JP5281325B2 - Processing machine control device and processing machine control method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To properly set the dead zones of auto-index dies. <P>SOLUTION: There is disclosed a control device 61 for a working machine 1 having a station capable of positioning dies P1, D1 so as to be freely rotatable, and performs control of the working of a workpiece W clamped by a clamp 23 in the dies P1, D1. Then, in the case that the dies P1, D1 fitted to the station are notched dies P1, D1 having clamp relief parts, the control device includes: an interference region set means setting the interference region between the notched dies P1, D1 and the clamp 23 in accordance with the C-axis rotary angle of the notched dies P1, D1; and an evasion control means performing control to evade the interference between the notched dies and the clamp. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a processing machine control device and a processing machine control method, and more specifically, has a station on which a notch mold can be rotatably mounted, a notch mold (sheet saver mold), a clamp, The present invention relates to a control device for a processing machine that controls interference avoidance and a control method for the processing machine.

  Conventionally, in a punching press, interference between a mold for processing a workpiece W and a clamp for gripping the workpiece W is avoided by software processing.

  That is, the currently selected mold is identified from a plurality of molds arranged on the turret disk, and in the case of a notch mold (sheet saver mold), the Y-axis interference target area (dead zone) is cut. By switching to the notch mold, the Y-axis interference target area is set smaller than that of the normal mold.

  For example, as shown in FIG. 7, the interference target area 107 between the normal mold (punch 103 and die 105) and the clamp 101 and the notch mold (111, 113) and the interference target area 115 of the clamp 109 are compared. Then, the interference target area 115 is small in the Y-axis direction, and the clamp 109 approaches the notch molds (111, 113) by the distance A.

  On the other hand, as shown in FIG. 8, when the notch molds (113, 115) are operated in the auto index station, depending on the rotation angle, the notch molds (113, 115) and the clamp 109 may interfere (for example, C Axis = 90 °).

  Here, the auto index station can rotate and position the punch via a motor and a belt linked to the motor, and rotate the die in synchronization with the punch via the motor and a belt linked to the motor. This is a station that can be positioned freely, and this rotation axis is called the C axis.

  Also, the notch mold (sheet saver mold) is different from the normal mold in the shape of the mold (including the plate holder: stripper plate), and has a notch to avoid interference with the clamp. A mold that can be approached by a clamp compared to a normal mold.

See also Patent Document 1.
JP-A-1-133620

  As described above, when the notch mold (sheet saver mold) is operated in the auto index station, the mold and the clamp may interfere with each other depending on the rotation angle of the C axis. There were problems such as deterioration of processing accuracy.

The invention according to claim 1, the mold has a rotatably positionable stations C axis, performing pressurization Engineering work which is gripped by the clamp for moving the positioning of the workpiece relative to the mold machining In the control device of the machine, when the die mounted on the station is a notch die having a clamp relief portion, the notch die and the clamp are arranged according to the rotation angle of the notch die. An interference target area setting means for setting an interference target area related to interference , the interference target area setting means, a mold determination unit for determining whether or not the mold mounted on the station is a notch mold; A C-axis angle discriminating unit for determining a C-axis rotation angle of the notch mold on the C-axis, and a dead zone for setting an interference target area of the notch mold with reference to the judgment of the C-axis angle discriminating unit A control unit; A control device for processing machine is equipped.

  The invention according to claim 2 includes an avoidance control unit that performs control for avoiding interference between the notch mold and the clamp based on the interference target area when the notch mold is rotated. This is a control device for a processing machine.

  The invention according to claim 3 is the control device for the processing machine, wherein the avoidance control means performs a process of changing the rotation angle of the notch mold after raising the ram to the top dead center.

  According to the present invention, the interference target area (dead zone) of the notch mold (sheet saver mold) in the auto index station is switched according to the positioning angle of the C axis, and the narrow interference target area at a predetermined C axis angle. Since a wide interference target area is selected at other C-axis angles, an appropriate interference target region can be set. That is, even if the C-axis positioning angle is changed by the auto index station, it is possible to select an appropriate interference target area of the notch mold, thereby achieving an effect of shortening the machining time and preventing the punch from being punched out.

