JP2005103624A - Punch for press die, and guide structure and chamfering method in stripper plate of punch for press die - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a punch for a press die capable of drilling a workpiece and chamfering the outer edge of the opening part of a hole formed in the workpiece with small man-hours, and preventing burrs protruded inside the hole from forming in the workpiece during the chamfering work, and to provide a guide structure and a chamfering method in a stripper plate of the punch for the press die. <P>SOLUTION: In a punch 1 for the press die having a blade tip part 2 to punch a workpiece to open a hole in the workpiece, and a shank 3 which is continuous to the blade tip part 2 and is larger in diameter than the blade tip part 2, a chamfering unit 5 which is pressed against and brought into contact with the outer edge of an opening part on the punch-starting side of the hole opened in the workpiece to chamfer the outer edge is provided on the stepped portion of a boundary part between the blade tip part 2 and the shank 3. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a punch for a press die for making a hole in a work material, a guide structure in a stripper plate of a punch for a press die, and a chamfering of an outer edge of an opening portion of a hole made in the work material. Relates to the chamfering method.

  2. Description of the Related Art Conventionally, there is known a punch for a press die having a blade edge portion for punching a workpiece material to form a hole in the workpiece material and a shank having a larger diameter than the blade edge portion. (For example, refer to Patent Document 1).

  The outer edge of the opening of the hole opened in the workpiece by the punch for the press die is in a state of being cornered, and such an edge of the outer edge inserts a connector or the like into the hole, for example. Chamfering may be performed in consideration of ease of insertion.

  Such chamfering is performed, for example, as shown in FIG. In other words, reference numeral 40 denotes a workpiece, and a hole 41 having a circular shape in plan view is formed in the workpiece 40 by a punch for a press die (not shown). Reference numeral 42 denotes a substantially cylindrical chamfering jig. A tip 43 of the chamfering jig 42 has a conical shape, and a tapered surface 44 is formed.

  The chamfering of the outer edge 45 of the opening portion of the hole 41 using the chamfering jig 42 is performed as follows. First, the tip portion 43 of the chamfering jig 41 is placed in the hole 41, and the tapered surface 44 is brought into contact with the outer edge 45. Then, the outer edge 45 is chamfered by hitting the rear end portion of the chamfering jig 42 with a hammer or the like and pressing the tapered surface 44 against the outer edge 45. Normally, the outer edge 45 is chamfered only on one side.

In addition to the chamfering method shown in FIG. 16, chamfering may be performed by shaving the outer edge of the opening of the hole formed in the workpiece with a drill.
Japanese Patent Laid-Open No. 10-249450 (5th page, FIGS. 4 to 6)

  However, in any of the above cases, there is a problem that the number of processes increases because a process for chamfering is performed separately in addition to the process of drilling holes in the workpiece.

  Further, when chamfering is performed using the chamfering jig, a burr protruding toward the inside of the hole opened in the workpiece is generated. If this burr is left as it is, it becomes a hindrance when a connector or the like is inserted into the hole, so it must be removed by shaving or the like, which is complicated.

  The object of the present invention is to enable the drilling of the workpiece and the chamfering of the outer edge of the opening of the hole formed in the workpiece with a small number of man-hours, and to open the workpiece in the chamfering. It is an object of the present invention to provide a punch for a press die, a guide structure in a stripper plate of a punch for a press die, and a chamfering method that can prevent a burr projecting into the formed hole.

  In order to achieve the above object, a punch for a press die according to the invention described in claim 1 includes a cutting edge portion for punching a workpiece and forming a hole in the workpiece, and a coupling to the cutting edge portion. In a punch for a press die having a shank having a diameter larger than that of the blade edge portion, an opening on the punching start side of a hole formed in a workpiece at a step portion at a boundary portion between the blade edge portion and the shank A chamfered portion for chamfering the outer edge is formed by pressing and contacting the outer edge of the workpiece when the workpiece is punched.

  A punch for a press die according to a second aspect of the present invention is characterized in that the chamfered portion is formed with a tapered surface.

