JP2021142535A - Punch die - Google Patents

Abstract

To provide a punch die that can suppress cost for replacing a blade tip part.SOLUTION: A punch die includes a blade tip part and a holder for holding the blade tip part. The holder includes: an upper-side part on one side in a direction in which the blade tip part extends; and a lower-side part on the other side. An end on the other side of the blade tip part comes into contact with an end on one side of the lower-side part. The upper-side part includes a first flange part that is caught by the lower-side part from the other side. The blade tip part includes a second flange part that is caught by the upper-side part from the other side.SELECTED DRAWING: Figure 1

Description

The present invention relates to a punch die.

Conventionally, in the case of manufacturing a punch die for punching a shape (total punching) in a press die, for example, a method of manufacturing an integrated punch die using a profile grinder has been adopted. When manufacturing an integrated punch die, the processing cost increases. When wire-cut electric discharge machining (hereinafter referred to as wire machining) is used to facilitate machining, machining of flat surfaces is easy, but stepped punch dies with different widths in the axial direction should be manufactured. It is difficult.

Therefore, a method of fixing a plurality of members manufactured by wire processing with Loctite is also adopted. However, in the method of fixing with Loctite, in the case of a product having a strong tensile load, Loctite comes off, which makes mass productivity difficult. The punch die needs to be replaced when the cutting edge is worn during mass production, but it is difficult to replace the cutting edge by the method of fixing with Loctite.

Patent Document 1 describes a punch mold in which a locking portion that cannot be engaged and disengaged in the axial direction and that can be engaged and disengaged in a direction orthogonal to the axial direction is formed at the lower end portion of the punch body and the upper end portion of the punch tip. Is disclosed. In the punch die disclosed in Patent Document 1, the punch body and the punch tip do not separate during press working in the axial direction, and can be replaced by separating the punch tip having the cutting edge portion in a direction orthogonal to the axial direction. It has become.

Jikkenhei 4-090127

However, in the punch die disclosed in Patent Document 1, the shape of the punch tip to be replaced is complicated and the manufacturing cost increases. Since the shape of the punch tip is complicated and there are places other than the cutting edge where stress is likely to concentrate and where the cross-sectional area is small, there is a concern that the connection part with the punch body may be damaged, resulting in an increase in replacement cost. Problems arise.

The present invention has been made in consideration of the above points, and an object of the present invention is to provide a punch die capable of suppressing the replacement cost of the cutting edge portion.

According to the first aspect of the present invention, a cutting edge portion and a holder for holding the cutting edge portion are provided, and the holder has an upper portion on one side in the direction in which the cutting edge portion extends and a lower portion on the other side. A second portion having a side portion, the other end portion of the cutting edge portion and the one side end portion of the lower side portion are in contact with each other, and the upper portion portion is hooked on the lower side portion from the other side portion. A punch die having one flange portion and the cutting edge portion having a second flange portion hooked from the other side on the upper side portion is provided.

According to one aspect of the present invention, it is possible to provide a punch die capable of suppressing the replacement cost of the cutting edge portion.

FIG. 1 is a cross-sectional view of a part of a press die PR having the punch die 1 of the present embodiment as viewed from the front side. FIG. 2 is a plan view of the punch die 1 as viewed from above. FIG. 3 is a front view of the cutting edge portion 10 viewed in the thickness direction. FIG. 4 is a plan view of the cutting edge portion 10 as viewed from above. FIG. 5 is a cross-sectional view of the upper portion 30 as viewed in the thickness direction. FIG. 6 is a plan view of the upper portion 30 as viewed from above. FIG. 7 is a cross-sectional view of the lower portion 40 as viewed in the thickness direction. FIG. 8 is a plan view of the lower side portion 40 as viewed from above.

Hereinafter, the punch die according to the embodiment of the present invention will be described with reference to the drawings. The scope of the present invention is not limited to the following embodiments, and can be arbitrarily changed within the scope of the technical idea of the present invention. Further, in the following drawings, in order to make each configuration easy to understand, the scale and number of each structure may be different from the actual structure.

FIG. 1 is a cross-sectional view of a part of a press die PR having a punch die 1 as viewed from the front side. FIG. 2 is a plan view of the punch die 1 as viewed from one side (upper side in FIG. 1).
As shown in FIGS. 1 and 2, the press die PR has a punch die 1, a punch plate 100, and a backing plate 110.

