JP5525849B2 - Safe operation method of plate processing machine with numerical controller - Google Patents

Description

  The present invention relates to a safe operation method for a plate material processing machine with a numerical control device.

  In a punch press with a numerical controller, which is a kind of plate material processing machine, when processing a workpiece made of a plate material having a dimension longer than the processing range in the X-axis direction of this punch press machine, by using an automatic workpiece gripping function A workpiece exceeding the machining range in the X-axis direction can be machined (Patent Document 1).

  However, when performing processing using the above-mentioned automatic workpiece gripping function with a so-called single-unit machine that does not have an automatic workpiece feeding / unloading device, auxiliary tables are installed before and after the table of the plate material processing machine. In many cases, the auxiliary table is not installed on the front side because it becomes an obstacle when supplying the workpiece. In addition, when the amount exceeding the processing range that can be processed by a single clamp is relatively small, the auxiliary table is often hardly installed.

  In machining using the above-described automatic workpiece gripping function, even if the workpiece is in a state of protruding from the table of the plate material processing machine, the machining is usually continued as it is.

  Note that this automatic workpiece gripping function is often used as a means for escaping the workpiece clamp when processing the workpiece in the vicinity of the workpiece clamp.

Japanese Patent Publication No. 7-24879

  As described above, since the workpiece protrudes from the table of the plate material processing machine in the X-axis direction and also moves in the Y-axis direction in a protruding state, there are many cases where work is performed near the punch press machine in a small factory. The user is unaware that the change has been performed, and the worker is in danger of being injured by touching the workpiece.

  The present invention has been made in order to solve the above-described problems, and an object of the present invention is to perform a work in a normal processing and a processing with repositioning in a plate material processing machine with a numerical control device. The overhang from the work table is automatically checked from the machining program and an alarm is displayed. At the same time, the axis movement of the plate positioning device is stopped, and the operator issues a restart command after confirming the alarm. Machining can be resumed from time to time, and overhang (protrusion) is automatically checked from the machining program when returning to the origin after machining is completed, and at the same time, the axis movement of the plate material positioning device is stopped. Safety of plate processing machine with numerical controller that can perform safe operation by double operation monitoring system To provide a driving method.

As a means for solving the above-mentioned problem, the safe operation method for a plate material processing machine with a numerical control device according to claim 1 is a processing method for a plate material processing machine with a numerical control device provided with a plate material positioning device having an automatic workpiece gripping mechanism. The workpiece moved and positioned at the machining command value from the workpiece size data obtained from the workpiece size information added to the program and the coordinate data obtained from the machining command value of the machining program is the workpiece of the plate material processing machine. Whether or not to overhang from the table is calculated in the numerical control device, and if it is overhanging , or is set at the origin position of the plate material positioning device from the coordinate data obtained from the gripping change command value in the machining program The gripping change direction of the workpiece and the moving distance of the gripping are obtained, and Alarm display switch for enabling / disabling whether or not to display an alarm indicating the overhang on the display device when the numerical control device calculates the amount of overhang from the work table. If this alarm display switch is valid, the alarm is displayed on the display device, and at the same time, the axis movement of the plate material positioning device is stopped, and a restart command is issued after the operator confirms the alarm. When done, the machining at the machining command value is resumed at the axis movement speed of the plate material positioning device set in the automatic axis movement speed setting dialog box, or the workpiece is moved to the next machining command coordinate value and machined. If the alarm display switch is disabled, an alarm is displayed on the display device. Without and it is an gist to continue the processing without stopping the axial movement of the plate positioning device.

The plate material processing machine with a numerical control device according to claim 2 is the plate material processing machine with the numerical control device according to claim 1, wherein the workpiece program is executed a plurality of times in the processing program. Whether or not to display an alarm indicating an overhang on the display device after calculating the gripping direction of the workpiece and the moving distance of the gripping by the numerical control device each time the gripping is performed. The gist is to check the state of the alarm display switch that sets the valid or invalid state .

