KR101753827B1 - Bending work control method for bending machine - Google Patents

Abstract

A bending machine is provided to prevent the operation from being interrupted due to a sensor failure by forcibly advancing the next operation based on time if the operation state is not detected due to abnormality of the specific sensor in a state where a plurality of sensors are provided for automatic operation A method of controlling a bending operation, the method comprising: receiving material information to be bent; Detecting a material when an automatic mode is selected and a job start command is input; Supplying the material when the material is normally detected; Sensing a state of a work process or a position using a sensor for each process while sequentially performing a predetermined process in an automatic mode; Calculating a working time or a working time for each position if a sensor detection value does not occur in a specific process or position as a result of sensing a working process or a position-based condition; Determining whether the sensor is abnormal based on the calculated time, and controlling the bender to control the next operation if it is determined that the sensor is abnormal.

Description

Technical Field [0001] The present invention relates to a bending machine,

The present invention relates to a method of controlling a bending operation of a bending machine and, more particularly, in a state where a plurality of sensors are provided for automatic operation, if the operation state is not detected due to a specific sensor, To a bending operation control method of a bending machine that can prevent a job from being interrupted due to the bending operation of the bending machine.

In general, various types of fluid transfer pipes installed in a narrow space such as an engine room of an automobile are often bent in many directions rather than a straight line in order to avoid interference with peripheral components.

Therefore, the pipe is bent in multiple directions by using a bending machine for bending the pipe in mass production.

The bending machine performs a bending operation in a manual mode in which an operator intervenes in the middle of the operation and performs a bending operation, and an automatic mode in which a bending operation is performed while automatically detecting a work state using a plurality of sensors.

The method of performing the bending operation by the automatic mode includes a plurality of sensors installed, for example, a material (pipe) supply cylinder advance sensor, a material supply cylinder reverse sensor, a first reference sort cylinder advance sensor, a first reference sort cylinder The operation of the bending machine is controlled using the detection information of the reverse sensor, the second reference alignment cylinder advance sensor, the second reference alignment cylinder reverse sensor, the finger close detection sensor, the finger open detection sensor, and the finger rotation detection sensor.

If the operation state in the process is not detected due to abnormality of the specific sensor during the operation in the automatic mode, the operation is immediately stopped at the process position.

On the other hand, a conventional technique for a device for bending a pipe in mass production is disclosed in Patent Documents 1 to 2 below.

In the prior art disclosed in Patent Document 1, a rotary vice having a fixed vise fixed to one side thereof and a rotary vise rotating along a rotation guide body is provided on the other side, and a driving unit having a cylinder connected to the chain is provided. And a position sensing sensor for sensing the position of the moving rod on a slide bar protruding outwardly and formed along the chain driving direction. Accordingly, by automatically bending the pipe at the set bending angle, the work can be performed more quickly and accurately, thereby improving efficiency and productivity.

Also, the prior art disclosed in Patent Document 2 includes a support having a pressing means for supporting and bending a tube; Mandrel means inserted into the inner space of the tube to limit deformation of the inner circumferential surface; Driving means for reciprocally driving said mandrel means using a driving cylinder; Sensor means for sensing irregular drive of said mandrel means; And a control unit connected to the sensor unit to discriminate occurrence of wrinkles in the curved area and to control driving of the driving unit. Accordingly, wrinkles generated in the curved surface area of the tube can be checked in real time during the bending process, thereby improving the working efficiency.

Korea Registered Utility Model No. 0236024 (published Oct. 8, 2001) (name of design: automatic pipe bending device) Korean Patent Laid-Open No. 10-2011-0064522 (titled "Bending Device for Tubes")

However, since a conventional bending machine as described above has a plurality of sensors installed therein and performs the process automatically based on the detected values of the sensors, if the sensor can not detect the state due to the sensor abnormality, . In this case, there is no problem even if the actual operation is continued when the bending machine is not the obstacle but merely the sensor abnormality. However, since the conventional technology and the conventional bending machine stop the operation unconditionally, there is a drawback in that the operation efficiency is lowered due to the delay of the operation.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the above problems occurring in the prior art, and it is an object of the present invention to provide a method and apparatus for detecting an operation state of a plurality of sensors, The present invention provides a method of controlling a bending operation of a bending machine, which can prevent an operation from being interrupted due to a sensor failure by forcibly advancing an operation.

Another object of the present invention is to provide a method of controlling a bending operation of a bending machine in which a subsequent process is forcibly proceeded when a bending machine is not obstructed and merely a sensor error occurs, .

