Rotary punch unit

Abstract

To provide a rotary punch unit which has a corresponding practicality and suppresses the deposition of chips onto a flat material (piercing target material) and their penetration into the rotary punch unit or an accessory device.SOLUTION: This invention relates to a rotary punch unit, which is a rotary punch unit where a meshing part constituted of the cutting blade of a die provided on a first shaft rotating in one direction and the cutting blade of a punch provided on a second shaft synchronously rotating in parallel with the axial direction of the first shaft and in a reverse direction to the first shaft, while moving from a meshing start point to a meshing finish point, forms a first semicircular section line around one and a second semicircular section line around the other to form a hole by cutting chips out of a flat material having supplied between the die and the punch, thereby cutting out the chips connecting first to three points with respect to the flat material at a position matching first to three recesses provided in either of the cutting blade of the die or the cutting blade of the punch.SELECTED DRAWING: Figure 10

Description

[Technical field]

[0001] The present invention relates to a rotary punch unit. [Background technology]

[0002] Conventionally, a rotary punch unit is used to punch a circular hole in a flat material (a material to be punched) being conveyed. For example, the rotary punch unit disclosed in Patent Document 1 can punch a circular hole in a flat material supplied between a die provided on a first shaft rotating in one direction and a punch provided on a second shaft parallel to the axial direction of the first shaft and rotating in the opposite direction to the first shaft. In this rotary punch unit, the cutting blade of the die and the cutting blade of the punch form an engagement portion while rotating synchronously, and the engagement portion moves from the punching start point (engagement start point) of the circular hole to the punching end point (engagement end point). Due to the movement of the engagement portion, a circular chip (a punched piece) is cut out from the flat material, and a circular hole corresponding to the chip is formed in the flat material. The chip cut out and separated from the flat material falls through a discharge hole provided downward from the cutting blade of the die. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 4390404 Summary of the Invention [Problem to be solved by the invention]

[0004] As described above, when a circular hole is formed in a flat material by the rotary punch unit, chips are generated, and the chips fall from the discharge hole continuing downward from the cutting edge of the die. Usually, the chips that fall are discharged directly to the outside of the device, or are temporarily stored in a dedicated space in the device and then discharged together. However, some chips do not fall smoothly downward from the cutting edge of the die. Some chips that do not fall smoothly may fall during transportation and adhere to the surface of the flat material. In such a case, the chips that adhere to the flat material may cause quality problems in the flat material or products using the flat material. Some chips that do not fall from the discharge hole may enter the rotary punch unit or ancillary devices, causing equipment failure.

[0005] The object of the present invention is to provide a rotary punch unit which has a reasonable level of practicality and which prevents chips (punch pieces) from adhering to the flat material (the material being punched) and from entering the rotary punch unit or associated equipment. [Means for solving the problem]

[0006] The inventors closely observed the process of forming circular chips cut from a flat material, and closely examined and considered the minute changes in behavior of the meshing portion formed by the cutting edge of the die and the cutting edge of the punch as it moves from the punching start point of the circular hole (meshing start point) to the punching end point (meshing end point).The inventors then came up with the idea of ​​forming the chips in a shape that makes them easy to separate from the flat material and carrying them out of the device together with the flat material, and through further ingenuity, they found a configuration for stably and reliably connecting the chips to the flat material, which led to the invention.

[0007] This invention is a rotary punch unit in which an interlocking portion formed by the cutting edge of a die provided on a first shaft rotating in one direction and the cutting edge of a punch provided on a second shaft parallel to the axial direction of the first shaft and rotating synchronously in the opposite direction to the first shaft forms a semicircular first cutting line around one side and a semicircular second cutting line around the other side as the interlocking portion moves from the start point to the end point, and cuts out chips from a flat material supplied between the die and the punch to form a circular hole, the rotary punch unit cutting out the chips which are connected to the flat material at one to three points at positions corresponding to one to three recesses provided on either the cutting edge of the die or the cutting edge of the punch.

[0008] The rotary punch unit of the present invention can cut out the chips, which are connected to the flat material at one point, at a position corresponding to the recess provided in any one of the following locations (1-1), (1-2), and (1-3). (1-1) A point corresponding to the end point of engagement of either the cutting edge of the die or the cutting edge of the punch (1-2) A point corresponding to any one point on the first cutting line within an angle range of preferably 30 degrees or more and 100 degrees or less, more preferably 30 degrees or more and 90 degrees or less, from the meshing start point of either the cutting edge of the die or the cutting edge of the punch to the meshing end point around the center point of the circular hole in one direction. (1-3) A point corresponding to any one point on the second cutting line within an angle range of preferably 30 degrees or more and 100 degrees or less, more preferably 30 degrees or more and 90 degrees or less, around the other of the center point of the circular hole from the meshing start point of either the cutting edge of the die or the cutting edge of the punch toward the meshing end point.

[0009] The rotary punch unit of the present invention can cut out the chips that are connected to the flat material at two points at positions corresponding to the recesses provided in two places by any one of the following (2-1), (2-2), and (2-3). (2-1) A combination of a location corresponding to an end point of meshing of either the cutting edge of the die or the cutting edge of the punch, and a location corresponding to any one point on the first cutting line within an angle range of preferably 30 degrees or more and 100 degrees or less, more preferably 30 degrees or more and 90 degrees or less, in one direction around the center point of the circular hole from the start point of meshing of either the cutting edge of the die or the cutting edge of the punch toward the end point of meshing. (2-2) A combination of a location corresponding to an end point of engagement of either the cutting edge of the die or the cutting edge of the punch, and a location corresponding to any one point on the second cutting line within an angle range of preferably 30 degrees or more and 100 degrees or less, more preferably 30 degrees or more and 90 degrees or less, around the other of the center point of the circular hole from the start point of engagement of either the cutting edge of the die or the cutting edge of the punch toward the end point of engagement. (2-3) A combination of a location corresponding to any one point on the first cutting line within an angle range of preferably 30 degrees or more and 100 degrees or less, more preferably 30 degrees or more and 90 degrees or less, around the center point of the circular hole from the meshing start point of either the cutting edge of the die or the cutting edge of the punch toward the meshing end point, and a location corresponding to any one point on the second cutting line within an angle range of preferably 30 degrees or more and 100 degrees or less, more preferably 30 degrees or more and 90 degrees or less, around the center point of the circular hole from the meshing start point of either the cutting edge of the die or the cutting edge of the punch toward the meshing end point,

[0010] The rotary punch unit according to the present invention can cut out the chips, which are connected to the flat material at three points, at positions corresponding to the recesses provided in three places by the following (3-1). (3-1) A combination of a location corresponding to an end point of meshing of either the cutting edge of the die or the cutting edge of the punch, a location corresponding to any one point on the first cutting line within an angle range of preferably 30 degrees or more and 100 degrees or less, more preferably 30 degrees or more and 90 degrees or less, around the center point of the circular hole from the start point of meshing of either the cutting edge of the die or the cutting edge of the punch toward the end point of meshing, and a location corresponding to any one point on the second cutting line within an angle range of preferably 30 degrees or more and 100 degrees or less, more preferably 30 degrees or more and 90 degrees or less, around the center point of the circular hole from the start point of meshing of either the cutting edge of the die or the cutting edge of the punch toward the end point of meshing.

[0011] The rotary punch unit of the present invention may be configured so that, when the inner diameter of the cutting edge of the die is Dd and the outer diameter of the cutting edge of the punch is Dp, the relationship 0 mm≦Dd-Dp≦0.005 mm is satisfied, and the cutting edge of the die and the cutting edge of the punch are pressed together at the start of meshing, and so that, when the radius of rotation of the cutting edge of the die is Rd and the radius of rotation of the cutting edge of the punch is Rp, the relationship Rd-Rp>0 mm is satisfied, and the cutting edge of the die and the cutting edge of the punch are pressed together at the end of meshing.

[0012] The rotary punch unit according to the present invention may be configured to satisfy the relationship: 0.10 mm≦(Rd−Rp)≦0.40 mm.

[0013] The rotary punch unit of the present invention may be configured so that when the cutting edges of the die and the cutting edges of the punch are in pressure contact at the start point of engagement, the angle formed by a line segment connecting the start point of engagement of the cutting edges of the die and the center of rotation of the die, and a line segment connecting the center of rotation of the die and the center of rotation of the punch, satisfies the relationship 0 degrees < α ≦ 15 degrees, where α is the angle.

[0014] The rotary punch unit of the present invention may be configured so that, when the angle that the cutting edges of the die make between the start point of engagement and the end point of engagement with the center of rotation of the die is β (radian), the relationship satisfies 0.02 mm≦(Rd-Rp)·β≦0.10 mm. Effect of the Invention

[0015] According to the present invention, it is possible to provide a rotary punch unit which has a reasonable level of practicality and which prevents chips (punch pieces) from adhering to the flat material (material to be punched) and from entering the rotary punch unit or associated equipment. [Brief description of the drawings]

[0016] [Figure 1] FIG. 1 is a diagram (front view) showing a schematic configuration example of a rotary punch unit suitable for use in the present invention. [Diagram 2] FIG. 1 is a diagram (a side view including a partial cross section) showing a schematic configuration example of a rotary punch unit suitable for use in the present invention. [Diagram 3] FIG. 2 is a schematic diagram for explaining the positional relationship between a die and a punch and a flat material (material to be punched) in an example of the configuration of a rotary punch unit suitable for use in the present invention. [Figure 4] FIG. 2 is a schematic diagram for explaining the meshing between the cutting edges of the die and the cutting edges of the punch in an example configuration of a rotary punch unit suitable for use in the present invention. [Diagram 5] 1 is a schematic diagram for explaining the starting point of engagement between the cutting edges of the die and the punch in an example configuration of a rotary punch unit suitable for use in the present invention; FIG. [Figure 6] 6 is an enlarged schematic view showing the vicinity of the meshing start point shown in FIG. 5. FIG. [Figure 7] FIG. 1 is a schematic diagram for explaining the end point of engagement between a die and a punch in an example of the configuration of a rotary punch unit suitable for use in the present invention. [Figure 8]8 is an enlarged schematic view showing the vicinity of the end point of engagement between the die and the punch shown in FIG. 7. FIG. [Figure 9] This is a reference diagram showing a schematic configuration of the meshing end point to explain the difference from the configuration shown in Fig. 8. In order to simplify the comparison with the configuration shown in Fig. 8, the names and reference characters of each part are the same as those in Fig. 8. [Figure 10] 2 is a diagram showing an example of a partial configuration of a die cutting edge (hole) in a rotary punch unit according to the present invention, the diagram being a schematic view of the die cutting edge (hole) from the side opposite the die cutting edge (hole). FIG. [Figure 11] 1 is a diagram showing an example of a partial configuration of a cutting edge (convex portion) of a punch in a rotary punch unit according to the present invention, the diagram being a schematic view of the cutting edge (convex portion) of the punch from the perspective of the side facing the cutting edge (convex portion) of the punch. FIG. [Figure 12] This is an example of the partial structure of a flat material when a circular hole (chip) is formed by the rotary punch unit of this invention, and is a schematic diagram showing the circular hole (chip) of the flat material, with the viewpoint on the punch side corresponding to the cutting edge of the die. [Figure 13] FIG. 13 is a diagram showing a geometric model of a simulation performed to set an appropriate position (angle) for providing a recess. [Figure 14] Difference Xdp for evaluation conditions 1 to 18 1 is a diagram (graph) showing the above. [Figure 15] Difference Ydp for evaluation conditions 1 to 18 1 is a diagram (graph) showing the above. [Figure 16] For evaluation conditions 1 to 9, the rotation angle θp Difference Ydp 1 is a diagram (graph) showing the above. [Figure 17] For evaluation conditions 10 to 18, the rotation angle θp Difference Ydp 1 is a diagram (graph) showing the above. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] Prior to the description of the embodiment of the rotary punch unit according to the present invention, a configuration example of a rotary punch unit suitable for use with the present invention will be given and described with reference to the drawings as appropriate. Next, the embodiment of the rotary punch unit according to the present invention will be described with reference to the drawings as appropriate, taking as an example a case where the rotary punch unit is used in the above configuration example. The configuration of the rotary punch unit according to the present invention is not limited to the configuration of the embodiment exemplified here, but is indicated by the claims, and it is appropriate to interpret that all modifications within the meaning and scope equivalent to the claims are included. The names, signs, and symbols of the parts constituting the rotary punch unit may be shared in the description of the specification and drawings unless otherwise specified. For example, the symbol of the meshing start point corresponding to the punching start point is written as P1 and shared with the punching start point, and the symbol of the meshing end point corresponding to the punching end point is written as P2 and shared with the punching end point.

[0018] First, a representative example of the configuration of a rotary punch unit suitable for use in the present invention will be given and described with reference to Figs. 1 to 8 as appropriate.

[0019] The rotary punch unit 1 (punch unit 1) shown in Fig. 1 to Fig. 8 is configured to satisfy the relationship 0 mm ≦ Dd - Dp ≦ 0.005 mm, as described later. With this configuration, the punch unit 1 can form circular holes in a punched material (flat material S) made of not only paper or resin but also nonwoven fabric, metal foil, or rubber. The punch unit 1 can form circular holes in a punched material (flat material S) made of a relatively soft material, such as plain paper, photographic paper, and other papers having a thickness of 0.01 mm to 2 mm, soft resins such as X-ray imaging films having a thickness of 0.02 mm to 2 mm, fabrics such as nonwoven fabric, cloth, and felt having a thickness of 0.01 mm to 2 mm, and soft rubbers such as conductive sheets having a thickness of 0.02 mm to 2 mm. The punch unit 1 can form circular holes in a workpiece (flat material S) made of a relatively hard material, such as relatively soft metal foils such as copper foil or aluminum foil, which have a thickness of 0.01 mm or more and 1 mm or less, or hard resins such as conductive substrates and semiconductor substrates, which have a thickness of 0.01 mm or more and 1 mm or less.