  In addition, since the notch mold and the clamp may interfere with each other due to the rotation of the C axis in the interference target area of the notch mold, the press is raised to the top dead center once before the C axis rotation. Interference can be avoided by performing the process of rotating the shaft.

  FIG. 1 shows an embodiment of an NC turret punch press 1 as an example of a processing machine according to the present invention. The NC turret punch press 1 has a gap portion 5 in the center of the frame 3, and the upper turret 7U is rotatably supported by the upper frame 3U in the gap portion 5. The lower turret 7L is rotatably supported by the lower frame 3L so as to face the upper turret 7U. A ram cylinder 9 is provided at a location corresponding to the machining position of the upper frame 3U, and machining is performed by lowering the ram 11.

  The diameter of the upper turret 7U is smaller than the diameter of the lower turret 7L, and the right end of the lower turret 7L protrudes from the upper turret 7U in FIG. A plurality of punches P are replaceably provided on the upper turret 7U, and a plurality of dies D are interchangeably provided on the lower turret 7L. A die lifting cylinder 13 for lifting the die D at the time of mold replacement is provided below the mold replacement position of the lower turret 7L.

  Further, a work table 15 is provided in the gap portion 5, and a carriage base 21 that can be moved and positioned in the Y-axis direction by a Y-axis motor 17 and a Y-axis ball screw 19 is provided above the work table 15. ing. The carriage base 21 is provided with an X carriage 25 that can be moved and positioned in the X-axis direction by an X-axis moving mechanism (not shown) after the workpiece W is clamped by a clamper 23.

  Accordingly, the workpiece W clamped by the clamper 23 is supported by the workpiece table 15, positioned in the X-axis direction by the X-carriage 25, and the Y-axis motor 17 rotates the Y-axis ball screw 19 to move the carriage base 21 in the Y-axis direction. To be positioned. Then, the upper turret 7U and the lower turret 7L are rotated, the punch P and the die D used for processing are indexed to the processing position, and the ram 11 is lowered by the ram cylinder 9 to process the workpiece W.

  The station at the processing position can rotate and position the punch P1 with respect to the C axis via the motor 53 and the belt 53a linked to the motor 53, and the die D1 can be rotated to the motor 55 and the belt 55a linked to the motor 55. An auto index station that can rotate and position with respect to the C-axis is configured.

  On the other hand, an ATC device 35 provided with a tool changer 31 and a tool magazine 33 is provided adjacent to the mold changing position of the turret punch press 1 in FIG.

  The tool changer 31 is provided with a punch arm 37 for exchanging the punch P at the top, and a punch gripper 39 for gripping the punch P is provided at the tip of the punch arm 37. A die arm 41 for exchanging the die D is provided below the punch arm 37, and a die gripper 43 for holding the die D is provided at the tip of the die arm 41. The punch arm 37 and the die arm 41 are moved up and down by rotating a screw member 47 by a motor 45 and rotated.

  The tool magazine 33 is provided with a plurality of storage arms 49 for storing a plurality of punches P and dies D, and the punches P and dies D that are rotated and replaced by the motor 51 can be indexed to the replacement position. Yes.

  With the above configuration, when exchanging the punch P and the die D, the punch P and the die D before the exchange in the upper turret 7U and the lower turret 7L are indexed to the die exchanging position, and an ejector pipe (not shown) by the die lifting cylinder 13 ) Are pushed up to the upper surface of the lower turret 7L, the punch P is taken out from the upper turret 7U by the punch gripper 39 of the punch arm 37, and the die D is taken out from the lower turret 7L by the die gripper 43 of the die arm 41.

  Then, the punch arm 37 and the die arm 41 are rotated 180 degrees and moved up and down as necessary, and the old punch P and die D are stored at predetermined positions of the tool magazine 33.

  Conversely, the punch arm 37 and the die arm 41 are moved to the tool magazine 33 side and moved up and down if necessary, and the punch P and the punch P stored in the tool magazine 33 by the punch gripper 39 and the die gripper 43 are used. The die D is taken out, the punch arm 37 and the die arm 41 are rotated 180 degrees, and the punch P and the die D are mounted.

