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on different plates have complex correlated relations for
different kinds of correlating parts or assembles, such as
punches, dies, screws, pilot pin assembles, lifter pin
assembles, etc. When the parameters or location is
changed for the correlating parts, the size or the location
must also change to fit, which cannot be defined and
achieved by functions provided by general 3D CAD
software. Hence, the relationship among the holes, the
correlating parts (or assembles), and the correlated plates
must be studied on the basis of relevance. So in this paper,
we first give classification for holes on plates by structure
then analyze the relationship between the plate holes and
associated parts and present a descriptive model.2.1 Hole classification by structure
By studying the structure of the progressive dies, six types
of holes are summarized according to their structure. They
are through hole, step hole, blind hole, screw hole, figure
hole, and combined hole. The characters of the different
kinds of holes are listed below in detail.
2.1.1 Through hole
The hole goes through the plate. The assemble of guideposts
and bushes which are employed for aligning the die set
associates with the upper die shoe, the stripper holding plate,
and the bottom die shoe, as shown in Fig. 2. The holes on the
stripper holding plate and the bottom die shoe are through holes.
2.1.2 Step hole
The hole has one or two steps. As shown in Fig. 3, when
screws and pins are employed to connect and locate two
plates, the step holes are usually adopted. In Fig. 1, the hole
on upper die shoe is also a step hole for amounting the
guide seat and the housing plate.
2.1.3 Blind hole
The hole is blind. Figure 4 shows that a slot punch is
amounted on the punch holding plate by a supporting plate
and a screw. A blind hole must be constructed on the
stripper holding plate below in order to avoid colliding
when the upper die set moves down to shear.
2.1.4 Screw hole
The screw hole is mainly used for screw. As shown in
Fig. 3, a screw hole is constructed on the connected plate.
2.1.5 Figure hole
The figure hole is mainly for noncircular punches and dies.
As shown in Fig. 4, the slot punch which is formed by wire
electrical discharge machining goes through punch holding
plate, stripper holding plate, and stripper plate. The contour
of figure holes on the three plates is as same as that of slot
punch, while the fits and tolerance are different. In addition,
when the outside contour of the die inserts is noncircular,
the hole on die holding plate is also regarded as figure hole,
as shown in Fig. 5.
2.1.6 Composite hole
The composite hole means that the geometric structure of
the hole is complex and can be viewed as the combinationof several simple holes. For example, in order to facilitate
the installation and lifting, usually four hook screws are
mounted on large plates such as upper die shoe, bottom die
shoe, and stripper plate, and the holes for hook screws are
combined holes as shown in Fig. 6. Usually on the
progressive die, typical components such as pilot pin
assemble and lifter pin assemble are employed which are
composed by plug screw, spring, cylinder pin, pilot, or
lifter. Figure 7 shows one pilot pin assemble and the holes
on the correlated plates. The hole on upper die shoe is a
composite hole that consists of a through hole and a screw
hole.
2.2 Classification according to the relationship
between the correlating parts and correlated plates
From the points of relevance, the above-mentioned various
holes associate the correlating parts (or function assemble)
and the correlated plates. The relationship between the