JP3668895B1 - Bending method and apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately determine whether or not the workpiece abutting portion is in proper contact with the back gauge abutting portion, regardless of the shape of the abutting portion of the workpiece against the back gauge. Provided are a bending method and an apparatus for preventing generation of defective products, improving processing efficiency, and reducing the burden on an operator.
In a bending apparatus, a plurality of contact confirmation sensors S ₁ , S ₂ , S ₃ , S ₄ , S ₅ for confirming contact with a workpiece W are provided in one back gauge abutting portion 5. When the workpiece is abutted, the ram 1 is set on condition that all the sensors specified automatically or manually among the corresponding contact confirmation sensors S ₁ , S ₂ , S ₃ , S ₄ , S ₅ are turned on and the foot pedal 6 is turned on. There is a control means for driving.
[Selection] Figure 1

Description

  The present invention accurately determines whether or not the workpiece abutting portion is in proper contact with the back gauge abutting portion regardless of the shape of the abutting portion of the workpiece against the back gauge. The present invention relates to a bending method and apparatus for preventing generation of defective products, improving processing efficiency, and reducing the burden on an operator.

  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 an appropriate 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.

  An object of the present invention is to accurately determine whether or not the workpiece abutting portion is appropriately in contact with the back gauge abutting portion, regardless of the shape of the abutting portion of the workpiece against the back gauge. Accordingly, there is provided a bending method and apparatus for preventing the generation of defective products, improving the processing efficiency, and reducing the burden on the operator.

In order to solve the above problems, the present invention provides:
As described in claim 1, based on the product information J, for each bending process 1, 2,..., The mold, the mold layout, the position of the workpiece W, the position of the back gauge 7, the back gauge of the workpiece W. After determining the shape of the abutting portion with respect to 7, based on the contact state between the workpiece abutting portion and the back gauge abutting portion 5, a plurality of contact confirmations provided on one back gauge abutting portion 5 are confirmed. From the sensors S ₁ , S ₂ , S ₃ , S ₄ , and S _5, a contact confirmation sensor to be turned on when the workpiece W is abutted is determined. 6. A bending method characterized in that the ram 1 is driven to bend the workpiece W under the condition of ON of 6, and in the bending apparatus as described in claim 5, one back gauge abutting portion 5 And contact with the workpiece W A plurality of contact confirmation sensors _{S 1, S 2, S 3} , S 4, S 5 which certified provided, during the work abutting, abutment confirmation sensors _{S 1, S 2, S 3} , in the S _4, S ₅ Technical means of a bending apparatus characterized by having control means for driving the ram 1 on condition that all of the sensors designated automatically or manually are turned on and the foot pedal 6 is turned on is provided.

According to the configuration of the present invention, a plurality of contact confirmation sensors S _{1 to} S ₅ are provided in one back gauge abutting portion 5 (FIG. 2), so that the actual workpiece W is abutted (step of FIG. 11). 108) If all the corresponding contact confirmation sensors are turned on (YES in step 109 in FIG. 11) and the foot pedal 6 is not turned on (YES in step 110 in FIG. 11), the ram 1 is not lowered. Therefore, the bending process is performed in a state where the workpiece W is tilted, a defective product is generated, and there is no adverse effect such that the machining is repeated many times, and the machining efficiency is improved.

  Further, at the time of actual workpiece abutment (step 108 in FIG. 11), the operator S (FIG. 1) confirms the corresponding contact by simply abutting the workpiece W against the back gauge 7 and the side gauge 8 (FIG. 2). When all the sensors are turned on (YES in step 109 in FIG. 11), the workpiece abutting portion properly comes into contact with the back gauge abutting portion, so that the distance between the punch P (FIG. 1) and the die D is between the blades. Even if is small, the troublesome operation of the operator S judging the contact state of the workpiece W against the back gauge 7 only with the sense of the hand becomes unnecessary, and the burden on the operator S is reduced.

  Thus, according to the present invention, regardless of the shape of the abutting portion of the workpiece against the back gauge, it is accurately determined whether or not the workpiece abutting portion is appropriately in contact with the back gauge abutting portion. Thus, it is possible to provide a bending method and apparatus that prevent the generation of defective products, improve processing efficiency, and reduce the burden on the operator.

