handbook-die-design-2nd-edition Molding Documant Pdf

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In appendix; Handbook of Die Design . Document language is English. I hope it will be useful.


strip, and the side flanges are separated between this and the next station. The third and
fourth stations share the long rectangular back-line cut, where the second half of the material
of the third blank is removed at the same time as the first half of the material of the fourth blank.
Between the fourth and fifth station, all angular sections of side flanges are cut off, and
bending is then performed in the last, fifth station.
When assessing the strip layout in Fig. 10-26 for the economy of such positioning, only
a rough outline of the part may be calculated, provided that the same approach is used in all
subsequent evaluations. In order not to break through the edge of the strip, the usually recommended
Se distance will probably have to be increased, yet for the sake of practice, the originally
recommended 0.062 in. [1.57 mm] will be kept here. With the area of the part being
3.100 × 2.00 = 6.200 in.2
[78.74 × 50.80 = 4000 mm2]
and the area of the strip
(3.162 × 4.187):2 = 6.620 in.2
[(80.31 × 106.35):2 = 4270.48 mm2]
the square foot percentage will be
However, such a strip layout presents a definite disadvantage in the fact that all tooling
will have to be provided twice. This is caused by the mirror-image reversal of the part, which
prevents almost any conjunction in tooling arrangement. Where a rather simplified method of
tooling order is required, the parts should be as positioned on the strip, shown in Fig. 10-27.
The economical aspects of this strip layout are identical to Fig. 10-26. But where the
tooling previously had to be different for each row of parts, here it may be combined, which
may produce savings.
In the first station, the two pilot holes and two round openings are pierced simultaneously
with the two long relief slots. Between the second and third stations, the angular
material of the side flange is cut off, freeing one edge of each part with a single hit of a
square tooling.
The third station provides for the removal of the long back strip of material; in the fourth
station, the middle section is eliminated.
The web between the two parts goes at the transition between the fourth and the fifth
stations. The tool used for its removal is basically a rectangle, with a pilot tip attached to
its face by a threaded shank.
By cutting the web between, the final blank is separated from the strip, and all forming
is provided in the last, fifth station. It should be noted that the forming punch is slightly
shorter in order to finish cutting of the side web before any forming takes place.
The strip layout, as positioned on the die block, plus the cross section of the die are
shown in Fig. 10-28.
10-3-2 Sample Strip of a Support Bracket
Shown in Fig. 10-29 is another blank, already discussed in the preceding chapter. Its positioning
within the strip is rather awkward, leaving large areas unused and the economical
evaluation of


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