According to a third aspect of the present invention, there is provided a safe operation method for a plate material processing machine with a numerical control device according to the second aspect, wherein the movement distance of the gripping change after execution of the multiple gripping changes is integrated in the plate material processing machine with the numerical control device according to the second aspect. Then, based on the accumulated movement distance, it is determined whether the gripping change direction is the initial position (± 0) of the machining start, or the positive or negative direction with respect to the origin, and the initial position (± 0) of the machining start is determined. ) Or in the positive direction, the origin return of the plate positioning device is executed to finish the processing, and in the negative direction, whether to display an alarm notifying overhang on the display device is set to be valid or invalid. Check the status of the alarm display switch. If the alarm display switch is valid, the alarm is displayed on the display device, and at the same time the axis movement of the plate material positioning device is stopped, and the operator confirms the alarm. When the restart command is issued later, the plate material positioning device is returned to the origin to finish the machining, and when the alarm display switch is invalid, the axis movement of the plate material positioning device is not stopped. The gist is to execute the return to origin and finish the machining .

  According to the present invention, an overhang (protrusion) from a work table of a workpiece during normal machining and machining with repositioning (repositioning) is automatically checked from a machining program and displayed as an alarm. The axis movement of the positioning device can be stopped, machining can be resumed when the operator gives a restart command after confirming the alarm, and overhang (protruding) is also possible when returning to the origin after machining. It is possible to perform safe operation by a double operation monitoring system that automatically checks from the program and displays an alarm, and at the same time stops the axis movement of the plate material positioning device.

The flowchart explaining the safe driving | running method at the time of the normal process in the safe driving | running method of the board | plate material processing machine with a numerical control apparatus which concerns on this invention. The flowchart of the safe driving | running method in the case of the process which has a re-handling in the safe driving | running method of the board | plate material processing machine with a numerical control apparatus which concerns on this invention. The flowchart of the safe driving | running method at the time of the origin return following the completion of the process in the safe driving | running method of the board | plate material processing machine with a numerical control apparatus which concerns on this invention. FIG. 4A is a diagram in which a workpiece is set at the origin, and FIG. 4B is a diagram illustrating an overhang state during machining (cross section AA in FIG. 7). FIG. 5A shows a state of processing when re-holding, FIG. 5A shows an overhang state when re-holding, and FIG. 5B shows a state of overhang when re-processing after re-holding (cross section AA in FIG. 7). The figure which shows the overhang state in case the amount of re-holding is a "-" direction at the time of the origin return which continues after completion of a process (AA cross section of FIG. 7). The front view explaining the outline | summary of a well-known turret punch press with a numerical control apparatus.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 7 shows a front view of a known turret punch press to which the safe operation method of the plate material processing machine with a numerical controller according to the present invention can be applied, and the outline thereof will be described below.

  The turret punch press 1 includes a plate material positioning device 9 including an X-axis carriage 5 and a Y-axis carriage 7 each having a plurality of work clamping devices 3. The Y-axis carriage 7 is provided on the lower frame 11b of the gate-shaped main body frame 11 so as to be movable and positionable in the Y-axis direction. The X-axis carriage 5 is arranged on the Y-axis carriage 7 so as to be orthogonal to the Y-axis. It can be moved and positioned in the direction.

  The upper frame 11u of the portal frame 11 is provided with an upper turret 13 mounted with a plurality of upper molds (not shown) so as to be freely rotatable, and the lower frame 11b has an upper portion below the upper turret 13. A lower turret (not shown) that rotates in synchronization with the turret 13 is provided so as to be rotatable and positionable, and a plurality of lower dies (not shown) corresponding to the upper dies are mounted on the lower turret.

  The upper frame 11u is provided with a pair of work fixing means 15 including a cylinder or the like for pressing and fixing the work W on the work table when the automatic work gripping is performed. Since the operation of the turret punch press is well-known in the known literature, description thereof is omitted.

