JP4889679B2 - Bending machine - Google Patents

Description

  The present invention relates to a bending machine.

  Conventionally, for example, an optical safety device is installed in a bending machine such as a press brake for safety of an operator, and a mold damage pressure monitor is installed for protection of the machine.

  Of these, the optical safety device is configured to project a light beam such as a laser beam on the processing area of the bending machine, and to stop the ram when an operator blocks the light beam. The safety of workers is ensured.

  In addition, the mold break pressure monitor monitors the oil pressure set based on the mold information input in advance, and when the set pressure based on the wrong mold is exceeded, bending work and bending are performed using the mold. When work accompanying the work (mold matching, mold origin setting) is performed, the bending machine is stopped to prevent damage to the mold and protect the machine.

(1) Issues regarding optical safety devices.

  In the conventional optical safety device, the light beam is in the processing area and close to the operator's hand, so if the light beam is blocked by the operator's hand, even if the ram is stopped, In order to improve workability, when the light beam position is closer to the bending line than the specified range, the punch may hit the hand due to the inertia of the ram, and danger may not be avoided. Further, when the light beam is arranged at the specified position, a small work cannot be held by hand, which causes a problem in workability.

  Further, when a workpiece having a high flange size is to be machined, the flange may block the light beam, so that machining may not be possible.

  In other words, the conventional optical safety device cannot distinguish whether it is a part of the body such as the worker's hand or the workpiece. However, machining is limited depending on the shape of the workpiece.

(2) Problems with mold break pressure monitoring.

  In the conventional mold break pressure monitor, the mold information may be input incorrectly. In this case, even if the operator uses a different mold, the mold break pressure monitor makes an accurate judgment. In some cases, the mold is damaged as it is processed.

  In addition, the conventional mold breakage pressure monitor cannot detect even when an operator is working at a different mold station position. It may be damaged. Further, in this case, the predetermined product is not processed, and the processing must be performed again from the beginning, and the processing efficiency is extremely low.

  As described above, the conventional mold breakage pressure monitor cannot make a correct / incorrect judgment even if the operator uses an incorrect mold if there is an error in inputting the mold information. However, even if working at the wrong mold station position, it cannot be detected, and therefore, damage to the mold cannot be reliably prevented and the original function cannot be exhibited.

  An object of the present invention is to ensure that an operator uses a regular mold regardless of the presence / absence of mold information to reliably prevent the mold from being damaged and improve the processing efficiency.

The present invention is a bending machine provided with a die composed of a punch (P) and a die (D) for bending a workpiece (W), the input means (30G) for inputting workpiece information, and the input means. Bending order / die / die layout determining means (30B) for determining bending order, mold, mold layout based on workpiece information from (30G), and measuring the length of the mold attached to the bending machine In order to do so, a CCD camera (6) for imaging with the entire mold in view, and a mold for measuring the mold length (L) based on the imaging signal (S1) transmitted from the CCD camera (6) The length of the mold determined by the length measuring means (30C) and the bending order / mold / mold layout determining means (30B) and the mold length measured by the mold length measuring means (30C) Comparison means (30D) for comparing length and the ratio As a result of comparison by means (30D), when the lengths of both molds are different, alarm means (30E) that issues an alarm or a ram stop signal, and as a result of comparison by said comparison means (30D), the lengths of both molds Are equal to each other, the pressure calculating means (30F) for calculating the upper limit pressure for the second machining based on the actually measured pressure during the first bending, and the pressure calculating means for calculating the upper limit pressure for the second machining. And a main body NC device (22) that controls the upper limit pressure calculated by (30F) .

  As described above, according to the present invention, an operator can safely perform bending.

  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 first invention.

  In FIG. 1, reference numeral 1 is a bending machine, 2 is a main body NC device, and 3 is a first monitoring device 3.

  As the bending machine 1 in this case, for example, there is a descending press brake, and the press brake 1 has an upper table 20 that moves up and down by a hydraulic cylinder 5 and a lower table 21 directly below the upper table 20. The punch P and the die D are mounted on the lower table 21, respectively.

  The hydraulic cylinder 5 communicates with a pressure control valve 8 as shown in the figure, and the pressure control valve 8 communicates with a hydraulic pump 9 and an oil tank 10.

  With this configuration, when the hydraulic cylinder 5 is driven via the pressure control valve 8 and the speed control valve 7 by the control of the main body NC device 2 and the upper table 20 as a ram is lowered, the cooperation between the punch P and the die D is achieved. A predetermined bending process is performed on the workpiece W by the action.

  In this case, for example, the hydraulic cylinder 5 is provided with an imaging means 6 that constitutes an image recognition device, for example, a CCD camera 6, and cooperates with a body motion detection means 3C of the first monitoring device 3 (FIG. 2) described later. An operation state of a predetermined part of the body of the worker T, for example, a finger F (FIG. 3) of the hand is detected.

  In addition, a linear encoder 4 is attached to, for example, the ram 20 of the press brake, and cooperates with the ram operation detecting means 3B of the first monitoring device 3 (FIG. 2) to be described later. )) The operation status is detected.

  The main body NC device 2 of the bending machine 1 having the above configuration performs a predetermined bending process on the workpiece W by the punch P and the die D by controlling the ram 20.

  Further, the main body NC device 2 outputs workpiece information, mold information and the like as a signal S3 to the first monitoring device 3.

  Accordingly, the first monitoring device 3 predicts interference between the ram 20 and the body of the worker T based on the information and the signals S1 and S2 from the CCD camera 6 and the linear encoder 4, and the ram control signal S4. Is output, the main body NC device 2 inputs the input to, for example, rapidly stop or decelerate the ram 20.

  At this time, the main body NC device 2 monitors the operation of the first monitoring device 3 by inputting the signals S1 and S2 from the CCD camera 6 and the linear encoder 4 in the same manner as the first monitoring device 3.

  Furthermore, the main body NC device 2 drives the CCD camera 6 to thereby determine an area set in advance to detect where the position of the finger F of the hand of the worker T is, as will be described later (FIG. 6). In the field of view.

  The first monitoring device 3 (FIG. 1) constantly monitors the operation status of the ram 20 and the operation status of the finger F of the hand of the worker T, and generates a predetermined ram control signal S4 based on the positional relationship between the two. Send it out.

  The first monitoring device 3 (FIG. 2) includes a CPU 3A, a ram motion detection unit 3B, a body motion detection unit 3C, a ram / body interference prediction unit 3D, an input unit 3E, an output unit 3F, and a storage unit. It is composed of 3G.

  The CPU 3A performs overall control of the entire apparatus of FIG. 2, such as the ram motion detection means 3B and the body motion detection means 3C, in accordance with the operation procedure of the first invention (FIG. 8).

  Based on the ram 20 position detection signal S2 from the linear encoder 4, the ram movement detection means 3B detects the operation state of the ram 20, more specifically, the position and speed of the ram 20, and the detected position and speed are It is sent to the ram / body interference prediction means 3D described later.

  The body motion detecting means 3C detects a predetermined part of the body of the worker T, for example, the motion state of the finger F of the hand as described above, more specifically, the position and speed of the finger F of the hand, The position and velocity are similarly sent to the ram / body interference prediction means 3D.

  The ram / body interference prediction means 3D determines whether or not they interfere with each other based on the position and speed of the finger F of the hand of the worker T and the ram 20 input from the ram movement detection means 3B and the body movement detection means 3C. Judging.

  In this case, the ram / body interference prediction means 3D expands the data such as the position of the finger F of the ram 20 and the hand of the worker T into, for example, two-dimensional coordinates as shown in FIG. To do.

  In FIG. 3, on the right t (time) Z (distance) coordinate, an operation situation based on the position and speed of the ram 20 is shown, and according to this operation situation, on the center Y (distance) Z (distance) coordinate Shows a state in which the ram 20 descends toward the workpiece W placed on the die D.

  In this case, a danger point a and a machine stop point b are set at the safety distance c, respectively, and it is determined whether or not the ram 20 and the finger F of the hand of the operator T interfere with each other. The control signal S4 is used as a reference for transmission.

  For example, in the case of FIG. 3, when an expected arrival position (3) ′, which will be described later, comes below the expected arrival position (3) (= Z2) of the finger F of the danger point a of the ram 20. Then, it is determined that the ram 20 and the finger F of the hand interfere with each other, and a ram control signal S4 is sent to stop the ram 20 at the position of the machine stop point b (= Z1).

  Further, in FIG. 3, on the t (time) Z (distance) coordinate on the left side, an operation state based on the position and speed of the finger F of the hand recognized by the CCD camera 6 is shown.

For example, in the case of FIG. 3, the finger F moves in the direction of the arrow at a predetermined speed V _F so that the image reading position of the finger F moves from (1) to (2). If it moves as it is, the predicted arrival position becomes (3) (Z2). As described above, the danger point a at the predicted arrival position (3) ′ of the ram 20 is higher than the predicted arrival position (3). Since they came down, they were judged to interfere.

  Such a criterion is the same for FIGS. 4 and 5 described later.

  Further, as shown in FIG. 6, the body motion detecting means 3 </ b> C has a position in the front and rear direction that is set in advance in the mold nearest I, the mold far away II, and the area in the up and down direction. Detection is based on a certain range III between the blades and the upper and lower IV of the mold.

  When the body motion detection means 3C detects the position / velocity of the finger F of the hand of the worker T belonging to the area set in this way, the ram / body interference prediction means 3D The operation status of the finger F is detected (for example, FIG. 3), and whether or not they interfere with each other is determined based on the relationship with the operation status of the ram 20 based on the position / velocity of the ram 20 detected by the ram operation detection means 3B. Determine and send a predetermined ram control signal S4.

  In this case, the pattern of what kind of ram control signal S4 is transmitted from the degree of interference between the ram 20 and the finger F of the ram / body interference predicting means 3D depends on the operation status of the finger F of the hand ( FIG. 7) At that time, it is divided into several parts depending on the relative relationship between the worker information consisting of the position of the finger F of the hand and the ram control signal S4 corresponding to the operation state of the ram 20.

  This relative relationship is stored, for example, as a database in storage means 3G described later (FIG. 2).

  Thereby, the ram / body interference prediction means 3D determines whether or not the ram 20 and the finger F of the hand interfere with each other, and then sends a predetermined ram control signal S4.

