JPH0732059A - Press processing method - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a press working method capable of reducing the generation of indentations due to chips generated when trimming and scrap cutting are performed on a pressed product. [Structure] A trimming line TL set along a peripheral edge of a product portion Q of a pressed product P which is not cut into a scrap portion S,
In the scrap portion S outside the trimming line TL, the coining portion U is formed in advance at the intersection with the plurality of scrap cutting lines SL set from the outer peripheral edge Pa of the press product P toward the trimming line TL. Then, the plate thickness of the pressed product P at the intersection is thinned, and then the product part Q is cut along the trimming line TL by the trimming die and the scrap cut line SL by the scrap cutter.
The scrap portion S is cut along the line.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a press working method, and more particularly, to cutting a press product after draw forming along a trimming line set on the periphery of the product part, and at the same time to remove a scrap part separated from the product part. The present invention relates to a pre-processing method when cutting into a plurality of parts.

[0002]

2. Description of the Related Art Generally, for a pressed product after draw forming, a trimming die and a scrap cutter as disclosed in, for example, Japanese Utility Model Publication No. 56-6254 are used to set the periphery of the product portion. At the same time as cutting along the trimming line, the scrap portion outside the trimming line, which is separated from the product portion, is cut into a plurality of pieces.

FIG. 5 is a perspective view showing the structures of the trimming die and scrap cutter described above. The trimming die is composed of a trimming punch 1 which is a fixed member and a trimming die 2 which is a movable member. The trimming die 1 has a trimming die 1 which is a movable member. A series of trimming cutting blades 1a facing the trimming line TL set along the peripheral edge of the portion Q is provided, and scraps from the product portion Q are provided above the cutting blade 1a portion in cooperation with the cutting blade 1a portion. A trimming die 2 having a trimming cutting blade 2a for cutting the portion S is provided so as to be vertically movable.

Further, in order to divide and cut the scrap portion S along a plurality of scrap cutting lines SL set from the outer peripheral edge Pa of the pressed product P toward the trimming line TL, the trimming punch 1 is in contact with its side surface. , A plurality of scrap cutters 3 having scrap cutting cutting edges 3a are attached, but the cutting edges 3a of these scrap cutters 3 are slightly smaller than the cutting edge 1a facing the trimming line TL for manufacturing reasons. It is located below. And the trimming die 2
In order to prevent the upper end of the scrap cutter 3 from coming into contact with the cutting blade 2a of the trimming die 2 when the scrap cutter 3 descends, the trimming die 2 is provided with recesses 4 at positions corresponding to the scrap cutter 3, respectively. ing.

The escape portion 4 has a vertical wall portion 5 having a scrap cutting blade 5a at the lower edge, which faces the blade 3a of the scrap cutter 3, and a horizontal wall portion extending horizontally from the upper end of the vertical wall portion 5. 6 and an inclined wall portion 7 extending obliquely from the end of the horizontal wall portion 6 toward the trimming cutting blade 2a on the side opposite to the vertical wall portion 5 side. The scrap cutting blade 5a formed on the lower edge of the vertical wall portion 5 is formed in a relationship substantially orthogonal to the trimming blade 2a, and further on the edge portions of the horizontal wall portion 6 and the inclined wall portion 7. Trimming cutting blade 6
a and the trimming cutting blade 7a are provided respectively, the portion of the trimming cutting blade 2a removed by the existence of the escape portion 4 is the cutting blade 6a and the cutting blade 7a.
Supplemented by “a” and seen in a plan view, a continuous trimming cutting edge is formed in the trimming die 2.

