JP2008161975A - Centering method of die of punching machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a centering method of a die of a punching machine capable of easily and speedily centering the axis of a die to be concentric with the axis of a punch pin. <P>SOLUTION: It is devised to move a die holder 22 through a connecting member 50 while observing the punch pin 12 and the die 23 by a camera 70 by; installing an XY stage 60 free to move against the shaft center Q of the punch pin 12 on a base 2 of the punching machine 1; holding the connecting member 50 on the die holder 22; connecting the connecting member 50 to the XY stage 60 free to integrally move; and in the meantime, installing the camera 70 free to observe a relative position of the punch pin 12 and the die 23 by magnifying it on the base 2 of the punching machine 1. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a punching machine for centering a die of a punching machine that punches a fine hole or the like in a sheet-like workpiece by hitting a punch pin with a die of a die holder below the punch pin so that its axis is concentric with the axis of the punch pin. The present invention relates to a method for centering a die of a machine.

In order to punch a fine hole or the like in a sheet-like workpiece by hitting the punch pin to the die, the position of the hole provided in the center of the punch pin and the die must be concentrically coincident with each other. With such a device, it is known to adjust the mounting position of the die holder holding the die so that the axis of the die is aligned with the axis of the punch pin.
The die setter described in Patent Document 1 corresponds to a punch unit (punching mechanism) in which a punch held by a punch holder in a flat and thin case and a die held by the die holder are arranged vertically opposite to each other. A setter body provided with an adjusting screw for moving the die holder, and a ring-shaped guide rail is disposed so as to surround the setter body, and a microscope member (for example, a CCD) is disposed on the guide rail via a support member. Built-in microscope camera) is installed. In this die setter, the microscope holder is used to see through the punch and die at the same time, and the adjustment screw is operated to adjust the die holder mounting position so that the die axis is aligned with the punch axis. Yes.
Japanese Patent No. 2888429

In the above-mentioned Patent Document 1, since the adjustment screw is brought into contact with the die holder, it is impossible to move the die holder back and forth with one adjustment screw, and the die holder holding the die with a plurality of adjustment screws is used. Since it must be moved, there is a problem that the centering work of the die takes a long time. In addition, whenever it is necessary to center the die, the punch unit must be removed from the machine body, and the die of the punch unit must be centered by the die setter. There are also problems that require time, and there is a problem that the die on the punching machine cannot be centered. Furthermore, since the position adjustment operation of the die holder is performed using a plurality of adjustment screws, there is a problem that it is difficult and requires skill.
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the above-described problems, and to provide a die centering method for a punching machine capable of easily and quickly centering the die so that the axis of the die is concentric with the axis of the punch pin. For the purpose.

The present invention relates to a punching machine for centering a die of a punching machine that punches a fine hole or the like in a sheet-like workpiece by hitting a punch pin with a die of a die holder below the punch pin so that its axis is concentric with the axis of the punch pin. In the centering method of the die of the machine, a movable stage that is movable relative to the axis of the punch pin is mounted on the base of the punching machine, and the movable stage is coupled to the die holder so as to be integrally movable, while the punch pin is attached to the base of the punching machine And an observation device capable of observing by enlarging the relative position of the die, and observing the punch pins and the die by the observation device, and moving the die holder by the moving stage to center.
Further, the present invention provides a punching machine die for punching fine holes and the like in a sheet-like workpiece by hitting a punch pin with a die of a die holder below the punch pin so that its axis is concentric with the axis of the punch pin. In a punching machine die centering method, a movable stage movable with respect to the punch pin axis is mounted on the punching machine base, and a connecting member is sandwiched between the die holders, and the connecting member is integrated with the moving stage. At the same time, an observation device that can observe the punch pins and the die by enlarging the relative positions of the punch pins and the die is mounted on the base of the punching machine, and the connecting member is attached to the die holder by the moving stage while observing the punch pins and the die by the observation device. And centering by moving through the second aspect (claim 2).

