JP2013046940A - Punching method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve working accuracy while maintaining productivity in punching processing.SOLUTION: A punching method includes heating of a punch for punching a material by shearing force with a die and punching the material by moving the punch in a shearing direction in which the material is sheared.

Description

  The present invention relates to a punching method.

  Various materials are stamped. Among them, in a printed wiring board or the like, router processing or the like is performed after punching in order to prevent whitening of a punched portion and to remove burrs.

  Patent Document 1 discloses that a printed wiring board is punched.

JP 2008-171954 A

  However, according to the method of Patent Document 1, since various processes are performed after punching, the number of processes is increased and the cost is increased. Therefore, it is desired to increase the processing accuracy while maintaining productivity.

  The present invention has been made in view of such circumstances, and an object thereof is to increase machining accuracy while maintaining productivity in punching.

In order to achieve such an object, the punching method according to the present invention is:
Heating a punch that punches material with shear force between the dies;
Punching the material by moving the punch in a shear direction to shear the material;
It is characterized by including.
Generally, when punching is performed, the finishing process of the shearing part is required, which increases the process and costs. However, the punching process by heating the punch smoothly shears the shearing part. And finishing is no longer necessary. In addition, since only the punch is heated, it is not necessary to consider thermal expansion other than the punch, and high-accuracy punching can be performed. That is, high-precision machining can be performed by a single punching process, and the machining accuracy can be increased while maintaining productivity.
In particular, when the material to be punched is a laminated material, there are a hard portion and a soft portion, and whitening of the sheared portion may occur due to peeling during shearing, but by heating the punch, Since the deformation of the resin easily follows the deformation of the glass during shearing, it is possible to prevent peeling. And processing accuracy can be raised, suppressing whitening and maintaining productivity.

Further, in the punching method according to the present invention, heating the punch includes checking whether the punch is at a predetermined temperature or more and punching the material when the punch is at a predetermined temperature or more. It is characterized by including these.
By doing so, punching can be performed in consideration of the transition temperature of the material, so that whitening can be reliably suppressed, and the processing accuracy can be increased while maintaining productivity.

Further, in the punching method according to the present invention, heating the punch includes attaching a heater to the blade edge of the punch, and removing the heater from the blade edge of the punch when the punch is at a predetermined temperature or higher. Punching out the material.
By doing so, only the cutting edge of the punch is heated, so that it is possible not to heat unnecessary portions. And while suppressing the thermal expansion of the other location by a heat | fever, the apparatus for removing heat is unnecessary or it can be set as a small apparatus even if it is required.

In the punching method according to the present invention, heating the punch may include heating by a heater inserted in the punch.
By doing in this way, since only a punch is heated, it can be considered not to heat an unnecessary part. Further, since the heater is provided inside the punch, it is not necessary to remove the heater during the punching operation, and the punching operation can be performed efficiently.

In order to achieve the above object, the punching method according to the present invention includes:
Heating a punch that punches material with shear force between the dies;
Moving the punch in a shear direction to shear the material and contacting the material;
Moving the punch in a direction opposite to the shear direction;
Punching the material by moving the punch in the shear direction;
It is characterized by including.
By doing so, since the heated punch is brought into contact with the material to heat the material itself, it is possible to prevent the laminated material from being peeled off. Further, since the material to be punched can be easily heated, it is possible to suppress the whitening without increasing the heat of the material and to increase the processing accuracy while maintaining high productivity.

Generally, when punching is performed, the finishing process of the shearing part is required, which increases the process and costs. However, the punching process by heating the punch smoothly shears the shearing part. And finishing is no longer necessary. In addition, since only the punch is heated, it is not necessary to consider thermal expansion other than the punch, and high-accuracy punching can be performed. That is, high-precision machining can be performed by a single punching process, and the machining accuracy can be increased while maintaining productivity.
In particular, when the material to be punched is a laminated material, there are a hard portion and a soft portion, and whitening of the sheared portion may occur due to peeling during shearing, but by heating the punch, Since the deformation of the resin easily follows the deformation of the glass during shearing, it is possible to prevent peeling. And processing accuracy can be raised, suppressing whitening and maintaining productivity.

