JP4565633B2 - Bending machine - Google Patents

Description

  The present invention enables the operator to confirm the distance between the blades between the punch and the die, thereby accurately informing the operator of the degree of danger and adjusting the ram speed to the degree of danger. The present invention relates to a bending apparatus that removes anxiety and ensures safety.

  Conventional bending apparatuses are disclosed in, for example, Japanese Patent Publication No. 62-34446 and Japanese Utility Model Publication No. 59-16738.

  Among them, the bending apparatus disclosed in Japanese Examined Patent Publication No. 62-34446 has a projector and a light receiver disposed in front, and is dangerous to the operator after 6 mm above the pinching point (position where the punch contacts the workpiece). Therefore, processing is continued without stopping the ram even if the light beam is blocked.

In addition, a bending apparatus disclosed in Japanese Patent Publication No. 62-34446 is provided with a projector and a light receiver at both ends of a ram, and a beam is transmitted between the punch and the die and from the punch tip to the ram maximum inertia lowering value (ram). After the stop signal is generated, the ram is positioned below the maximum value when the ram descends due to inertia without stopping immediately.
Japanese Patent Publication No.62-34446 Japanese Utility Model Publication No.59-16738

  However, all of the above conventional bending devices use an optical safety device, but in order to shorten the processing time, the ram does not return to the top dead center even after a predetermined stroke has elapsed. It returns only to the extent that the distance between the blades (the distance between the punch and the die) that can insert the workpiece (including the flange) is obtained.

  For this reason, in the case of a workpiece that is short in the front-rear direction, the operator's hand and the punch may come into contact with each other when the workpiece is inserted between the punch and the die having a short blade distance. Or when the said workpiece | work is already processed, it becomes difficult to insert a workpiece | work between a punch and die | dye with a short blade distance, and workability | operativity falls remarkably.

  Further, since the distance between the blades is short, the operator cannot clearly confirm the processing situation such as where the tip position of the punch is visually.

  As a result, the bending apparatus using the conventional optical safety device cannot completely wipe out the dangerous state for the worker, which gives the worker anxiety.

  The same applies to a bending apparatus that does not use an optical safety device. As described above, when the distance between the blades is short, the operator's hand and the punch come into contact with each other when the workpiece is inserted. The worker's danger state cannot be completely wiped out, which gives anxiety.

  The object of the present invention is to enable the operator to confirm the distance between the blades between the punch and the die, thereby accurately informing the operator of the degree of danger, and by adjusting the ram speed to the degree of danger. To provide a bending machine that eliminates the operator's anxiety and ensures safety.

In order to solve the above problems, the present invention provides:
As described in claim 1, the inter-blade distance transmitting means 13 and 14 for transmitting the degree of the inter-blade distance L between the punch P and the die D to the operator S based on the ram position in the vicinity of the machining position. The inter-blade distance transmission means 13 and 14 are configured by a light-emitting means 13 that outputs light or a sound-producing means 14 that outputs sound, and based on a preset degree of the distance between the blades, A bending device characterized in that it outputs light whose color has changed, and the sounding means 14 outputs sound whose interval has changed ;
As described in claim 2 , the degree of the inter-blade distance L based on the ram position is set in advance, and in the actual bending process, based on the pre-set inter-blade distance L, the vicinity of the machining position Control means for controlling the distance between the blades 13 and 14 provided in the control unit, and a control means for controlling the speed of the ram 4. The control means has a first mode, a second mode, and a third mode. The first mode is a means that does not use the optical safety device 1, the second mode and the third mode are means that use the optical safety device 1, and in each mode, the inter-blade distance transmission means 13, 14 are used. It has a transmission medium control means 20E for changing the contents of the output transmission medium and a ram control means 20J for changing the speed of the ram, and can be switched to each mode via a changeover switch means 20D.
In the second mode and the third mode, the optical safety device 1 is configured to control the optical safety device 1 which is composed of the light projector 2 and the light receiver 3 at both ends of the ram 4 and the optical axis K is disposed below the tip of the punch P. Device control means 20H,
The second mode, when the ram 4 driven bending test, a storage unit 20C which stores a blocking position Z ₁ is the position of the ram 4 when positioned the workpiece W is light shielding,
The third mode, based on the work positioning posture state diagram alpha, an arithmetic unit 20G which positioned the workpiece W is computed the blocking position Z ₁ is the position of the ram 4 when the light is blocked,
In the second mode or the third mode, when the actual bending, if it is blocked by stored or computed blocking position Z ₁ other than the position Z _C, the occurrence of abnormality is transmitted to the operator As described above, the transmission medium control means 20E changes the contents of the transmission medium output by the inter-blade distance transmission means 13 and 14, and the ram control means 20J changes the speed of the ram 4. The technical means of the device is taken.