[0020] 1 and 2, the punch unit 1 has a die 10 arranged on the lower side (Z2 side) of the flat material S, and a punch 20 arranged on the upper side (Z1 side) of the flat material S. It also has a first shaft 11 equipped with the die 10 and rotating in one direction (Q1 direction), and a second shaft 21 equipped with the punch 20 and rotating parallel to the axial direction (Y direction) of the first shaft 11 and in the opposite direction (Q2 direction) to the first shaft 11. As shown in FIG. 2, the flat material S to be punched is supplied to this punch unit 1 along the X direction and moves toward the X1 side.

[0021] In the punch unit 1, the first shaft 11 and the second shaft 21 are rotatably supported by a frame 14, and are configured to be parallel to each other along the Y direction, with an inter-shape distance Ldp as shown in FIG. 3. One end side (Y1 side) of the first shaft 11 is provided with a gear 12 and a scissors gear 13. One end side (Y1 side) of the second shaft 21 is provided with a gear 22. The gear 12 and the scissors gear 13 are connected to the gear 22 so as to minimize backlash. The other end side (Y2 side) of the first shaft 11 is connected to a driving source (not shown). The driving source can also be connected to the other end side (Y2 side) of the second shaft 21.

[0022] 3, during the piercing operation, the first shaft 11 equipped with the die 10 rotates in one direction (direction Q1) in synchronization with the second shaft 21 equipped with the punch 20. Meanwhile, the second shaft 21 equipped with the punch 20 rotates in the opposite direction (direction Q2) to the first shaft 11 equipped with the die 10 in synchronization with the first shaft 11 equipped with the die 10. Therefore, during the piercing operation, the first shaft 11 equipped with the die 10 and the second shaft 21 equipped with the punch 20 rotate synchronously in opposite directions to each other.

[0023] Here, the punching operation refers to the operation or state during which the meshing portion formed by the cutting edge 10a of the die 10 and the cutting edge 20a of the punch 20 moves from meshing start point P1 to meshing end point P2 to form a circular hole in the flat material S. The meshing start point P1 refers to the forward movement side (X1 side) where the preceding operation starts to punch (cut) the flat material S, and refers to the initial approaching point between the cutting edge 10a of the die 10 and the cutting edge 20a of the punch 20 (the point indicated by P1 in FIG. 5) or its vicinity (the interior surrounded by the two-dot chain line indicated by P1 in FIG. 6). In addition, the engagement end point P2 refers to the backward side (X2 side) where the drilling operation ends the drilling (cutting) into the flat material S, and refers to the final proximity point between the cutting edge 10a of the die 10 and the cutting edge 20a of the punch 20 (the point indicated by P2 in Figure 7) or its vicinity (the interior surrounded by the dotted line indicated by P2 in Figure 8).

[0024] While the die 10 and the punch 20 rotate synchronously in opposite directions, the cutting edge 10a of the die 10 and the cutting edge 20a of the punch 20 form an interlocking portion within a certain angular range within one rotation (360 degrees) as shown in Figures 4 to 8. While the interlocking portion moves from the interlocking start point P1 to the interlocking end point P2 corresponding to the certain angular range, a circular hole can be formed in the flat material S supplied between the die 10 and the punch 20.

[0025] Here, the term "engagement" refers to the operation or state during which the meshing portion, which is formed by the cutting edge 10a of the die 10 and the cutting edge 20a of the punch 20 contacting each other, moves from the meshing start point P1 to the meshing end point P2. During the meshing, the meshing portion cuts into the flat material S from the meshing start point P1 (see Figs. 5 and 6). Immediately after that, while the protruding portion of the punch 20 enters the hole of the die 10 (see Fig. 4) and overlaps (see Lz shown in Fig. 4), the two-way meshing portion cuts into the flat material S while drawing a semicircular trajectory around one side of the center point of the circular hole to form a first cutting line, and cuts into the flat material S while drawing a semicircular trajectory around the other side of the center point of the circular hole to form a second cutting line. Immediately after that, the two-way meshing portion join together at the meshing end point P2, and the cutting into the flat material S ends. Immediately after the meshing portion reaches meshing end point P2, the cutting edge 10a of the die 10 and the cutting edge 20a of the punch 20 separate, and the meshing portion is dissolved. During meshing, the meshing point P appears to move on the flat material S in response to the movement of the meshing portion. Immediately after departing from meshing start point P1, meshing point P is divided into two points: meshing point PA, which moves in one direction around the center point of the circular hole, and meshing point PB, which moves in the other direction, and returns to one point when it reaches meshing end point P2. Due to the above-mentioned movement of the meshing portion and meshing point P, circular chips are cut out from the flat material S, and a circular hole is formed in the flat material S.

[0026] In detail, at the meshing start point P1, the cutting edge 20a of the punch 20 cuts into the flat material S supported by the cutting edge 10a of the die 10 from the Z1 side. Then, the cutting edge 20a of the punch 20, which has instantly cut through the thickness of the flat material S, comes into contact with the cutting edge 10a of the die 10. At this time, the cutting edge 20a of the punch 20 that has cut into the flat material S and the cutting edge 10a of the die 10 that supports the flat material S come into contact while forming a corresponding meshing angle (shear angle), forming a contact portion. This contact portion is the meshing portion. While this contact portion and contact state are maintained from the meshing start point P1 to the meshing end point P2, the cutting edge 20a of the punch 20 cuts into the thickness of the flat material S from the Z1 side while having a corresponding meshing angle (shear angle) with respect to the cutting edge 10a of the die 10. Then, at the end point P2 of engagement, the cutting edge 20a of the punch 20 releases contact with the cutting edge 10a of the die 10 and moves away toward the Z1 side, exceeding the thickness of the flat material S, thereby eliminating the contact area and contact state formed with the cutting edge 10a of the die 10.

[0027] As shown in FIG. 4, the die 10 is a hole extending in a direction (Z direction) perpendicular to the axial direction (Y direction) of the first shaft 11, or a part having the hole. The hole of the die 10 is arranged so that the extension direction (Z direction) of the hole is perpendicular to the axial direction of the first shaft 11. At least on the opening side of the hole of the die 10, a cross section perpendicular to the extension direction of the hole is formed in a circular shape. For example, when the die 10 and the punch 20 are in a positional relationship in which their axial directions match during synchronous rotation (see FIG. 4), the direction perpendicular to the axial direction of the first shaft 11 and the extension direction of the hole of the die 10 correspond to the Z direction, the opening side of the hole of the die 10 corresponds to the Z1 side, and the cross section perpendicular to the extension direction of the hole of the die 10 corresponds to the XY cross section. Please note that the shapes and positional relationships of cutting edge 10a, cutting edge 20a, circumferential surface 15, gap C1, gap C2, overlap amount Lz, etc. shown in Figure 4 are shown schematic and exaggerated for the sake of clarity.

[0028] The outermost surface around the opening of the hole of the die 10 is a part of the circumferential surface (hereinafter referred to as the circumferential surface 15) located on the outermost rotation locus circle of the cutting blade 10a of the die 10 when the cutting blade 10a of the die 10 rotates with a rotation radius Rd around the axis Od of the first shaft 11. This rotation radius Rd is the rotation radius of the die 10 (hole). For simplicity, the circumferential surface 15 shown in each figure is drawn as a substantially straight line. The circumferential surface 15 of the cutting blade 10a of the die 10 can be mechanically formed with high precision, for example, by cylindrical grinding or cylindrical polishing centered on the axis Od. The edge 10b (see Figures 6 and 8) of the corner of the hole on the circumferential surface 15 of the die 10 is formed into a sharp, burr-free, approximately 90-degree angle. The sharp edge 10b of the hole in the circumferential surface 15 of the die 10 becomes the cutting edge 10a with which the cutting edge 20a of the punch 20 cuts into the flat material S engages. The cutting edge 10a of the die 10 is configured to be able to engage with the cutting edge 20a of the punch 20 at a specific timing during the punching operation.

[0029] As shown in FIG. 4, the punch 20 is a round bar-shaped protrusion extending in a direction (Z direction) perpendicular to the axial direction (Y direction) of the second shaft 21, or a part having the round bar-shaped protrusion. The protrusion of the punch 20 is arranged so that the protruding direction (Z direction) of the protrusion is perpendicular to the axial direction of the second shaft 21. At least at the tip side of the protrusion of the punch 20, the cross section perpendicular to the protruding direction of the protrusion is formed in a circular shape. For example, when the die 10 and the punch 20 are in a positional relationship in which their axial directions match during synchronous rotation (see FIG. 4), the direction perpendicular to the axial direction of the second shaft 21 and the protruding direction of the protrusion of the punch 20 correspond to the Z direction, the tip side of the protrusion of the punch 20 corresponds to the Z2 side, and the cross section perpendicular to the protruding direction of the protrusion of the punch 20 corresponds to the XY cross section.

[0030] The tip end surface of the round bar-shaped convex portion of the punch 20 is a part of the circumferential surface (hereinafter referred to as the circumferential surface 25) located on the outermost rotation locus circle of the cutting blade 20a of the punch 20 when the cutting blade 20a of the punch 20 rotates with a rotation radius Rp around the axis Op of the second shaft 21. This rotation radius Rp is the rotation radius of the punch 20 (convex portion). Note that the circumferential surface 25 shown in each figure may be drawn as a substantially straight line for simplicity. The circumferential surface 25 of the cutting blade 20a of the punch 20 can be mechanically formed with high precision, for example, by cylindrical grinding or cylindrical polishing centered on the axis Op. The edge 20b of the corner of the circumferential surface 25 of the convex portion of the punch 20 is formed into a sharp angular shape without burrs at approximately 90 degrees. The sharp edge 20b of the circumferential surface 25 of the convex portion of the punch 20 becomes the cutting blade 20a that cuts into the flat material S. The cutting edge 20a of the punch 20 is configured to be able to mesh with the cutting edge 10a of the die 10 at a specific timing during the punching operation.

[0031] During the punching operation, the cutting edge 10a of the die 10 and the cutting edge 20a of the punch 20 are in a positional relationship as shown in FIG. 4 while moving from the meshing start point P1 (X1 side) to the meshing end point P2 (X2 side). In this case, as shown in FIG. 4, gaps C1 and C2 are defined between the cutting edge 10a and the cutting edge 20a. The reason why these gaps C1 and C2 are defined is that, when the inner diameter of the cutting edge 10a (hole) of the die 10 is Dd and the outer diameter of the cutting edge 20a (convex portion) of the punch 20 is Dp, the relationship Dd-Dp≧0 mm is satisfied. These gaps C1 and C2 are necessary to ensure smooth meshing between the cutting edge 10a of the die 10 and the cutting edge 20a of the punch 20.

[0032] It is important that the punch unit 1 is configured so that the cutting edge 10a of the die 10 and the cutting edge 20a of the punch 20 are in an appropriate meshing state, taking into full consideration the possibility that gaps C1 and C2 may be formed due to the diameter difference between the cutting edge 10a of the die 10 and the cutting edge 20a of the punch 20 during the punching operation. For this purpose, it is particularly important to appropriately configure the positional relationship between the cutting edge 10a of the die 10 and the cutting edge 20a of the punch 20 at the meshing start point P1 and the meshing end point P2.

[0033] Specifically, when the inner diameter of the cutting edge 10a of the die 10 is Dd and the outer diameter of the cutting edge 20a of the punch 20 is Dp, the cutting edge 10a of the die 10 and the cutting edge 20a of the punch 20 satisfy the relationship 0 mm≦Dd-Dp≦0.005 mm, and are configured so that the cutting edge 10a of the die 10 and the cutting edge 20a of the punch 20 are pressed against each other at the starting point P1 of engagement.

[0034] In addition, when the radius of rotation of the cutting edge 10a of the die 10 is Rd and the radius of rotation of the cutting edge 20a of the punch 20 is Rp, the cutting edge 10a of the die 10 and the cutting edge 20a of the punch 20 satisfy the relationship Rd-Rp>0 mm, and are configured so that the cutting edge 10a of the die 10 and the cutting edge 20a of the punch 20 are pressed against each other at the engagement end point P2.

[0035] At this time, preferably, the cutting edge 10a of the die 10 and the cutting edge 20a of the punch 20 are configured to satisfy the relationship 0.10 mm≦(Rd−Rp)≦0.40 mm.

[0036] In addition, preferably, when the cutting edge 10a of the die 10 and the cutting edge 20a of the punch 20 are in a state of being pressed against each other at the meshing start point P1, the angle formed by a line segment connecting the meshing start point P1 of the cutting edge 10a of the die 10 and the axis Od of the first shaft 11 which is the center of rotation of the die 10 and a line segment connecting this axis Od and the axis Op of the second shaft 21 which is the center of rotation of the punch 20 is α, and the angle is configured to satisfy the relationship of 0 degrees < α ≦ 15 degrees.

[0037] In addition, preferably, when the angle that the cutting edge 10a of the die 10 makes with the meshing start point P1 and the meshing end point P2 with respect to the axis Od of the first shaft 11, which is the center of rotation of the die 10, is β (unit: radian), it is configured to satisfy the relationship 0.02 mm≦(Rd-Rp)·β≦0.10 mm.