  On the other hand, the input means 3E (FIG. 2) is composed of a keyboard, a mouse, etc., and inputs work information such as plate thickness and mold information such as punch P / die D dimensions and the operator described in FIG. Information and data comprising the ram control signal S4 are input, and these are stored in the storage means 3G as a database.

  The output means 3F is composed of a liquid crystal or the like, and can be confirmed by displaying the information data input by the input means 3E.

  The operation of the bending apparatus having the above-described configuration is shown in FIG. 8, for example. When the machining is started in step 101, the position and speed of the ram 20 are detected in step 102. In step 103, the operator T The position and speed of the finger F of the user's hand are detected. In step 104, it is detected whether or not the ram 20 and the finger F of the hand of the worker T interfere with each other.

  If both interfere with each other (YES in step 104 in FIG. 8), in step 107, a ram control signal S4 such as a sudden stop of the ram 20 is transmitted, and the process returns to step 101. No. 8 of step 104), in step 105, a ram control signal S4 for rapidly lowering the ram 20 and then lowering the ram 20 is sent out. In step 106, machining is continued.

  Hereinafter, as a representative example in FIG. 8, the operations for the patterns A, B, and C (FIG. 7) will be described in detail with reference to FIGS. 3, 4, and 5.

(1)-(1) Pattern A operation (FIG. 3).

  The pattern A is shown in FIG. 3, and the finger F of the hand is in the immediate vicinity I of the mold (FIG. 6) and close to the mold (FIG. 7). Therefore, a ram control signal S4 for suddenly stopping the ram 20 is transmitted.

  That is, when the finger F of the hand is moving and it is determined that the ram 20 and the finger F of the hand interfere with each other as it is, the ram 20 is suddenly stopped regardless of whether it is high speed or low speed.

In FIG. 3, the ram / body interference prediction means 3D (FIG. 2) reads the image transmitted by the body motion detection means 3C (FIG. 2), and as a result, the finger F of the hand moves from the position (1) to the position ( Go to 2), from the direction of the velocity V _F at that time to detect the arrival expected position (3).

Further, the ram body interference prediction unit 3D (Fig. 2), the position of the ram movement detecting means 3B ram 20 which is transmitted by, the speed, the ram 20 is positioned at a high speed V _PH (1) position from the '(2 ) ′ And when it reaches the position (2) ′, the expected arrival position (3) ′ of the ram 20 is detected on the assumption that it has subsequently moved at the same high speed V _PH .

  In this case, when the predicted arrival position (3) of the finger F of the hand and the predicted arrival position (3) ′ of the ram 20 are compared, the ram 20 is more than Z2 which is the predicted arrival position (3) of the finger F of the hand. The risk point a is clearly below.

  Thereby, the ram / body interference prediction means 3D (FIG. 2) determines that the ram 20 and the finger F of the ram 20 interfere with each other when the ram 20 is at the position (2) ′. At Z1 which is the machine stop point b in (2) ′, for example, a ram control signal S4 for suddenly stopping the ram 20 descending at high speed is sent to the main body NC device 2.

  Receiving this ram control signal S4, the main body NC device 2 (FIG. 2) controls the pressure control valve 8 and the speed control valve 7 to suddenly stop the ram 20.

(1)-(2) Pattern B operation (FIG. 4).

Pattern B is shown in FIG. 4 and the finger F of the hand is in the immediate vicinity I of the mold and (FIG. 6) between the blades IV and is stationary (FIG. 7), and the relationship with the operation status of the ram 20 described later. from a case of sending the ram control signal S4 for switching to the low speed V _PL from the high-speed V _PH the ram 20 at a speed switching position Z3.

  That is, the finger F of the hand is stationary, but is not on the lower extension line E of the punch P, does not reach the edge of the blade, is stationary in front of the mold, and the ram 20 and the finger F of the hand This is a case where it is determined that there is no interference and processing is continued.

In FIG. 4, the ram / body interference prediction means 3D (FIG. 2) reads the image transmitted by the body motion detection means 3C (FIG. 2), and as a result, the finger F of the hand moves to the position (1) and the position ( Since it overlaps with 2) and the speed V _{F at} that time is zero, it is determined that the finger F of the hand is stationary.

Also, the ram / body interference predicting means 3D (FIG. 2), from the position / velocity of the ram 20 transmitted by the ram motion detecting means 3B, the ram 20 is similar to the pattern A (FIG. 3), Assuming that the vehicle has moved at the high speed V _PH from the position (1) ′ to the position (2) ′ and has reached the position (2) ′, it has moved at the same high speed V _PH thereafter. (3) 'is detected.

  However, in the case of this pattern B, as described above, the finger F of the hand is stationary in front of the mold.

Therefore, the ram / body interference predicting means 3D (FIG. 2) determines that the ram 20 and the finger F of the ram 20 do not interfere with each other when the ram 20 is in the position (2) ′. 2) ′, a ram control signal S4 for switching the ram 20 from the high speed V _PH to the low speed V _PL at a predetermined speed switching position Z3 is sent to the main body NC device 2.

  In this case, the speed switching position Z3 can be set to a position of, for example, 20 mm at which the ram 20 can be stopped without being pinched even if the finger F of the hand is inserted between the blades.

Body NC apparatus 2 that receives the ram control signal S4 by controlling (Fig. 2), as well as the pressure control valve 8 and the speed control valve 7, the workpiece W by switching the ram 20 from the high-speed V _PH to the low speed V _PL Continue processing.

(1)-(3) Pattern C operation (FIG. 5).

The pattern C is shown in FIG. 5, and the finger F of the hand is in the die cutting edge III and (FIG. 6) the cutting edge range IV (FIG. 7). 'switched from the high-speed V _PH to the low speed V _PL, safety distance estimated position at the time of low-speed V _PL (4)' interference determination position the ram 20 from the relationship (2) sends a ram control signal S4 to a sudden stop in Is the case.

  That is, the finger F of the hand is stationary similarly to the pattern B (FIG. 4). However, unlike the pattern B, the finger F of the hand is on the lower extension line E of the punch P and reaches between the blades. In this case, it is determined that the ram 20 and the finger F of the hand interfere with each other based on the relationship with the ram 20, and a sudden stop is made at a predetermined position.

In FIG. 5, the ram / body interference prediction means 3D (FIG. 2) reads the image transmitted by the body motion detection means 3C (FIG. 2), and as a result, the finger F of the hand moves to position (1) and position ( Since it overlaps with 2) and the speed V _{F at} that time is zero, it is determined that the finger F of the hand is stationary.

Also, the ram / body interference prediction means 3D (FIG. 2) determines the position of the ram 20 from the position (1) ′ at the high speed V _PH from the position / speed of the ram 20 transmitted by the ram motion detection means 3B. When moving to (2) ′ and arriving at the position (2) ′, the predicted arrival position (3) ′ of the ram 20 is detected on the assumption that it has subsequently moved at the same high speed V _PH .

  In this case, when the actual position (1) ((2)) of the finger F of the hand and the expected position (3) ′ of the ram 20 are compared, Z4 which is the actual position (1) of the finger F is obtained. However, the danger point a of the ram 20 is clearly below.

Therefore, the ram / body interference predicting means 3D (FIG. 2) determines that the ram 20 and the finger F of the ram 20 interfere with each other when the ram 20 is in the position (2) ′. 2) The ram 20 is switched from the high speed V _PH to the low speed V _PL at Z5 which is the machine stop point b in 2 ′ ′.

Further, the ram / body interference predicting means 3D (FIG. 2), after the ram 20 is switched to the low speed V _PL , the ram 20 at the safe distance expected position (4) ′ where the safe distance c at the low speed V _PL becomes small. It is detected that the danger point a reaches Z4 which is the actual position (1) of the finger F of the hand.

As a result, the ram / body interference prediction means 3D sends the ram control signal S4 for suddenly stopping the ram 20 at the safe distance expected position (4) ′ at the low speed V _PL as described above. In this case, the ram motion detection means 3B (FIG. 2) is not limited to the linear encoder 4 and detects the position and speed of the ram 20 using the CCD camera 6 in the same manner as the finger F of the hand. As described above, the detected position and velocity are sent to the ram / body interference prediction means 3D.

  FIG. 9 is a diagram showing another embodiment of the first invention. The method for determining the descending speed of the ram 20 is different from that in FIGS. 3 to 8, in other words, the first monitoring device 3 is ( 1) The ram lowering speed control content of the ram control signal S4 (FIG. 7) sent to the main unit 2 by the ram / body interference prediction means 3D (FIG. 2) is different.

That is, as shown in FIG. 9, with reference to a line connecting the tip of the punch P and the center of the V groove of the die D, the coordinate axis is taken on the operator side (right side in FIG. 9), and the object, for example, the finger F wherein the tip coordinates X detected by the image processing is captured by the CCD camera 6 (FIG. 1), based on the coordinates of the tip X of the detected, to control the lowering speed V _R of the ram 20.

In this case, the relationship between the tip coordinate X of the finger F of the hand and the descending speed V _R of the ram 20 is shown in FIG. 10, for example, and the descending speed of the ram 20 as the hand finger F approaches the molds P and D. V _R becomes smaller, so that the safety of workers is ensured.

The relationship between the tip coordinate X of the finger F of the hand shown in FIG. 10 and the descending speed V _R of the ram 20 may be stored as a database in the storage means 3G (FIG. 2) constituting the first monitoring device 3. Alternatively, before processing, the operator may arbitrarily set the input via the input means 3E according to his / her skill level.

As a data capturing method, as shown in FIG. 11, both the ram 20 and the finger F of the hand are captured in the imaging range S of the CCD camera 6, and the body motion detecting means 3C is shown in the XZ coordinates shown in FIG. , The ram motion detection means 3B uses the tip coordinates X at the positions (1) and (2) on the X-axis coordinates of the finger F of the hand to determine the positions (1) ′ and (2) ′ The descending speed V _{R at} is detected by image processing.

  When the ram / body interference prediction means 3D (FIG. 2) determines the interference between the ram 20 and the finger F of the hand, FIG. 10 is used.

