JP5753976B2 - Punch material punching method, punching device and printed circuit board - Google Patents

Description

  The present invention relates to a punching method for punching a plate material, a punching apparatus, and a printed circuit board.

  Fibrous shading or the like at the time of punching a plate-shaped material such as a flexible printed circuit board composed of a composite region composed of a metal (copper, etc.) and a resin (polyimide, PET, etc.) and a base material region composed only of a resin The mechanism for generating particle-like debris is different from the general mechanism for generating burrs in metal punching. If such whiskers or debris separates from the cut surface of the flexible printed circuit board and adheres to the metal wiring of the product punched from the plate-like material, it causes poor electrical contact in the joining process with the terminal in the subsequent process. Various problems may occur. Therefore, there has been a demand for a punching method that reduces whirling or debris during punching.

  In order to achieve this purpose, conventionally, a cutting method of a cutting tool of a machining tool as shown in FIG. 6 is punched with a minute roundness, or a workpiece as shown in FIG. The construction method is used.

  In the construction method shown in FIG. 6, the base material is punched by bringing the convex tool 3a and the concave tool 3b facing the cutting blades close to each other while maintaining the mutual clearance with respect to the plate-like material 6 which is a workpiece. ing. The cutting edges of the convex tool 3a and the concave tool 3b are provided with minute roundness (tool tip radius) 50a, 50b of size R0. Here, R0 = 2 to 8 μm.

  In the construction method shown in FIG. 7, the plate-like material 6 is sandwiched between the convex tool 3a and the convex material presser 51b, or between the concave tool 3b and the concave material presser 51a, and the convex tool 3a and the concave tool 3b are approached while applying pressure. By doing so, the plate-like material 6 is punched out.

  The example of the processing tool and production equipment used by the said construction method is shown to Fig.8 (a)-(c). A plate-shaped material is punched using a convex tool 3a having the same planar shape as the product shown in (a) and a concave tool 3b having a hole shape with a certain amount of clearance from the side surface of the convex tool 3a shown in (b). Moreover, (c) has shown the conceptual diagram which punches the plate-shaped material 6 in a predetermined shape in a punching apparatus. While the plate-like material 6 which is long in the lateral direction is sequentially fed in the direction of the arrow 30, the first region 6a is punched into a predetermined shape by the mold part 31 having the above-mentioned convex tool and concave tool, and is taken out as a product using a take-out mechanism. The first area 6a is taken out. The second region 6b (scrap side) having the outer periphery of the first region 6a left inside the mold unit 31 as the inner periphery is sequentially discharged from the mold unit 31.

Japanese Patent Laid-Open No. 62-46433

  However, the above-described punching method has a problem that whiskering or debris frequently occurs at the time of punching due to changes in the plate-like material such as a reduction in the plate thickness in recent years.

  In general, the cross section of a product or scrap that is sheared by two opposing tool tips, in the case of a resin material used as a base material of a flexible printed circuit board or the like, due to the stress distribution on the material, FIG. A cut surface as shown in (d) is formed. The in-material position Z is divided into Z1 to Z4 as shown in FIG. 9 with respect to the plate thickness of the plate-like material. The position Z1 is on the concave tool 3b side, and the position Z4 is on the convex tool 3a side.

  Fig. 9 (a) ... When the shear stress is excessively concentrated on the tip of the convex tool 3a compared to the tip of the concave tool 3b, or the tensile stress is applied to the material on the convex tool 3a side compared to the concave tool 3b side. If there is, the amount of progress from the convex tool 3a side in the convex tool side primary fracture surface 14a on the material cutting surface becomes large, and the final fracture surface 13 is formed at a position Z1 near the surface of the plate-like material 6 near the concave tool 3b. .

  9 (d) ... Contrary to FIG. 9 (a), when the shear stress is excessively concentrated on the tip of the concave tool 3b compared to the tip of the convex tool 3a, or the concave tool 3b compared to the convex tool 3a side. When a tensile stress is applied to the material on the side, the amount of progress from the concave tool 3b side of the concave tool side primary fracture surface 14b in the material cutting surface increases, and the plate-shaped material whose final fracture surface 13 is close to the convex tool 3a. 6 is formed at a position Z4 in the vicinity of the surface.