Further, according to the present invention, the moving stage is configured by an XY stage that can move in two directions orthogonal to the axis of the punch pin, and the die holder is moved by the XY stage while observing the relative positions of the punch pin and the die with an observation device. The die holder is moved in the direction of movement of the die so that it is symmetric with respect to the axis of the punch pin, and then the die holder is concentric with the axis of the punch pin in the other direction of movement by the XY stage. The centering is carried out by moving so as to become (Claim 3).
The present invention also includes an arc-shaped guide rail centered on the axis of the punch pin, the observation device is attached to the guide rail so as to be guided and moved, and the observation device is moved when the die holder is moved by the moving stage. The observation device is moved so as to observe from a direction substantially perpendicular to the moving direction of the moving stage, and the punch pin and the die are observed from different directions by one observation device so that the die is concentric with the axis of the punch pin. (Claim 4).

Further, the present invention provides a punching machine die centering method in which a plurality of punch pins are arranged side by side, and a support base in which a moving stage and an observation device are mounted on a base removable from the base of the punching machine. After the centering of the die on one end side is finished, the support base is moved in the direction of the die on the other end side. The position of the next die is centered by changing the position by an amount corresponding to the pitch of the punch pins arranged in parallel (Claim 5).
In the present invention, the observation device is configured by a camera that can be connected to the display device, the camera is connected to a display device equipped in the punching machine, and an image captured by the camera is displayed on the display device of the punching machine, The die holder is centered by moving the die holder on the moving stage based on the photographed image of the display device (claim 6).

The present invention mounts a movable stage that can move with respect to the axis of a punch pin on the base of the punching machine, and couples the movable stage to the die holder so as to be able to move integrally. On the other hand, the relative position of the punch pin and the die on the base of the punching machine The observing device that can be observed by magnifying is mounted, and the die holder is moved by the moving stage while observing the punch pin and the die by the observing device, so that the punching mechanism is removed from the punching machine, By moving the die holder while observing the relative positions of the punch pin and the die on the punching machine, the die can be centered easily and quickly with high accuracy, and the operating rate of the punching machine can be increased.
In the present invention, a movable stage that can move with respect to the axis of the punch pin is mounted on the base of the punching machine, and a connecting member is sandwiched between the die holder, and the connecting member is connected to the moving stage so as to be integrally movable. On the other hand, an observation device capable of observing the punch pins and the die by enlarging the relative positions of the punch pins and the die is attached to the base of the punching machine, and the die holder is moved through the connecting member by the moving stage while observing the punch pins and the die by the observation device. Since centering is performed, even when a plurality of punching mechanisms are arranged side by side and the die holder is arranged in a narrow space, the die holder can be easily moved by the moving stage via the connecting member. A plurality of dies can be easily and quickly centered with high accuracy.
Further, according to the present invention, the moving stage is configured by an XY stage that can move in two directions orthogonal to the axis of the punch pin, and the die holder is moved by the XY stage while observing the relative positions of the punch pin and the die with an observation device. The die holder is moved in the direction of movement of the die so that it is symmetric with respect to the axis of the punch pin, and then the die holder is concentric with the axis of the punch pin in the other direction of movement by the XY stage. Therefore, the die can be centered with high precision, the die centering operation time can be shortened, and the operating rate of the punching machine can be increased.

The present invention also includes an arc-shaped guide rail centered on the axis of the punch pin, the observation device is attached to the guide rail so as to be guided and moved, and the observation device is moved when the die holder is moved by the moving stage. The observation device is moved so as to observe from a direction substantially perpendicular to the moving direction of the moving stage, and the punch pin and the die are observed from different directions by one observation device so that the die is concentric with the axis of the punch pin. Therefore, the observation direction of the observation device can be easily changed in response to the change of the moving direction of the moving stage, the die centering time can be shortened and the manufacturing cost can be reduced.
Further, the present invention provides a punching machine die centering method in which a plurality of punch pins are arranged side by side, and a support base in which a moving stage and an observation device are mounted on a base removable from the base of the punching machine. After the centering of the die on one end side is finished, the support base is moved in the direction of the die on the other end side. Since the next die is centered by changing the position by the pitch of the punch pins arranged side by side, the positions of the support base on the base are changed by a predetermined pitch to center multiple dies on the punching machine. The operation can be repeated in a short time, and the entire centering operation time can be shortened.
In the present invention, the observation device is configured by a camera that can be connected to the display device, the camera is connected to a display device equipped in the punching machine, and an image captured by the camera is displayed on the display device of the punching machine, Since the die holder is moved by the moving stage based on the photographed image of the display device and the die is centered, the die holder is moved by the moving stage while checking the relative position of the punch pin and the die with the photographed image of the display device. Can be easily centered, and the die can be centered with high accuracy without requiring skill.

