JP4798770B2 - Bending machine - Google Patents

Description

  The present invention provides a bending apparatus that prevents a machining defect in advance by outputting an alarm to warn an operator when an actual workpiece positioning posture state is different from a predetermined workpiece positioning posture state. About.

Examples of conventional bending apparatuses include those disclosed in Japanese Patent Application Laid-Open No. 2004-160547 and Japanese Patent Application Laid-Open No. 5-165525.

Among these, the bending apparatus disclosed in Japanese Patent Application Laid-Open No. 2004-160547 has a navigation member that can move in the left-right direction, and the operator can position the workpiece at a predetermined position in the processing station. It is designed to guide workers.

Further, the bending apparatus disclosed in Japanese Patent Application Laid-Open No. 5-165525 has a large display provided on the upper table, and the operation switch, the shape of the work, etc. are displayed on the large display, thereby viewing the display. This makes it easy for workers to work.
JP 2004-160547 A Japanese Patent Laid-Open No. 5-165525

  However, neither of the two prior arts confirms whether the actual posture state at the time of workpiece positioning is correct or incorrect.

  As a result, the operator may bend in the wrong workpiece positioning posture, resulting in processing failure, the desired product cannot be processed, and it is necessary to start processing again. Bad effects occur.

  It is an object of the present invention to provide a bending that prevents machining defects in advance by outputting an alarm to warn an operator when an actual workpiece positioning posture state is different from a predetermined workpiece positioning posture state. Provide processing equipment.

In order to solve the above problems, the present invention as described in claim 1,
It has a projector 2 and a light receiver 3 of a CCD camera functioning as a safety device, and a workpiece W is bent by molds P and D comprising a punch P mounted on the upper table 4 and a die D mounted on the lower table 5. In the bending machine to process,
Bending order / die determination means 20C for determining the bending order and mold based on product information;
Work positioning posture state diagram creating means 20D for creating a workpiece positioning posture state diagram α for each bending order based on the determined bending order and mold,
Image detection processing means 20E for detecting and processing the posture state at the time of actual workpiece positioning as an image;
Comparison means 20F for comparing the detected workpiece positioning posture state and the created workpiece positioning posture state diagram α,
As a result of the comparison, if the two do not match, a technical means called a bending apparatus characterized by comprising an alarm generating means 20G for generating an alarm AL is taken.

According to the above configuration of the present invention, for example, the image detection processing means 20E (FIG. 1) is configured by the projector 2 and the light receiver 3 of the CCD camera that functions as a conventional safety device, so that after workpiece positioning (FIG. 7). In step 104), the actual workpiece positioning posture state is imaged (step 105 in FIG. 7), and if it does not match the previously created process diagram α (FIG. 3) (NO in step 106 in FIG. 7), an alarm is generated. AL can be generated (step 115 in FIG. 7).

  Therefore, according to the present invention, when the actual workpiece positioning posture state is different from the predetermined workpiece positioning posture state, an alarm is output to warn the operator to prevent machining defects in advance. There is an effect of providing a bending apparatus.

  Further, according to the present invention, for example, when a foreign matter other than the workpiece W and the molds P and D enters the machining area before the ram 4 reaches the mute point MP (FIG. 5), the foreign matter is detected. Thus, the ram 4 can be emergency stopped (YES in step 109 in FIG. 7 ⇒ step 116), so that the safety of the worker S is ensured. Further, for example, the ram 4 is connected to the pinching point PP (FIG. 6). ) After reaching the predetermined ram stroke (YES in step 112 in FIG. 7), after the machining is finished and the ram 4 is stopped (step 113 in FIG. 7), the bending angle θ (FIG. 6) is detected. 7 (step 114 in FIG. 7), it can be confirmed that a desired bending angle has been obtained, and the projector 2 and the receiver 3 of the CCD camera functioning as a safety device that has been conventionally installed. Thus, if the image detection processing means 20E is configured, It is possible to use the device, the configuration of the present invention is simplified, there is also an effect that it is possible to suppress the turn cost rise.

The present invention will now be described by way of example with reference to the accompanying drawings.
FIG. 1 is an overall configuration diagram of the present invention, and a bending apparatus 1 illustrated is, for example, a descending press brake.

  This press brake has side plates 8 and 9 on both sides of the machine body, and on the upper side of the side plates 8 and 9, for example, hydraulic cylinders 6 and 7 which are ram driving sources are provided. The upper table 4 moves up and down, and a punch P is attached to the upper table 4.

  A lower table 5 is disposed below the side plates 8 and 9, and a die D is mounted on the lower table 5.

With this configuration, the operator S abuts and positions the work W against the abutments 10 and 11 of the back gauge device disposed behind the lower table 5, and then turns the foot pedal 12 to turn on the hydraulic cylinder 6. , 7 and the upper table 4 as a ram is lowered, the work W is bent by the cooperation of the punch P and the die D.

