JP4836165B2 - Bending method and apparatus - Google Patents

Description

  The present invention detects the defective product and the good product at an early stage, thereby reducing the material cost by eliminating the waste of material, shortening the inspection time by omitting the inspection process after processing, and the delivery date of the good product A bending method and an apparatus for improving the overall processing efficiency are provided.

  2. Description of the Related Art Conventionally, a press brake has been provided with a workpiece positioning device as disclosed in, for example, Japanese Patent Application Laid-Open No. 5-7938. It has electromagnets on both sides of the contact surface.

With this configuration, when the work is brought into contact with the sensor, the work is attracted and fixed by exciting the electromagnet. Thereafter, the ram is driven so that the punch and the die approach, and the punch comes into contact with the work. Then (pinching point), the electromagnet is demagnetized, the workpiece is released, and a predetermined bending process is performed on the workpiece by a punch and a die.
JP-A-5-7938

  In recent years, high-mix low-volume production has become the mainstream, and the shape of workpieces has also become more complex. For this reason, the shape of the abutting part of the workpiece against the back gauge is also different for each bending process. .

  However, in the prior art, only one sensor is provided in the back gauge abutting portion. Therefore, for example, even if the workpiece is abutted against the back gauge while being tilted, the sensor is turned on and the It is considered that the contact state.

  As a result, a defective product is generated when the workpiece is processed while being tilted. Therefore, the processing needs to be performed again, and the processing efficiency is extremely deteriorated.

  Moreover, in order to improve processing efficiency, the processing method of abutting a workpiece | work against a back gauge may be performed in the state which made small the distance between the blades between a punch and die | dye.

  However, since the distance between the blades is small, in the prior art, the operator cannot visually check the contact state of the workpiece against the back gauge, and therefore the ON / OFF state of the sensor is not known. The contact state must be determined, and the burden on the operator is extremely large.

  In order to solve this problem, the applicant of the present application disclosed in the original application (Japanese Patent Application No. 2004-307854 filed on October 22, 2004) a means related to a bending method and its apparatus. Furthermore, there is a problem that the position of the workpiece is displaced during pull back after positioning the workpiece.

  That is, as shown in FIG. 9, normally, after positioning the workpiece W against the back gauge abutting portion 50 (FIG. 9 (A-1)), the ram is driven and the punch P (see FIG. 9 ( A-2)) When the pinching point PP is reached and the punch P comes into contact with the workpiece W, the workpiece W is clamped by the punch P and the die D.

  In this state, the abutting portion 50 moves backward (pullback) to prevent interference caused by the workpiece W jumping up, and continues to drive the ram, so that the punch P (FIG. 9A-3) and the die are moved. The workpiece W is bent at D.

  However, the plate thickness t of the actual workpiece W (FIG. 9 (B-1)) has an error from the nominal plate thickness. For example, if the plate thickness t is thin, at the set pinching point PP (FIG. 9 ( B-2)), the punch P does not come into contact with the workpiece W, and is in an unclamped state.

  Therefore, when the abutting portion 50 is retracted during pull back, the operator presses the workpiece W against the abutting portion 50, so that the workpiece W is also retracted as the abutting portion 50 is retracted (FIG. 9B-3). )), The bending line m deviates from the tip of the punch P, and a positional deviation occurs.

  As a result, even when bending is performed in a state in which the positional deviation has occurred (FIG. 9B-4), the dimension H ′ of the formed flange F is different from the original dimension H, and a defective product is generated. In addition, the material must be processed again, the material is wasted, the material cost is increased, the inspection process after processing is required, the inspection time is increased, and in this respect, the processing efficiency is extremely reduced. ing.

  In addition, since a post-processing inspection process is required, the time for distinguishing good products from defective products is delayed, which delays the time for delivering good products to customers. The overall processing efficiency up to the end is reduced.

  The object of the present invention is to detect defective products and good products at an early stage, thereby reducing material costs by eliminating waste of materials, shortening the inspection time by omitting the inspection process after processing, and good products A bending method and an apparatus for improving the overall processing efficiency are provided.