  9 (b)... Compared with FIG. 9 (a), when the relationship between the concentration of shear stress and the tensile stress applied to the material is slightly relaxed toward the concave tool 3b, the final fracture surface 13 is recessed from the center of the material. It is formed at a position Z2 closer to the tool 3b and closer to the center of the material as compared with FIG. 9A.

  9 (c)... Compared with FIG. 9 (d), when the relationship between the concentration of shear stress and the tensile stress applied to the material is slightly relaxed toward the convex tool 3a, the final fracture surface 13 is convex from the center of the material. It is formed at a position Z3 closer to the tool 3a and closer to the center of the material as compared with FIG. 9 (d).

  The amount of whisker / scratches generated from the cross section varies depending on the material internal position Z of the final fracture surface 13.

  First, with respect to whisker burr, when the final fracture surface 13 is located at positions Z1 and Z2 on the concave tool 3b side, as in the cut surfaces of FIGS. 9A and 9B, the whisker burr 17 generated from the final fracture surface 13 is It occurs on the second region 6b side (scrap side). Since whiskering occurs in one of the product or scrap, no whiskering on the first region 6a side (product side) occurs in these cross sections.

  On the other hand, when the final fracture surface 13 is on the convex tool 3a side as in the cut planes of FIGS. 9C and 9D, the shading 17 generated from the final fracture surface 13 occurs on the first region 6a side. .

  Scratches are likely to occur when the final fracture surface 13 is located at positions Z1 and Z4 close to the material surface as in the cut surfaces of FIGS. 9 (a) and 9 (d). The reason for this is that there is a large bulge in the cross section on the first region 6a side or the second region 6b side. Therefore, in the continuous movement operation 32 of the tool after punching, the bulge of the cross section is rubbed with the side surface of the tool. 18 is considered to be generated.

  Regardless of whether the scrap is generated on the first region 6a side or the second region 6b side, it may be separated from the first region 6a and the second region 6b in the subsequent mold operation and reattached to the tool or product. There is. Therefore, in order to suppress the scratches in the first region 6a, the in-material position Z must aim at Z2 and Z3 as shown in the cut planes of FIGS. 9B and 9C.

  For the above reason, the optimum cut surface that does not generate shading on the product side is FIG. 9B, and the position of the final fracture surface 13 is Z2. For the plate thickness T shown in FIG. 9 (a), the optimum position Z2 of the final fracture surface that suppresses whisker scraps is, for example, the position Z = 0.5 from the convex tool 3a side when the base material is polyimide. It is a region of × T to 0.8 × T. When the material is PET, the region is Z = 0.5 × T to 0.75 × T.

  On the other hand, in the conventional method of adding a small roundness to the tool tip shown in FIG. 6, there is no limitation on the relative size of the small roundness (50a, 50b) on the convex tool 3a side and the concave tool 3b side. The stress distribution generated inside the plate-like material is affected by the three-dimensional stress inside the material depending on the material and shape to be punched, and the ideal final fracture surface position cannot be controlled within the range of Z2. Often occurs.

  In particular, when the plate-like material is a flexible printed circuit board, in the composite area 42 (wiring area) composed of metal and resin as shown in FIG. 3A, or in the corner portion of the product shown in FIG. The stress distribution inside the material becomes complicated, and the position Z of the final fracture surface often varies up and down in the cross section.

  Therefore, there is a problem that whiskering / scratching is likely to occur at the boundary or corner portion between the composite region 42 of the flexible printed circuit board and the base material region 40 made of resin.

  In particular, since the position Z2 of the ideal final fracture surface is limited to a small range due to the recent reduction in the thickness of the flexible printed circuit board, the aforementioned control becomes more difficult, and there are frequent whirling or scratches.

  Further, in the conventional method of restraining the plate-like material shown in FIG. 7 with the material pressers 51a and 51b, the plate-like material 6 is restrained even after the punching operation, so that the concave tool 3b or the convex tool 3a and the plate-like material 6 are restrained. There is a problem of rubbing and frequent waste.

  In view of the above, the present invention controls the stress applied to the plate-like material 6 to form the final fracture surface 13 within the range of the material internal position Z2 in FIG.・ The purpose is to form a cross-section where scratches are unlikely to occur. Another object of the present invention is to solve the above-described conventional problems, and to provide a punching device for a plate-like material and a punching method thereof that can suppress the occurrence of whiskers and scratches.