As shown in the figure, the upper table 4 is provided with a projector 2 and a light receiver 3 of a CCD camera that function as a safety device conventionally. For example, a projector 2 and a light receiver 3 of the CCD camera are used to connect an NC device 20 to be described later. An image detection processing means 20E is configured.

  As shown in FIG. 2, the height positions of the projector 2 and the light receiver 3 of the CCD camera are at positions corresponding to the lower end of the punch P, and a predetermined area A including the lower end of the punch P is an imaging range.

  With this configuration, the image detection processing means 20E (FIG. 1), after positioning the workpiece (step 104 in FIG. 7), captures the actual workpiece positioning posture state (step 105 in FIG. 7), and the process diagram created in advance If it does not coincide with α (FIG. 3) (NO in step 106 in FIG. 7), an alarm AL can be generated via the alarm generation means 20G (FIG. 1) (step 115 in FIG. 7).

  Therefore, as described above, according to the present invention, when the actual workpiece positioning posture state is different from the predetermined workpiece positioning posture state, an alarm is output to warn the operator to that effect, It is possible to provide a bending apparatus that prevents processing defects in advance.

In addition, the image detection processing means 20E (FIG. 1) has the captured actual workpiece positioning posture (the left diagram in FIG. 4) coincides with the corresponding process diagram (FIG. 3) (YES in step 106 in FIG. 7). When the operator S turns on the foot pedal 12 (FIG. 1), the ram 4 descends (step 107 → step 108 in FIG. 7), and the ram 4 (FIG. 5) mute points MP (almost from the upper surface of the work W). If a foreign object such as the finger of the operator S other than the workpiece W, the mold P, or D enters the machining area before reaching the 10 mm), it can be detected by imaging it (step in FIG. 7). 109 YES).

  Thus, by making the ram 4 stop emergency (step 116 in FIG. 7), according to the present invention, the safety of the worker is ensured.

Further, the image detection processing means 20E (FIG. 1) does not detect the foreign matter (NO in step 109 of FIG. 7), and the safety device after the mute point MP becomes invalid (YES in step 110 of FIG. 7 → step 111). ) After the ram 4 reaches the pinching point PP (FIG. 6), the bending angle θ can be detected by imaging the state of jumping as the work W is bent (YES in step 112 in FIG. 7). ⇒ Step 113 ⇒ Step 114).

Thereby, according to this invention, it can confirm that the desired bending angle was obtained.

Furthermore, as described above, the image detection processing means 20E (FIG. 1) is constituted by the projector 2 and the light receiver 3 of the CCD camera that functions as a conventional safety device, so that the existing device is used. Therefore, the configuration of the present invention is simplified, and as a result, cost increases can be suppressed.

  The projector 2 and the light receiver 3 of the CCD camera functioning as the safety device are fixed to the upper table 4, but may be attached to the upper table 4 so as to be movable up and down.

On the other hand, the press brake control device of FIG. 1 is, for example, an NC device 20 provided on the side plate 8. The NC device 20 includes a CPU 20A, an input / output means 20B, and a bending order / die determining means 20C. , Workpiece positioning posture state diagram creation means 20D, image detection processing means 20E, comparison means 20F, and alarm generation means 20G.

  The CPU 20A performs overall control of the entire apparatus shown in FIG. 1, such as the bending order / die determining means 20C and the workpiece positioning posture state diagram creating means 20D, in accordance with an operation procedure for implementing the present invention (for example, corresponding to FIG. 7).

The input / output means 20B is composed of, for example, an operation box movably provided on the upper table 4, and has input means such as various keys and output means such as a screen.

For example, the operator S manually inputs product information, and the product information is, for example, CAD information. The input / output means 20B includes, for example, CAD information on the workpiece W, the material, the bending angle, the flange dimension, the bending line, and the like. In addition, it has a development view and a three-dimensional view of the workpiece W.

  Based on the product information, the bending order / mold determining means 20C determines the bending order (process) and the molds P and D (molds P and D) to be mounted on the upper table 4 and the lower table 5 for each bending order. And other information necessary for processing such as D value and L value.

The workpiece positioning posture state diagram creating means 20D generates a workpiece positioning posture state diagram α (FIG. 3) for each process based on the bending order and molds P and D determined by the bending order / die determining means 20C. create.

This workpiece positioning posture state diagram α is referred to as a process diagram, and shows a posture state for each process when the workpiece W is positioned by abutting against the abutments 10 and 11.

    In this case, as shown by the arrow in FIG. 3, based on the posture state (broken line) of the workpiece W that has bounced up after the processing in the previous step, the workpiece positioning posture state (solid line) before the processing in the corresponding step is created Is done.

The image detection processing means 20E (FIG. 1) detects and processes the posture state during actual workpiece positioning as an image.

