JP2010149133A - Working machine, and method for measuring workpiece by the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To carry out the dimensional inspection of a product while machining a workpiece, and to reflect the result of the inspection to the product. <P>SOLUTION: A working machine 1 executes the machining consisting of predetermined processes of a workpiece W. The working machine 1 includes a workpiece measuring means 61 for measuring the dimension of a part to be machined while maintaining the state of installation of the workpiece W after the machining, a corrective information acquiring means 67 for acquiring corrective information for the part to be machined based on the result of measurement by the workpiece measuring means 61, and a machining control means 66 for performing the control of the working machine 1. The machining control means 66 machines the workpiece W based on corrective information acquired by the corrective information acquiring means 67. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a processing machine and a workpiece measuring method using the processing machine, and more particularly, to a processing machine and a processing machine that measure a processing portion during processing of a product and correct the processing of the workpiece based on measurement information of the measurement. The present invention relates to a workpiece measurement method.

  Conventionally, generally in the case of a bending machine, the measurement of the flange length of the workpiece and the bending angle of the flange is performed after the automatic operation ends. Alternatively, the workpiece is taken out from the bending machine during the automatic operation and measured.

  The operator corrects the flange length correction and bending angle correction data. At this time, a measuring instrument is used to measure the workpiece. For example, a caliper is used for the length of the flange, and a protractor is used for the angle of the flange.

See also Patent Document 1.
JP2007-114000

  The measurement of the workpiece according to the above bending machine has the following problems. When the product is completed from the workpiece, there is a problem that there is a part that is difficult to measure (for example, a bent flange or the like becomes an obstacle and the measuring device cannot be applied to the measurement location).

  If the workpiece is taken out from the bending machine during the machining of the workpiece, the subsequent bending process becomes difficult because the installation position is out of alignment by re-installation. Or, once taken out, there is a problem that the workpiece is handled as scrap. That is, if the workpiece is taken out from the bending machine, it takes time to set the workpiece again, and it is difficult to ensure the machining accuracy.

  For this reason, there is a problem that it takes a lot of work or takes time to make the work into a product. In addition, when there are multiple processes of workpieces, there is a problem that input errors may occur when inputting correction data in each process (such as inputting correction data in a different process). On the other hand, there was a problem that a measuring instrument was necessary.

  An object of the present invention is to improve product accuracy and improve productivity (from inline measurement to correction of products) in an L bending machine.

  The present invention has been made in view of the above-described problems. The invention according to claim 1 is a processing control unit that controls the processing machine in a processing machine that performs processing of a plurality of predetermined steps on a workpiece. And a workpiece measuring means for measuring the dimensions of the machining location while maintaining the installation state of the workpiece on the machining machine in the intermediate process.

  The invention according to claim 2 is provided with correction information acquisition means for acquiring correction information for a machining location based on a measurement result by the workpiece measurement means, and the machining control means is based on the correction information acquired by the correction information acquisition means. The processing machine according to claim 1, wherein the workpiece is processed.

  According to a third aspect of the present invention, the workpiece measuring means includes a mold for machining the workpiece, and a contact position is obtained by bringing the mold into contact with the workpiece and a machining dimension is calculated from the contact position. Item 3. The processing machine according to Item 1 or 2.

  The invention according to claim 4 is the processing machine according to claim 3, wherein the workpiece measuring means includes an image pickup device that picks up an image of a processing portion, and specifies the contact position based on the picked-up image.

  According to a fifth aspect of the present invention, the machining is a bending process, and the workpiece measuring means measures the length of the flange after the machining and the bending angle of the flange. The processing machine according to claim 1.

  The invention according to claim 6 is a method for measuring a workpiece by a processing machine that performs processing including a plurality of predetermined steps on the workpiece, the processing control step for controlling the processing machine, and the processing of the workpiece in an intermediate step. It is a workpiece measuring method by a processing machine which has a workpiece measurement process which measures the size of a processing part, maintaining the installation state to a machine.

  According to the present invention, a processing machine is used to measure a flange dimension and a flange angle (measured while maintaining the installation state of the workpiece on the processing machine) using a processing die for each processing step of the workpiece. Since the desired product is finished, the product accuracy is improved.