[0038] By configuring the cutting edge 10a of the die 10 and the cutting edge 20a of the punch 20 to satisfy the relationship of 0 mm≦Dd-Dp≦0.005 mm, it is possible to suppress galling between the cutting edge 10a of the die 10 and the cutting edge 20a of the punch 20 that engage with each other. In a punch unit that does not satisfy this relationship, for example, when Dd-Dp<0 mm, the engagement is performed in a state of what is generally called an interference fit, and galling between the cutting edge 10a of the die 10 and the cutting edge 20a of the punch 20 is likely to occur, especially at the engagement start point P1. Therefore, the machining, assembly, and adjustment of each part that affects the engagement must be performed with extremely high precision, which may be undesirable in terms of productivity and low cost of the punch unit. In addition, when Dd-Dp>0.005 mm, the occurrence of galling at the engagement start point P1 is easily suppressed, but the gap C1 between the cutting edge 10a of the die 10 and the cutting edge 20a of the punch 20 becomes larger. As a result, problems such as folding or tearing of the flat material S are likely to occur not only at the start point P1 of the meshing but also from the start point P1 to the end point P2 of the meshing, which may be undesirable from the standpoint of the reliability of drilling holes in the flat material S and the quality of the circular holes formed in the flat material S.

[0039] In addition, by configuring the cutting edge 10a of the die 10 and the cutting edge 20a of the punch 20 to be in pressure contact with each other at the meshing start point P1, it is possible to reliably suppress the formation of a gap C1 that causes defects such as folding of the flat material S at the meshing start point P1. This makes it possible to easily suppress the occurrence of defects such as folding of the flat material S at the meshing start point P1. To configure the cutting edge 10a of the die 10 and the cutting edge 20a of the punch 20 to be in pressure contact with each other at the meshing start point P1, it is sufficient to adjust the cutting edge 10a of the die 10 and the cutting edge 20a of the punch 20 so that they are in pressure contact with each other at the meshing start point P1 when assembling the punch unit 1.

[0040] In addition, when Dd-Dp=0 mm, even if the cutting edge 10a of the die 10 and the cutting edge 20a of the punch 20 are not pressed against each other at the meshing start point P1, the gap C1 is not defined by design. However, not only the cutting edge 10a of the die 10 and the cutting edge 20a of the punch 20, but also the rotation mechanism system and the rotation control system related to the synchronous rotation of the die 10 and the punch 20 have variations in processing dimensions, mechanical rigidity, assembly accuracy, control accuracy, etc. Therefore, due to the influence of such variations, one or both of the cutting edge 10a of the die 10 and the cutting edge 20a of the punch 20 may escape from each other when meshing, and the gap C1 may be defined. Therefore, in order to reliably suppress the formation of the gap C1 at the meshing start point P1, the cutting edge 10a of the die 10 and the cutting edge 20a of the punch 20 are configured to be pressed against each other at the meshing start point P1.

[0041] The flat material S is perforated (cut) by the meshing of the cutting blade 10a of the die 10 and the cutting blade 20a of the punch 20, which rotate synchronously in opposite directions. When the flat material S is supplied to the punch unit 1, the circumferential surface 15 of the die 10 supports the flat material S from the Z1 side. In this state, the cutting blade 10a (hole) of the die 10 rotating in the Q1 direction approaches the flat material S from the Z1 side, and at the same time, the cutting blade 20a of the punch 20 rotating in the Q2 direction approaches the flat material S from the Z2 side. Then, the edge 10b of the hole which becomes the cutting edge 10a of the die 10 and the edge 20b of the convex portion which becomes the cutting edge 20a of the punch 20 reach (or are near) the meshing start point P1 and come into contact with the flat material S which is clamped from the thickness direction (Z direction), and meshing between the cutting edge 10a of the die 10 and the cutting edge 20a of the punch 20 begins at the meshing start point P1 shown in Figure 5.

[0042] Here, for the meshing start point, the case of the rotary punch unit disclosed in Patent Document 1 will be described for reference. In the rotary punch unit disclosed in Patent Document 1, the diameter difference between the cutting edge (hole) of the die and the cutting edge of the punch is set to "0 mm to the outer diameter of the cutting edge of the punch x 0.005 mm (excluding 0 mm)", and the clearance between the cutting edge of the die and the cutting edge of the punch at the meshing start point is set to "0 mm to the outer diameter of the cutting edge of the punch x (-0.005 mm) (excluding 0 mm)". Therefore, the cutting edge of the die and the cutting edge of the punch overlap on the meshing start point side. This overlap amount is larger than 0 mm, and when the outer diameter of the cutting edge of the punch is Dp, it is at most "-0.005 mm x Dp". Due to the occurrence of this overlap, the definition of a gap at the meshing start point is suppressed, and the cutting edge of the die and the cutting edge of the punch are pressed together.

[0043] In the punch unit 1 according to the present invention, at the engagement start point P1, the cutting edge 10a (circumferential surface 15 with the edge 10b of the hole) of the die 10 supports the flat material S from the Z2 side, and at the same time, the cutting edge 20a (edge ​​20b of the circumferential surface 25 of the convex portion) of the punch 20 presses and cuts the flat material S from the Z1 side. Since the cutting edge 10a of the die 10 and the cutting edge 20a of the punch 20 have a moderate overlap (see Lz shown in FIG. 4), the cutting edge 20a of the punch 20 (edge ​​20b of the circumferential surface 25 of the convex portion) penetrates the flat material S and enters the cutting edge 20a of the die 10 (hole with the edge 10b of the circumferential surface 15) as shown in FIG. At this time, the punch unit 1 is configured so that the cutting edge 10a of the die 10 and the cutting edge 20a of the punch 20 satisfy the relationship of 0 mm≦Dd-Dp≦0.005 mm, and the cutting edge 10a of the die 10 and the cutting edge 20a of the punch 20 are in pressure contact at the meshing start point P1. As a result, the punch unit 1 is configured so that the positional relationship between the cutting edge 10a of the die 10 and the cutting edge 20a of the punch 20 at the meshing start point P1 is appropriately configured, and the cutting edge 20a of the punch 20 is in contact with the cutting edge 10a of the die 10 (the edge 10b of the hole of the circumferential surface 15) without forming a gap C1, and further presses against each other. In this way, by putting the cutting edge 10a of the die 10 and the cutting edge 20a of the punch 20 in a pressure contact state at the meshing start point P1, the formation of the gap C1 can be reliably suppressed.

[0044] As described above, the meshing portion between the cutting edge 10a of the die 10 and the cutting edge 20a of the punch 20 in the punch unit 1 moves from the meshing start point P1 (X1 side) shown in Figures 5 and 6 toward the meshing end point P2 (X2 side) shown in Figures 7 and 8. During that time, the edge 10b of the hole that becomes the cutting edge 10a of the die 10 and the edge 20b of the protrusion that becomes the cutting edge 20a of the punch 20 form a meshing angle (shear angle) by meshing with overlap (Lz), and the flat material S is cut toward the Y2 side by the shear force generated by the meshing angle (shear angle). Then, the meshing portion between the cutting edge 10a of the die 10 and the cutting edge 20a of the punch 20 reaches the meshing end point P2 shown in Figures 7 and 8, as described above, and is released immediately thereafter.

[0045] Here, the overlap (Lz) between the cutting edge 10a of the die 10 and the cutting edge 20a of the punch 20 will be described. The overlap (Lz) is necessary to enable the engagement between the cutting edge 10a of the die 10 and the cutting edge 20a of the punch 20. The configuration with the overlap (Lz) is the same as the conventional one. Lz shown in FIG. 4 is the overlap amount between the cutting edge 10a of the die 10 and the cutting edge 20a of the punch 20. The overlap amount Lz is set with the direction (Z2 side) of entering the hole of the die 10 as the positive direction, and in addition to the material, thickness, and hardness (flexibility) of the flat material S, the punching diameter, the rotation radius Rd of the die 10, the rotation radius Rp of the punch 20, the separation length (axial distance Ldp) between the axis Od of the first shaft 11 and the axis Op of the first shaft 21, and the synchronous rotation speed of the die 10 and the punch 20, etc., taken into consideration as necessary. The overlap amount Lz is set so as to satisfy the relationship Lz > 0 mm, and preferably, so as to satisfy the relationship 0 mm < Lx ≤ 1.0 mm. Note that the punch unit 1 with an overlap satisfying the relationship Lz > 0 mm satisfies the relationship Ldp < Rd + Rp.

[0046] For example, when Lz = 0 mm, there is no overlap between the cutting edge 10a of the die 10 and the cutting edge 20a of the punch 20. Therefore, since the convex portion (cutting edge 20a) of the punch 20 does not enter the hole (cutting edge 10a) of the die 10, the cutting edge 20a of the punch 20 that has cut into the flat material S does not penetrate sufficiently, and it is difficult to form a through hole (circular hole) in the flat material S. Note that when Lz < 0 mm, there is no engagement at all between the cutting edge 10a of the die 10 and the cutting edge 20a of the punch 20, so the flat material S cannot be punched. Also, when Lz > 1 mm, jamming is likely to occur between the cutting edge 10a of the die 10 and the cutting edge 20a of the punch 20, so an excessive overlap amount Lz is wasteful. The jamming between the cutting edge 10a of the die 10 and the cutting edge 20a of the punch 20 is considered to be caused by the inner diameter Dd of the cutting edge 10a (hole) of the die 10, the outer diameter Dp of the cutting edge 20a (convex portion) of the punch 20, the synchronous rotation speed of the die 10 and the punch 20, and the angle at which the cutting edge 10a of the die 10 and the cutting edge 20a of the punch 20 enter the engagement start point P1, etc.

[0047] Furthermore, because the cutting edge 10a of the die 10 and the cutting edge 20a of the punch 20 have a moderate overlap (Lz), the portion of the cutting edge 20a of the punch 20 that comes into contact and presses against the cutting edge 10a of the die 10 (edge ​​10b of the circumferential surface 15 of the hole) can be the side surface 20c of the circumferential surface 25 of the convex portion, as shown in meshing start point P1 shown in Fig. 6 and meshing end point P2 shown in Fig. 8. A configuration in which the edge 20b of the circumferential surface 25 of the convex portion of the punch 20 comes into contact and presses against the cutting edge 10a of the die 10 can obtain a sufficient and reliable pressing state, compared to a configuration in which the edge 20b of the circumferential surface 25 of the convex portion of the punch 20 comes into contact and presses against the cutting edge 10a of the die 10.

[0048] When the engagement between the cutting edge 10a of the die 10 and the cutting edge 20a of the punch 20 moves from the engagement start point P1 (X1 side) to the engagement end point P2 shown in Figures 7 and 8, it is important to appropriately configure the positional relationship between the cutting edge 10a of the die 10 and the cutting edge 20a of the punch 20.

[0049] Specifically, as described above, when the radius of rotation of the cutting edge 10a of the die 10 is Rd and the radius of rotation of the cutting edge 20a of the punch 20 is Rp, the cutting edge 10a of the die 10 and the cutting edge 20a of the punch 20 satisfy the relationship Rd-Rp>0 mm, and are configured so that the cutting edge 10a of the die 10 and the cutting edge 20a of the punch 20 are in pressure contact with each other at the meshing end point P2. At this time, preferably, the cutting edge 10a of the die 10 and the cutting edge 20a of the punch 20 are configured so as to satisfy the relationship 0.10 mm≦(Rd-Rp)≦0.40 mm.

[0050] By configuring the cutting edge 10a of the die 10 and the cutting edge 20a of the punch 20 to satisfy the relationship Rd-Rp>0 mm, the cutting edge 10a of the die 10, which rotates synchronously and engages with each other, can rotate and move faster than the cutting edge 20a of the punch 20. In this configuration, the circumferential surface 15 on which the cutting edge 10a of the die 10 is located is located on the outermost rotation locus circle, and the radius of the outermost rotation locus circle of the cutting edge 10a of the die 10, which has a rotation radius of Rd, is Rd. In addition, when the angle formed by the meshing start point P1 of the cutting edge 10a of the die 10 and the meshing end point P2 of the cutting edge 10a of the die 10 with respect to the axis center Od of the first shaft 11, which is the rotation center of the die 10, is βd (unit: radian), the rotational movement distance of the cutting edge 10a of the die 10 on the outermost rotation locus circle of the cutting edge 10a of the die 10 is Rd·βd. βd corresponds to β shown in Fig. 4. Meanwhile, the circumferential surface 25 on which the cutting edge 20a of the punch 20 is located is located on the outermost rotation locus circle, and the radius of the outermost rotation locus circle of the cutting edge 20a of the punch 20 with a rotation radius of Rp is Rp. When the angle formed by the meshing start point P1 of the cutting edge 20a of the punch 20 and the meshing end point P2 of the cutting edge 20a of the punch 20 with respect to the axis Op of the second shaft 21 which is the center of rotation of the punch 20 is βp (unit: radian), the rotational movement distance of the cutting edge 20a of the punch 20 on the outermost rotation locus circle of the cutting edge 20a of the punch 20 is Rp·βp.

[0051] As a result, when the relationship Rd-Rp>0 mm is satisfied, the cutting edge 10a of the die 10 can be rotated and moved longer than the cutting edge 20a of the punch 20 by Rd·βd-Rp·βp while the cutting edge 10a of the die 10 and the cutting edge 20a of the punch 20 rotate synchronously from the meshing start point P1 to the meshing end point P2. Then, the cutting edge 10a of the die 10 can be pressed against the cutting edge 20a of the punch 20 without forming a gap C2 at the meshing end point P2.