  A controller 61 is connected to the NC turret punch press 1 via a communication cable 59. The control device 61 includes a display unit 63, an input unit 65, and a control unit 67. The display unit 63 displays the operation status of the NC turret punch press 1, the machining program being executed, and the like. The input unit 65 functions as a touch panel and displays an operation function of the NC turret punch press 1 as a menu. The controller 67 controls the NC turret punch press 1 to machine the workpiece W according to the read machining program.

  Please refer to FIG. The control unit 67 includes a program execution unit 69, a mold determination unit 71, and a C-axis angle determination unit 73.

  Further, a dead zone control unit 75, an XY axis dead zone detection unit 77, an XY axis control unit 79, a C axis control unit 81, and a press control unit 83 are provided. The mechanical system 85 includes an XY shaft 87, a C shaft 89, and a press unit 91.

  The program execution unit 69 reads a machining program (NC data or the like) and executes die machining on the workpiece W according to the machining program.

  The mold determination unit 71 determines whether the auto index station is a normal mold or a notch mold (sheet saver mold) based on the machining program of the program execution unit 69. In this example, the notch mold has a notch to avoid interference with the clamp, unlike the normal mold, and the shape of the plate holder and stripper plate of the mold is different from that of the normal mold. A mold that can be closer to

  The C-axis angle determination unit 73 reads the block end point position of the notch mold on the C-axis based on the machining program of the program execution unit 69.

  The dead zone control unit 75 performs a dead zone interference prevention process based on detection information from the XY axis dead zone detection unit 77 and the XY axis control unit 79.

  The XY axis dead zone detection unit 77 detects whether or not it is within the X axis and Y axis interference target area (in the dead zone) based on the position information obtained by the XY axis control unit 79.

  That is, the setting of the interference target area, which is an area where the mold and the clamp may interfere, is set as a parameter for each mold size, and the dead zone when the X-axis and Y-axis of the clamp enter the interference target area Detect as inside.

  The XY axis control unit 79 controls the positioning of the X and Y axes. The C-axis control unit 81 performs C-axis positioning control. That is, the C-axis interlock is performed in the notch mold interference target area because of mold interference. Then, after avoiding interference, the interlock is released.

  The press control unit 83 controls the press based on the command of the machining program of the program execution unit 69. Then, when the C-axis movement is attempted in the interference target area of the notch mold based on the command of the dead zone control unit 75, the press control unit 83 once raises the top dead center to avoid the mold interference.

  The XY axis 87 positions the X and Y axes. The C axis 89 positions the C axis. The press 91 performs punching.

  Here, the mold discriminating unit 71, the C-axis angle discriminating unit 73, and the dead zone control unit 75 function as interference target area setting means, and an X and Y axis dead zone detecting unit 77, an X and Y axis control unit 79, The C-axis control unit 81 functions as an avoidance control unit.

  FIG. 3 shows the operation of the control unit 67.

  First, in step S01, the control unit 67 starts a series of processes.

  In step S03, the mold discriminating unit 71 determines whether or not the mold indexed to the processing position is a notch mold (sheet saver mold). If it is determined that the notch mold is used, the process proceeds to step S05. If it is determined that it is not a notch mold, the process proceeds to step S33. In step S33, a punching press is performed and the process returns to step S01.

  In step S05, the control unit 67 determines whether or not the turret target station of the NC turret punch press 1 is an auto index (AI) station. If it is determined that the station is an auto index station, the process proceeds to step S07. If it is determined that the station is not an auto index station, the process proceeds to step S33. In step S33, a punching press is performed and the process returns to step S01.

  In step S07, the mold discriminating unit 71 determines whether the mold is immediately after the T change. If it is determined that T has just changed, the process proceeds to step S09. If it is determined that it is not immediately after T change, the process proceeds to step S11. Here, “immediately after the change of T” means that the turret is rotated, the different stations are indexed and the die is changed to a die having a different T number.

  In step S11, the press control unit 83 determines whether or not it is immediately after the press is lifted. Details will be described later.

  In step S09, the press control unit 83 performs a press weight process. As a result, the press operation is stopped. In step S13, the C-axis control unit 81 performs C-axis interlock. Thereby, the rotation operation with respect to the C axis is stopped.

