JP2009233828A - Punching pin, punching die, and punching device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a punching pin, a punching die, and a punching device, capable of more completely preventing the formation of burrs without making a difference in punching work state in the front and back surfaces of a workpiece. <P>SOLUTION: A blade part 11 is provided at an axially distal end of a shaft portion 12, where an outside diameter D1 of maximum outer circumferential portions 101, 102 serving as blades is larger than an outside diameter D2 of the shaft portion 12. In a process of punching by driving the punching pin 1 into female punching dies 2, 3, the workpiece 4 is punched by the first maximum outer circumferential portion 101. In a process of drawing the punching pin 1 out of the female punching dies 2, 3, the second maximum outer circumferential portion 102 works as a blade to cut off machining residues 43 such as burrs when moving from the back side to the front side. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention mainly relates to a punching pin, a punching die, and a punching device suitable for punching a laminated sheet.

  For example, a ceramic electronic component may require a vertical conductor such as a through conductor or a non-through conductor because of its circuit configuration. In the case of forming such a vertical conductor, it is common to punch a sheet on which a green sheet layer, which is an unfired ceramic layer, is formed on a flexible film to form a hole for the vertical conductor.

  In the printed circuit board, an insulating layer made of a resin film, an adhesive layer made of an adhesive laminated on the insulating layer, and a release layer made of a release film laminated on the adhesive layer After the punching process is performed on the provided adhesive sheet, the release layer may be peeled off from the adhesive layer, and the adhesive layer may be adhered to the conductor pattern. For the above-described punching, a punching die having an upper blade made of a movable blade and a lower blade made of a fixed blade is used.

  However, when the upper blade is moved relative to the lower blade so as to penetrate the sheet, the sheet is subjected to shear stress and is stretched in the moving direction together with the moving upper blade due to its viscosity. It becomes a burr on the surface. If such a burr | flash remains, it will produce a bad effect on a characteristic or practical use in a ceramic electronic component or a printed circuit board.

  As a method for preventing the generation of burrs, for example, a cutting blade is provided at the leading edge of the cutting punch, and the adhesive is separated by the cutting blade at the time of punching to prevent the generation of burrs. Has been proposed (see, for example, Patent Document 1).

  However, the above proposal requires a special configuration such as projecting a cutting blade on the cutting punch, resulting in an increase in cost. Further, even the cutting blade is still slightly stretched in the moving direction of the moving cutting blade, and is insufficient to effectively prevent the generation of burrs.

  As means for solving the above-mentioned burr problem, Patent Document 2 uses a punching die in which the cutting edge of the lower blade is duller than the cutting edge of the upper blade. A method of forming a through hole in an adhesive sheet by placing an adhesive sheet in which an agent layer and a release layer are sequentially laminated and advancing a lower blade that is a movable blade is disclosed.

  According to this method, it is said that through holes can be formed in the adhesive sheet while reliably preventing the occurrence of burrs in the adhesive layer.

However, since the technique described in Patent Document 2 is a one-way punching method that punches when the lower blade is advanced, there is a difference in the punching state on the front surface and the back surface of the laminated sheet. When the front and back surfaces of the laminated sheet are made of different materials, a large difference is likely to occur in the punched state of the front and back surfaces. For this reason, it cannot be punched into a complete state where no burr is present. In particular, in the punching process of a laminated sheet provided with a ceramic green sheet layer on a flexible film such as a PET film, burrs are likely to occur when the flexible film is punched. There is no means to deal with.
Japanese Patent Laid-Open No. 5-200448 JP 2006-26884 A

  An object of the present invention is to provide a punching pin, a punching die, and a punching device that can completely prevent the occurrence of burrs without causing a difference in the punching state on the front surface and the back surface of the workpiece.

Another object of the present invention is to provide a punching pin, a punching die, and a punching device that can separate a processing residue such as a removed burr from a workpiece.

  In order to solve the above-described problem, the punching pin according to the present invention includes a blade portion and a shaft portion. The blade portion is provided at a tip portion in the axial direction of the shaft portion, and an outer diameter of a maximum outer diameter portion serving as a blade is larger than an outer diameter of the shaft portion.

