A new method for classification and parametric representation of freeform surface feature

Feature modelling is a valuable technology to define and manipulate product models through advanced operations. Parameters and constraints can be included in feature models to represent particular design intent. In this way, entire families of shapes, not just specific instances, can be modelled. Freeform surface feature modelling, which extends the concept of feature modelling to freeform shapes, still suffers from a number of shortcomings as regards parametric modelling. In particular, it lacks good facilities to add new parameters to a model. We present a multi-level freeform surface feature model that can be used to implement such facilities. The model contains an unevaluated, a partially evaluated and an evaluated level. The paper describes the three levels and how these are generated.

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Numeric and curve parameters for freeform surface feature models

Computer-Aided Design ◽

10.1016/j.cad.2008.03.003 ◽

2008 ◽

Vol 40 (8) ◽

pp. 839-851 ◽

Cited By ~ 18

Author(s):

Paulos J. Nyirenda ◽

Willem F. Bronsvoort

Keyword(s):

Surface Feature ◽

Freeform Surface ◽

Feature Models

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Trajectory Generation for Glazing Spray Gun Based on STL Model

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.487.617 ◽

2014 ◽

Vol 487 ◽

pp. 617-620

Author(s):

Hai Peng Pan ◽

Hao Feng ◽

Li Gang Cao

Keyword(s):

Ceramic Industry ◽

Trajectory Generation ◽

New Method ◽

Freeform Surface ◽

Ceramic Product ◽

Manual Work ◽

Stl Model ◽

Product Surface ◽

Spray Gun

Glazing is a key procedure in ceramic product surface decorating processing. Recently, robots are gradually utilized to fulfill the glazing work instead of manual work. However, the researches on freeform surface glazing technology lag behind the research on robotics technology, thus limits the application of glazing robot in ceramic industry. In order to improve the quality and efficiency of robot glazing, this paper presents a new method which is base on STL model to generate trajectory for glazing spray gun. The whole procedures of this method have been discussed explicitly.

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Research on the 5-axis Machining of Blisk

Materials Science Forum ◽

10.4028/www.scientific.net/msf.532-533.612 ◽

2006 ◽

Vol 532-533 ◽

pp. 612-615 ◽

Cited By ~ 1

Author(s):

Chuang Guo Hu ◽

Ding Hua Zhang ◽

Jun Xue Ren ◽

Lei Yang

Keyword(s):

Residual Stresses ◽

Double Point ◽

New Method ◽

Freeform Surface ◽

Boundary Contour ◽

Tool Paths ◽

Tool Axis ◽

Part Distortion ◽

Thin Walled ◽

Axis Drive

The study presents a new method for 5-axis machining of blisk, which consists of both roughing tunnels and finishing blades. The ruled surface is used to approximate the freeform surface of blade, and the boundary contour of the tunnel is then determined. Based on the double point offset method, the 5-axis tool paths for roughing blisk tunnel region are generated. Similarly, by linking the corresponding points on the tool center curves and the tool axis drive curves, the spiral tool paths are developed to finish milling thin-walled blades taking into account the residual stresses induced part distortion during machining. This strategy is experimentally verified.

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A framework for extendable freeform surface feature modelling

Computers in Industry ◽

10.1016/j.compind.2008.09.008 ◽

2009 ◽

Vol 60 (1) ◽

pp. 35-47 ◽

Cited By ~ 7

Author(s):

Paulos J. Nyirenda ◽

Willem F. Bronsvoort

Keyword(s):

Surface Feature ◽

Freeform Surface ◽

Feature Modelling

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Definition of Freeform Surface Feature Classes

Computer-Aided Design and Applications ◽

10.1080/16864360.2006.10738420 ◽

2006 ◽

Vol 3 (5) ◽

pp. 665-674 ◽

Cited By ~ 11

Author(s):

Paulos J. Nyirenda ◽

Madhuwanti Mulbagal ◽

Willem F. Bronsvoort

Keyword(s):

Surface Feature ◽

Freeform Surface ◽

Definition Of

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Selective Sampling and Orientation of Non-Homogeneous Tissues

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100100238 ◽

1968 ◽

Vol 26 ◽

pp. 98-99

Author(s):

C. C. Clawson ◽

L. W. Anderson ◽

R. A. Good

Keyword(s):

Electron Microscopy ◽

Electron Microscope ◽

Light Microscopy ◽

Random Sampling ◽

New Method ◽

Microscope Examination ◽

Small Areas ◽

Selective Sampling ◽

Large Numbers ◽

Specific Orientation

Investigations which require electron microscope examination of a few specific areas of non-homogeneous tissues make random sampling of small blocks an inefficient and unrewarding procedure. Therefore, several investigators have devised methods which allow obtaining sample blocks for electron microscopy from region of tissue previously identified by light microscopy of present here techniques which make possible: 1) sampling tissue for electron microscopy from selected areas previously identified by light microscopy of relatively large pieces of tissue; 2) dehydration and embedding large numbers of individually identified blocks while keeping each one separate; 3) a new method of maintaining specific orientation of blocks during embedding; 4) special light microscopic staining or fluorescent procedures and electron microscopy on immediately adjacent small areas of tissue.

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