  Since the part that cannot be measured after the bending process is finished is measured in the middle of the process (measured while maintaining the installation state of the workpiece on the processing machine), the product accuracy is improved.

  Furthermore, there is an effect that productivity of processing in the bending machine is improved. That is, measuring and correcting in-line for each process leads to a reduction in scraps and the like, and since the accuracy can be obtained in a short time, it is possible to immediately shift to production.

  Embodiments of the present invention will be described with reference to the drawings. Please refer to FIG. One embodiment of the bending machine (L bending machine etc.) 1 as an example of the processing machine which concerns on this invention is shown.

  The bending machine 1 according to the embodiment of the present invention is provided with, for example, a lower clamp beam 3 as a lower frame of the processing machine main body, and a support bracket 5 provided on the upper side of the lower clamp beam 3 is pivoted. For example, an upper clamp beam 9 as a ram is provided so as to be swingable in the vertical direction (Y-axis direction) in FIG.

  A lower front plate 11 is provided at the front portion (left side position in FIG. 1) of the lower clamp beam 3, and the upper surface of the lower front plate 11 extends in the left-right direction (Z-axis direction in FIG. 1). For example, a bottom die 13 is provided as a fixed mold. An upper front plate 15 is fixed to the front portion of the upper clamp beam 9, and a replaceable top die 17, for example, as a movable mold facing the bottom die 13 is provided below the upper front plate 15. . A mold exchanging unit (not shown) is provided at a substantially central portion of the top die 17.

  The lower clamp beam 3 includes a servo motor 19 (including an encoder (not shown)) that swings the upper clamp beam 9 in the vertical direction in order to clamp and unclamp the workpiece W in cooperation with the bottom die 13 and the top die 17. A ram vertical drive device (not shown) is provided.

  In FIG. 1, a bending mold holder 21 extending in the Z-axis direction is attached to the left side so as to be movable up and down (Y-axis direction) using a servo motor (including an encoder) (not shown) as power. Further, the bending holder 21 is configured to be movable in the X-axis direction via a drive shaft 29, a transmission link 31, and a bend beam 33 by using a servo motor 27 (including an encoder not shown) as power. Thereby, the movement amount of the XYZ axes of the upper bending mold 23 and the lower bending mold 25 is calculated, and the coordinates after the movement can be calculated by setting the reference position. Details will be described later.

  The bending mold holder 21 is provided with an upper bending mold 23 that bends the protruding portion of the work W upward and a lower bending mold 25 that bends the protruding portion of the work W downward. The upper bending mold 23 and the lower bending mold 25 are extended in the Z-axis direction.

  The bending machine 1 configured as described above operates as follows. The bend beam vertical drive device that swings the bending mold holder 21 in the vertical direction (Y-axis direction) is powered by a bend servomotor (not shown). Then, the bending die holder 21 is swung upward so that the height position of the tip of the upper bending mold 23 is substantially the same as the height position of the upper surface of the bottom die 13. Further, the workpiece W is positioned at a predetermined position on the bottom die 13 and the workpiece W is clamped and fixed.

  With the workpiece W clamped and fixed, the bending die holder 21 and the upper bending die 23 are further swung upward, so that the workpiece W protrudes backward from the top die 17 and the bottom die 13. The protruding portion thus bent is bent upward.

  On the other hand, when the protruding portion of the workpiece W is bent downward, the clearance between the lower bending die 25 and the bottom die 13 is adjusted, and the bending die holder 21 is swung downward by a bend servomotor (including an encoder not shown). By moving, the lower bending mold 25 is swung downward and bent.

  The bending machine 1 is provided with an imaging device 41 that images the workpiece W. The imaging device 41 includes a CCD camera 43 and support means 45 that supports the CCD camera 43.

  A data communication cable 47 is connected to the CCD camera 43, and the data communication cable 47 is connected to a processing machine control device 49.

  The processing machine control device 49 is composed of a computer, and includes means such as a CPU and memories such as RAM and ROM (not shown).

  The processing machine control device 49 controls the processing of the bending machine 1, and includes an image display means 51 for displaying an image taken by the CCD camera 43, an operation button for the bending machine 1, and the like. Is provided, and a control means 55 for controlling the bending machine 1 is provided.

