JP3908097B2 - Bending machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention improves the accuracy of the flange dimensions and improves workability by checking the contact state between the workpiece and the abutment and accurately positioning the workpiece even when the distance between the punch and the die blade is narrow. The present invention relates to a bending apparatus designed to improve the above.
[0002]
[Prior art]
Conventionally, a bending apparatus, such as a press brake (FIG. 11), has a punch P mounted on the upper table 50 and a die D mounted on the lower table 51, and moves one of the tables up and down. The workpiece W is bent by the cooperation of the punch P and the die D.
[0003]
In this case, prior to bending, the workpiece W is abutted against the back gauge abutments 52 and 53 installed behind the lower table 51, thereby positioning the workpiece W at a predetermined position.
[0004]
[Problems to be solved by the invention]
[0005]
However, in the prior art (FIG. 11), when one process is completed, for example, in the case of a descending press brake, the upper table 50, which is a ram, may be stopped halfway without returning to the upper limit position. .
[0006]
Thereby, by eliminating useless strokes, it is possible to immediately move to the next process, thereby shortening the processing time.
[0007]
However, when the upper table 50 is stopped halfway, the space between the punch P and the die D is narrow, so that it is difficult for the operator to see the contact state between the workpiece W and the abutment 52, 53. I can't confirm.
[0008]
In this case, the NC screen displaying the contact state between the workpiece W and the abutments 52 and 53 does not move with the operator even if the operator moves to the machining station, for example, in the case of step bending. Therefore, the operator may not be able to confirm the contact state of the NC screen because it is difficult to see.
[0009]
As a result, the operator bends the workpiece W in an improper contact state, and only a product with a flange dimension with reduced accuracy can be obtained. Rush 52 , 53 It is difficult to see the abutting state and the work has to be done in an environment with poor workability.
[0010]
The object of the present invention is to improve the accuracy of the flange dimension in a bending apparatus by checking the contact state between the workpiece and the abutment and accurately positioning the workpiece even when the distance between the punch and the die is narrow. And to improve workability.
[0011]
[Means for Solving the Problems]
In order to solve the above problems, the present invention, as shown in FIGS.
(A) In a bending apparatus for bending a workpiece W with a punch P mounted on the upper table 1 and a die D mounted on the lower table 2 by bringing the workpiece W into contact with the abutments 3 and 4;
(B) It is attached to the rear of the upper table 1 so that it can be positioned above the abutments 3 and 4 at the processing stations in each process, Imaging means 9 for imaging the contact state between the workpiece W and the abutments 3, 4; It is attached to the front of the upper table 1 so as to be freely positioned above the worker S in the processing station of each process, The actual image JG in the contact state imaged by the imaging means 9 is Corresponding to the processing station of each process Upper table 1 surface region A technical means called a bending apparatus characterized by having a projecting means 18 for projecting is provided.
[0012]
Therefore, according to the configuration of the present invention, the worker S who has moved to each of the processing stations A1, A2,... An, and the workpiece W projected on the screen that is the surface of the upper table 1 in front of the eyes. Since the actual image JG in contact with the three and four can be viewed (FIG. 5), the contact state can be confirmed even if the gap between the blades is narrow, thereby correcting the inappropriate contact state ( FIG. 8).
[0013]
Furthermore, since the simulation image SG generated based on the product information can be projected on the actual image JG (FIG. 10), in this case, whether the actual image JG and the simulation image SG match each other. Can be automatically determined, and when the two images do not match, an alarm can be displayed, and an inappropriate contact state can be corrected more quickly.
[0014]
As a result, according to the present invention, in the bending apparatus, even when the gap between the punch and the die is narrow, by checking the contact state between the workpiece and the abutment and accurately positioning the workpiece, It becomes possible to improve accuracy and workability.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described with reference to the accompanying drawings by embodiments.
FIG. 1 is an overall view showing an embodiment of the present invention.
[0016]
In FIG. 1, the bending apparatus shown in the figure is, for example, a press brake. The press brake is mounted on the upper table 1 via an intermediate plate 32 and is mounted on the lower table 2 via a die holder 33. In the case of a descending type, for example, the upper table 1 is moved up and down by hydraulic cylinders 5 and 6.