In order to solve the above problems, the present invention provides:
As described in claim 1, after positioning the workpiece W by abutting the workpiece W gripped by the operator S against the back gauge abutting portion 5, after the punch P reaches the preset pinching point PP. When the back gauge butting portion 5 is retracted, the contact confirmation sensors S ₁ , S ₂ , S ₃ and S ₄ provided on the back gauge butting portion 5 are used.
, S ₅ is turned ON, the plate thickness t of the workpiece W is thinner than the nominal plate thickness, and even if the punch P reaches the pinching point PP, it does not come into contact with the workpiece W. When the back gauge abutting portion 5 moves backward with the die D not being clamped, the bending line m position on the workpiece W deviates from the position of the tip end of the punch P, and the workpiece position shift occurs, resulting in failure / good. The signal output means 24H outputs a defect signal A for notifying the worker S of the occurrence of a defective product based on the workpiece W positional deviation, and the corresponding contact confirmation sensor S ₁
, S ₂ , S ₃ , S ₄ , S ₅ are OFF, the thickness t of the workpiece W is the same as the nominal thickness, and the punch P contacts the workpiece W at the same time as reaching the pinching point PP. The workpiece W moves away from the back gauge abutting portion 5 which is retracted in the state clamped by the punch P and the die D, so that the bending line m position on the workpiece W and the tip position of the punch P coincide with each other. W is properly positioned, and the defect / good signal output means 24H outputs a good signal B that informs the operator S of the occurrence of a good product based on the proper positioning of the workpiece W ,
As described in claim 2, a bending apparatus directly used for carrying out the bending method according to claim 1,
The back gauge abutting portion 5 is provided with contact confirmation sensors S ₁ , S ₂ , S ₃ , S ₄ , S ₅ for confirming contact with the workpiece W, and the punch P after the workpiece W positioning is preset. When the back gauge butting portion 5 moves backward after reaching the pinching point PP, the contact confirmation sensor S ₁
, S ₂ , S ₃ , S ₄ , S ₅ are turned ON, a failure signal A is output to notify the occurrence of a defective product based on the workpiece W position deviation, and the corresponding contact confirmation sensor S ₁
, S ₂ , S ₃ , S ₄ , S ₅ has a control means for outputting a good signal B that informs the generation of a good product based on the proper positioning of the workpiece W when OFF. apparatus,
As described in claim 3, a bending apparatus directly used for carrying out the bending method according to claim 1,
Contact confirmation sensors S ₁ , S ₂ , S ₃ , S ₄ provided in the back gauge abutting portion 5 for confirming contact with the workpiece W
, S ₅ and
Based on the product information J, the bending order, mold, etc. determining means 24G for presetting the pinching point PP that is the position of the upper surface of the workpiece W;
A pinching point arrival detecting means 27 for detecting that the punch P has reached a preset pinching point PP after positioning the workpiece W;
Based on the detection signal d from the pinching point arrival detection means 27, a back gauge control means 24F for retracting the back gauge abutting portion 5 by a predetermined amount;
If the contact check sensors S ₁ , S ₂ , S ₃ , S ₄ , and S ₅ are turned on when the back gauge abutting portion 5 is retracted, a failure signal A that informs the generation of a defective product based on the workpiece W position deviation. And the corresponding contact confirmation sensor S ₁
, S ₂ , S ₃ , S ₄ , S ₅ , the failure / good signal output means 24 </ b> H for outputting a good signal B notifying the occurrence of a good product based on the proper positioning of the workpiece W is provided. The technical means of the characteristic bending machine is taken.

  According to the configuration of the present invention described above, when the back gauge abutting portion 5 moves backward after the pinching point at which the punch P contacts the workpiece W (step 114 in FIG. 7), the ON / OFF state of the contact confirmation sensor is changed. By determining (step 115 in FIG. 7), when ON (YES), the defect signal A is output (step 116 in FIG. 7), and when OFF (NO), the good signal B is output. Therefore, the worker can find a defective product and a good product at an early stage.

  Therefore, there is no adverse effect of bending the workpiece W (FIG. 9 (B-4)) with the workpiece W being displaced (FIG. 9 (B-3)), the waste of the material is eliminated, and the material is saved. Costs can be reduced and inspection processes after processing can be omitted, so that inspection time can be reduced and inspection processes after processing can be omitted. Can be stored in the storage shelf, so that the delivery time of good products can be shortened, thereby improving the overall processing efficiency.

  Thereby, according to the present invention, by detecting defective products and good products at an early stage, the material cost can be reduced by eliminating waste of materials, and the inspection process after processing can be omitted to shorten the inspection time. In addition, there is an effect that it is possible to provide a bending method and an apparatus thereof that can advance the delivery date of a good product and improve the overall processing efficiency.

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

  This press brake has side plates 30 on both sides of the machine body, and an upper table 1 that is a ram is attached to the upper portion of the side plate 30 via a hydraulic cylinder 34, for example. A punch P is mounted through 32.

  A lower table 2 is disposed below the side plate 30, and a die D is mounted on the lower table 2 via a holding plate 33, and a side gauge 8 (FIG. 2) is moved in the left-right direction (X The position of the workpiece W is determined so as to be movable in the axial direction).