  Please refer to FIG. The control means 55 includes an image processing means 57, a contact position specifying means 59, a product measuring means 61 (an angle calculating means 63, a flange length calculating means 65), a correction information acquiring means 67, and a processing control means 66. I have.

  The image processing unit 57 displays the image on the image display unit 51 by receiving the imaging data DT generated by the CCD camera 43 and performing predetermined data processing.

  The contact position specifying means 59 is a means that functions when obtaining the flange length and the bending angle of the flange processed into the workpiece W. Specifically, it is means for calculating and specifying the contact position between the upper bending mold 23 provided on the bending mold holder 21 and the workpiece W. Furthermore, it is a means for calculating and specifying the position of the contact point between the lower bending mold 25 for bending the protruding portion of the work W downward and the work W. More specifically, the amount of movement by a servo motor (19, 27, etc.) that moves the bending die holder 21 (upper bending die 23, lower bending die 25) is obtained by each encoder. Then, by setting the reference position and adding the movement amount to the reference position, the coordinates after movement are calculated.

  The product measuring unit 61 includes an angle calculating unit 63 that calculates a flange angle and the like processed on the workpiece W, and a flange length calculating unit 65 that calculates the length of the flange formed on the workpiece W. That is, the dimension after processing is calculated from the position specified by the contact position specifying means 59.

  The correction information acquisition unit 67 acquires a value such as a spring back based on the measurement of the processing portion of the workpiece W, and determines the processing considering the spring back.

  The machining control means 66 controls the machining of the workpiece W in the actual bending machine 1 with the corrected machining content.

  Please refer to FIG. Here, a basic (overall) flow of workpiece measurement at a location where the workpiece W is machined is shown.

  First, in step S301, a program is input and created (the position of the workpiece W and the position of the mold are calculated). Specifically, the control means 55 first specifies the position of the workpiece W as a reference and the positions of the upper bending mold 23 and the lower bending mold 25 based on the description contents of the program. As a result, the amount of movement of the workpiece W before bending on the XYZ coordinates and the reference position is calculated by an encoder or the like provided in the servo motor, and the positions where the upper bending die 23 and the lower bending die 25 have moved are specified. can do.

  In step S303, the process of the control means 55 is started based on the operation of the operation means 53, and the bending process is started by automatic operation. At this time, the initial value of the process “n = 0” is set in the memory by the control means 55.

  In step S 305, the bending process in the “n = n + 1” step is executed under the control of the bending machine 1 by the control means 55.

  In step S307, it is determined whether or not the dimension of the machining location is to be measured. When it is determined that the measurement is to be performed, the process proceeds to step S309. When it is determined not to measure, the process proceeds to step S311. The operation means 53 is operated based on the operator's judgment as to whether or not to measure. Further, a process to be measured in advance may be determined and registered in the memory for automatic operation.

  In step S309, the measured value is fed back. For example, the machining program is modified so that the springback amount is obtained by bending and the machining considering the springback amount can be performed. Thereafter, the process proceeds to step S311.

  In step S311, the control unit 55 determines whether or not the bending process in the plurality of steps is finished. When it is determined that the bending process is complete, the process proceeds to step S313. When it is determined that the bending process has not been completed, the process returns to step S305. Subsequently, in step S313, the product obtained by processing the workpiece W from the bending machine 1 is carried out.

  FIG. 4 shows the operation of the angle measurement process.

  First, in step S401, it is determined whether or not the angle calculating means 63 provided in the product measuring means 61 measures the angle of the flange bent by the upper bending mold 23 or the lower bending mold 25. Do. When it is determined that the flange angle is to be measured, the process proceeds to step S403. When it is determined that the flange angle is not measured, the process proceeds to step S405.

  A method for measuring the angle of the flange of the angle calculation means 63 will be described with reference to FIGS. Using the upper bending mold 23 or the lower bending mold 25, the coordinate positions of the two points brought into contact with the workpiece W are calculated. Here, the amount of X, Y movement by which the upper bending die 23 or the lower bending die 25 is moved between two points by the function of the encoder provided in the servo motor for controlling the upper bending die 23 or the lower bending die 25. To calculate the coordinate positions of the two points.