[0017]
And if the hydraulic cylinders 5 and 6 are driven by the bending control means 30L of the lower NC device 30 to be described later, the press brake is positioned in contact with the abutments 3 and 4 as the punch P descends. The workpiece W is subjected to a predetermined bending process by the punch P and the die D.
[0018]
The abutments 3 and 4 (FIG. 2) are provided on a back gauge installed at the rear of the lower table 2, and the abutments 3 and 4 are X-axis motors on the stretch 34 as is well known. The stretch 34 can be moved in the longitudinal direction (X-axis direction) by (not shown), and the stretch 34 is moved back and forth (Y-axis direction) and up-and-down direction (Y-axis direction) by a Y-axis motor (not shown) and a Z-axis motor (not shown). It can move in the Z-axis direction).
[0019]
With this configuration, the bumps 3 and 4 are bent according to the product information (CAD information) (step 101 in FIG. 6) by the information calculation means 30C (FIG. 1) of the subordinate NC device 30 (step 101 in FIG. 6). Are calculated (steps 102 to 103 in FIG. 6), and then moved to a predetermined processing station (steps 105 and 106 in FIG. 6) by the control (FIG. 1) of the bending control means 30L (steps 105 and 106 in FIG. 6). The worker S abuts and positions the workpiece W against the moved abutments 3 and 4 (step 107 in FIG. 7).
[0020]
The image pickup means 9 is disposed above the bumps 3 and 4 (FIG. 2). The image pickup means 9 is constituted by, for example, a CCD camera, and the CCD camera 9 is in contact with the workpiece W and the bumps 3 and 4. The contact state with is imaged.
[0021]
The CCD camera 9 is mounted so as to be freely positioned above the abutments 3 and 4 in the processing stations A1, A2... An (FIG. 3) in each process.
[0022]
That is, a moving rail 14 extending in the left-right direction is installed between the side plates 7 and 8 of the press brake (FIG. 2), and both ends of the moving rail 14 are provided inside the side plates 7 and 8. It is coupled to the front and rear cylinders SL1, SL2, and is slidably coupled to Y-axis guides 16, 17 laid inside the side plates 7, 8.
[0023]
A rack 15 is provided on the rear surface of the moving rail 14, and the rack 15 meshes with a pinion (not shown) of the X-axis motor Mx attached to the drive slider 13.
[0024]
Further, an upper / lower cylinder 12 is attached to the lower surface of the drive slider 13, and a CCD camera 9 is attached to the upper / lower cylinder 12 via a horizontal turning member 11 and a vertical turning member 10.
[0025]
With this configuration, the abutments 3 and 4 are moved to the predetermined processing stations A1, A2... An (FIG. 3) by the bending control means 30L (FIG. 1) of the subordinate NC device 30 (step 105 in FIG. 6). 106), after the worker S abuts and positions the workpiece W against the abutments 3 and 4 (step 107 in FIG. 6), the imaging control means 30D (FIG. 1) causes the X-axis motor Mx (FIG. 1). 2) If the front and rear cylinders SL1 and SL2 and the upper and lower cylinders 12 are driven and controlled, and the horizontal turning member 11 and the vertical turning member 10 are driven and controlled, the CCD camera 9 can move in the left-right direction (X-axis direction) and the front-rear direction ( Y-axis direction), up-down direction (Z-axis direction), and horizontal angle θ and vertical angle φ direction.
[0026]
Accordingly, the CCD camera 9 can be positioned above the bumps 3 and 4 (FIG. 3) at the processing stations A1, A2... An positions of the respective steps, and the focal point position of the condensing lens by the imaging control means 30D. After the adjustment, the actual image JG in the contact state between the workpiece W and the abutments 3 and 4 can be taken.
[0027]
The real image JG is converted into a one-dimensional electric signal by the CCD camera 9, and then converted into a two-dimensional electric signal by the real image detecting means 30F (FIG. 1) of the subordinate NC device 30. The image is projected on the surface of the upper table 1 by the projection means 18 described later (FIG. 5).
[0028]
On the other hand, projection means 18 and 19 are arranged in front of the upper table 1 (FIG. 4), and each projection means 18 and 19 is constituted by a projector, for example.
[0029]
Among these, the left projector 18 is a projector for actual images, and the actual image JG in a contact state between the workpiece W and the abutments 3 and 4 captured by the CCD camera 9 is projected onto the surface of the upper table 1. To do.