In order to achieve the above object, the present invention provides a convex tool and a concave tool for dividing a plate-like material into a first region having a predetermined shape and a second region having an outer periphery of the first region as an inner periphery. Is used to punch the plate-like material into the predetermined shape,
The punching method of the plate-like material of the present invention includes a first step of cutting the second region with a cutting line that divides the second region into two or more regions, and a second region corresponding to each region divided in the first step. Using the convex tool and the concave tool, the relationship between the tool tip radius of the convex tool and the ratio of the tool tip radius of the concave tool is different in each of the two adjacent areas with respect to the inner peripheral portion, And a second step of punching the plate-like material.

  The punching device for a plate-like material according to the present invention includes a cutting tool for cutting the second region by a cutting line that divides the second region into two or more regions, and a second region corresponding to each region divided by the cutting tool. The convex tool and the concave tool having different ratios of the ratios of the tool tip radius of the convex tool and the tool tip radius of the concave tool in the two adjacent areas with respect to the inner peripheral portion. It is characterized by.

  With this configuration, the final fracture surface of the cut surface can be arranged at a desired position by controlling the stress distribution with respect to the plate-like material to be punched.

  As described above, according to the punching method and the punching device for a plate-like material of the present invention, the final fracture surface can be arranged at a desired position, and the occurrence of shavings and scraps on the product side can be suppressed.

The figure which shows the structure of the metal mold | die / cutting tool in this embodiment, and the structure of plate-shaped material The figure which shows operation | movement (a)-(h) of the metal mold | die in this embodiment. The figure which shows the arrangement position of the final fracture surface of the base material area | region and composite area | region in this embodiment The figure which shows the arrangement position of the final fracture surface of the product corner part in this embodiment, the bending moment concerning a corner part, and the material bending direction of a corner part The figure which shows the arrangement | positioning relationship between the planar shape of the other product side material in this embodiment, and a cutting tool (Conventional example 1) A diagram showing a cutting edge having a micro-roundness of a mold tool (Conventional example 2) Diagram showing material presser for restraining work material Diagram showing machining tool shape / production equipment operation example Diagram showing the relationship between the punched cross-sectional shape and the shading

  Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. In addition, the same code | symbol is used about the same component as FIGS. 6-9, and description is abbreviate | omitted. In addition, since the examples described below are preferable specific examples of the present invention, various technically preferable limitations are given. However, the scope of the present invention particularly limits the present invention in the following description. As long as there is no description of the effect, it is not restricted to these aspects.

(Embodiment)
1 (a) shows the structure of the lower mold, FIG. 1 (b) shows the structure of the upper mold, FIG. 1 (c) is a sectional view after the combination of the upper and lower molds, and FIG. The AA 'cross section of (b) is shown. In a mold composed of a mold guide post 4a and a mold guide bush 4b that are slidably fitted to each other, a convex tool 3a is disposed on the lower mold, and a concave tool 3b is disposed on the upper mold. In the configuration, when the concave tool 3b is lowered, the plate-like material 6 disposed on the convex tool 3a is punched into a predetermined shape. Here, the plate-like material 6 is, for example, a flexible printed circuit board composed of a base material region made of only a resin having a thickness of 50 μm and a composite region made of a metal and resin having a thickness of 75 μm. Here, the base material region is made of polyimide, and the composite region is made of a copper foil and polyimide.

  The concave tool 3b of the upper mold is attached to the upper die set plate 1b, and the convex tool 3a of the lower mold is attached to the lower die set plate 1a via the lower backing plate 2a. Around the convex tool 3a of the lower mold, a cutting tool 9 for cutting and cutting into a plate-like material (second region) on the scrap side, a holder plate 10 for fixing the cutting tool 9, and a holder plate 10 An elastic body structure 11 (spring or the like) is disposed that positions the upper limit while applying a force upward.

  The lower mold is provided with a material guide 5 for conveying a plate-like material (flexible printed circuit board) 6 and operates up and down. The upper limit of the operating range is set so that the upper surface of the material guide 5 is above the upper surface of the convex tool 3a, and the lower limit is the position where the upper surface of the material guide 5 is lower than the upper surface of the convex tool 3a.

  The lower mold convex tool 3a, lower backing plate 2a, and lower die set plate 1a are provided with a flow path 7 for adsorbing and fixing a plate-like material (first region).

