scholarly journals A New Adaptive Slicing Algorithm Based on Slice Contour Reconstruction in Layered Manufacturing Process

2021 ◽  
Vol 18 (6) ◽  
pp. 1425-1447
Author(s):  
Suyun Liu ◽  
Ajay Joneja ◽  
Kai Tang
Keyword(s):  
Manufacturing Process ◽  
Layered Manufacturing ◽  
Adaptive Slicing ◽  
Contour Reconstruction

Adaptive Slicing for a Multi-Axis Laser Aided Manufacturing Process

2004 ◽  
Vol 126 (2) ◽  
pp. 254-261 ◽  
Author(s):  
Jun Zhang ◽  
Frank Liou
Keyword(s):  
Surface Tension ◽  
Path Planning ◽  
Manufacturing Process ◽  
Side Surface ◽  
Layered Manufacturing ◽  
University Of Missouri ◽  
Adaptive Slicing ◽  
Automated Method ◽  
The University ◽  
Five Axis

An adaptive slicing algorithm which can generate optimal slices to achieve deposition without support structures for five-axis hybrid layered manufacturing is presented in this paper. Different from current adaptive slicing, this technique varies not only in layer thickness but also in slicing direction. The Laser Aided Manufacturing Process (LAMP), a five axis system combined material additive and removal process which was developed at the University of Missouri-Rolla, is used as an example. The multiple-degree-of-freedom system allows LAMP to build a part with minimum support structure. However, an automated method for path planning of such a system is necessary. Two techniques have been adapted to build the overhang between two adjacent layers: transition wall and surface tension. This paper addresses the critical slicing algorithm based on the above two techniques. The slicing direction is determined by a marching algorithm which is based on the surface normals of points on the side surface of the current slice.

Optimal space filling for additive manufacturing

2016 ◽  
Vol 22 (4) ◽  
pp. 660-675 ◽  
Author(s):  
Sajan Kapil ◽  
Prathamesh Joshi ◽  
Hari Vithasth Yagani ◽  
Dhirendra Rana ◽  
Pravin Milind Kulkarni ◽  
...  
Keyword(s):  
Additive Manufacturing ◽  
Manufacturing Process ◽  
Layered Manufacturing ◽  
Closed Curve ◽  
Numerical Control ◽  
Surface Finishing ◽  
Content Type ◽  
Single Pass ◽  
Connected Area ◽  
Area Filling

Purpose In additive manufacturing (AM) process, the physical properties of the products made by fractal toolpaths are better as compared to those made by conventional toolpaths. Also, it is desirable to minimize the number of tool retractions. The purpose of this study is to describe three different methods to generate fractal-based computer numerical control (CNC) toolpath for area filling of a closed curve with minimum or zero tool retractions. Design/methodology/approach This work describes three different methods to generate fractal-based CNC toolpath for area filling of a closed curve with minimum or zero tool retractions. In the first method, a large fractal square is placed over the outer boundary and then rest of the unwanted curve is trimmed out. To reduce the number of retractions, ends of the trimmed toolpath are connected in such a way that overlapping within the existing toolpath is avoided. In the second method, the trimming of the fractal is similar to the first method but the ends of trimmed toolpath are connected such that the overlapping is found at the boundaries only. The toolpath in the third method is a combination of fractal and zigzag curves. This toolpath is capable of filling a given connected area in a single pass without any tool retraction and toolpath overlap within a tolerance value equal to stepover of the toolpath. Findings The generated toolpath has several applications in AM and constant Z-height surface finishing. Experiments have been performed to verify the toolpath by depositing material by hybrid layered manufacturing process. Research limitations/implications Third toolpath method is suitable for the hybrid layered manufacturing process only because the toolpath overlapping tolerance may not be enough for other AM processes. Originality/value Development of a CNC toolpath for AM specifically hybrid layered manufacturing which can completely fill any arbitrary connected area in single pass while maintaining a constant stepover.