[0030]
The right projector 19 is a projector for a simulation image, and the simulation image SG generated by the simulation image generation means 30G (FIG. 1) of the subordinate NC device 30 is superimposed on the actual image JG based on the product information. The image is projected on the surface of the upper table 1 (FIG. 10).
[0031]
The projectors 18 and 19 are mounted so as to be freely positioned above the worker S in the processing stations A1, A2,.
[0032]
Moreover, since the projectors 18 and 19 (FIG. 4) project the actual image JG and the simulation image SG on the same area on the surface of the upper table 1 as described above, both projectors 18 and 19 are used. Can move in synchronization with the longitudinal direction (X-axis direction) of the upper table 1.
[0033]
That is, when both projectors 18 and 19 are attached to the upper table 1, the former is shown at a predetermined angle so that the real image JG can be projected on the same area of the upper table 1 as the latter, and the simulation image SG can be projected on the same area of the upper table 1. It attaches to the front-end | tip part of such L-shaped members 20 and 21, and connects both L-shaped members 20 and 21 with the connection member 22. FIG.
[0034]
Among these, the base end portion of the left L-shaped member 20 to which the actual image projector 18 is attached is attached to the drive slider 25, and the drive slider 25 is laid on the top portion of the upper table 1 and extends in the longitudinal direction. Slidingly coupled to the rail 23.
[0035]
A rack 24 is provided on the front surface of the rail 23, and the rack 24 meshes with a pinion (not shown) of an X-axis motor Mx ′ attached to the drive slider 25.
[0036]
The base end portion of the right L-shaped member 21 to which the simulation image projector 19 is attached is attached to a driven slider 26, and the driven slider 26 is slidably coupled to the rail 23.
[0037]
With this configuration, when the X-axis motor Mx ′ of the drive slider 25 is driven and controlled by the projection control means 30E of the subordinate NC device 30 (FIG. 1), the driving force of the X-axis motor Mx ′ is the left L-shaped. The slider 20 is transmitted to the driven slider 26 via the member 20, the connecting member 22, and the right L-shaped member 21, and the sliders 25 and 26 move in the longitudinal direction in synchronization with each other. Also move synchronously.
[0038]
Therefore, the projectors 18 and 19 can be positioned above the worker S at the processing stations A1, A2... An position (FIG. 1) in each process, and the projection control means 30E allows the focal position of the condenser lens. By adjusting the above, the projector 18 can project the actual image JG, and the projector 19 can superimpose the actual image JG on the same area of the surface of the upper table 1 (FIG. 10).
[0039]
In this case, in the contact state between the workpiece W and the abutments 3 and 4, the actual image JG by the projector 18 is always projected on the surface of the upper table 1 which is a ram (step 113 in FIG. 6, FIG. 5). .
[0040]
Thus, according to the present invention, even when the gap between the blades is narrow, the contact state between the workpiece W and the abutments 3 and 4 can be confirmed based on the actual image JG, and an inappropriate contact state can be obtained. By correcting (FIG. 8), it is possible to accurately position the workpiece W and improve the accuracy of the flange dimension and the workability.
[0041]
However, whether or not to project the simulation image SG on the actual image JG using the other projector 19 (step 114 in FIG. 7, FIG. 10) is determined by the operator S himself.
[0042]
That is, when the operator S presses the simulation switch 30J (FIG. 1) of the subordinate NC device 30, the CPU 30A that has detected it determines that the simulation image SG is projected on the actual image JG. (YES in step 114 in FIG. 7), the projector 19 is operated via the projection control means 30E.
[0043]
Accordingly, the projector 19 projects the simulation image SG on the surface of the ram 1 so as to be superimposed on the actual image JG (step 121 in FIG. 9).
[0044]
Further, when the simulation image SG is projected on the surface of the ram 1 in such a manner as to be superimposed on the actual image JG (FIG. 10), it is determined whether the two images match automatically or whether the operator S (Step 122 in FIG. 9) is determined by the worker S himself.
[0045]
That is, when the operator S presses the comparison switch 30K together with the simulation switch 30J (FIG. 1) of the subordinate NC device 30, it is assumed that the CPU 30A that has detected it makes an automatic determination (FIG. 9), the comparison means 30H is activated (FIG. 1) to compare the real image JG with the simulation image SG (step 123 in FIG. 9), and as a result, the images do not match. In this case (NO in step 124 in FIG. 9), an alarm is displayed on the screen of the input / output means 30B (FIG. 1) (step 130 in FIG. 9).