  The punching pin according to the present invention is used to constitute a male punching die. The male punching die thus obtained is combined with the female punching die to constitute a punching device. Of course, the female punching die is compatible with the male punching die.

  In the punching apparatus described above, for example, in order to punch a workpiece such as a laminated sheet, a sheet-like member is placed in a female punching die, and the male punching die is allowed to enter the female punching die. Punch out, then retract, and pull out from the female punching die.

  Here, the punching pin used in the male punching die is larger than the outer diameter of the shaft portion, so that the male punching die is moved beyond the blade portion. In the step of punching into the female punching mold up to the shaft portion, the workpiece is punched by the punching force from the front surface side to the back surface side by the maximum outer diameter portion serving as a blade. In this punching process, it is difficult to realize complete punching without causing burrs. In particular, burrs are likely to occur in laminated sheets having different states on the front side and the back side.

  In the present invention, the punching pin used in the male punching die has a larger outer diameter than that of the shaft portion. In the process of entering the female punching die to the shaft portion and then retreating to the shaft portion, and extracting it from the female punching die, the maximum outer diameter portion acts as a blade even when going from the back side to the front side, and remains Cut any burrs.

  Therefore, according to the present invention, it is possible to completely prevent the occurrence of burrs without causing a difference in the punching state on the front surface and the back surface of the workpiece.

  Moreover, in the step of retracting the male punching die and extracting from the female punching die, the remaining burrs and the like are cut out and held by the male punching die, and the female punching die and the workpiece are processed. Since it can be taken out of the workpiece, it is possible to separate processing residues such as burrs from the workpiece and avoid problems caused by the processing residues adhering to the workpiece.

  As the punching pin, a pin having a shape in which the maximum outer diameter portion of the blade portion exists at the boundary with the shaft portion, that is, the rearmost end portion in the axial direction of the blade portion can be used. In the case of this shape, a step due to the difference between the outer diameters occurs at the boundary between the blade portion and the shaft portion, so in the process of extracting the male punching die from the female punching die, etc. Can be reliably cut off, and processing residues such as burrs that have been cut off can be reliably separated from the workpiece while being placed on the stepped portion. When the male punching die is inserted into the female punching die, the tip edge of the blade portion can function as a blade.

  As another form, the largest outer diameter part can also take the form which exists in the intermediate part of the axial direction of the said blade part. In the case of this embodiment, the maximum outer diameter portion can function as a blade in both cases of the male punching die entering and leaving the female punching die.

  Further, the blade portion of the punching pin may have a conical outer shape. In particular, a tapered conical shape is preferable. In this form, the misalignment of the male punching die with respect to the female punching die is corrected by the tapered cone shape of the blade portion with the progress of the punching process, thereby avoiding a bite breakage accident etc. Can do.

  In order to construct a punching die using the punching pin according to the present invention, a large number of punching pins are erected on the same surface of the support. In general, a large number of punching pins are arranged in a matrix on the same surface of the support. It is configured as a so-called “Sword Mountain” type. With this type of male punching die, punching efficiency can be remarkably improved.

  The female punching die constituting the punching device in combination with the male punching die described above includes an upper die and a lower die, and has a structure in which a workpiece is sandwiched between the upper die and the lower die. It is preferable to do. If it is such a structure, the edge which contacts the to-be-processed object can be utilized as a blade in the upper type | mold and lower type | mold which comprise a female type | mold punching type | mold.

  A specific example of the workpiece is a sheet-like member having a green sheet layer on the surface of the resin film. Such a workpiece has different materials on the front side and the back side and is likely to generate burrs. However, according to the present invention, there is a difference in the punching state on the front and back sides of the workpiece. Since it does not generate, even if it is a to-be-processed object from which a material differs by the surface side and a back surface side, generation | occurrence | production of a burr | flash can be prevented.

  As described above, according to the present invention, a punching pin, a punching die, and a punching apparatus that can more completely prevent the occurrence of burrs without causing a difference in the punching state on the front and back surfaces of the workpiece. Can be provided.

