JPS587411B2 - blank mold - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a blank die for continuously cutting, for example, a large number of rectangular blanks from a strip-shaped plate material.

Conventionally, in order to cut a rectangular blank or a parallelogram blank, a vertical blade 21 and a horizontal blade 22 are used, as shown in FIG.
A mold consisting of a T-shaped combination of the two is used (the upper mold is not shown in Figure A), but there is a concave blade in the lower blade near the intersection 23 of the vertical blade 21 and the horizontal blade 22, for example. The upper blade must be provided with a convex blade portion 25 (see FIG. 2B) corresponding to the concave blade portion 24.

When cutting is performed using such a die, the convex blade portion 25 hits the steel plate at the initial stage of cutting, and the portion of the steel plate 1 cut by the convex blade portion 25 and the concave blade portion 24 is damaged as shown in Figure C. Such scratches 26 and burrs 27 are generated and remain.

If the blanks have cracks or cracks in this way, when a large number of blanks are stacked, the entire blank will not be at a constant height. disadvantages arise.

As a result, there are cases in which automatic feeding devices cannot be used, and there is also the drawback that these scratches and burrs cause defects in the blank material.

The purpose of the present invention is to eliminate the drawbacks seen in the prior art and to provide a blank mold that can smoothly produce a large number of blanks of a predetermined shape without causing cracks or creases in the blanks. be.

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

First, the embodiment shown in FIGS. 1 to 5 will be explained.

A long strip-shaped plate material, for example, a steel plate 1, is wound into a coil shape and supported by a roll 2, one end of which is fed in the direction of arrow X.

Guide rollers 3 and 4 guide both sides of the steel plate 1 so that the steel plate 1 passes through a predetermined course.

The vertical blades 5 of the lower die are arranged along the longitudinal direction of the steel plate 1, and in this embodiment are aligned with the center line of the steel plate 1.

The first horizontal blade 6 is continuous with one end of the vertical blade 5 and is formed so as to intersect with the vertical blade 5 at a predetermined angle (90° in this example), so that the first horizontal blade 6 is continuous with one end of the vertical blade 5 and intersects with the vertical blade 5 at a predetermined angle (90° in this example). It is arranged to extend across the left half.

The cutting edge of the second lateral blade 7 is spaced apart from that of the first lateral blade 6 in the direction of arrow X and is arranged so as to extend across the right half of the steel plate 1.

The cutting edge of the second horizontal blade 7 and the other end of the vertical blade 5 are slightly separated from each other in the direction of the arrow X, and a guide roller 8 is disposed there.

The conveyance roller 9 is arranged to be inclined laterally from the vertical blade 5.

Another conveyance roller 10 is arranged to be inclined from the second horizontal blade 7 along the supply direction of the steel plate 1 (arrow X direction).

As shown in FIGS. 2 and 3, the vertical blades 5' of the upper mold are arranged in correspondence with the vertical blades 5 of the lower mold, as in the conventional blank mold, and the vertical blades 5' of the upper mold Upper side blades 6' and 7' are also provided for the two horizontal blades 6 and 7, respectively.

Reference numeral 10 in FIG. 2 indicates a material presser.

FIG. 4 shows only the upper and lower molds for convenience of explanation, and the vertical blade 5 and the first and second horizontal blades 6 and 7 have the following configuration.

That is, when the length of the rectangular blank 11 to be punched from the steel plate 1 is A, and its width is B (half the width of the steel plate),
The length of the vertical blade 5 is C, the length of the first horizontal blade 6 is D, and the second horizontal blade 7
When the length of is E and the distance between the cutting edges of both horizontal blades 6 and 7 is F, the vertical blade 5 and the first and second horizontal blades 6 and 7 are F≧C≧A, D≧B, The configuration is such that E≧B.

However, if you want to manufacture two types of blanks, wide and narrow, when one width is B1 and the other width is B2, D≧B
1, E≧B2.

In the embodiment shown in FIG. 4, one end of the vertical blade 5 and the cutting edge of the second horizontal blade 7 are a little apart, so F
is naturally larger than C.

The operation of the above embodiment will be explained.

Steel plates 1 are sequentially fed to a blank die at a pitch of a desired rectangular blank length A.

Each time, the vertical blade 5 and the two horizontal blades 6 and 7 cut simultaneously.

As shown in FIGS. 5A and 5B, first, at the tip of the steel plate 1, No. The irregular blank shown at 1 is cut.

That is, the center line of the steel plate 1 is cut by the vertical blade 5, and the first
The left half of the steel plate 1 is cut by the horizontal blade 6.

In this case, the tip position of the steel plate is stopped within the range to be cut by the vertical blade 5.

Therefore, cutting by the second horizontal blade 7 is not performed.

No. cut in this way. The irregular material No. 1 is shorter in length than the desired blank shape.

Subsequently, the steel plate 1 is advanced by a predetermined pitch, that is, the length A of the blank, and cut in the same manner with the vertical blade 5 and the horizontal blades 6 and 7. The material indicated by 2 is cut.

As a result, the material is cut into the left half and the right half of the steel plate 1, but the cut material on the right half side is an irregular blank whose length direction is shorter than the desired blank shape, and the No. The blank shown at 2 is of the desired shape.