[0052] From another point of view, the cutting edge 10a of the die 10 and the cutting edge 20a of the punch 20, which are configured to satisfy the relationship Rd-Rp>0 mm, satisfy the relationship Vd>Vp (>0), where Vd is the circumferential speed in the Q1 direction on the circumferential surface 15 (outermost rotation locus circle) of the cutting edge 10a of the die 10 as the positive direction, and Vp is the circumferential speed in the Q2 direction on the circumferential surface 25 (outermost rotation locus circle) of the cutting edge 20a of the punch 20 as the positive direction. As a result, the circumferential speed Vd of the circumferential surface 15 of the cutting edge 10a of the die 10, which rotates in the Q1 direction to mesh, becomes larger than the circumferential speed Vp of the circumferential surface 25 of the cutting edge 20a of the punch 20, which rotates in the Q2 direction to mesh, and the cutting edge 10a of the die 10 can be rotated and moved faster than the cutting edge 20a of the punch 20.

[0053] As a result, when the relationship Rd-Rp>0 mm is satisfied, while the cutting edge 10a of the die 10 and the cutting edge 20a of the punch 20 rotate synchronously from the meshing start point P1 to the meshing end point P2, the cutting edge 10a of the die 10 can be rotated and moved faster by Vd-Vp than the cutting edge 20a of the punch 20. Then, it becomes possible to press the cutting edge 10a of the die 10 against the cutting edge 20a of the punch 20 without forming a gap C2 at the meshing end point P2.

[0054] At the meshing start point P1, as described above, the cutting edges 10a, 20a of the die 10 and the punch 20 are pressed against each other, so that no gap C1 is defined. For example, when Vd=Vp, even if meshing progresses from a meshing state where no gap C1 is defined, the relative positional relationship between the cutting edge 10a of the die 10 and the cutting edge 20a of the punch 20 in the meshing state does not change, and a gap C2 is defined at the meshing end point P2 (X2 side). In contrast, in the punch unit 1 satisfying the relationship Vd>Vp (>0), as the meshing progresses from the meshing state where the gap C1 is not defined at the meshing start point P1, the cutting edge 10a (edge ​​10b of the hole) of the die 10 rotates and moves faster than the cutting edge 20a of the punch 20, and the cutting edge 10a (edge ​​10b of the hole) of the die 10 separates from the cutting edge 20a (side surface 10c of the convex portion) of the punch 20, and the pressed state is released. After this, the cutting edge 10a of the die 10 satisfying the relationship Vd>Vp meshes with the cutting edge 20a of the punch 20 while filling the distance corresponding to the diameter difference (Dd-Dp) with the cutting edge 20a of the punch 20 due to the peripheral speed difference (Vd-Vp) with the cutting edge 20a of the punch 20, and eventually reaches the meshing end point P2 shown in FIG. 7 and FIG. 8.

[0055] Here, for the meshing end point P2, the case of the rotary punch unit disclosed in Patent Document 1 will be described for reference. In the rotary punch unit disclosed in Patent Document 1, the diameter difference between the cutting edge (hole) of the die and the cutting edge of the punch is set to "0 mm to the outer diameter of the cutting edge of the punch x 0.005 mm (excluding 0 mm)", and the clearance between the cutting edge of the die and the cutting edge of the punch at the meshing start point is set to "0 mm to the outer diameter of the cutting edge of the punch x (-0.005 mm) (excluding 0 mm)". Therefore, as described above, at the meshing start point, the cutting edge of the die and the cutting edge of the punch overlap, the formation of a gap at the meshing start point is suppressed, and the cutting edge of the die and the cutting edge of the punch are pressed together. However, as shown in FIG. 9, at the meshing end point P2, the cutting edge 10a of the die 10 and the cutting edge 20a of the punch 20 do not overlap. This is because the cutting edges of the die and punch, which overlap at the start point of meshing, are configured to undergo the same rotational movement as they move from the start point of meshing to the end point of meshing.

[0056] Therefore, in the case of the rotary punch unit disclosed in Patent Document 1, there is no idea of ​​filling the gap defined at the meshing end point P2, and inevitably, a gap C2 of a maximum of "0.005 mm x Dp" corresponding to the diameter difference between the cutting edge 10a of the die 10 and the cutting edge 20a of the punch 20 is generated. Therefore, in the case of the rotary punch unit disclosed in Patent Document 1, at the meshing end point P2, as shown in FIG. 9, the cutting edge 10a of the die 10 and the cutting edge 20a of the punch 20 do not contact each other and are not pressed against each other. Therefore, due to the definition of the gap C2 shown in FIG. 9, the contact between the cutting edge 10a of the die 10 and the cutting edge 20a of the punch 20 is prevented, and the necessary and important pressed state between the cutting edge 10a of the die 10 and the cutting edge 20a of the punch 20 is not generated, and it is considered that defects such as breakage are likely to occur due to the unstable meshing state with large variations at the meshing end point P2.

[0057] As described above, the punch unit 1 according to the present invention is configured so that the cutting edge 10a of the die 10 and the cutting edge 20a of the punch 20 satisfy the relationship 0 mm≦Dd-Dp≦0.005 mm. In this configuration, the distance by which the cutting edge 10a of the die 10 in the meshed state can lead the cutting edge 20a of the punch 20 due to the circumferential speed difference (Vd-Vp) with the cutting edge 20a of the punch 20 corresponds to the diameter difference (Dd-Dp) with the cutting edge 20a of the punch 20. Therefore, the circumferential speed difference (Vd-Vp) may be configured so that the cutting edge 10a of the die 10 leads by a maximum of 0.005 mm from the meshing start point P1 to the meshing end point P2. From this perspective, in order to appropriately configure the positional relationship at the engagement end point P2 between the cutting edge 10a of the die 10 and the cutting edge 20a of the punch 20, the punch unit 1 is configured so that the cutting edge 10a of the die 10 and the cutting edge 20a of the punch 20 satisfy the relationship Rd-Rp>0 mm, and preferably so that they satisfy the relationship 0.02 mm≦Rd-Rp≦0.40 mm.

[0058] When the cutting edge 10a of the die 10 and the cutting edge 20a of the punch 20 satisfy the relationship 0.02mm≦Rd-Rp≦0.40mm, the cutting edge 10a of the die 10 is sure to lead by a maximum of 0.005mm even when affected by resistance caused by the material, thickness, and hardness (flexibility) of the flat material S and resistance caused by meshing, and a stable pressure contact state between the cutting edge 10a of the die 10 and the cutting edge 20a of the punch 20 can be reliably formed at the meshing end point P2. Note that when Rd-Rp>0.40mm, the pressure contact between the cutting edge 10a of the die 10 and the cutting edge 20a of the punch 20 becomes stronger at the meshing end point P2, but if the pressure contact becomes too strong, the possibility of galling increases.

[0059] Between the starting point of engagement P1 (on the X1 side) shown in Fig. 5 and the ending point of engagement P2 (on the X2 side) shown in Fig. 7, the cutting edge 10a of the die 10 and the cutting edge 20a of the punch 20 are such that the cutting edge 10a of the die 10 (the circumferential surface 15 with the edge 10b of the hole) supports the flat material S from the Z2 side. At the same time, the cutting edge 20a of the punch 20 (the edge 20b of the circumferential surface 25 of the convex portion) presses the flat material S from the Z1 side, and cuts into the flat material S while advancing the engagement with the cutting edge 10a (the edge 10b of the hole) of the die 10. At this time, since the cutting edge 10a of the die 10 and the cutting edge 20a of the punch 20 have an appropriate overlap (Lz), the cutting edge 20a of the punch 20 (the edge 20b of the circumferential surface 25 of the convex portion) that cuts into the flat material S enters into the cutting edge 20a (the hole with the edge 10b of the circumferential surface 15) of the die 10 while passing from the state shown in Fig. 6 through the state shown in Fig. 4 to the state shown in Fig. 8. And at the ending point of engagement P2, the engagement state as shown in Fig. 8 is achieved. This is because, as described above, the cutting edge 10a of the die 10 and the cutting edge 20a of the punch 20 satisfy the relationship of Rd - Rp > 0 mm, resulting in Vd > Vp, so that the cutting edge 10a of the die 10 and the cutting edge 20a of the punch 20 are configured to be in a press-contact state without defining a gap C2 at the ending point of engagement P2. Note that since the punch unit 1 satisfies the relationship of Rd - Rp > 0 mm and has an overlap (Lz), it satisfies the relationship of Ldp < Rd + Rp.

[0060] At the meshing end point P2, the cutting edge 20a (edge ​​20b of the circumferential surface 25 of the convex portion) of the punch 20 that has penetrated the flat material S enters the cutting edge 20a of the die 10 (hole where the edge 10b of the circumferential surface 15 is located) as shown in Fig. 8. At this time, the cutting edge 10a of the die 10 and the cutting edge 20a of the punch 20 satisfy the relationship 0 mm ≦ Dd - Dp ≦ 0.005 mm, and are configured to be in pressure contact at the meshing start point P1, so that the cutting edge 20a of the punch 20 comes into contact with the cutting edge 10a of the die 10 (edge ​​10b of the hole in the circumferential surface 15) and are further in pressure contact with each other. This allows the positional relationship between the cutting edge 10a of the die 10 and the cutting edge 20a of the punch 20 at the meshing end point P2 to be appropriately configured, and the cutting edge 10a of the die 10 and the cutting edge 20a of the punch 20 are in a pressed contact state at the meshing end point P2, thereby reliably suppressing the formation of the gap C2.

[0061] When the cutting edge 10a of the die 10 and the cutting edge 20a of the punch 20 have a moderate overlap (Lz), even at the meshing end point P2, the portion of the cutting edge 20a of the punch 20 that comes into contact and presses against the cutting edge 10a of the die 10 (the edge 10b of the hole in the circumferential surface 15) is the side surface 20c of the circumferential surface 25 of the convex portion rather than the edge 20b of the circumferential surface 25 of the convex portion. In this way, by bringing the cutting edge 10a of the die 10 and the cutting edge 20a of the punch 20 into a pressed state at the meshing end point P2, the formation of the gap C2 can be reliably suppressed.

[0062] As described above, the punch unit 1 is preferably configured such that, when the cutting edge 10a of the die 10 and the cutting edge 20a of the punch 20 are in pressure contact at the meshing start point P1, the angle α between the line segment connecting the meshing start point P1 of the cutting edge 10a of the die 10 to the rotation center (axis center Od) of the die 10 and the line segment connecting the rotation center (axis center Od) of the die 10 to the rotation center (axis center Op) of the punch 20 satisfies the relationship of 0 degrees < α ≦ 15 degrees, as shown in Fig. 5. In this case, the meshing start point P1 of the cutting edge 10a of the die 10 corresponds to the edge 10b on the Y1 side of the circumferential surface 15 that becomes the cutting edge 10a of the die 10, as shown in Fig. 5.

[0063] This angle α is approximately the same as the angle that the cutting edge 10a (edge ​​10b) of the die 10 and the cutting edge 20a (edge ​​20b) of the punch 20, which enter the meshing start point P1, make with respect to the surface (XY plane) of the flat material S. For convenience, this angle α is referred to as the meshing angle. Note that the rotary punch unit at least satisfies the relationship 0 degrees≦α<90 degrees when the cutting edge 10a of the die 10 and the cutting edge 20a of the punch 20, which involve overlap (Lz), mesh at the meshing start point P1.

[0064] When the relationship of α=0 degrees is satisfied, at the meshing start point P1, the inner peripheral surface of the cutting edge 10a (hole) of the die 10 and the side surface 20c of the cutting edge 20a (convex portion) of the punch 20 are in contact and pressed against each other by design. In this positional relationship, the cutting edge 10a of the die 10 and the cutting edge 20a of the punch 20 are in a surface-pressed state by design. On the other hand, in the positional relationship shown in FIG. 6 in which the sharp edge 10b of the cutting edge 10a of the die 10 and the side surface 20c of the cutting edge 20a of the punch 20 are in contact and pressed against each other by the sharp corner (edge ​​10b) and the surface. From this point of view, the configuration shown in FIG. 6 (α>0 degrees) in which the sharp corner and the surface are pressed against each other can obtain a more stable pressed state than the configuration of α=0 degrees in which the surface is pressed against each other.

[0065] When the relationship of α>15 degrees is satisfied, the angle (approximately the same angle as α) made by the cutting edge 10a (edge ​​10b) of the die 10 and the cutting edge 20a (edge ​​20b) of the punch 20 entering the meshing start point P1 with respect to the flat material S becomes larger, and the angle (approximately the same angle as 90 degrees-α) made by the cutting edge 20a (side surface 20c) of the punch 20 with respect to the Z direction becomes larger. Therefore, the cutting angle (meshing angle) of the cutting edge 20a (edge ​​20b) of the punch 20 approaching from the Z2 side and cutting into the Z2 side surface (XY plane) of the flat material S becomes larger. The larger the cutting angle of the cutting edge 20a of the punch 20 with respect to the flat material S, the greater the proportion of the side surface 20c of the cutting edge 20a of the punch 20 that contacts the surface of the flat material S, and therefore the greater the repulsion from the flat material S during cutting.

[0066] From the above viewpoint, when the cutting edge 10a of the die 10 and the cutting edge 20a of the punch 20 are in pressure contact at the meshing start point P1, the relationship 0 degrees<α≦15 degrees is preferably satisfied.

[0067] As described above, the punch unit 1 is preferably configured such that the angle β (unit: radian) that the meshing start point P1 of the cutting edge 10a of the die 10 and the meshing end point P2 of the cutting edge 10a of the die 10 make with respect to the axis Od of the first shaft 11 that is the center of rotation of the die 10 satisfies the relationship 0.02 mm≦(Rd-Rp)·β≦0.10 mm. In this case, the meshing start point P1 of the cutting edge 10a of the die 10 corresponds to the edge 10b on the Y1 side of the circumferential surface 15 that becomes the cutting edge 10a of the die 10, as shown in FIG. 4. Also, the meshing end point P2 of the cutting edge 10a of the die 10 corresponds to the edge 20b on the Y2 side of the circumferential surface 15 that becomes the cutting edge 10a of the die 10, as shown in FIG. 4.