  This amount of movement is between the measurement points at which the operator visually positioned the mold while viewing the image displayed by the CCD camera 43.

  Then, the angle of the flange is calculated from the X and Y coordinates. At this time, the springback data is also acquired. Furthermore, additional bending is performed in-line as necessary. In other words, the workpiece installation state on the bending machine 1 after machining is maintained and the dimensions of the machining location are measured.

  Here, the images of the workpiece W, the upper bending die 23 or the lower bending die 25, the bottom die 13, and the top die 17 captured by the CCD camera 43 are enlarged and displayed on the image display means 51. Thereby, the contact position to the workpiece | work W of the upper bending metal mold | die 23 or the lower bending metal mold | die 25 to a flange can be pinpointed correctly.

  The calculation method by the angle calculation means 63 will be described in detail with reference to FIG. As a way of thinking about the coordinates, A [origin] (x, y) = (0, 0) on the outer shape of the workpiece W is set. The upper bending die 23 or the lower bending die 25 is moved to obtain the coordinates of point B on the outer shape of the workpiece W: (x, y) = (Bx, By). Further, the upper bending die 23 or the lower bending die 25 is moved to another location, and the coordinates of C point on the outer shape of the workpiece W: (x, y) = (Cx, Cy) are obtained. α: α can be obtained by tan (180 ° −α) = (By−Ay) / (Bx−Ax) where the angle is the product (flange). The actual bent angle is (180 ° −α). Although the coordinate values (Bx, By) are used here, the coordinates (Cx, Cy) may be used instead.

  In step S403, it is determined whether or not to perform measurement value feedback. Here, feedback includes, for example, obtaining a springback amount by bending and correcting the machining program so that machining can be performed in consideration of the springback amount. When it is determined that the measurement value is to be fed back, the process proceeds to step S407. When it is determined that feedback is not performed (when the target value is reached), the process proceeds to step S405.

  In step S405, the process proceeds to the next step. That is, in a plurality of predetermined machining steps, the process proceeds to the next machining step after the current machining step.

  In step S407, an arbitrary process is corrected based on the data to be fed back obtained in step S403. For example, the machining program is modified so that the springback amount is obtained by bending and the machining considering the springback amount can be performed. Furthermore, when similar machining exists at a plurality of locations (processes), all data locations of the machining program are corrected for the corresponding steps. This correction is performed by the operator. It is also possible to register the same bent portion in the memory in advance and automatically correct it.

  In step S409, the process proceeds to the next step. That is, in a plurality of predetermined machining steps, the process proceeds to the next machining step after the current machining step.

  Please refer to FIG. The measurement process of the length of the flange (right angle) by the flange length calculation means 65 is shown.

  In step S701, the flange length calculating means 65 provided in the product measuring means 61 determines whether or not to measure the flange (right angle). When it is determined that the flange (right angle) is to be measured, the process proceeds to step S703. When it is determined that the measurement of the flange (right angle) is not performed, the process proceeds to step S705.

  A method for measuring the length of the flange of the flange length calculating means 65 will be described with reference to FIGS. Two points on the outer shape of the workpiece W are measured using the upper bending die 23 or the lower bending die 25. The X and Y coordinates of the movement of the upper bending mold 23 or the lower bending mold 25 are calculated by the function of the encoder provided in the servo motor that controls the upper bending mold 23 or the lower bending mold 25.

  This amount of movement is between the measurement points at which the operator visually positioned the mold while viewing the image displayed by the CCD camera 43.

  Here, one of the measurement points is set as a measurement origin (for example, a known origin). Then, the other point of the workpiece W is measured using the upper bending mold 23 or the lower bending mold 25. Thus, the flange dimension is calculated from one known point and the other measured point.

  That is, the length of the flange is calculated from the two X and Y coordinates. Here, the images of the workpiece W, the upper bending die 23, the lower bending die 25, the bottom die 13, and the top die 17 captured by the CCD camera 43 are enlarged and displayed on the image display means 51. Thereby, the length of the flange can be accurately measured.

  The calculation method by the flange length calculation means 65 will be described in detail with reference to FIG. The concept of coordinates is set to A [origin] (x, y) = (0, 0) (known). The upper bending mold 23 or the lower bending mold 25 is moved to obtain the coordinates of point E: (x, y) = (Ex, Ey). D: Assuming that the length of the product (flange) is D = Ey, the flange length can be obtained.