The punch die 1 includes a cutting edge portion 10 and a holder 20. The punch die 1 has a square columnar shape along the direction in which the cutting edge portion 10 extends (vertical direction in FIG. 1). In the following description, the extending direction of the cutting edge portion 10 is the vertical direction, one side (upper side in FIG. 1) is the upper side, and the other side opposite to one side (lower side in FIG. 1) is the lower side. This will be described as appropriate. Further, a direction orthogonal to the vertical direction and parallel to the paper surface in FIG. 1 will be referred to as a width direction, and a direction perpendicular to the paper surface in FIG. 1 will be appropriately described as a thickness direction. However, this defines the vertical direction only for convenience of explanation, and does not limit the installation posture when the punch die of the present invention is mounted on an actual press die PR.

FIG. 3 is a front view of the cutting edge portion 10 as viewed in the thickness direction. FIG. 4 is a plan view of the cutting edge portion 10 as viewed from above. As shown in FIGS. 3 and 4, the cutting edge portion 10 has a cutting edge portion main body 11, a second flange portion 12, and an end surface 10a. The cutting edge portion main body 11 has a rectangular columnar shape having a rectangular cross-sectional shape in a direction orthogonal to the vertical direction. Since the cross-sectional shape of the cutting edge portion main body 11 is prismatic, there are no places where stress is easily concentrated and places where the cross-sectional area is small, and damage when a press load is applied can be suppressed. The cross-sectional shape of the cutting edge portion main body 11 shown in the present embodiment is an example, and a polygon other than a rectangle, a circle, an ellipse, an oval shape, or the like can be arbitrarily selected depending on the product to be molded using the press die PR. It is possible.

The cross-sectional shape of the cutting edge portion main body 11 is the same in the vertical direction except for the portion where the second flange portion 12 is provided. By making the cross-sectional shape of the cutting edge portion main body 11 the same in the vertical direction, it is possible to select a manufacturing method that facilitates flat processing such as wire processing and polishing processing.

The second flange portion 12 has a square columnar shape. The second flange portion 12 is located at the lower end portion of the cutting edge portion main body 11. The vertical length of the second flange portion 12 is shorter than the vertical length of the cutting edge portion main body 11. The second flange portion 12 is located on one side in the width direction of the cutting edge portion main body 11 (left side in FIG. 3, hereinafter referred to as left side in the width direction). The second flange portion 12 is shorter than the thickness of the surface on the left side in the width direction of the cutting edge portion main body 11. The lower end portion of the second flange portion 12 and the lower end portion of the cutting edge portion main body 11 are flush with each other, and form the lower end surface 10a of the cutting edge portion 10.

The holder 20 has an upper portion 30 and a lower portion 40.
FIG. 5 is a cross-sectional view of the upper portion 30 as viewed in the thickness direction. FIG. 6 is a plan view of the upper portion 30 as viewed from above.
As shown in FIGS. 5 and 6, the upper portion 30 is a square columnar extending in the vertical direction. The maximum length of the upper portion 30 in the vertical direction is shorter than the maximum length of the cutting edge portion 10 in the vertical direction. The upper portion 30 has a hole portion 31, a recess 32, a recess 33, a recess 34, and a first flange portion 35.

The hole portion 31 penetrates the upper portion 30 in the vertical direction. The cross-sectional shape of the hole 31 is rectangular. The cutting edge portion main body 11 of the cutting edge portion 10 is inserted into the hole portion 31. The inner peripheral surface of the hole 31 is held in contact with the outer peripheral surface of the cutting edge main body 11. The upper portion 30 has an end face 30a at the lower end portion. The end face 30a has a recess 32.

The recess 32 is located on the left side in the width direction of the hole 31. The recess 32 has an oval shape when viewed from above. The depth of the recess 32 is the same as the vertical length of the second flange portion 12. As shown in FIG. 1, when the cutting edge portion main body 11 is inserted through the hole portion 31, the upper end surface of the second flange portion 12 is caught on the bottom surface of the recess 32. That is, the cutting edge portion 10 is hooked on the upper portion 30 of the second flange portion 12 from the lower side. When the second flange portion 12 is hooked on the bottom surface of the recess 32, the end surface 10a of the cutting edge portion 10 is flush with the end surface 30a of the upper portion 30. When caught on the bottom surface of the second flange portion 12 recess 32, the cutting edge portion main body 11 projects upward of the upper portion 30.

The upper portion 30 has a recess 33 and a recess 34. The recess 33 and the recess 34 are recessed from the side surface 30b on the right side in the width direction of the upper portion 30 to the left side in the width direction, respectively. The recess 33 and the recess 34 extend in the thickness direction. The recess 33 is located at the lower end of the upper portion 30. The recess 34 is located above the recess 33. The dent amount of the dent 34 is larger than the dent amount of the dent 33. On the lower side of the recess 34, a first flange portion 35 projecting to the right in the width direction from the bottom of the recess 34 is provided. The first flange portion 35 extends in the thickness direction.

