| Budget Amount *help |
¥4,000,000 (Direct Cost: ¥4,000,000)
Fiscal Year 1987: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1986: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 1985: ¥2,500,000 (Direct Cost: ¥2,500,000)
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| Research Abstract |
A geometric modelling system which enabled a decstiption of the formed surfaces with high accuracy, was developed in this research, In order to realize accurate descriptions of three dimenensionally curved surfaces, two desciription methods in the form of the APT-like language and poin data which indicated positional vectors on the curved surface were newly developed and used togrehter in thes modelling system.
A fundamental of a geometric modelling, that is, shape description of curved surfaces, in this system is to desctibe a required curved surface as an envelope surface being dfoemed with crose sectional profiles of an original shape. That is, for dectibing these cross sectional prodiles, these two desctiption methods mentioned above were developed.
As for the method in the form of the APT-like language desciription, cross sectional profiles are described with a line, a circular arc and spline. A sweep surface can also be fefined with these analytical modelling segments. As for the m
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ethod in thr form of point data, on thr other hand, the dicubically blended Coons patches are adopted. In order to acquire positional vectors which construct noal points of Conns patches, a mouse device is widely used in this syste. the wide use of the mouse device results in a quick and easy operation fo point data acquition of this meodlling system. In this system, furthrmore, the point data acquisiting operation with the mouse device is highly precised by using several types og grid patterns with adequate dimensions displayed on he input area of a graphic screen.
An NC cutter pathe generation system is also mase possible for machining a simply shaped object which is desctibed in the modelling system. However, with the lack of cutter collision check ability, this cutter path generation system is not fully operated for machining the object with more compicated curved surfaces.
The newly developed modelling system is considered to become a meaningful tool for a CAD/CAM system of moulds which are respected to be more widely used for a mass production system. Less
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