  Moreover, according to this invention, based on the product information J, the shape of the abutting part with respect to the back gauge 7 of the workpiece | work W is determined for every bending process (process drawing), and this workpiece abutting part is back gauge abutting The contact confirmation sensor necessary for accurately determining whether or not the member 5 is properly contacted is automatically determined, for example, via the contact confirmation sensor determination means 24E of the NC device 24 (FIG. 1). Therefore, the bending method and the apparatus according to the present invention have an effect that they can be used for all the workers S without increasing the number of setup man-hours without depending on the skill level of the workers S.

Furthermore, according to the present invention, the one back gauge abutting portion 5 (FIG. 3) includes a plurality of contact confirmation sensors S _{1 to} S ₅ that are provided with workpiece contact portions C _{1 to} C ₅ , By providing stroke expansion levers E _{1 to} E ₅ between the micro switches M _{1 to} M ₅ , for example, compared to the stroke Y ₂ (FIG. 5) of the push button M _5a of the micro switch M ₅ , Since the stroke Y ₁ of the contact portion C ₅ can be reduced, the protrusion amount of the workpiece contact portions C _{1 to} C ₅ from the abutting surface 5A (FIG. 3) of the back gauge abutting portion 5 is reduced. It is possible to reduce the burden on the operator when the workpiece is abutted, and it is small if the workpiece W abutted against the back gauge 7 is pushed away from the abutting portion 5 and pushed forward (operator side). stroke Y ₁ workpiece abutting part C ₁ (FIG. 5) By -C ₅ also returned to the front, back to larger push button stroke Y ₂ are the original moving in the same direction position it, a micro switch M ₁ ~M ₅ became ON once turned OFF immediately Therefore, the processing can be stopped at that time, and there is an effect that generation of defective products is prevented.

Furthermore, according to the present invention, the back gauge abutting portion 5 (FIG. 3) is provided with only the contact confirmation sensors S _{1 to} S ₅ , and the conventional work fixing means (electromagnet) is not required. Therefore, the configuration of the back gauge abutting portion 5 becomes extremely simple, and there is an effect that the cost is reduced accordingly.

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 (described later) disposed behind the lower table 2 and the workpiece W abuts against the side gauge 8 (step of FIG. 11). 108) When all the corresponding contact confirmation sensors are turned on (YES in step 109 in FIG. 11) and the foot pedal 6 is turned on (YES in step 110 in FIG. 11), the ram control means 24G (FIG. 1) If the hydraulic cylinder 34 is actuated to lower the ram 1 (step 111 in FIG. 11), the workpiece W is bent by the cooperation of the punch P and the die D (step 112 in FIG. 11).

  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 abutment body 26 is attached to an X-axis motor Mx (not shown) so as to be movable in the left-right direction. Further, a link mechanism is moved back and forth (Y-axis direction) by a Y-axis motor My (not shown), and a Z-axis motor Mz. 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. 11).

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 includes a workpiece contact portion C _{1 to} C ₅ with which the workpiece W contacts and a stroke Y ₁ (see FIG. 5) of each workpiece contact portion. ) and stroke enlargement lever E ₁ to E ₅ to expand by a predetermined amount, microswitch M ₁ ~M button pressed by a stroke Y ₂ which is magnified by each stroke enlargement lever (Fig. 5) is turned oN when pressed and moved _{Has 5} .

  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, in the present invention, as described above, the stroke expansion levers E _{1 to} E ₅ are disposed between the workpiece contact portions C _{1 to} C ₅ (FIGS. 3 and 4B) and the micro switches M _{1 to} M _{5. 5} , the stroke Y ₁ of the workpiece contact portion itself (FIG. 5) is relatively small (for example, 0.2 mm (minute displacement)), but the stroke Y ₂ of the push button of the micro switch is Similarly, it was made relatively large (for example, 0.6 mm (enlarged displacement)), and the microswitch having the same structure as the conventional one was turned on.

  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 the workpiece may be processed as it is. In the same case, if the workpiece is separated by 0.2 mm or more, for example, the push button moves 0.6 mm or more and returns to the original position. There is no risk of processing.

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. .

Therefore, 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 .

In this case, the enlargement lever E ₅ turns counterclockwise as described above, but the stroke required to turn on the micro switch M ₅ is an extremely small value such as 0.6 mm. It may be considered that the vehicle travels straight in the front-rear direction (Y-axis direction (FIG. 4C)).

