JP5499060B2 - Press dies and drawn products - Google Patents

Description

  The present invention relates to a press die capable of integrally forming a specific part that can be printed or stamped with a product identification display, for example, a product management number, in a subsequent process by drawing.

  FIG. 11 is a perspective view of a conventional vehicle floor panel, and the vehicle floor panel 100 is obtained by drawing a blank material with a press die and trimming it.

As shown in FIG. 12, for example, a product management number 101 is printed or stamped on the vehicle floor panel 100 as a product identification display. This product management number 101 is used for a post-process and a follow-up survey after shipment.
By the way, foreign materials such as dust and iron powder adhere to the blank material during transportation. Although cleaning may be performed before drawing, foreign matter that could not be removed may remain. , Simply referred to as irregularities).

As shown in FIG. 13, the drawn article 102 is generally provided with unevenness 103. The unevenness 103 is equally attached to the specific portion 104 designated by width W × length L.
Depending on the form of the unevenness 103, the character 105 becomes unclear.

  As a countermeasure, it is conceivable to sharpen only the specific portion 104 before printing or stamping. However, the regular character 105 is cut and sharpened, so that it is not possible to distinguish between the character (non-regular character) and the regular character 105, so that the specific portion 104 is not allowed to be sharpened.

  Therefore, if the specific portion 104 has unevenness 103 having a depth or size exceeding the allowable value, the drawn product 102 is discarded as a unit (scraping). This deteriorates the yield and increases the production cost of the drawn product.

  As another countermeasure, it is conceivable that the drawn product is not roughened at the drawing step (see, for example, Patent Document 1 (FIG. 1)).

Patent document 1 is demonstrated based on the following figure.
FIG. 14 is a view for explaining a conventional mold, and an infinite number of recessed portions 112 are provided on the molding surface 111 of the lower mold 110. The recessed portion 112 is an annular groove.
Since the foreign matter falls into the recessed portion 112, the molding surface 111 becomes clean and the occurrence of unevenness can be prevented.

  However, if the countless recessed portions 112 are processed on the molding surface 111 of the lower mold 110, the processing cost increases, and the mold becomes extremely expensive. Therefore, this measure is difficult to adopt.

  Therefore, a structure that can reduce the die cost is required in a press die that does not give unevenness to a specific part.

JP 2010-240688 A

  This invention makes it a subject to provide the structure which can reduce metal mold | die cost in the press metal mold | die which does not give an unevenness | corrugation to a specific site | part.

The invention according to claim 1 is a press die capable of integrally forming a specific part that can be printed or stamped with a product identification display in a subsequent process by drawing.
The press mold includes a general molding surface and a surface that protrudes or is recessed from the general molding surface and forms a blank material larger than the general molding surface.
The general molding surface of the lower mold for molding squeezing the blank, under the specific portion forming portion that forms the specific portion is provided on the lower specific portion forming section, more than the diameter of the foreign matter adhering to the blank A depth relief is provided,
An upper specific portion forming portion for forming the specific portion is provided on the general molding surface of the upper mold for drawing the blank material, and the upper specific portion forming portion exceeds the diameter of the foreign matter attached to the blank material. A depth relief portion is provided.

The invention according to claim 2 is characterized in that the depth of the escape portion is set to at least 1.0 mm .

  The invention according to claim 3 is characterized in that the lower specific part forming part protrudes or is recessed from the general surface of the lower mold, and the upper specific part forming part is recessed or protrudes from the general surface of the upper mold. And

  The invention according to claim 4 is a drawn article characterized in that a specific part is formed by drawing with the press die according to any one of claims 1 to 3.

  In the invention according to claim 1, the specific part is formed by the lower specific part forming part and the upper specific part forming part. At this time, due to the presence of the escape portion, no pressing force is applied to the lower die and the upper die at the specific portion. Therefore, even if foreign matter is attached to the blank material, there is no fear that the specific portion is uneven due to the presence of the escape portion.

  There is no need to provide innumerable recesses in the press die, and it is only necessary to provide the lower specific portion forming portion and the upper specific portion forming portion only in the specific portion, and an increase in the press die cost can be suppressed.

  In the invention which concerns on Claim 2, the depth of the escape part is set larger than the diameter of the foreign material adhering to a blank material. Even if foreign matter adheres to the blank material, the foreign matter is accommodated in the escape portion, so that there is no further concern that the specific portion is uneven.