1 to 3 are flowcharts of a safe operation method of a plate material processing machine with a numerical controller according to the present invention.

  A safe driving method during normal machining will be described with reference to FIG.

  In step S1, the X dimension of the workpiece, X = 2500, is read from the machining program, for example, from the program “G06 X2500 Y1270” for setting the workpiece dimensions, and stored in a storage device (not shown). Further, in step S2, the maximum dimension in the X-axis direction of the workpiece that can be processed by one clamping (without gripping), that is, one clamp movement amount (a machine-dependent eigenvalue, X = 2000 in this explanation example) Is stored in a storage device (not shown).

In the next step S3, the X coordinate of the machining position, X = 400, is read from a machining program, for example, “G90 X400 Y300 T110”, and the X movement amount of the clamp at this time is X = 1600. The X dimension A _X of the work in the region where machining cannot be performed is set, and the X dimension of the work table is T _X (an eigenvalue depending on the machine, which is half of the X dimension of the table of the turret punch press 1 and is almost equal to the movement amount of one clamp. Since this is the same, in this explanation example, when T _X = 2000), the following (Equation 1) and (Equation 2) are obtained by calculation in the numerical control device (not shown). If satisfied, it is determined that the work overhangs from the work table (step S4).

A _X = Workpiece X dimension-1Clamp movement amount (Formula 1)

T _X <A _X + X movement amount (Formula 2)

When X dimension of the work is X = 2500 is, A _X from equation (1), and A _X = 2500-2000 = 500. Therefore, (Expression 2) becomes T _X = 2000 <500 + 1600, and it is determined that the workpiece is overhanging from the work table (step S4).

  When the work overhangs from the work table (step S5A), an alarm notifying that the work is overhanging is displayed on a display device (not shown), and at the same time, the axis movement of the plate material positioning device is stopped (step S6).

  When the operator confirms the alarm display and issues a restart command after confirmation (step S7), the operator moves to the coordinates specified by the machining command value “X400 Y300” and resumes machining (steps S8 and S9). ).

  The restart command can be commanded from an operation panel (not shown) provided at a position separated from the work table, and can be automatically switched to a speed at which the axis moving speed at the time of the restart command is set.

  After the machining command value “X400 Y300” in step S8, it is determined whether or not there is a next machining command value (step S10). If there is no next machining command value, a repositioning command (replacement command) is continued. ) Is determined (step S11).

  If there is a repositioning command, the process moves to the entrance “A” in the flowchart shown in FIG. Further, when there is no repositioning command (replacement command), it moves to the entrance “B” of the flowchart shown in FIG. 3 described later.

  If it is determined in step S4 that there is no overhang (step S5B), the process proceeds to step S8, and the program cycle after step S8 is executed.

  FIGS. 4A and 4B show the machining status by the above-described safe operation method during normal machining. For example, the X dimension of the workpiece is X = 2500 (mm), and the clamp is performed once (without gripping). ) Is X = 2000 (mm) and the X coordinate of the machining position is X = 400 (mm), the X movement amount of the clamp at this time is X = 1600. (Mm), indicating that the work W overhangs by 100 (mm) on the rear side of the work table (upper side in FIG. 4) (see FIG. 4b).

  Next, a safe driving method in the case of processing with repositioning will be described with reference to FIG.

  First, from the machining program, for example, the X dimension of the workpiece, X = 2500, is read from a program “G06 X2500 Y1270” for setting the workpiece dimension, and stored in a storage device (not shown) (step S12).

  In step S13, the maximum dimension in the X-axis direction of the workpiece that can be processed by one clamping (without gripping), that is, one clamp movement amount (an eigenvalue depending on the machine. In this example, X = 2000. ) Is stored in a storage device (not shown).