  According to the configuration of the present invention, for example, the inter-blade distance transmitting means 13 is provided on the front surface of the upper table 4 (FIG. 1), and the inter-blade distance transmitting means 13 is composed of, for example, a light emitting diode as an example of a light emitting means. If the distances A, B, and C of the blade distance L based on the ram position are set in advance (for example, the first mode in FIG. 2 (means not using the optical safety device 1)), the actual bending process is performed. In some cases (FIG. 3), the color of the light output from the light emitting diode 13 and the speed of the ram 4 are set to blue and 100 mm / sec (FIG. 3 (A)) according to the preset distance L between the blades. ), Yellow and 50 mm / sec (FIG. 3B), and red and 10 mm / sec (FIG. 3C), the operator gradually increases the distance L between the blades as the ram 4 descends. It can be recognized that it is narrowing, the degree of danger is understood, and By combining the ram speed to the degree of danger, the operator can more anxiety without work.

  As described above, according to the present invention, by enabling the operator to check the distance between the blades between the punch and the die, the worker is informed of the degree of danger and the ram speed is set to the degree of danger. By combining them, there is an effect of removing the anxiety of the worker and providing a bending apparatus that ensures safety.

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

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

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

  That is, the bending apparatus of FIG. 2 is a descending press brake, and after the worker S abuts and positions the work W against the back gauge abutments 10 and 11 disposed behind the lower table 5, When the foot pedal 12 is turned on to operate the hydraulic cylinders 6 and 7 and lower the upper table 4 as a ram, the workpiece W is bent by the cooperation of the punch P and the die D.

  Further, a ram position detecting means 15 (for example, a linear scale) for detecting the position of the ram 4 is provided in the vicinity of the ram 4 (for example, the side plate 9).

For example, in the case of the second mode described later (FIG. 2), the ram position detecting means 15 is used when the positioned workpiece W is shielded from light during trial bending (steps 102 to 105 in FIGS. 4 and 7). The position of the ram 4 (light shielding position Z ₁ ((B) in FIG. 4 (1))) is detected and stored (step 104 in FIG. 7).

  Further, the ram position detecting means 15 (FIG. 1) detects the actual position of the ram 4 during the subsequent actual bending process (steps 106 to 115 in FIGS. 5 and 7). Depending on the degree of the inter-blade distance L corresponding to the ram position (FIG. 2), the light output from, for example, a light-emitting diode, which is the inter-blade distance transmitting means, is transmitted via the transmission medium control means 20E (FIG. 1) described later. While changing the color, the speed of the ram 4 is changed via the ram control means 20J (FIG. 1) (steps 107, 110 and 113 in FIG. 7).

  At both ends of the ram 4 (FIG. 1), as shown in the figure, an optical safety device 1 composed of a projector 2 and a light receiver 3 is installed, and the optical axis K is disposed below the tip of the punch P. Yes.

  Further, an inter-blade distance transmission means 13 is provided on the front surface of the upper table 4, and the inter-blade distance transmission means 13 is connected to the punch P based on the position of the ram 4 detected by the ram position detection means 15. The degree of the distance L between the dies D is transmitted to the operator S.

  This inter-blade distance transmission means 13 outputs a predetermined transmission medium, and outputs a transmission medium whose contents have been changed based on a preset degree of inter-blade distance L.

  For example, the inter-blade distance transmission means 13 may be constituted by a light emitting means (for example, a light emitting diode) that outputs light as a transmission medium.

  In this case, the content of the transmission medium that can be easily recognized by the operator includes the color of light. Therefore, the light-emitting diode 13 has a predetermined distance L between the blades when it is actually bent. Based on (FIG. 2), the degree of the inter-blade distance L is transmitted to the operator S by outputting light whose color has changed.

  For example, in the case of the first mode described later (FIGS. 2 and 3), the color of light output from the light emitting diode 13 by the operator S (FIG. 1) operating the keyboard of the operation panel 20B in advance. The degree of the inter-blade distance L (A to C) and the ram speed are set in accordance with the ram position when changing.

  Then, if the degree of the set inter-blade distance L and the ram speed are stored as a data table in the storage means 20C (FIG. 1), the light emission control means 20E1 is allowed to move to the ram position during actual bending. While inputting the ram position signal from the detecting means 15 and referring to the data table (FIG. 2), the light emitting diode 13 (FIG. 1) is selected according to the degree of the distance L between the blades corresponding to the corresponding ram position. The color of the output light is changed (for example, blue (first mode in FIG. 2), yellow, red).

