JP2539572Y2 - Press mold with scrap cutter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) The present invention relates to a press die having a scrap cutter.

(Prior Art) For example, as shown in FIG. 7 and a cross section taken along the line AA of FIG. 8, after pressing a press material w, a press product p to be a product and a peripheral scrap s are separated. When
That is, when trimming with the shear line a along the outer shape of the pressed product p, in order to facilitate post-processing of the scrap s,
A scrap cutter for splitting and shearing the scrap s into a plurality of pieces at a scrap shear line b is incorporated in a press die.

Since this scrap cutter performs the shearing process in one step and in one stroke, the lower die 1 shown in FIG.
And an upper mold 2 indicated by a dashed line. The lower die 1 includes a lower blade 3 for continuous trimming, and a lower die scraper 5 that intersects the lower blade 3 with a step. On the other hand, an upper die 2 that moves up and down in opposition to the lower die 1 is provided in cooperation with a lower blade 3 so as to trim at a shear line a along the outer shape of the press product p, and intersect with the upper blade 4. An upper scrap cutter 6 which cooperates with the lower scrap cutter 5 to divide the scrap s along the scrap shear line b. Further, the upper blade 4 provided on the upper die 2 is provided with a portion 4a in which the blade is shorter than other portions as a relief portion 8 of the lower die scrap cutter 5 corresponding to the lower scrap cutter 5 attached to the lower blade 1. Have been.

In such a press die, after the press material w is placed and positioned on the upper surface of the lower die 1, the upper die 2 is placed on the lower die 1.
, And is sheared along the shear line a by the cooperation of the lower blade 3 and the upper blade 4 of the lower die 1. When the upper mold 2 is further lowered, the discontinuous portion a 'of the shear line a generated by the relief portion 8 formed on the upper blade 4 is not sheared by the press material w during the press working as shown in FIG. . At this time, the product and the scrap are connected at the part a ', but the distortion occurs due to the step of the upper blade, and the scrap is torn to produce a broken part wd,
A break wa occurs between the shear line a and the break line wd. In this state, the upper die 2 further descends, and the shear line is formed by the engagement between the lower blade 3 and the portion 4a of the upper blade 4 and the upper scrap cutter 6 formed in the escape portion 8 of the upper die 2. The discontinuous part a 'of a and the scrap shear line b are sheared to obtain a pressed product p and scrap s.

However, the breaks wa and wd generated at the boundary between the shear line a and the scrap shear line b due to the clearance 8 formed in the upper die 2
Will be sheared again and the chips will be released. Therefore, during press molding, chips may damage the product or cause protrusions, and furthermore, there is a problem that a concave portion is formed on the surface of the press die and the die needs to be corrected.

As a countermeasure, it is disclosed in Japanese Utility Model Laid-Open No. 57-37527,
As shown in FIG. 6, a continuous lower blade 3 is provided on the lower die 1, and the upper die 2 is provided with an upper blade 4 meshing with the lower blade 3 in a portion other than the escape portion 8, and the escape portion 8 is trimmed at the time of trimming. Upper blade 4
The upper blade 10 provided on the lower die 1 and the upper blade 4 and the auxiliary upper blade 10 provided on the upper die 2 are trimmed by providing an auxiliary upper blade 10 which retreats into the escape portion 8 at the time of scrap shearing. Thereafter, the scrap s is cut by the upper scrap cutter 6 formed on the upper die 2 and the lower scrap cutter 5 provided on the lower die 1, and the press product p and the scrap s are separated from the press material w. A type has been proposed.

(Problems to be Solved by the Invention) According to the above prior art, a press product and a scrap are formed by cooperation of a lower blade provided on a lower die, an upper blade provided on an upper die, and an auxiliary upper blade formed on an auxiliary product cutting blade. After separating the scrap, the upper mold scrap cutter and the lower mold scrap cutter provided in the upper mold separate the scrap, thereby preventing breakage of the press material due to the escape portion, preventing the release of chips, and preventing product damage due to chips. , Can prevent the occurrence of projections. However, since the auxiliary product cutting edge provided in the escape of the upper die is movable with respect to the upper die, the structure becomes complicated, and the position setting of the upper blade and the auxiliary upper blade is troublesome, and high-quality trimming is performed. However, there are disadvantages such as difficulty in adjustment and difficulty in obtaining a stable product over a long period of time.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a press die having a scrap cutter capable of supplying a high-quality press product which is simple in structure and stable over a long period of time.