[0046]
Thereby, since the coincidence and disagreement between the real image JG and the simulation image SG are automatically determined, the burden on the worker S is reduced, and the improper contact state between the workpiece W and the abutments 3 and 4 is quick. (Step 131 in FIG. 9), the workability is further improved.
[0047]
As the control device for the press brake having the above-described configuration, there are the above-described lower NC device 30 (FIG. 1) and the upper NC device 31.
[0048]
Among these, the host NC device 31 incorporates product information, for example, CAD information. The CAD information includes information such as the thickness of the workpiece W, the material, the length of the bending line, the bending angle of the product, and the flange dimension. These are configured as a three-dimensional view and a development view.
[0049]
CAD information composed of these pieces of information is input to the lower NC device 30 (step 101 in FIG. 6), and then a predetermined operation according to the present invention is performed (steps 102 to 113 in FIG. 6, FIGS. 7 and 9). .
[0050]
The subordinate NC device 30 (FIG. 1) includes a CPU 30A, an input / output unit 30B, an information calculation unit 30C, an imaging control unit 30D, a projection control unit 30E, an actual image detection unit 30F, and a simulation image generation unit 30G. The comparison unit 30H, the simulation switch 30J, and the comparison switch 30K.
[0051]
The CPU 30A performs overall control of the entire apparatus shown in FIG. 1, such as the information calculation means 30C, the imaging control means 30D, and the projection control means 30E, according to the operation procedure of the present invention (corresponding to FIGS. 6, 7, and 9).
[0052]
The input / output means 30B is provided, for example, in the vicinity of the upper table 1 that constitutes a press brake (FIG. 1), and includes a screen such as a keyboard and a liquid crystal.
[0053]
This input / output means 30B has an interface function for the above-described upper NC apparatus 31 (FIG. 1), and by connecting the lower NC apparatus 30 to the upper NC apparatus 31 by wire or wirelessly, the CAD information is obtained. Can be entered.
[0054]
In addition, as described above, the input / output unit 30B automatically determines whether or not the real image JG and the simulation image SG match (YES in step 122 in FIG. 9, steps 123 to 123). 124) When the two images do not match (NO in step 124 in FIG. 9), an alarm is displayed on the screen (step 130 in FIG. 9), and the worker S who sees this displays the projection means. The improper contact state is corrected so that the images JG and SG projected on the surface of the ram 1 by 18 and 19 coincide (FIG. 10) (step 131 in FIG. 9).
[0055]
The information calculation means 30C calculates the bending order, the mold, the mold layout, etc. based on the CAD information input from the host NC apparatus 31 via the input / output means 30B (step 102 in FIG. 6). Thereby, for example, it becomes clear which processing stations A1, A2,... An are positioned for each process, and the CCD camera 9 can move above the abutments 3 and 4 ( Step 108 in FIG.
[0056]
The information calculated by the information calculation means 30C includes the L value and D value for each process necessary for bending (step 103 in FIG. 6).
[0057]
The imaging control unit 30D controls the movement of the CCD camera 9 (FIGS. 2 and 3) described above based on the bending order, the mold, the mold layout, and the like calculated by the information calculation unit 30C. The imaging operation such as the control of the visual field range of the CCD camera 9 is controlled.
[0058]
Similarly, the projection control means 30E performs movement control of the projection means 18 and 19 (FIG. 4) described above based on the bending order, the mold, the mold layout and the like calculated by the information calculation means 30C. The projection operation such as the projection range of the projection means 18 and 19 is controlled.
[0059]
The actual image detecting means 30F (FIG. 1) is, as described above, the actual image in a contact state between the workpiece W made of a one-dimensional electrical signal sent from the CCD camera 9 and the abutments 3 and 4. JG is converted into a two-dimensional electrical signal.
[0060]
The converted real image JG is sent to the projection means 18 and projected on the surface of the ram 1 (FIG. 5).
[0061]
On the surface of the ram 1, as shown in the figure, an actual image 3 of the abutment positioned at a predetermined processing station. _JG 4 _JG And the actual image W of the work _JG The operator S immediately knows whether the contact state is correct or not by looking at these actual images JG.