For example, if the tip coordinates X of the finger F of the hand (FIG. 10) is 0, the lowering speed V _R is also 0 of the ram 20, i.e. the ram 20 is stopped, the tip coordinates X of the finger F of the hand, 0 <X if ≦ 20 mm, the lowering speed V _R of the ram 20 is such that as 5 mm / sec, is lowered by controlling the velocity V _R, ram body interference prediction unit 3D of the ram 20 in accordance with the coordinates of the tip X (FIG. 2 ), A ram control signal S4 (FIG. 1) containing the descending speed V _R of the ram 20 is sent to the main unit 2, and the main unit 2 is connected to the pressure control valve 8 and the speed as described above. The hydraulic cylinder 5 is driven by controlling the control valve 7, and the ram 20 is lowered at a predetermined speed.

  3 to 8, the linear encoder 4 (FIG. 1) is used as a method for fetching data about the ram 20. However, when the linear encoder 4 fails, the data of the ram 20 is stored. The present embodiment using the CCD camera 6 for capturing also has an effect (FIG. 11).

  12 (FIGS. 13 to 16) and FIG. 17 (FIGS. 18 to 22) are application examples of the first invention. The former (FIG. 12) includes the operator T and the moving tables 70A and 70B or the workpiece W. The latter (FIG. 17) avoids the interference between the worker T and the robot 91 or the workpiece W, thereby ensuring the safety of the worker T.

  As is well known, the turret punch press shown in FIG. 12 (A) has a punch die P and a die die D that are concentrically arranged on an upper turret 80 and a lower turret 81. By rotating the turrets 80 and 81 synchronously, desired dies P and D are selected immediately below the ram cylinder 82, and the punch dies P are pressed by the ram cylinder 82 to cooperate with the die dies D. The workpiece W is subjected to predetermined punching.

  In this case, the workpiece W is gripped by a clamp 73 as shown in the figure, and the clamp 73 is attached to a carriage 72. The carriage 72 is a ball of an X-axis motor Mx mounted on the carriage base 71. The carriage base 71 is screwed to the screw 75 and is slidably coupled to the Y-axis guide 76. The carriage base 71 is screwed to the ball screw 74 of the Y-axis motor My installed in the machine body and the X-axis. The guide 78 is slidably coupled.

  With this configuration, when the X-axis motor Mx and the Y-axis motor My are driven, the carriage base 71 is accompanied by the side tables 70A and 70B on both sides of the center table 70 in the X-axis direction, and the carriage 72 is Since each moves in the Y-axis direction on the base 71, the workpiece W held by the clamp 73 can be positioned at a predetermined position.

  However, when the carriage base 71 moves in the X-axis direction, as described above, the side tables 70A and 70B also move in the same direction (for example, the moving area is between X1 and X2), so that it is in the vicinity of the turret punch press. If there is an object, for example, worker T (worker T monitors the machining state during machining and exchanges molds P, D, etc. after machining), the worker T moves as described above. There is a risk of interference with the side tables 70A and 70B.

  Further, when the workpiece W is large enough to protrude from the side tables 70A and 70B, the worker T and the workpiece W may interfere with each other.

  Therefore, after the CCD camera 6 is installed on the upper frame 83 of the turret punch press and in the vicinity of the turrets 80 and 81, the operating state of the worker T is imaged by the CCD camera 6 (step of FIG. 16). 405) The position and speed of the worker T are calculated by image processing (step 406 in FIG. 16), and it is determined whether or not they interfere with the carriage base 71 and the workpiece W (step 407 in FIG. 16). In the case of interference (YES in step 407 in FIG. 16 → YES in step 409), by issuing an alarm or the like, the machine is stopped (step 411 in FIG. 16) to ensure the safety of the worker T. did.

  Whether or not the worker T described above interferes with the carriage base 71 and the workpiece W is determined based on whether or not the worker T may enter the dangerous area K (FIGS. 13 to 15).

For example, as shown in FIG. 12 (B), if the workpiece W held by the clamp 73 is to be drilled, the first round hole W1, the second rectangular hole W2,. As machining progresses with the square hole W _n , the carriage base 71 moves in the X-axis direction (left side), so that the entire workpiece W also moves in the same direction. At this time, the side tables 70A and 70B also move in the same direction. Move to.

  If the workpiece W is not so large and does not protrude from the side tables 70A and 70B, the worker T may interfere with the side table 70A, for example.

  In this state, for example, when processing is started for the second hole W2 (FIG. 12B) (step 401 in FIG. 16), the position and speed of the carriage base 71 at that time are determined in advance by NC data. (For example, it is stored in the main device 2 (FIG. 1)).

Therefore, for example, as shown in FIG. 13, on the XY coordinates where the origin position of the carriage base 71 is the origin 0, the position (1) ′, ( 2) ′, (3) ′ and the speed V _S can be detected (step 402 in FIG. 16).

At the same time, as described above, the CCD camera 6 attached to the upper frame 83 is used to image the operation state of the worker T (step 405 in FIG. 16), thereby, as shown in FIG. The position (1), (2), (3) and speed V _T of the worker T are calculated by image processing.

Then, the position (3) ′ (the second hole W2 on the workpiece W (FIG. 12B)) where the front end of the side table 70A (FIG. 13) has moved most is the ram cylinder 82 (FIG. 12A). ))) Is predicted as a dangerous area K (step 404 in FIG. 16), and whether or not the worker T moving at the speed V _T may enter this dangerous area K is determined. Is determined (step 407 in FIG. 16).

  In this case, the worker T does not stop, and the worker T determines that there is a possibility of entering the dangerous area K (YES in step 407 in FIG. 16) and immediately interferes (FIG. 16). As described above, the machine is stopped (step 411 in FIG. 16), the process returns to step 401, and the machining is started again.

In the case of FIG. 14, similarly, the CCD camera 6 images the operation state of the worker T. However, the worker T is away from the moving range of the side table 70A by a predetermined distance L at a speed V _T. Since it is moving, the operator T may enter the dangerous area K (YES in step 407 in FIG. 16), but does not interfere immediately (NO in step 409 in FIG. 16), and decelerates the machine. As a result (for example, the rotational speed of the drive motor Mx of the carriage base 71 (FIG. 12A) is reduced to reduce the moving speed V _T of the side table 70A), and the processing is continued (Step 410 in FIG. 16 → Step 408).

In the case of FIG. 15, similarly, the CCD camera 6 images the operation state of the worker T. However, the operation state of the worker T overlaps at the positions (1) to (3), and the speed V _T. = 0, so that there is no possibility that the operator T enters the dangerous area K (NO in step 407 in FIG. 16), and the machining is continued as it is (step in FIG. 16). 408).

  The operation of the application example (FIGS. 12 to 15) of the first invention will be described below with reference to FIG.

  In step 401 of FIG. 16, when machining is started, the position and speed of the carriage base 71 are detected in step 402, the position and speed of the workpiece W are detected in step 403, and the dangerous area K is predicted in step 404. At the same time, in step 405, the operator T's motion state is imaged, and in step 406, the position and speed of the worker T are calculated by image processing. After that, the worker T may enter the danger area K in step 407. Judge whether there is.

  That is, the means corresponding to the ram operation detecting means 3B in FIG. 2 detects the position and speed of the carriage base 71 and the position and speed of the workpiece W based on the NC data, and predicts the dangerous area K.

  In this case, as described above, the carriage base 71 moves with the side tables 70A and 70B, and it is the side table 70A (for example, FIG. 13) that actually interferes with the worker T. Based on the position and speed of the carriage base 71, the position and speed of the side table 70A are detected.

  Further, the dangerous area K is the most moved position of the tip of the side table 70A and the work W closer to the operator T (for example, in the case of FIG. 13, the position (3) ′ of the side table 70A). These are also determined based on the work information, machine information, etc. constituting the NC data.

  At the same time, the means corresponding to the body motion detecting means 3C in FIG. 2 inputs the operation status of the worker T imaged by the CCD camera 6, and calculates the position and speed of the worker T by image processing.

  Then, a means corresponding to the ram / body interference prediction means 3D of FIG. 2 determines whether or not the operator T may enter the dangerous area K based on, for example, FIGS.

  Thereafter, when it is determined in step 407 in FIG. 16 that the operator T has no possibility of entering the dangerous area K (NO), the processing is continued in step 408, and if there is a possibility ( YES), in step 409, it is determined whether or not interference occurs immediately. If there is no interference (NO), after the machine is decelerated in step 410, processing is continued in step 408. (YES) After stopping the machine in step 411, the process returns to step 401 and the machining is resumed.

That is, the means corresponding to the ram / body interference predicting means 3D in FIG. 2 has a possibility that the worker T has stopped at the speed V _T as shown in FIG. When it is determined that there is no machining, the machining is continued by transmitting machining continuation signals to the X-axis motor Mx and the Y-axis motor My (see FIG. 12A) and the ram cylinder 82, as shown in FIG. In addition, since the operator T is moving at a speed V _T away from the side table 70A by a predetermined distance L, if it is determined that there is no immediate interference with the side table 70A, for example, an X-axis motor A deceleration signal is transmitted to Mx (FIG. 12 (A)) to decelerate the speed V _T of the side table 70A, and as shown in FIG. 13, if the operator _T moves at this speed V _T , the side table 70A If it is determined that interference will occur immediately The, for example, by sending a stop signal to the X-axis motor Mx (Fig. 12 (A)) to stop the side table 70A.

  On the other hand, the robot 91 shown in FIG. 17 is installed in front of the press brake 1 described above, grips the workpiece W stacked on the material table (not shown), and supplies and positions the press brake 1 after hydraulic pressure. The cylinder 5 is operated, the upper table 21 is lowered, the workpiece W is subjected to a predetermined bending process by the punch P and the die D, and the processed product is released on a product table (not shown). Yes.

  In this case, the workpiece W is gripped by a grip 92 of a robot 91 as shown in the figure, the robot 91 is attached to a slider 93, and the slider 93 is along a base 90 attached to the front of the lower table 21. Thus, it moves in the left-right direction (X-axis direction).

  However, when the robot 91 moves in the X-axis direction (FIG. 18A) (for example, the movement area is between X3 and X4), there is a possibility that it interferes with the worker T near the press brake 1, for example.

  Further, as illustrated, when the workpiece W is large enough to protrude from the robot 91, the worker T and the workpiece W may interfere with each other.

