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정영찬(Y. Chung),권성오(S. Kwon),박웅(W. Park) 한국소성가공학회 2013 금형가공 심포지엄 Vol.2013 No.9
The addendum surfaces which are designed and modeled in the metal forming simulation software tools cannot be used in the downstream processes such as machining and making the draw dies, because the simulation tools use a simple discrete mesh model for the surface geometry. The downstream processes require more precise and continuous geometric model such as NURBS surface. Generally, automotive die engineers manually re-create the geometry of addendum surfaces using the mesh model. This paper presents an automated geometric modeling process for the addendum surfaces using the mesh surface model which is generated in a metal forming simulation tool. The design parameters of the profile curve for the addendum surfaces are automatically extracted from the mesh surface. Smooth addendum surfaces are automatically generated as NURBS surfaces using the extracted design parameters. The generated surface is G1 continuous with the part surface and the binder surface.
오아영(A. Y. Oh),이유진(E. G. Yi),이채연(C. Y. Lee),권성오(S. Kwon),박웅(W. Park),정연찬(Y. Chung) 한국소성가공학회 2013 금형가공 심포지엄 Vol.2013 No.9
This paper presents a geometric analysis of section profiles for the evaluation of manufacturing quality of feature lines. A feature line is the geometry which is a visually noticeable creased line on the smooth automotive outer body panel. The quality of the feature line is important because the line is prominent and crosses over other parts. Section profiles of a feature line on a side outer panel are studied. The section profiles of the design part are computed using a CAD tool and the section profiles on a stamping part are measured using a stylus profilometer. This paper proposes geometric entities to compare the section profiles, such as chordal length and height, and fullness. The results for an example show that the chordal height difference is 0.014~0.025mm and the fullness difference is 0.133 ~ 0.207.