A punching machine 1 shown in FIG. 1 is a punching machine as described in, for example, Japanese Patent Application Laid-Open No. 2006-88286, and a work table 3 on which a work holder H that holds a sheet-like work W is placed on a base 2. And a flat servo motor 4 for moving the work holder H back and forth and right and left on the work table 3, and a punching mechanism 5 for drilling fine holes or the like in the work W between the flat servo motor 4 and the work table 3. It is a thing. The planar servo motor 4 and the punching mechanism 5 are controlled by a control device (not shown), and a display device 6 for operating the control device is provided above the base 2.
The punching mechanism 5 will be described. The punching mechanism 5 includes a punch unit 10 disposed on a frame 7 extending left and right above the base 2, and a die unit 20 disposed on a left and right projecting portion 8 provided on the base 2. . The punch unit 10 is configured such that the punch pin 12 moves in the vertical direction via a hammer mechanism 11 (for example, one described in JP-A-2003-266382). The die unit 20 is obtained by fixing a die holder 22 holding a die 23 by a clamping device 30 to a die base 21 fixed on the protruding portion 8. A die hole corresponding to the punch pin 12 is provided on the axis R of the die 23. In the present embodiment, three die holders 22 are arranged so as to correspond to the three punch pins 12. In the punching mechanism 5, fine holes and the like are formed in the workpiece W between the die holder 22 and the punch unit 10 by hitting the punch pins 12 to the die 23.

  Next, a centering device 40 for the die 23 that corresponds to the punching machine 1 having the above-described configuration and makes the axis R of the die 23 concentric with the axis Q of the punch pin 12 will be described. The base 2 of the punching machine 1 is provided with a plurality of female screw portions for attaching the base 41 of the centering device 40. When the work table 3 is installed on the base 2, a plurality of female screw portions are covered with the work table 3 (state shown in FIG. 1). The base 41 is provided with two guide grooves 42 along the direction in which the punch pins 12 are juxtaposed, and a T-nut 43 is inserted into each guide groove 42. The support base 44 is movable along the guide groove 42 by connecting the support base 44 on the base 41 to each T nut 43. Two positioning members 45 are fixed to the base 41 along the guide grooves 42, and each positioning member 45 has a predetermined pitch P equal to the parallel pitch of the punch pins 12 in the parallel direction of the punch pins 12. A positioning part 46 is provided. Positioning holes 47 are provided in the support base 44 so as to correspond to the positioning portions 46. By inserting the positioning pin 48 from the support base 44 into the positioning portion 46 of the base 41, the position of the support base 44 with respect to the base 41 is determined. A tilt adjustment bolt 49 is provided on the front surface of the base 41, and the bolt 49 adjusts the line L1 connecting the front and rear positioning pins 48 and the line L2 connecting the adjacent punch pins 12 to each other. In the present embodiment, the base 41 is attached to the base 2, but may be attached to a unit (case) of the punching mechanism 5.

On the support base 44, the die holder 22 is sandwiched and the movable stage 60 capable of moving the die holder 22 with respect to the axis Q of the punch pin 12 and the observation where the relative positions of the punch pin 12 and the die 23 can be enlarged are observed. A device 70 is provided. In the present embodiment, the moving stage 60 is constituted by an XY stage that can move in two directions orthogonal to the axis Q of the punch pin 12, and the connecting member 50 that can sandwich the die holder 22 on the XY stage 60 is provided. It is connected so that it can move together. The XY stage 60 is well known, and is configured to move two base members 61 and 62 in two orthogonal directions by a micrometer head 63. On the upper base member 61, clamp members 64 for clamping the rear end portion of the connecting member 50 are provided on the left and right.
As shown in FIG. 5, the connecting member 50 has a V-shaped positioning member 52 fixed to the front of the connecting member main body 51, and the die holder 22 in contact with the positioning member 52 swings around the shaft member 53 as a fulcrum. It is configured to be sandwiched between the arm members 54. The arm member 54 is configured to press the tip thereof against the die holder 22 by a bolt member 55. The connecting member main body 51 is provided with a through-hole 56 through which a wrench member passes in order to screw the bolt 31 of the clamping device 30 with the die holder 22 held therebetween. In this embodiment, the tip of the arm member 54 is pressed against the die holder 22 by the bolt member 55, but the tip of the arm member 54 is pressed against the die holder 22 by the spring force of the spring member instead of the bolt member 55. It may be.