  Therefore, after imaging the operation state of the worker T by the CCD camera 6 installed in the press brake (step 505 in FIG. 22), the position and speed of the worker T are calculated by image processing (step 506 in FIG. 22). ) To determine whether or not to interfere with the robot 91 or the workpiece W (step 507 in FIG. 22), and in the case of interference (YES in step 507 → YES in step 509 in FIG. 22), issue an alarm or the like. Thus, the machine is stopped (step 511 in FIG. 22), and the safety of the worker T is ensured.

  Whether or not the worker T described above interferes with the robot 91 or the workpiece W is similarly determined based on whether or not there is a possibility that the worker enters the dangerous area (FIGS. 19 to 21).

  For example, as shown in FIG. 18B, when the workpiece W held by the grip 92 of the robot 91 is bent along the bending line a, the bending line portions a1, a2, and a3 have flanges having the shapes shown in the drawings. Assuming that F1, F2, and F3 are set up, the length (width in the X-axis direction) of the molds P and D to be used is different (see FIG. 18A). The workpiece W moves to the mold stations ST1, ST2, and ST3. At this time, the workpiece W gripped by the grip 92 of the robot 91 is also moved in the same direction.

  If the workpiece W is so large that it protrudes from the robot 91 as described above, there is a possibility of interference with both the robot 91 and the workpiece W depending on the operation state of the operator.

  In this state, for example, when machining is started for the first flange F1 (FIG. 18B) (step 501 in FIG. 22), the position and speed of the robot 91 and the workpiece W at that time are similarly determined in advance. It can be seen from the NC data (for example, stored in the main unit 2 (FIG. 1)).

Accordingly, for example, as shown in FIG. 19, the positions (1) ″, (2) ″, (3) ″ of the tip of the robot 91 on the XY coordinates with the origin position of the robot 91 as the origin 0 It is possible to detect the velocity V _B , the position (1) ′ ″, (2) ′ ″, (3) ′ ″ and the velocity V _W (the same as the velocity V _{B of the} robot 91) of the workpiece W. (Step 502 and Step 503 in FIG. 22).

At the same time, as described above, for example, the CCD camera 6 attached to the press brake 1 (FIG. 17) images the operation state of the worker T approaching from the front of the press brake 1, for example (FIG. 22). Step 505), thereby calculating the positions (1), (2), (3) of the worker T and the velocity V _Ty by image processing, as shown in FIG.

In this case, when the CCD camera 6 captures another worker T 'approaching from the lateral direction of the press brake 1, the operation state of the worker T' is similarly imaged (step of FIG. 22). 505) Thus, as shown in FIG. 19, the positions (1) ′, (2) ′, (3) ′ and the speed V _Tx of the worker T ′ are calculated by image processing.

Then, the position (3) ″ (the bending line portion a1 (FIG. 18B) where the first flange F1 on the workpiece W is to be formed) is moved to the mold station ST1 (FIG. 18). (A)) When positioned, the dangerous area K _B for the robot 91 and the position (3) ′ ′ where the tip of the work W has moved the most are designated as the dangerous area K _W for the work _W. (Step 504 in FIG. 22), and whether the workers T and T ′ moving at the speed V _Ty (FIG. 19) and V _Tx may enter these dangerous areas K _B and K _W. It is determined whether or not (step 507 in FIG. 22).

In this case, the workers T and T ′ do not stop, the worker T can enter the danger area K _B for the robot 91, and the worker T ′ can enter the danger area K _W for the workpiece _W , respectively. 22 (YES in step 507 in FIG. 22), and because there is immediate interference (YES in step 509 in FIG. 22), as described above, the machine is stopped (step 511 in FIG. 22). Returning to step 501, machining is started again.

In the case of FIG. 20, similarly, the CCD camera 6 images the operation status of the workers T and T ′, but both the T and T ′ are separated from the movement range of the robot 91 by a predetermined distance M. , and since moving at the same speed V _Tx, there is a possibility to enter the hazardous area K _B of the robot 91 (step 507 in FIG. 22 YES), rather than be immediately interference (step 509 in FIG. 22 NO), by decelerating the machine (for example, by reducing the rotational speed of the X-axis drive motor (not shown) of the robot 91 to reduce the moving speed V _B of the robot 91), the machining is continued (step of FIG. 22). 510 → step 508).

In the case of FIG. 21, similarly, the CCD camera 6 images the operating conditions of the workers T and T ′, but the operating conditions of both the T and T ′ indicate positions (1) to (3), (1 ) ′ To (3) ′, and since the speed V _Ty = V _Tx = 0, both T and T ′ are stopped, so there is no possibility of entering the dangerous areas K _B and K _W. (NO in step 507 in FIG. 22), the machining is continued as it is (step 508 in FIG. 22).

  The operation of another application example (FIGS. 17 to 21) of the first invention will be described below with reference to FIG.

  When the machining is started in step 501 in FIG. 22, the position and speed of the robot 91 are detected in step 502, the position and speed of the workpiece W are detected in step 503, the dangerous area is predicted in step 504, and at the same time, At 505, the operator's operation state is imaged. At step 506, the worker's position and speed are calculated by image processing. Then, at step 507, it is determined whether or not there is a possibility that the worker enters the danger area.

  That is, the means corresponding to the ram motion detecting means 3B in FIG. 2 detects the position and speed of the robot 91 and the position and speed of the workpiece W based on the NC data, and predicts the dangerous area.

In this case, when the critical area K _B of the robot 91, the critical region K _W of the workpiece W is the most moved position of each operator T, the tip closer by T '(e.g., FIG. 19, the robot 91 (3) ″, position (3) ′ ″) of the workpiece W, workpiece information constituting the NC data, machine information, and the like.

  At the same time, a means corresponding to the body motion detection means 3C in FIG. 2 inputs the operation status of the workers T and T ′ imaged by the CCD camera 6, and performs image processing on the positions and velocities of both T and T ′. Calculated by

Then, a means corresponding to the ram / body interference prediction means 3D in FIG. 2 determines whether or not the workers T and T ′ may enter the dangerous areas K _B and K _W , for example, in FIGS. Judgment based on.

Thereafter, when it is determined in step 507 in FIG. 22 that there is no possibility that the workers T and T ′ will enter the dangerous areas K _B and K _W (NO), the processing is continued in step 508. If yes (YES), in step 509, it is determined whether or not to immediately interfere. If not (NO), the machine is decelerated in step 510, and then processing is continued in step 508. If the interference occurs (YES), after stopping the machine in step 511, the process returns to step 501 to resume the processing.

That is, as shown in FIG. 21, the means corresponding to the ram / body interference prediction means 3D in FIG. 2 is stopped because the workers T and T ′ are at speeds V _Ty and V _Tx of 0. When it is determined that there is no possibility of entering the dangerous areas K _B and K _W , the machining is continued by transmitting a machining continuation signal to the hydraulic cylinder 5 (FIG. 17) and the robot drive mechanism (not shown). As shown in FIG. 20, since the workers T and T ′ are moving at the same speed V _Tx away from the robot 91 by a predetermined distance M, it is determined that they do not interfere with the robot 91 immediately. In this case, for example, a deceleration signal is transmitted to the X-axis drive motor (not shown) of the robot 91 to decelerate the speed V _{B of the} robot 91, and as shown in FIG. velocity V _Ty, if moved V _Tx, the former T and the robot 91 The latter T 'if it is determined that the immediately interferes with the workpiece W, for example, sends a stop signal to the X-axis drive motor to stop the work W gripped robot 91 and its.

  23 to 27 show a case where the present invention is applied to a sheet metal processing system. As shown in FIG. 23, the sheet metal processing system includes, for example, a material warehouse, a turret punch press, a press brake, a product warehouse, and the like. The sheet metal processing machine is configured to avoid the interference between any of the sheet metal processing machines and the worker T, thereby ensuring the safety of the worker T.

  In FIG. 23, the material warehouse is, for example, a workpiece picking device, a plurality of workpieces W are stacked on the hydraulic lifter 54, and the material warehouse has a guide rail 50 extending to an adjacent turret punch press. The loader is movably attached to the guide rail 50 (FIG. 26).

  The loader includes a slider 51 slidably coupled to the guide rail 50, a stretch 52 attached to the slider 51 via an upper and lower cylinder 55, and a suction pad 53 attached to the stretch 52. 53, the workpieces W on the hydraulic lifter 54 are sucked one by one and carried into a turret punch press.

  In the turret punch press, the workpiece W carried from the loader of the material warehouse is re-gripped by the clamp 73, and as described in detail in FIG. 12A, the upper turret 80 and the lower turret 81 are rotated synchronously during processing. Thus, the desired dies P and D are selected directly below the ram cylinder 82, the punch dies P are pressed by the ram cylinder 82, and the workpiece W gripped by the clamp 73 is cooperated with the die dies D. Is subjected to a predetermined punching process.

  A loading / unloading robot 56 is installed at the boundary between the turret punch press and the press brake, and the loading / unloading robot 56 grips the workpiece W processed by the turret punch press and is installed in front of the press brake. As shown in detail in FIG. 17, the bending robot 91 supplies and positions the workpiece W to the press brake, and then performs a predetermined bending process with the punch P and the die D.

  The processed product Q is transferred from the bending robot 91 to the loading / unloading robot 56 via a product table (not shown), and the loading / unloading robot 56 receives the product Q on a product warehouse, for example, a belt conveyor 57. The product Q is manually taken out by the worker T or placed on a truck (not shown) or the like and transported to the outside.

  Each of the sheet metal processing machines has main body NC devices 2A, 2B, 2C, and 2D corresponding to the main body NC device 2 in FIG. 1, and CCD cameras 6A, 6B, 6C, and 6D corresponding to the CCD camera 6 in FIG. (A single CCD camera may be common to each sheet metal processing machine).

  In this case, the carry-in / out robot 56 shown in FIG. 23 is controlled by the press brake main body NC device 2C for convenience, and is installed in a zone C described later.

  Based on the data from the main body NC devices 2A to 2D and the CCD cameras 6A to 6D, a predetermined process is performed to monitor the operation state of the worker T, and predetermined machine control is performed on the main body NC devices 2A to 2D. As shown in FIG. 24, the first monitoring device 3 that transmits the signal S11 includes machine operation information detection means 3B ′, worker position detection means 3C ′, and dangerous state prediction means 3D ′.