  In step S14, a repositioning command value of the machining program, for example, “G27 X-500” is read, and the gripping change direction and the gripping amount are stored in the storage device (step S15). In the case of this example, the re-gripping direction is “−”, and the re-gripping amount is “500”.

Next, it is determined whether or not this re-holding is the first time (step S16). If it is the first time, the amount of overhang and the direction of the work are determined (step S17A).
In the above-described example of the repositioning command value, since the 500 mm clamp moves in the “−” direction, it is determined that the workpiece overhangs by 500 mm at the maximum on the front side of the work table.

  Next, the state of the alarm display switch that enables or disables the display of the alarm indicating the overhang on the display device is checked (step S18). The axis movement of the positioning device is stopped (step S19A).

  After the operator confirms the above-mentioned alarm, a restart command is issued, and if necessary, the axis movement speed of the plate material positioning device at the time of restart is set by an axis movement speed automatic setting dialog box (not shown). (Step S20), the workpiece is moved to the next machining command coordinate value and machining is performed (Step S21).

  It is determined whether or not the next machining program of step S21 is a repositioning command based on whether or not the command value includes “G27” (step S22). If the machining program is a normal machining command that is not a repositioning command, Return to step S21.

  In the loop of step S21 and step S22, the machining program is executed until step S22 becomes a repositioning command. If step S22 is a repositioning command, the process exits this loop and proceeds to the next step S22.

  In step S23, after the repositioning command in step S22, it is determined whether or not there is a machining completion command, that is, an origin return command “G50”, and there is a machining completion command, that is, an origin return command “G50”. In this case, the process moves to the entrance “B” shown in the flowchart of FIG. 3 described later.

  If there is no machining completion command (origin return command “G50”) after the repositioning command in step S23, the process returns to step S14, and the command between step S14 and step S23 is executed.

  If it is determined in step 16 that the re-holding is not the first time, the direction of re-holding performed up to the previous time, the current direction and the amount, and the overhang amount and direction are added. (Step S17B), and the state of the alarm display switch for setting the alarm display to be valid or invalid is checked (step S18). If this is valid, step S19A and subsequent steps are executed.

  If it is invalid, the platen positioning device is moved to the next machining command coordinate without displaying the alarm (step S21), and thereafter the machining program is executed until the machining completion command is issued.

  FIG. 5A and FIG. 5B show the machining state by the safe driving method in the case of machining with repositioning (repositioning), where the grasping direction is the negative direction of the X axis direction and the amount of reshuffling is In the case of 500 (mm), the workpiece W overhangs up to 500 (mm) on the front side of the work table (upper side in FIG. 5) when machining is resumed after gripping (FIG. 5). 5b).

FIG. 3 illustrates a safe driving method at the time of returning to the origin following the completion of machining.
In step S24 following the entrance “B”, after the repositioning command (step S22), the processing completion command, that is, the home position return command G50 (step S23) and the gripping direction and gripping amount stored so far. It is determined whether or not the accumulated direction and the amount of gripping have been returned to the state at the start of machining when gripping is performed a plurality of times.

  In other words, when it is determined whether the machining start state (the gripping change direction is ± 0), “+” direction, or “−” direction, and the gripping change direction is ± 0 or “+” direction In this case, since the workpiece does not overhang to the origin side even if the origin return is performed, the origin return is executed to finish the machining (steps S24A and S27).

  In step S24, if the stored gripping change direction is the “−” direction with respect to the state at the start of machining, performing the return to origin may cause the workpiece to overhang to the origin side, which is dangerous. The state of the display switch is checked (step S24B). If the alarm display switch is valid, for example, an alarm such as “danger because the workpiece protrudes from the front side” is displayed, and at the same time the axis movement of the plate material positioning device is performed. Stop (step S25A).

  When the operator confirms the above-described alarm and issues a restart command from the operation panel provided at a position separated from the work table, the origin return is executed and the machining is terminated (steps S26 and S27).