Behind the XY stage 60 is provided an arcuate guide rail 71 centered on the axis Q of the punch pin 12, and one observation device 70 is attached to the guide rail 71 via a bracket 72 so as to be guided and moved. ing. With this observation device 70, the relative positions of the punch pin 12 and the die 23 are observed. More specifically, the observation device 70 observes the punch pins 12 and the die 23 from a direction substantially perpendicular to the moving direction of the XY stage 60. The bracket 72 is provided with a pin member 73. The support base 44 is provided with holes 74 at the observation positions E and F which are the aforementioned directions, and the observation device 70 observes the punch pins 12 and the die 23 by inserting the pin member 73 into the hole 74. It comes to be fixed with. The observation device 70 or the bracket 72 is provided with an illumination member (not shown) for projecting light to the relative positions of the punch pin 12 and the die 23.
The observation device 70 is configured by a camera that can be connected to the display device 6, and an image captured by the camera 70 can be displayed on the display device 6 of the punching machine 1. In the present embodiment, one camera 70 is fixed at two observation positions E and F along the guide rail 71. However, two cameras 70 are installed at the photographing positions E and F, respectively. May be. Further, the observation device 70 may be configured by a microscope, and the relative positions of the punch pin 12 and the die 23 may be observed by the microscope. Further, a microscope may be connected to the display device 6 so that an observation image is displayed on the display device 6.

  Next, a description will be given of a centering operation for making the axis R of the die 23 concentric with the axis Q of the punch pin 12 by the centering device 40. In order to maintain the processing accuracy, the punch unit 10 of the punching mechanism 5 is replaced every predetermined period. After the punch unit 10 is replaced, the die 23 of the die holder 22 is centered so as to be concentric with the axis Q of the punch pin 12 of the punch unit 10. First, the work table 3 is removed from the base 2, and the centering device 40 is attached to the front position of the die base 21. For example, when centering the middle die 23 shown in FIG. 3, the support base 44 is first moved so that the XY stage 60 is placed in front of the die holder 22 holding the die 23, and is supported by the positioning pins 48. The position of the base 44 is fixed. The connecting member 50 is sandwiched between the corresponding die holders 22, and the connecting member 50 is coupled to the XY stage 60 by the clamp member 64 so as to be integrally movable. Thereafter, the bolt 31 of the clamping device 30 is loosened to move the die holder 22 back and forth and right and left through the connecting member 50 by the XY stage 60. The camera 70 is fixed via the pin member 73 at an observation position E that is a direction substantially perpendicular to one moving direction of the XY stage 60.

Next, the punch pin 12 of the punch unit 10 is brought close to the die 23 via the frame 7 and the hammer mechanism 11. As shown in FIG. 6A, the relative positions of the punch pin 12 and the die 23 are photographed by the camera 70 at the observation position E, the enlarged photographed image is displayed on the display device 6, and the die holder 22 is moved to the XY based on the photographed image. The stage 60 is moved in one movement direction. The die 23 (die hole) is moved until it is symmetrical with the axis Q of the punch pin 12. 6B, the relative positions of the punch pin 12 and the die 23 are photographed by the camera 70 at the observation position F moved from the observation position E, and the enlarged photographed image is displayed on the display device 6, as shown in FIG. The die holder 22 is moved in the other movement direction by the XY stage 60 based on the photographed image. The die 23 is moved until the axis R of the die 23 is concentric with the axis Q of the punch pin 12. After the shaft core R of the die 23 is concentric with the shaft core Q of the punch pin 12, the bolt 31 is screwed by a wrench member (not shown) through the through hole 56 of the connecting member 50, and the die holder is clamped by the clamp device 30. By fixing 22 to the die base 21, the centering operation of the die 23 is completed.
When the centering operation of the right (left) die 23 is subsequently performed, the connecting member is removed from the die holder 22 and the connecting member 50 is also removed from the XY stage 60. Then, the positioning pin 48 is once removed, and the support base 44 is moved to the right (left side) so that the XY stage 60 is arranged in front of the die holder 22 holding the right (left) die 23. The position of the support base 44 is fixed. Thereafter, the die holder 22 is moved by the XY stage 60 so that the axis R of the die 23 is concentric with the axis Q of the punch pin 12 as described above. In this embodiment, the punching mechanism 5 installed on the base 2 of the punching machine 1 is described. However, as in the prior art, the flat and thin case is held by the punch and the die holder. In the case of a punching mechanism in which a die is disposed in a vertically opposed manner, a base 41 (die setter mounting portion) is fixed to a case of the punching mechanism, and a die holder is attached to a support base 44 on the base 41. A movable stage 60 or the like that can be held and moved may be installed.