That is, the bending apparatus shown in FIG. 1 is a descending press brake, after a back gauge 7 (to be described later) disposed behind the lower table 2 and the workpiece W abutted against the side gauge 8 (step of FIG. 7 ). 108) When all the corresponding contact confirmation sensors are turned on (YES in step 109 in FIG. 7 ) and the foot pedal 6 is turned on (YES in step 110 in FIG. 7 ), the ram control means 24G (FIG. 1) If the hydraulic cylinder 34 is actuated to lower the ram 1 (step 111 in FIG. 7 ), the workpiece W is bent by the cooperation of the punch P and the die D (step 112 in FIG. 7 ).

  A back gauge 7 having an abutment portion 5 is provided behind the lower table 2 (FIG. 1), and the back gauge 7 is supported by the lower table 2 via, for example, a link mechanism (not shown). .

  A stretch 25 is provided between the link mechanisms on both sides of the lower table 2 (FIGS. 1 and 2) in the left-right direction (X-axis direction), and the stretch 25 has a butting portion 5 at the front. The abutting portion main body 26 is attached to an X-axis motor Mx (not shown) so as to be movable in the left-right direction, and a link mechanism is moved back and forth (Y-axis direction) by a Y-axis motor My (not shown). It is possible to move in the vertical direction (Z-axis direction).

With this configuration, the back gauge 7 is positioned at a predetermined position in advance by the back gauge / side gauge control means 24F (FIG. 1) described later (step 107 in FIG. 7 ).

The front surface of the abutting portion 5 (FIG. 2) is an abutting surface 5A against which the workpiece W is abutted. The abutting surface 5A has a plurality of contact confirmation sensors S ₁ , S ₂ , S ₃ , S ₄ and S ₅ are provided, and each contact confirmation sensor operates independently of each other so that the contact state of the workpiece W with respect to the back gauge 7 can be confirmed.

As shown in FIG. 3, each of the contact confirmation sensors S _{1 to} S ₅ has a predetermined amount of strokes of the workpiece contact portions C _{1 to} C ₅ with which the workpiece W contacts, and the workpiece contact portions. Stroke expansion levers E _{1 to} E ₅ that expand and micro switches M _{1 to} M ₅ that are turned on when the push button is pressed and moved by the stroke expanded by each stroke expansion lever are provided.

  Conventionally, in order to turn on the microswitch, the stroke of the push button is required to be 0.5 mm or more, and for that purpose, the stroke of the workpiece contact portion is also required to be 0.5 mm or more.

  For this reason, the workpiece contact portion must protrude considerably from the abutting surface of the back gauge abutting portion (for example, 0.5 mm or more), and therefore the burden on the operator who abuts the workpiece increases.

  In addition, once the micro switch is turned on, the workpiece is returned to the front (worker side) for some reason, and even if it moves in a direction away from the back gauge, it is separated by a predetermined distance (for example, 0.5 mm or more). Until then, the microswitch remains ON.

  Therefore, even if the workpiece is not properly in contact with the back gauge, for example, even if the workpiece is actually greatly inclined, the micro switch continues to be in the ON state, and the workpiece is processed as it is. It was the cause of defective products.

Therefore, as described above, the stroke expansion levers E _{1 to} E ₅ are provided between the workpiece contact portions C _{1 to} C ₅ (FIGS. 3 and 4B) and the micro switches M _{1 to} M _5. Accordingly, the work stroke of the abutment itself be relatively small (e.g., 0.2 mm (fine displacement)), the stroke Y ₂ of the push button of the microswitch, as in the prior art is relatively large (e.g., 0. 6 mm (enlarged displacement)), it was decided to turn on the microswitch having the same structure as before.

  For this reason, the problems as described above do not occur, and the burden on the operator is reduced.

In other words, conventionally, even if the workpiece is separated from the back gauge, the micro switch is in an ON state until the workpiece is separated by, for example, 0.5 mm or more, and there is a possibility that the workpiece is processed as it is. By providing the magnifying levers E _{1 to} E ₅ , in the same case, if the workpiece is separated by 0.2 mm or more, for example, the push button moves more than 0.6 mm and returns to the original position. The switch is immediately turned off and there is no risk of machining the workpiece.

Work contact portions C _{1 to} C ₅ constituting the contact confirmation sensors S _{1 to} S ₅ (FIG. 3) are spring-biased, and are usually forward of the abutting surface 5A (to the work W side). ), Approximately 0.2 mm.

Then, the workpiece abutting part C ₁ -C _5, the dimensions of each vertical direction (Z-axis direction) is substantially the same as the vertical dimension of the abutting surface 5A, thereby, the contact area between the workpiece W It has been expanded.

