Quick-return mechanisms are quite common in manufacturing processes. e.g in pick-and-place operations, metal-cutting, and metal-forming, where dwell is usually required. Dwell is the period where a driven link remains stationary and the tool can be replaced or the workpiece can undergo a machining operation. Unlike lower-pair mechanisms, cam mechanisms can produce dwell exactly. / In this thesis, cam-follower systems are used as building modules in the design of quick-return mechanisms. The underlying cam mechanisms are optimized to obtain a compact, quick-return mechanism. A unified method for the optimization of cam mechanisms is proposed. The optimum parameters of the cam mechanism are obtained by cam-area minimization subject to performance and geometric constraints. In addition, the power required from the motor is reduced by adding an elastic torque-compensation mechanism to the system. A Graphical User Interface is developed to aid the designer during the design process. / The modular method is applied to the synthesis and optimization of long-stroke, quick-return mechanisms. In addition, the design of a simple cam mechanism to replace the transmission mechanism of a textile machine composed of an elliptic-gear train and a four-bar linkage is also included as an application example.
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:QMM.20931 |
| Date | January 1998 |
| Creators | Wu, Chu-Jen. |
| Contributors | Angeles, Jorge (advisor) |
| Publisher | McGill University |
| Source Sets | Library and Archives Canada ETDs Repository / Centre d'archives des thèses électroniques de Bibliothèque et Archives Canada |
| Language | English |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
| Format | application/pdf |
| Coverage | Master of Engineering (Department of Mechanical Engineering.) |
| Rights | All items in eScholarship@McGill are protected by copyright with all rights reserved unless otherwise indicated. |
| Relation | alephsysno: 001641656, proquestno: MQ50676, Theses scanned by UMI/ProQuest. |
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