  Among these, the machine operation information detection means 3B ′ is based on the electric signal S10 transmitted from each of the main body NC devices 2A to 2D, for example, information indicating the operation state of each sheet metal processing machine such as the material warehouse, for example, in operation (ON) or information indicating whether the vehicle is stopped (OFF) (step 702 in FIG. 27).

  The worker position detecting means 3C ′ detects position information indicating in which zone A, B, C, D the worker T is present based on the electric signal S1 transmitted from the CCD cameras 6A to 6D. (Step 703 in FIG. 27).

  In this case, as shown in FIG. 23, zones A, B, C, and D are set around each sheet metal processing machine, and each of the CCD cameras 6A to 6D has the respective zones A, B, C, and D as a whole. Is detected by the operator position detection means 3C ′ by image processing, which is controlled by each of the main body NC devices 2A to 2D and captured by the CCD cameras 6A to 6D.

  Further, the worker position detection means 3C ′ includes not only the zones A, B, C and D (FIG. 25) described above but also the positions in the zones A, B, C and D as the position information of the worker T. A predetermined position, for example, in the vicinity of the machine (position 2 to 3 m away from the machine), in the middle (position 5 to 6 m away from the machine), or far away (position 10 m or more away from the machine), The speed and direction of movement can also be detected (step 703 in FIG. 27).

  Further, the dangerous state prediction means 3D ′ is based on the machine operation information and worker position information detected by the machine operation information detection means 3B ′ and the worker position detection means 3C ′, and a data table (FIG. 25) described later. Predict dangerous situations.

  With this configuration, as described above, machine operation information is input from the main body NC devices 2A to 2D, and worker position information is input from the CCD cameras 6A to 6D to the first monitoring device 3 in FIG. The machine operation information detecting means 3B ′ (FIG. 24) constituting the first monitoring device 3 detects machine operation information, and the worker position detecting means 3C ′ detects the position of the worker T (steps 702 and 703 in FIG. 27). Further, based on the detected information, the dangerous state prediction means 3D ′ predicts a dangerous state while searching a predetermined data table (FIG. 25) (step 704 in FIG. 27).

  As a result, the dangerous state prediction means 3D ′ (FIG. 24) determines whether or not the operator T may enter the dangerous state (step 705 in FIG. 27). 27 (YES in step 705), for example, if the most dangerous state (risk level α) (YES in step 707 in FIG. 27) due to the stage of the dangerous state, the corresponding machine is suddenly stopped (step 709 in FIG. 27). Then, if it is the next dangerous state (risk level β) (NO in step 707 in FIG. 27), an alarm is generated (or the machine is decelerated) (step 708 in FIG. 27). Is to be secured.

  In this case, whether or not it is in a dangerous state is determined based on the worker information constituting the predetermined data table (FIG. 25) stored in the storage means 3G (FIG. 24) and the machine operation information in advance. The machine control signal corresponding to the state, in other words, the contents of commands for each sheet metal working machine shown in FIG. 23 can be understood.

  Among these, the worker information is composed of the illustrated position, speed, and moving direction.

  As described above, the position of the worker T is as follows. In FIG. 23, the worker T is located in the zones A, B, C, and D, and in each zone A, B, C, and D. It is information representing whether the machine is near, intermediate or far, and the electric signal S1 sent from each of the CCD cameras 6A to 6D is calculated by the worker position detection means 3C ′ (FIG. 24) through image processing, Similarly, the worker position detection means 3C ′ calculates the speed and moving direction of the worker T by image processing.

  Also, the machine operation information (FIG. 25) is information indicating the operation state of the material warehouse, turret punch press (TP), press brake (PB), and product warehouse shown in FIG. If it is “OFF” during operation, it means that it is stopped, and the machine operation information detection means 3B ′ detects (FIG. 24) based on the electric signal S10 sent from each main body NC device 2A-2D. .

  Further, the machine control signal (FIG. 25) is a command content to the material warehouse, turret punch press (TP), press brake (PB), and product warehouse shown in FIG. 23 according to the worker information and machine operation information described above. For example, “continue” means to continue the operation as before, “sudden stop” means to stop the operation of the material warehouse, etc., and “alarm” means, for example, on the screen of the output means 3F (FIG. 24). Means flashing the red alarm signal.

With this configuration, for example, machine operation information and worker position information are detected by the machine operation information detection means 3B ′ (FIG. 24) and worker position detection means 3C ′, respectively, and each information is sent to the dangerous state prediction means 3D ′. When transmitted, the dangerous state predicting means 3D ′, for example, is located in the vicinity of the machine with the worker T in the zone A, and the speed of the worker T is determined based on information from the worker position detecting means 3C ′. Is V _Y , the moving direction is approaching the material warehouse installed in Zone A, and the material warehouse is “ON”, that is, it is operating from the information about the material warehouse in the machine operation information Suppose that.

  Based on this result, the dangerous state predicting means 3D ′ accesses the data table (FIG. 25) and searches for the corresponding degree of risk. From the right end of the first row shown in the figure, the most dangerous state is detected. It is detected that the risk is α.

  In this case, more specifically, the worker T (FIG. 23) approaches the material warehouse in the zone A, for example, the guide rail 50 on which the slider 51 of the loader (FIG. 26) travels, and the suction pad There is a possibility of interfering with the workpiece W adsorbed at 53, which is in the most dangerous state and has a danger level α.

  In the case of this risk level α (FIG. 25), the contents regarding the material warehouse in the machine control signals constituting the data table are “sudden stop” as shown in the figure.

  Therefore, in this case, as a result of predicting the dangerous state based on the data table, the dangerous state predicting means 3D ′ determines that the dangerous state α is in the most dangerous state as described above, and the worker T may enter a dangerous state (YES in step 705 in FIG. 27) and is in the most dangerous state (YES in step 707 in FIG. 27). A machine control signal S11 (FIG. 24) having the content “sudden stop” is transmitted, whereby the main body NC device 2A suddenly stops the material warehouse, and the safety of the operator T is ensured.

Further, the dangerous state predicting means 3D ′ is based on the data from the machine operation information detecting means 3B ′ and the worker position detecting means 3C ′, and the worker T exists in the zone A of the material warehouse and in the vicinity of the machine. However, it is assumed that the speed is V _X , it is translated, that is, it is moved in parallel with a certain distance from the material warehouse, and it is found that the material warehouse is “ON”, that is, in operation.

  Similarly, on the basis of this result, the dangerous state predicting means 3D ′ accesses the data table (FIG. 25) and searches for the corresponding degree of risk from the right end of the second row shown in the figure. Next, it is detected that the degree of danger is β.

  In this case, more specifically, the worker T (FIG. 23) exists in the zone A as described above, but moves away from the material warehouse (in the X-axis direction). There is no risk of immediate interference with the material warehouse, and the risk is β.

  In the case of this risk level β (FIG. 25), the contents relating to the material warehouse in the machine control signals constituting the data table are “alarms” as shown in the figure.

  Accordingly, in this case, as a result of predicting the dangerous state based on the data table, the dangerous state predicting means 3D ′ determines that the risk level β is the next dangerous state as described above, and the operator Although T may enter a dangerous state (YES in step 705 in FIG. 27), it is not in the most dangerous state (NO in step 707 in FIG. 27). The machine control signal S11 (FIG. 24) having the content of the “alarm” is transmitted, whereby the main body NC device 2A decelerates the material warehouse, for example, and the safety of the worker T is ensured.

  Further, the dangerous state predicting means 3D ′ is based on the data from the machine operation information detecting means 33B ′ and the worker position detecting means 3C ′, and the worker T exists in the zone A of the material warehouse and in the vicinity of the machine. However, it is assumed that the speed is 0 and the material warehouse is “ON”, that is, it is operating.

  Similarly, on the basis of this result, the dangerous state predicting means 3D ′ accesses the data table (FIG. 25) and searches for the corresponding degree of risk. From the right end of the third row shown in the figure, It is detected that the danger state is the lowest danger level γ.

  In this case, more specifically, the worker T (FIG. 23) exists in the zone A as described above, but the speed is 0 and remains in one place. There is no risk of interfering with the warehouse, and the risk is γ.

  And in the case of this risk level (gamma) (FIG. 25), the content regarding the material warehouse of the machine control signal which comprises a data table is "continue" as shown in the figure.

  Therefore, in this case, as a result of predicting the dangerous state based on the data table, the dangerous state predicting means 3D ′ determines that the dangerous degree γ is the lowest as described above, and the operator T Is not likely to enter a dangerous state (NO in step 705 of FIG. 27), the machine control signal S11 (FIG. 24) having the content of “continue” is transmitted to the main body NC unit 2A of the material warehouse, Thereby, the main body NC device 2A continues the operation of the material warehouse as before (step 706 in FIG. 27).

  The operation of the application example (FIGS. 23 to 26) to the sheet metal processing system of the first invention will be described below with reference to FIG.

  When the operation is started in step 701 in FIG. 27, the machine operation information is detected in step 702, the position (speed, moving direction) of the worker T is detected in step 703, and based on the data table in step 704. In step 705, it is determined whether or not there is a possibility that the worker T enters the dangerous state.

  In this case, in the sheet metal processing system (FIG. 23), for example, the workpiece W stored in the material warehouse (FIG. 26) is sucked by the suction pad 53 of the loader as described above and is carried into the turret punch press. Thereafter, the workpiece W is subjected to drilling, and then held by the loading / unloading robot 56 (FIG. 23) and transferred to the bending robot 91, and the box bending product Q is processed (FIG. 26) by the press brake. Assume that the robot is again gripped by the bending robot 91 and placed on the belt conveyor 57 of the product warehouse.

  During the operation, as described above, the machine operation information detecting means 3B ′ constituting the first monitoring device 3 in FIG. 24 performs the machine operation information based on the signals S10 from the main body NC devices 2A to 2D. The worker position detecting means 3C ′ determines the position of the worker T (in the zones A, B, C, D and the zones A, B, C, D) based on the signals S1 from the CCD cameras 6A to 6D. ), And further, the speed and the moving direction are detected (steps 702 and 703 in FIG. 27), and based on the detected information, the dangerous state prediction means 3D ′ searches the data table (FIG. 25). While predicting dangerous situations.