  In step S15, the C-axis angle determination unit 73 reads the C-axis block end point position. In this example, in the case of the cut-out molds P1 and D1, the case where the clamp 23 is accessible as shown in FIG. On the other hand, as shown in FIG. 5, when the notch molds P1 and D1 are close to the clamp 23 in the same manner as a normal mold, 90 degrees is set in advance.

  In step S17, the C-axis angle discriminating unit 73 determines whether or not the block end point position is 0 degree with respect to the C-axis. In the case of 0 degree, the process proceeds to step S19. If not, the process proceeds to step S21.

  In step S19, the dead zone control unit 75 sets an interference target area (dead zone) of the notch mold (sheet saver mold).

  In step S21, the dead zone control unit 75 performs setting of an interference target area (dead zone) for each normal mold size.

  Please refer to FIG. 4 and FIG. Depending on the C-axis rotation angle of the notch mold (sheet saver mold), the interference target area is set differently. FIG. 4 shows a set interference target area DZ1 for a notch die composed of a punch P1 and a die D1 with a C-axis rotation angle of 0 degrees. FIG. 5 shows a set interference target area DZ2 for a notch die composed of a punch P1 and a die D1 with a C-axis rotation angle of 90 degrees.

  As a result, the distance A1 between the end of the clamp 23 that holds the workpiece W shown in FIG. 4 and the center of the notch molds P1 and D1 is equal to the end of the clamp 23 that holds the workpiece W shown in FIG. Since it is shorter than the distance A2 to the center of P1 and D1, it can approach more.

  As described above, the interference target area can be set not only for the notch mold (sheet saver mold) but also for a deformed mold such as a slotting mold (mold whose outer shape is not circular). Furthermore, the interference target area can be set even when the C-axis is an arbitrary angle (an angle other than 0 degrees or 90 degrees).

  As shown in FIG. 6, when the outer shape of the punch P <b> 1 is surrounded by the arcs R <b> 1 and R <b> 2 and the straight lines L <b> 1 and L <b> 2 and the mold has a C axis rotation angle of 45 degrees, The distance A3 between the end and the center of the notch molds P1 and D1 is set to be the same as the distance A2 between the end of the clamp 23 that grips the workpiece W at an angle of 90 degrees and the center of the notch mold. Can be avoided. Further, the interference target area can be set by offsetting the shape surrounded by the arcs R1 and R2 and the straight lines L1 and L2 that are the outer shape of the punch P1 so as to increase outward.

  On the other hand, in addition to processing whether the clamp is in the interference target area as described above, the non-contact sensor detects that the clamp has entered the interference target area to detect that it has entered the dead zone. It can also be judged.

  In step S23, the C-axis control unit 81 releases the C-axis interlock.

  In step S25, the XY axis dead zone detection unit 77 determines whether the clamp is in the interference target area. If it is outside the interference target area (outside the dead zone), the process proceeds to step S27. When it is not outside the interference target area (within the dead zone), the process proceeds to step S29.

  In step S27, the stop state is released by the press weight releasing process, and the press work is performed in step S33, whereby efficient machining can be performed.

  In step S29, it is determined whether or not pressing is possible. At this time, the turret punch press is in a stopped state. By visually checking the interference between the clamp and the mold at that time, and if it is confirmed that the press can be processed without interference between the clamp and the mold, the stop state of the turret punch press is manually released. The process proceeds to step S27.

  When it is determined that pressing is not possible, the process proceeds to step S31.

  In step S27, the press wait state is released. In step S31, the processing is terminated as resumption is impossible.

  In step S33, a punching press is executed. Then, after the press is executed in step S33, the process returns to step S01, and the above-described process is repeated.

  On the other hand, in step S11 described above, it is determined whether or not it is immediately after the press is lifted. Here, “immediately after raising the press” is a state in which the stroke is usually shortened in order to improve the punching efficiency, but is raised to the upper limit in order to avoid interference with the clamp during the rotation of the mold. That is, the following process is a process for avoiding the interference between the clamp and the notch mold due to the C-axis rotation because the punching stroke is short.