  A guide structure in a stripper plate of a punch for a press die according to a third aspect of the present invention is formed by coupling a cutting edge portion for punching out a work material and forming a hole in the work material, and the cutting edge portion. A guide structure in a stripper plate of a punch for a press mold having a shank having a diameter larger than that of a blade edge portion, and a hole formed in a workpiece at a step portion at a boundary portion between the blade edge portion and the shank. The stripper plate has an outer surface of the shank of a punch for a press die in which a chamfered portion for chamfering the outer edge is formed by pressing and contacting the outer edge of the opening on the punching start side when the workpiece is punched. The guide hole is guided.

  According to a fourth aspect of the present invention, there is provided a chamfering method comprising: a cutting edge portion for punching a workpiece and opening a hole in the workpiece; and a shank coupled to the cutting edge portion and having a larger diameter than the cutting edge portion. A chamfering method for chamfering an outer edge of an opening portion of a hole opened in a workpiece by a punch for a press die having a workpiece at a step portion at a boundary portion between the blade edge portion and the shank. In the cutting edge portion of the punch for a press die, a chamfering portion for chamfering the outer edge is formed by pressing and contacting the outer edge of the opening on the punching start side of the hole formed in the punching hole when chamfering the outer edge. After punching the workpiece, the cutting edge is further inserted into the hole opened by punching the workpiece, and the chamfered portion is pressed against the outer edge of the opening on the punching start side of the hole opened in the workpiece. It is made to contact.

  According to the first aspect of the present invention, a workpiece is punched out by the blade edge portion, a hole is formed in the workpiece material, the blade edge portion is further penetrated into the hole, and the chamfered portion is formed in the workpiece. Chamfering is performed by pressing and contacting the outer edge of the opening on the punching start side of the material hole. Thereby, the chamfering of the outer edge of the opening of the hole can be performed at the time of punching the workpiece (in the process of punching the workpiece and opening the hole), and the drilling of the workpiece can be performed with less man-hours. Chamfering can be performed.

  Further, since the chamfered portion is pressed against the outer edge and the chamfering is performed in a state where the cutting edge portion is in the hole opened in the workpiece, it is possible to prevent the occurrence of a burr protruding toward the inside of the hole. Can do.

  According to the second aspect of the present invention, chamfering can be performed by pressing and contacting the chamfered portion formed of a tapered surface with the outer edge of the opening on the punching start side of the hole of the workpiece.

  According to this invention of Claim 3, after pressing the workpiece material on the die plate which comprises the lower mold | type of a press metal mold | die with the said stripper plate, the outer surface of the said shank of the punch for said press metal mold | die is carried out. The punch for the press die is lowered while being guided by the guide hole of the stripper plate, and the workpiece is punched out by the blade edge portion. This opens a hole in the workpiece. Then, the blade edge portion is further penetrated into the hole, and the chamfered portion is pressed into contact with the outer edge of the opening portion on the punching start side of the hole of the workpiece to perform chamfering. At this time, since the outer surface of the shank of the punch for the press mold is guided by the guide hole of the stripper plate, the chamfered portion at the boundary portion between the blade edge portion and the shank is opened in the workpiece. It is possible to contact the outer edge of the opening on the punching start side of the hole.

  As described above, the outer edge of the opening of the hole can be chamfered during the punching of the workpiece (in the process of punching the workpiece to make the hole), and the drilling of the workpiece and the chamfering can be performed with less man-hours. And can be done. Further, since the chamfered portion is pressed against the outer edge while the cutting edge portion is in the hole formed in the workpiece, chamfering is performed, so that no burr protruding toward the inside of the hole is generated.

  According to the fourth aspect of the present invention, it is possible to chamfer the outer edge of the opening of the hole at the time of punching the workpiece (in the process of punching the workpiece and opening the hole), with less man-hours. The workpiece can be drilled and the chamfered, and the chamfered portion is pressed against the outer edge while the cutting edge is in the hole drilled in the workpiece. Therefore, no burr protruding toward the inside of the hole occurs.

