Quality driven performance for drilling in composites and metals /
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| Other Authors: | , , |
| Format: | Thesis Book |
| Language: | English |
| Published: |
1992.
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| Subjects: | |
| Online Access: | Link to OAKTrust copy Link to ProQuest copy |
| Abstract: | This research consists of two main phases, a wear based study in traditional metals and a performance evaluation study for drilling in advanced composite materials. Three data sets were created and analyzed, one for the first phase and two sets for the second. In the first phase, the approach widely reported in the literature was used. The objective was the creation of a comprehensive drilling data bank for evaluating on-line monitoring of drilling in production. Steel and cast iron were drilled using HSS and cobalt bits. Using this data bank, a new approach was devised to monitor both tool life and burr formation. This new approach was based on in-process measurement of drilling time. Results indicated the feasibility of using this method when drilling in steel and aluminum. This data set is a resource for further research in on-line monitoring of drilling operations and others have used it to develop yet other algorithms. In the second phase, a new approach for evaluating the drilling process was introduced. Drilling performance was evaluated in composites and metals with hole quality used as the primary evaluation criterion. The method was named Quality Driven Performance (QDP). In the first experiment, thermoplastic composites, aluminum, and a stack of composite over aluminum were drilled with two drill designs. In the second experiment, two types of composites, a thermoplastic and thermoset matrix and two different aluminum alloys were tested using four drill designs. New experimental designs were developed for both experiments. In this phase, the development of quality driven performance approach was refined, the important drilling factors were identified and quality degradation as a new performance measure was introduced. Originally, The QDP was introduced for performance analysis only and was to be followed by traditional wear tests. It was found, however, that the experimental design allowed for wear compensation analysis. The two drilling data sets generated in this phase are a valuable resource for further studies in composite drilling. |
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| Item Description: | Vita. "Major subject: Mechanical Engineering." |
| Physical Description: | xix, 189 leaves : illustrations ; 28 cm |
| Bibliography: | Includes bibliographical references. |