Selection of Optimal Machining Strategy in the Manufacture of Elements Bounded by Curvilinear Surfaces

Czerech, Ł.

doi:10.2478/ama-2013-0001

Cited by 4 publications

(3 citation statements)

References 12 publications

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“…Besides dimensional accuracy, the quality of the machined surface is major importance. Surface quality is governed by numerous factors, including machine tool stiffness, cutting tool type, workpiece clamping method, and cutting conditions [5,6].…”

Section: Testing -Impact Of Constant Cutting Speed On Finished Surfac...mentioning

confidence: 99%

The Influence of Finishing Strategy on the Quality of Surface

Hnátík

Kroft

Bicova

2018

MSF

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The present contribution focuses on finishing operations in machining. Finishing operations belong to the most time-consuming and surface quality-critical machining tasks. High-quality tools are available nowadays for choosing optimal tool paths for finishing. Yet, the finishing options for general shaped surfaces are still severely limited. Although CAM systems can efficiently generate tool paths, none of them offers the combination of finishing tool paths, modern productive methods and adaptive tool paths. Increasing the productivity while maintaining dimensional accuracy and the quality of finished surfaces is the key point in finishing. One of the ways to improving productivity is the use of constant cutting speed. The aim of this article is to present experimental verification of these assumptions and demonstrate the impact on the quality of the finished surface

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Section: Testing -Impact Of Constant Cutting Speed On Finished Surfac...mentioning

confidence: 99%

The Influence of Finishing Strategy on the Quality of Surface

Hnátík

Kroft

Bicova

2018

MSF

View full text Add to dashboard Cite

show abstract

“…Compared to similar work in 3D printing and tool path planning, ring pass selection is similar to machining spiral strategy [24] but differs by GPU simulation for path planning of selected ring set cover of model in software visualization. The number of ring distribution and ring cover set is selected based on the step over distance of path patterns users prefer.…”

Section: Ring Path Planning and System Scopementioning

confidence: 99%

Step Ring-Based Three-Dimensional Path Planning Via Graphics Processing Unit Simulation for Subtractive Three-Dimensional Printing

Tucker

Nath

et al. 2016

Journal of Manufacturing Science and Engineering

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In this paper, both software model visualization with path simulation and associated machining product are produced based on the step ring-based three-axis path planning to demo model-driven graphics processing unit (GPU) feature in tool path planning and 3D image model classification by GPU simulation. Subtractive 3D printing (i.e., 3D machining) is represented as integration between 3D printing modeling and computer numerical control (CNC) machining via GPU simulated software. Path planning is applied through visualization of surface material removal in high-resolution and 3D path simulation via ring selective path planning based on accessibility of path through pattern selection. First, the step ring selects critical features to reconstruct computer-aided design (CAD) design model as stereolithography (STL) voxel, and then, local optimization is attained within interested ring area for time and energy saving of GPU volume generation as compared to global automatic path planning with longer latency. The reconstructed CAD model comes from an original sample (GATech buzz) with 2D image information. CAD model for optimization and validation is adopted to sustain manufacturing reproduction based on system simulation feedback. To avoid collision with the produced path from retraction path, we pick adaptive ring path generation and prediction in each planning iteration, which may also minimize material removal. Moreover, we did partition analysis and G-code optimization for large-scale model and high density volume data. Image classification and grid analysis based on adaptive 3D tree depth are proposed for multilevel set partition of the model to define no cutting zones. After that, accessibility map is computed based on accessibility space for rotational angular space of path orientation to compare step ring-based pass planning verses global path planning of all geometries. Feature analysis via central processing unit (CPU) or GPU processor for GPU map computation contributes to high-performance computing and cloud computing potential through parallel computing application of subtractive 3D printing in the future.

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“…The techniques also have applications beyond inflatable structures-any non-uniform tubular substrate can be printed on, and this has great potential in bio-fabrication and bio-plotting applications, 12 along with printed electronics in robotics and structural monitoring. 13 In additive manufacturing, it is necessary to maintain a strict constant velocity of the print nozzle over the substrate surface (this is in contrast to subtractive manufacturing techniques, where four-axis CNC milling is common [14][15][16] ). If the substrate is a constant radius cylinder, this is straightforward to achieve.…”

Section: Introductionmentioning

confidence: 99%

Production Techniques for 3D Printed Inflatable Elastomer Structures: Part II—Four-Axis Direct Ink Writing on Irregular Double-Curved and Inflatable Surfaces

Coulter

Papastavrou

et al. 2018

3D Printing and Additive Manufacturing

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This article is the second in a two-part series describing a process for conformal 3D printing onto inflated substrates. The article describes the design and build of a custom-built four-axis 3D printer with the ability to measure the shape of any uneven substrate, and to then accurately extrude a thixotropic silicone onto the substrate by using Direct Ink Writing techniques. Details of strategies for 3D scanning a double-curved tubular inflated substrate using an industrial triangulation laser measurement device are given. Methods to import scan data and create a digital representation of the surface within the parametric design software Grasshopper 3D are explained. Geodesic print paths are created over the surface of the computed substrate, and these are the basis for calculating 3D printer toolpaths. A constant surface linear velocity strategy is developed, allowing the printer to move the print nozzle at a varying speed over the substrate surface. The change in speed is correlated with changes in the surface linear velocity of a fourth axis rotation of the variable radius balloon substrate. This ensures that the extruded bead maintains a constant thickness, even while using a constant flow rate deposition. The process is achieved by adapting cartographic techniques to re-project to the desired print paths. The efficacy of this technique is analyzed by 3D scanning a printed patterned balloon, then measuring and comparing multiple cross-sections of the extruded beading.

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Selection of Optimal Machining Strategy in the Manufacture of Elements Bounded by Curvilinear Surfaces

Cited by 4 publications

References 12 publications

The Influence of Finishing Strategy on the Quality of Surface

The Influence of Finishing Strategy on the Quality of Surface

Step Ring-Based Three-Dimensional Path Planning Via Graphics Processing Unit Simulation for Subtractive Three-Dimensional Printing

Production Techniques for 3D Printed Inflatable Elastomer Structures: Part II—Four-Axis Direct Ink Writing on Irregular Double-Curved and Inflatable Surfaces

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