DESCRIPTION OF EMBODIMENTS Embodiments of a punch for a press die, a guide structure in a stripper plate of a punch for a press die, and a chamfering method according to the present invention will be described below with reference to the drawings.
FIG. 1 is a perspective view showing a first example of an embodiment of a punch for a press die according to the present invention, FIG. 2 is a front view of FIG. 1, and FIG. 3 is a cover by a punch for a press die shown in FIG. FIG. 4 is a diagram showing a state before punching a workpiece and making a hole, FIG. 4 is a diagram showing a state in which a workpiece is punched from the state shown in FIG. 3, and FIG. 5 is a workpiece from the state shown in FIG. It is a figure which shows the state which chamfered the outer edge of the opening part by the side of the punching start of the hole opened in the material.

  In the figure, reference numeral 1 denotes a punch for a press die, and this punch 1 for a press die is more than a cutting edge portion 2 and a cutting edge portion 2 for punching a workpiece and opening a hole in the workpiece. A large-diameter shank 3 and a flange portion 4 larger in diameter than the shank 3 are coupled in this order. And all of the said blade edge | tip part 2, the said shank 3, and the said collar part 4 are circular in cross-sectional shape.

  A chamfered portion 5 is formed at a step portion at a boundary portion between the blade edge portion 2 and the shank 3. The chamfered portion 5 presses and contacts the outer edge (see FIGS. 4 and 5) of the opening on the punching start side of the hole opened in the workpiece by the blade edge portion 2 when the workpiece is punched to chamfer the outer edge. Is to do. The chamfered portion 5 is formed as a tapered surface, and is formed such that an angle θ formed by an extension line of the tapered surface of the chamfered portion 5 and the outer surface 6 of the shank 3 is 45 degrees.

  Note that θ does not need to be 45 degrees, and may be an angle smaller than this (25 degrees in FIG. 6) as shown in FIG. 6, or 45 degrees as shown in FIG. The angle may be larger than that (in FIG. 7, it is 60 degrees). That is, θ is an angle smaller than 90 degrees, and any angle can be used as long as it can be chamfered by pressing and contacting the outer edge of the opening on the punching start side of the hole formed in the workpiece. Can be set to angle.

  Next, punching of the workpiece using such a punch 1 for a press die and chamfering of the outer edge of the opening of the hole opened by punching of the workpiece will be described with reference to FIGS. I will explain. In addition, the guide structure in the stripper plate of the punch 1 for press dies is also described.

  In the figure, reference numeral 7 denotes a punch plate, and a punch 1 for a press die is fixed to the punch plate 7 by inserting a shank 3 into a through hole 8 provided in the punch plate 7. The punch plate 7 is fixed to a punch holder (not shown) via a backing plate (not shown).

  Reference numeral 9 denotes a stripper plate fixed to the punch holder (not shown). The stripper plate 9 is provided with a guide hole 10 for guiding the punch 1 for a press die. The guide hole 10 is formed in a circular shape having a diameter substantially the same as the diameter of the shank 3 of the punch 1 for the press die, and the shank 3 is slidable. The outer surface 6 of the shank 3 of the punch 1 is guided. Thus, the guide of the punch 1 for the press die in the stripper plate 9 is not performed by the cutting edge portion 2 which is generally performed conventionally (see Japanese Patent Laid-Open No. 11-226800, FIG. 1), but the shank. The reason for performing the outer surface 6 is that, as described later, a workpiece is punched out and a hole is formed, and when the chamfered portion 5 chamfers the outer edge of the opening portion of the hole, the chamfered portion 5 is opened. This is because it can be brought into contact with the outer edge of the portion (see FIG. 5). Thus, since the punch 1 for the press die is guided by the guide hole 10 of the stripper plate 9 on the outer surface of the shank 3, the blade edge portion 2 is a guide for guiding it to the guide hole 10 of the stripper plate 9. It is only necessary to have a length necessary for punching out the workpiece because the portion is unnecessary.

  Reference numeral 11 denotes a die plate constituting a lower die of the press die, and a workpiece 12 is set on the die plate 11.