  Further, the tips of the convex tool 3a and the concave tool 3b are respectively machined to a tool tip radius 50a (convex tool side) and a tool tip radius 50b (concave tool side), and the magnitude relationship of the values depends on the cutting position of the product to be described later. Is different.

  FIG.1 (d) has shown the arrangement position of the cutting tool 9 in this embodiment, and the structure of plate-shaped material (flexible printed circuit board). The flexible printed circuit board is composed of two types of resin material 6c (polyimide, PET, etc.) and metal material 6d (copper foil, etc.). In this configuration, as shown in FIG. The boundary area 41 and the composite area 42 are divided. The base material region 40 is a region composed only of resin (resin material 6c), and the composite region 42 is a region composed of resin (resin material 6c) and metal (metal material 6d). This is a region where the metal material 6d is arranged on the surface of 40 (preferably the metal material 6d is arranged periodically). The boundary region 41 is a region where the metal materials 6 d are arranged at the end of the composite region at the boundary between the base material region 40 and the composite region 42.

  The cutting tool 9 is installed so that the 2nd area | region 6b shown in FIG.8 (c) can be cut | disconnected by the cutting line which divides into two or more several areas. This cutting line is a line that overlaps at least one of the boundary line between the base material region (FIG. 1D) and the composite region (FIG. 1D) or a line extended from the boundary line. Further, when the punched shape is a shape including a corner as in the outer peripheral shape of the first region 6a shown in FIG. 8C, the vertex of the corner of the first region is on the extended line of the cutting line. Has been placed.

  For this reason, in this structure, as shown to Fig.1 (a), the cutting tool 9 is installed in the 2nd area | region corresponding to four corners and four boundaries (or the extension part) of a base material area | region / boundary area | region. Then, the installed part (scrap side) can be cut.

In addition, the size relationship and the ratio (tool ratio) of the tool tip radii 50a and 50b at the tip of the machining tool are changed as follows. Here, the tool ratio is the ratio of the concave tool tip radius 50b to the convex tool tip radius 50a.
Base material region 40: convex tool tip radius 50a <concave tool tip radius 50b, 50b / 50a> 1.

Boundary region 41: regardless of the size of the convex tool tip radius 50a and the concave tool tip radius 50b.

Compound area 42: convex tool tip radius 50a> concave tool tip radius 50b, 50b / 50a <1.

  By making "convex tool tip radius 50a <concave tool tip radius 50b", it is possible to increase the amount of progress of the primary fracture surface on the convex tool side on the material cutting surface and move the position of the final fracture surface to the concave tool side. And In addition, by setting “convex tool tip radius 50a> concave tool tip radius 50b” based on the same principle, the position of the final fracture surface can be moved to the convex tool side. In this way, depending on the configuration of the plate-like material 6, the difference in the shear stress at the time of punching of the product is made by making a relative difference in the tool tip radius amount of the cutting edge shape of the concave tool and the convex tool in each region. It is possible to control the position of the final fracture surface.

  In the present configuration, the reason why the relationship between the tool tip radii 50a and 50b and the tool ratio is changed as described above will be described together with the description of the shading / scratch suppressing mechanism described later.

  As for the tool tip radius, for example, when the thickness of the plate-like material 6 is T, in the base material region 40, the convex tool tip radius 50a is within the range of (0.01 to 0.05) × T. And the concave tool tip radius 50b is set within the range of (2 to 10) × (convex tool tip radius 50a). Further, in the composite region 42, the concave tool tip radius 50b is in the range of (0.01 to 0.05) × T, and the convex tool tip radius 50a is (2 to 10) × (concave tool tip radius 50b. ).

  In addition, among a plurality of areas divided by cutting lines, two adjacent areas are defined as A area (one area) and B area (the other area). While the relationship between the tool ratio in the A area and the tool ratio in the B area is different, the tool ratio in the A area (or the size of the tip radius) is gradually changed to the tool ratio in the B area (or the size of the tip radius). A section is provided at the end of area A or the end of area B. This section is set as the adjustment section. By providing the adjustment section, the tool tip radius 50a or 50b can be smoothly changed between the sections, and the burden on the tool tip due to punching can be reduced. Further, the appearance after punching is not impaired.