It is the 1st front view of punching device 1 in this embodiment. It is a side view of the punching apparatus 1 in this embodiment. It is a 2nd front view of the punching apparatus 1 in this embodiment. It is a 3rd front view of punching device 1 in this embodiment. It is the elements on larger scale of the punching apparatus in 1st Embodiment. It is explanatory drawing of the heating mechanism which heats a punch. It is the elements on larger scale of the punching apparatus in 2nd Embodiment. It is the 1st explanatory view of the punching procedure in a 3rd embodiment. It is the 2nd explanatory view of the punching procedure in a 3rd embodiment. It is the 3rd explanatory view of the punching procedure in a 3rd embodiment. It is the 4th explanatory view of the punching procedure in a 3rd embodiment.

  Hereinafter, the punching device 1 in the present embodiment will be described. In the drawings used for explanation, the X-axis direction, the Y-axis direction, and the Z-axis direction are shown, respectively, so that the attachment position and the moving direction of each part can be understood by these illustrations. . Since the punching device 1 is frequently used to describe the vertical movement of the punch or the like, the positive direction of the Z-axis is the upward direction and the negative direction is the downward direction unless otherwise specified.

  FIG. 1 is a first front view of a punching device 1 according to the present embodiment. FIG. 2 is a side view of the punching device 1 in the present embodiment. Hereinafter, an outline of the punching device 1 in the present embodiment will be described with reference to FIGS. 1 and 2.

  The punching device 1 generally includes a part responsible for the movement of the upper die 10 that moves up and down together with the punch 31, a part responsible for the movement of the stripper 32 that presses the material when punching, and a die punched product including the die 33. It consists of a lower mold part.

  First, a mechanism for moving the stripper 32 will be described. The mechanism for moving the stripper 32 mainly includes a stripper driving servomotor 51, a lifting guide mechanism 52, a ball screw unit 53, a connecting portion 54, and a connecting member 56.

  The stripper driving servomotor 51 is fixed to a pedestal 72. Then, the stripper driving servomotor 51 generates a rotational driving force on its output shaft in response to a command from the operation panel 71. The output shaft of the stripper driving servomotor 51 is connected on the same axis to the screw shaft 531 of the ball screw unit 53 via the connecting member 56 to rotate the screw shaft 53.

  The rotational force of the screw shaft 53 moves the outer cylinder (nut) 532 in the vertical direction (Z-axis direction) in the ball screw unit 53. The outer cylinder 532 moves the elevating shaft 521 of the elevating guide mechanism 52 through the connecting portion 54 in the longitudinal direction of the axis (Z-axis direction). The lift shaft 521 is restricted from moving in the X-axis direction and the Y-axis direction by the bearing 522 and is moved only in the Z-axis direction. The stripper plate 20, the load cell 551, and the bush plate 552 are fixed to the end of the elevating shaft 521.

  The stripper plate 20 is restricted in movement in the X-axis direction and the Y-axis direction by the bearing 522, and is also moved by an inner guide post 64 (indicated by a broken line in FIG. 2 to improve the visibility of other parts). Is restricted only in the Z-axis direction, and movement in the Z-axis direction is possible precisely.

  As a result, when the stripper drive servomotor 51 is rotated, the rotational force is converted into a drive force in the vertical direction (Z-axis direction) by the ball screw unit 53 and attached to the lifting guide mechanism via the connecting portion 54. The stripper plate 20 is moved up and down. A stripper 32 is attached to the stripper plate 20, and the material is sandwiched together with the die 33 during the punching operation.

  Next, a mechanism for moving the upper mold 10 will be described. The mechanism for moving the upper mold 10 is substantially the same as the above-described stripper moving mechanism using the ball screw unit. The mechanism for moving the upper mold 10 includes an upper mold drive servo motor 61, a gear box 62, a ball screw unit 66, a connecting portion 67, a lifting guide mechanism 68, and a connecting member 69.