  Then, as described above, the danger state prediction means 3D ′ searches the data table to determine the danger levels α, β, γ, and thereafter, in step 705 of FIG. , Γ, it is determined whether or not there is a possibility that the worker T enters a dangerous state.

  For example, in the case of the danger level α, there is a possibility that the worker T enters a dangerous state (YES in step 705 in FIG. 27) and is in the most dangerous state (YES in step 707 in FIG. 27). A machine control signal S11 (FIG. 24) containing “sudden stop” (FIG. 25) is transmitted to the corresponding sheet metal processing machine, for example, the main body NC device 2A of the material warehouse. Since the material warehouse is suddenly stopped (step 709 in FIG. 27), the safety of the worker T is ensured.

  In this case, for example, after suddenly stopping the material warehouse (step 709 in FIG. 27), the main body NC device 2A (FIG. 23) resumes the operation of the material warehouse (step 701 in FIG. 27).

  For example, in the case of the risk level β, the worker T may enter a dangerous state (YES in step 705 in FIG. 27), but is not in the most dangerous state (in step 707 in FIG. 27). NO), a machine control signal S11 (FIG. 24) containing “alarm” (FIG. 25) is transmitted to the corresponding sheet metal working machine, for example, the main body NC device 2A of the material warehouse, and thereby the main body NC device Since 2A decelerates the material warehouse, the safety of the worker T is ensured and the operation is continued in the decelerated state (step 706 in FIG. 27).

  Further, for example, in the case of the danger level γ, there is no possibility that the worker T enters the dangerous state (NO in Step 705 in FIG. 27), so that the corresponding sheet metal processing machine, for example, the main body NC device 2A of the material warehouse is used. Then, a machine control signal S11 (FIG. 24) containing “Continue” (FIG. 25) is transmitted, whereby the main body NC device 2A continues to operate the material warehouse as before (step 706 of FIG. 27). ).

  In FIG. 28, reference numeral 1 is a bending machine similar to that in FIG. 1, 22 is a main body NC device, and 30 is a second monitoring device.

  Among these, the bending machine 1 is provided with a CCD camera 6 constituting an image recognition device, and in cooperation with a mold length measuring means 30C constituting a second monitoring device 30 (FIG. 29) described later, The length L is measured.

  The main body NC device 22 of the bending machine 1 having the above configuration controls the ram operation switching valve 12 to circulate the hydraulic oil between the oil tank 13 and the hydraulic cylinder 5, thereby controlling the ram 20 to move up and down. A predetermined bending process is performed on the workpiece W with the die D.

  Further, the main body NC device 22 outputs work information and the like as a signal S3 to the second monitoring device 30.

  Based on this information and the signal S1 from the CCD camera 6, the second monitoring device 30 compares the measured mold length L with the mold length determined by itself, both differ, and an alarm or ram stops. When the signal S7 is output, the main body NC device 22 inputs the signal S7, thereby controlling the ram operation switching valve 12 to stop the ram 20.

  At this time, similarly to the second monitoring device 30, the main body NC device 22 inputs the signal S1 from the CCD camera 6, thereby monitoring the operation of the second monitoring device 30 and driving the CCD camera 6. In order to measure the mold length L, the entire mold is taken into view.

  Further, in the main body NC device 22, the second monitoring device 30 measures the pressure during the bending process based on the signal S5 from the pressure sensor 11, and the upper limit pressure = Q1 × based on the measured pressure Q1 (FIG. 30). When 1.1 is set, it is input as a signal S8 to transmit a pressure setting signal S9 to the pressure control valve 14 (relief valve).

  As a result, when the pressure of the ram 20 during bending increases and exceeds the upper limit pressure = Q1 × 1.1 (FIG. 30), the hydraulic oil pumped up by the hydraulic pump 16 is returned to the oil tank 15, By stopping the operation of the ram 20, damage to the mold is prevented.

  That is, conventionally, the die pressure resistance is calculated by multiplying the die length by the pressure resistance per unit length (ton / mm), and this is set as the upper limit pressure.

  However, the pressure resistance per unit length is specified by the manufacturer and is set to be quite high in view of the safety factor. Therefore, the conventional mold pressure resistance (FIG. 30) is too high as a threshold, for example 2 Even if the pressure is increased after the sheet is machined, it cannot be detected.

  On the other hand, according to the present invention, the pressure is actually measured during the bending process (step 210 in FIG. 31), and the upper limit pressure = Q1 × 1.1 is calculated based on this measured pressure Q1 (in FIG. 31). Step 215), a threshold value lower than the conventional value can be set (FIG. 30).

  Therefore, even if the pressure is increased after two sheets are processed, it can be easily detected, and damage to the mold can be prevented.

  The second monitoring device 30 (FIG. 28) monitors whether or not the operator is using a regular mold, and if not (NO in step 205 in FIG. 31), an alarm or ram A stop signal S7 (step 213 in FIG. 31) is issued to stop the ram 20.

  This second monitoring device 30 (FIG. 29) includes a CPU 30A, a bending order / mold / mold layout determining means 30B, a mold length measuring means 30C, a comparing means 30D, an alarm means 30E, and a pressure calculation. The unit 30F, the input unit 30G, the output unit 30H, and the storage unit 30J are included.

  The CPU 30A performs overall control of the entire apparatus of FIG. 29, such as the bending order / mold / mold layout determining means 30B and the mold length measuring means 30C, in accordance with the operation procedure of the second invention (FIG. 31).

  The bending order / die / die layout determining means 30B determines the bending order, the die, and the die layout based on the workpiece information input from the main body NC device 22 (step 201 in FIG. 31). (Step 202 in FIG. 31).

  The mold length measuring means 30C measures the mold length L based on the imaging signal S1 transmitted from the CCD camera 6 attached to the bending machine 1 (FIG. 28) (step 204 in FIG. 31).

  The comparison unit 30D compares the mold length determined by the bending order / mold / mold layout determination unit 30B with the mold length L measured by the mold length measurement unit 30C (FIG. 31). Step 205).

  The alarm means 30E issues an alarm or a ram stop signal S7 (step 213 in FIG. 31) when both the mold lengths are different (NO in step 205 in FIG. 31) as a result of the comparison by the comparison means 30D. It is sent to the main body NC device 22.

  As described above, the pressure calculating means 30F measures the pressure during bending based on the pressure detection signal S2 from the pressure sensor 11 (FIG. 28), and based on the measured pressure Q1, the upper limit pressure = Q1 × 1. 1 is calculated (step 215 in FIG. 31).

  Further, the pressure calculating means 30F (FIG. 29) shows that when the comparison result by the comparison means 30D shows that both mold lengths are equal, that is, when the mold lengths are matched (YES in step 205 in FIG. 31). The upper limit pressure used for the first machining is calculated (step 207 or 214 in FIG. 31).

  On the other hand, the input means 30G (FIG. 29) includes the workpiece information S3 sent from the main body NC device 22 (FIG. 28), the pressure detection signal S5 sent from the pressure sensor 11, and the mold length L. The imaging signal S1 sent from the CCD camera 6 for measurement is input, and these are temporarily stored in the storage means 30J.

  Further, when mold information is input from the input means 30G, it is also stored in the storage means 30J.

  The output means 30H is composed of a liquid crystal or the like. For example, when the operator inputs mold information with the key or mouse of the input means 3E, the operator confirms by displaying data of the information. be able to.

  As described above, the storage means 30J temporarily stores the workpiece information and the like sent from the main body NC device 22 via the input means 30G, and also via the pressure sensor 11 during bending (step 209 in FIG. 31). (Step 210 in FIG. 31), and the pressure fluctuation data is used for the calculation of the upper limit pressure = Q1 × 1.1 by the pressure calculating means 30F as described above (in FIG. 31). Step 215), the upper limit pressure = Q1 × 1.1 is used for the second and subsequent machining.

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

(2)-(1) Die length judgment operation.

  In step 201 of FIG. 31, workpiece information is input, in step 202 the bending order, mold and mold layout are determined, in step 203 the mold is attached, and in step 204 the mold length L is measured. In step 205, it is determined whether or not the mold length is correct. If not (NO), an alarm or a ram stop signal S7 is issued in step 213, and the process returns to step 203 to confirm the normal length. If the mold is attached and it matches (YES), the process proceeds to step 206 in the next stage.

  That is, when the workpiece information is sent from the main body NC device 22 side (FIG. 28) to the second monitoring device 30 side, the workpiece information is stored in the storage means 30J via the input means 30G, and the bending order / gold The mold / mold layout determining means 30B reads the stored workpiece information to determine the bending order and the mold / mold layout, respectively.

  Since the determined bending order and mold / mold layout are displayed on the output means 30H, an operator who sees them attaches a predetermined mold to a predetermined position.

  During this time, the determined mold length is sent to the comparison means 30D and compared with the mold length L measured by the mold length measurement means 30C.

  When the mold is attached by the operator, the CCD camera 6 (FIG. 28) converts the optical image of the attached mold into an electrical signal, and the electrical signal S1 is transmitted from the second monitoring device 30 and the main body NC device. 22 is input.

  The electrical signal S1 from the CCD camera 6 inputted to the second monitoring device 30 is temporarily stored in the storage means 30J, and then sent to the mold length measuring means 30C, and the mold length measuring means 30C takes an image. After processing, the mold length L is measured.

  The measured mold length L is input to the comparison unit 30D, and the comparison unit 30D compares the mold length L with the already input mold length.

  As a result of the comparison, if the determined mold length is different from the measured mold length L and they do not match, the alarm means 30E is notified of this, and the alarm means 30E gives an alarm or A ram stop signal S 7 is issued, and the alarm or ram stop signal S 7 is transmitted to the main body NC device 22.

  Thereby, the main body NC device 22 stops the operation of the ram 20 via the hydraulic cylinder 5 by controlling the ram operation switching valve 12.

  Therefore, according to the present invention, when the operator is not using a regular mold, the ram 20 is stopped, so that the mold is reliably prevented from being damaged.

(2)-(2) Upper limit pressure calculation operation.