Further, the intervals between the workpiece contact portions C _{1 to} C ₅ (FIG. 4B) are equal, for example, approximately 5 mm, and the width (X-axis direction) of the middle workpiece contact portion C ₃ is relatively long. It is large (for example, about 10 mm), and the widths of the other workpiece contact portions C ₁ , C ₂ , C ₄ , C ₅ are relatively small (for example, about 5 mm). It can be supported.

A protrusion (for example, the protrusion C _5a (FIG. 4C) for the work contact portion C ₅ ) is provided at the rear part of the work contact portions C _{1 to} C ₅ having such a configuration. Enlargement levers E _{1 to} E ₅ are in contact with the front portions (work W side) of the enlargement levers E _{1 to} E ₅ , respectively.

Further, each of the enlarging levers E _{1 to} E ₅ can be swung with respect to the common swivel shaft 10 and also has a push button in front of the micro switches M _{1 to} M ₅ (for example, for the micro switch M ₅ , the push button M _5a (FIG. 4C).

As is well known, each of the micro switches M _{1 to} M ₅ comes into contact with the built-in movable contact and fixed contact when the push button is pushed and moved by about 0.5 mm by the expansion levers E _{1 to} E _5. As a result, an ON signal is output.

With this configuration, for example, by bringing the workpiece W into contact with the workpiece contact portion C ₅ of the contact confirmation sensor S ₅ (FIG. 4C), the workpiece contact portion C ₅ is pressed by 0.2 mm. Accordingly, the corresponding enlargement lever E ₅ turns counterclockwise, thereby pushing the push button M _5a of the micro switch M ₅ by a stroke that is almost tripled, that is, 0.6 mm. .

Accordingly, the push button M _5a is pushed by 0.5 mm or more which is a stroke necessary for turning on the micro switch M ₅ , and thereby the contact confirmation sensor S ₅ is turned on. Yes.

For example, when the workpiece W that has been in contact with the workpiece contact portion C ₅ (FIG. 4C) is separated from the workpiece W and the workpiece contact portion C ₅ returns to its original position by 0.2 mm, Accordingly, the corresponding expansion lever E ₅ pivots clockwise to return the push button M _5a of the micro switch M ₅ to the original position by 0.6 mm, which is a stroke that is approximately tripled. .

Accordingly, the push button M _5a is returned by 0.5 mm or more which is a stroke necessary for turning off the micro switch M ₅ , and thereby the contact confirmation sensor S ₅ is turned off. .

Thus using the contact confirmation sensors S ₁ to S ₅ for performing ON · OFF operation (Fig. 2), for example, during work positioning, as is well known, the plurality of contact confirmation sensors S ₁ to S _When all of the predetermined sensors ₅ (step 104 in FIG. 7) are turned on (step 109 in FIG. 7), the workpiece abutting portion and the back gauge abutting portion 5 are in proper contact with each other. The ram 1 is lowered by turning on the foot pedal 6 to perform the bending process (steps 110 to 111 in FIG. 7).

Further, for example, when the ram 1 is lowered (step 111 in FIG. 7) and the back gauge abutting portion 5 is retracted after the pinching point at which the punch P contacts the workpiece W as described above (FIG. 7). Step 114), it is determined whether the contact confirmation sensor is ON / OFF, and when at least one of the plurality of contact confirmation sensors S _{1 to} S ₅ is turned on (YES in Step 115 in FIG. 7), Assuming that the position shift of the workpiece W has occurred, the defect signal A is output (step 116 in FIG. 7), and when all the sensors are turned off (NO in step 115 in FIG. 7), Assuming that no positional deviation has occurred, a good signal B is output (step 117 in FIG. 7).

  Accordingly, as described above, the present invention, as already described, reduces the material cost by detecting the defective product and the good product at an early stage, and eliminates the inspection process after processing. Thus, it is possible to provide a bending method and an apparatus for shortening the inspection time, speeding up delivery of a good product, and improving the overall processing efficiency.

  On the other hand, when the foot pedal 6 is arranged in the vicinity of (FIG. 1) of the lower table 2 and all the corresponding contact confirmation sensors are turned on as described above (YES in step 109 in FIG. 11), The foot pedal 6 is turned on to perform the bending process (step 110 in FIG. 7).

Further, in (1) to the press brake is provided with a pinching point arrival detection unit, the pinching point arrival detection means, the punch P is preset pinching point PP (FIG. 5 (A), the FIG. 6 ( A)) is detected, and is constituted by, for example, a ram position detecting means 27 or a pressure detecting means.