  That is, as described above, the image detection processing means 20E is composed of the projector 2 and the light receiver 3 of the CCD camera that functions as a conventional safety device. After the workpiece is positioned (step 104 in FIG. 7), the actual detection processing means 20E By imaging the posture state at the time of workpiece positioning (left diagram in FIG. 4), it is detected as an image, and then subjected to predetermined processing such as noise removal, and is compared with the process diagram (step 106 in FIG. 7). .

  The comparison means 20F (FIG. 1) compares the actual workpiece positioning posture state that has been detected and the corresponding process diagram, and the alarm generation means 20G determines that if the result of the comparison is that the two do not match, the character or voice An alarm AL composed of light, etc. is generated.

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

(1) Operation until the actual workpiece positioning posture is imaged.
In step 101 of FIG. 7, product information is input, in step 102, the bending order and the mold are determined, in step 103, a process diagram is created, in step 104, the workpiece W is positioned, in step 105, The actual workpiece positioning posture state is imaged.

  That is, the CPU 20A that has detected that product information has been input via the input / output means 20B (FIG. 1) described above activates the bending order / die determination means 20C, and turns the bending order, molds P, D Then, the work positioning posture state diagram creating means 20D is activated to create a process diagram α (FIG. 3).

  Then, this process chart α (FIG. 3) is stored in, for example, a memory (not shown), and is compared with an actual workpiece positioning posture state (step 105 in FIG. 7) captured later (step 106 in FIG. 7). .

  The determined bending order, molds P, D, etc. are displayed on the screen of the operation box 20B, which is the input / output means 20B (FIG. 1), for example. With the molds P and D being mounted at predetermined positions on the upper and lower tables 4 and 5, the workpiece W is inserted into the processing area and positioned against the abutments 10 and 11 positioned at the predetermined positions. .

In this state, the CPU 20A activates the image detection processing means 20E to image the workpiece W on the positioned die D (the left diagram in FIG. 4), whereby the posture state at the time of actual workpiece positioning is the image. Is detected.

(2) Comparison operation with process diagram.
In step 106 of FIG. 7, it is determined whether or not it matches the process diagram.

  That is, in step 105 of FIG. 7, the CPU 20A that senses that the posture state at the time of actual workpiece positioning has been imaged and detected as an image (FIG. 1), then activates the comparison means 20F, and The actual workpiece positioning posture imaged (left diagram in FIG. 4) is compared with the process diagram (right diagram in FIG. 4).

(2) -A Operation when it does not match the process diagram.
If it is determined in step 106 in FIG. 7 that the actual workpiece positioning posture does not match the process diagram, an alarm AL is generated in step 115.

That is, in FIG. 4, the actual workpiece positioning posture imaged (left diagram in FIG. 4) has flanges F1 and F2, but the process diagram (right diagram in FIG. 4) has flanges F1 and F2. It is a flat part H on the rear side (the abutment 10 and 11 side) and does not have the flanges F1 and F2. For example, the operator mistakes the bending order, and what is the original workpiece end face T1 (right figure in FIG. 4) This is a case where a different workpiece end face T2 is positioned against the abutments 10 and 11,

  In this case, the comparison means 20F sets a comparison area A ′ having the same size as the imaging range A (left figure of FIG. 4) of the image detection processing means 20E described above, as shown in the right figure of FIG. The actual work positioning posture state imaged in the imaging area A ′ is captured in the comparison area A ′ (the left figure in FIG. 4) and compared with the corresponding process diagram.

  For example, as shown in FIG. 4, if the actual workpiece positioning posture imaged in a certain process has flanges F1 and F2 (the left figure of FIG. 4), the comparison means 20F (FIG. 1) The workpiece positioning posture state having F1 and F2 is taken into the comparison area A ′ and compared with the flat portion H (the right diagram in FIG. 4) which is the corresponding workpiece positioning posture state.

  And since the two are clearly different, the comparison means 20F (Fig. 1) can be bent as it is, and the bending line m2 (left diagram in Fig. 4) is different from the original bending line m1 (right diagram in Fig. 4). ) Is bent, and the desired product cannot be obtained. Therefore, the alarm AL is generated by informing the alarm generation means 20G (FIG. 1) of the fact.

  Thus, according to the present invention, as described above, when the actual workpiece positioning posture state is different from the predetermined workpiece positioning posture state, an alarm is output to warn the operator to that effect. Thus, it becomes possible to prevent in advance processing defects such as failure to obtain a desired product.

(2) -B Operation when it matches the process diagram.
On the other hand, if it is determined in step 106 in FIG. 7 that the actual workpiece positioning posture state matches the process diagram, in step 107, the foot pedal 12 is turned on, and in step 108, the ram 4 Is lowered.

