Our Understanding for Class A surfaces:
1. The fillets - Generally for Class A, the requirement is curvature continuous and
Uniform flow of flow lines from fillet to parent surface value of 0.005 or better
(Position 0.001mm and tangency to about 0.016 degrees)
2. The flow of the highlight lines - The lines should form a uniform family of lines.
Gradually widening or narrowing but in general never pinching in and out.
3. The control points should form a very ordered structure - again varying in
Angle from one Row to the next in a gradual manner (this will yield the good
Highlights required).
4. For a Class A model the fillet boundary should be edited and moved to form a
Gentle line - and then re-matched into the base surface.
5. Matched iso-params in U & V direction are also a good representation of class A.
6. The degree (order) of the Bezier fillets should generally be about 6 (also for arc
Radius direction) sometimes you may have to go higher.
7. We also take care of Draft angle, symmetry, gaps and matching of surfaces
Created with parent or reference surfaces.
8. Curvature cross-section needles across the part - we make sure the rate of
Change of curvature (or the flow of the capping line across the top of the part) is
Very gentle and well behaved.
发表于 2003-5-23 15:02:23
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发表于 2003-5-24 21:05:12