  The ram position detecting means 27 detects that the punch P has reached a predetermined position of the upper surface of the workpiece W based on workpiece thickness information included in the product information J described later, that is, the punch P reaches the pinching point PP. As described above, the back gauge abutting portion 5 is retracted (step 114 in FIG. 7).

  The pressure detection means is, for example, a pressure sensor, and detects an increase in pressure when the punch P contacts the workpiece W.

  The press brake NC device 24 having such a configuration (FIG. 1) includes a CPU 24A, an input unit 24B, a storage unit 24C, a bending order / mold determining unit 24D, and a contact confirmation sensor determining unit 24E. The back gauge / side gauge control means 24F, the ram control means 24G, and the defect / good signal generation means 24H.

  The CPU 24A comprehensively controls the entire apparatus shown in FIG. 1, such as the bending order, the die determining means 24D, the contact confirmation sensor determining means 24E, etc., according to an operation procedure (for example, corresponding to FIG. 7) for carrying out the present invention.

  The input means 24B is composed of, for example, an operation panel movably attached to the upper table 1, and inputs product information J from the host NC device 23 (step 101 in FIG. 7). The input product information J is It is stored in the storage means 24C described later, and is used for determining the position of the pinching point PP, which is the position where the punch P contacts the workpiece W, in addition to the bending order, mold, mold layout, and the like (step 102 in FIG. 7).

  The product information J is, for example, CAD information, and includes information such as the thickness of the workpiece W, the material, the length of the bending line, the bending angle of the product, and the flange dimensions, and these are configured as a three-dimensional view and a development view. ing.

  Further, the host NC device 23 is installed, for example, in an office, and the NC device 24 is installed as a lower NC device for the host NC device 23, for example, in a factory where the press brake is provided.

  In the example shown in FIG. 1, product information J is built in the host NC device 23, and the NC device 24 provided with the product information J from the host NC device 23 controls the operation of the present invention ( FIG. 7).

  However, the present invention is not limited to this, and the host NC device 23 also has a bending order, a die determining means 24D, a contact confirmation sensor determining means 24E, etc., like the NC device 24. The host NC device 23 can directly control the operation of the present invention by performing predetermined data processing based on the built-in product information J (FIG. 7).

  Furthermore, the product information J can be manually input by the worker S itself, instead of inputting the product information J from the host NC device 23 to the input means 24B of the NC device 24.

  The storage means 24C (FIG. 1) stores the product information J as well as a machining program corresponding to the operation procedure according to the present invention, and the CPU 24A controls all operations according to this machining program (FIG. 7). Equivalent).

  The bending order / mold determining means 24D (FIG. 1) is based on the product information J, and the molds P and D used for each bending order and bending order (bending process) of the workpiece W, the mold layout, In addition to determining the position of the workpiece W and the position of the back gauge 7, the D value, the L value, and the position of the side gauge 8 are also determined. Further, as described above, the pinching point position is determined (see FIG. 7). Step 102).

  In this case, as is well known, the position of the back gauge 7 is a position in the front-rear direction (Y-axis direction) determined by the flange dimension of the workpiece W based on the product information J, the workpiece elongation amount, etc. Similarly, the position of the side gauge 8 (FIG. 2) is the position in the left-right direction (X-axis direction) determined by the bending line of the workpiece W based on the product information J (FIG. 1).

Based on the product information J, the contact confirmation sensor determining means 24E determines the shape of the abutting portion of the workpiece W against the back gauge 7 for each of the bending steps 1, 2,. Based on the contact state with the gauge abutting portion 5A, the contact confirmation sensor to be turned on when the workpiece W is abutted is determined from the plurality of contact confirmation sensors S _{1 to} S ₅ , as described above. When all of the determined contact confirmation sensors are turned on (YES in step 109 in FIG. 7), it is determined that the workpiece abutting portion is appropriately in contact with the back gauge abutting portion.

  The back gauge / side gauge control means 24F (FIG. 1) positions the back gauge 7 and the side gauge 8 at predetermined positions.

  In this case, for the important operation of the present invention (step 114 to step 118 with hatching in FIG. 7), the back gauge / side gauge control means 24F only controls the back gauge 7, for example, the back gauge The abutting portion 5 is retracted by a predetermined amount (FIG. 5B).

  Therefore, unless otherwise specified, the back gauge / side gauge control means 24F will be described as the back gauge control means 24F.

  The ram control means 24G (FIG. 1) controls the ram 1 by controlling the hydraulic cylinder 34, which is a ram drive source. For example, as described above, when the foot pedal 6 is turned on (FIG. 7). In step 110, YES), the hydraulic cylinder 34 is driven to lower the ram 1 (step 111 in FIG. 7).