FIG. 7 is a cross-sectional view of the lower portion 40 as viewed in the thickness direction. FIG. 8 is a plan view of the lower side portion 40 as viewed from above.
As shown in FIGS. 7 and 8, the lower portion 40 is a square columnar extending in the vertical direction. The lower side portion 40 has a recess 41, a recess 42, a third flange portion 43, and a screw hole 44.

The recess 41 and the recess 42 are recessed from the side surface 40a on the left side in the width direction to the right side in the width direction in the lower portion 40, respectively. The recess 41 and the recess 42 extend in the thickness direction. The recess 41 is located at the upper end of the lower portion 40. The recess 42 is located below the recess 41. The dent amount of the dent 42 is larger than the dent amount of the dent 41.

On the upper side of the recess 42, a third flange portion 43 projecting to the left in the width direction from the bottom of the recess 42 is provided. The third flange portion 43 extends in the thickness direction. The lower side portion 40 has an end surface 40b facing upward on the lower side of the recess 42. The screw hole 44 is provided on the lower end surface 40c of the lower side portion 40. The screw hole 44 extends in the vertical direction.

The amount of the recess 34 is the same as the maximum length in the width direction of the third flange portion 43. The amount of the recess 42 is the same as the maximum length in the width direction of the first flange portion 35. The vertical length of the recess 34 is the same as the vertical length of the third flange portion 43. The vertical length of the recess 42 is the same as the vertical length of the first flange portion 35.

Therefore, as shown in FIG. 1, when the first flange portion 35 is inserted into the recess 42 and the third flange portion 43 is inserted into the recess 34, the first collar portion 35 is on the lower side of the third collar portion 43. Get caught from. That is, the upper portion 30 is hooked on the lower portion 40 in the first flange portion 35 from the lower side. When the upper portion 30 is hooked on the lower portion 40 from the lower side, the upper portion 30 and the lower portion 40 are integrated as a holder 20 in the vertical direction and cannot be separated.

The upper portion 30 and the lower portion 40 have the same diameter when viewed in the vertical direction. The upper portion 30 and the lower portion 40 have the same width and the same thickness. As shown in FIG. 1, the upper side portion 30 and the lower side portion 40 have side surfaces that form a width extending flush with each other in the vertical direction. The upper side portion 30 and the lower side portion 40 have side surfaces that form a thickness extending flush with each other in the vertical direction. Since the upper portion 30 and the lower portion 40 have the same diameter when viewed in the vertical direction, both the upper portion 30 and the lower portion 40 can be held by one hole portion 101 of the punch plate 100.

The cutting edge portion 10, the upper portion 30, and the lower portion 40 are each made of a well-known mold material. The mold material is, for example, a steel material.

The punch plate 100 has a hole 101 that penetrates in the vertical direction. The punch die 1 penetrates through the hole 101. The inner peripheral surface of the hole 101 is held in contact with the outer peripheral surface of the punch die 1. The vertical length of the punch plate 100 is shorter than that of the punch die 1. A part of the upper side of the punch die 1 projects upward from the punch plate 100.

The upper surface of the backing plate 110 is in contact with the lower surface of the punch plate 100 and the lower surface of the punch die 1 (end surface 40c of the lower side portion 40). The punch die 1 (lower side 40) can be fixed to the backing plate 110 by screwing a mounting screw (not shown) into the screw hole 44 from the lower surface side of the backing plate 110.

When assembling the punch die 1, first, the cutting edge portion main body 11 of the cutting edge portion 10 is inserted through the hole portion 31 of the upper portion 30 from the lower side, and the upper end surface of the second flange portion 12 is recessed 32. Hook on the bottom. As a result, the cutting edge portion 10 and the upper portion 30 are integrated.

Next, the upper portion 30 integrated with the cutting edge portion 10 and the lower side portion 40 are brought close to each other in the width direction, the first flange portion 35 is inserted into the recess 42, and the third flange portion 43 is inserted into the recess 34. do. Since the first flange portion 35, the third flange portion 43, the recess 42, and the recess 34 extend in the thickness direction, the upper portion 30 and the lower portion 40 integrated with the cutting edge portion 10 have a thickness. It is also possible to insert the first flange portion 35 into the recess 42 and the third flange portion 43 into the recess 34 so as to approach each other in the direction.

As a result, the cutting edge portion 10, the upper portion 30, and the lower portion 40 are integrated. At this time, the lower end surface 10a of the cutting edge portion 10 and the lower end surface 30a of the upper portion 30 are in contact with the same surface (end surface 40b) of the lower side portion 40.

