| Summary: | 碩士 === 國立中正大學 === 光機電整合工程所 === 93 === Rapid Prototyping (RT) is a kind of production technology which transfers concept design to product design for shortening product design period to rapid manufacturing product prototyping. Rapid Tooling (RT) can be seen as extension of RP. Yet, RT can manufacture stronger mold and functional component than RP does. In recent years, functional component and production are valued gradually. Yet, the problem is how to combine these two different kinds material but don’t raise the problems, that is, radius stress or coefficient of thermal expansion mismatches. Functionally graded materials (FGM) technology is proposed to apply to functional component. Buffer layer which forms by FGM between two different kinds of material can mitigate radius stress and improve the problem of coefficient of thermal expansion mismatches.
The purpose of this thesis is proposing an approach to model FGM structure and control feed rate of two powder feeders through DSP motion control card, that is, delivering suitable powder content in accordance with user specified FGM structure for achieving grading outcome. This thesis has two kinds of functional grading methods. Method one is to define many sub-regions to compose grading region and calculate material quantity in every sub-region to produce grading outcome. Finally, every sub-region has separate tool path planning. Compared by method one, the difference of method two is to fill with grading region by spiral path and calculate material quantity in every spiral path for meeting grading need. This method can increase grading region resolution efficiently. Before tool path planning, users have to input grading parameters in accordance with grading needs including grading region thickness, contour number (Cn) and Path Width which can control resolution.
Besides, for accomplishing automatic powder feed rate function. This thesis make use of servo motor to control feed rate of powder feeder and achieving motion control of servo motor through DSP motion control card. This thesis explain the whole and complete experiment about feed rate make feed rate can be controlled more precise.
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