted on a lower table,
A bending method characterized in that a warp correction means for correcting the warp of the workpiece is provided in the back gauge, and a workpiece contact portion of the warp correction means corrects the warpage in the vertical direction of the workpiece and performs bending. . In a bending method in which a workpiece positioned by a back gauge is bent by cooperation with a punch mounted on an upper table and a die mounted on a lower table,
Warpage correction means for correcting the warpage of the workpiece is provided, and the workpiece contact portion of the warpage correction means contacts the flange portion of the workpiece, and the bending of the flange portion is corrected and corrected. Bending method.

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