  In the invention which concerns on Claim 3, the lower specific part formation part protrudes or hollows from the general surface of a lower mold | type, and the upper specific part formation part is depressed or protrudes from the general surface of an upper mold | type. Due to the presence of the escape portion, it is worried that a specific part undulates. However, when the blank material is sandwiched between the lower specific portion forming portion and the upper specific portion forming portion, tension along the molding surface is applied to the blank material. Due to this tension, the specific part becomes flat.

  The invention according to claim 4 is a drawn product in which a specific part is formed by drawing with the press die according to any one of claims 1 to 3. This draw-molded product has no irregularities at specific parts. Product yield is improved and the production cost of drawn products can be reduced.

It is sectional drawing of the press metal mold | die which concerns on this invention. FIG. 2 is an enlarged view of part 2 of FIG. 1. FIG. 3 is a view taken along arrow 3-3 in FIG. 2. It is a figure which shows the form before drawing. It is a figure which shows the form after drawing. It is a perspective view of a draw-formed product. FIG. 7 is an enlarged view of part 7 of FIG. 6. It is a figure which shows the example of a change of FIG. It is a figure which shows the example of a change of FIG. It is a figure which shows the further example of a change of FIG. It is a perspective view of the conventional floor panel for vehicles. FIG. 12 is an enlarged view of 12 parts in FIG. 11. It is a figure explaining the conventional subject. It is a figure explaining the conventional metal mold | die.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals.

  As shown in FIG. 1, the press die 10 includes a lower die 12 supported by a bolster 11, an upper die 14 supported by an upper frame 13, and a blank holder 15 that presses a blank material against the upper die 14.

  In addition, the structure of the press machine which operates the press die 10 can be selected suitably. That is, the lower die 12 may be stationary and the upper die 14 may be raised or lowered, or the upper die 14 may be stationary and the lower die 12 may be raised or lowered, or both the lower die 12 and the upper die 14 may be moved up and down. In short, the upper mold 14 only needs to move relative to the lower mold 12.

  As shown in FIG. 2, a lower specific part forming portion 17 is locally formed integrally with the lower mold 12 in order to form a specific part. In this example, the lower specific part forming part 17 protrudes upward from the general surface (general molding surface) 18 of the lower mold 12. And the relief part 19 dented downward is provided in the lower specific part formation part 17 convex upward.

The depth D1 of the escape portion 19 is set larger than the outer diameter of foreign matter such as dust or metal powder.
Empirically, since the outer diameter of the foreign matter is 0.5 mm or less, the depth D1 of the escape portion 19 is set to 1.0 mm or more. Furthermore, in consideration of the volume of the foreign matter, the strength of the mold, the production of the relief portion, etc., it is desirable to set it to 3.0 mm or more.

In order to form a specific part, the upper specific part forming part 21 is integrally formed in the upper mold 14 locally. In this example, the upper specific part forming portion 21 is recessed upward from the general surface 22 of the upper mold 14. And in the upper specific part formation part 21 concave on the upper side, an escape part 23 that is recessed upward is provided.
Similarly, the depth D2 of the escape portion 23 is desirably set to 1.0 mm or more, preferably 3.0 mm or more.

  3 is a view taken in the direction of the arrow 3-3 in FIG. 2, and the lower specific portion forming unit 17 includes a top portion 24 that surrounds the W × L escape portion 19 and a slope 25 that surrounds the top portion 24. Since W × L corresponds to the size of the specific part, the lower specific part forming unit 17 is made slightly larger than the specific part.

Next, the operation of the lower specific part forming unit 17 and the upper specific part forming unit 21 configured as described above will be described.
As shown in FIG. 4, a blank material 26 is placed on the lower mold 12. The blank material 26 is inevitably placed on the lower specific part forming unit 17. The blank material 26 has a foreign material 27 attached to the upper surface and a foreign material 28 attached to the lower surface.
As part of the pressing process, the upper die 14 is lowered as indicated by the white arrow.

  As shown in FIG. 5, the blank material 26 is squeezed by the lower mold 12 and the upper mold 14. At this time, the specific part 30 is formed by the lower specific part forming part 17 and the upper specific part forming part 21. At this time, the foreign matter 28 attached to the lower surface is accommodated or dropped in the escape portion 19 on the lower mold 12 side, and the foreign matter 27 attached to the upper surface is accommodated in the escape portion 23 on the upper die 14 side. Therefore, in the specific part 30, there is no fear that the foreign substances 27 and 28 bite into the specific part 30.

  Note that the presence of the escape portions 19 and 23 is worried that the specific portion 30 undulates. However, when the blank material 26 is sandwiched between the upper specific portion forming portion 17 that is convex upward and the upper specific portion forming portion 21 that is concave upward, tension (force on the left and right in the drawing) is applied to the blank material 26, The specific part 30 is pulled flat.