  In other words, if it is determined that the actual workpiece positioning posture (left figure in Fig. 4) matches the process diagram, for example, "Work positioning is normal" on the screen of the operation box 20B (Fig. 1). Is displayed, the worker S who sees it depresses the foot pedal 12 and turns it on.

  As a result, the hydraulic cylinders 6 and 7 are operated, the ram 4 starts to descend, and before the ram 4 reaches the mute point MP (FIG. 5), foreign matter other than the workpiece W and the molds P and D is processed. When the vehicle enters the vehicle, the foreign object can be detected and the ram 4 can be emergency stopped (YES in step 109 in FIG. 7 → step 116).

  That is, in this case, since the bending apparatus 1 is a lowering press brake (FIG. 1), the punch P also descends as the upper table 4 (FIG. 5) descends, and the punch P contacts the workpiece W. Before reaching a predetermined position (for example, the mute point MP) with respect to the workpiece W before the workpiece W, the image detection processing means 20E enters the machining area, and foreign matter other than the workpiece W, the molds P, D, for example, the worker S Take an image of the hand.

  As a result, the image detection processing means 20E can detect the foreign matter, and the CPU 20A that detects it (FIG. 1) controls the hydraulic cylinders 6 and 7 to stop the ram 4 in an emergency stop.

Thereby, according to this invention, as already stated, the safety | security of the operator S is ensured.

  Further, after the image detection processing means 20E detects no foreign matter (NO in step 109 of FIG. 7) and the ram 4 has passed the mute point MP (YES in step 110 of FIG. 7), the safety device is disabled ( Step 111 in FIG. 7) When the ram 4 continues to descend and the ram 4 reaches a predetermined ram stroke (YES in step 112 in FIG. 7), the ram 4 stops (step 113 in FIG. 7), The bending angle θ is detected (step 114 in FIG. 7).

That is, after the mute point MP (FIG. 5), as is well known, the safety device is disabled, and even if the workpiece W (FIG. 6) enters the imaging range A, the ram 4 does not stop, Continued.

Accordingly, the image detection processing means 20E (FIG. 1), after the ram 4 reaches the pinching point PP (FIG. 6), in other words, after the punch P contacts the workpiece W, the bending process of the workpiece W proceeds. By capturing an image of the jumping state associated with, the bending angle θ of the workpiece W when the ram 4 reaches a predetermined ram stroke and stops can be detected.

Thereby, according to this invention, as already stated, it can confirm that the desired bending angle was obtained.

  As described above, according to the present invention, when the actual workpiece positioning posture state is different from the predetermined workpiece positioning posture state, an operator outputs an alarm. This is used for a bending machine that prevents machining defects in advance, and also when the ram detects foreign matter before reaching the mute point and detects the bending angle of the workpiece after the pinching point. Further, it is applicable to not only a descending press brake but also an ascending press brake and is extremely useful.

1 is an overall configuration diagram of the present invention. It is a figure which shows the imaging range A of the image detection process means 20E of this invention. It is a figure which shows process drawing (alpha) by this invention. It is comparison explanatory drawing of the actual workpiece positioning attitude | position state imaged by this invention, and process drawing. It is explanatory drawing of the foreign material detection by this invention. It is explanatory drawing of bending angle (theta) detection by this invention. It is a flowchart for demonstrating operation | movement of this invention.

Explanation of symbols

1 Bending machine
2 Floodlight
3 Receiver
4 Upper table
5 Lower table
6, 7 Hydraulic cylinder
8, 9 side plate
10, 11 bumps
12 Foot pedal
20 NC unit
20A CPU
20B I / O means
20C Bending order / die determination method
20D Work positioning posture state diagram creation means
20E Image detection processing means
20F comparison means
20G Alarm generation means A Imaging range A 'of image detection processing means 20E Comparison area D of comparison means 20F Die MP Mute point PP Pinching point P Punch W Work α Process diagram

Claims (3)

In a bending apparatus having a projector and a light receiver of a CCD camera that functions as a safety device, and bending a workpiece by a die composed of a punch mounted on an upper table and a die mounted on a lower table,
Bending order / die determination means for determining the bending order and mold based on product information;
A workpiece positioning posture state diagram creating means for creating a workpiece positioning posture state diagram for each bending order based on the determined bending order and mold;
Image detection processing means for detecting and processing the posture state at the time of actual workpiece positioning as an image;
Comparison means for comparing the detected workpiece positioning posture state with the created workpiece positioning posture state diagram;
A bending apparatus characterized by comprising an alarm generating means for generating an alarm when both do not match as a result of comparison. 2. The bending apparatus according to claim 1, wherein the image detection processing unit detects foreign matter other than the workpiece and the mold that have entered the machining area before reaching a predetermined position with respect to the workpiece before the punch contacts the workpiece. 2. The bending apparatus according to claim 1, wherein the image detection processing unit detects a bending angle of the workpiece after the punch contacts the workpiece.

Images