  Further, for example, the inter-blade distance transmission means 14 (FIG. 1) may be constituted by sound generation means (for example, a speaker) that outputs a sound as a transmission medium.

  In this case, the content of the transmission medium that can be easily recognized by the operator includes a sound interval. Therefore, the speaker 14 has a predetermined distance L between the blades when it is actually bent ( Based on FIG. 2, the degree of the distance L between the blades is transmitted to the operator S by outputting a sound whose interval has changed.

  For example, in the case of the first mode (FIGS. 2 and 3), similarly, the interval between sounds output by the speaker 14 when the operator S (FIG. 1) operates the keyboard of the operation panel 20B in advance. The degree of the inter-blade distance L (A to C) and the ram speed are set in accordance with the ram position when changing.

  Similarly, if the degree of the set inter-blade distance L is stored as a data table in the storage means 20C (FIG. 1), the sound generation control means 20E2 is allowed to move to the ram position during actual bending. While inputting the ram position signal from the detecting means 15 and referring to the data table (FIG. 2), the speaker 14 outputs (FIG. 1) according to the degree of the interblade distance L corresponding to the corresponding ram position. (E.g., beep (continuous sound) (first mode in FIG. 2), beeping (intermediate intermittent sound), beeping intermittent sound) (shortest intermittent sound)).

  Further, the inter-blade distance transmission means 13 and 14 may be installed anywhere near the machining position (where the operator S can recognize the change in the content of the transmission medium). In addition to the front surface of the upper table 4 There are a box of the foot pedal 12, a two-hand operation panel, an operation pendant, and the like.

By providing such inter-blade distance transmission means 13 and 14 near the machining position, according to the present invention, the operator can confirm the inter-blade distance between the punch and the die.
In addition, according to the present invention, by changing the contents of the transmission medium output by the inter-blade distance transmission means 13 and 14, the operator can confirm the inter-blade distance and inform the degree of danger. As described above, according to the degree of the distance between the blades (FIG. 2), the speed of the ram 4 is changed (FIG. 2) via the ram control means 20J (FIG. 1), and the ram speed is adjusted to the degree of danger. This eliminates the operator's anxiety and ensures safety.

  As a control means of the bending apparatus having the above configuration, there is an NC apparatus 20, which includes a CPU 20A, an input / output means 20B, a storage means 20C, a changeover switch means 20D, and a transmission medium control means 20E. , Workpiece positioning posture state diagram creating means 20F, computing means 20G, optical safety device control means 20H, and ram control means 20J.

  The CPU 20A controls the entire apparatus shown in FIG. 1, such as the transmission medium control means 20E, the optical safety device control means 20H, and the ram control means 20J, according to an operation procedure for implementing the present invention (for example, FIG. 7).

  The input / output means 20B is, for example, an operation panel movably provided on the upper table 4, and includes input means such as a keyboard and output means such as a screen. For example, in the case of the first mode (FIG. 2), The operator S (FIG. 1) uses the input / output means 20B to change the contents (light color and sound interval) (FIG. 2) of the transmission medium output by the inter-blade distance transmission means 13, 14 described above. The degree of the inter-blade distance L based on the ram position is set in the case where the ram 4 is changed and the speed of the ram 4 which will be described later is changed (right column in FIG. 2).

The storage means 24C (FIG. 1), for example, in the second mode using the optical safety device 1 (FIG. 2), lowers the ram 4 at the time of trial bending (FIG. 4) (for example, as shown in FIG. 4 (1)). (A)) The position Z ₁ (light shielding position) of the ram 4 when the positioned workpiece W is shielded from light (FIG. 4 (1) (B)) is stored.

On the basis of the stored shading position Z _1, for example using a worker S (Fig. 1) is the input and output unit 20B, setting the extent of the blade between the distance L in the second mode (Fig. 2) .

  As described above, the degree of the inter-blade distance L is stored in the storage unit 20C as a data table, and similarly in the actual bending process (FIG. 5), for example, the light emission control unit 20E1 (FIG. 5). 1) and the ram control means 20J input the ram position signal from the ram position detecting means 15, and referring to the data table (FIG. 2), according to the degree of the distance L between the blades corresponding to the corresponding ram position. Thus, the light color of the light emitting diode 13 is changed and the speed of the ram 4 is changed.

  The changeover switch means 20D is a switch for switching between the first mode (FIG. 2) and the second mode (FIG. 6) or the third mode (FIG. 6) described later.

  The transmission medium control means 20E (FIG. 1) constitutes each mode (FIG. 2), and controls the above-mentioned inter-blade distance transmission means 13, 14 in accordance with the preset degree of inter-blade distance L. The content of the transmission medium output by the inter-distance transmission means 13 and 14 is changed.