[0062]
Therefore, when only this real image JG is projected on the surface of the ram 1 (NO in step 114 of FIG. 7), the operator S confirms the real image JG (FIG. 5) (step 115 of FIG. 7), Whether the contact state is correct or not can be determined (step 116 in FIG. 7). If the contact state is negative (NO), correction is performed while viewing the actual image JG (step 120 in FIG. 7).
[0063]
If the correction operation in this case is schematically shown, it is as shown in FIG.
[0064]
That is, in FIG. _JG 4 _JG In contrast, the actual image W of the workpiece _JG Is inclined as shown in the figure, if the work held by the operator is approached, the actual image W of the work _JG Also, the real image 3 _JG 4 _JG I approached and eventually hit completely.
[0065]
As a result, the contact state between the workpiece W and the abutments 3 and 4 is corrected (step 120 in FIG. 7). Therefore, if the operator S confirms the actual image JG on the surface of the ram 1 again (step in FIG. 7). 115), it is found that the contact state is positive (YES in step 116 in FIG. 7), and the work W is accurately positioned.
[0066]
The simulation image generating unit 30G generates a simulation image SG of the contact state between the workpiece W and the abutments 3 and 4 based on the bending order, the mold, and the mold layout calculated by the information calculating unit 30C ( Step 103 in FIG.
[0067]
This simulation image SG (FIG. 1) is sent to the projection means 19, but whether or not it is actually projected on the surface of the ram 1 is determined by the operator S as described above (FIG. 7). Step 114) When the operator S presses the simulation switch 30J (FIG. 1), the projector 19 is operated by the projection control means 30E, and the simulation image SG is projected on the surface of the ram 1 overlaid on the actual image JG. (Step 121 in FIG. 9).
[0068]
Whether the real image JG and the simulation image SG match or not is automatically determined (YES in step 122 in FIG. 9, steps 123 to 124), or even if the operator S himself performs (see FIG. 9). 9 step 122 NO, steps 128 to 129), when the images JG and SG do not match (NO in step 124 in FIG. 9, step 130, or NO in step 129 in FIG. 9). The contact state is corrected by the operator S (step 131 in FIG. 9).
[0069]
A schematic illustration of the correction operation in this case is as shown in FIG.
[0070]
That is, in FIG. _JG 4 _JG And simulation image 3 _SG 4 _SG Are identical and the actual image W of the workpiece _JG Is a simulation image W of the workpiece as indicated by the oblique lines _SG If the worker moves the workpiece held in his hand, the actual image W of the workpiece is assumed. _JG A simulation image W _SG Can be matched.
[0071]
As a result, the contact state between the workpiece W and the abutments 3 and 4 is corrected (step 131 in FIG. 9), so the CPU 30A (FIG. 1) passes through the projectors 18 and 19 and the real image JG and the simulation image. SG is projected again on the surface of the ram 1 (step 121 in FIG. 9).
[0072]
In the case of automatic determination (YES in step 122 in FIG. 9), the comparison means 30H (FIG. 1) compares both images again (step 123 in FIG. 9) and determines that they match (FIG. 9). YES in step 124), for example, OK display is performed on the screen of the input / output means 30B.
[0073]
Also, in the case of the judgment of the worker S itself (NO in step 122 in FIG. 9), the worker S reconfirms visually (step 128 in FIG. 9), and it is understood that the contact state is positive. (YES in step 129 of FIG. 9).
[0074]
Thereby, in any case, the workpiece W is accurately positioned.
[0075]
The bending control means 30L (FIG. 1) moves the abutments 3 and 4 to the processing stations A1, A2... An of each process based on the bending order calculated by the information calculation means 30C (FIG. 6). Steps 105-106).
[0076]
In addition, the bending control means 30L (FIG. 1), after the operator S abuts and positions the workpiece W against the abutments 3 and 4 (step 107 in FIG. 6), the workpiece W and the abutment 3 described above, 4 when the contact state is corrected based on the actual image JG in contact with the image 4 (FIG. 8) or the simulation image SG projected on the actual image JG (FIG. 10). 7 at step 116, or at step 124 in FIG. 9, or at step 129 in FIG. 9), when the operator S steps on the foot pedal 27 (FIG. 1) (step 117 in FIG. 7 or FIG. 9 step 125), and by detecting this, actuating the hydraulic cylinders 5 and 6 and lowering the ram 1 (step 118 in FIG. 7 or step 126 in FIG. 9), bending is performed (step in FIG. 7). 119, or 9 Step 127).