[0068] In the relationship 0.02mm≦(Rd-Rp)·β≦0.10mm, the term (Rd-Rp)·β can be expressed as Rd·β-Rp·β. The term Rd·β represents the length of the locus (arc) along which the edge 10b of the hole in the circumferential surface 15 of the cutting edge 10a of the die 10, which rotates in the Q1 direction, rotates from the meshing start point P1 to the meshing end point P2. The term Rp·β represents the length of the locus (arc) along which the edge 20b of the circumferential surface 25 of the convex portion of the cutting edge 20a of the punch 20, which rotates in the Q2 direction, rotates from the meshing start point P1 to the meshing end point P2. Therefore, the term (Rd-Rp) β represents the difference in rotational movement distance when the cutting edge 10a (edge ​​10b) of the die 10 and the cutting edge 20a (edge ​​20b) of the punch 20, which rotate synchronously, rotate from the meshing start point P1 to the meshing end point P2. The cutting edge 10a of the die 10 advances further than the cutting edge 20a of the punch 20 by the difference in rotational movement distance, thereby filling the difference (Dd-Dp) between the inner diameter Dd of the cutting edge 10a (hole) of the die 10 and the outer diameter Dp of the cutting edge 20a (convex portion) of the punch 20.

[0069] As described above, the cutting edge 10a of the die 10 and the cutting edge 20a of the punch 20 are configured to satisfy the relationship of 0 mm≦Dd-Dp≦0.005 mm and to be pressed against each other at the meshing start point P1. Therefore, the term (Rd-Rp)·β is set so that at least the diameter difference (Dd-Dp) between the cutting edge 10a of the die 10 and the cutting edge 20a of the punch 20 is eliminated. In addition, no difference in rotational movement distance is required (0 mm) to eliminate the pressed state at the meshing start point P1, but it is set in consideration of the possibility of overlapping with microscopic elastic deformation, the dimensional accuracy of each part, and the assembly accuracy. Therefore, the term (Rd-Rp)·β is set so that at least the relationship of (Rd-Rp)·β>0.005 mm is satisfied so that the pressed state is formed without the gap C2 being defined at the meshing end point P2. Preferably, the relationship is set to satisfy (Rd-Rp)·β≧0.01 mm so that a reliably pressed state is formed at the meshing end point P2. More preferably, the relationship is set to satisfy (Rd-Rp)·β≧0.02 mm so that a reliably pressed state is formed at the meshing end point P2 and sufficient pressing force is obtained. It is preferable to satisfy the relationship (Rd-Rp)·β≦0.10 mm, and if (Rd-Rp)·β>0.10 mm, there is a possibility that an excessively pressed state will be formed at the meshing end point P2, raising concerns about the occurrence of galling.

[0070] Next, an embodiment of a rotary punch unit according to the present invention will be described. Specifically, the present invention will be described with reference to an example in which the present invention is applied to the rotary punch 1 shown in the above-mentioned Figs. 1 to 8, with appropriate reference to the drawings. In addition, in describing the configuration example of the rotary punch unit according to the present invention, the above-mentioned Figs. 1 to 8 will be used and Figs. 10 to 12 will be referred to. Furthermore, the names, symbols and signs of the parts shown in Figs. 10 to 12 are the same as those of the rotary punch 1 shown in Figs. 1 to 8, unless otherwise specified. Furthermore, the rotary punch unit according to the present invention will be referred to as a "partial punch 1" when distinguishing it from the rotary punch 1 shown in Figs. 1 to 8.

[0071] The rotary punch unit (partial punch 1) according to the present invention can be configured, for example, by using the punch unit 1 shown in Figs. 1 to 8. The punch unit 1 allows for highly accurate setting and adjustment of the machining, assembly, and rotation control of the die 10 and punch 20, and is configured to satisfy the relationship of 0 mm ≦ Dd - Dp ≦ 0.005 mm as described above, and to have the cutting edge 10a of the die 10 and the cutting edge 20a of the punch 20 press against each other at the meshing start point P1, and to satisfy the relationship of Rd - Rp > 0 mm, and to have the cutting edge 10a of the die 10 and the cutting edge 20a of the punch 20 press against each other at the meshing end point P2. Therefore, the punch unit 1 allows for easy and highly accurate setting and adjustment of the clearance and pressure state of the meshing portion during the punching operation. Therefore, by utilizing the configuration of the punch unit 1, it is possible to obtain a preferable partial punch 1 in which the positional relationship between the cutting edge 10a of the die 10 and the cutting edge 20a of the punch 20, which constitute the meshing portion while moving from the meshing start point P1 to the meshing end point P2, can be easily and accurately set and adjusted. Note that the partial punch 1 is not limited to utilizing the configuration of the punch unit 1 that satisfies the relationship Rd-Rp>0 mm. The partial punch 1 can also utilize the configuration of a rotary punch unit that satisfies the relationship Rd-Rp=0 mm.

[0072] The partial punch 1 according to the present invention has the same configuration as the punch unit 1 shown in FIGS. 1 to 8, except that either the cutting edge 10a of the die 10 or the cutting edge 20a of the punch 20 has one to three recesses (see FIGS. 10 and 11). Specifically, the partial punch 1 has the cutting edge 10a of the die 10 (see FIG. 4) provided on the first shaft 11 rotating in one direction indicated by an arrow Q1 in FIG. 2, and the cutting edge 20a of the punch 20 (see FIG. 4) provided on the second shaft 21 which is parallel to the axial direction (Y direction) of the first shaft 11 and rotates synchronously in the opposite direction to the first shaft 11 indicated by an arrow Q2 in FIG. 2. In the partial punch 1, the cutting edge 10a of the die 10 and the cutting edge 20a of the punch 20 form an engagement portion and an engagement point P, similar to the punch unit 1 shown in FIGS. 1 to 8. In the partial punch 1, the meshing portion cuts into the flat material S supplied between the die 10 and the punch 20 while moving from the punching start point to the punching end point, thereby forming a circular hole in the flat material S. At this time, in the partial punch 1, the meshing point P moves from the meshing start point P1 to the meshing end point P2 on the flat material S, and forms a semicircular first cutting line SA on one side and a semicircular second cutting line SB on the other side as shown in FIG. 12, cuts out a chip Sw, and forms a circular hole (reference symbol Sw is used) in the flat material S.

[0073] In the partial punch 1, as shown in FIG. 12, one semicircular first cutting line SA is formed by a meshing point PA that moves in the direction indicated by the arrow ZA from the meshing start point P1 to the meshing end point P2 in the flat material S. In addition, in the partial punch 1, the other semicircular second cutting line SB is formed by a meshing point PB that moves in the direction indicated by the arrow ZB from the meshing start point P1 to the meshing end point P2. As a result, the flat material S is cut from the meshing start point P1 to the meshing end point P2, cutting chips Sw are cut out from the flat material S, and circular holes corresponding to the cutting chips Sw are formed in the flat material S. The meshing points PA and PB are a pair of points that move simultaneously on a trajectory that is line-symmetrical with respect to the line segment connecting the meshing start point P1 and the meshing end point P2. The first cutting line SA and the second cutting line SB are a pair of semicircular cutting lines that are line-symmetrical with respect to a line segment connecting the meshing start point P1 and the meshing end point P2.

[0074] As shown in Fig. 10, the partial punch 1 has one to three recesses 101, 102, 103 on the cutting edge 10a (edge ​​10b of the corner) of the die 10, and can cut out chips Sw while forming one to three uncut portions S1, S2, S3 that are connected to the flat material S at positions corresponding to the one to three recesses 101, 102, 103. Alternatively, as shown in Fig. 11, the partial punch 1 has one to three recesses 201, 202, 203 on the cutting edge 20a (edge ​​20b of the corner) of the punch 20, and can cut out chips Sw while forming one to three uncut portions S1, S2, S3 that are connected to the flat material S at positions corresponding to the one to three recesses 201, 202, 203. After the flat material S has been transported, the chips Sw that remain connected to the flat material S in one to three places can be left connected to the flat material S or separated from the flat material S and removed, which can be selected appropriately depending on practical circumstances.

[0075] In the partial punch 1, the recess can be provided on the die 10 side as shown in FIG. 10, or on the punch 20 side as shown in FIG. 11. In the partial punch 1, the recess is preferably provided on the die 10 side. At the meshing start point P1, the cutting edge 20a of the punch 20 cuts into the flat material S supported by the cutting edge 10a of the die 10 from the Z1 side, and immediately after cutting through the thickness of the flat material S, it comes into contact with the cutting edge 10a of the die 10 and forms a meshing portion with a suitable meshing angle (shear angle). Then, the cutting edge 20a of the punch 20 continues to cut into the thickness of the flat material S from the Z1 side while maintaining a suitable meshing angle (shear angle) with the cutting edge 10a of the die 10 from the meshing start point P1 to the meshing end point P2. Therefore, when the punch 20 side has a recess, there is a risk that the edges of the corners of the recess that move while cutting into the thickness of the flat material S will scratch and damage the flat material S or that the edges will get caught on the flat material S and stop the perforation, which may be disadvantageous depending on the conditions of use. In contrast, the cutting edge 10a of the die 10 continues to support the flat material S from the Z2 side from the meshing start point P1 to the meshing end point P2. Therefore, when the die 10 side has a recess, the cutting edge 10a (corner edge 10b) of the die 10 is less likely to cut into the thickness of the flat material S like the cutting edge 20a of the punch 20, and the risk that the edges of the corners of the recess will scratch the flat material S or get caught on the flat material S is significantly reduced, which is preferable.

[0076] The recesses as viewed from the Z1 side shown in FIG. 10 and the recesses as viewed from the Z2 side shown in FIG. 11 have an approximately rectangular shape, but the shape is not limited to an approximately rectangular shape. The recesses may have a polygonal shape such as an approximately semicircular shape, an approximately elliptical shape, an approximately triangular shape, or an approximately pentagonal shape. The recesses are preferably approximately rectangular or approximately semicircular shapes that can easily secure a larger recess space. The depth of the recesses (amount of recess) is preferably set to be greater than the thickness of the flat material S. The depth of the recesses means the length of the recesses from the inner peripheral surface of the cutting blade 10a (hole) toward the radially outward direction when the recesses are provided on the die 10 side, and means the length of the recesses from the outer peripheral surface of the cutting blade 20a (protruding portion) toward the radially inward direction when the recesses are provided on the punch 20 side. The length of the recesses is preferably set to be greater than the thickness of the flat material S, similar to the depth of the recesses. The length of the recess means the length of the recess from the cutting edge 10a (corner edge 10b) toward the Z2 side when the recess is provided on the die 10 side, and means the length of the recess from the cutting edge 20a (corner edge 20b) toward the Z1 side when the recess is provided on the punch 20 side. The width of the recess may be appropriately set according to the size (width) of the desired uncut portion.

[0077] At the meshing point P, the flat material S is pressed by the cutting blade 20a of the punch 20 and pressed against the cutting blade 10a of the die 10, and is cut while being sandwiched between the cutting blades 10a, 20a. At this time, due to minute fluctuations in the meshing portion, the flat material S is not sharply cut, but is crushed and torn, and there is a risk that the uncut portion will be torn off. In such a case, by setting the depth (depression amount) of the recess and the length of the recess to be larger than the thickness of the flat material S, it is possible to secure a sufficient space for the flat material S to fit into the recess. As a result, even if the flat material S is crushed, the flat material S pressed by one cutting blade that does not have a recess fits into the recess of the other cutting blade, and the fitted portion can be left as the uncut portion.

[0078] As described above, in the case of the partial punch 1, the cutting edge 10a of the die 10 or the cutting edge 20a of the punch 20 has a recess, so that the cut chips Sw are connected to the flat material S at the position of the circular hole by one to three remaining uncut portions S1, S2, and S3. Therefore, the chips Sw do not easily fall off from the position of the circular hole of the flat material S, and are carried out from the rotary punch unit and the auxiliary device together with the flat material S. In contrast, in the case of the punch unit 1 shown in FIG. 1 to FIG. 8, the cutting edge 10a of the die 10 or the cutting edge 20a of the punch 20 does not have a recess, so that the chips Sw cut out from the flat material S are not connected to the flat material S at the position of the circular hole. Therefore, there is a risk that the chips Sw will easily break away from the position of the circular hole of the flat material S and will fall off normally, will adhere to the surface of the flat material S, or will enter the rotary punch unit or the auxiliary device. From this perspective, it is believed that the partial punch 1 of the present invention has a reasonable degree of practicality and can prevent cutting chips Sw (punch pieces) from adhering to the flat material S (material to be punched) and from entering the rotary punch unit or ancillary equipment.