  The above operation will be described in detail. The blank 26 is clamped on the outer peripheral surface by the blank holder shown in FIG. Next, the blank material 26 is bent by the lower specific part forming part 17 relatively entering the upper specific part forming part 21 in a clamped state. At this time, the blank material 26 is pushed down at the corner of the upper specific portion forming portion 21 at the portion of the apex 21a with the rounded vertex 17a of the lower specific portion forming portion 17 as a bending start point. The portion between the vertex 17a and the vertex 21a is strongly pulled. As a result, the left and right vertices 17a and 17a are strongly drawn and flattened.

FIG. 6 shows a drawn product that has been drawn with the press die 10 of the present invention. A specific portion 30 is locally formed in the drawn product 31.
As shown in FIG. 7, the specific portion 30 having a size of W × L is not uneven.
If there is no unevenness, it is not necessary to discard the drawn product 31, the product yield is improved, and the production cost of the drawn product 31 can be reduced.

  Further, as shown in FIG. 1, it is not necessary to provide the press mold 10 with innumerable recesses, and it is only necessary to provide the lower specific portion forming portion 17 and the upper specific portion forming portion 21 only at the specific portion. Can be suppressed.

Hereinafter, modified examples according to the present invention will be described with reference to the drawings. In addition, the code | symbol is diverted and only a changed part is demonstrated.
As shown in FIG. 8A, the escape portion 23 can be provided only in the upper specific portion forming portion 21.
As shown in FIG. 8B, the foreign material 27 on the upper surface of the blank material 26 is accommodated in the escape portion 23.

Even if the foreign materials 27 and 28 are attached to the blank material 26, the presence of the escape portion 23 does not apply a pressing force to the lower mold 12 and the upper mold 14 at the specific portion 30. Therefore, there is no worry that the appearance surface (the upper surface in this example) of the specific portion 30 is uneven.
However, it is inevitable that the lower surface of the specific part 30 is uneven. In that respect, the structure of FIG. 4 is superior.

  Further, as shown in FIG. 9, the top and bottom are reversed, and the lower mold 12 is provided with a lower specific part forming portion 17 that is depressed downward, and the upper mold 14 is protruded downward to form the upper specific part forming portion 21. May be provided.

  As described above, the existence of the escape portions 19 and 23 is important. Therefore, as shown in FIG. 10, the relief portion 19 may be provided directly on the general surface 18 of the lower mold 12, and the relief portion 23 may be provided directly on the general surface 22 of the upper die 14.

In addition, although this invention is suitable for press molding of the floor panel for vehicles, if it is various panels for vehicles, a use will not ask | require. In addition, the present invention can be applied to panels other than the vehicle panel as long as it is a drawn molded product that prints or stamps a product identification display.
Further, the product identification display only needs to be an Arabic numeral, a Chinese numeral, an alphabet, other symbols, or a combination of these, and is not limited to the product management number.

  The present invention is suitable for press molding of a vehicle floor panel.

  DESCRIPTION OF SYMBOLS 10 ... Press die, 12 ... Lower mold, 14 ... Upper mold, 17 ... Lower specific part formation part, 18 ... General surface of a lower mold, 19 ... Relief part on the lower mold side, 21 ... Upper specific part formation part, 22 ... General surface of upper mold, 23 ... Escape part on upper mold side, 26 ... Blank material, 27, 28 ... foreign matter, 30 ... specific part, 31 ... drawn molded product, 101 ... product management number as product identification display.

Claims (4)

In a press mold that can integrally form a specific part that can be printed or stamped with a product identification display in a subsequent process by drawing,
The press mold includes a general molding surface and a surface that protrudes or is recessed from the general molding surface and forms a blank material larger than the general molding surface.
The general molding surface of the lower mold for molding squeezing the blank, under the specific portion forming portion that forms the specific portion is provided on the lower specific portion forming section, more than the diameter of the foreign matter adhering to the blank A depth relief is provided,
An upper specific portion forming portion for forming the specific portion is provided on the general molding surface of the upper mold for drawing the blank material, and the upper specific portion forming portion exceeds the diameter of the foreign matter attached to the blank material. A press die characterized by a depth relief. The press die according to claim 1, wherein a depth of the escape portion is set to at least 1.0 mm .   The lower specific part forming part protrudes or is recessed from the general surface of the lower mold, and the upper specific part forming part is recessed or protrudes from the general surface of the upper mold. The press die according to claim 1 or 2.   4. A drawn article characterized by being drawn by the press die according to any one of claims 1 to 3 to form the specific part.

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