  This transmission medium control means 20E changes the content of the transmission medium output by the inter-blade distance transmission means 13, 14 in general to transmit the degree of the inter-blade distance L based on the ram position to the operator S. It is to do.

However, for example, in the second mode in which the optical safety device 1 is used (FIGS. 2, 4, 5, and 7), the optical safety device 1 has the light shielding position Z ₁ (positioned workpiece W described above). In some cases, light shielding at a position Z _C other than the position Z ₁ of the ram 4 when the light is shielded is detected (YES in steps 108 and 111 in FIG. 7).

  In this case, the transmission medium control means 20E (FIG. 1) is abnormal with respect to the operator S because it is regarded as light shielding by other than the workpiece W (such as the limbs of the operator) (in parentheses in FIG. 5 (1)). In order to transmit the occurrence of the situation, the content of the transmission medium of the inter-blade distance transmission means 13, 14 is changed (step 114 in FIG. 7).

  As described above, the transmission medium control means 20E is constituted by, for example, the light emission control means 20E1 or the sound generation control means 20E2, and inputs the ram position signal from the ram position detection means 15 during actual bending. Referring to the data table (FIG. 2), the contents of the transmission medium output by the inter-blade distance transmission means 13 and 14 according to the degree of the inter-blade distance L corresponding to the corresponding ram position (light color and sound) ).

  The workpiece positioning posture state diagram creating means 20F (FIG. 1) determines the bending order, the die, and the die layout based on the product information J (CAD information) in the third mode using the optical safety device 1. Thereafter, a workpiece positioning posture state diagram α (FIG. 6) is created for each bending process.

The calculation means 20G (FIG. 1) shields the positioned workpiece W from light based on the workpiece positioning posture state diagram α (FIG. 6) created by the workpiece positioning posture state diagram creation means 20F in the third mode. The position Z ₁ (light shielding position) of the ram 4 is calculated.

Further, the computing means 20G changes the light output from the light emitting diode 13 and changes the ram speed based on the light shielding position Z ₁ to change the ram speed Z ₁ ′ (= light shielding). (Position Z ₁ +10 mm) (for example, equivalent to (B) in FIG. 5A, blue → yellow and 100 mm / sec → 50 mm / sec) is calculated.

Further, the calculation means 20G is arranged to detect the position Z ₁ ′ of the ram 4 (color change position (shift position) Z ₁ ′ (corresponding to (B) in FIG. 5 (1))) or the top dead center Z ₀ ( 5) (corresponding to (A) in FIG. 5) and the final stroke position Z ₂ of the ram 4 (corresponding to (C) in FIG. 5 (1)), the degree of the distance between the blades is calculated (FIG. 2). The degree of distance between the blades in the second mode is equivalent to AC).

  The optical safety device control means 20H (FIG. 1) drives the projector 2 constituting the optical safety device 1 described above (for example, activates a laser oscillator), and projects light to the light receiver 3 side, thereby The optical safety device 1 is controlled.

For example, in the trial bending in the second mode (FIG. 7), the optical safety device control means 20H detects that the positioned workpiece W is shielded from light (YES in step 103 in FIG. 7). A signal is transmitted to the storage means 20C, and at that time, the position Z ₁ (light shielding position) of the ram 4 detected by the ram position detection means 15 is stored in the storage means 20C (step 104 in FIG. 7).

  For example, in actual bending, the ram control means 20J operates the hydraulic cylinders 6 and 7 to move the ram 4 up and down when the operator S turns on the foot pedal 12.

  In this case, the ram control means 20J configures each mode (FIG. 2), controls the ram 4 in accordance with the degree of the inter-blade distance L based on a preset ram position, and changes the speed of the ram 4. .

  The ram control means 20J changes the speed of the ram 4 in general because the ram speed is adjusted to the degree of danger corresponding to the degree of the distance L between the blades (FIG. 2). In order to ensure safety, the worker can work with peace of mind.

However, the ram control means 20J has the light shielding stored at the time of the trial bending in the previous stage in the actual bending process in the second mode using the optical safety device 1 (steps 106 to 115 in FIGS. 5 and 7). in the position Z ₁ (position Z ₁ of the ram 4 when positioned the workpiece W is light shielding (e.g., Fig. 4 (1) (B))) positions other than Z _C (in parentheses in FIG. 5 (1)) When the light is shielded (eg, YES in step 108 in FIG. 7), it is assumed that the light is shielded by something other than the workpiece W, and the operation of the hydraulic cylinders 6 and 7 (FIG. 1) is stopped and the ram 4 is emergency stopped ( Step 115 in FIG. 7) ensures the safety of the operator.