[0079] <One point left punch> Partial Punch 1 is (1-1) A location corresponding to the engagement end point P2 of either the cutting edge 10a of the die 10 or the cutting edge 20a of the punch 20; (1-2) A point corresponding to any one point (meshing point PA) on the first cutting line SA within a range from an engagement start point P1 of either the cutting edge 10a of the die 10 or the cutting edge 20a of the punch 20 toward an engagement end point P2, the angle θA around one side of the center point Hc of the circular hole (chip Sw) as indicated by the arrow ZA being preferably 30 degrees or more and 100 degrees or less, more preferably 30 degrees or more and 90 degrees or less; (1-3) A point corresponding to any one point (meshing point PB) on the second cutting line SB within a range from the meshing start point P1 of either the cutting edge 10a of the die 10 or the cutting edge 20a of the punch 20 toward the meshing end point P2, the angle θB around the other as indicated by the arrow ZB at the center Hc point of the circular hole (chip Sw) is preferably 30 degrees or more and 100 degrees or less, more preferably 30 degrees or more and 90 degrees or less; The partial punch 1 that cuts out the chip Sw that is connected to the flat material S at one point can be configured to cut out at a position corresponding to the recess provided at any one of the positions. For simplicity, the partial punch 1 that cuts out the chip Sw that is connected to the flat material S at one point is referred to as a one-point remaining punch 1. Note that the center point Hc of the circular hole (chip Sw) of the flat material S shown in FIG. 12 corresponds to the radial center point Dc of the die 10 shown in FIG. 10 and the radial center point Pc of the punch 20 shown in FIG. 11, and overlaps with the center point Dc and the center point Pc in the Z direction. In addition, it will be described later that it is preferable to provide the recess within a range in which the angles θA and θB are preferably 30 degrees or more and 100 degrees or less, more preferably 30 degrees or more and 90 degrees or less.

[0080] The one-point-leaving punch 1 having the above configuration (1-1) can cut out chips Sw connected to the flat material S at one uncut portion S1 shown in FIG. 12 at a position corresponding to one recess 101 shown in FIG. 10 or at a position corresponding to one recess 201 shown in FIG. 11. The one-point-leaving punch 1 having the above configuration (1-2) can cut out chips Sw connected to the flat material S at one uncut portion S2 shown in FIG. 12 at a position corresponding to one recess 102 shown in FIG. 10 or at a position corresponding to one recess 202 shown in FIG. 11. The one-point-leaving punch 1 having the above configuration (1-3) can cut out chips Sw connected to the flat material S at one uncut portion S3 shown in FIG. 12 at a position corresponding to one recess 103 shown in FIG. 10 or at a position corresponding to one recess 203 shown in FIG. 11.

[0081] The chips Sw cut out by the one-point-leaving punch 1 described above are connected to the flat material S at one of the three remaining cut portions S1, S2, and S3 shown in Fig. 12. By connecting the chips Sw to the flat material S at one point and retaining them at the position of the circular hole, it is possible to prevent the chips Sw from falling off from the flat material S. As a result, the chips Sw are carried out together with the flat material S, and it is possible to prevent the chips Sw from falling off and entering the rotary punch unit or ancillary devices.

[0082] The one-point-leaving punch 1 is preferably configured as described above in (1-1), with the recess provided at a position corresponding to the meshing end point P2. This allows the cutting edges to smoothly contact each other from the meshing start point P1 to just before the meshing end point P2, making it difficult for meshing abnormalities to occur, and allows smooth cutting simultaneously to both ends of the left-cut portion S1 that connects to the flat material S at the meshing end point P2. As a result, the portion of the left-cut portion S1 that connects to the flat material S is more likely to be prevented from tearing, and the effect of preventing the chips Sw from falling off is improved.

[0083] <2-point punch> Partial Punch 1 is (2-1) A combination of a location corresponding to an engagement end point P2 of either the cutting edge 10a of the die 10 or the cutting edge 20a of the punch 20, and a location corresponding to any one point (engagement point PA) on the first cutting line SA, in which the angle θA around the center point Hc of the circular hole (chip Sw) as indicated by the arrow ZA from the engagement start point P1 to the engagement end point P2 of either the cutting edge 10a of the die 10 or the cutting edge 20a of the punch 20 is preferably within a range of 30 degrees or more and 100 degrees or less, more preferably 30 degrees or more and 90 degrees or less, (2-2) A combination of a location corresponding to an engagement end point P2 of either the cutting edge 10a of the die 10 or the cutting edge 20a of the punch 20, and a location corresponding to any one point (engagement point PB) on the second cutting line SB, in which the angle θB around the other side indicated by the arrow ZB of the center point Hc of the circular hole (chip Sw) from the engagement start point P1 toward the engagement end point P2 of either the cutting edge 10a of the die 10 or the cutting edge 20a of the punch 20 is preferably within a range of 30 degrees or more and 100 degrees or less, more preferably 30 degrees or more and 90 degrees or less, (2-3) A combination of a location corresponding to any one point (meshing point PA) on the first cutting line SA within a range of preferably 30 degrees or more and 100 degrees or less, more preferably 30 degrees or more and 90 degrees or less, around one side indicated by an arrow ZA of the center point Hc of the circular hole (chip Sw) from the meshing start point P1 to the meshing end point P2 of either the cutting edge 10a of the die 10 or the cutting edge 20a of the punch 20, and a location corresponding to any one point (meshing point PB) on the second cutting line SB within a range of 30 degrees or more and 100 degrees or less, around the other side indicated by an arrow ZB of the center point Hc of the circular hole (chip Sw) from the meshing start point P1 to the meshing end point P2 of either the cutting edge 10a of the die 10 or the cutting edge 20a of the punch 20, It is possible to configure the punch 1 so that it cuts out chips Sw that are connected at two points on the flat material S at positions corresponding to the recesses provided at two points by any one of the combinations above. For simplicity, the partial punch 1 configured to cut out chips Sw that are connected at two points on the flat material S is referred to as a two-point-remaining punch 1. The relationship between the center point Hc, the center point Dc, and the center point Pc is the same as in the case of the one-point-remaining punch 1. It will be described later that it is preferable to configure the recesses so that the angles θA and θB are preferably in the range of 30 degrees or more and 100 degrees or less, more preferably 30 degrees or more and 90 degrees or less.

[0084] The two-point-leaving punch 1 having the configuration of (2-1) above can cut out a chip Sw that is connected at two places, the uncut portions S1 and S2 shown in Fig. 12, from the flat material S at positions corresponding to the two recesses 101 and 102 shown in Fig. 10, or at positions corresponding to the two recesses 201 and 202 shown in Fig. 11. The two-point-leaving punch 1 having the configuration of (2-2) above can cut out a chip Sw that is connected at two places, the uncut portions S1 and S2 shown in Fig. 12, from the flat material S at positions corresponding to the two recesses 101 and 103 shown in Fig. 10, or at positions corresponding to the two recesses 201 and 203 shown in Fig. 11. In addition, the two-point leaving punch 1 having the configuration (2-3) above can cut out a chip Sw that is connected at two uncut portions S2 and S3 shown in Figure 12 from the flat material S at positions corresponding to the two recesses 102 and 103 shown in Figure 10, or at positions corresponding to the two recesses 202 and 203 shown in Figure 11.

[0085] The chips Sw cut out by the two-point-remaining punch 1 described above are connected to the flat material S at any two of the three remaining cut portions S1, S2, and S3 shown in Fig. 12. By connecting the chips Sw to the flat material S at two points and retaining them at the position of the circular hole, it is possible to enhance the effect of preventing the chips Sw from falling off the flat material S, compared to when the chips Sw are connected at one point. As a result, the chips Sw are reliably conveyed out together with the flat material S, and it is possible to reliably prevent the chips Sw from falling off and entering the rotary punch unit or ancillary devices.

[0086] The two-point-leaving punch 1 is preferably configured as described above in (2-3), and two recesses are provided at a location corresponding to an arbitrary point (meshing point PA) on the first cutting line SA within a range where the angle θA is 30 degrees or more and 100 degrees or less, and at a location corresponding to an arbitrary point (meshing point PB) on the second cutting line SB within a range where the angle θB is preferably 30 degrees or more and 100 degrees or less, more preferably 30 degrees or more and 90 degrees or less. This allows the cutting blades moving simultaneously on linearly symmetrical tracks to pass through each other's recesses at the same time, and simultaneously interrupt the cutting at one end of the remaining cut portions S2 and S3 connected to the flat material S at the positions of the meshing points PA and PB, and simultaneously resume the cutting from the other end of the remaining cut portions S2 and S3. As a result, the balance of the meshing between the meshing points PA and PB is suppressed during the meshing, and the occurrence of defects such as the remaining cut portions S2 and S3 being torn off can be suppressed.

[0087] <Three-point punch> Partial Punch 1 is (3-1) A location corresponding to an engagement end point P2 of either the cutting edge 10a of the die 10 or the cutting edge 20a of the punch 20, and a location corresponding to any one point (engagement point PA) on the first cutting line SA, in which an angle θA around one side of the center point Hc of the circular hole (chip Sw) indicated by an arrow ZA from an engagement start point P1 to an engagement end point P2 of either the cutting edge 10a of the die 10 or the cutting edge 20a of the punch 20 is preferably within a range of 30 degrees or more and 100 degrees or less, more preferably 30 degrees or more and 90 degrees or less, and The punch 10a of the punch 10 or the punch 20a of the punch 20 is configured to cut out the chips Sw connected at three points to the flat material S at a position corresponding to the recesses provided at three points by combining with a point corresponding to any one point (meshing point PB) on the second cutting line SB, in which the angle θB is preferably within a range of 30 degrees or more and 100 degrees or less, more preferably 30 degrees or more and 90 degrees or less, from the meshing start point P1 of either the cutting edge 10a of the punch 10 or the cutting edge 20a of the punch 20 toward the meshing end point P2 of the other of the center point Hc of the circular hole (chip Sw). For simplicity, the partial punch 1 configured to cut out the chips Sw connected at three points to the flat material S is called the three-point-remaining punch 1. The relationship between the center point Hc, the center point Dc, and the center point Pc is the same as that of the one-point-remaining punch 1. The fact that the recesses are preferably provided within a range of the angles θA and θB of 30 degrees or more and 100 degrees or less, more preferably 30 degrees or more and 90 degrees or less, will be described later.

[0088] The three-point-leaving punch 1 having the above-mentioned configuration (3-1) can cut out the chips Sw connected to the flat material S at three places, the remaining portions S1, S2, and S3 shown in FIG. 12, at positions corresponding to the three recesses 101, 102, and 103 shown in FIG. 10, or at positions corresponding to the three recesses 201, 202, and 203 shown in FIG. 11. The chips Sw cut out by the three-point-leaving punch 1 described above are connected to the flat material S at three places, the remaining portions S1, S2, and S3. By connecting the chips Sw to the flat material S at three places and retaining them at the position of the circular hole, the effect of preventing the chips Sw from falling off the flat material S can be sufficiently improved compared to the case where the chips Sw are connected at two places. As a result, the chips Sw are safely and reliably conveyed out together with the flat material S, and the chips Sw can be safely and reliably prevented from falling off and entering the rotary punch unit or ancillary devices.

[0089] The partial punch 1 is preferably configured as described above in (3-1), and has three recesses at a location corresponding to the meshing end point P2, a location corresponding to an arbitrary point (mesh point PA) on the first cutting line SA where the angle θA is preferably in the range of 30 degrees to 100 degrees, more preferably 30 degrees to 90 degrees, and a location corresponding to an arbitrary point (mesh point PB) on the second cutting line SB where the angle θB is preferably in the range of 30 degrees to 100 degrees, more preferably 30 degrees to 90 degrees. This allows the cutting blades moving simultaneously on linearly symmetrical tracks to pass through each other's recesses at the same time, and simultaneously interrupt the cutting at one end of the remaining cut portions S2 and S3 connected to the flat material S at the positions of the meshing points PA and PB, and simultaneously resume the cutting from the other end of the remaining cut portions S2 and S3. Then, the cutting can be smoothly performed simultaneously up to both ends of the remaining cut portions S1 connected to the flat material S at the position of the meshing end point P2. As a result, the balance of meshing between meshing points PA and PB is prevented from being lost during meshing, and the portion of the remaining cut portion S1 connected to the flat material S is more easily prevented from tearing off, thereby preventing the occurrence of problems such as the remaining cut portions S1, S2, and S3 being torn off.

[0090] <Range of angles θA and θB> In the partial punch 1, the recesses provided on the die 10 side or the punch 20 side are preferably provided within a range in which the angles θA and θB are 30 degrees or more and 100 degrees or less, more preferably within a range in which the angles are 30 degrees or more and 90 degrees or less. The appropriate ranges of the angles θA and θB for providing the recesses are set based on the results of a simulation performed by geometrically modeling the rotary punch unit. The effectiveness of the configuration in which the angles θA and θB are provided within a range in which the angles θA and θB are 30 degrees or more and 100 degrees or less, more preferably within a range in which the angles are 30 degrees or more and 90 degrees or less, will be described below with reference to the contents of the simulation.

[0091] In the simulation, the modeling preconditions were set to perform a geometric modeling of the rotary punch unit. The modeling preconditions are the following 1 to 5. [1] The cutting edge 20a of the punch 20 with diameter (outer diameter) Dp rotates and moves on the XZ plane (see Figure 4) with rotation radius Rp (rotation angle ωp, length of the trajectory arc Rp · ωp, maximum rotation angle ωpN), and in sync with the punch 20, the cutting edge 10a of the die 10 with diameter (hole diameter) Dd rotates and moves on the XZ plane with rotation radius Rd (rotation angle ωp, length of the trajectory arc Rp · ωp), so that the intersection of the respective trajectory arcs moves on the XY plane to form the meshing point P. [2] The meshing point P starts from the meshing start point P1 (origin), moves on a trajectory arc on the XZ plane from a rotation angle ωp=0 to the maximum rotation angle ωpN, and on the XY plane it separates into meshing points PA and PB, which rotate in opposite directions (see Figures 11 and 12) (rotation angle θ, maximum rotation angle θpN), and then meets at the meshing end point P2, during which a circular hole (chip Sw) of the same diameter as the cutting edge 20a of the punch 20 is formed in the flat material S. [3] The position (coordinate) of meshing point P on the XY plane is represented by a vector (line segment P1-P) that points from meshing start point P1 to meshing point P. The X-component of the vector (X-coordinate) can be determined from the geometric relationship between the arc and the chord, and the Y-component (Y-coordinate) can be determined from Pythagoras' theorem for a right-angled triangle. [4] The clearance C is set by adding it to the diameter (hole diameter) Dd of the cutting edge 10a of the die 10, and is adjusted to zero (C=0) on the side of the starting point P1 of meshing to smooth the start of meshing. [5] The pressure contact state between the cutting edge 10a of the die 10 and the cutting edge 20a of the punch 20 is adjusted by adding a delay amount PRE in the X direction from the meshing start point P1 of the die 10 in accordance with the pressure contact distribution (P1.pre) on the meshing start point P1 side that is set in advance, using the Z-direction overlap amount Lz, which is determined by the axial distance Ldp between the rotation axis Od of the die 10 and the rotation axis Od of the punch 20 and the rotation radii Rd and Rp, as the pressure contact amount (no pressure contact is achieved when Lz = 0).