  When the state of the alarm display switch is invalid, the origin return (step S25B) is executed without stopping the axis movement of the plate material positioning device, and the machining is finished (step S27).

    FIGS. 6A and 6B show the machining status by the safe operation method at the time of returning to the origin following the completion of machining. The stored gripping change direction is the “−” direction with respect to the state at the start of machining. This shows that the workpiece overhangs toward the origin when returning to the origin in a certain case (see FIG. 6b).

  In addition, although the method of switching the presence or absence of the stop of the axis movement by selecting the valid / invalid of the alarm display switch has been explained, it is equipped with an automatic workpiece feeding / unloading device to automatically process multiple workpieces continuously. The alarm display switch is automatically disabled during online operation, and the alarm display switch is automatically activated for the safety of workers when performing offline operation in which workpieces are manually fed / unloaded and processed one by one. It may be effective.

  Even in the offline operation, the alarm display switch may be automatically disabled when an auxiliary table for ensuring the safety of the operator is installed before and after the table of the plate material processing machine.

DESCRIPTION OF SYMBOLS 1 Turret punch press 3 Work clamp apparatus 5 X-axis carriage 7 Y-axis carriage 9 Plate material positioning apparatus 11 Main body frame 11b Lower frame 11u Upper frame 13 Upper turret W Workpiece

Claims (3)

Obtained from workpiece size data obtained from workpiece size information added to the machining program and machining command values of the machining program in a plate material processing machine with a numerical control device equipped with a plate material positioning device having an automatic workpiece repositioning mechanism From the coordinate data, whether or not the workpiece that is moved and positioned to the machining command value overhangs from the work table of the plate material processing machine is calculated in the numerical control device, if overhanging , or From the coordinate data obtained from the gripping change command value in the machining program, the gripping change direction of the workpiece set at the origin position of the plate material positioning device and the movement distance of the gripping are obtained, and the workpiece exceeds the workpiece table. When the amount of hang is calculated by the numerical controller In this case, the state of the alarm display switch that is set to enable or disable whether or not to display an alarm indicating this overhang on the display device is checked. If this alarm display switch is enabled, the alarm is displayed on the display device. At the same time, the axis movement of the plate material positioning device set by the axis movement speed automatic setting dialog box is stopped when the axis movement of the plate material positioning device is stopped and the operator issues a restart command after confirming the alarm. At the speed, the machining at the machining command value is resumed, or the workpiece is moved to the next machining command coordinate value and machining is continued. When the alarm display switch is invalid, the alarm is displayed. Numerical control characterized in that machining is continued without being displayed on the apparatus and without stopping the axial movement of the plate material positioning apparatus Safe method of operating a location with a plate material processing machine. 2. The plate material processing machine with a numerical control device according to claim 1, wherein when the workpiece program is re-placed a plurality of times in the machining program, each time the grasp-replacement is performed, the workpiece re-gripping direction and the re-gripping The movement distance is calculated by the numerical control device, and then the state of the alarm display switch for setting whether the alarm for notifying the overhang is displayed on the display device is checked. A safe operation method for plate processing machines with numerical controllers . The plate material processing machine with a numerical control device according to claim 2, wherein the movement distance of re-grabbing after execution of re-grabbing a plurality of times is integrated, and the re-gripping direction is based on the origin from the accumulated movement distance. , Judge whether the initial position of machining (± 0), positive direction or negative direction, and if the initial position of machining (± 0) or positive direction, return to the origin of the plate material positioning device If the alarm display switch is valid, check whether the alarm display switch is enabled or disabled. , The alarm is displayed on the display device, and at the same time, the axis movement of the plate material positioning device is stopped, and when the operator gives a restart command after confirming the alarm, the plate material positioning device is returned to the origin. Numerical processing, characterized in that when machining is finished and the alarm display switch is invalid, the return to origin is executed without stopping the axis movement of the plate material positioning device to finish machining. Safe driving method for plate processing machine with equipment .

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