Thus, for example, the contact confirmation sensors S _5, press the button M _5a of the contact portion C ₅ and expansion lever E ₅ and the micro switch M ₅ are all well and considered to be straight in the longitudinal direction, like this under the assumption, the relationship between the stroke Y ₁ of the contact portion C _5, the stroke Y ₂ of the enlarged lever E ₅ is, as shown in FIG.

In FIG. 5, the distance between the center a of the pivot shaft 10 and the protrusion C _5a (center b) of the contact portion C ₅ is L ₁ , and the center a of the pivot shaft 10 and the push button M _5a (center of the micro switch M ₅ Assuming that the distance between c) is L ₂ , it is apparent from the figure that Y ₁ / Y ₂ = L ₁ / L ₂ , whereby the following equation is established.

Y ₂ = (L ₂ / L ₁ ) × Y ₁ ... (1)

Accordingly, in the formula (1), if L ₂ / L ₁ is set to be 3 in advance, when the stroke Y _{1 of} the workpiece contact portion C ₅ = 0.2 mm, the enlargement lever E ₅ Stroke Y ₂ = 0.6 mm.

FIG 5 may be considered as the horizontal axis represents time axis, expanding lever E ₅ and workpiece abutting part C ₅ of the same rate starting from the same point in time, according to the equation (1), the workpiece abutting part C ₅ When the lens moves straight by the stroke Y ₁ , the enlargement lever E ₅ moves straight by the stroke Y ₂ , whereby the push button M _5a is pressed by the stroke Y ₂ and the micro switch M ₅ is turned on.

  On the other hand, the side gauge 8 (FIG. 2) is movable in the left-right direction (X-axis direction) along the lower table 2 as described above. In order to avoid interference with the molds P and D, the position of the workpiece in the left-right direction is determined.

  However, in the present invention, as described above, in order to improve the processing efficiency, when the processing is performed with the distance between the blades of the molds P and D being reduced, the contact state of the workpiece with the back gauge is reduced. It may be difficult for the operator to determine whether the corresponding contact confirmation sensors are all ON (step 109 in FIG. 11). For this reason, the side gauge 8 and the back gauge 7 may be difficult to determine. (FIG. 6) The workpiece W is positioned by abutting the workpiece W.

  That is, the worker S only positions the workpiece W against the back gauge 7 and the side gauge 8, and the workpiece W is positioned. As a result, whether or not the workpiece abutting portion properly contacts the back gauge abutting portion. This makes it easier for the worker S to make a decision.

  Further, a foot pedal 6 is disposed in the vicinity of the lower table 2 (FIG. 1), and as described above, all corresponding contact confirmation sensors are turned ON (YES in step 109 in FIG. 11), and this foot When the pedal 6 is stepped on and turned on by the operator S (YES in step 110 in FIG. 11), the ram control means 24G (FIG. 1) that detects it operates the hydraulic cylinder 34 to lower the ram 1 ( Step 111 in FIG. 11), bending is performed (step 112 in FIG. 11).

  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 and the ram control means 24G.

  The CPU 24A comprehensively controls the entire apparatus shown in FIG. 1, such as the bending order, the mold determining means 24D, the contact confirmation sensor determining means 24E, etc., according to an operation procedure (for example, corresponding to FIG. 11) 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. 11). The data is stored in a storage unit 24C described later, and is used for determining a bending order, a mold, a mold layout, and the like. 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. 11). 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. 11).
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.

  This input means 24B has an operation screen 9, and as will be described later (FIG. 9), a bending confirmation sensor determined by, for example, the contact confirmation sensor determination means 24E is bent on the operation screen 9, for example. Displayed for each of 1, 2,... And for each of the left and right abutting portions 5, and in turn, contact between the workpiece abutting portion and the back gauge abutting portion 5 for each bending step 1, 2,. If the state is displayed, it is possible to accurately guide the positioning operation of the workpiece W of the worker.

  The storage means 24C (FIG. 1) stores the product information J, as well as a database (FIG. 8) to be described later, a machining program corresponding to the operation procedure according to the present invention, and the CPU 24A performs all operations according to this machining program. Is controlled (corresponding to FIG. 11).

  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 (step 102 in FIG. 11).

  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. 6) is the position in the left-right direction (X-axis direction) determined by the bending line m of the workpiece W (FIG. 6) 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 .