  Further, it is possible to provide a punching pin, a punching die, and a punching device that can separate a processing residue such as a removed burr from a workpiece.

  FIG. 1 is a diagram showing a usage state of a punching apparatus using a punching pin according to the present invention. Referring to the drawing, first, the punching pin 1 according to the present invention includes a blade portion 11 and a shaft portion 12. The blade portion 11 is provided at one end portion (tip portion) of the shaft portion 12 in the axial direction, and the outer diameter D1 of the maximum outer diameter portions 101 and 102 serving as the blade is larger than the outer diameter D2 of the shaft portion 12.

  In the illustrated punching pin 1, the blade portion 11 has a circular cross section having the same outer diameter D <b> 1 over the entire length in the axial direction, i.e., a cylinder shape, and the maximum outer diameter portions 101 and 102 have tip end edges in the axial direction. The first maximum outer diameter portion 101 generated at the rear end and the second maximum outer diameter portion 102 generated at the rear end edge. The second maximum outer diameter portion 102 is a rearmost edge located at the boundary between the blade portion 11 and the shaft portion 12, and a step due to the outer diameter difference G1 between the blade portion 11 and the shaft portion 12 is provided. Occurs. Both the first maximum outer diameter portion 101 and the second maximum outer diameter portion 102 function as a blade.

  The cross-sectional shape of the blade portion 11 is determined by the required shape of the hole, and is not limited to a circular cross-section. Of the punching pin 1, the blade portion 11 is made of a cemented carbide generally used in this type of mold. The shaft portion 12 does not necessarily need to be made of a cemented carbide because of its function. However, if integration with the blade portion 11 is desirable for manufacturing processing, the shaft portion 12 is made of the same cemented carbide as the blade portion 11. The

  The punching pin 1 according to the present invention is combined with a support 13 to constitute a punching die. The punching die thus obtained is used as a male die and is combined with the female punching die 2 and 3 to constitute a punching device. As a matter of course, the female punching molds 2 and 3 are suitable for the male punching mold.

In the embodiment, the female punching dies 2 and 3 include an upper die 2 and a lower die 3, and have a structure in which a workpiece 4 is sandwiched between the upper die 2 and the lower die 3. The upper die 2 has a hole blade 22 opened in the base body 21 immediately below the punching pin 1, and the lower mold 3 is completely in contact with the hole blade 22 of the upper mold 2 with respect to the base body 31. It has a hole-like blade 32 opened so as to overlap.
The hole 2 of the upper die 2 has the inner peripheral edge 220 on the lower surface side functioning as a blade, and the hole-shaped blade 32 of the lower die 3 has the inner peripheral edge 320 on the upper surface side functioning as a blade. The upper mold 2 and the lower mold 3 are made of a cemented carbide generally used in the mold.

  The workpiece 4 is a sheet-like member having a green sheet layer 42 on the surface of a resin film 41 made of, for example, PET. Such sheet-like members are frequently used in the manufacturing process of ceramic electronic components.

  Next, the punching process by the punching apparatus shown in FIG. 1 will be described with reference to FIGS. In the punching apparatus described above, for example, in order to punch a workpiece 4 such as a laminated sheet, the workpiece 4 is placed on the female punching dies 2 and 3 as shown in FIG. The punching pin 1 of the die punching die is entered and punched into the female punching die 2 and 3 as indicated by the arrow F1. In the case of the present embodiment, since the female punching dies 2 and 3 are composed of the upper die 2 and the lower die 3, the workpiece 4 is pressed between the upper die 2 and the lower die 3. Fixed and punched in this state.

  In the punched state, as shown in FIG. 3, the punching pin 1 is advanced to a position where the shaft portion 12 penetrates the lower mold 3. Thereby, the punched piece 40 is completely punched from the workpiece 4 and falls off.