(Means for Solving the Problems) To achieve the above object, a press die having a scrap cutter according to the present invention includes a lower cutter for trimming and a lower scrap cutter extending in a direction intersecting with the lower cutter. When the press material is placed on the upper surface provided on the mold scrap cutter, a lower mold having a support portion for supporting a peripheral portion of the press material, and an upper mold moving up and down opposite to the lower mold are provided. An upper blade that cooperates with the blade to shear the press member and an upper die cutter provided in the upper die that extends in a direction intersecting with the upper blade that divides the scrap in cooperation with the lower die cutter. In the press die having, the upper blade has a relief portion to avoid contact with the lower scrap cutter, and when the upper die is lowered to the junction with the lower blade of the lower scrap cutter, the upper blade is Between lower scrap cutters And a non-contact area for avoiding contact between the upper scrap cutter and the lower scrap cutter.

(Operation) By lowering the upper die to the inside of the concave portion by lowering the upper die, the portion of the lower blade and the upper blade except for the escape portion is sheared, and at the same time, the scrap is sheared by the upper scrap cutter and the lower die scrap cutter. Further, by lowering the upper die, the pressed material is separated into the pressed product and the scrap at a portion corresponding to the clearance between the lower blade and the upper blade.

In addition, when the press material is placed on the lower mold, the movement of the press material when the press material is divided into the press product and the scrap can be prevented by supporting the press material with the support portion of the lower mold scrap cutter.

(Embodiment) Hereinafter, an embodiment of a press die having a scrap cutter according to the present invention will be described with reference to the drawings. In FIGS. 1 to 3, parts corresponding to FIGS. 4 to 8 are denoted by the same reference numerals for convenience of explanation.

FIG. 1 is a perspective view showing a main part of the present invention, and FIG. 2 is a sectional view taken along the line II of FIG.

The lower die 1 has a lower blade 3 for continuous trimming and a lower scrap cutter 5 intersecting with the lower blade 3, and a joint between the lower die 3 and the lower cutter 3 as shown in FIG. A concave portion 7 having a width l of, for example, 2 to 3 mm is formed to allow the upper blade 4 provided on the upper die 2 to enter when the upper blade 4 of the upper die 2 is lowered. Further, a lower mold 1 is provided on the upper surface of the lower scrap cutter 5.
When the press material w is placed and positioned on the upper surface 1a, a support portion 9 for supporting a peripheral portion serving as a scrap s of the press material w from below is formed.

On the other hand, the upper die 2 that moves up and down in opposition to the lower die 1 cooperates with the lower blade 3 to trim the press material w at a shear line a along the outer shape of the pressed product p, and the upper blade 4 It has an upper scrap cutter 6 that is provided to intersect and shears along the scrap shear line b in cooperation with the lower scrap cutter 5. When the upper die 2 descends into the concave portion 7 formed at the joint between the lower blade 3 and the lower scrap cutter 5, the upper scrap cutter 6 and the lower scrap cutter 5 are in a non-contact state. It has a non-contact area 7a.

Further, the upper blade 4 provided in the upper die 2 has a shorter blade than other parts as a relief portion 8 corresponding to the lower die scrap cutter 5 attached to the lower die 1 to allow the lower die cutter 5 to be fitted. A portion 4a is provided.

Next, the use of the press die having the scrap cutter thus configured will be described.

As shown in FIG. 2, the press material w is positioned and placed from the upper surface 1a of the lower mold 1 to the support 9 formed on the lower scrap cutter 5.