  That is, according to the product information J (FIG. 1), the shape of the abutting portion of the work W for each bending process can be created (process diagram). Based on the contact state between the back gauge abutting portion 5 and the back gauge abutting portion 5, a contact confirmation sensor to be turned on when the workpiece is abutted is determined.

  For example, as shown in FIG. 6, the simplest workpiece abutting portion has a flat end surface shape over the entire left and right direction. In this case, the end surface is determined based on the length of the bend line m. When the two abutting portions 5 of the back gauge 7 are abutted against each other, the workpiece W is positioned without being inclined.

That is, if the workpiece abutting portion properly contacts the back gauge abutting portion, all the contact confirmation sensors S _{1 to} S _{5 of the} two abutting portions 5 are turned on.

Therefore, according to the contact confirmation sensor determining means 24E, ON should do contact confirmation sensor when the workpiece W abutting with respect the left and right contact portion 5 is determined to be all from S ₁ to S _5.

  Then, the determination result is converted into a database as a contact confirmation sensor to be turned on at the time of abutting the workpiece in the bending step 1 as shown in FIG. 8 (◯ is ON, / is OFF), and the storage means 24C The CPU 24A searches when the ram 1 is driven via the ram control means 24G.

For example, as shown in FIG. 2, the shape of the workpiece abutting portion includes flanges F ₁ and F ₂ having relatively narrow widths (X-axis direction). In this case, the position of the workpiece W and both Judging from the respective widths of the flanges F ₁ and F ₂ and the distance between them, the workpiece W is positioned without being inclined when it is abutted against a part of the two abutting portions 5 of the back gauge 7. The

That is, with respect to the left side of the abutting portion 5 of the two abutment portions 5, contact confirmation sensors S ₂ and S ₃ are, with respect to the right side of the abutting portion 5, the contact confirmation sensor S ₄ and S ₅ When all of them are turned on, it is determined that the workpiece abutting portion is appropriately in contact with the back gauge abutting portion.

Therefore, according to the contact confirmation sensor determining means 24E, ON should do contact confirmation sensors during workpiece W abutting, with respect to the abutting portion 5 of the left, a contact confirmation sensors S ₂ and S _3, right For the abutting portion 5 is determined to be a contact confirmation sensors S ₄ and S _5.

  Then, the determination result is similarly stored as a database as shown in FIG. 8 (○ is ON, / is OFF) as a contact confirmation sensor to be turned ON at the time of abutting the workpiece in the bending step 2, for example. The data is stored in the means 24C and searched when the ram control means 24G drives the ram 1 (FIG. 1).

  Further, as the shape of the workpiece abutting portion, for example, as shown in FIG. 7, one of the contact confirmation sensors constituting the one abutting portion 5 of the back gauge 7 having a very narrow width or a small interval. If the part is turned ON, the workpiece abutting part may appropriately abut on the back gauge abutting part.

7A shows the contact check sensors S ₂ , S ₃ , S ₄ , FIG. 7B shows the contact check sensor S ₃ , and FIG. 7C shows the contact check sensor S ₃ . ₂ , S ₄ , S ₅ are shown in FIG. 7D. When the contact confirmation sensors S ₁ , S ₂ , S ₃ are all turned on, the workpiece abutting portion is suitable for the back gauge abutting portion. It is judged that it is contacting.

Therefore, according to the abutment confirmation sensor determination means 24E, the abutment confirmation sensor to be turned on when the workpiece is abutted is, for example, in the case of FIG. 7A, the abutment confirmation sensor S ₂ of the abutment portion 5 on the left side. , S ₃ , S ₄ , etc.

  In the case of FIG. 7 as well, a database is similarly stored and stored in the storage means 24C (corresponding to FIG. 8), and the ram control means 24G searches (when FIG. 1) drives the ram 1. It has become.

  As described above, according to the present invention, the workpiece abutting portion appropriately contacts the back gauge abutting portion regardless of the shape of the abutting portion of the workpiece against the back gauge from large to small. It can be accurately determined whether or not.

  That is, as in the prior art (Japanese Patent Laid-Open No. 5-7938), when there is only one sensor, the workpiece is in contact with an inclination, so that the sensor and the back gauge are turned on even in a point contact state. Is deemed to be in proper contact with each other, and an erroneous determination is made.