  Here, the punching pin 1 used in the male punching die is a male die because the outer diameter D2 of the first maximum outer diameter portion 101 on the tip edge side serving as the blade is larger than the outer diameter D1 of the shaft portion 12. In the step of punching the punching pin 1 for punching into the female punching dies 2 and 3, the workpiece 4 is punched from the front side toward the back side by the first maximum outer diameter portion 101 serving as a blade. Punched by power. In this punching process, it is difficult to realize complete punching without generating burrs. In particular, processing residues 43 such as burrs are likely to occur in laminated sheets that are in different states on the front and back sides.

  Next, as shown in FIG. 4, the punching pin 1 of the male punching die is retracted in the direction indicated by the arrow R1. In the step of extracting the punching pin 1 from the female punching dies 2 and 3, the outer diameter D1 of the second maximum outer diameter portion 102 serving as the blade is larger than the outer diameter D2 of the shaft portion 12. 2 The maximum outer diameter portion 102 functions as a blade when moving from the back surface side to the front surface side, and cuts the remaining processing residue 43 such as burrs as shown in FIG.

  Therefore, according to the present invention, it is possible to more completely prevent the occurrence of burrs without causing a difference in the punching state on the front surface and the back surface of the workpiece 4.

  Moreover, in the step of retracting the male punching die and extracting from the female punching die 2, 3, the remaining processing residue 43 such as burrs is cut out and taken out while being held by the male punching die. Therefore, it is possible to separate the processing residue 43 such as burrs from the workpiece 4 and avoid problems caused by the processing residue 43 such as burrs adhering to the workpiece 4.

  In the embodiment using the punching pin 1 having a shape in which the second maximum outer diameter portion 102 of the blade portion 11 exists at the boundary with the shaft portion 12, that is, the rearmost end portion in the axial direction of the blade portion 11. In the step of extracting the punching pin 1 of the male punching die from the female punching dies 2 and 3 because a step is caused at the boundary between the blade portion 11 and the shaft portion 12 due to the difference G1 between the outer diameters. The remaining processing residue 43 such as burrs is reliably cut out, and the removed processing residue 43 such as burrs is placed on the stepped portion, and then the female punching dies 2 and 3 and the outside of the workpiece 4 are removed. And can be reliably separated from the workpiece 4.

  Thereafter, as shown in FIG. 6, the upper die 2 is pulled up in the direction indicated by the arrow R1, the workpiece 4 is brought into a free state from the upper die 2, and is moved by a predetermined distance in the direction indicated by the arrow F2. . Then, the upper die 2 is moved in the reverse direction (F1 direction) to return to the state shown in FIG. 2, and the same punching process is repeated. Conventionally known techniques can be used for the driving method of the male punching die and the female punching die 2 and 3, the synchronous driving method of the punching die 2 and the workpiece 4 and the like.

  The punching pin 1 according to the present invention can take various forms. An example is shown in FIGS. 7 (a) to 7 (d). First, in the embodiment of FIG. 7A, the blade part 11 includes a plurality of blade parts 111 to 113. Each of the blade parts 111 to 113 is arranged at intervals in the axial direction, is connected to each other by shaft parts 121 and 122, and is further coupled to the support 13 by the shaft part 123. Each space | interval of the blade parts 111-113 is larger than the thickness of a workpiece. Thereby, each of the blade parts 111 to 113 can function as an individual punching blade, and an advanced punching result obtained by accumulating the results can be obtained.

  Next, in the embodiment of FIG. 7B, the blade portion 11 of the punching pin 1 has a conical portion 114 at the tip portion. A cylindrical portion 115 having the same cross-sectional shape is provided on the rear side of the conical portion 114. The boundary between the conical portion 114 and the cylindrical portion 115 forms the first maximum outer diameter portion 101, and the boundary between the cylindrical portion 115 and the shaft portion 123 forms the second maximum outer diameter portion 102. The diameter portion 101 and the second maximum outer diameter portion 102 function as a blade. According to this embodiment, the positional deviation of the punching pin 1 with respect to the female punching dies 2 and 3 is easily corrected by the tapered cone shape of the blade portion 11 as the punching process proceeds, and the die bite breakage Accidents can be avoided.