[0092] In the simulation, the above prerequisites 1 to 5 were taken into consideration, and the geometric model shown in FIG. 13 was constructed. In order to realize the geometric model shown in FIG. 13, the parameters and evaluation conditions 1 to 18 shown in Table 1 were set. Note that in the simulation, the symmetry of the angles θA and θB in the geometric model was taken into consideration, and the rotational movement of the meshing point P (PA) on the angle θA side (rotational angle θp , i = 0 to 180, maximum rotation angle θpN = 180 degrees) were evaluated.

[0093] [Table 1]

[0094] In the simulation, each item was calculated using each calculation formula in Table 2 for evaluation conditions 1 to 18 shown in Table 1, and the calculation results were examined and considered. Note that Rp, Rd, Ldp, Lz, Dp, Dd, and C shown in Table 1 are fixed values ​​determined at the design stage of the rotary punch unit. In addition, the difference between Rd and Rp, Rd-Rp (=Rdp), is also a fixed value. However, C is adjusted to C1 (=0) at the meshing start point P1 side during assembly in the Y direction (see precondition 4), and as a result, it is adjusted to C2 (=C) at the meshing end point P2 side. In addition, at the same time as C1, the pressure distribution P1.pre on the meshing start point P1 side shown in Table 1 is also adjusted during assembly (see precondition 5). Therefore, C1 and P1.pre, which are not determined at the design stage and are adjusted during assembly, can be considered as variable values ​​including artificial variations.

[0095] [Table 2]

[0096] As shown in Table 1, the tendency of change for evaluation conditions 1 to 18 corresponds to the die diameter Dd and the clearance C, and corresponds to the pressure distribution P1.PRE at the meshing start point P1 and the delay amount PRE in the X direction of the die. When the difference Rdp=Rd-Rp between the rotation radius Rd of the die cutting edge and the rotation radius Rp of the punch cutting edge shown in Table 1 is calculated, Rdp is 0 mm for evaluation conditions 1 to 9 and 0.15 mm for evaluation conditions 10 to 18.

[0097] Rotation angle θp on the XY plane obtained for evaluation conditions 1 to 18 Difference to Xdp and the differential Ydp The minimum, average and maximum values ​​of are shown in Table 3. The difference Xdp The graph of the difference Ydp for evaluation conditions 1 to 18 is shown in FIG. The graph is shown in Figure 15.

[0098] [Table 3]

[0099] [Diff Xdp ] As shown in Table 3 and FIG. 14, for each of evaluation conditions 1 to 9 (Rdp=0) and evaluation conditions 10 to 18 (Rdp=0.15), the difference Xdp It can be seen that the average value of shows a tendency to decrease stepwise. Also, although the numerical values ​​are different, the difference Xdp Similarly, the minimum and maximum values ​​of each of the difference Xdp also show a step-like change tendency similar to the average value. The average value of is constant at 0.000000 under evaluation conditions 1 to 3, constant at -0.007500 under evaluation conditions 4 to 6, constant at -0.015000 under evaluation conditions 7 to 9, constant at 0.022467 under evaluation conditions 10 to 12, constant at 0.014967 under evaluation conditions 13 to 15, and constant at 0.007467 under evaluation conditions 16 to 18. It can be seen from Table 1 that the step-like change in the difference Xdp corresponds to the change in the delay amount PRE of the die in the X direction, and does not correspond to the change in the clearance C. Looking at the average level (median) of Xdp, it is about -0.0075 for evaluation conditions 1 to 9, and about 0.0150 for evaluation conditions 10 to 18, so there is a difference of about 0.0225 between the two levels. Referring to Table 1, the difference in the average value level (median) is considered to correspond to the difference in the radius of gyration Rdp.

[0100] [Diff Ydp ] As shown in Table 3 and FIG. 15, for evaluation conditions 1 to 9 (Rdp=0), the difference Ydp It can be seen that the maximum value of Ydp increases gradually. It can be seen that the minimum value of Ydp tends to increase gradually. Referring to Table 1, it can be seen that the tendency of the maximum and minimum values ​​of the gradually increasing change corresponds to the change in the sum (PRE+C) of the delay amount PRE of the die in the X direction and the clearance C.

[0101] In addition, for evaluation conditions 1 to 9, the difference Ydp It can be seen that the minimum value of the difference Ydp for evaluation conditions 10 to 18 tends to decrease stepwise. It can be seen that the maximum value of Ydp tends to decrease stepwise. It can be seen that the minimum value of the difference Ydp tends to decrease stepwise from evaluation conditions 1 to 3 to evaluation conditions 4 to 6, and from evaluation conditions 4 to 6 to evaluation conditions 7 to 9. It can be seen that the maximum value of the difference Ydp tends to decrease stepwise from evaluation conditions 10-12 to evaluation conditions 13-15, and from evaluation conditions 13-15 to evaluation conditions 16-18. Referring to Table 1, it can be seen that the tendency of the maximum and minimum values ​​of PRE to decrease stepwise corresponds to an inverse proportion to the change in the delay amount PRE of the die in the X direction, and does not correspond to a change in the difference Rdp of the rotation radius.

[0102] In addition, for each of evaluation conditions 4 to 6 and evaluation conditions 7 to 9, the difference Ydp It can be seen that the minimum value of the difference Ydp increases gradually. The minimum value of the difference Ydp for each of the evaluation conditions 10 to 12, 13 to 15, and 16 to 18 increases. It can be seen that the maximum value of Ydp tends to increase gradually. By referring to Table 1, it can be seen that the tendency of the minimum and maximum values ​​of PRE to increase stepwise corresponds to an inverse proportion to a change in the delay amount PRE of the die in the X direction, corresponds to a proportion to a change in the clearance C, and does not correspond to a change in the difference Rdp of the radii of rotation.

[0103] Also, the difference Ydp Looking at the average level (median) of Ydp, it is about 0.0031 for evaluation conditions 1 to 9, and about -0.0143 for evaluation conditions 10 to 18, and there is a difference of about 0.0174 between the two levels. Referring to Table 1, the difference in the average value level (median) is considered to correspond to the difference in the radius of gyration Rdp.

[0104] From the above simulation and its results, the difference Xdp is affected by PRE and Rdp, and the difference Ydp It was found that is influenced by PRE, C, and Rdp. Note that C1 and P1.pre on the side of the meshing start point P1, which are adjusted during assembly, are variable values ​​that include artificial variation as described above, so C related to C1 and PRE related to P1.pre are parameters that include variation. In addition, since the rotation radii Rd and Rp determined at the design stage are fixed values ​​that do not include artificial variation, the difference Rdp between them is a constant value that does not include variation. In the partial punch 1, when determining the appropriate range of the angle θA (θB) for providing the recess on the die 10 side or the punch 20 side, it is considered desirable to base it on an index that is influenced by more parameters. From this perspective, as an index for evaluating the effectiveness of the range of the angle θA (θB) for providing the recess, in addition to the influence of PRE and Rdp, the difference Ydp that is influenced by C The difference is Xdp was deemed more appropriate.

[0105] Here, the meshing point P (PA, PB) on the die side is Pd, and the meshing point on the punch side is Pp. The positional relationship between the die side point Pd and the punch side point Pp and the difference Xdp shown in item 5 of Table 2 are and the difference Ydp shown in item 6 The relationship between these two will be explained.

[0106] In the X direction, the difference Xdp When the difference Xdp is a positive value, the punch side point Pp is closer to 0 (the origin) than the die side point Pd. Therefore, the punch side point Pp contacts the die side point Pd, generating a pressure contact force at the meshing point P. On the other hand, When the difference Xdp is negative, the point Pd on the die side is closer to 0 (the origin) than the point Pp on the punch side. Therefore, the point Pp on the punch side is separated from the point Pd on the die side, and a gap is generated at the meshing point P. When the difference Ydp is 0 (zero), the punch side point Pp may come into contact with the die side point Pd, generating a pressure force at the meshing point P, or the punch side point Pp may move away from the die side point Pd, generating a gap at the meshing point P. If is not 0 (zero), a pressure contact force or a gap will occur at the meshing point P.

[0107] In the Y direction, Ydp When Ydp is a positive value, the punch side point Pp is closer to 0 (the origin) than the die side point Pd. Therefore, the punch side point Pp is separated from the die side point Pd, and a gap is generated at the meshing point P. On the other hand, When the difference Ydp is negative, the point Pd on the die side is closer to 0 (the origin) than the point Pp on the punch side. Therefore, the point Pp on the punch side comes into contact with the point Pd on the die side, generating a pressure contact force at the meshing point P. When the difference Xdp is 0 (zero), the punch side point Pp may come into contact with the die side point Pd, generating a pressure force at the meshing point P, or the punch side point Pp may move away from the die side point Pd, generating a gap at the meshing point P. If is not 0 (zero), a pressure contact force or a gap will occur at the meshing point P.

[0108] When the gap at the meshing point P is appropriate, the cutting force (shear force) is stable, cutting into the flat material is smooth, and the cutting edge does not get caught in the recess. However, if the gap at the meshing point P is too large, the cutting force (shear force) is dispersed, making the cutting into the flat material unstable. Also, when the pressing force at the meshing point P is appropriate, the pressing force is added to the cutting force (shear force), making the cutting into the flat material more stable and smooth. However, if the pressing force at the meshing point P is too large, the pressing force exceeds the propulsion force of the meshing point P due to synchronous rotation, and galling of the cutting edge may occur.

[0109] As described above, in order to obtain a suitable cutting state for the flat material, it is preferable to satisfy the relationship 0 mm ≦ Dd-Dp ≦ 0.005 mm. From this viewpoint, it was decided to set the angle θp (θA, θB) that can realize the partial punch 1 having any of the configurations of evaluation conditions 1 to 18 by appropriately selecting the design conditions, etc. Specifically, the difference Ydp that may cause a gap at the meshing point P is If the value is positive, a gap of about 0.005 mm is considered to be acceptable, and the difference Ydp The appropriate upper limit of is set to 0.005 mm. In addition, the difference Ydp that may cause a pressure contact force at the meshing point P When the value is negative, the difference Ydp is calculated assuming that the ideal is 0 mm where no pressure is applied to the edge of the recess. The appropriate lower limit of the difference Ydp was set to 0 mm. The angle θp is in the range of 0 mm to 0.005 mm. The angle θp can be set to any one of the evaluation conditions 1 to 18 by appropriately selecting the design conditions. was determined to be a suitable position for providing the recess. Also, if the recess is provided at a position where the angle θp (θA, θB) from the meshing start point P1 exceeds 90 degrees, the position of the end of the recess in the Y direction will be closer to the origin (0) than the position of the start end. Therefore, the meshing point P passing through the recess is more likely to come into contact with the end of the recess as the angle θp increases. From this perspective, the difference Ydp The angle θp at which is 0.005 mm or less However, by appropriately selecting design conditions, etc., it is possible to realize a partial punch 1 having any of the configurations of evaluation conditions 1 to 18, and the angle θp at which the possibility of the engagement point P contacting the end portion of the recess is reduced is determined to be a more appropriate and preferable configuration.

[0110] FIG. 16 shows the rotation angle θp Difference Ydp The graph (plotted values ​​are omitted) shows the difference Xdp The graph shows a straight line (Y=a) parallel to the X-axis (θp), where a=0 for evaluation conditions 1 to 3, a=-0.0075 for evaluation conditions 4 to 6, and a=-0.015 for evaluation conditions 7 to 9. Also, FIG. 17 shows the difference Ydp with respect to the rotation angle θp for evaluation conditions 10 to 18 (Rdp=0.15). The graph (plotted values ​​are omitted) shows the difference Xdp The graph shows a straight line (Y=aX+b) with a constant gradient against the X-axis (θp), where a=0.0002 and b=0.00003 for evaluation conditions 10-12, a=0.0002 and b=-0.0075 for evaluation conditions 13-15, and a=0.0002 and b=-0.015 for evaluation conditions 16-18. Table 4 also shows the difference Ydp The angle θp is in the range of 0 mm to 0.005 mm. , i.e., 0 mm ≦ Ydp θp satisfies ≦0.005mm The minimum, median and maximum values ​​are shown.