  In other words, in this case, the ram control means 20J (see FIG. 1) is considered to be shielded from light other than the work W, and the occurrence of an abnormal situation is transmitted to the worker S in the same manner as the transmission medium control means 20E. In order to do this, the ram speed is changed (step 115 in FIG. 7).

  In the present invention, the control means comprising the NC device 20 described above is used. In the present invention, the degree of the inter-blade distance L based on the ram position is set in advance, and the actual bending is performed based on the set inter-blade distance L. In addition, the inter-blade distance transmission means 13 and 14 and the ram 4 are controlled. In this case, the control means includes a first mode (FIG. 2), a second mode, and a third mode.

  Among these, the first mode is a means that does not use the optical safety device 1, and the second mode and the third mode are means that use the optical safety device 1.

In the first mode, as shown in FIG. 3, the distance L between the blades is L ₀ from the top dead center Y ₀ (or ram return point) to the predetermined position Y ₁ (FIG. 3A). > L ≧ L ₁ is set (for example, area A), and in actual bending, the light emitting diode 13 emits blue light in this area A (safe area), and the ram speed is 100 mm / sec ( (High speed).

In this case, when the ram 4 is at the predetermined position Y ₁ , the tip of the punch P is at a position of, for example, 30 mm from the upper surface of the positioned workpiece W.

In addition, when the ram 4 (FIG. 3 (B)) from the predetermined position Y ₁ to Y ₂ , the degree of the distance L between the blades is set as L ₁ > L ≧ L ₂ (for example, B region), and the actual bending At the time of processing, in this B area (caution area), the light emitting diode 13 emits yellow light, and the ram speed is controlled to be 50 mm / sec (medium speed).

In this case, when the ram 4 is in position Y _2, the tip of the punch P is, from the upper surface of the positioned workpiece W, for example, in 10mm position.

Further, when the ram 4 (FIG. 3 (B)) is set to a predetermined position Y ₂ to Y ₃ , the degree of the distance L between the blades is set as L ₂ > L (for example, C region), and the actual bending is performed. In the C region (dangerous region), the light emitting diode 13 emits red light, and the ram speed is controlled to be 10 mm / sec (low closing speed).

In this case, when the ram 4 is at the predetermined position Y ₃ , the tip of the punch P bites into the workpiece W bent to a desired angle and stops, and is the final stroke position.

  As described above, the setting of the degree of the inter-blade distance L based on the ram position in the first mode in which the optical safety device 1 is not used is performed by, for example, the operator S using the changeover switch means 20D (FIG. 1). After switching to the first mode, the setting is made using the input / output means 20B, and the result is stored in the storage means 20C as a data table (FIG. 2).

  Thus, during actual bending, the light emission control means 20E10 (FIG. 1) and the ram control means 20J input the ram position signal from the ram position detection means 15 and refer to the data table (FIG. 2). Then, based on the degree of the interblade distance L based on a preset ram position, the light emitting diode 13 is controlled to exhibit a predetermined light color, and the ram 4 is controlled to exhibit a predetermined ram speed. To do.

  Therefore, according to the present invention, the operator can check the distance between the punch and the die, and in particular, in the C region (FIGS. 2 and 3C), the light emitting diode 13 emits red light. Therefore, the operator knows the degree of danger accurately, and the ram speed in accordance with the degree of danger is reduced to 10 mm / sec (low closing speed), so that the processing is performed with a higher risk, Safety is ensured.

  The second mode is performed when mold information (punch height, punch type (gooseneck type or direct sword type, etc.), die height, die V width, etc.) is not input or there is no mold information.

  As described above, the second mode uses the optical safety device 1 (FIG. 1) and is configured by trial bending (FIG. 4) and actual bending (FIG. 5) (FIG. 7). .

(1) Trial bending.
In the trial bending, the optical safety device 1 is operated (step 101 in FIG. 7), the ram 4 is lowered at a low speed (step 102 in FIG. 7) for each bending process, and the positioned workpiece W is moved. When the light is shielded (YES in step 103 in FIG. 7), the position Z ₁ (light shielding position Z ₁ ) of the ram 4 at the time of light shielding is stored (step 104 in FIG. 7), and the final stroke position Z ₂ is further determined. This is stored (step 105 in FIG. 7).

  That is, when the operator S (FIG. 1) switches the NC device 20 to the second mode via the above-described changeover switch means 20D (FIG. 1), the CPU 20A that detects this switches the optical safety device control means. The optical safety device 1 is activated via 20H.