Build strategies for rapid manufacturing of components of varying complexity

2015 ◽  
Vol 21 (3) ◽  
pp. 340-350 ◽  
Author(s):  
Suryakumar Simhambhatla ◽  
K.P. Karunakaran
Keyword(s):  
Manufacturing Process ◽  
Design Methodology ◽  
Layered Manufacturing ◽  
Rapid Manufacturing ◽  
Geometric Complexity ◽  
Content Type ◽  
Material Deposition ◽  
Fixed Axis ◽  
Deposition Processes ◽  
Deposition Direction

Purpose – This paper aims to develop build strategies for rapid manufacturing of components of varying complexity with the help of illustration. Design/methodology/approach – The build strategies are developed using a hybrid layered manufacturing (HLM) setup. HLM, an automatic layered manufacturing process for metallic objects, combines the best features of two well-known and economical processes, viz., arc weld-deposition and milling. Depending on the geometric complexity of the object, the deposition and/or finish machining may involve fixed (3-axis) or variable axis (5-axis) kinematics. Findings – Fixed axis (3-axis) kinematics is sufficient to produce components free of undercuts and overhanging features. Manufacture of components with undercuts can be categorized into three methods, viz., those that exploit the inherent overhanging ability, those that involve blinding of the undercuts in the material deposition stage and those that involve variable axis kinematics for aligning the overhang with the deposition direction. Research limitations/implications – Although developed using the HLM setup, these generic concepts can be used in a variety of metal deposition processes. Originality/value – This paper describes the methodology for realizing undercut features of varying complexity and also chalks out the procedure for their manufacture with the help of case studies for each approach.

Adaptive Slicing of Heterogeneous Solid Models for Layered Manufacturing

1998 ◽  
Author(s):  
Vinod Kumar ◽  
Prashant Kulkarni ◽  
Debasish Dutta
Keyword(s):  
Process Planning ◽  
Layered Manufacturing ◽  
Functionally Graded ◽  
Adaptive Slicing ◽  
Heterogeneous Objects ◽  
Solid Models ◽  
Fundamental Process ◽  
Planning Task ◽  
Material Information ◽  
Heterogeneous Solid

Abstract A novel feature of Layered Manufacturing, an emerging manufacturing technology, is that it enables fabrication of heterogeneous objects (multi-material and functionally graded interiors). In our earlier work, we developed new modeling schemes (called heterogeneous solid models) for representing these heterogeneous objects by capturing both geometry and material information. One of the crucial steps for fabricating these heterogeneous objects in LM is adaptive slicing, a fundamental process planning task. In this paper, we describe how the heterogeneous solid models can be adaptively sliced to aid in the LM fabrication of heterogeneous objects.

Pre-Processing of Heterogeneous Objects for Layered Manufacturing

2001 ◽  
Author(s):  
Ki-Hoon Shin ◽  
Debasish Dutta
Keyword(s):  
Tool Path ◽  
New Technology ◽  
Three Dimensional ◽  
Layered Manufacturing ◽  
Pattern Generation ◽  
Geometric Features ◽  
Adaptive Slicing ◽  
Heterogeneous Objects ◽  
Build Time ◽  
Material Information

Abstract Layered manufacturing (LM) is emerging as a new technology that enables fabrication of three dimensional heterogeneous objects (such as Multi-materials and Functionally Gradient Materials). The steps for fabricating heterogeneous objects include model representation and material process planning. This paper introduces a method for processing the material information. It includes pre-processing (discretization), orientation (build direction selection), and adaptive slicing of heterogeneous objects. The discretization process converts all material information inside a heterogeneous object to material features like geometric features, thus it makes it possible to determine build direction by estimating build time based on geometric features and material features. It also allows adaptive slicing of heterogeneous objects to minimize surface finish and material resolution error. In addition, tool path planning can be simplified to fill pattern generation. Examples are shown.

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