  In the embodiment of FIG. 7C, the blade portion 11 has a conical shape whose rear end edge is the maximum outer diameter portion 103. The maximum outer diameter portion 103 functions as a blade in both cases of entering and leaving the female punching dies 2 and 3.

  Further, in the embodiment of FIG. 7D, the blade portion 11 has a maximum outer diameter portion 103 at an intermediate portion in the axial length. Specifically, with respect to the maximum outer diameter portion 103, the front end side and the rear end side are conical. In the case of this form, the maximum outer diameter portion 103 can be caused to function as a blade in both cases of the male punching die 2 and 3 entering and leaving the female punching die 2 and 3. Although illustration is omitted, selective and arbitrary combinations of FIGS. 7A to 7D are possible.

  FIG. 8 is a front view showing a specific example of a punching die (male type) using the punching pin 1 according to the present invention, and FIG. 9 is a bottom view of the punching die shown in FIG. As shown in the drawing, in order to form a punching die using the punching pin 1 according to the present invention, a large number (n × m) of punching pins 101 to 10 nm are erected on the same surface of the support 13. . In general, a large number (n × m) of punching pins 101 to 10 nm can be arranged in a matrix on the same surface of the support 13. It is configured as a male punching die having a so-called “Kenyama” type structure. With this type of male punching die, punching efficiency can be remarkably improved. 8 and 9, the punching pins shown in FIGS. 1 to 6 are used. However, the punching pins shown in FIGS. 7A to 7D are selectively and arbitrarily used. Can do.

  Although the contents of the present invention have been specifically described above with reference to the preferred embodiments, it is obvious that those skilled in the art can take various modifications based on the basic technical idea and teachings of the present invention. It is.

It is a figure which shows the use condition of the punching apparatus using the punching pin which concerns on this invention. It is a figure which shows the punching process by the punching apparatus shown in FIG. It is a figure which shows the punching process after the punching process shown in FIG. It is a figure which shows the punching process after the punching process shown in FIG. It is a figure which shows the punching process after the punching process shown in FIG. It is a figure which shows the punching process after the punching process shown in FIG. It is a figure which shows the various forms of the punching pin which concerns on this invention. It is a front view which shows the specific example of the type | mold for punching (male type | mold) using the punching pin 1 which concerns on this invention. FIG. 9 is a bottom view of the punching mold shown in FIG. 8.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Punching pin 11 Blade part 12 Shaft part 101 1st largest outer diameter part 102 2nd largest outer diameter part 2 Upper mold | type 3 Lower mold | type

Claims (10)

A punching pin including a blade portion and a shaft portion,
The blade portion is provided on one end side in the axial direction of the shaft portion, and the outer diameter of the maximum outer diameter portion serving as the blade is larger than the outer diameter of the shaft portion.
Punching pin.   The punching pin according to claim 1, wherein the maximum outer diameter portion is present at a boundary with the shaft portion. The punching pin according to claim 1,
The blade portion has a circular cross section having the same outer diameter over the entire length in the axial direction,
The maximum outer diameter portion is composed of a first maximum outer diameter portion generated at the front end edge in the axial direction and a second maximum outer diameter portion generated at the rear end edge.
Punching pin.   2. The punching pin according to claim 1, wherein there are a plurality of blade portions, each of which is arranged at intervals in the axial direction.   2. The punching pin according to claim 1, wherein the maximum outer diameter portion exists in an intermediate portion in an axial direction.   The punching pin according to claim 1, wherein the blade portion has a conical portion at a tip portion. A punching die including a support and a plurality of punching pins,
The punching pin is described in any one of claims 1 to 6, and is erected on the same surface of the support.
Punching mold. A punching device including a male punching die and a female punching die,
The male punching die is the one described in claim 7,
The female punching die is compatible with the male punching die,
Punching device.   9. The punching apparatus according to claim 8, wherein the female punching die includes an upper die and a lower die, and a workpiece is sandwiched between the upper die and the lower die. . The punching apparatus according to claim 9, wherein the workpiece is a sheet-like member having a green sheet layer on a surface of a resin film.

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