  The upper mold drive servomotor 61 is fixed to the upper portion of the punching device 1 in this embodiment. Then, in response to a command from the operation panel 71, the upper mold drive servomotor 61 generates a rotational drive force on its output shaft. The output shaft of the upper mold drive servomotor 61 rotates the connecting member 69 connected to the screw shaft 661 of the ball screw unit 66 via the gear box 62. The connecting member 69 can rotate on the same axis as the screw shaft 661. When the connecting member 69 is rotated, the screw shaft 661 is also rotated.

  The rotational force of the screw shaft 661 moves the outer cylinder (nut) 662 in the vertical direction (Z-axis direction) in the ball screw unit 66. The outer cylinder 662 moves the elevating shaft 681 of the elevating guide mechanism 68 through the connecting portion 67 in the longitudinal direction of the axis (Z-axis direction). The lift shaft 681 is restricted from moving in the X-axis direction and the Y-axis direction by a bearing 682 and is moved only in the Z-axis direction. A press ram 65 is fixed to the end of the elevating shaft 681, and an upper die set 14 and a punch plate 13 constituting the upper die 10 are attached to the tip of the press ram 65. A punch 31 is fixed to the punch plate 13.

  As a result, when the upper mold driving servo motor 61 is rotated, the rotational force is converted into a driving force in the vertical direction (Z-axis direction) by the gear in the gear box 62 and the ball screw unit 66, and is transmitted via the press ram 65. The upper mold 10 is moved up and down.

  Next, the structure of the lower mold 40 will be described. The lower die 40 includes a die plate 43, a lower backing plate 44, a lower die set 45, and a base 46. An air cylinder 81, a rocker arm 82, a knockout 84, and a knockout holder 85 are incorporated in the lower mold 40.

  Knockout 84 has the function of receiving the material to be punched. The engaging portion provided at the lower portion of the knockout 84 engages with the engaging portion provided at the upper portion of the knockout holder 85, and the knockout 84 is moved in the vertical direction (Z-axis direction) so as to follow the operation of the knockout holder 85. Move to. The knockout 84 and the knockout holder 85 are engaged with each other with some play in the vertical direction.

  The knockout holder 85 includes a spring inside thereof, thereby generating a predetermined reaction force on the upper portion of the knockout holder 85. Thereby, when the punch 31 punches the material, the knockout 84 at the upper part of the knockout holder 85 also receives the material being punched with a predetermined reaction force.

  The knockout holder 85 is movable in the vertical direction by the operation of the rocker arm 82 and the rod 811 of the air cylinder 81. When the knockout holder 85 moves to the lowest point, the knockout 84 also moves to the lowest point. The lower mold 40 has a collection port 88 for collecting the punched product at the lowest point of the knockout 84. By adopting such a configuration, the product can be recovered from the recovery port 88 after the punched product is released downward in the lower mold 40.

  Further, the punching device 11 includes an operation panel 71 for operating these and an emergency stop button 73 for emergency stopping these operations. In addition, a proximity sensor 74 for detecting the movement limit of the stripper plate 20 in the vertical direction is provided.

  FIG. 3 is a second front view of the punching device 1 in the present embodiment. FIG. 4 is a third front view of the punching device 1 in the present embodiment. The operation of the punching device 1 according to the present embodiment will be described with reference to these drawings and FIG. 1 described above.

  First, as shown in FIG. 1, the upper die 10 including the punch 31 is moved to the top dead center during the punching operation, and the stripper plate 20 including the stripper 32 is also moved to the top dead center during the punching operation. In the state, the material to be punched is placed on the die 33.

  Next, the stripper driving servomotor 51 is operated, and the stripper plate 20 is lowered (Z-axis minus direction). The stripper plate 20 is moved to a position just before contacting the die plate 43, and the material is sandwiched between the stripper 32 and the die 33 (FIG. 3).

  When the material is sandwiched between the stripper 32 and the die 33 and the material is securely fixed, the upper mold driving servo motor 61 is then operated, and the upper mold 10 is lowered (Z-axis minus direction). The die 31 fixed to the upper die 10 is also lowered at the same time, passes through the hollow portion of the stripper 32 as it is, and the material is punched out by a shearing force with the die 33. The punched material is received by knockout 84. (Fig. 4)

  FIG. 5 is a partially enlarged view of the punching device in the first embodiment. In the first embodiment described below, the blade tip of the punch 31 is heated to a predetermined temperature by a removable heater 92, and the material is punched by the punch 31 after heating.