With the above structure, the trimming punch 1
Trimming die 2 for pressed product P placed on top
Is lowered, the portion of the press product P which first comes into contact with the cutting edge 2a of the trimming die 2, that is, the portions A along the trimming lines TL on both sides of the relief portion 4,
A'is cut by the cutting blades 1a and 2a, and then the portion B of the inclined wall portion 7 of the trimming die 2 along the trimming line TL with which the cutting blade 7a gradually abuts is cut by the cutting blades 7a and 1a on the portion A side. It is gradually cut toward.
In this case, since the cutting blade 3a of the scrap cutter 3 is located slightly below the cutting blade 1a facing the trimming line TL, the cutting blade 5a of the vertical wall portion 5 of the trimming die 2 and the scrap cutter 3 are cut. Depending on the blade 3a,
The division cutting of the scrap portion S along the scrap cutting line SL is performed slightly later than the cutting of the portions A and A ′, and finally, the cutting blade 6 a of the horizontal wall portion 6 of the trimming die 2 and the cutting blade of the trimming punch 1. With 1a, the part C along the remaining trimming line TL is cut,
The scrap section S is completely separated from the product section Q.

[0007]

By the way, using the trimming die (trimming punch 1 and trimming die 2) and the scrap cutter 3 having the above structure, the scrap portion S is cut from the product portion Q, and When the scrap portion S is divided and cut, a portion A along the trimming line TL with which the cutting edge 2a of the trimming die 2 contacts,
A'is first cut by the cutting blades 1a and 2a,
Since the cutting edge 3a of the scrap cutter 3 is located slightly below the cutting edge 1a facing the trimming line TL, the vertical wall portion 5 of the trimming die 2 is, as described above.
Of the scrap portion S along the scrap cutting line SL by the cutting blade 5a of the No. 5 and the cutting blade 3a of the scrap cutter 3
The division cutting is performed slightly later than the cutting of the portions A and A ', and further, the portion C along the trimming line TL with which the cutting edge 6a of the horizontal wall portion 6 of the trimming die 2 abuts is finally cut. Due to the above reasons, when the scrap portion S is divided and cut, the end portion D of the scrap portion S that is in contact with the trimming line TL is broken, and chips are generated from this portion.

In the period from the cutting of the portion A to the division cutting of the scrap portion S by the scrap cutter 3, the scrap portion S not yet subjected to the division cutting by the scrap cutter 3 is moved downward by the trimming die 2. Since it is pushed down, stress concentrates on a portion of the uncut portion C adjacent to the portion A, and a tear K is generated in the pressed product P along the trimming line TL from the portion A side where the cutting is finished, and The crevice K tends to be formed in a sawtooth shape. Therefore, at the final stage of the trimming process, the portion C where the saw-toothed crack K is partially formed is linearly cut by the cutting blade 6a of the horizontal wall portion 6 of the trimming die 2 and the cutting blade 1a of the trimming punch 1. If so, the chips will frequently be generated from the site where the crack K has occurred.

Therefore, there is a problem that indentations due to these chips are generated on the surface of the pressed product P and the appearance of the pressed product P is impaired.

In view of the above-mentioned circumstances, the present invention provides a press working method capable of reducing the generation of indentations due to chips generated when the press product P is subjected to trimming and scrap cutting. To aim.

[0011]

According to the press working method of the present invention, a trimming line TL is set along the periphery of the product portion Q of the pressed product P that is not cut into the scrap portion S, and a trimming line TL outside the trimming line TL In the scrap portion S, an intersection of a plurality of scrap cutting lines SL set from the outer peripheral edge Pa of the pressed product P toward the trimming line TL is subjected to coining in advance, and the pressed product P in the intersecting part is cut. It is characterized in that the plate thickness is made thin, and then the product part Q is cut by the trimming die along the trimming line TL and the scrap part S is cut by the scrap cutter along the scrap cut line SL. It is what

According to one aspect of the present invention, the coining process is performed when the pressed product P is drawn.

[0013]

According to the present invention, the trimming line TL and the scrap cutting line SL set on the press product P are set before the trimming process and the scrap cutting process are performed on the press product P. Since the crossing portion is subjected to coining in advance to reduce the plate thickness at the intersection portion, the press product P is cut due to the breakage and tear of the end portion during the trimming processing and the scrap cutting processing. The amount of powder generated is reduced, which can reduce the problem of indentation on the pressed product P.