  A. Upper limit pressure used for the first machining.

  In step 206 of FIG. 31, it is determined whether or not there is mold information. If yes (YES), the upper limit pressure is calculated from the mold length × pressure resistance in step 206. If not, (NO) In step 214, the upper limit pressure is calculated by the mold length × predetermined pressure resistance, and in step 208, a command is issued to the pressure control valve 14.

  That is, when mold information is stored in the storage means 30J (FIG. 29), the mold information is sent to the pressure calculation means 30F and measured by the mold length measuring means 30C. The upper limit pressure is calculated by multiplying the mold length L by the pressure resistance as mold information.

  However, if the mold information is not stored in the storage means 30J (FIG. 29), the mold length L measured by the mold length measuring means 30C is designated by a predetermined pressure resistance (for example, specified by the manufacturer). The upper pressure is calculated by multiplying the pressure resistance.

  When the upper limit pressure used for the first machining is calculated, a calculation signal S8 is transmitted to the main body NC device 22 (FIG. 28), and the main body NC device 22 calculates the pressure with respect to the pressure control valve 14. Further, the upper limit pressure is set by transmitting a pressure setting signal S9 containing the upper limit pressure for the first machining.

  In this way, in step 209 of FIG. 31, the first bending process is performed under the set upper limit pressure, and in the meantime, in step 210, pressure fluctuation data for the second process is stored, and the step If it is determined in 211 that the first machining is not completed (NO), the process returns to step 209 and the first machining is continued.

  B. Upper limit pressure used for the second processing.

  If it is determined in step 211 in FIG. 31 that the first machining has been completed (YES), it is determined in step 212 whether or not all machining has been completed. In step 215, the upper limit pressure = Q1 × 1.1 is calculated from the actually measured pressure Q1 × 1.1. In step 208, a command is issued to the pressure control valve 14.

  That is, during the first machining (step 210 in FIG. 31), the pressure fluctuation data is detected via the pressure sensor 11 (FIG. 23) and stored in the storage means 30J, and the second machining is started. Before being performed (Step 215 in FIG. 31), the pressure calculation means 30F calculates the upper limit pressure = Q1 × 1.1 used for the second machining by the actually measured pressure Q1 (maximum value in FIG. 30) × 1.1. To do.

  When the upper limit pressure used for the second machining is calculated, a calculation signal S8 (FIG. 28) is transmitted to the main body NC device 22, and the main body NC device 22 calculates the calculated 2 for the pressure control valve 14. The upper limit pressure is set by transmitting a pressure setting signal S9 containing the upper limit pressure for the second machining.

  In this way, in step 209 of FIG. 31, the second bending process is performed under the set upper limit pressure = Q1 × 1.1, and in the meantime, in step 210, the pressure fluctuation for the third process is performed. If the data is stored and it is determined in step 211 that the second machining is not completed (NO), the process returns to step 209 and the second machining is continued.

  In the second and subsequent machining, when the same machining is repeated, it is not necessary to store pressure fluctuation data (step 210 in FIG. 26 in the second and subsequent machining) during the previous machining each time. The upper limit pressure = Q1 × 1.1 calculated based on the pressure fluctuation data stored during the machining can be continuously used for the second and subsequent machining.

  FIG. 32 (FIG. 33) is another embodiment of the second invention, which is different from the previous embodiments (for example, step 201 to step 205 in FIG. 31), is the operator using a regular mold? Are different from each other, and the CCD camera 6 (FIG. 32) captures the characteristic portions of the molds P and D from the side surface, calculates the shape and dimensions (for example, punch height, die height, etc.) of the characteristic portions by image processing, By comparing with a reference value stored in advance (step 606 in FIG. 33), the correctness of the molds P and D being used is determined.

  That is, it is generally easy to compare the shape of the side surface of the mold as to whether or not the operator is using a regular mold. For this reason, for example, as shown in FIG. The intermediate plate 60, the punch P attached to the intermediate plate 60, the die holder 61 attached to the tip of the lower table 21, and the side surface of the die D attached to the die holder 61 are taken into the imaging range S of the CCD camera 6.

  In this state, the CCD camera 6 images the side surfaces of the molds P and D including the intermediate plate 60 and the die holder 61 (step 604 in FIG. 33), and then calculates the shape and size of the characteristic part by image processing. (Step 605 in FIG. 33).

  In this case, the shape / dimensions of the characteristic portion include punch height, intermediate plate height, punch angle, punch tip for the punch P (FIG. 32), and die height, die holder height, V angle for the die D. , V widths, and when these are compared with reference values stored in advance (step 606 in FIG. 33), considering the image detection accuracy, if the calculated value falls within a certain threshold, It is assumed that the molds P and D are used (YES in step 606 in FIG. 33).

  The operation of the second embodiment of the second invention will be described below with reference to FIG.

  In step 601 of FIG. 33, workpiece information is input, in step 602, the bending order, the mold, and the mold layout are determined. In step 605, the shape / dimension of the feature portion of the mold is calculated by image processing. In step 606, it is determined whether or not the feature portion of the mold matches, and if not (NO). In step 608, an alarm or a ram stop signal is issued, and the process returns to step 603 to attach a regular mold. If it matches (YES), bending is performed in step 607.

  That is, when work information is sent from the main body NC device 22 side (FIG. 28) to the second monitoring device 30 side, the work information is stored in the storage means 30J via the input means 30G (FIG. 29). The bending order / die / die layout determining means 30B reads the stored workpiece information to determine the bending order, the die / die layout, and the D value and the L value. The shape and dimensions of the characteristic part of the mold, for example, the punch height and the intermediate plate height shown in FIG. 27 are determined, and these pieces of information are stored in the storage means 30J (FIG. 29) as a database.

  Since the determined shape / dimension of the characteristic part of the mold is displayed on the output means 30H, the worker who sees it attaches the predetermined mold to the predetermined position.

  During this time, the size and shape of the feature portion of the mold stored in the storage means 30J is sent to the comparison means 30D and calculated by image processing by the mold feature portion calculation means corresponding to the mold length measurement means 30C. It is compared with the shape and size of the characteristic part of the actual molds P and D (FIG. 32).

  When the mold is attached by the operator, the CCD camera 6 (FIG. 32) converts the optical images of the side shapes of the attached molds P and D into electrical signals, and the electrical signal S1 is (FIG. 28). , Input to the second monitoring device 30 and the main body NC device 22.

  The electrical signal S1 from the CCD camera 6 input to the second monitoring device 30 is temporarily stored in the storage means 30J and then sent to the above-described mold feature portion calculation means, and the mold feature portion calculation means outputs an image. After processing, the shape / dimension of the mold characteristic portion is calculated, and the calculated shape / dimension is input to the comparison means 30D, and the comparison means 30D and the shape / dimension as the reference value already input To be compared.

  As a result of the comparison, when the shape / dimension of the mold characteristic portion that is the reference value is different from the shape / dimension of the mold characteristic portion that is the actual measurement value, and the two do not match, the fact is notified to the alarm means 30E. The alarm or ram stop signal S7 is issued from the alarm means 30E, and the alarm or ram stop signal S7 is transmitted to the main body NC device 22.

  Thereby, the main body NC device 22 stops the operation of the ram 20 via the hydraulic cylinder 5 by controlling the ram operation switching valve 12.

  Therefore, according to another embodiment of the second invention (FIG. 32), when the operator is not using a regular mold, the ram 20 is stopped and the mold is reliably prevented from being damaged. The

  34, reference numeral 1 is a bending machine similar to that in FIG. 1, 23 is a main body NC device, and 40 is a third monitoring device.

  Among these, the bending machine 1 is provided with a CCD camera 6 constituting an image recognition device, and cooperates with worker presence position detecting means 40C constituting a third monitoring device 40 (FIG. 35) to be described later. The position where T is present is detected.

  The main body NC device 23 of the bending machine 1 having the above configuration drives the hydraulic cylinder 5 via the pressure control valve 8 and the speed control valve 7, lowers the ram 20, and moves to the workpiece W by the cooperation of the punch P and the die D. A predetermined bending process is performed, and the CCD camera 6 is driven so that the position of the worker T (the position of the mold station) can be taken into the field of view and imaged.

  Further, the main body NC device 23 outputs work information as a signal S3 to the third monitoring device 40.

  Accordingly, the third monitoring device 40 determines the mold station positions ST1, ST2, and ST3 determined based on the workpiece information based on the workpiece information and the signal S1 from the CCD camera 6 (FIG. 36B). And the presence position of the worker T detected via the CCD camera 6 are compared. If both are different and an alarm or a ram stop signal S7 is output, the main body NC device 23 to which the signal S7 is input, Stop.

  That is, the work information input through the input means 40F (FIG. 35) of the third monitoring device 40 described later includes CAD information including a three-dimensional view, a development view, and the like. The order / die / die layout determining means 40B determines the die layout.

  The determination of the mold layout is performed at the mold station positions ST1, ST2, and ST3 in which predetermined molds are installed at predetermined positions L1, L2, and L3 with respect to the machine center MC of the press brake 1 (FIG. 36A). Is a decision.

  The operator T performs processing while selecting the mold station positions ST1, ST2, and ST3 determined based on a predetermined bending order (FIG. 31B).

  In the case of bending work having as many mold station positions as possible, especially when there are many mold station positions having the same bending length, the operator T himself / herself erroneously determines the mold station positions to be machined. May end up.

  As a result, when processing a workpiece that is long in the longitudinal direction of the press brake 1 (FIG. 36A), when the operator T is mistakenly positioned at a different mold station position and is processed with a short mold. The mold is damaged, the predetermined product is not processed, and the processing must be performed again, and the processing efficiency is lowered.

  Therefore, the mold station positions ST1, ST2, and ST3 for each bending order determined by the bending order / die / die layout determining means 30B (FIG. 36B), the CCD camera 6, and an operator described later. The worker presence position (die station position) detected by the cooperation of the presence position detection means 40C is compared. If they are different, an alarm or a ram stop signal S7 is issued.

  As a result, the operator T (FIG. 34) does not lower the ram 20 even if the foot pedal is stepped on, and as described above, damage to the mold is reliably prevented, and reduction in machining efficiency such as reworking is prevented. Be blocked.

