Xingyu Zhu



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A mechanical press uses a linkage that oscillates a ram in order to form or cut sheet metal. This research develops design theories that use a unique mechanical linkage to obtain alternative ram oscillation patterns, such as a prolonged dwell. A geared five-bar press with sliding output is proposed to produce these alternative motions. In one alternative motion, an extended dwell involves a ram that remains near the bottom of the stroke while the crank continues to rotate. A prolonged dwell is ideal for coining operations. Non-linear loop closure equations are generated using isotropic coordinates. After specifying a desired motion pattern, an algorithm that uses the closure equations with numerical algebraic geometry obtains all possible sets of appropriate dimensions for the links. Lastly, a process to determine the best possible set is formulated.

Publication Date


Project Designation

Independent Research

Primary Advisor

Andrew P. Murray, Dave Harry Myszka

Primary Advisor's Department

Mechanical and Aerospace Engineering


Stander Symposium project, School of Engineering

Dimensioning Mechanical Presses Driven by a Geared Five-Bar for Desired Dwell using Advanced Algebraic Techniques