Abstract
This work presents an integral system for machining fixture layout design and optimization. The optimization module of this system allows determination of optimal positions of locating and clamping elements, which provides required accuracy and surface quality, while at the same time guarantees design of collision-free fixtures. The design module performs selection of required fixture elements based on a set of predefined production rules. Adequate criteria for the selection of fixture elements are defined for locating, clamping, tool guiding, and tool adjustment elements, as well as for fixture body elements, connecting elements and add-on elements. The system uses geometry and feature workpiece characteristics, as well as the additional machining, and process planning information. It has been developed to accommodate machining processes of turning, drilling, milling, and grinding of rotational and prismatic workpieces. A segment of output results is also shown. Finally, conclusions are presented with directions for future investigation.
Highlights
Within a manufacturing system, there are several factors which most prominently influence the quality of process plans: blanks, structure of machining processes, concentration of machining operations, machine tools, cutting tools, fixtures, measuring devices, etc
By lowering the fixture design costs one can achieve significant economic effects. This can be done by applying new methods in fixture design [4]
Simplification of the design process is primarily centred on design automation, i.e., the development of CAFD (Computer Aided Fixture Design) systems
Summary
There are several factors which most prominently influence the quality of process plans: blanks, structure of machining processes, concentration of machining operations, machine tools, cutting tools, fixtures, measuring devices, etc. Vishnupriyan et al [14] optimized the fixture layout in order to minimize the machining error considering both a geometric error of locating elements and elastic deformation of a workpiece. Both of these parameters were simultaneously optimised using a GA. Such rules should enable users to select fixture elements from all functional groups - the selection of locating and clamping elements, and fixture body elements, tool guiding elements, tool aligning elements, connecting elements, and add/on elements In this way, it is possible to automatically generate a complete fixture design
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