  The third monitoring device 40 constantly monitors whether or not the worker T is working at the regular position, and when the third monitoring device 40 is different from the predetermined mold station positions ST1, ST2, and ST3 (FIG. 36B). (NO in step 306 in FIG. 37), as described above, the alarm (step 309 in FIG. 37) or the ram stop signal S7 is issued to stop the lowering of the ram 20.

  The third monitoring device 40 (FIG. 35) includes a CPU 40A, bending order / die / die layout determining means 40B, worker presence position detecting means 40C, comparing means 40D, alarm means 40E, and input means. 40F, output means 40G, and storage means 40H.

  The CPU 40A comprehensively controls the entire apparatus of FIG. 25 such as the bending order / die / die layout determining means 40B and the worker presence position detecting means 40C according to the operation procedure of the third invention (FIG. 37).

  The bending order / die / die layout determining means 40B determines the bending order, the die, and the die layout based on the work information input from the main body NC device 23 (step 301 in FIG. 37) (FIG. 37). 37 step 302).

  Based on S1 transmitted from the CCD camera 6 attached to the bending machine 1 (FIG. 34), the worker presence position detection means 40C is present for each bending order (FIG. 36B). (Mold station position) is detected (step 305 in FIG. 37).

  Comparing means 30D includes mold station positions ST1, ST2, ST3 for each bending order determined by the bending order / die / die layout determining means 40B (FIG. 36B), and worker presence position detecting means. The presence positions of the workers T for each bending order detected at 40C are compared (step 306 in FIG. 37).

  The alarm means 40E issues an alarm or a ram stop signal S7 (step 309 in FIG. 37) if the result of the comparison by the comparison means 40D is that the mold station position is different from the existing position (NO in step 306 in FIG. 37). , It is sent to the main body NC unit 23.

  On the other hand, the input means 40F (FIG. 35) is the work information S3 sent from the main body NC device 23 (FIG. 34), and the signal sent from the CCD camera 6 to detect the location of the worker T. S1 is input and these are temporarily stored in the storage means 40H.

  The output means 40G is composed of liquid crystal or the like. For example, when the bending station / die / die layout determining means 40B determines the die station positions ST1, ST2 and ST3 for each bending order (FIG. 36B). By displaying it, the operator can confirm it.

  As described above, the storage unit 40H temporarily stores the work information and the like sent from the main body NC device 23 via the input unit 40F, and the bending order determined by the bending order / die / die layout determining unit 40B. Each (FIG. 36 (B)) mold station ST1, ST2, ST3 position is memorize | stored as a database.

  As a result, the stored mold station positions ST1, ST2, and ST3 (FIG. 36B) determine whether the operator's presence position detected by the worker presence position detection means 40C is correct or not. (Step 306 in FIG. 37).

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

(3)-(1) Operation until the mold is installed.

  In step 301 of FIG. 37, workpiece information is input. In step 302, the bending order, the mold, and the mold layout are determined. In step 303, the mold is attached.

  That is, when work information is sent from the main body NC device 23 side (FIG. 34) to the third monitoring device 40 side, the work information is stored in the storage means 40H via the input means 40F (FIG. 35), The bending order / die / die layout determining means 40B reads the stored workpiece information to determine the bending order, the die, and the die layout.

  The determined bending order, mold, and mold layout are displayed on the output means 40G as the mold station positions ST1, ST2, and ST3 for each bending order (FIG. 36B). Attaches a predetermined mold to a predetermined mold station position.

  During this time, the mold station positions ST1, ST2, and ST3 for each bending order (FIG. 36B) are stored as a database in the storage means 40H, and are used by the comparison means 40D to determine whether or not the operator T is present. (Step 306 in FIG. 37).

(3)-(2) An operator's presence / absence judgment operation.

  In step 304 of FIG. 37, machining is started. In step 305, the presence position of the worker T is detected. In step 306, it is determined whether or not the presence position of the worker T is a regular position. If not (NO), an alarm or ram stop signal S7 is issued in step 309, and if it is a normal position (YES), the process proceeds to the next step 307.

  That is, when the mold is attached by the worker, the processing is started, the CCD camera 6 (FIG. 34) converts the optical image of the position where the worker T is working into an electrical signal, and the electrical signal S <b> 1 is input to the third monitoring device 40 and the main body NC device 23.

  The electrical signal S1 from the CCD camera 6 input to the third monitoring device 40 is temporarily stored in the storage means 40G via the input means 40F, and then sent to the worker presence position detection means 40C for the presence of the worker. Image processing is performed by the position detection means 40C, and the presence position of the worker T is detected for each bending order.

  The detected position of the worker T is input to the comparison means 40D, and the comparison means 40D stores the mold station position ST1 for each bending order (FIG. 36 (B)) stored in the storage means 40H. Compared with ST2 and ST3.

  As a result of the comparison, when the presence position of the worker T for each bending order is different from the mold station positions ST1, ST2, and ST3 for each bending order stored in the storage unit 40H (FIG. 36B), That is, when the position is not the proper position, the alarm means 40E is notified of this, and an alarm or ram stop signal S7 is issued from the alarm means 40E, and the alarm or ram stop signal S7 is transmitted to the main body NC device 23. Is done.

  Thus, the main body NC device 23 stops the operation of the ram 20 via the hydraulic cylinder 5 by controlling the pressure control valve 8 and the speed control valve 7.

  Therefore, according to the present invention, when the worker is not working at the regular position, the ram 20 stops, so that even if the worker steps on the foot pedal, the ram 20 does not descend. In addition, it is possible to reliably prevent the mold from being damaged and to prevent a reduction in processing efficiency such as redoing the processing.

  Thereafter, the worker T moves to a normal position, and machining is started again (step 304 in FIG. 37).

  If it is determined in step 306 in FIG. 37 that the position where the worker T is present is a normal position (YES), the processing is continued in step 307 and the processing is completed in step 308. If it is determined that the process is not completed (NO), the process returns to step 305 to repeat the same operation. If the process is completed (YES), all the operations are completed (END).

1 is an overall view showing an embodiment of the first invention. It is detail drawing of the 1st monitoring apparatus 3 which comprises 1st invention. It is operation | movement explanatory drawing of the pattern A of 1st invention. It is operation | movement explanatory drawing of the pattern B of 1st invention. It is operation | movement explanatory drawing of the pattern C of 1st invention. It is a figure which shows the position detection area of the finger F of the hand by 1st invention. It is a figure which shows the database which consists of worker information and ram control signal S4 by 1st invention. It is a flowchart explaining operation | movement of 1st invention. It is a figure which shows other embodiment of 1st invention. The tip coordinates X of the finger F of the hand in Fig. 9 is a diagram showing a relationship between the descending speed V _R of the ram 20. It is operation | movement explanatory drawing of FIG. It is a figure which shows the example of application of 1st invention. It is 1st operation | movement explanatory drawing of FIG. It is 2nd operation | movement explanatory drawing of FIG. It is 3rd operation | movement explanatory drawing of FIG. It is a flowchart explaining the operation | movement of FIG. It is a figure which shows the other application example of 1st invention. It is a figure which shows the example of the bending process in FIG. FIG. 18 is a first operation explanatory diagram of FIG. 17. It is 2nd operation | movement explanatory drawing of FIG. FIG. 18 is a third operation explanatory diagram of FIG. 17. It is a flowchart explaining the operation | movement of FIG. It is a figure which shows the example of application to the sheet metal processing system of 1st invention. It is a figure which shows the structure of the 1st monitoring apparatus 3 in FIG. It is a figure which shows the database used for FIG. It is a figure which shows the example of a process in FIG. It is a flowchart explaining the operation | movement of FIG. It is a general view which shows embodiment of 2nd invention. It is detail drawing of the 2nd monitoring apparatus 30 which comprises 2nd invention. It is a figure which shows the upper limit pressure by 2nd invention. It is a flowchart explaining operation | movement of 2nd invention. It is a figure which shows other embodiment of 2nd invention. 33 is a flowchart for explaining the operation of FIG. 32. It is a general view which shows embodiment of 3rd invention. It is detail drawing of the 3rd monitoring apparatus 40 which comprises 3rd invention. It is explanatory drawing of metal mold station position ST1, ST2, ST3 by 3rd invention. It is a flowchart explaining operation | movement of 3rd invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Bending machine 2, 22, 23 Main body NC apparatus 3 1st monitoring apparatus 3A CPU
3B Ram motion detection means 3C Body motion detection means 3D Ram / body interference prediction means 3E Input means 3F Output means 3G Storage means 4 Linear encoder 5 Hydraulic cylinder 6 CCD camera 7 Speed control valve 8, 14 Pressure control valve 9 Hydraulic pump 10, 13, 15 Oil tank 11 Pressure sensor 12 Ram operation switching valve 20 Upper table 21 Lower table 30 Second monitoring device 30A CPU
30B Bending order / die / die layout determining means 30C die length measuring means 30D comparing means 30E alarm means 30F pressure calculating means 30G input means 30H output means 30J storage means 40 third monitoring device 40A CPU
40B Bending order / die / die layout determination means 40C worker presence position detection means 40D comparison means 40E alarm means 40F input means 40G output means 40H storage means D die P punch ST1, ST2, ST3 mold station position W work a Danger point b Machine stop point c Safety distance

Claims (1)

A bending machine provided with a die composed of a punch (P) and a die (D) for bending a workpiece (W), from input means (30G) for inputting workpiece information and from the input means (30G) Bending order / die / die layout determining means (30B) for determining the bending order, die and die layout based on the workpiece information, and the die for measuring the length of the die attached to the bending machine A CCD camera (6) for imaging the entire mold in the field of view, and a mold length measuring means for measuring the mold length (L) based on the imaging signal (S1) transmitted from the CCD camera (6) (30C) is compared with the mold length determined by the bending order / mold / mold layout determining means (30B) and the mold length measured by the mold length measuring means (30C). Comparing means (30D) and the comparing means (3 As a result of the comparison by D), the alarm means (30E) which issues an alarm or a ram stop signal when the lengths of the two dies are different from each other, and the length of both dies is equal as a result of the comparison by the comparison means (30D). In this case, the pressure calculating means (30F) for calculating the upper limit pressure for the second machining based on the actually measured pressure during the first bending, and the pressure calculating means (30F) for the upper limit pressure for the second machining. And a main body NC device (22) for controlling the upper limit pressure calculated by (1) .

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