The development of a new adaptive slicing algorithm for layered manufacturing system

Luo, Ren C.; Chang, Y.C.; Tzou, Jyh Hwa

doi:10.1109/robot.2001.932795

Cited by 11 publications

(8 citation statements)

References 6 publications

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“…For the continuous type, the index and layer thickness are determined by some certain geometric parameters, e.g. the volume and area, which can reflect the property of the current entire layer, not just a few sample points (Kumar and Choudhury, 2005;Luo et al, 2001;Zhao and Laperrière, 2010) [Figure 3…”

Section: Adaptive Slicingmentioning

confidence: 99%

A new two-step adaptive direct slicing approach for bio-scaffolds in tissue engineering

Liu

2017

RPJ

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Purpose This paper aims to propose the new two-step adaptive direct slicing method for building bio-scaffold with digital micro-mirror device (DMD)-based MPμSLA systems. Design/methodology/approach In this paper, the authors proposed a new approach to directly slice a scaffold’s CAD model (i.e the three-dimensional model built by computer-aided design platforms) and save the slices’ data as BMP (bitmap, i.e. the data format used in DMD) files instead of other types of two-dimensional patterns as an intermediary. The proposed two-step strategy in this paper, i.e. a CAD model’s exterior surface and internal architecture were sliced, respectively, at first, and then assembled together to obtain one intact slice. The assembly process is much easier and convenient based on the slice data in BMP format. To achieve the adaptive slicing for both the exterior part and internal part, two new indices, the exterior surface-dominated index and internal architecture-dominated index, are, respectively, utilized as the error estimation indices. The proposed approach in this paper is developed on SolidWorks platform, but it can also be implemented on other platforms. Findings The authors found that the approach is not only more accurate but also more efficient by avoiding the repeated running of those inefficient rasterization programs. The approach is able to save computer resource and time, and enhance the robustness of slicing program, as well as is appropriate for the scaffolds’ model with internal pore architecture and external free-form surface. Practical implications Bio-scaffolds in tissue engineering require precise control over material distribution, such as the porosity, connectivity, internal pore architecture and external free-form surface. The proposed two-step adaptive direct slicing approach is a good balance of slicing efficiency and accuracy and can be useful for slicing bio-scaffolds’ models. Originality/value This paper gives supports to build bio-scaffold with DMD-based MPμSLA systems.

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Section: Adaptive Slicingmentioning

confidence: 99%

A new two-step adaptive direct slicing approach for bio-scaffolds in tissue engineering

Liu

2017

RPJ

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“…The edge finding algorithm was developed to identify faces and set the corresponding allowable cusp height. Luo et al 8 used the circumference and the center of gravity of the adjacent layers to determine the different thicknesses. The formula between the thickness and the circumference deviation of the adjacent layers was proposed.…”

Section: Background and Related Workmentioning

confidence: 99%

A polygons Boolean operations-based adaptive slicing with sliced data for additive manufacturing

Lin

et al. 2016

Proceedings of the Institution of Mechanical Engineers, Part C:

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In order to increase the efficiency of additive manufacturing, this paper proposes a novel adaptive slicing approach of sliced data with minimum thickness based on Boolean operations of polygons. It can greatly handle the balance between the build time and the surface precision of additive manufacturing. The proposed adaptive slicing is available for the single solid model, the support of additive manufacturing, and simultaneously manufactured multiple models. At first, the Boolean operations of polygons are used to gain the relationship of the adjacent layers to serve as the topological information. Second, two parameters are proposed to evaluate the precision of sliced surface: the ameliorative area ratio and variation of the cusp height. Ameliorative area ratio overcomes the drawbacks of original area deviation ration criteria and can work on the large and complex models. Variation of the cusp height makes the calculation of cusp height suitable for sliced data of model, and it is independent of the normal vector of surfaces. Third, the adaptive slicing is realized by removing unnecessary layers based on two parameters and the maximum allowable thickness. The thicknesses are times of the minimum thickness. Moreover, the adaptive slicing for support of additive manufacturing is developed through dividing the support into two parts according to its height and location. Slicing of multiple models is also proposed by choosing the maximum ameliorative area ratio and variation of the cusp height among all models in the same z level as the two parameters. Finally, the adaptive slicing for the three types is tested with some special models, and corresponding models are printed with FDM technology based on slicing results of the proposed approach. Results show that the proposed adaptive slicing approach is effective.

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“…They used an edge finding algorithm to identify faces and partition facets on the part, allowing the user to specify different cusp heights for different faces. Luo et al [10] presented a new adaptive slicing method for layered manufacturing. The layer thickness was computed by comparing the contour circumference or the centre of the gravity of the contour with those of the adjacent layer.…”

Section: Adaptive Slicingmentioning

confidence: 99%

“…Furthermore, the user can reorientate the part conveniently outside the CAD system before slicing. Most adaptive slicing implementations assume a uniform maximum allowable cusp height for all the surfaces of the whole part [4,5,6,7,8,10,14]. However, most parts do not have uniform cusp height requirements (tolerance requirement of surface finish).…”

Section: Direct Slicingmentioning

confidence: 99%

Adaptive direct slicing with non-uniform cusp heights for rapid prototyping

Zhou

Yan

2004

The International Journal of Advanced Manufacturing Technology

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Adaptive slicing varies layer thickness by taking the geometry change of the CAD model in the build direction into account to improve surface finish. Direct slicing generates exact slice contours from the original CAD model and avoids an intermediate representation, known as an ''STL file''. At present, most direct slicing approaches are restricted to some CSG solids or some CAD systems. In this paper, an approach toward adaptive direct slicing with non-uniform cusp heights independent of CAD systems for rapid prototyping is presented. First the geometry model is imported into the adaptive direct slicing system from CAD systems using the standard STEP format. Using OpenGL graphics libraries, the solid model is then displayed and the user is prompted to specify the allowable cusp height for each highlighted surface. Lastly, the CAD model is sliced adaptively with different cusp heights (tolerance requirements) for different surfaces. With non-uniform cusp heights, adaptive slicing has a higher efficiency. Implementation details and results are also presented.

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The development of a new adaptive slicing algorithm for layered manufacturing system

Cited by 11 publications

References 6 publications

A new two-step adaptive direct slicing approach for bio-scaffolds in tissue engineering

A new two-step adaptive direct slicing approach for bio-scaffolds in tissue engineering

A polygons Boolean operations-based adaptive slicing with sliced data for additive manufacturing

Adaptive direct slicing with non-uniform cusp heights for rapid prototyping

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