  In step S703, it is determined whether or not to feed back the measurement value. If it is determined that the measurement value is to be fed back, the process proceeds to step S707. If it is determined that no feedback is to be performed, the process proceeds to step S705.

  In step S705, the process proceeds to the next step. That is, in a plurality of predetermined machining steps, the process proceeds to the next machining step after the current machining step.

  In step S707, data correction of an arbitrary process is performed based on the data to be fed back obtained in step S703. This correction is performed by the operator. It is also possible to register the same bent portion in the memory in advance and automatically correct it.

  In step S709, the process proceeds to the next step. That is, in a plurality of predetermined machining steps, the process proceeds to the next machining step after the current machining step.

  Please refer to FIG. The measurement process of the flange (obtuse angle) length by the flange length measuring means 65 is shown.

  In step S1001, the flange length calculation means 65 provided in the product measurement means 61 determines whether or not to measure the flange (obtuse angle). When it is determined that the measurement of the flange (obtuse angle) is performed, the process proceeds to step S1003. When it is determined that the measurement of the flange (obtuse angle) is not performed, the process proceeds to step S1005.

  A method for measuring the length (obtuse angle) of the flange of the angle calculation means 63 will be described with reference to FIGS. 11 and 12. Two points on the outer shape of the workpiece W are measured using a mold. The X and Y coordinates of the movement of the upper bending mold 23 or the lower bending mold 25 are calculated by a servo motor (encoder function) that controls the upper bending mold 23 or the lower bending mold 25.

  This amount of movement is between the measurement points at which the operator visually positioned the mold while viewing the image displayed by the CCD camera 43.

  Then, the length (obtuse angle) of the flange is calculated from the X and Y coordinates. The installation state in the bending machine 1 after processing the workpiece W is maintained, and the dimension of the processing portion is measured. At this time, the springback data is also acquired. Furthermore, additional bending is performed in-line as necessary.

  Here, the images of the workpiece W, the lower bending die 23, the upper bending die 25, the bottom die 13 and the top die 17 captured by the CCD camera are enlarged and displayed on the image display means 51. Thereby, the length of the flange can be accurately measured.

  The calculation method by the flange length calculation means 65 will be described in detail. As a concept of coordinates, the coordinates of F point: (x, y) = (Fx, Fy) are obtained. The upper bending mold 23 or the lower bending mold 25 is moved to another location, and the coordinates of G point: (x, y) = (Gx, Gy) are obtained. If β is an angle (outer angle) of the product (flange), β can be obtained by tan (β) = (Gy−Fy) / (Gx−Fx). Here, cos (β) = (Gx−Fx) / H. Thereby, flange dimension: H can be calculated | required.

  In step S1003, it is determined whether or not to feed back the measurement value. If it is determined that the measurement value is to be fed back, the process proceeds to step S1007.

  In step S1005, the process proceeds to the next step. That is, in a plurality of predetermined machining steps, the process proceeds to the next machining step after the current machining step.

  In step S1007, data correction of an arbitrary process is performed based on the data to be fed back obtained in step S1003. This correction is performed by the operator. It is also possible to register the same bent portion in the memory in advance and automatically correct it.

  In step S1009, the process proceeds to the next step. That is, in a plurality of predetermined machining steps, the process proceeds to the next machining step after the current machining step.

  Please refer to FIG. The correction information acquisition means 67 shows the operation of the springback measurement process.

  In step 1301, the correction information acquisition unit 67 sets the initial bending to (target angle + 1 °) in order to approach the target angle while performing follow-up bending. Thereby, springback can be acquired.

  In step S1303, the angle calculation means 63 measures the actual flange angle using the upper bending mold 23 or the lower bending mold 25.

In step S1305, the correction information acquisition unit obtains the springback amount (I) by the following equation.
Formula: Springback amount (I) = (actual angle) − (target angle + 1 °)

  In step S1307, the upper bending die 23 or the lower bending die 25 is moved to a position where the angle calculation means 63 (operator's operation or automatic operation) becomes [target angle- (I)].