  Further, this adjustment section is optimally provided in the boundary region 41 that is the end of the composite region 42. This is because the boundary region is a region that is not affected by the size (magnitude relationship) of the tool tip radii 50a and 50b and the tool ratio, as will be described later. In this configuration, in the boundary region 41, the tool ratio in the base material region 40 (assumed as A section) is changed stepwise to the tool ratio in the composite region 42 (assumed as B section).

  Specifically, when the plate thickness T is 50 μm, in the base material region 40, the convex tool tip radius 50a is in the range of “0.5 μm to 2.5 μm” and the concave tool tip radius 50b is in the range of “1.0 μm to 25 μm”. Set in. In the composite region, the convex tool tip radius 50a can be set within the range of “1.0 μm to 25 μm”, and the concave tool tip radius 50b can be set within the range of “0.5 μm to 2.5 μm”.

  FIG. 1E shows the arrangement of the cutting tool 9 and the holder plate 10. The tip of the cutting tool 9 has an edge shape of an angle α, and the tip of the cutting blade is fixed at a position lower than the B surface of the holder plate 10 by a height K. The relationship between the height K and the tip angle α is that cutting (cutting) occurs when the cutting tool 9 having the tip angle α is pushed from the material surface by the height K with respect to the base material having the thickness T to be cut. Set to value. For example, when polyimide is used as the base material, K is set to a value such that T ≧ K ≧ 0.8 × T with respect to the plate thickness T, and the tip angle α is set to 15 ° to 30 °.

  2 (a) to 2 (h) show the operation of the mold in the present embodiment. 2 shows a cross-section AA ′ as in FIG. 1C, and h (h0, h1, h2) in the figure is the upper surface of the upper die set plate 1b and the lower surface of the lower die set plate 1a. Represents distance.

  FIG. 2 (a)... First, the plate-like material 6 (flexible printed circuit board) is transported to a cutting position in the mold in a state of top dead center (h = h0).

  FIG. 2B... Next, the material guide 5 is lowered, and the plate-like material 6 (flexible printed circuit board) is brought into contact with the cutting blade of the cutting tool 9.

  FIG. 2 (c)... Starts the lowering of the upper die, the cutting edge of the concave tool 3b of the upper die comes into contact with the plate material, and the flexible printed circuit board is connected to the leading edge of the concave tool 3b and the cutting tool 9. Let's squeeze (h = h1).

  FIG. 2D... When the upper mold is further lowered to h = h2, the concave tool 3b comes into contact with the upper surface of the holder plate 10. At this time, due to the spring force (elastic body structure 11) that pushes up the holder plate 10, a sufficient force necessary for cutting acts on the flexible printed circuit board, and a part of the scrap of the base material is cut.

  FIG. 2 (e)... When the upper die is lowered to h = h3 and reaches the bottom dead center, the material is divided into the first region and the second region, and the cutting is completed.

  FIG. 2 (f): After reaching the bottom dead center, the product is sucked and fixed onto the upper surface of the convex tool through the convex tool of the lower mold, the lower backing plate, and the flow path 7 of the lower die set plate. Thereafter, the upper mold is returned to the top dead center h = h0.

  FIG. 2 (g)... The first area 6a (product) is released from suction and the product is taken out.

  FIG. 2 (h): The material guide 5 is raised.

  Thereafter, FIGS. 2A to 2H are repeated.

  In the following, a description will be given of a beard / scratch suppression mechanism when this embodiment is used. In particular, attention will be paid to places where beards and scraps are likely to occur, and in the first region, the base material region / composite region and its boundary will be described in FIG. 3, and the corner portion will be described in FIG. At that time, when the present invention is applied (installation of the cutting tool 9 / the tool tip radius / ratio relationship of the tool tip) and when not applied (no cutting tool 9 / the tool tip radius / ratio relationship of the tool tip) Compare the cross sections.

  FIG. 3A is a cross section of the base material region 40, the boundary region 41, and the composite region 42 of the first region 6a, and shows the position of each final fracture surface. The final fracture surface when the present invention is applied is shown in 13a, and the non-application case is shown in 13b.

  In the metal material 6d such as the boundary region 41, the fracture on the metal side is less accelerated than the base material regardless of whether the invention is applied or not. Therefore, the final fracture surfaces 13a and 13b are made of metal or metal and base material. Occurs at the border. For this reason, no whiskering / scratch occurs in the metal material 6d.