[0077]
Hereinafter, the operation of the present invention having the above-described configuration will be described with reference to FIGS.
[0078]
(1) Operation until the actual image JG in contact with the workpiece W and the abutments 3 and 4 is projected on the surface of the ram 1.
[0079]
In step 101 of FIG. 6, CAD information is input from the host NC device 31, and in step 102, the bending order and the like are calculated. In step 103, the L value for each process, and the workpiece W and the abutment 3, 4 A simulation image SG in a contact state is generated.
[0080]
That is, when CAD information is input from the upper NC device 31 (FIG. 1) to the lower NC device 30 via the input / output means 30B, the information calculation means 30C constituting the lower NC device 30 causes the bending order, L A value and the like are calculated, and data is transmitted from the information calculation means 30C to the simulation image generation means 30G to generate a simulation image SG in a contact state between the workpiece W and the abutments 3 and 4.
[0081]
Then, in step 104 in FIG. 6, machining is started. In step 105, the abutments 3 and 4 are moved to predetermined machining stations A1, A2... An, and when the movement is completed in step 106. (YES), in step 107, the workpiece W is positioned.
[0082]
That is, the CPU 30A that detects that the L value and the D value are calculated and the simulation image SG is generated (step 103 in FIG. 6) (FIG. 1) instructs the bending control means 30L, and the information calculation means 30C. When the abutments 3 and 4 are moved to predetermined processing stations A1, A2... An by controlling the abutments 3 and 4 on the basis of the data calculated by the operator S, the operator S Position the workpiece W against 3 and 4 for positioning.
[0083]
Next, in step 108 in FIG. 6, the CCD camera 9 is moved upward in the bumps 3 and 4. When the movement is completed in step 109 (YES), imaging is started in step 110, and in step 111. When the actual image projector 18 is moved above the worker S at the processing stations A1, A2,... An, and the movement is completed in step 112 (YES), the collision with the work W is performed in step 113. The actual image JG in contact with the 3 and 4 is projected on the surface of the ram 1.
[0084]
That is, after positioning of the workpiece W by the operator S (step 107 in FIG. 6), the CPU 30A (FIG. 1) moves the CCD camera 9 to the predetermined processing stations A1, A2,... After moving the bumps 3 and 4 positioned to An, the CCD camera 9 causes the contact state between the workpiece W and the bumps 3 and 4 to be imaged. Are moved above the worker S in the processing stations A1, A2,.
[0085]
In this state, the actual image JG in contact with the image captured by the CCD camera 9 is transmitted to the actual image projector 18 positioned above the worker S via the actual image detecting means 30F (FIG. 1). , Project on the surface of the ram 1 (FIG. 5).
[0086]
In this case, as described above, when the actual image projector 18 (FIG. 4) moves above the worker S, the simulation image projector 19 also moves above the same worker S in synchronization therewith.
[0087]
(2) Judgment whether or not the simulation image SG is projected on the actual image JG.
[0088]
In step 114 of FIG. 7, it is determined whether or not the simulation image SG is projected on the actual image JG.
[0089]
That is, as described above, whether or not to project the simulation image SG on the actual image JG is determined by the operator S himself when the simulation switch 30J of the lower NC device 30 (FIG. 1) is pressed. The CPU 30A that has detected it determines that duplicate projection is to occur (YES in step 114 in FIG. 7), proceeds to step 121 in FIG. 9, and if the simulation switch 30J is not pressed, there is no duplicate projection. (NO in step 114 in FIG. 7), the process proceeds to step 115 in FIG.
[0090]
(3) Operation when judging whether the contact state is correct or not based only on the actual image JG.
[0091]
As described above, when it is determined in step 114 in FIG. 7 that the simulation image SG is not projected onto the actual image JG (NO), the operator confirms the actual image JG in step 115 and in step 116. Whether the contact state is correct or not is determined.
[0092]
For example, the real image 3 _JG 4 _JG (Fig. 8), the actual image W of the workpiece _JG If the worker S confirms the actual image JG as shown in the drawing, it can be seen that the contact state between the workpiece W and the abutments 3 and 4 is negative (step 116 in FIG. 7). NO).