  However, as in the present invention, when all of the corresponding sensors among the plurality of sensors are set to an appropriate contact condition between the workpiece and the back gauge, the so-called surface contact state of the entire workpiece abutting portion is obtained. Since it can be confirmed, the contact determination between the workpiece and the back gauge is accurately performed, thereby preventing the occurrence of defective products, improving the processing efficiency and reducing the burden on the operator.

  Further, conventionally, when a hole is formed in the workpiece abutting portion or the workpiece abutting portion has a strip shape (corresponding to FIG. 7C), contact with one sensor is impossible. According to the present invention, this problem is eliminated by providing a plurality of sensors.

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

  That is, after the contact confirmation sensor determining means 24E determines the contact confirmation sensor to be turned on when the workpiece is abutted for each bending process (step 104 in FIG. 11), the foot pedal 6 is turned on (FIG. 11). Since the ram 1 descends and stops at the mute point (step 106 in FIG. 11), the back gauge / side gauge control means 24F that has detected it causes the operator S (FIG. 1). In order to abut the workpiece W (step 108 in FIG. 11), the back gauge 7 and the side gauge 8 are positioned at predetermined positions (step 107 in FIG. 11).

  The ram control means 24G (FIG. 1) controls the driving of the ram 1 by controlling the hydraulic cylinder 34 which is a ram driving source.

  For example, the ram control unit 24G searches the database stored in the storage unit 24C (FIG. 8), and all the contact confirmation sensors to be turned on at the time of abutting the workpiece in each bending process 1, 2,. (YES in step 109 in FIG. 11) and when the foot pedal 6 is turned on (YES in step 110 in FIG. 11), the hydraulic cylinder 34 is driven to lower the ram 1 (step 111 in FIG. 11). W is bent (step 112 in FIG. 11).

  FIG. 9 shows another embodiment of the present invention. By displaying an abutment confirmation sensor to be turned on on the operation screen 9 of the input means 24B described above, the work for abutting the workpiece is corrected. Made it easier.

That is, when the contact confirmation sensor determining means 24E determines the contact confirmation sensor to be turned on at the time of abutting the workpiece for each bending process (step 104 in FIG. 11, FIG. 8), as shown in FIG. In addition, for example, at the lower part of the operation screen 9, the contact confirmation sensors S ₁ , S ₂ , S ₃ , for every bending step 1, 2,. Displays the ON / OFF state of S ₄ and S ₅ (○ is ON, / is OFF).

Further, for example, in the upper part of the operation screen 9, the shape of the abutting portion of the workpiece W against the back gauge 7 and the workpiece abutting portion and the back gauge abutting at that time in each bending process 1, 2. The contact state with the unit 5 is displayed, and the contact confirmation sensor to be turned on when the workpiece is abutted is displayed so that it can be identified by color (in the case of illustration, S ₃ and S above the operation screen 9). ₄ is displayed in red, for example).

With this configuration, for example, when the bending process 1 is being performed, if the worker hits the workpiece W against the left abutting portion 5 without inclining, then the corresponding operation is performed below the operation screen 9. Since the contact confirmation sensors S ₃ and S ₄ blink, the operator can easily confirm the contact state between the workpiece W and the back gauge 7, and the work abutting operation can be easily corrected.

  In FIG. 9, since the contact state between the abutting portion of the workpiece and the back gauge abutting portion 5 is displayed on the operation screen 9 for each of the bending steps 1, 2,... The positioning operation in the left-right direction (X-axis direction) can be accurately guided. Therefore, in the present embodiment, the side gauge 8 (FIG. 2) is not necessarily required.

  As yet another embodiment, among the plurality of contact confirmation sensors displayed on the operation screen 9, the operator himself / herself selects a contact confirmation sensor to be turned on when the workpiece is abutted. In some cases, the corresponding sensor may be determined manually.

  In this case, it is preferable that the result is displayed on the operation screen 9 after manual determination by the operator so that it can be confirmed (for example, corresponding to the lower portion of the operation screen 9 in FIG. 9).

  FIG. 10 shows a case where the drive mechanism of the contact confirmation sensor is a pressure sensor system.

As shown in FIG. 10A, for example, a gap G is formed between the workpiece contact portion C ₅ constituting the contact confirmation sensor S ₅ and the abutting surface 5A, and the air exposed to the gap G side is exposed. A pipe 14 is built in the abutting portion 5.