[0014]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows that, in the present invention, the thickness of the plate is thinner than other parts (for example, about 1/5) by coining.
FIG. 2 is a plan view of a main part of a pressed product P having a coining processed portion U formed to
Is a trimming line TL set along the periphery of the product portion Q of the pressed product P not cut into the scrap portion S, and the trimming from the outer peripheral edge Pa of the pressed product P in the scrap portion S outside the trimming line TL. For example, at the intersection with the plurality of scrap cutting lines SL set toward the line TL, it is formed at the same time as the drawing of the press product P and has a long elliptical shape whose longitudinal direction is along the trimming line TL. There is. In this embodiment, as is clear from FIG. 4, when the plate thickness of the pressed product P is 0.75 mm, the size of the coining processed portion U is about 4 × 10 mm and the plate thickness is 0.15 mm.

FIG. 2 is a cross-sectional view of a main part of a press working machine capable of forming a coining working portion U at the same time as the drawing of a pressed product P, 11 is a lower die, 12 is an upper die,
13 is a blank holder. A coining punch 14 is fixed to the upper die 12, and the coining punch 14 is vertically provided from a substrate 15 having two bolt insertion holes 15a, 15a as shown in the bottom view of FIG. It has a punch body 16. The punch body 16 is shown in FIG.
As shown in FIG. 3, it has a flat bottom surface 16a, and a part of this bottom surface 16a is an inclined surface 16b. In this embodiment, the plate thickness of the pressed product P is 0.75 mm, and the punch body 16 has an outer dimension of 4 mm × 10 mm × 30 mm (length). The lower end of the punch body 16 is the upper die 1
By projecting about 0.6 mm from the lower surface of No. 2, the thickness of the coining processed portion U becomes 0.15 mm, which is reduced to 1/5 of the thickness of the pressed product P.

The pressed product P, which has been subjected to the coining process in advance by the method as described above, is subjected to the trimming process and the scrap cutting process to obtain the product part Q.

Incidentally, the coining processed portion U remains little by little on the outer peripheral edge portion of the product portion Q thus obtained, but this outer peripheral edge portion is a portion which is usually folded in a later step. Therefore, even if the coining processed portion U remains, it does not have a bad influence on the product.

As is clear from the above description, in the present embodiment, the trimming line TL set on the press product P is set before the trimming process and the scrap cutting process are performed on the press product P. By subjecting the crossing portion with the scrap cutting line SL to a coining process in advance to reduce the plate thickness at the crossing portion, breakage and breakage of the end portion of the press product P during the trimming process and the scrap cutting process. As a result, the amount of chips generated due to the occurrence of is reduced, and it is possible to mitigate the problem of indentation on the pressed product P.

In this embodiment, the coining punch 1
Although the coining process is performed simultaneously with the drawing of the press product P using the press machine equipped with No. 4, the coining process may be performed in a process different from the drawing process.

[Brief description of drawings]

FIG. 1 is a plan view of a main part of a pressed product including a coining part to which the present invention is applied.

FIG. 2 is a sectional view of a press machine used to carry out the present invention.

FIG. 3 is a bottom view of a coining punch attached to the press machine shown in FIG.

FIG. 4 is an enlarged sectional view of a coining portion.

FIG. 5 is a perspective view for explaining the configuration and operation of a conventional trimming die and scrap cutter.

FIG. 6 is a plan view of a conventional pressed product that is subjected to trimming processing and scrap cutting processing.

[Explanation of symbols]

 1 Trimming Punch 1a Trimming Cutting Blade 2 Trimming Die 2a Trimming Cutting Blade 3 Scrap Cutter 3a Scrap Cutter 3 Cutting Blade 4 Relief 14 Coining Punch 16 Punch Main Body P Pressed Product Q Pressed Product S S Pressed Product Scrap TL Trimming Line SL Scrap cutting line U Coining processing department

Claims (2)

[Claims] 1. A trimming line that is set along the periphery of a product portion of a press product that has not been cut into a scrap portion, and a scraping portion outside the trimming line that is set from the outer periphery of the press product toward the trimming line. Coining is performed in advance at the intersection with a plurality of scrap cutting lines to reduce the plate thickness of the pressed product at the intersection, and then the product portion is cut along the trimming line by a trimming die. And a split cutting of the scrap portion along the scrap cutting line by a scrap cutter. 2. The press working method according to claim 1, wherein the coining process is performed at the time of draw forming of the press product.