  FIG. 5 shows a heater 92, a heating plate 93, a heat insulating plate 94, a temperature sensor 95, and an arm 91. These detailed configurations will be described later with reference to FIG. 6. With such an arrangement, the blade 92 of the punch 31 is heated by the heater 92.

  After heating in this way, the heater 92 is removed, and the punch 31 and the stripper 32 are moved to the position shown in FIG. The material is then placed on the die 33 and the stripper 32 is lowered as shown in FIG. The stripper 32 sandwiches the material together with the die 33, and the fixing of the material is completed. Thereafter, the upper die 10 is lowered and the material is punched by the punch 31 and the die 33.

  FIG. 6 is an explanatory diagram of a heating mechanism for heating the punch. The figure shown in the upper part of FIG. 6 is a top view of the heating mechanism, and the figure shown in the lower part is a side view of the heating mechanism. In the figure, an upper die set 14 and a bracket 96 attached to the upper die set 14 are shown. A punch 31 is attached to the upper die set 14 via a punch plate 13.

  Further, the drawing shows a heater 92 included in the heating mechanism, and a heating plate 93 that houses the heater 92 and indirectly heats the blade edge of the punch 31. Further, a heating plate 93 is attached so as to sandwich the heat insulating plate 94 in an arm 91 (hatched to distinguish from the bracket 96) that is hung on the bracket 96 described above. A temperature sensor 95 is provided inside the heating plate 93. The temperature information output from the temperature sensor 95 is input to a control unit (not shown). The control unit controls the temperature of the heater 92 based on the temperature information.

  The reason why the heat insulating plate 94 is provided between the heating plate 93 and the arm 91 is to prevent the heating of the heating plate 93 from unnecessarily heating the arm 91. The arm 91 is provided with hooking claws 911 and 912. One hooking claw 911 is hooked on the bracket 96. The other hook claw 912 is hooked on a part of the upper surface of the upper die set 14. In this way, the heating plate 93 attached to the arm 91 comes into contact with the blade edge of the punch 31 and heats the blade edge.

  The hook claw 912 is provided with a screw hole for fixing to the upper die set 14 to prevent the arm 91 from dropping during heating.

  Naturally, the arm 91 can be removed from the bracket 96 and the upper die set 14 as shown by the broken line in the figure, and is removed except when the tip of the punch 31 is heated.

  Thus, by using the heater 92 provided on the arm 91, the cutting edge of the punch 31 is heated, and when punching, the arm 91 is removed to complete the heating of the punch 31, and the punch 31 is heated. The material can be punched in the state.

  FIG. 7 is a partially enlarged view of the punching device in the second embodiment. In the first embodiment described above, as shown in FIG. 6, the heating plate 93 is in contact with the blade edge of the punch 31 and indirectly heats the punch 31, but in the second embodiment, the punch 31 ′ A heater 92 ′ and a temperature sensor 95 ′ are provided inside.

  Thus, having the heater 92 ′ and the temperature sensor 95 ′ inside the punch 31 ′ has an advantage that it is not necessary to attach and remove the arm 91 every time the material is punched.

  In the case of the second embodiment, the punch 31 and the stripper 32 are moved to the positions shown in FIG. 1 by the temperature sensor 95 ′ and a control unit (not shown) while the punch 31 ′ is maintained at a predetermined temperature. The material is then placed on the die 33 and the stripper 32 is lowered as shown in FIG. The stripper 32 sandwiches the material together with the die 33, and the fixing of the material is completed. Thereafter, the upper mold 10 is lowered, and the material is punched by the punch 31 and the die 33.

  By the way, in the first embodiment and the second embodiment described above, the operation of punching the material is performed immediately after the heating of the punch is completed. In the third embodiment described below, there is a step of bringing the heated punch into contact with the material M once. Hereinafter, this procedure will be described with reference to FIGS.

  FIG. 8 is a first explanatory view of a punching procedure in the third embodiment. In this figure, the heating process of the punch 31 is shown. In the heating process of FIG. 8, as described with reference to FIGS. 5 and 6, the heater 92 is attached to the tip of the punch 31, and the cutting edge of the punch 31 is heated to a predetermined temperature.