  Accordingly, the movable stage 60 that can move with respect to the axis Q of the punch pin 12 is mounted on the base 2 of the punching machine 1 and the movable stage 60 is coupled to the die holder 22 so as to be integrally movable, while the base 2 of the punching machine 1 is connected. An observation device 70 that can be observed by enlarging the relative positions of the punch pin 12 and the die 23 is attached to the die holder 22, and the die holder 22 is moved by the moving stage 60 while being centered while observing the punch pin 12 and the die 23 by the observation device 70. Therefore, without removing the punching mechanism 5 from the punching machine 1, the die holder 22 is moved while observing the relative positions of the punch pins 12 and the die 23 on the punching machine 1, thereby eliminating the need for skill. Punching can be centered easily and quickly with high accuracy. It is possible to increase the operating rate of the thin 1. Further, a movable stage 60 that is movable with respect to the axis Q of the punch pin 12 is mounted on the base 2 of the punching machine 1, and the connecting member 50 is sandwiched between the die holder 22 and the connecting member 50 is integrated with the moving stage 60. An observing device 70 is mounted on the base 2 of the punching machine 1 so that the relative positions of the punch pins 12 and the die 23 can be enlarged and observed, and the observation device 70 observes the punch pins 12 and the die 23. Since the die holder 22 is moved by the moving stage 60 via the connecting member 50 and centered, the die holder 22 is connected even when the punching mechanisms 5 are arranged in parallel and the die holder 22 is arranged in a narrow space. A plurality of stages that can be easily moved by the moving stage 60 via the member 50 and are arranged in parallel. The die 23 can be centered easily quickly and accurately.

  Further, the moving stage 60 is composed of an XY stage that can move in two directions orthogonal to the axis Q of the punch pin 12, and the die holder 22 is moved to the XY while observing the relative positions of the punch pin 12 and the die 23 with the observation device 70. The stage 60 moves the axis 23 of the die 23 in one movement direction so as to be symmetric with respect to the axis Q of the punch pin 12, and then the die holder 22 moves the die 23 in the other movement direction by the XY stage 60. Since the shaft core R is moved and centered so as to be concentric with the shaft core Q of the punch pin 12, the die 23 can be centered with high precision, and the punching machine can shorten the centering time of the die 23. The operating rate of 1 can be increased. In addition, an arcuate guide rail 71 centered on the axis Q of the punch pin 12 is provided, and the observation device 70 is attached to the guide rail 71 so as to be guided and moved, and when the die holder 22 is moved by the moving stage 60, The observation device 70 is moved so that the observation device 70 is observed from a direction substantially perpendicular to the moving direction of the moving stage 60, and the die 23 is observed by observing the punch pin 12 and the die 23 from different directions by one observation device 70. Since centering is performed so that it is concentric with the axial center Q of the punch pin 12, the observation direction of the observation device 70 can be easily changed corresponding to the change of the moving direction of the moving stage 60, and the centering time of the die 23 is shortened. In addition, the manufacturing cost can be reduced.