  In step S35, the XY axis dead zone detector 77 determines whether or not the clamp is within the normal interference target area for each mold size. When it is determined that the area is within the normal interference target area, the process proceeds to step S37. If it is determined that it is not within the normal interference target area, the process proceeds to step S41.

  In step S37, the press is stopped by the press weight control of the press control unit 83. In step S39, the C-axis control unit 81 performs C-axis interlock, and the rotation operation with respect to the C-axis is stopped.

  In step S41, the C-axis control unit 81 determines whether or not the C-axis moving signal is ON. If the C-axis moving signal is in the ON state, the dead zone control unit 75 proceeds to step S45 where interference avoidance processing is performed. If the C-axis moving signal is not ON, the process proceeds to step S43.

  In step S43, the C-axis interlock is released. Subsequently, the process proceeds to step S25.

  In step S45, the press control unit 83 performs press up. That is, after raising the ram to the top dead center, the C-axis control unit 81 can release the interlock in step S47, and the process of changing the C-axis rotation angle of the notch mold can be performed. As a result, for example, the interference target area (dead zone) of the notch mold (sheet saver mold) is currently set and the clamp and the mold do not interfere with each other, but the interference target area (dead) according to the normal mold size If there is a relationship between the clamp and the mold that can be detected as interference if it is a zone), rotating this notch mold will prevent the clamp and mold from interfering during rotation. it can. Thereafter, the process returns to step S01.

  In step S47, the C-axis control unit 81 releases the C-axis interlock, and the process returns to step S01.

  The present invention is not limited to the embodiment of the invention described above, and can be implemented in other modes by making appropriate modifications.

It is the schematic which shows schematic structure of the processing machine which concerns on this invention. It is the schematic which shows schematic structure of a control part. It is a flowchart which shows operation | movement of a control part. It is explanatory drawing explaining an interference object area (dead zone). It is explanatory drawing explaining an interference object area (dead zone). It is explanatory drawing explaining an interference object area (dead zone). It is a prior art explaining a prior art. It is a prior art explaining a prior art.

Explanation of symbols

1 Turret punch press 3 Frame 3U Upper frame 3L Lower frame 5 Gap part 7U Upper turret 7L Lower turret 11 Ram 13 Cylinder 15 Work table 17 Y-axis motor 19 Y-axis ball screw 21 Carriage base 23 Clamper 25 X Carriage 27 Position cylinder 29 Forming Cylinder 31 Tool changer 33 Tool magazine 35 ATC device 37 Punch arm 41 Die arm 43 Die gripper 45 Motor 47 Screw member 49 Storage arm 51 Motor 61 Control device 63 Display unit 65 Input unit 67 Control unit 69 Program execution unit 71 Mold discrimination Unit 73 C-axis angle discriminating unit 75 Dead zone control unit 77 X, Y-axis dead zone detection unit 79 X, Y-axis control unit 81 C-axis control unit 83 Press control unit 85 Mechanical system 87 X, Y-axis 8 C shaft 91 press section P, P1 punch D, D1 die W workpiece

Claims (3)

The mold has a rotatably positionable stations C axis, the control unit of the processing machine performing a pressurizing Engineering of gripped workpiece clamp for moving the positioning of the workpiece relative to the die,
When the die mounted on the station is a notch die having a clamp relief portion, an interference target area related to interference between the notch die and the clamp according to a rotation angle of the notch die. comprising a collision target area setting means for setting a,
The interference target area setting means determines a mold discriminating unit for discriminating whether or not a mold mounted on the station is a notch mold, and a C axis rotation angle of the notch mold on the C axis. Control of a processing machine comprising: a C-axis angle determining unit; and a dead zone control unit that sets an interference target area of a notch mold with reference to the determination of the C-axis angle determining unit apparatus.   2. The apparatus according to claim 1, further comprising an avoidance control unit configured to perform control for avoiding interference between the notch mold and the clamp based on the interference target area when the notch mold is rotated. The control apparatus of the described processing machine.   The said avoidance control means performs the process which changes the said rotation angle of the said notch metal mold | die after raising a ram to a top dead center, The control apparatus of the processing machine of Claim 2 characterized by the above-mentioned.

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