In order to accomplish the above object, a bending operation control method of a bending machine according to the present invention includes the steps of: (a) receiving material information for a bending operation; (b) detecting the material when the automatic mode is selected and a job start command is input; (c) if the material is normally detected as a result of the detecting in the step (b), supplying the material using the material supply device; (d) sensing the state of the work process or the position by using the sensor in each process while sequentially performing the predetermined process in the automatic mode after the material supply; (e) calculating a working time or a working time for each position if the sensor detection value is not generated at a specific process or position as a result of sensing the working process or the positional status at the step (d); (f) determining whether the sensor is abnormal based on the time calculated in the step (e), and controlling the next operation to be forced if it is determined that the sensor is abnormal.

In the step (a), at least one of material and weight information of the material is inputted as the material information.

In step (d), the upstream / downstream detection of the material supply cylinder, the forward / reverse detection of the primary reference sorting cylinder, the forward / reverse detection of the secondary reference sorting cylinder, the finger closing / opening cylinder detection, And detecting it by position.

In the step (e), the corresponding work process time or work time is calculated based on the weight of the inputted work information.

In the step (f), if the sensor value of the next step is not detected until the time calculated in the step (e) after the completion of the previous step is completed, it is judged that the sensor of the process or the position is abnormal, So as to prevent a work delay due to a sensor abnormality.

In the step (f), when it is determined that the sensor is abnormal, the abnormal state of the sensor is displayed.

According to the present invention, in a state where a plurality of sensors are provided for an automatic operation, if an operation state is not detected due to a specific sensor, a next operation is forcibly advanced on a time basis, There is an advantage.

Further, according to the present invention, when the sensor is not a failure of a bending machine but merely a sensor abnormality, the following process is forcibly performed, and the operation is delayed due to the sensor failure, thereby preventing the work efficiency from being lowered.

1 is a plan view of a bending machine to which the present invention is applied,
FIGS. 2A and 2B are flowcharts showing a bending operation control method of a bending machine according to the present invention;

Hereinafter, a bending operation control method of a bending machine according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a plan view of a bending machine to which a bending operation control method of a bending machine according to a preferred embodiment of the present invention is applied.

Here, the 'front end' and the 'front' mean the left side of the main body 20, and the 'rear end' and the 'rear' mean the right side of the main body 20 do.

A chuck 22 for supporting the pipe 10 and a press unit 24 are provided on the main body 20 so as to be linearly movable. The chuck 22 linearly moves in the longitudinal direction (transverse direction) in the left region of the main body 20 and the press unit 24 linearly moves in the longitudinal direction and the width direction do. The press unit 24 comprises opposed wiper dies 26 and press dies 28, each wrapping and supporting the pipe 10 using a semi-circular cross section.

The bending unit 30 has a roller mold 31 and a clamp die 32 adjacent to the press die 24 of the main body 20 and the mold 31 32 are rotated to form the bending portion 12. The roller mold 31 is rotatably provided adjacent to the wiper die 26 of the press unit 24 and the clamp die 32 is installed so as to be able to linearly move and rotate against the roller mold 31. The mandrel 35 linearly moves so as to be able to move into and out of the tip end portion of the pipe 10. The roller mold 31, the clamp die 32 and the mandrel 35 integrally cooperate with each other with reference to the same center of rotation to form a bending portion 12 on the pipe 10.

Further, when the worker loads the pipe 10 and hits the chuck 22, the press unit 24 operates to support the pipe 10. [ In this state, the tip end position of the pipe 10 is detected before bending is started. The relative distance between the center of the roller mold 31 and the leading end portion becomes important data because the center of the roller metal mold 31 is rotated when the pipe 10 is bent. This distance must be accurately maintained before bending to improve the accuracy of the tip length after bending.

Further, the controller 50 moves the chuck 22 and the mandrel 35 to the set position in response to the signal input of the sensing means. The controller 50 includes an input button 52 for manual input of an operator, a display 55 for displaying a control state, a sensor abnormal state, and a sensor in which an abnormal state has occurred, and a control circuit (not shown) . By applying a touch screen to the display 55, the input button 52 can be omitted or the number of buttons can be reduced.

At this time, the controller 50 determines the position of the leading end with respect to the roller mold 31, moves the chuck 22 to stop at the standby position, inserts the mandrel 35 into the set position, 22 while applying a pressing force to the mandrel 35. The operator inputs data relating to the bending to the controller 50 in advance, and the input data includes the distance between the center of the roller mold 31 and the leading end. The position of the distal end portion is determined while the pipe 10 moves in the lateral direction of the chuck 22 while the pipe 10 is held in the chuck 22 of the main body 20. [ Then, the mandrel 35 is moved in the lateral direction to stop at the correct insertion position. Then, the roller mold 31, the clamp die 32, and the mandrel 35 are simultaneously rotated while moving the chuck 22 in the lateral direction to apply the pressing force. Of course, during bending, the pipe 10 is supported by the outer ear pad 26 and the press die 28.