  On the other hand, in the base material region 40, when the present invention is not applied, the final fracture surface 13b is affected by a metal that is difficult to cut, and the fracture surface 13b is generated near the boundary between the metal and the base material near the boundary region 41. To do. Moreover, if it leaves | separates from the boundary area | region 41, it will become the fracture | rupture positions Z2-Z3 at the time of punching only a base material. Therefore, the final fracture surface varies in the positions of Z1 to Z3 within the plate thickness, and the whiskers and scraps are likely to occur.

  On the other hand, after the present invention is applied, since the internal stress generated at the boundary of the boundary region 41 of the base material region 40 is alleviated due to the presence of the scrap cutting 15 by the cutting tool 9, first, the final of the base material region 40 The fracture surface 13a is stabilized near the position Z3. In addition to this, as shown in FIG. 3 (b), the position Z3 of the final fracture surface changes in the upward direction 60 due to the presence / absence of the tool tip radius (convex tool tip radius 50a <concave tool tip radius 50b). , Formed at the position Z2, and no whisker / scratch occurs.

  In the composite region 42, when the present invention is not applied, the metal material portion is affected when the resin material portion is cut, and the final fracture surface 13b is generated near the metal / resin boundary Z1. Therefore, it becomes easy to generate scraps.

  After the present invention is applied, as shown in FIG. 3C, the position Z1 of the final fracture surface is in the downward direction 61 due to the presence of the magnitude relationship of the tool tip radius (convex tool tip radius 50a> concave tool tip radius 50b). And is formed at the position Z2, and no debris is generated.

  Next, the corner | angular part of the product of FIG. 4 is demonstrated.

  FIG. 4A is a cross-sectional view of the corner portion of the first region 6a and shows the position of the final fracture surface. The left side is the corner of the product. The final fracture surface when the present invention is applied is shown in 13a, and the non-application case is shown in 13b.

  When the present invention is not applied, the final fracture surface 13b in the vicinity of the corner of the product is formed at the positions Z3 to Z4, and the whisker is likely to occur. The factor will be described with reference to FIGS. Generally, in a shearing process using a concave tool or a convex tool, a moment 70 is applied to the material at the time of cutting. In particular, in the corner portion of the product, the deformation of the material is limited by the superposition of moments, and the material such that the concave tool side is convex in the cross section in the 45 degree direction of the corner portion of the product as shown in (c). Bends and deforms. By this bending, as shown in (d), compressive stress 20 is generated on the convex tool 3a side, and simultaneously, tensile stress 21 is generated on the concave tool 3b side. By this, the fracture | rupture from the concave tool side becomes easy to be accelerated | stimulated, and the position Z3-Z4 below material becomes a final fracture surface.

  On the other hand, after application of the present invention, due to the presence of the scrap cutting 15 by the cutting tool 9 shown in FIG. 4A, the moment 70 shown in FIG. The tensile / compressive stress of d) is relaxed and the fracture surface position is stabilized at Z3. In addition, due to the presence / absence of the tool tip radius shown in (d) (convex tool tip radius 50a <concave tool tip radius 50b), the position Z3 of the final fracture surface changes in the upward direction 62 and is formed at the position Z2. , No whiskers and scraps.

  In the present embodiment, the cutting tool 9 is installed and cut at four places facing the corners of the punched shape and at the four borders of the base material region 40 and the boundary region 41 (or an extension thereof). Depending on the shape of the printed circuit board to be punched and the configuration (raw material) of the plate-like material, the installation location (number) may be different. For example, as shown in FIG. 5, the planar shape of the first region 6a to be punched has a first angle (the product side of the angle where two straight lines intersect is 190 degrees or more and 350 degrees or less) and a second corner (two straight lines). When the crossing angle is 10 degrees or more and 170 degrees or less), and the plate-like material is made of a resin base material, the cutting tool 9 has all the first and second corners as shown in FIG. Install in the vicinity. As a result, even in the punching of a complicated planar shape, it is possible to divide planar stress and to obtain a uniform cross section. Similarly, the size (ratio) of the tool tip radius of the concavo-convex tool in two adjacent areas differs depending on the configuration (material) of the plate-like material.