  The air pipe 14 communicates with the air source 11 via the flow control valve 12, and a pressure sensor 13 is connected to the air pipe 14.

  With this configuration, if an air flow rate corresponding to the illustrated pneumatic circuit is set, air normally escapes to the gap G side, so the pressure switch 13 is in the OFF state.

However, as shown in FIG. 10 (B), when abutted against the workpiece W to the workpiece abutting part C _5, since the gap G is eliminated, air is no longer escape, air piping 14 exhibits a high pressure, therefore the pressure The switch 13 is turned on.

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

(1) Operation until determining a contact confirmation sensor to be turned ON when a workpiece is abutted.
In step 101 of FIG. 11, product information J is input from the host NC device 23, and in step 102, bending order, mold, mold layout, D value, L value, workpiece position, back gauge position, and side gauge position are set. In step 103, the shape of the workpiece abutting portion is determined for each bending process (bending order), and in step 104, the contact confirmation sensor to be turned on when the workpiece is abutted is determined for each bending process.

  That is, when the CPU 24A detects that the product information J has been input from the host NC device 23 (FIG. 1), the bending order, mold, and mold layout described above are passed through the bending order / mold determining means 24D. Etc.

  Thereafter, the CPU 24A determines the shape of the abutting portion with respect to the back gauge of the workpiece for each bending process (bending order) based on the product information J via the contact confirmation sensor determining means 24E (process diagram). Based on the shape of the workpiece abutting portion and the abutting state with the back gauge abutting portion 5A (for example, FIG. 7), a contact confirmation sensor to be turned on at the time of workpiece abutment from a plurality of contact confirmation sensors To decide.

  The contact confirmation sensor determined in this way is stored in a database (FIG. 8) and stored in the storage means 24C (FIG. 1).

(2) Work positioning operation.
When the foot pedal 6 is turned on at step 105 in FIG. 11 (YES), the ram 1 is lowered at step 106 and stopped at the mute point. At step 107, the back gauge 7 and the side gauge 8 are set to predetermined positions. In step 108, the workpiece W is abutted. In step 109, it is determined whether or not the corresponding contact confirmation sensor is turned on.

  That is, when the CPU 24A detects that the foot pedal 6 is turned on when the operator S depresses the foot pedal 6 (FIG. 1), the CPU 24A operates the hydraulic cylinder 34 via the ram control means 24G. Is lowered and temporarily stopped at the mute point position, and in this state, the back gauge 7 and the side gauge 8 are positioned at predetermined positions via the back gauge / side gauge control means 24F.

  Thereby, the worker S inserts the workpiece W from between the punch P and the die D, and abuts the workpiece W against the back gauge 7 and the side gauge 8 positioned at the predetermined positions.

  As described above, if all the contact confirmation sensors determined via the contact confirmation sensor determination unit 24E are not turned ON (NO in step 109 in FIG. 11), the worker S backs the workpiece W again. When the workpiece W is positioned when it abuts against the gauge 7 and the side gauge 8 (returns to step 108 in FIG. 11) and all of the determined contact confirmation sensors are turned on (YES in step 109 in FIG. 11). It is considered.

(3) Bending operation.
When the foot pedal 6 is turned on in Step 110 of FIG. 11 (YES), the ram 1 is lowered in Step 111, bent in Step 112, and when a predetermined stroke is reached in Step 113 ( YES), all operations are terminated (END).

  That is, the CPU 24A (FIG. 1) searches the database stored in the storage means 24C (FIG. 8) to detect that all corresponding contact confirmation sensors are turned on, and then the operator S moves the foot pedal 6 , It is detected that the foot pedal 6 is turned on. In other words, the hydraulic pressure is again passed through the ram control means 24G on condition that all the contact confirmation sensors are turned on and the foot pedal 6 is turned on. The cylinder 34 is actuated to lower the ram 1 and when it is detected that the ram 1 has reached a predetermined stroke, it is considered that the bending process has been completed, and all operations are ended.