[0093]
Therefore, if the worker S corrects the contact state in step 120 of FIG. 7 and brings the work held in his hand closer to the abutment, the actual image W of the work is displayed. _JG (Figure 8) _JG 4 _JG I approached and eventually hit completely.
[0094]
As a result, the contact state between the workpiece W and the abutments 3 and 4 is corrected. Therefore, if the operator S confirms the actual image JG on the surface of the ram 1 again (step 115 in FIG. 7), the contact state is changed. It turns out that it is positive (YES in step 116 in FIG. 7), and the workpiece W is accurately positioned.
[0095]
Thereafter, when the operator S steps on the foot pedal 27 (FIG. 1) (step 117 in FIG. 7), the CPU 30A detecting it (FIG. 1) operates the hydraulic cylinders 5 and 6 via the bending control means 30L. By lowering the ram 1 (step 118 in FIG. 7), the workpiece W which is abutted against the abutments 3 and 4 and positioned accurately is bent (step 119 in FIG. 7).
[0096]
(4) Operation when judging whether the contact state is correct or not based on the actual image JG and the simulation image SG.
[0097]
In this case, as described above, the worker S (FIG. 1) presses the simulation switch 30J of the subordinate NC device 30, and the CPU 30A that has detected it determines that duplicate projection is performed ( In step 114 of FIG. 7, YES), the projector 19 is operated via the projection control means 30E.
[0098]
Thereby, the simulation image SG generated in step 103 of FIG. 6 is projected on the surface of the ram 1 by the projector 19 so as to overlap the actual image JG in step 121 of FIG.
[0099]
(4) -A Operation for automatically judging the contact state.
[0100]
In this case, as described above, the worker S (FIG. 1) presses the comparison switch 30K together with the simulation switch 30J of the subordinate NC device 30, and the CPU 30A that detects this presses the CPU 30A in FIG. In step 122, assuming that automatic determination is performed (YES), the comparison unit 30H is activated (FIG. 1), and in step 123 of FIG. 9, the actual image JG and the simulation image SG are compared. Thus, in step 124 in FIG. 9, it is determined whether or not the two images match. If they do not match (NO), the input / output means 30B (FIG. 1) in step 130 in FIG. An alarm is displayed on the screen, and the process proceeds to step 131.
[0101]
(4) -B Operation when worker S himself / herself judges the contact state.
[0102]
In this case, as described above, the worker S (FIG. 1) presses the simulation switch 30J of the lower NC device 30, but does not press the comparison switch 30K. In step 122 of FIG. 9, it is assumed that the operator S himself judges (NO), the process proceeds to steps 128 and 129 of FIG. 9, and the real image JG and (FIG. 10) overlap the simulation image SG. The image content is visually confirmed by the operator S, and whether or not the contact state is correct is determined.
[0103]
Whether the contact state is automatically determined (YES in step 122 in FIG. 9) or the operator S itself determines (NO in step 122 in FIG. 9), the inappropriate contact state is corrected. As described above, the operator S himself performs (step 131 in FIG. 9).
[0104]
For example, the actual image W of the workpiece _JG (FIG. 10), as indicated by the oblique lines, the workpiece simulation image W _SG If the workpiece S is moved by the worker S, the actual image W of the workpiece is moved. _JG A simulation image W _SG Can be matched.
[0105]
As a result, the contact state between the workpiece W and the abutments 3 and 4 is corrected (step 131 in FIG. 9), so that the actual image JG and the simulation image SG are projected again on the surface of the ram 1 (FIG. 9). In step 121), in the case of automatic determination (YES in step 122 in FIG. 9), the comparison means 30H (FIG. 1) determines that both images match (in steps 123 and 124 in FIG. 9). YES), for example, when OK display is performed on the screen of the input / output means 30B and the worker S determines (NO in step 122 in FIG. 9), the worker S visually confirms (in FIG. 9) Step 128), it is found that the contact state is positive (YES in Step 129 of FIG. 9), and in any case, the workpiece W is accurately positioned.