Particularly, a method of pressing the chuck 22 at the rear end of the bending machine and supporting it at the tip with the mandrel 35 is very effective in terms of preventing the bending portion 12 from cracking or breaking.

Meanwhile, when the bending operation is performed in the automatic mode, the controller 50 senses the operation state and the position of the material or the cylinders through the plurality of sensors provided for each process or work position during the bending operation, To control the bending operation automatically.

Hereinafter, a method of automatically controlling the bending operation of the bending machine will be described.

FIG. 2 is a flowchart illustrating a method of controlling a bending operation of a bending machine according to the present invention, and FIG. 1 illustrates a process of controlling a bending operation by software in the controller 50.

A bending operation control method of a bending machine according to the present invention includes the steps of: (a) receiving material information for bending operation (S101); (b) detecting the material when the automatic mode is selected and a job start command is input (S102 to S104); (c) a step (S105) of supplying a material using the material supply apparatus when the material is normally detected as a result of the detecting in the step (b); (d) S113 to S130 (S106 to S108) of sensing a state of each work process or position by using a sensor for each process while sequentially performing the predetermined processes in the automatic mode after the material is supplied; (S109) calculating a working time or a working time for each position if the sensor detection value is not generated at a specific process or position as a result of detecting the working process or the positional status at the step (d); (f) determining whether there is an abnormality in the sensor based on the time calculated in the step (e), and controlling the next operation to be forced if it is determined that the sensor is abnormal (S110 to S112, S131) .

The method of controlling the bending operation of the bending machine according to the preferred embodiment of the present invention will be described in detail as follows.

First, the controller 50 receives the material information to be bent in step S101. Here, the material information to be bent may include the material and the weight of the material. When bending in a real bending machine, the moving speed varies depending on the weight of the material. Here, the movement speed affects the time for moving from the first step to the second step as a result, and the processing time for each process may vary depending on the weight of the material.

After inputting the material information, the operator selects a mode for whether to proceed the bending operation automatically or manually. The present invention applies only to the automatic mode.

As a result of checking the mode in step S102, if the user inputs a job start command in step S103, it is confirmed whether a material is detected in step S104. Here, the material is preferably detected using a material detection sensor.

As a result of the material detection, if the material is not detected, the operation can not be performed. Therefore, the bending operation is not performed and the operation moves to the initial stage. Otherwise, if the material is detected, the process moves to step S105 to supply the material.

When the supply of the material is started, in step S106, it is detected whether the material supply cylinder advances normally by using the advance sensor of the material supply cylinder. As a result of the confirmation, if the advance of the material supply cylinder is not detected, the operation is immediately stopped. However, in the present invention, it is determined that the material supply cylinder advance sensor is in a state of no obstacle of the bending machine, Calculate the time. Here, it is desirable to calculate the time of the material supply process based on the weight of the material initially input. In step S109, it is determined whether the calculated time has passed. If it is assumed that the calculation time is 4 seconds, it is judged whether the elapsed time has passed four seconds from the start of the material supply process as the previous process. As a result of the determination, if four seconds have elapsed from the start of the material supply process, the process proceeds to step S111, where the abnormality of the material supply cylinder advance sensor is determined and displayed on the display 55. Next, in step S112, the controller 50 does not stop the bending operation but forcibly proceeds to the next step. That is, the time from the supply of the material to the advancement of the material supply cylinder is 4 seconds. If the advance detection signal of the material supply cylinder is not generated by the material supply cylinder advance sensor even after 4 seconds have elapsed, At the last point, you are automatically controlled to proceed to the next process. Thus, when a sensor abnormality occurs simply, the operation is forced to proceed to the next process without interrupting the operation immediately, thereby preventing the work efficiency from being lowered due to the interruption of the operation occurring when the sensor abnormality occurs.

Likewise, if it is determined in step S106 that the advancement of the material supply cylinder is normally detected, the process proceeds to step S107 to proceed to the material supply / retreat step, which is the next step. Next, in step S108, it is detected whether the material supply cylinder has normally been reversed by using the reverse sensor of the material supply cylinder. As a result of this confirmation, if the backward movement of the material supply cylinder is not detected, the operation is immediately stopped. However, in the present invention, it is determined that the material supply cylinder backward sensor is in a state of no obstacle of the bending machine, Calculate the time. Here, it is desirable to calculate the time of the material supply retreat process based on the weight of the material initially input. Then, if the sensor abnormality merely occurs in steps S109 to S112, the operation is forced to proceed to the next process without interrupting the operation immediately, thereby preventing the operation efficiency from being lowered due to the interruption of the operation occurring when the sensor abnormality occurs .

