Sculptured surfaces in engineering and medicine. A Machining Method of Sculptured Surface Based on the Quad 2019-03-12

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CAD

sculptured surfaces in engineering and medicine

. This paper discusses how local measurements of three-dimensional positions and surface normals recorded by a set of tactile sensors, or by three-dimensional range sensors , may be used to identify and locate objects, from among a set of known objects. The control process of manufactured products can take relevant advantage of such technology. The 3-D scanner is a non-contact tool to measure the 3-D shape of laser deposition cladding which is fast and accurate. Dedicated procedures and algorithms can allow to automatically evaluating the designer specifications comparing the two data model.

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Reverse engineering of composite sculptured surfaces

sculptured surfaces in engineering and medicine

Tool path regeneration for mold modification. A tool-path generation algorithm using taper-cuter is proposed in this article. In sculptured surface modeling, complex contours are represented as a network of patches, each expressed in terms of known points, vectors, and curves. A strategy for finish cutting path generation of compound surfaces. It features in that a novel dynamic weighting strategy is introduced in the iterative optimization process to make the localization in favor of the surfaces with higher quality requirements. Further, complex shapes formed by performing Boolean operations on geometrical primitives are beyond the scope of this paper. However, as the modern manufacturing trend is towards producing low-volume, high-variety, high-complexity, and large products, current inspection techniques show difficulties in coping with this.

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Advanced Path Generator for Sculptured Surface Machining

sculptured surfaces in engineering and medicine

In this paper, the issues involved in the machining of sculptured surfaces are investigated, with an aim to improve machining time and surface finish. In this study, complex shapes are defined as the sculptured surfaces created by the blending of curves, to form surface patches. Results are presented on real objec t s. Precision inspection has been widely used in manufacturing to measure the dimensional accuracy of parts and products to meet the quality requirements. Although significant progress has been made in precision machining of freeform surfaces, inspection of such surfaces remains a difficult problem. The technique consists of two major steps: localization of measurement data to the design system, based on the datum reference information; and further localization based on the information from free-form surfaces.

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CAD

sculptured surfaces in engineering and medicine

Such parts may likewise undergo large deformations depending on their space orientation. The method deforms the mesh in such a manner so as to ensure its smoothness. The robust method makes it possible to machine any compound sculptured surfaces regardless of their complexity. Then the surface points are calculated from the localized measured data and surface normal vectors of the offset surface. In order to achieve constant load on the cutting tool during the machining of sculptured surfaces, the issue of feedrate optimisation based on force prediction models has not captured enough attention. Machining of Complex Sculptured Surfaces considers new approaches to the manufacture of moulds and dies within these industries.

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(PDF) A Study on Machining of Sculptured Surfaces

sculptured surfaces in engineering and medicine

The algorithm provides a highly effective solution for handling many complex industrial parts. Implementation and tests of inspection samples have been carried out to verify the developed inspection techniques. Experimental results show the capabilities of the registration on unfolding surface and curved surface. It thereby allows the optimized press works in ship-hull forming. Constant scallop-height machining of free-form surfaces. Only a reduced number of models applying ball-end mills have been developed. The cutting forces were calculated by using the cutter contact area determined from the Z-map of the surface geometry and the current cutter location.

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Advanced Path Generator for Sculptured Surface Machining

sculptured surfaces in engineering and medicine

When a mould design is changed, tool paths that cover the modified region must be regenerated. A computation engine calculates the measurement paths and performs the tolerances verification. The sample points could distribute well according to the surface appearance characteristics, and the distribution of sample points under the required planning accuracy can be found via iteration. Abstract: In this paper, modal analysis of ball end mills is modeled by finite element to work out natural frequency and chatter model in tooling system and to calculate the limit curve of stability in single degree freedom system. Computational efficiency, machining efficiency, and quality are considered in this integrated method. In totality, this tends to increase customer satisfaction as a final goal of the developed system. The obtained results from the study show that it is possible to target high surface finish and low machining time while maintaining constant cutting forces.

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CAD

sculptured surfaces in engineering and medicine

Once such surfaces are manufactured, surface inspection compares the manufactured surfaces with the surface design specifications to verify conformance. With the increasing and extensive application of free-form surfaces in many fields, the inspection of manufactured free-form surfaces has become all the more important. For determining the design coordinate system, a sensitivity measure is proposed and confirmed experimentally. Results indicate that significant productivity gains can be realized using the feedrate optimization techniques. The examples are included to illustrate the systems and the methods. In this paper, a new optimization method is proposed for non-rigid shape matching modeling and solving.

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Machining of Complex Sculptured Surfaces

sculptured surfaces in engineering and medicine

Apparently, the curved surface and the unfolded-flat surface are expressed by different coordinate systems. By integrating the process along each cutting edge, which is in contact with the workpiece, the cutting forces, vibrations, dimensional surface finish and chatter stability lobes for an arbitrary end mill can be predicted. They allow comparing the toleranced features with the corresponding parts of point clouds. Please refer to the American Society of Mechanical Engineers' Privacy Policy for further information. Multi-press forming imposes the forced displacements on the flat plate by controlling the position of each pressing points based upon the shape difference between the unfolded flat plate and the curved object shape. Increasing requirements for the accuracy of freeform surfaces have led to significant challenges for the manufacturing of these surfaces. Experimental results showed high performances in terms of timesaving and robustness.

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