According to the present invention, by providing a plurality of contact confirmation sensors in one back gauge abutting portion, the present invention should be turned on when a workpiece is abutted based on the abutting state between the workpiece abutting portion and the back gauge abutting portion. The contact confirmation sensor is determined, and is used in a bending method and apparatus for bending a workpiece by driving a ram on condition that all of the determined contact confirmation sensors are turned on and the foot pedal is turned on. Regardless of the shape of the abutting part against the gauge, the occurrence of defective products can be prevented by accurately determining whether the work abutting part is in proper contact with the back gauge abutting part. Therefore, it is useful for improving the machining efficiency and reducing the burden on the operator. Specifically, it is applied not only to the descending press brake but also to the ascending press brake. In any 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. Stroke Y ₁ of the work abutting part constituting the contact confirmation sensor according to the present invention, showing the relationship between the stroke Y ₂ stroke larger lever. It is a figure explaining the function of the back gauge 7 and the side gauge 8 which comprise this invention. It is a figure which shows the contact state of the butting part of the workpiece | work W by this invention, and the butting part 5 of the back gauge 7. FIG. It is a figure which shows the relationship between each bending process by this invention, and the contact confirmation sensor which should be turned ON at the time of workpiece | work abutting. It is a figure which shows the other Example of this invention. It is a figure which shows the other example (pressure switch system) of the contact confirmation sensor by this invention. It is a flowchart for demonstrating operation | movement of this invention.

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 shaft 11 Air source 12 Flow control valve 13 Pressure switch 14 Air piping 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 25 Stretch 26 Abutment body 30 Side plate 32 Intermediate plate 33 Holding plate 34 Hydraulic cylinder D Die P Punch W Workpiece

Claims (7)

After determining the mold, mold layout, workpiece position, back gauge position, and the shape of the abutting portion of the workpiece against the back gauge for each bending process based on the product information, the workpiece abutting portion and the back Based on the contact state with the gauge abutting portion, a contact confirmation sensor to be turned ON when the workpiece is abutted is determined from a plurality of contact confirmation sensors provided in one back gauge abutting portion. A bending method characterized in that the workpiece is bent by driving the ram on condition that all the contact confirmation sensors are turned on and the foot pedal is turned on. After determining the contact confirmation sensor to be turned on when the workpiece is abutted, when the foot pedal is turned on, the ram is lowered and stopped at the mute point, and then the workpiece is abutted against the back gauge and the side gauge. The bending method according to claim 1, wherein when all of the determined contact confirmation sensors are turned on and the foot pedal is turned on, the workpiece is bent by lowering the ram. After determining the contact confirmation sensor to be turned on at the time of the workpiece abutting, the abutting confirmation sensor and the contact state between the workpiece abutting portion and the back gauge abutting portion are displayed on the operation screen, respectively. The bending method according to claim 1, wherein the ON / OFF state of the contact confirmation sensor can be confirmed on the operation screen while observing the contact state. 2. A plurality of contact confirmation sensors provided at the back gauge abutting portion are displayed on an operation screen, and the contact confirmation sensors to be turned on when a workpiece is abutted are specified on the operation screen. The bending method described. In bending machine,
A single back gauge abutting section is provided with a plurality of abutment confirmation sensors that confirm abutment with the workpiece. When the workpiece is abutted, all of the sensors specified automatically or manually within the corresponding contact confirmation sensor are turned on. A bending apparatus comprising control means for driving the ram on condition that the foot pedal is turned on. A plurality of contact confirmation sensors provided in one back gauge butting portion;
Based on the product information, for each bending process, a mold, a mold layout, a work position, a bending order for determining the position of the back gauge, a mold determining means, and the like,
Based on the product information, the shape of the abutting portion of the workpiece against the back gauge is determined for each bending process, and the plurality of abutting portions are determined based on the abutting state between the workpiece abutting portion and the back gauge abutting portion. A contact confirmation sensor determining means for determining a contact confirmation sensor to be turned on when the workpiece is abutted among the confirmation sensors;
A bending apparatus characterized by comprising a ram control means for driving a ram and bending a workpiece on condition that all of the determined contact confirmation sensors are ON and a foot pedal is ON. The abutment confirmation sensor includes a workpiece abutting portion with which the workpiece abuts, a stroke enlarging lever that enlarges the stroke of the workpiece abutting portion by a predetermined amount, and a push button that is pressed by the stroke enlarged by the stroke enlarging lever. The bending apparatus according to claim 6, wherein the bending apparatus is configured by a micro switch that is turned on when moved.

Images