  Further, the defective / good signal output means 24H (FIG. 1) is, as described above, when the back gauge abutting portion 5 is retracted (step 114 in FIG. 7) and the contact confirmation sensor is turned on (FIG. 1). 7), a defect signal A notifying the occurrence of a defective product based on the workpiece W position deviation is output, and when the corresponding contact confirmation sensor is turned OFF (NO in step 115 of FIG. 7), A good signal B that informs the occurrence is output.

  The defect / good signal output means 24H (FIG. 1) has, for example, a buzzer 24J, and outputs a defect signal A or a good signal B composed of a sound that can be recognized by an operator.

  The defect / good signal output means 24H can also output a defect signal A or a good signal B made of light such as a satellite.

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

(1) Operation until the punch P reaches the pinching point PP.
In this case, as is well known, the product information J is input from the host NC device 23 (step 101 in FIG. 7), and the pinching point position is determined in addition to the bending order, the mold, the mold layout, and the like. After (step 102 in FIG. 7), after performing a predetermined operation (steps 103 to 108 in FIG. 7), all the corresponding contact confirmation sensors of the plurality of contact confirmation sensors (FIG. 2) are turned on. In this case (YES in step 109 in FIG. 7), it is determined that the work abutting portion has properly contacted the back gauge abutting portion 5, so that the foot pedal 6 is turned on (step 110 in FIG. 7). ), The ram 1 is lowered (step 111 in FIG. 7), whereby the punch P reaches the pinching point PP (step 114 in FIG. 7).

(2) Backward movement of the back gauge butting portion 5.
Then, after the punch P reaches the pinching point PP (after the pinching point), the back gauge butting portion 5 moves backward (step 114 in FIG. 11).

  That is, while the ram 1 is descending (step 111 in FIG. 7), the CPU 24A (FIG. 1) monitors the position of the ram 1 via the ram position detecting means 27 and the punch P reaches the pinching point PP. When the detection signal d to the effect is transmitted from the ram position detection means 27 to the back gauge control means 24F, it is considered that the workpiece W is clamped by the punch P and the die D, and the back gauge control means The back gauge abutting portion 5 is retracted by a predetermined amount via 24F (FIG. 5A or FIG. 6A).

(3) Judgment operation of whether or not the contact confirmation sensors S _{1 to} S ₅ are turned on.
Next, it is determined whether or not the contact confirmation sensors S _{1 to} S ₅ are turned on (step 115 in FIG. 7).

  That is, when the CPU 24A detects the backward movement of the back gauge abutting portion 5 (step 114 in FIG. 7), it determines whether or not the contact confirmation sensor provided in the back gauge abutting portion 5 is turned on. Judgment is made (step 115 in FIG. 7).

(4) Operation when the contact confirmation sensor is turned on.
As a result of the determination, if the contact confirmation sensor is turned on (YES in step 115 in FIG. 7), a defect signal A is output (step 116 in FIG. 7).

  That is, in this case, as shown in FIG. 5, the punch P reaches the pinching point PP (FIG. 5 (A)), but the plate thickness t of the workpiece W is different from the nominal plate thickness, and the plate thickness is actually thin. t, and the workpiece W is in an unclamped state.

  For this reason, when the back gauge abutting portion 5 is retreated (FIG. 5B), the operator presses the workpiece W against the abutting portion 5, so that the workpiece W is also retreated along with the retreat of the abutting portion 5. As a result, the workpiece W comes into contact with the abutting portion 5 and the contact confirmation sensor is turned ON (as described above, when a plurality of contact confirmation sensors are provided, at least 1 One should be ON).

  As a result, the bending line m on the workpiece W is shifted from the tip of the punch P, and a positional shift occurs.

  The defect / good signal output means 24H receiving this ON signal (FIG. 5C) assumes that a defective product has occurred due to the displacement of the workpiece W and outputs a defect signal A via the buzzer 24J. The operator S is notified of the occurrence of defective products.

  In addition, the ram 1 (FIG. 1) can be stopped simultaneously with the output of the defect signal A.

(5) Operation when the contact confirmation sensor is not turned ON.
As a result of the determination, if the contact confirmation sensor is not turned on (NO in step 115 in FIG. 7), that is, if the contact confirmation sensor is turned off, a good signal B is output (FIG. 7). Step 117), the ram 1 continues to descend (step 118 in FIG. 7), bending is performed (step 112 in FIG. 7), and when a predetermined stroke is reached (YES in step 113 in FIG. 7), bending is performed. Finish processing.

