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a progressive die company, this study describes a hole
design system based on function feature in SolidWorks
software.
There are several commercial progressive die design
systems available in the market, e.g., progressive die
wizard on NX, progressive die expert on Pro/ENGINEER,
LOGPRESS on SolidWorks, TopSolid/Progress, et al.
These packages can fulfill the holes design in condition
that the users set up their own part library and make some
customization. As the die companies are mainly small-
and medium-sized enterprises, discussion with the local
tool and die industry indicates that those systems are too
expensive and beyond what they could afford to invest in.
In addition, the commercial packages for progressive die
contain “generic” design rules provided by die design
textbooks, course materials, component manufacturer’s
catalogues, etc., while each die company concentrates on
several classes of dies and has its own company’s specific
design rules, parameters, and tooling components. Hence,
the development of hole design system is necessary
especially for the companies which have their own
specific component library and in-house design rules.
In order to make die design more flexible and efficient
with higher quality, this paper proposes a computer-aided
structural design system of holes on the plates of
progressive die based on functional feature according to a
set of design rules of a local progressive die company.
Taking advantage of well-organized die design knowledge
base, standard parts database, hole feature library database,
and an integrated 3D CAD environment, our system is ableto output hole structure correlated design for the main
plates of a progressive die, such as upper die shoe, lower
die shoe, punch holding plate, punch backing plate, die
holding plate, and so on. Upon user’s input of strip layout,
selection of die set, and design information of correlating
parts, the parts are inserted into the die assemble, and
correlated holes on the plates are constructed automatically.
A system has been implemented which is interfaced with a
parametric and feature-based CAD system, SolidWorks
through C++. An example is provided to demonstrate our
approach and to show its effectiveness in progressive die
design.
The rest of the paper is organized as follows: Section 2
describes the design procedure for progressive die, hole
classification, and the descriptive model for design of hole
on plates for progressive dies. Section 3 explains the
architecture of the structural design system for holes on
plates and deals with the process for constructing the holes
design with the help of library feature in detail. Section 4
demonstrates the hole designing of a progressive die for the
motor core using the proposed system. Conclusions are
given in Section 5.
2 Hole classification and the descriptive model
for progressive dies
The structure of a progress die usually consists of an upper die
shoe, a lower die shoe, a punch holder plate, upper backing
plates, a lower plate, a punch backing plate, a die backing
plate, and other die structure components required by each
process station such as punches, dies, strip guide pins, lifters,
guide posts and bushings, et al., as shown in Fig. 1.
Figure 1 shows the structure of a typical progressive
die. There are a lot of holes on the main parts such as
upper die shoe, lower die shoe, punch holder plate, upper
backing plates, die holder plate, punch backing plate, die
backing plate, etc., which are used for connecting,
locating, and installing. The holes are different in
structure, function, tolerance, and fit. Meanwhile, holes