Accessibility Driven Spatial Partitioning for Generating Sacrificial Multi-Piece Molds

2002 ◽  
Author(s):  
Jun Huang ◽  
Satyandra K. Gupta
Keyword(s):  
Mold Design ◽  
Cad Model ◽  
Complex Objects ◽  
Spatial Partitioning ◽  
Functional Part ◽  
Drilling Operations ◽  
Geometrically Complex ◽  
Manufacturing Environments ◽  
Part Model ◽  
Design Steps

This paper describes an algorithm based on accessibility-driven partitioning approach to the design of sacrificial multi-piece molds. We construct gross shape of the mold by subtracting the part model from the mold enclosure and analyze its accessibility. The gross mold shape is partitioned using accessibility information. Each partitioning improves accessibility and we produce a set of mold components that are accessible and therefore can be produced using milling and drilling operations. Our approach has the following advantages. First, by using multi-piece molds we can create geometrically complex objects that are impossible to create using traditional two-piece molds. Second, we make use of sacrificial molds. Therefore, using multi-piece sacrificial molds, we can create parts that pose disassembly problems for permanent molds. Third, mold design steps are significantly automated in our methodology. Therefore, we can create the functional part from the CAD model of the part in a matter of hours and so our approach can be used in small batch manufacturing environments.

Towards Automated Design of Multi-Piece Permanent Molds

2003 ◽  
Author(s):  
Satyandra K. Gupta ◽  
Alok K. Priyadarshi
Keyword(s):  
Automated Design ◽  
Geometric Algorithms ◽  
Mold Design ◽  
Software System ◽  
Design Algorithm ◽  
Accessibility Analysis ◽  
Ideal Candidate ◽  
Complex Parts ◽  
Design Steps

Multi-Piece molds, which consist of more than two mold pieces, are capable of producing very complex parts—parts that cannot be produced by the traditional molds. The tooling cost is also low for multi-piece molds, which makes it an ideal candidate for pre-production prototyping and bridge tooling. However, designing multi-piece molds is a time-consuming task. This paper describes geometric algorithms for automated design of multi-piece molds. A Multi-Piece Mold Design Algorithm (MPMDA) has been developed to automate several important mold-design steps: finding parting directions, locating parting lines, creating parting surfaces, and constructing mold pieces. MPMDA constructs mold pieces based on global accessibility analysis results of the part and therefore guarantees the disassembly of the mold pieces. A software system has also been developed and successfully tested on several complex industrial parts.

NON-DISCRETIZED APPROACH TO VISIBILITY ANALYSIS FOR AUTOMATIC MOLD FEATURE RECOGNITION USING STEP PART MODEL

2012 ◽  
Vol 11 (01) ◽  
pp. 1-16 ◽  
Author(s):  
ANKIT SURTI ◽  
N. V. REDDY
Keyword(s):  
Feature Recognition ◽  
Mold Design ◽  
Visibility Analysis ◽  
Input And Output ◽  
Parting Direction ◽  
Part Model

Undercut feature recognition in automatic mold design requires analyzing the visibility/accessibility of the part along a known parting direction, the existing approaches for which are mostly restricted to polyhedral parts or a particular CAD platform or cannot handle partially accessible faces very well. The present work proposes a projection-based methodology to analyze the visibility of a part from a given parting direction without discretizing the part. An approach to further extract undercut features and generate corresponding side-cores is also presented. The implemented system uses STEP AP214/AP203 part files for input and output and has been successfully validated using parts geometrically similar to those used in literature as well as on a number of industrial parts of greater complexity.

scholarly journals Method of the Analysis of Materials’ Microstructure Based on the Fractal Analysis of Images

2021 ◽  
Author(s):  
Konstantin Makarenko ◽  
Ekaterina Zentsova
Keyword(s):  
Cast Iron ◽  
Fractal Analysis ◽  
Analysis Method ◽  
Complex Objects ◽  
Graphite Phase ◽  
Topological Parameters ◽  
Modern Computer ◽  
Wide Range ◽  
Geometrically Complex ◽  
Graphite Inclusions

The basics of metallography and modern systems used to study and analyse the structures of materials are presented. Special attention is paid to the methods of quantitative microscopy. The review of modern computer programs for analysis of image microstructures obtained from digital microscopes is given. The fundamentals of fractal analysis as a highly effective tool for calculating numerical values of parameters of geometrically complex objects are described. The analysis of the graphitized cast iron structure is provided as an example; the application of the fractal analysis method for determining such characteristics of the graphite phase as the shape of graphite inclusions and their distribution in the amount of the alloy is demonstrated. In the course of the research, different classes of cast iron have been studied. To determine the shape of graphite inclusions it was suggested to use fractal dimension. The nonuniformity of the distribution was estimated by such function as lacunarity. The separate stages of determining these characteristics with a specialized FracLac plugin within the ImageJ program are presented. The results obtained have shown high adequacy. In spite of positive assessments, there are shortcomings revealed in the course of the research on the application of fractal analysis methods for identifying geometrically complex dimensional and topological parameters of the graphite phase in cast iron. The ways to further improve these methods in order to solve a wide range of problems in metallography of alloys are suggested.

DETERMINATION OF THE DIMENSIONAL AND TOPOLOGICAL PARAMETERS OF THE GRAPHITE PHASE IN CAST IRON BY FRACTAL ANALYSIS OF IMAGES OF ITS MICROSTRUCTURE

2021 ◽  
Vol 2021 (9) ◽  
pp. 4-14
Author(s):  
Konstantin Makarenko ◽  
Anatoliy Poddubnyy ◽  
Sergey Glushenok ◽  
Ekaterina Zencova
Keyword(s):  
Cast Iron ◽  
Fractal Analysis ◽  
Spheroidal Graphite ◽  
Complex Objects ◽  
Graphite Phase ◽  
Topological Parameters ◽  
Modern Computer ◽  
Wide Range ◽  
Geometrically Complex ◽  
Graphite Inclusions

The basics of metallography and modern systems used for studying and analyzing the structures of materials are described. Special attention is paid to the techniques of quantitative microscopy, as a kind of ancestress of modern microstructure analysis systems. The analysis of modern computer programs used to analyze images of microstructures obtained from digital microscopes is presented. The basics of fractal analysis as a highly effective tool for calculating numerical values of parameters of geometrically complex objects are outlined. Using the example of the analysis of graphitized cast iron structure, the application of the fractal analysis method to determine such characteristics of the graphite phase as the shape of graphite inclusions and their distribution in the alloy volume is demonstrated. As part of the study, various classes of cast iron have been studied, such as graphitic pig iron with flaked graphite, cast iron with vermicular graphite, and high-grade cast iron with spheroidal graphite. To determine the shape of graphite inclusions, a fractal dimension has been proposed to be used, and the unevenness of the distribution has been estimated using such a function as lacunarity. The individual stages of determining these characteristics using a specialized FracLac module applied in the structure of the ImageJ program are presented. The obtained results showed high adequacy. Despite positive assessment, the shortcomings identified during the research on the use of fractal analysis methods for identifying geometrically complex dimensional and topological parameters inherent in the graphite phase in cast iron are noted. The ways for further improvement of these methods for solving a wide range of problems in metallography of alloys are proposed.

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