If it is determined in step S108 that the backward movement of the workpiece feeding cylinder is normally detected, the process proceeds to step S113 to advance the first reference alignment cylinder, which is the next step. Then, in step S114, the first reference sorting cylinder battery detecting sensor is used to detect whether the first reference sorting cylinder has normally advanced. As a result of the check, if the advancement of the first reference sorting cylinder is not detected, the operation is immediately stopped. However, in the present invention, it is determined that the first reference sorting cylinder forwarding sensor is a failure in the state where there is no obstacle of the bending machine, Calculate the time to work or move. Here, it is preferable to calculate the time of the first reference sorting cylinder advancement process based on the weight of the initially input material. Then, if the sensor abnormality merely occurs in steps S109 to S112, the operation is forced to proceed to the next process without interrupting the operation immediately, thereby preventing the operation efficiency from being lowered due to the interruption of the operation occurring when the sensor abnormality occurs .

Likewise, if it is determined in step S114 that the advancement of the first reference sorting cylinder is normally detected, the process proceeds to step S115 and proceeds to the next step of the second reference sorting cylinder advancing process. Next, in step S116, it is detected whether the secondary reference sorting cylinder is normally advanced by using the forward reference sensor of the secondary reference sorting cylinder. As a result of the confirmation, if the forward movement of the second reference sorting cylinder is not detected, the operation is immediately terminated. However, in the present invention, it is determined that the second reference sorting cylinder forwarding sensor has failed in the state where there is no obstacle of the bending machine, Calculate the time to work or move. Here, it is desirable to calculate the time of the second reference sorting cylinder advancement process based on the weight of the initially input material. Then, if the sensor abnormality merely occurs in steps S109 to S112, the operation is forced to proceed to the next process without interrupting the operation immediately, thereby preventing the operation efficiency from being lowered due to the interruption of the operation occurring when the sensor abnormality occurs .

If it is determined in step S116 that the advancement of the second reference sorting cylinder is normally detected, the process proceeds to step S117 and the finger closing cylinder drive process, which is the next step, proceeds. Then, in step S118, it is confirmed whether a finger closing is detected by using a finger closing cylinder detecting sensor. If the finger closure is not detected, the operation is immediately stopped. However, in the present invention, it is determined that the finger closing cylinder detection sensor is a failure in the state where there is no obstacle of the bending machine, and the operation or movement time is calculated do. Here, it is desirable to calculate the time of the finger closing process based on the weight of the input material initially. Then, if the sensor abnormality merely occurs in steps S109 to S112, the operation is forced to proceed to the next process without interrupting the operation immediately, thereby preventing the operation efficiency from being lowered due to the interruption of the operation occurring when the sensor abnormality occurs .

If it is determined in step S118 that the finger closure is normally detected, the process proceeds to step S119 and proceeds to the next step of the second reference sorting cylinder backward process. Next, in step S120, it is detected whether the secondary reference sorting cylinder has been normally reversed by using the reverse detection sensor of the secondary reference sorting cylinder. If it is determined that the second reference sorting cylinder backward sensor is not detected, it is determined that the second reference sorting cylinder backward sensor has failed in the state where the bending machine is not obstructed, Calculate the time to work or move. Here, it is desirable to calculate the time of the second reference alignment cylinder backward process based on the weight of the initially input material. Then, if the sensor abnormality merely occurs in steps S109 to S112, the operation is forced to proceed to the next process without interrupting the operation immediately, thereby preventing the operation efficiency from being lowered due to the interruption of the operation occurring when the sensor abnormality occurs .

If it is determined in step S120 that the backward movement of the second reference sorting cylinder is normally detected, the process proceeds to step S121 to proceed with the backward movement of the first reference sorting cylinder, which is the next step. Then, in step S122, the first reference sorting cylinder's reverse sensor is used to detect whether the first reference sorting cylinder is normally backward. As a result, if the backward movement of the first reference sorting cylinder is not detected, the operation is immediately stopped. However, in the present invention, it is determined that the first reference sorting cylinder backward sensor has failed in the state where there is no obstacle of the bending machine, Calculate the time to work or move. Here, it is preferable to calculate the time of the first reference sorting cylinder backward process based on the weight of the initially input material. Then, if the sensor abnormality merely occurs in steps S109 to S112, the operation is forced to proceed to the next process without interrupting the operation immediately, thereby preventing the operation efficiency from being lowered due to the interruption of the operation occurring when the sensor abnormality occurs .