Next, the upper die 2 is lowered, and the lower blade 3 formed on the lower die 1 and the upper blade 4 excluding the portion 4a formed on the upper die 2 cooperate to form a shear line a along the outer shape of the pressed product p of the press material w. At the same time, the outer peripheral portion of the press material w to be scrap s is sheared by the lower scrap cutter 5 and the upper scrap cutter 6 along the scrap shear line b. At this time, the press material w is supported by the upper surface 1 a of the lower die 1 and the bearing surface 9 formed on the lower die cutter 5. Therefore, no break called the flow of the press material w occurs, and no broken portion wa occurs. A portion wb of the press material w facing the recess 7 formed in the lower scrap cutter 5 shown in FIG. 2 corresponds to the non-contact area 7a, and the lower scrap cutter 5 and the upper scrap cutter 6 are non-contact. It is broken due to the contact state, and as shown in FIG. 3, the shear line a and the scrap shear line except for the discontinuous portion wa 'of the shear line a formed by the escape portion 8 formed on the upper blade 4. b shears.

Further, the upper die 2 is lowered, and a shear line a is formed by a portion 4a corresponding to the clearance 8 of the upper blade 4 and the lower blade 3 formed in the lower die 1.
Shearing the discontinuous part wa 'of the press material w
It is divided into p and scrap s. Therefore, the press product p and the scrap s are cut in one step and one stroke, and the scrap s is cut into an appropriate size.

At this time, the press material w is supported by the upper surface 1a of the lower die press 1 and the bearing 9 formed on the lower scrap cutter 5, and the rigidity of the press material w suppresses the deformation of the portion that becomes the scrap s. The portion wb of the mold scrap cutter 5 facing the concave portion is stably broken, and furthermore, the lower mold scraper 5 and the upper scrap cutter no longer engage at the boundary between the scrap shear line b and the shear line. Cutting is not performed, and generation of chips is prevented.

(Effect) According to the press die having the scrap cutter according to the present invention, when the upper die descends to the lower blade and the joining portion of the lower scrap cutter, the upper blade is allowed to enter between the lower blade and the lower scrap cutter. A simple structure that forms a bearing that supports the periphery of the pressed material on the lower scrap cutter, and the shear line between the pressed product and the scrap cutter and the break generated at the boundary between the scrap shear line. Cutting, that is, cutting twice, is prevented, and the generation of chips due to the engagement of the lower scrap cutter and the upper die cutter is prevented. Products can be supplied for a long time.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a main part of an embodiment of a press die having a scrap cutter according to the present invention, and FIG.
3 is an enlarged sectional view taken along the line I, FIG. 3 is a perspective view of a main part illustrating a press material in the middle of press working, FIG. 4 is a perspective view of a main part of a conventional press die having a scrap cutter, and FIG. FIG. 6 is a perspective view of an essential part for explaining a press material in the process of being processed by the press die of FIG.
The figure is an illustration of the press material and product, FIG. 8 is A in FIG.
It is sectional drawing which follows the -A line. DESCRIPTION OF SYMBOLS 1 ... Lower mold, 2 ... Upper mold, 3 ... Lower blade, 4 ... Upper blade, 5 ... Lower scrap cutter, 6 ... Upper scrap cutter, 7 ... Recessed part, 8 ... Relief part, 9 ... Bearing part, w ... Press material, p… Press product, s… Scrap

Claims (1)

(57) [Scope of request for utility model registration] A lower blade for trimming and a lower scrap cutter extending in a direction intersecting with the lower blade are provided on a lower scrap cutter. When the press material is placed on the upper surface, the peripheral edge of the press material is removed. A lower die having a supporting portion for supporting, an upper blade provided on an upper die moving up and down opposite to the lower die, cooperating with the lower blade, and cooperating with the lower die scrap cutter In a press die having an upper blade that is provided on an upper die extending in a direction intersecting with an upper blade that divides the scrap, the upper blade has a relief portion that avoids contact with the lower die scrap cutter. The upper blade is provided with a concave portion that allows the upper blade to enter between the lower blade and the lower scrap cutter when the upper die is lowered to a joint portion between the lower die scrap cutter and the lower blade, and the upper die scrap is provided in the concave portion. Cutter and lower scrap cutter Press die having a scrap cutter which is characterized by having a non-contact range to avoid contact of the.