  In this state, in the first step (FIG. 4 (1)), for example, when the ram 4 is lowered at a low speed using a hand pulser (approximately 10 mm / sec) ((A) in FIG. 4 (1)), The optical axis K disposed below (FIG. 4 (1) (B)) is shielded by the positioned workpiece W.

The CPU 20A that has detected that via the optical safety device control means 20H (FIG. 1) controls the ram position detection means 15 to determine the position Z ₁ (light shielding position Z ₁ ) of the ram 4 at that time. And stored in the storage means 20C.

Further, the ram 4 ((C) in FIG. 4 (1)) is lowered at a low speed, and the final stroke position Z ₂ detected via the ram position detecting means 15 (FIG. 1) is determined ((C) in FIG. 4 (1)). )), And stored in the storage means 20C (FIG. 1).

In this case, when the light shielding position Z ₁ ((B) in FIG. 4 (1)) is stored, the ram 4 may be temporarily stopped and lowered at a low speed again.

Next, in the second step (FIG. 4 (2)), the work W having the flange F formed in the first step is positioned, and the same operation as the first step (FIG. 4 (1)) is performed. The light shielding position Z ₁ ((B) in FIG. 4 (2)) and the final stroke position Z ₂ ((C) in FIG. 4 (2)) are stored in the storage means 20C (FIG. 1).

  In this way, after performing trial bending for each bending step, in actual bending (FIGS. 5 (1) and (2)), when transmitting the degree of the distance between the blades to the operator, For example, when the light emitting diode 13 is blue and the ram speed is 100 mm / sec (high speed), the distance between the blades is large and is the A area (safe area), and similarly yellow is 50 mm / sec (medium speed). In this case, the distance between the blades is medium and is in the B region (attention region), and when the light-emitting diode 13 is turned off and the ram 4 is stopped, it is in the C region (end of processing). It is assumed that the worker is made to recognize (FIGS. 5A to 5C).

In this case, the position Z ₁ ′ of the ram 4 when the light emitting diode 13 changes from blue to yellow and the ram speed changes from 100 mm / sec (high speed) to 50 mm / sec (medium speed) (FIG. 5 (1)). (B)), for example, a position 10 mm above the stored light shielding position Z ₁ ((B) in FIG. 4 (1)).

That is, the predetermined position Z ₁ ′ of the ram 4 when the light emitting diode 13 changes from blue to yellow and the ram speed changes from 100 mm / sec (high speed) to 50 mm / sec (medium speed) (step of FIG. 7). 109), the light shielding position Z ₁ +10 mm is set.

The predetermined position Z ₁ ′ (color change position (shift position)) of the ram 4 ((B) of FIG. 5 (1)), top dead center Z ₀ (or ram return point) and (FIG. 5 ( 1) (A)) and the final stroke position Z ₂ (FIG. 5 (C) in FIG. 5), the degree of the distance between the blades and the degree of the distance between the blades are transmitted to the operator. As described above, the correspondence between the color of light to be exhibited by the light emitting diode 13 and the speed to be exhibited by the ram 4 is stored in the storage means 20C (FIG. 1) as a data table for each bending process (FIG. 2). Second mode).

As described above, when light is shielded at a position Z _C other than the light shielding position Z ₁ (in parentheses in FIG. 5 (1)) during actual bending, the light emitting diode 13 and the ram 4 are , It is necessary to notify the operator that the abnormal situation has occurred, not the degree of the distance between the blades (for example, YES in step 108 in FIG. 7 → steps 114 and 115).

Therefore, the position Z _C (emergency stop position) of the ram 4 in that case, the color of the light presented by the light emitting diode 13 (for example, red representing an abnormal situation) and the speed exhibited by the ram 4 (for example, a stop representing an abnormal situation or 10 mm / The correspondence with sec (low closing speed) is also made into a data table for each bending process (second mode in FIG. 2).

(2) Actual bending process.
When the setting operation by the trial bending is finished, actual bending is performed (step 106 to step 115 in FIG. 7).

In this actual bending process, with the optical safety device 1 (FIG. 1) being operated, the ram 4 is lowered at a high speed (100 mm / sec) for each bending process (step 106 in FIG. 7), and the light-emitting diode 13 Is emitted in blue (step 107), and if the light is not shielded at a position Z _C other than the stored light shielding position Z ₁ (NO at step 108), the ram 4 is at a predetermined position Z ₁ ′ (color changing position (shift position)). Is reached (step 109). If the predetermined position Z ₁ ′ (color change position (shift position)) has been reached (YES in step 109), the light emitting diode 13 emits yellow light, and the ram 4 is lowered by 50 mm / sec (medium speed) (step 110), if not blocked by the stored shading position Z ₁ other positions Z _C (NO in step 111), the ram 4 the final stroke position Determining whether reaching the Z ₂ (step 112), if reached the final stroke position Z ₂ (YES in step 112), with turns off the light emitting diode 13 to stop the ram 4 (step 113) .