  The workpiece 12 is punched out with the punch 1 for a press die set in the press die in the above state to open a hole (reference numeral 13 in FIGS. 4 and 5), and the outer edge of the hole (reference numeral 13) To chamfer (reference numeral 14 in FIGS. 4 and 5), first, from a state shown in FIG. 3, a punch holder (not shown) is lowered to lower both the punch plate 7 and the stripper plate 9 together. When the stripper plate 9 abuts against the workpiece 12 and presses it, only the punch plate 7 is lowered, and the punch 1 for the press die fixed to the punch plate 7 is moved on the outer surface 6 of the shank 3. Guided by the guide hole 10 of the stripper plate 9 and descends, the workpiece 12 is punched out by the cutting edge 2 (FIG. 4). This opens the hole 13.

  Then, after punching the workpiece 12 in this way, the cutting edge portion 2 is further penetrated into the hole 13 and the chamfered portion 5 is pressed into contact with the outer edge 14 of the opening on the punching start side of the hole 13 to perform chamfering ( FIG. 5).

  At this time, since the guide of the punch 1 for the press die in the stripper plate 9 is performed on the outer surface 6 of the shank 3, the chamfered portion 5 at the boundary portion between the blade edge portion 2 and the shank 3 is formed on the punching start side of the hole 13. Can be brought into contact with the outer edge 14 of the opening.

  As described above, the outer edge 14 of the opening portion of the hole 13 can be chamfered when the workpiece 12 is punched, that is, in the process of punching the workpiece 12 and opening the hole 13, and with a small number of man-hours. Drilling of the workpiece 12 and the chamfering can be performed. Further, since the chamfered portion 5 is pressed against the outer edge 14 in a state where the blade edge portion 2 is in the hole 13 formed in the workpiece 12, chamfering is performed, and thus a burr protruding toward the inside of the hole 13 is generated. Absent.

  Next, a second example of the embodiment of the present invention will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected and shown to the element same as the 1st example of the said embodiment.

  In the punch 20 for the press die of this example, the cross-sectional shape of the shank 3 and the flange portion 4 is circular, but the cross-sectional shape (end surface shape) of the blade edge portion 2 is rectangular and has an irregular shape. It has become.

  In this example, the chamfered portions are indicated by reference numerals 5a, 5b, 5c, and 5d, and the outer edges (from the four sides) of the opening portion of the rectangular hole in plan view opened in the workpiece by the blade edge portion 2. In order to be able to make a press contact, it is divided into four parts corresponding to the four side surfaces 2a, 2b, 2c, 2d of the blade edge part 2, and becomes a substantially hooves-shaped tapered surface. Yes.

  The guide structure in the stripper plate of the punch 20 for the press mold of this example, the workpiece was punched by using the punch 20 for the press mold of this example, and the punch was punched by the workpiece. The chamfering of the outer edge of the opening of the hole is the same as in the first example of the above embodiment, and the illustration of this example is omitted and the description thereof is omitted.

  According to the punch 20 for a press die of the present example as described above, when the workpiece is punched, the opening on the punching start side of the rectangular hole in plan view opened in the workpiece by the blade edge portion 2 is formed. The chamfered portions 5a, 5b, 5c, and 5d are pressed and brought into contact with each side of the outer edge, whereby the outer edge is chamfered, and the same effect as in the first example of the above embodiment can be obtained.

  Next, a third example of the embodiment of the present invention will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected and shown to the element same as the 1st example of the said embodiment.

  In the punch 30 for a press die of this example, the cross-sectional shape of the shank 3 and the flange portion 4 is circular, but the cross-sectional shape (end surface shape) of the blade edge portion 2 is substantially oval (partially) It has a straight part) and has an irregular shape.

  In this example, the chamfered portion 5 is a tapered surface that can be brought into press contact with the outer edge of the opening portion of a hole having a substantially oval shape in plan view (partially having a straight portion) opened in the workpiece by the cutting edge portion 2. It is formed with.

  The guide structure in the stripper plate of the punch 30 for the press die of this example, the punching of the workpiece using the punch 30 for the press die of this example, and the punching of the workpiece were opened. The chamfering of the outer edge of the opening of the hole is the same as in the first example of the above embodiment, and the illustration of this example is omitted and the description thereof is omitted.

