An approximate method for generating draft on a free-form surface

Tokuyama, Yoshimasa; Bae, Seockhoon

doi:10.1007/s003710050158

Cited by 12 publications

(8 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Given surface S(u, v), the set of points on S(u, v) that presents a certain, fixed, angle between the normal of S(u, v) and some viewing direction, V, is denoted the isoclines [12] of S(u, v) from V. Typically, the isoclines are univariate functions or curves, C(t) =…”

Section: Fig 1 Highlight Curves (In Gray)mentioning

confidence: 99%

See 1 more Smart Citation

Curve Evaluation and Interrogation on Surfaces

Elber

2001

Graphical Models

View full text Add to dashboard Cite

Section: Fig 1 Highlight Curves (In Gray)mentioning

confidence: 99%

“…In [12], the problem of detecting steep regions in the design of injection molds is portrayed. A solution that is based on the detection of seed points on the isocline curves, followed by a numerical surface marching process, is also suggested.…”

Section: Introductionmentioning

confidence: 99%

Curve Evaluation and Interrogation on Surfaces

Elber

2001

Graphical Models

View full text Add to dashboard Cite

“…Regarding product demolding design, Tokuyama et al [2] used the B-Spline curve and surface to determine the draft effect of a free-form surface. Yan et al [3] proposed making a draft angle on a composite surface, which was added to the composite surface with a fillet by the translation of a surface control point.…”

Section: Introductionmentioning

confidence: 99%

Automatic Recognition and Construction of Draft Angle for Injection Mold Design

Jong¹,

Li²,

Chen³

et al. 2017

JSEA

View full text Add to dashboard Cite

In the injection molding process, plastic products are difficult to demold due to friction force between the cavity and products, thus, finished products might be deformed or damaged. Therefore, designers should add a draft angle to the geometric surface of products, which is parallel to the unloading direction, in order to help the products eject smoothly from the cavity. This study uses CAD software as the main architecture to develop the function of automatic draft angle recognition and construction. The study is divided into three stages. First, the geometric features of products are identified in the CAD model by induced algorithm, then the quilts to be added in the draft design are determined and classified. Finally, draft angles are created in different ways according to different surfaces. An algorithm suitable for automatic draft recognition and construction, as well as the constraints of automatic creation of draft angle, is proposed. The feature recognition algorithm of this study can automatically inspect 90% of the surfaces to be drafted, and the automatic creation of draft features can economize 80% of required mouse clicks, thus, effectively increasing draft angle design efficiency, and preventing errors in mold design and manufacturing.

show abstract

“…Unfortunately there are not many publications addressing this issue. Tokuyama and Bae [8] attempted using isocline curves and isocline surfaces. They first find an isocline curve on a free-form surface and then generate an isocline surface, which is essentially a ruled surface between the isocline surface and the intersection line in the draft direction on the parting surface.…”

Section: Introductionmentioning

confidence: 99%

“…The approach in this paper differs from both [8] and [9] in that the B-spline surface is modified to satisfy the draft condition. No additional surfaces or curves are added.…”

Section: Introductionmentioning

confidence: 99%

An Algorithm for Adding Draft Angle to B-spline Surfaces

Schreve¹

2008

Computer-Aided Design and Applications

View full text Add to dashboard Cite

An algorithm for adding draft angles to B-spline surfaces is described. The algorithm modifies the control net of the surface in order to satisfy the draft angle conditions. The draft angle conditions are based on simple vector products performed on the quadrilaterals of the control net. The algorithm minimizes the total displacement of the control points in such a way that the draft angle conditions will be satisfied everywhere on the surface. The algorithm is demonstrated with some examples.

show abstract

An approximate method for generating draft on a free-form surface

Cited by 12 publications

References 5 publications

Curve Evaluation and Interrogation on Surfaces

Curve Evaluation and Interrogation on Surfaces

Automatic Recognition and Construction of Draft Angle for Injection Mold Design

An Algorithm for Adding Draft Angle to B-spline Surfaces

Contact Info

Product

Resources

About