Enhanced Stereo Vision Using Free-Form Surface Mirrors

Abstract This study aimed to improve the efficiency of free-form surface machining by using a five-axis controlled machine tool and a barrel tool. The barrel tool has cutting edges, with curvature smaller than the radius, increasing the pick feed width compared with a conventional ball end mill of the same tool radius. As a result, the machining efficiency can be improved; however, the cost of the barrel tool is high and difficult to reground. In this study, a method to obtain the cutting points that make the cusp height below the target value is proposed. Moreover, a method to improve the tool life by continuously and uniformly changing the contact point on the cutting edge is proposed. The usefulness of the developed method is confirmed through machining simulations.

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Application of Convex Hull for Tool Interference Avoidance in 5-Axis CNC Machining

Volume 1: Design for Manufacturing Conference ◽

10.1115/96-detc/dfm-1294 ◽

1996 ◽

Author(s):

Yuan-Shin Lee ◽

Tien-Chien Chang

Keyword(s):

Convex Hull ◽

Tool Path ◽

Correction Method ◽

Nc Machining ◽

Cnc Machining ◽

Free Form ◽

Interference Avoidance ◽

Tool Interference ◽

Free Form Surface ◽

Free Form Surfaces

Abstract In this paper, a methodology of applying convex hull property in solving the tool interference problem is presented for 5-axis NC machining of free-form surfaces. Instead of exhausted point-by-point checking for possible tool interference, a quick checking can be done by using the convex hull constructed from the control polygon of free-form surface modeling. Global tool interference in 5-axis NC machining is detected using the convex hull of the free-form surface. A correction method for removing tool interference has also been developed to generate correct tool path for 5-axis NC machining. The inter-surface tool interference can be avoided by using the developed technique.

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Creation and Manipulation of Complex Displacement Features During the Conceptual Phase of Design

Volume 6: 16th Computers in Engineering Conference ◽

10.1115/96-detc/cie-1332 ◽

1996 ◽

Author(s):

P. A. van Elsas ◽

J. S. M. Vergeest

Keyword(s):

Boundary Conditions ◽

Surface Feature ◽

Free Form ◽

Shape Design ◽

Surface Model ◽

Test Results ◽

Base Surface ◽

Feature Design ◽

Data Explosion ◽

Free Form Surface

Abstract Surface feature design is not well supported by contemporary free form surface modelers. For one type of surface feature, the displacement feature, it is shown that intuitive controls can be defined for its design. A method is described that, given a surface model, allows a designer to create and manipulate displacement features. The method uses numerically stable calculations, and feedback can be obtained within tenths of a second, allowing the designer to employ the different controls with unprecedented flexibility. The algorithm does not use refinement techniques, that generally lead to data explosion. The transition geometry, connecting a base surface to a displaced region, is found explicitly. Cross-boundary smoothness is dealt with automatically, leaving the designer to concentrate on the design, instead of having to deal with mathematical boundary conditions. Early test results indicate that interactive support is possible, thus making this a useful tool for conceptual shape design.

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Alias-Based Car Free-Form Surface Design

Advances in Intelligent Systems and Computing - International Conference on Applications and Techniques in Cyber Intelligence ATCI 2019 ◽

10.1007/978-3-030-25128-4_184 ◽

2019 ◽

pp. 1501-1505

Author(s):

Yufei Huang ◽

Hegeng Wei ◽

Bo Wang

Keyword(s):

Free Form ◽

Surface Design ◽

Free Form Surface

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Characterization and Coordination of Point-line Trajectories

Journal of Mechanical Design ◽

10.1115/1.1867504 ◽

2004 ◽

Vol 127 (3) ◽

pp. 502-505 ◽

Cited By ~ 2

Author(s):

Kwun-Lon Ting ◽

Yi Zhang ◽

Ruj Bunduwongse

Keyword(s):

Orientation Relationship ◽

Complete Characterization ◽

Free Form ◽

Directed Line ◽

Free Form Surface ◽

Point Line ◽

Line Trajectory ◽

The Relationship ◽

Line Direction

A point-line refers to a rigid combination of a directed line and an endpoint along the line. To trace a point-line trajectory, one must control not only the trajectory of the endpoint (the directrix) but also the direction of the point-line (the indicatrix). This paper addresses three issues on point-line trajectories. First of all, by considering the relationship between the point trajectory and the corresponding point-line direction, it offers the complete characterization of point-line trajectories. It presents the coordination of the point-line axis with a free point trajectory and also with a point trajectory constrained on a free form surface. The issue of maintaining an invariant orientation relationship between the point-line axis and the point trajectory is also addressed.

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