That is, in the first step (FIG. 5 (1)), for example, when the operator S turns the foot pedal 12 on (FIG. 1) and lowers the ram 4 at high speed ((A) of FIG. 5 (1)). The CPU 20A that has detected it (FIG. 1) controls the ram position detection means 15, the light emission control means 20E1, and the ram control means 20J, so that the ram 4 moves from the top dead center Z ₀ to the predetermined position Z ₁ ′ (color change position). Until (shifting position)) (second mode in FIG. 2), the light emitting diode 13 exhibits blue and the ram 4 exhibits 100 mm / sec (high speed).

Next, when the ram 4 reaches the predetermined position Z ₁ ′ (color changing position (shift position)) ((B) in FIG. 5 (1)), the CPU 20A that detects it (FIG. 1), the light emission control means 20E1 and the ram 4 By controlling the control means 20J, the light output from the light emitting diode 13 ((B) in FIG. 5 (1)) is changed from blue to yellow, and the ram speed is changed from 100 mm / sec (high speed) to 50 mm / sec ( Change to medium speed.

Then, until the ram 4 reaches the last stroke position Z _2, the light emitting diode 13 continues to output the light of the yellow (second mode of FIG. 2), also ram 4, the 50 mm / sec (medium When the ram 4 reaches the final stroke position Z ₂ ((C) of FIG. 5 (1)), the CPU 20A that detects it (FIG. 1), the light emission control means 20E1 and the ram control means 20J. Is controlled to turn off the light emitting diode 13 and stop the ram 4.

  In this way, the present invention transmits the degree of the distance between the blades based on the ram position to the operator by changing the color of the light output from the light emitting diode 13, and the degree of the distance between the blades. The operator can work with peace of mind by adjusting the ram speed to the degree of danger according to the situation.

However, if the light is shielded at a position Z _C other than the stored light shielding position Z ₁ in step 108 or 111 of FIG. 7 (YES), the CPU 20A that detects it (FIG. 1), except for the workpiece W For example, it is considered as shading by the operator's limbs (in parentheses in FIG. 5 (1)).

  As a result, the CPU 20A (FIG. 1) controls the light emission control means 20E1 to transmit the occurrence of the abnormal situation to the worker S, and the blue or yellow light that has been output by the light emitting diode 13 is changed to red. The light emitting diode 13 is caused to emit red light (step 114 in FIG. 7), and at the same time, the ram control means 20J is controlled to stop the ram 4 (step 115 in FIG. 7). Further, when the operator confirms safety and continues the machining, the light-emitting diode 13 remains red and the ram 4 is lowered at 10 mm / sec (low closing speed) (in parentheses in step 115 in FIG. 7). ).

For this reason, the occurrence of an abnormal situation is instantly recognized by a person other than the worker on site, and the worker's rescue operation and adjustment work for resuming the processing are performed very quickly, ensuring safety. In addition, by adding a jig or the like, the operator can work while ensuring safety even in the case of light shielding at the unexpected ram position Z _C (inside the parentheses in FIG. 5 (1)).

  Next, in the second step (FIG. 5 (2)), the work W having the flange F formed in the first step is positioned, and the same operation as the first step (FIG. 5 (1)) is performed ( Step 106 to Step 115 in FIG.

Further, the third mode (FIG. 2) is performed when the mold information, bending information, workpiece information, etc. are known. As in the second mode described above, the optical safety device 1 (FIG. 1) is operated. Although used, it differs from the second mode in that the light shielding position Z _{1 and the} like are calculated based on the workpiece positioning posture state diagram α (FIG. 6).

  For example, when the worker S (FIG. 1) switches the NC device 20 to the third mode via the changeover switch means 20D and inputs the product information J (CAD information) via the input / output means 20B, the product information J After the bending order, the molds P and D, and the mold layout are determined, the workpiece positioning posture state diagram creating means 20F described above performs the workpiece positioning posture state diagram α (FIG. 6) for each bending process (step). Figure).

This workpiece positioning posture state diagram α is a diagram showing a posture state in which the workpiece W is abutted against the abutments 10 and 11 for each bending process, and the calculation means 20G refers to (see FIG. 1). The light shielding position Z ₁ is calculated according to the position and shape of the workpiece W.