  Moreover, in this embodiment, although it cuts with the cutting tool 9 which has an elastic body structure, the structure of the cutting tool 9 is not this limitation. Since the cutting tool 9 of this embodiment is supported by an elastic structure, a force sufficient to cut by a spring force acts as described in the operation of the mold of FIG. Regardless of the configuration (thickness), it can be cut efficiently and the cut surface is also clean.

  The plate-like material punching method according to the present invention can perform punching while suppressing the occurrence of whirling and debris without pinching a product in punching a flexible printed board. Therefore, the resist surface of the material is not scratched, and it is possible to prevent the wiring from being exposed and causing a short circuit or corrosion. In addition, since there are few shadings and scraps generated from the cross section, it is possible to improve production efficiency by eliminating a cleaning step in production in a clean room or in an automated or semi-automated production process.

1a Lower die set plate 1b Upper die set plate 2a Lower backing plate 3a Convex tool 3b Concave tool 4a Mold guide post 4b Mold guide bush 5 Material guide 6 Plate material 6a First region (product side)
6b 2nd area (scrap side)
6c Resin material 6d Metal material 7 Flow path 9 Cutting tool 10 Holder plate 13 Final fracture surface 13a Final fracture surface (when the present invention is applied)
13b Final fracture surface (when the present invention is not applied)
14a Convex tool side primary fracture surface 14b Concave tool side primary fracture surface 15 Scrap cutting 17 Higebari 18 Scrap 20 Convex tool side compressive stress generated in material 21 Concave tool side tensile stress generated in material 31 Mold part 40 Base material area 41 Boundary area 42 Composite area 50a (convex) Tool tip radius (convex tool side)
50b (concave) tool tip radius (concave tool side)
51a Material presser (convex tool side)
51b Material presser (concave tool side)
70 moment

Claims (10)

In order to divide the plate-shaped material into a first region having a predetermined shape and a second region having an outer periphery of the first region as an inner periphery, a convex tool and a concave tool are used to convert the plate-shaped material into the predetermined region. A punching method that punches into a shape,
A first step of cutting the second region with a cutting line dividing the second region into two or more areas;
The ratio of the tool tip radius of the convex tool to the tool tip radius of the concave tool in each of the two adjacent areas with respect to the inner circumference of the second region corresponding to each area divided in the first step And a second step of punching the plate-like material using the convex tool and the concave tool having different tool ratio relationships.   The plate-like material is composed of a base material region composed of only a resin and a composite region composed of a metal and a resin, and the cutting line in the first step includes at least the composite region and the base material. 2. The punching method for a plate-like material according to claim 1, wherein the punching method overlaps either a boundary line with a region or a line extended from the boundary line.   The area in which the first region between the two extension lines of the adjacent cutting lines is the composite region has a tool tip radius of the convex tool larger than a tool tip radius of the concave tool. A method for punching a plate-like material according to claim 2.   The outer periphery shape of the said 1st area | region is a shape containing a corner | angular part, and the vertex of the corner | angular part of the said 1st area | region is arrange | positioned on the extension line | wire of the said cutting line. The punching method of the plate-shaped material in any one.   The two adjacent areas are set as one area and the other area, and an adjustment section that gradually changes from the tool ratio of the one area to the tool ratio of the other area is an end of the one area. Or it has in the edge part of said other area, The punching method of the plate-shaped material in any one of Claims 1-4 characterized by the above-mentioned.   6. The plate material punching method according to claim 5, wherein the adjustment section exists in an area in which the first region between two adjacent cutting lines is the composite region.   A printed circuit board punched out by a punching method for a plate-like material according to any one of claims 1 to 6. In order to divide the plate-shaped material into a first region having a predetermined shape and a second region having the outer periphery of the first region as an inner periphery, the plate-shaped material is formed into a predetermined shape using a convex tool and a concave tool. A punching device for punching into
A cutting tool for cutting with a cutting line dividing the second region into two or more areas;
The ratio of the tool tip radius of the convex tool to the tool tip radius of the concave tool in each of the two adjacent areas with respect to the inner circumference of the second region corresponding to each area divided by the cutting tool. The convex tool and the concave tool having different relationships;
A plate material punching device characterized by comprising:   9. The punching device for plate-like material according to claim 8, wherein a tool tip radius of the convex tool is larger than a tool tip radius of the concave tool in a predetermined area of the two or more areas.   10. The plate-like material punching device according to claim 8, wherein the cutting tool is supported by an elastic structure.

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