| Summary: | 碩士 === 國立成功大學 === 機械工程研究所 === 82 === This work presents a design methodology of the drag-link drive
for mechanical presses in order to find the optimum dimensions
and suitable layer arrangement to satisfy the design
requirements of mechanical presses for cutting and drawing.
First , the kinematic characteristics of drawing and cutting
are studied. The evaluation items of presses performances and
the design specifications are proposed to establish the design
requirements for presses. The kinematic analysis of presses is
used to set up the mathemtical model of the displacement,
velocity, acceleration and jerk analysis. Three force analysis
models are provided for the various working processes. Because
there are a lot of design requirements for presses, a multi-
dimensional constrained optimum method is adopted to synthesize
the dimension of the mechanism. The objective functions and the
constraint equations are set up for every working process.
Based on the kinematic coefficients, a mathematical model is
proposed to determine suitable initial guesses for the optimum
design. Then a design algorithm for the dimensional synthesis
of the drag-link drive for mechanical presses is proposed, and
some design examples are provided. Furthermore, we provide a
method to determine the feasible layer arrangements of the drag-
link drive according to the strength analysis of links. The
design methodology proposed in this work is not only suitable
for the drag-link drive, but also suitable for other types of
linkage drive for mechanical presses.
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