Further, as described above, the calculation means 20G is based on the light shielding position Z ₁ and corresponds to the discoloration position (shift position) Z ₁ ′ (for example, (B) in FIG. 5 (1)) in actual bending. Blue → yellow, and 100 mm / sec (high speed) → 50 mm / sec (medium speed)), and the top dead center Z ₀ of the ram 4 (for example, equivalent to (A) in FIG. 5 (1)) The degree of the distance between the blades based on the ram position such as the discoloration position (shift position) Z ₁ ′ and the final stroke position Z ₂ (corresponding to (C) in FIG. 5 (1)) is calculated (the blade in the second mode in FIG. 2). The degree of distance A to C).

  Then, when the degree of the distance between the blades based on the calculated ram position is transmitted to the operator, the degree A to C of the distance between the blades, the color of light that the light emitting diode 13 should present, and the speed that the ram 4 should exhibit. Is stored in the storage means 20C (FIG. 1) (corresponding to the second mode of FIG. 2) for each bending process, and the ram position detecting means 15 (FIG. The light emission control means 20E1 and the ram control means 20J that have received the ram position signal from 1) control the light emitting diode 13 and the speed of the ram 4 while referring to this data table (FIG. 2).

In the third mode, unlike the trial bending in the second mode (FIG. 4), the operation of driving the ram 4 to store the light shielding position Z ₁ is not required, the operation is performed very quickly, and the processing time is reduced. Shortened. .

  The actual bending operation is the same as that in the above-described second mode (step 106 to step 115 in FIG. 7).

  The present invention enables the operator to confirm the distance between the blades between the punch and the die, thereby accurately informing the operator of the degree of danger and adjusting the ram speed to the degree of danger. This is useful for removing the anxiety and ensuring safety. Specifically, the first mode in which the optical safety device is not used (FIG. 2) and the second mode in which the optical safety device is used (trial bending → It can be used in each mode such as (actual bending process) or the third mode (calculation → actual bending process), and is very useful when applied not only to a descending press brake but also to an ascending press brake.

1 is an overall configuration diagram of the present invention. It is a figure which shows each mode by this invention. It is explanatory drawing of the 1st mode by this invention. It is explanatory drawing of the test bending in the 2nd mode by this invention. It is explanatory drawing of the actual bending process in the 2nd mode by this invention. It is explanatory drawing of the 3rd mode by this invention. It is a flowchart for demonstrating operation | movement of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Optical safety device 2 Light projector 3 Light receiver 4 Upper table 5 Lower table 6, 7 Hydraulic cylinder 8, 9 Side plate 10, 11 Abutting 12 Foot pedal 13 Light emitting diode 14 Speaker 15 Ram position detection means 20 NC device 20A CPU
20B Input / output means 20C Storage means 20D Changeover switch means 20E Transmission medium control means 20E1 Light emission control means 20E2 Sound generation control means 20F Work positioning posture state diagram creation means 20G Arithmetic means 20H Optical safety device control means 20J Ram control means D Die P Punch W Work

Claims (2)

In the vicinity of the machining position, there is provided an inter-blade distance transmitting means for transmitting to the operator the degree of the distance between the punch and the die based on the ram position, and the inter-blade distance transmitting means is a light emitting means for outputting light Alternatively, the sound generating means is configured to output sound, and the light emitting means outputs light whose color has changed based on a preset degree of the distance between the blades, and the sound generating means outputs sound whose interval has changed. Bending device characterized by The degree of the inter-blade distance based on the ram position is set in advance, and during actual bending, the inter-blade distance transmission means provided near the machining position is controlled based on the preset inter-blade distance. And control means for controlling the speed of the ram. The control means includes a first mode, a second mode, and a third mode, and the first mode is a means that does not use the optical safety device. The second mode and the third mode are means for using an optical safety device. In either mode, the transmission medium control means for changing the content of the transmission medium outputted by the inter-blade distance transmission means and the speed of the ram are changed. It has a ram control means that can be switched to each mode via the changeover switch means,
The second mode and the third mode have an optical safety device control means for controlling an optical safety device which is composed of a projector and a light receiver at both ends of the ram and whose optical axis is arranged below the punch tip. ,
The second mode has storage means for storing a light shielding position that is a position of the ram when the positioned workpiece is shielded from light at the time of trial bending ram driving,
The third mode has calculation means for calculating a light shielding position that is a position of the ram when the positioned work is shielded from light based on the workpiece positioning posture state diagram,
In the second mode or the third mode, when light is shielded at a position other than the stored or calculated light shielding position during actual bending, the occurrence of an abnormal situation is transmitted to the operator. A bending apparatus characterized in that the transmission medium control means changes the content of the transmission medium output by the inter-blade distance transmission means, and the ram control means changes the speed of the ram .

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