  According to the punch 30 for a press die of the present example as described above, a plan view substantially oval shape (partially has a linear portion) opened in the workpiece by the blade edge portion 2 when the workpiece is punched. The chamfered portion 5 is pressed and brought into contact with the outer edge of the opening on the punching start side of the hole), and the same effect as in the first example of the above embodiment can be obtained.

  Note that a punch for a press die to which the present invention is applied includes a blade tip 2 for punching a workpiece and opening a hole in the workpiece, and a shank 3 and a shank 3 larger in diameter than the blade tip 2. However, it is not limited to one in which the large-diameter flange 4 is coupled in this order, and may be a punch for a press die that does not have a flange, for example.

The perspective view which shows the 1st example of embodiment of the punch for press dies which concerns on this invention. The front view of FIG. The figure which shows the state before punching out a workpiece with the punch for press dies shown in FIG. 1, and opening a hole. The figure which shows the state which punched the workpiece from the state shown in FIG. 3, and opened the hole. The figure which shows the state which carried out the chamfering of the outer edge of the opening part by the side of the punching start side of the hole opened in the workpiece from the state shown in FIG. The front view which shows the modification of the chamfering part in the punch for press dies shown in FIG. The front view which shows the modification of the chamfering part in the punch for press dies shown in FIG. The perspective view which shows the 2nd example of embodiment of the punch for press dies concerning this invention. The top view which looked at the punch for press dies shown in FIG. 8 from the bottom. The front view which shows a part of punch for press dies shown in FIG. The side view which shows a part of punch for press dies shown in FIG. The perspective view which shows the 3rd example of embodiment of the punch for press dies which concerns on this invention. The top view which looked at the punch for press dies shown in FIG. 12 from the bottom. The front view which shows a part of punch for press dies shown in FIG. The side view which shows a part of punch for press dies shown in FIG. Explanatory drawing of an example of the conventional chamfering.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Punch for press dies 2 Cutting edge part 3 Shank 4 Groove part 5 Chamfer part 6 Outer surface 7 Punch plate 8 Through-hole 9 Stripper plate 10 Guide hole 11 Die plate 12 Work material 13 Hole 14 Outer edge

Claims (4)

In a punch for a press die having a blade edge portion for punching a workpiece material and making a hole in the workpiece material, and a shank that is coupled to the blade edge portion and has a larger diameter than the blade edge portion,
In order to chamfer the outer edge by pressing and contacting the outer edge of the opening on the punching start side of the hole formed in the workpiece at the step portion at the boundary portion between the blade edge portion and the shank when the workpiece is punched A punch for a press die, characterized in that a chamfered portion is formed.   The punch for a press die according to claim 1, wherein the chamfered portion is formed by a tapered surface. Guide structure in a stripper plate of a punch for a press die having a blade edge portion for punching a workpiece material and making a hole in the workpiece material, and a shank having a diameter larger than that of the blade edge portion. Because
In order to chamfer the outer edge by pressing and contacting the outer edge of the opening on the punching start side of the hole formed in the workpiece at the step portion at the boundary portion between the blade edge portion and the shank when the workpiece is punched A guide structure in a stripper plate for a punch for a press die, wherein the outer surface of the shank of the punch for a press die having a chamfered portion is guided in a guide hole provided in the stripper plate. The workpiece is punched by a punch for a press die having a cutting edge portion for punching the workpiece and opening a hole in the workpiece, and a shank having a diameter larger than that of the cutting edge portion. A chamfering method for chamfering an outer edge of an opening of a formed hole,
In order to chamfer the outer edge by pressing and contacting the outer edge of the opening on the punching start side of the hole formed in the workpiece at the step portion at the boundary portion between the blade edge portion and the shank when the workpiece is punched After punching the workpiece with the cutting edge portion of the punch for the press mold in which the chamfered portion is formed, the blade edge portion is further penetrated into a hole opened by punching the workpiece, and the chamfered portion is A chamfering method comprising pressing and contacting an outer edge of an opening on a punching start side of a hole formed in a workpiece.

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