  FIG. 9 is a second explanatory diagram of a punching procedure in the third embodiment. This drawing shows a contact process in which the punch 31 is brought into contact with the material. In the contact process of FIG. 9, the heated punch 31 is lowered and the cutting edge of the punch 31 is brought into contact with the surface of the material M to be punched. In the contact process, the punching of the material M by the punch 31 is not performed. In this step, the punch 31 contacts the material for a predetermined time to heat the material M.

  FIG. 10 is a third explanatory diagram of a punching procedure in the third embodiment. This drawing shows a pulling process for pulling the punch 31 away from the material M at one end. 10, the punch 31 is raised and the heating of the material M is completed. The punch 31 is raised in this way in order to complete the heating of the material M and punch the material M with inertia in the next punching step.

  FIG. 11 is a fourth explanatory diagram of a punching procedure in the third embodiment. This drawing shows a punching process in which the punch 31 punches the material M together with the die 33. In the punching process of FIG. 11, the punch 31 is lowered from the top dead center at once, and the material M is punched.

  As described above, according to the first to third embodiments, only the punch 31 is locally heated to punch out the material, so that heat is transferred to the material at the time of shearing. Is done. This eliminates the need for finishing. Moreover, since only the punch 31 is heated, it is possible to perform punching with high accuracy from the point that it is not necessary to consider thermal expansion other than the punch 31 in the punching apparatus 1.

  In particular, when the material to be punched is a material such as laminated glass epoxy, since a hard portion and a soft portion are laminated, a so-called whitening phenomenon is likely to occur due to peeling of both during shearing. However, according to the first to third embodiments, by heating the punch 31, the deformation of the resin can follow the deformation of the glass at the time of shearing, thereby suppressing the occurrence of peeling. Can do. And processing precision can be raised, suppressing whitening and maintaining high productivity.

1 punching device,
10 Upper die, 13 Punch plate, 14 Upper die set,
20 stripper plate,
31 punches, 32 strippers, 33 dies,
40 Lower mold, 43 Die plate, 44 Lower backing plate,
45 Lower die set, 46 base, 47 press table,
51 Stripper drive servo motor,
52 Lifting guide mechanism, 521 Lifting shaft, 522 Bearing,
53 ball screw unit, 531 screw shaft, 532 outer cylinder (nut),
54 connecting part, 541 connecting member, 542 main arm,
551 Load cell, 552 Bush plate, 56 Connecting member,
61 Servo motor for upper mold drive, 62 Gear box,
63 Inner guide bush, 64 Inner guide post, 65 Press ram,
66 Ball screw unit, 661 screw shaft, 662 outer cylinder (nut),
67 connecting part, 671 connecting member, 672 main arm,
68 Lifting guide mechanism, 681 Lifting shaft, 682 Bearing,
69 connecting members,
71 Operation panel, 72 Mounting base, 73 Emergency stop button, 74 Proximity sensor 81 Air cylinder, 811 Rod,
82 rocker arms, 84 knockouts,
85 knockout holder, 88 collection port,
91 arm, 911 hook claw, 912 hook claw,
92 heaters, 93 heating plates, 94 heat insulation plates,
95 temperature sensor, 96 bracket,
M material,

Claims (5)

Heating a punch that punches material with shear force between the dies;
Punching the material by moving the punch in a shear direction to shear the material;
Including punching method. Heating the punch
Checking if the punch is above a predetermined temperature;
Punching the material when the punch is above a predetermined temperature;
The punching method according to claim 1, comprising: Heating the punch
Attaching a heater to the blade edge of the punch;
Removing the heater from the blade edge of the punch when the punch is above a predetermined temperature, and punching the material;
The punching method according to claim 2, comprising:   The punching method according to claim 1 or 2, wherein heating the punch includes heating by a heater inserted in the punch. Heating a punch that punches material with shear force between the dies;
Moving the punch in a shear direction to shear the material and contacting the material;
Moving the punch in a direction opposite to the shear direction;
Punching the material by moving the punch in the shear direction;
Including punching method.

Images