Similarly, No. 3 or less blanks of desired shapes are successively produced.

The blanks manufactured in this way are guided by conveyance rollers 9 in the direction shown by arrow Y for the left half of the steel plate 1, and conveyed in the direction of arrow Z for the blanks located on the right half of the steel plate 1. It is guided and conveyed by rollers 10.

As can be seen from Fig. 5 A and B, both of these embodiments are F
＞C＞A, but in order to save money by reducing the amount of scrap material generated at the beginning (on the right side of No. 1 and No. 2 in the diagram), the value of F should be made as small as possible. It is preferable to do so (as shown in Figure B).

In the case of the above embodiment, as shown in FIG.
There are places where the ridge lines 31 that are cut by the ridge line 31 overlap with each other, and it is actually difficult to make these ridge lines completely coincide with each other, so that a difference Δ as shown in the figure inevitably occurs.

In this case, it is good if this difference △ appears as shown in the figure, but if the ridge line 30 is located lower than the ridge line 31 in the figure, contrary to what is illustrated, it will not be possible to cut it completely, and even if it is possible to cut it, However, the undesirable result is that cracks, burrs, etc. occur in that part.

However, in the case of this embodiment, especially when F>C>A, a guide roller 8 can be disposed between the cutting edge of the second horizontal blade 7 and the end of the vertical blade 5, and this roller This prevents the previously cut ridgeline 30 from exceeding the ridgeline 31 formed by the vertical blade 5 and being located below in the figure, making it possible to cut the lapped portion of the ridgeline relatively easily.

6 and 7 show other embodiments of the invention.

The vertical blades 12 are arranged along the longitudinal direction of the steel plate 1 and coincide with the center line of the steel plate 1, as in the previous embodiment.

The first horizontal blade 13 is arranged to extend across the left half of the steel plate 1, and the second horizontal blade 14 is arranged to extend across the right half of the steel plate 1.

These vertical blades 12, first horizontal blades 13, and second horizontal blades 14 are continuously integrated or integrally configured,
It has the following relationship.

That is, the length of the rectangular blank is A, its width is B, the length of the vertical blade 12 is C, the length of the first horizontal blade 13 is D, and the second horizontal blade 1
4 is E, and the distance between these side blades 13 and 14 is F, then F=C=A, D≧B, E≧B (or D≧B1, as in the previous embodiment). E≧B2).

Therefore, when the steel plate 1 is blanked using the vertical blade and the horizontal blade shown in FIG. 6, the result will be as shown in FIG. 7.

When first blanking the tip of steel plate 1,
No. As shown in 1, an irregular material different from the desired blank shape is cut.

After that, No. 2. Blanks with desired shapes are manufactured by shifting by one pitch as shown below.

It is clear that the present invention is applicable not only to the production of rectangular blanks but also to the production of parallelogram blanks.

Since the blank die according to the present invention is constructed as described above, when continuously cutting long steel strips, there will be no scratches or burrs on each blank, and when the cut blanks are piled up, the product will not be damaged. etc., and the stack has a constant height, which is therefore extremely advantageous when used, for example, in automatic material feeders during press working.

[Brief explanation of the drawing]

FIG. 1 is a schematic perspective view showing an example of a blank mold according to the present invention and its related configuration, FIG. 2 is a schematic cross-sectional view of the blank mold shown in FIG. 1, and FIG. 3 is a schematic vertical cross-sectional view thereof. Figure 4 is a plan view of the lower mold, Figures 5 A, B, and C are explanatory diagrams showing how a large number of blanks are manufactured from steel plates using the blank mold, and Figure 6 is another example of the blank mold according to the present invention. FIG. 7 is an explanatory diagram showing the situation in which a large number of blanks of desired shapes are manufactured from steel plates using the blank mold, FIG. 8 is a diagram showing the conventional blank mold, and A is the lower mold. is a perspective view of FIG. 1... Steel plate, 2... Roll, 3, 4.
8...Guide roller, 5...Vertical blade, 6...
...First horizontal blade, 7... Second horizontal blade, 9,1
0... Conveyance roller, 12... Vertical blade, 1
3...First horizontal blade, 14...Second horizontal blade.

Claims (1)

[Claims] 1. In a blanking die designed to continuously cut blanks from strip-shaped plate materials, the cutting edge intersects a vertical blade arranged along the feeding direction of the strip-shaped plate material and the vertical blade at a predetermined angle to the vertical blade, and cuts the blank in the feeding direction of the strip-shaped plate material. The first part is arranged so as to extend across the left half or the right half of the
It is equipped with a horizontal blade and a second horizontal blade arranged so as to extend across the opposite half of the first horizontal blade in the feeding direction of the strip material, and the length of the blank to be cut is A, and the length of the blank to be cut is Width: B1
, B2, the length of the vertical blade is C1, the length of the first horizontal blade is D, the length of the second horizontal blade is E, the distance between the first horizontal blade and the second horizontal blade in the feeding direction of the strip material is F A blank mold characterized in that the vertical blade, the first horizontal blade, and the second horizontal blade are set so that F≧C≧A, D≧B1, and E≧B2.