  That is, in this case, as shown in FIG. 6, the thickness t of the workpiece W (FIG. 6A) is the same as the nominal thickness, there is no error, and the punch P reaches the pinching point PP at the same time. The workpiece W is clamped by the punch P and the die D.

For this reason, when the back gauge abutting portion 5 is retreated (FIG. 6B), the workpiece W does not abut against the abutting portion 5 and the contact confirmation sensors S _{1 to} S ₅ are turned off (existing) As described above, when a plurality of contact confirmation sensors are provided, all are in the OFF state).

  As a result, the bending line m on the workpiece W coincides with the tip of the punch P in contact with the workpiece W, the workpiece W is properly positioned, and the lowering of the ram 1 (FIG. 1) is continued, so that the desired dimension H ( A flange F having FIG. 6C is formed, and a good product is generated.

In this case, as described above, the contact confirmation sensors S _{1 to} S ₅ are in the OFF state (FIG. 6B). The good signal output means 24H (FIG. 6D) assumes that a good product has been generated due to proper positioning of the workpiece W, and outputs a good signal B through the buzzer 24J to generate a good product. Inform worker S.

  FIG. 8 shows another example of the operation of the present invention, which is a case where the ram 1 does not stop at the mute point, unlike FIG. 7 (step 106 in FIG. 7).

(1) Operation from the top dead center until ram 1 descends.
As shown in FIG. 8, at first, the same operation as from step 101 to step 104 in FIG. 7 is performed, and then the back gauge 7 (FIG. 2) and the side gauge 8 are positioned at predetermined positions (FIG. 8). Step 201), the work W is abutted against the back gauge 7 and the side gauge 8 (Step 202 in FIG. 8), and when all corresponding contact confirmation sensors are turned on (YES in Step 203 in FIG. 8), the work W Is assumed to have been positioned, and when the foot pedal 6 is turned on (YES in step 204 in FIG. 8), the ram 1 is lowered from the top dead center (step 205 in FIG. 8).

(2) Operation when the workpiece W remains in contact with the back gauge abutting portion 5 while the ram 1 is descending from the top dead center and all the corresponding contact confirmation sensors are ON.

  In this case, when all the corresponding contact confirmation sensors are turned on (YES in step 206 in FIG. 8), it is considered that the positioning of the workpiece W has been completed, and the ram 1 continues to descend (FIG. 8). Step 214), the process proceeds to Step 114 of FIG. 7 described above, and the same operation from Step 114 to Step 113 of FIG. 7 is performed, whereby the defect signal A or the good signal is obtained via the defect / good signal output means 24H. B is output to inform the operator of the occurrence of defective or good products.

(3) Operation when the workpiece W is separated from the back gauge abutting portion 5 while the ram 1 is descending from the top dead center, and all the corresponding contact confirmation sensors are not turned ON.

  In this case, when all the corresponding contact confirmation sensors are not turned ON (NO in step 206 in FIG. 8), that is, when at least one of the corresponding contact confirmation sensors is turned OFF. When the lowering ram 1 is stopped (step 207 in FIG. 8), the workpiece W is again abutted against the back gauge 7 and the side gauge 8 (step 208 in FIG. 8), and all corresponding contact confirmation sensors are turned on. (YES in step 209 in FIG. 8), it is considered that the positioning of the workpiece W has been completed, and then it is determined whether or not the foot pedal 6 is turned on (step 210 in FIG. 8).

  If the foot pedal 6 is on (YES in step 210 in FIG. 8), the foot pedal 6 is once turned off (step 213 in FIG. 8) and then turned on again (steps on again) (step 213). Step 211 in FIG. 8), the ram 1 is lowered (step 212 in FIG. 8) to prevent danger.

  If the foot pedal 6 is not turned on (NO in step 210 in FIG. 8), the foot pedal 6 is turned on as it is (step 211 in FIG. 8) to lower the ram 1 (step in FIG. 8). 212).

  After the lowering of the ram 1 (step 212 in FIG. 8), the process proceeds to step 114 in FIG. 7 described above, and similarly, the same operation is performed from step 114 to step 113 in FIG. A defect signal A or a good signal B is output via the output means 24H to notify the operator of the occurrence of a defective product or a good product.

  According to the present invention, after the workpiece positioning, when the back gauge abutting portion is retracted after the punch contacts the workpiece, the failure signal is determined according to the ON / OFF state of the contact confirmation sensor provided in the back gauge abutting portion.・ Used in bending methods and devices that output good signals to detect defective products and good products at an early stage, thereby eliminating material waste and reducing material costs, and eliminating post-processing inspection processes. This is useful for shortening the inspection time, speeding up the delivery of good products, and improving the overall processing efficiency. Specifically, it is applied not only to the descending press brake, but also to the ascending press brake, In either case, it is extremely useful.