  In step S1309, the angle calculation means 63 measures the actual angle using the upper bending mold 23 or the lower bending mold 25.

  In step S1311, the angle calculation unit 63 determines whether the target angle has been reached. When it is determined that the target angle has been reached, the process proceeds to step S1313. If it is determined that the target angle has not been reached, the process returns to step S1305.

  In step S1313, the correction information acquisition unit 67 feeds back the springback amount (I) to an arbitrary step among a plurality of preset steps.

  In step S1315, the process proceeds to the next step. That is, in a plurality of predetermined machining steps, the process proceeds to the next machining step after the current machining step.

  Note that the processing of steps S1309, S1311, and S1313 is performed by the operator, but can also be performed automatically.

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

  For example, the computer program is configured as follows.

In a computer program for controlling a processing machine that performs processing consisting of a predetermined process on a workpiece,
On the computer,
A workpiece measuring means for maintaining the installed state of the workpiece W after machining and measuring the dimensions of the machining portion;
Correction information acquisition means for acquiring correction information for a machining location based on a measurement result by the workpiece measurement means;
Processing as a processing control means for controlling the processing machine;
Furthermore, the computer program for making the said process control means perform the process of the said workpiece | work based on the correction information acquired by the said correction information acquisition means.

  Further, the computer program may be recorded on a recording medium.

It is the schematic which shows schematic structure of a bending machine. It is the schematic which shows the control structure of a bending machine. It is a flowchart which shows the basic operation | movement of product measurement. It is a flowchart which shows the operation | movement of an angle measurement process. It is explanatory drawing explaining an angle measurement process. It is explanatory drawing explaining an angle measurement process. It is a flowchart which shows the operation | movement of a flange (right angle) measurement process. It is explanatory drawing explaining a flange (right angle) measurement process. It is explanatory drawing explaining a flange (right angle) measurement process. It is a flowchart which shows the operation | movement of a flange (obtuse angle) measurement process. It is explanatory drawing explaining a flange (obtuse angle) measurement process. It is explanatory drawing explaining a flange (obtuse angle) measurement process. It is a flowchart which shows the operation | movement of a springback measurement process.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Bending machine 3 Lower clamp beam 5 Support bracket 7 Pivot 9 Upper clamp beam 11 Lower front plate 13 Bottom die 15 Upper front plate 17 Top die 19 Servo motor 21 Bending die holder 23 Upper bending die 25 Lower bending die 27 Servo Motor 29 Horizontal drive shaft 31 Transmission link 33 Bend beam 41 Imaging device 43 CCD camera 45 Support means 47 Data communication cable 49 Processing machine control device 51 Image display means 53 Operation means 55 Control means 57 Image processing means 59 Contact position specifying means 61 Product measurement means 63 Angle calculation means 65 Flange length calculation means 66 Processing control means 67 Correction information acquisition means

Claims (6)

In a processing machine that performs processing consisting of multiple predetermined steps on a workpiece,
Processing control means for controlling the processing machine;
A processing machine comprising: a work measuring means for measuring a dimension of a processing portion while maintaining an installation state of the work on the processing machine in an intermediate process. Correction information acquisition means for acquiring correction information for a machining location based on a measurement result by the workpiece measurement means;
The processing machine according to claim 1, wherein the processing control unit processes the workpiece based on the correction information acquired by the correction information acquisition unit.   The workpiece measuring means includes a mold for processing the workpiece, and obtains a contact position by bringing the mold into contact with the workpiece and calculates a machining dimension from the contact position. 2. The processing machine according to 2.   The processing machine according to claim 3, wherein the workpiece measuring unit includes an image pickup device that picks up an image of a processing portion, and specifies the contact position based on the picked up image.   The said process is a bending process, The said workpiece | work measurement means measures with respect to the length of the flange after a process, and the bending angle of the said flange, The any one of Claim 1 thru | or 4 characterized by the above-mentioned. The processing machine as described in. A workpiece measuring method by a processing machine that performs processing consisting of a plurality of predetermined steps on a workpiece,
A process control step for controlling the processing machine;
A workpiece measuring method using a processing machine, comprising: a workpiece measuring step of measuring a dimension of a processing location while maintaining an installation state of the workpiece on the processing machine in an intermediate process.

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