If it is determined in step S122 that the first reference alignment cylinder backward movement is normally detected, the flow advances to step S123 to request the supply of the CNC material in the next step. Then, the process proceeds to step S124 to proceed with the finger rotation process. In step S125, it is determined whether finger rotation (180 °) is normally performed with the finger rotation detection sensor. If it is determined that the finger rotation is not detected, the operation is immediately stopped. However, in the present invention, it is determined that the finger rotation sensor has failed in a state where there is no obstacle of the bending machine, . Here, it is preferable to calculate the finger rotation time based on the weight of the input material at the initial time. Then, if the sensor abnormality merely occurs in steps S109 to S112, the operation is forced to proceed to the next process without interrupting the operation immediately, thereby preventing the operation efficiency from being lowered due to the interruption of the operation occurring when the sensor abnormality occurs .

If it is determined in step S125 that the finger rotation is normally detected, the process proceeds to step S126 and the CNC retreat process is performed. Then, in step S127, the finger opening cylinder driving process is performed. In step S128, a finger opening sensor is used to detect whether the finger is normally opened. If it is determined that the finger opening is not detected, the operation is immediately stopped. However, in the present invention, it is determined that the finger opening detection sensor is a failure in a state where there is no obstacle of the bending machine, . Here, it is desirable to calculate the time of the finger opening process based on the weight of the input material initially. Then, if the sensor abnormality merely occurs in steps S109 to S112, the operation is forced to proceed to the next process without interrupting the operation immediately, thereby preventing the operation efficiency from being lowered due to the interruption of the operation occurring when the sensor abnormality occurs .

Finally, if it is detected in step S128 that the finger is normally opened, the process proceeds to step S129, and the process of returning the finger, which is the next process, to the original position (0 DEG) is performed. Then, in step S130, the finger rotation detection sensor is used to detect whether the finger has returned to its original position normally. If it is determined that the finger return is not detected, it is determined that there is an interface abnormality with the CNC. In the present invention, it is determined that there is no obstacle in the bending machine, Calculate the time to work or move. Here, it is preferable to calculate the time of the finger return process based on the weight of the input material initially. Then, if the sensor abnormality merely occurs in steps S109 to S112, the operation is forced to proceed to the next process without interrupting the operation immediately, thereby preventing the operation efficiency from being lowered due to the interruption of the operation occurring when the sensor abnormality occurs .

If it is determined in step S130 that the finger has been normally returned, the process proceeds to step S131 where it is determined that the CNC has been normally retracted and the automatic bending operation for one cycle is terminated. Then, the process proceeds to step S106, and the following steps are performed.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It is obvious to those who have.

10: pipe
20:
22: Chuck
24: Press unit
30: bending unit
31: Roller mold
32: Clamp die
35: Mandrel
50:
52: Input Button
55: Display

Claims (6)

A method for automatically controlling a bending operation of a bending machine,
(a) receiving material information for a bending operation in a controller for controlling a bending operation of the bending machine;
(b) detecting the material when the automatic mode is selected and a job start command is input;
(c) if the material is normally detected as a result of the detecting in the step (b), supplying the material using the material supply device;
(d) sensing the state of the work process or the position by using the sensor in each process while sequentially performing the predetermined process in the automatic mode after the material supply;
(e) calculating a working time or a working time for each position if the sensor detection value is not generated at a specific process or position as a result of sensing the working process or the positional status at the step (d); And
(f) determining whether the sensor is abnormal based on the time calculated in the step (e), and if it is determined that the sensor is abnormal, controlling the bending machine to bend the bending machine Work control method.
The method as set forth in claim 1, wherein the step (a) receives at least one of material and weight information as material information.
The method of claim 1, wherein the step (d) includes a step of detecting a material supply cylinder forward / backward detection, a primary reference sorting cylinder forward / backward detection, a secondary reference sorting cylinder forward / backward detection, a finger closing / opening cylinder detection, Wherein the bending operation of the bending machine is detected in a state of a work process or a position.
The method according to claim 1, wherein the step (e) calculates a working time according to the weight of the inputted material information or a working time according to the position.
The method according to claim 1, wherein, in the step (f), if the sensor value of the next step is not detected until the time calculated in the step (e) after the completion of the previous step is detected, Wherein the control unit controls the next operation to be forced so as to prevent a job delay due to a sensor abnormality.
The method according to claim 5, wherein the step (f) indicates an abnormal state of the sensor when it is determined that the sensor is abnormal.

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