1 is an overall view showing an embodiment of the present invention. It is a perspective view of the back gauge 7 which comprises this invention. It is a perspective view which shows the detail of FIG. It is the front view which shows the detail of FIG. 2, a top view, and a side view. In this invention, it is operation | movement explanatory drawing when a defective product generate | occur | produces. In this invention, it is operation | movement explanatory drawing when a favorable product generate | occur | produces. It is a flowchart for demonstrating operation | movement of this invention (when the ram 1 stops at a mute point). It is a flowchart for demonstrating the other operation | movement of this invention (when the ram 1 does not stop at a mute point). It is explanatory drawing of a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Upper table 2 Lower table 5 Abutting part 6 Foot pedal 7 Back gauge 8 Side gauge 9 Operation screen 10 Rotating axis 23 Host NC device 24 NC device 24A CPU
24B Input means 24C Storage means 24D Bending order, mold determination means 24E Contact confirmation sensor determination means 24F Back gauge / side gauge control means 24G Ram control means 24H Defect / good signal generation means 24J Buzzer 25 Stretch 26 Abutment body 27 Ram position detection means 30 Side plate 32 Intermediate plate 33 Holding plate 34 Hydraulic cylinder D Die P Punch W Workpiece

Claims (8)

After the workpiece is positioned by abutting the workpiece gripped by the operator on the back gauge abutting portion, the back gauge abutting portion is moved to the back gauge abutting portion when the back gauge abutting portion is retracted after the punch has reached a preset pinching point. When the provided contact confirmation sensor is turned ON, the workpiece thickness is thinner than the nominal thickness, and even if the punch reaches the pinching point, it does not contact the workpiece. When the back gauge abutting part is retracted in the unclamped state, the position of the bending line on the workpiece and the position of the punch tip are shifted, causing a workpiece position shift. the occurrence of defective products based on outputs a defect signal to inform the operator, when the abutment confirmation sensor is turned OFF, the plate of the work Is equal to the nominal plate thickness, and when the punch reaches the pinching point, the workpiece contacts the workpiece at the same time, and the workpiece is separated from the back gauge abutting portion which is retracted in a state of being clamped by the punch and the die. The upper bend line position coincides with the punch tip position, the work is properly positioned, and the defect / good signal output means outputs a good signal that informs the operator of the occurrence of a good product based on the proper positioning of the work. A bending method characterized by that. A bending apparatus directly used for carrying out the bending method according to claim 1,
The back gauge abutting part is provided with a contact confirmation sensor that confirms contact with the workpiece. When the back gauge abutting part moves backward after the punch reaches the preset pinching point after positioning the work, When the confirmation sensor is turned on, it outputs a failure signal notifying the occurrence of a defective product based on the workpiece position deviation, and when the corresponding contact confirmation sensor is turned off, it notifies the occurrence of a good product based on the proper positioning of the workpiece. A bending apparatus comprising control means for outputting a good signal. A bending apparatus directly used for carrying out the bending method according to claim 1,
An abutment confirmation sensor provided at the back gauge abutting portion to confirm abutment with the workpiece;
Based on the product information, a bending order, a die, etc. determining means for presetting a pinching point that is a work upper surface position;
A pinching point arrival detecting means for detecting that the punch has reached a preset pinching point after the workpiece positioning;
Based on the detection signal from the pinching point arrival detection means, back gauge control means for retracting the back gauge abutting portion by a predetermined amount;
If the contact check sensor is turned on when the back gauge abutting part is retracted, a failure signal is output to notify the occurrence of a defective product based on the work position deviation. If the contact check sensor is turned off , A bending apparatus characterized by having a defect / good signal output means for outputting a good signal informing the generation of a good product based on proper positioning . 4. The bending apparatus according to claim 3, wherein the pinching point arrival detecting means is constituted by a ram position detecting means for detecting that the punch has reached a workpiece upper surface position determined in advance by workpiece thickness information. The contact confirmation sensor is provided in a plurality, and outputs a failure signal when at least one contact confirmation sensor is turned on, and outputs a good signal when all contact confirmation sensors are turned off. The bending method described. The bending method according to claim 1, wherein the failure signal and the good signal are sound or light that can be recognized by an operator. The contact confirmation sensor is provided in a plurality, and outputs a failure signal when at least one contact confirmation sensor is turned on, and outputs a good signal when all the contact confirmation sensors are turned off. Or the bending processing apparatus of 3. The bending apparatus according to any one of claims 2, 3, and 7 , wherein the defect signal and the good signal include sound or light that can be recognized by an operator.

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