[0111] [Table 4]

[0112] Angle θp As shown in Figs. 16 and 17 and Table 4, in evaluation conditions 1 to 3, the minimum value is 1 degree, so it is considered that there is no particular limitation (approximately 1 degree or more). In evaluation conditions 4 to 6, the minimum value is 68 degrees to 90 degrees, so it is considered that 90 degrees (approximately 90 degrees or more) from the meshing start point P1 is preferable. In evaluation conditions 7 to 9, the minimum value is 78 degrees to 90 degrees, so it is considered that 90 degrees (approximately 90 degrees or more) from the meshing start point P1 is preferable. In evaluation conditions 10 to 12, the minimum value is 63 degrees to 77 degrees, so it is considered that 77 degrees (approximately 80 degrees or more) from the meshing start point P1 is preferable. In evaluation conditions 13 to 15, the minimum value is 26 degrees to 30 degrees, so it is considered that 30 degrees (approximately 30 degrees or more) from the meshing start point P1 is preferable. Under evaluation conditions 16 to 18, the minimum value is 49 degrees to 60 degrees, so it is considered that 60 degrees (approximately 60 degrees or more) from the meshing start point P1 is preferable.

[0113] In addition, the angle θp As shown in FIG. 16, FIG. 17 and Table 4, the appropriate position on the side close to the meshing end point P2 is considered to be preferably 143 degrees (about 140 degrees or less) from the meshing start point P1 under evaluation conditions 1 to 3, since the maximum value is 143 degrees to 179 degrees. Under evaluation conditions 4 to 6, the maximum value is 111 degrees (about 110 degrees or less) from the meshing start point P1, since the maximum value is 111 degrees to 139 degrees. Under evaluation conditions 7 to 9, the maximum value is 102 degrees (about 100 degrees or less) from the meshing start point P1, since the maximum value is 102 degrees to 118 degrees. Under evaluation conditions 10 to 12, the maximum value is 89 degrees to 99 degrees, since the maximum value is 89 degrees (about 85 degrees or less) from the meshing start point P1, since the maximum value is 89 degrees to 103 degrees, since the maximum value is 89 degrees (about 85 degrees or less) from the meshing start point P1, since the maximum value is 89 degrees to 103 degrees. Under evaluation conditions 16 to 18, the maximum values ​​are 89 degrees to 111 degrees, so it is considered that 89 degrees (approximately 85 degrees or less) from the meshing start point P1 is preferable.

[0114] From the above simulation results, as shown in Table 4, under evaluation conditions 1 to 3, the angle θp There is no position that can be considered effective on the side close to the meshing start point P1, and the angle θp It was found that there is a position that is considered to be effective near the meshing end point P2, and the effective range is 1 degree to 143 degrees (approximately 140 degrees or less). It was found that there are positions that are considered to be effective on both the side close to the meshing start point P1 and the side close to the meshing end point P2, and that the effective range is 90 degrees to 111 degrees (approximately 90 degrees or more and approximately 110 degrees or less). It was found that there are positions that are considered to be effective on both the side close to the meshing start point P1 and the side close to the meshing end point P2, and that the effective range is 90 degrees to 102 degrees (approximately 90 degrees or more and approximately 100 degrees or less). It was found that there are positions that are considered to be effective on both the side close to the meshing start point P1 and the side close to the meshing end point P2, and that the effective range is 77 degrees to 89 degrees (approximately 80 degrees or more and approximately 85 degrees or less). It was found that there are positions that are considered to be effective on both the side close to the meshing start point P1 and the side close to the meshing end point P2, and that the effective range is 30 degrees to 89 degrees (approximately 30 degrees or more and approximately 85 degrees or less). It was found that there are positions that are considered to be effective on both the side closer to the meshing start point P1 and the side closer to the meshing end point P2, and that the effective range is 60 degrees to 89 degrees (approximately 60 degrees or more and approximately 85 degrees or less).

[0115] Here, we will supplement the position of the recesses provided on the die side or punch side, that is, the range of the angles θA and θB described above. For example, when cutting out chips Sw from a flat material S, if the recesses for leaving the flat material S uncut are located at θp If the meshing point P is in the range of 0 degrees to 90 degrees, the meshing start point P1 (θp is 0 degrees) to θp As the meshing point P moves toward the 90 degree position, the length of the cutting edge 10a of the die 10 in the Y direction (the opening width of the die 10) gradually increases. Therefore, the relative distance between the cutting edge 20a of the punch 20 and the end side (cutting end side) of the recess gradually increases. Therefore, the meshing point P moves toward the 90 degree position. When the angle is within the range of 0 degrees to 90 degrees, the cutting edge 10a of the die 10 and the cutting edge 20a of the punch 20 gradually move away from each other, making it difficult for them to get caught. On the other hand, when the concave portion for leaving the flat material S uncut is located at θp If the angle is within the range of 90 degrees to 180 degrees, the cutting depth of the meshing point P is θp From the position where the meshing end point P2 (θp As the meshing point P moves toward θp (180 degrees), the length of the cutting edge 10a of the die 10 in the Y direction (opening width of the die 10) gradually becomes smaller. Therefore, the relative distance between the cutting edge 20a of the punch 20 and the end side (cutting end side) of the recess gradually becomes smaller. Therefore, the meshing point P moves toward θp When the angle θp is within the range of 90 degrees to 180 degrees, the cutting edge 10a of the die 10 and the cutting edge 20a of the punch 20 gradually approach each other, making them more likely to get caught. If the position of the recess is selected from this viewpoint, the cutting edge 10a of the die 10 and the cutting edge 20a of the punch 20 are less likely to get caught. can be selected within the range of more than 0 degrees to 90 degrees.

[0116] From the above, the angle θp The appropriate position on the side close to the meshing start point P1 is the angle θp In consideration of the need to set the angle θp at 30 degrees or more, more preferably at 40 degrees or more, and even more preferably at 50 degrees or more, it is determined that the angle θp The appropriate position on the side close to the meshing end point P2 is the angle θp In addition to setting the angle at 110 degrees, in order to reduce the possibility of the meshing point P contacting the end portion of the recess, it has been determined that it is appropriate to set the angle at 100 degrees or less, preferably at 95 degrees or less, and even more preferably at 90 degrees or less, while taking into consideration not to exceed 110 degrees.

[0117] Therefore, it was determined that it is appropriate to configure the recesses provided on the die side or punch side of the partial punch 1 so that the above-mentioned angles θA and θB are preferably in the range of 30 degrees or more and 100 degrees or less, and more preferably in the range of 30 degrees or more and 90 degrees or less. It was also determined that the lower limit of the above-mentioned angles θA and θB of the recesses provided on the die side or punch side is more preferably 40 degrees or more, and even more preferably 50 degrees or more. It was also determined that the upper limit of the above-mentioned angles θA and θB of the recesses provided on the die side or punch side is more preferably 95 degrees or less, and even more preferably 90 degrees or less.

[0118] From the above, it has been confirmed that the angles θA and θB corresponding to the position where the recesses are to be provided can be set in ranges such as, for example, 30 degrees or more and 100 degrees or less, 30 degrees or more and 95 degrees or less, 30 degrees or more and 90 degrees or less, 40 degrees or more and 100 degrees or less, 40 degrees or more and 95 degrees or less, 40 degrees or more and 90 degrees or less, 50 degrees or more and 100 degrees or less, 50 degrees or more and 95 degrees or less, and 50 degrees or more and 90 degrees or less, depending on various conditions such as the flat material (material, thickness, remaining cut width, etc.) and the recesses (number, shape, etc.).

[0119] As described above, the present invention can provide the partial punch 1 having the above-mentioned configuration. The partial punch 1 having the above-mentioned configuration serves as a rotary punch unit that has a reasonable level of practicality and prevents chips (punched pieces) from adhering to the flat material (material to be punched) and from entering the rotary punch unit or ancillary devices. [Explanation of symbols]

[0120] 1: Punch unit, partial punch <Dice related> 10: die, 10a: cutting edge, 10b: edge (edge ​​of corner), 11: first shaft, 12: gear, 13: scissors gear, 14: frame, 15: circumferential surface (circle of outermost rotation path of die), 101, 102, 103: recesses, Dd: inner diameter of die (hole), Rd: rotation radius of die, Od: axis (center of rotation of die), Vd: peripheral speed of outermost die <Punch related> 20: punch, 20a: cutting edge, 20b: edge (corner edge), 20c: side surface (near the corner edge), 21: second shaft, 22: gear, 25: circumferential surface (outermost rotation locus circle of punch), 201, 202, 203: recess, Dp: outer diameter of punch (convex part), Rp: rotation radius of punch, Op: axis (rotation center of punch), Vp: outermost peripheral speed of punch <Flat materials> S: Flat material (material to be drilled), Sw: Chips (also used for circular holes), S1: Uncut part, S2: Uncut part, S3: Uncut part, SA: 1st cutting line, SB: 2nd cutting line <Engagement relationship> P: meshing point (drilling point), P1: meshing start point (drilling start point), P2: meshing end point (drilling end point), PA, PB: meshing points (a pair of points that move simultaneously and symmetrically from P1 to P2) <Other> PL: pass line, Ldp: center distance, Lz: overlap amount, C1: gap (starting point of meshing), C2: gap (end point of meshing), α: meshing angle, ZA: arrow, ZB: arrow

Claims

1. a rotary punch unit in which an engagement portion formed of a cutting edge of a die provided on a first shaft rotating in one direction and a cutting edge of a punch provided on a second shaft which is parallel to the axial direction of the first shaft and rotates synchronously with the first shaft in a direction opposite to the first shaft, forms a semicircular first cutting line in one direction and a semicircular second cutting line in the other direction while moving from an engagement start point to an engagement end point, and cuts chips from a flat material supplied between the die and the punch to form a circular hole, A rotary punch unit that cuts out the chips, which are connected to the flat material at one to three locations, at positions corresponding to one to three recesses provided on either the cutting edge of the die or the cutting edge of the punch.

2. 2. The rotary punch unit according to claim 1, The chips are cut out at a position corresponding to the recess provided in any one of the following (1-1), (1-2), and (1-3), and are connected to the flat material at one point. (1-1) A point corresponding to the end point of engagement of either the cutting edge of the die or the cutting edge of the punch (1-2) A location corresponding to any one point on the first cutting line within an angle range of 30 degrees or more and 100 degrees or less around one side of the center point of the circular hole from the meshing start point of either the cutting edge of the die or the cutting edge of the punch toward the meshing end point. (1-3) A point corresponding to any one point on the second cutting line within an angle range of 30 degrees or more and 100 degrees or less around the center point of the circular hole from the meshing start point of either the cutting edge of the die or the cutting edge of the punch toward the meshing end point of the other.

3. 2. The rotary punch unit according to claim 1, The chips are cut out at positions corresponding to the two recesses provided in the flat material by any one of the following methods (2-1), (2-2), and (2-3), so that the chips are connected to the flat material at two points. (2-1) A combination of a location corresponding to an end point of meshing of either the cutting edge of the die or the cutting edge of the punch, and a location corresponding to any one point on the first cutting line within an angle range of 30 degrees or more and 100 degrees or less around the center point of the circular hole from the start point of meshing of either the cutting edge of the die or the cutting edge of the punch toward the end point of meshing. (2-2) A combination of a location corresponding to an end point of meshing of either the cutting edge of the die or the cutting edge of the punch, and a location corresponding to any one point on the second cutting line within an angle range of 30 degrees or more and 100 degrees or less around the other of the center point of the circular hole from the start point of meshing of either the cutting edge of the die or the cutting edge of the punch toward the end point of meshing. (2-3) A combination of a location corresponding to any one point on the first cutting line within an angle range of 30 degrees or more and 100 degrees or less around the center point of the circular hole from the meshing start point of either the cutting edge of the die or the cutting edge of the punch toward the meshing end point, and a location corresponding to any one point on the second cutting line within an angle range of 30 degrees or more and 100 degrees or less around the center point of the circular hole from the meshing start point of either the cutting edge of the die or the cutting edge of the punch toward the meshing end point.

4. 2. The rotary punch unit according to claim 1, According to the following (3-1), the chips are cut out at positions corresponding to the three recesses provided in the three places, so that the chips are connected to the flat material at three points. (3-1) A combination of a location corresponding to an end point of meshing of either the cutting edge of the die or the cutting edge of the punch, a location corresponding to any one point on the first cutting line within an angle range of 30 degrees or more and 100 degrees or less around the center point of the circular hole from the start point of meshing of either the cutting edge of the die or the cutting edge of the punch toward the end point of meshing, and a location corresponding to any one point on the second cutting line within an angle range of 30 degrees or more and 100 degrees or less around the center point of the circular hole from the start point of meshing of either the cutting edge of the die or the cutting edge of the punch toward the end point of meshing.

5. 2. The rotary punch unit according to claim 1, When an inner diameter of a cutting edge of the die is Dd and an outer diameter of a cutting edge of the punch is Dp, a relationship of 0 mm≦Dd−Dp≦0.005 mm is satisfied, and the cutting edge of the die and the cutting edge of the punch are configured to be in pressure contact with each other at a meshing start point, When the radius of rotation of the cutting edge of the die is Rd and the radius of rotation of the cutting edge of the punch is Rp, the relationship Rd-Rp>0 mm is satisfied, and the cutting edge of the die and the cutting edge of the punch are configured to be in pressure contact at the end point of engagement.

6. 6. The rotary punch unit according to claim 5, It is configured to satisfy the relationship: 0.10 mm≦(Rd−Rp)≦0.40 mm.

7. 7. The rotary punch unit according to claim 5 or 6, When the cutting edges of the die and the punch are brought into pressure contact at the start point of engagement, the angle formed by a line segment connecting the start point of engagement of the cutting edges of the die and the center of rotation of the die, and a line segment connecting the center of rotation of the die and the center of rotation of the punch, is α, and the angle is configured to satisfy the relationship 0 degrees < α ≦ 15 degrees.

8. 7. The rotary punch unit according to claim 5 or 6, The cutting edges of the die are configured to satisfy the relationship 0.02 mm≦(Rd−Rp)·β≦0.10 mm, where β (radian) is the angle that the engagement start point and engagement end point make with respect to the center of rotation of the die.

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