[0106]
Thereafter, similarly, when the operator S depresses the foot pedal 27 (FIG. 1) (step 125 in FIG. 9), the CPU 30A detecting it (FIG. 1), through the bending control means 30L, the hydraulic cylinder 5, 6 is actuated to lower the ram 1 (step 126 in FIG. 9), and bending work is performed on the workpiece W which is abutted against the abutments 3 and 4 and positioned accurately (step 127 in FIG. 9). ).
[0107]
Even in the case of the automatic determination (YES in step 122 in FIG. 9) or in the case where the operator S itself makes a determination (NO in step 122 in FIG. 9), the comparison unit 30H (FIG. 1) of the subordinate NC device 30 performs If a superposition state of the actual image JG and the simulation image SG is created and the superposition state is projected on the surface of the ram 1 by one projector 18 at a predetermined position, only one projector is required, so that the cost can be reduced. It will be reduced.
[0108]
【The invention's effect】
As described above, according to the present invention, in the bending apparatus, even when the gap between the punch and the die is narrow, by checking the contact state between the workpiece and the abutment and accurately positioning the workpiece, the flange dimension This has the effect of improving the accuracy and improving the workability.
[0109]
[Brief description of the drawings]
FIG. 1 is an overall view showing an embodiment of the present invention.
FIG. 2 is a diagram showing an image pickup means 9 constituting the present invention.
FIG. 3 is a diagram showing the relationship between the imaging means 9 constituting the present invention and processing stations A1, A2,... An.
FIG. 4 is a diagram showing projection means 18 and 19 constituting the present invention.
FIG. 5 is a diagram showing a real image JG of the present invention.
FIG. 6 is an operation explanatory diagram until a real image JG of the present invention is projected.
FIG. 7 is an operation explanatory diagram when the contact state between the workpiece W and the abutments 3 and 4 is determined from the real image JG of the present invention.
8 is a diagram illustrating a contact state correction operation in FIG. 7; FIG.
FIG. 9 is an operation explanatory diagram when determining the contact state between the workpiece W and the abutments 3 and 4 based on the real image JG and the simulation image SG of the present invention.
10 is a diagram illustrating a contact state correcting operation in FIG. 9; FIG.
FIG. 11 is an explanatory diagram of a conventional technique.
[Explanation of symbols]
1 Upper table
2 Lower table
3, 4 bumps
5, 6 Hydraulic cylinder
7, 8 Side plate
9 Imaging means
10 Vertical swivel member
11 Horizontal swivel member
12 Vertical cylinder
13, 25 Drive slider
14 Moving rail
15, 24 racks
16, 17 Y-axis guide
18, 19 Projection means
20, 21 L-shaped member
22 Connecting members
23 rails
26 Follower slider
27 Foot pedal
30 NC unit
30A CPU
30B input / output means
30C Information calculation means
30D imaging control means
30E Projection control means
30F real image detection means
30G simulation image generation means
30H comparison means
30J simulation switch
30K comparison switch
31 Host NC unit
32 Intermediate plate
33 Die holder
34 Stretch
SL1, SL2 Front and rear cylinders
D die
P punch
W Work
JG real image
3 _JG 4 _JG Real images of rush 3 and 4
W _JG Real image of work W
SG simulation image
3 _SG 4 _SG Simulation images of rush 3 and 4
W _SG Simulation image of workpiece W

Claims (3)

A punch that abuts the work against the abutment and is attached to the upper table,
In a bending machine that bends a workpiece with a die attached to the lower table,
An imaging means that is attached to the rear of the upper table so as to be freely positioned above the abutment in the processing station of each step, and that images the contact state between the workpiece and the abutment,
The surface of the upper table corresponding to the processing station of each process is attached to the front of the upper table so that it can be positioned above the worker at the processing station of each process and captured by the imaging means. A bending apparatus having projection means for projecting onto an area . There is a simulation image projection means attached to the front of the upper table so that it can be positioned above the worker in the processing station of each step in synchronization with the above-mentioned actual image projection means, and the actual image projection means and the simulation image The bending apparatus according to claim 1 , wherein the projection means projects a simulation image on the surface area of the upper table corresponding to the processing station in each step , with the actual image in a contact state between the workpiece and the abutment. When the simulation image is projected on the surface area of the upper table corresponding to the processing station in each process, it is possible to automatically determine whether or not both images match. 3. The bending apparatus according to claim 2, wherein an alarm display is performed when they do not match.

Images