When the end surface 10a of the cutting edge portion 10 comes into contact with the end surface 40b, the cutting edge portion 10 cannot be separated from the upper portion 30. When the end surface 30a of the upper portion 30 comes into contact with the end surface 40b, the cutting edge portion 10 and the upper portion 30 cannot be separated from the lower portion 40. The cutting edge portion 10, the upper portion 30, and the lower portion 40 are integrated as a punch die 1.

Next, the integrated punch die 1 is inserted into the hole 101 of the punch plate 100 and held. For the punch die 1 inserted into the hole 101 in the punch plate 100, the punch die 1 can be fixed to the backing plate 110 by screwing the mounting screw into the screw hole 44 from the lower surface side of the backing plate 110.

When replacing the cutting edge portion 10 of the punch die 1 fixed to the backing plate 110, first, the mounting screw is removed from the screw hole 44 to release the fixing of the punch die 1 to the backing plate 110. Subsequently, the punch die 1 is taken out upward from the hole 101 of the punch plate 100.

When the punch die 1 is taken out from the punch plate 100, the upper portion 30 integrated with the cutting edge portion 10 is separated from the lower portion 40 in the width direction or the thickness direction, so that the upper portion 30 integrated with the cutting edge portion 10 is separated from the lower portion 40. Can be separated from. By pulling out the cutting edge portion 10 downward with respect to the separated upper portion 30, the cutting edge portion 10 can be taken out and replaced.

After that, as described above, the punch die 1 is assembled, and the punch die 1 inserted into the hole 101 of the punch plate 100 is fixed to the backing plate 110 with the mounting screw, so that the replacement of the cutting edge portion 10 is completed. ..

As described above, in the punch die 1 of the present embodiment, since the cutting edge portion 10 has a prismatic cutting edge portion main body 11 and a second flange portion 12, the cutting edge portion 10 can be easily machined and stressed. There are few places where it is easy to concentrate and where the cross-sectional area is small and the strength is low. Therefore, in the punch die 1 of the present embodiment, the replacement cost of the cutting edge portion 10 can be suppressed.

Further, in the punch die 1 of the present embodiment, an arbitrary shape can be easily manufactured by processing the cutting edge portion 10 in the region protruding from the upper portion 30 according to the shape to be molded. In the punch die 1 of the present embodiment, the upper portion 30 and the lower portion 40 can be attached and detached in either the width direction or the thickness direction, and workability can be improved.

Although the preferred embodiments according to the present invention have been described above with reference to the accompanying drawings, it goes without saying that the present invention is not limited to the above examples. The various shapes and combinations of the constituent members shown in the above-mentioned examples are examples, and can be variously changed based on design requirements and the like within a range that does not deviate from the gist of the present invention.

1 ... Punching die, 10 ... Cutting edge, 10a, 30a ... End face, 11 ... Cutting edge body, 12 ... Second flange, 20 ... Holder, 30 ... Upper part, 31 ... Hole, 34 ... Indentation, 35 ... 1st collar, 40 ... lower side, 40b ... end face (same surface), 43 ... 3rd collar, 44 ... screw hole

Claims (7)

A cutting edge portion and a holder for holding the cutting edge portion are provided.
The holder has an upper portion on one side in the direction in which the cutting edge portion extends, and a lower portion on the other side.
The other end of the cutting edge and the one end of the lower end are in contact with each other.
The upper portion has a first collar portion that is hooked from the other side on the lower portion.
The cutting edge portion is a punch die having a second flange portion that is hooked from the other side on the upper portion. The other end surface of the cutting edge portion and the other end surface of the upper portion are in contact with the same surface of the lower portion.
The punch die according to claim 1. The cutting edge portion has a cutting edge portion main body located on the one side and a second flange portion located on the other side end portion of the cutting edge portion main body.
The upper portion has a hole portion that penetrates in the direction in which the cutting edge portion extends.
The cutting edge body is held in the hole.
The punch die according to claim 1 or 2. The upper portion has a recess on one side of the first flange portion.
The lower portion has a third collar that is inserted into the recess.
The first flange portion is hooked on the other end portion of the third collar portion.
The punch die according to any one of claims 1 to 3. The first flange portion, the third flange portion, and the recess extend in a direction orthogonal to the direction in which the cutting edge portion extends.
The punch die according to claim 4. The upper portion and the lower portion have the same diameter when viewed in the direction in which the cutting edge portion extends.
The punch die according to any one of claims 1 to 5. The lower portion has a screw hole on the other side.
The punch die according to any one of claims 1 to 6.

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