  In the centering method of the die 23 of the punching machine 1 in which a plurality of punch pins 12 are arranged side by side, the moving stage 60 and the observation device 70 are mounted on the base 41 that can be attached to and detached from the base 2 of the punching machine 1. A support base 44 is provided so that the position of the support base 44 can be changed at a predetermined pitch P that is the same as the pitch of the punch pins 12 in the direction in which the punch pins 12 are juxtaposed. Since the position of the support base 44 is changed in the direction of the end die 23 by the pitch of the punch pins 12 and the next die 23 is centered, the support base 44 is placed on the base 41 at a predetermined pitch P. By changing the position one by one, the centering operation of the plurality of dies 23 on the punching machine 1 can be repeated in a short time, and the entire centering operation time can be shortened. Further, the observation device 70 is configured by a camera that can be connected to the display device 6, the camera 70 is connected to the display device 6 provided in the punching machine 1, and an image captured by the camera 70 is displayed on the display device 6 of the punching machine 1. Since the die holder 22 is moved by the moving stage 60 based on the photographed image of the display device 6 and the die 23 is centered, the relative position between the punch pin 12 and the die 23 is confirmed by the photographed image of the display device 6. However, the die holder 22 can be moved by the moving stage 60 to easily center the die 23, and the die 23 can be centered with high accuracy without requiring skill.

It is a side view of the punching machine which can attach the centering apparatus of this invention. FIG. 2 is a II view of FIG. 1. It is a figure which shows the state which attached the centering apparatus to the punching machine. FIG. 4 is a side view of FIG. 3, showing a state where the camera has moved to a central position. It is an enlarged plan view of a connecting member. It is a figure which shows the movement state of a connection member with a movement stage.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Punching machine 2 Base 6 Display device 12 Punch pin 22 Die holder 23 Die 40 Centering device 41 Base 44 Support base 50 Connecting member 60 XY stage 70 Camera 71 Guide rail P Predetermined pitch Q Axis core (punch pin)
R shaft core (die)
W Work

Claims (6)

A punching machine die that punches fine holes etc. in a sheet-like workpiece by hitting the punch pin with the die of the die holder below the punch pin so that its axis is concentric with the axis of the punch pin. In the centering method, a movable stage that is movable relative to the axis of the punch pin is mounted on the base of the punching machine, and the movable stage is coupled to the die holder so as to be movable together, while the punch pin and the die are relative to the base of the punching machine. A die centering method for a punching machine, comprising mounting an observation device that can be observed by enlarging the position, and moving the die holder with a moving stage while observing the punch pins and the die with the observation device. A punching machine die that punches fine holes etc. in a sheet-like workpiece by hitting the punch pin with the die of the die holder below the punch pin so that its axis is concentric with the axis of the punch pin. In the centering method, a movable stage that is movable with respect to the axis of the punch pin is attached to the base of the punching machine, and a connecting member is sandwiched between the die holder, and the connecting member is coupled to the moving stage so as to be integrally movable, On the other hand, an observation device capable of magnifying the relative positions of the punch pins and the die is attached to the base of the punching machine, and the die holder is moved through the connecting member by the moving stage while observing the punch pins and the die with the observation device. A punching machine die centering method characterized by: The moving stage is composed of an XY stage that can move in two directions perpendicular to the axis of the punch pin, and the die holder is moved in one moving direction by the XY stage while observing the relative position of the punch pin and the die with an observation device. Move the position so that the position is symmetric with respect to the axis of the punch pin, and then move the die holder to the other moving direction on the XY stage so that the axis of the die is concentric with the axis of the punch pin. 3. The die centering method for a punching machine according to claim 1, wherein the die is centered. An arc-shaped guide rail centered on the axis of the punch pin is provided, and the observation device is attached to the guide rail so as to be guided and moved. When the die holder is moved by the moving stage, the observation device is moved in the moving direction of the moving stage. The observation device is moved so as to observe from a substantially perpendicular direction, and the punch pin and the die are observed from different directions by one observation device, and the die is centered so as to be concentric with the axis of the punch pin. The punching machine die centering method according to any one of claims 1 to 3. In a punching machine die centering method in which a plurality of punch pins are arranged side by side, a support base on which a moving stage and an observation device are mounted on a base that can be attached to and detached from the base of the punching machine is arranged in the direction in which the punch pins are arranged in parallel. After the centering of the die on one end side is finished, the support base is placed in the direction of the die on the other end side, and the position of the support base is arranged side by side. 5. The die centering method for a punching machine according to claim 1, wherein the position of the die is changed by changing the position by the pitch. The observation device is composed of a camera that can be connected to a display device, the camera is connected to a display device equipped in the punching machine, and an image captured by the camera is displayed on the display device of the punching machine, and the captured image of the display device is displayed. 6. The die centering method for a punching machine according to claim 1, wherein the die holder is moved by a moving stage on the basis of the die holder to perform centering of the die.

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