| Summary: | 碩士 === 正修科技大學 === 機電工程研究所 === 96 === To obtain the flexibility of choice of cutting tool and to compensate the wear of the cutting tool, this thesis presents a interference-free toolpath generating method which combines the advantages of the generating method and the sculpturing method for machining a spatial cam. The notion of the proposed method is that the cutting tool is confined within the meshing element and the motion of the cutting tool follows the meshing element so that collision problem can be avoided. To demonstrate the proposed toolpath generation, a type of spatial cam with boat shape meshing elements called spool winding cam for loom mechanism is selected.
Based on the envelope theory, homogeneous coordinate transformation and differential geometry, the cutter location using the cylindrical end mill is derived and the cutting path sequences with the minimum lead in and lead out are planned. In order to establish the interface between the design and the manufacture of spatial cam, the postprocessor for multi-axis machine tool is developed. The generated toolpath is verified before actual machining through solid cutting simulation. Then, the toolpath is converted into NC program by the postprocessor. The five-axis machine tool is used to perform the actual machining. The proposed methodology can be used to automate the programming of tool paths for four-axis machining of spatial cam.
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