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.

scholarly journals A Feature-Based Approach to Automated Design of Multi-Piece Sacrificial Molds

2001 ◽  
Vol 1 (3) ◽  
pp. 225-234 ◽  
Author(s):  
S. Dhaliwal ◽  
S. K. Gupta ◽  
J. Huang ◽  
M. Kumar
Keyword(s):  
Degrees Of Freedom ◽  
End Milling ◽  
Automated Design ◽  
Cnc Machining ◽  
Mold Design ◽  
Design Algorithm ◽  
Part Geometry ◽  
Assembly Features ◽  
Feature Based ◽  
Milling Tools

This paper describes a feature-based algorithm for automated design of multi-piece sacrificial molds. Our mold design algorithm consists of the following three steps. First, the desired gross mold shape is created based on the feature-based description of the part geometry. Second, if the desired gross mold shape is not machinable as a single component, then the gross mold shape is decomposed into simpler geometric components to make sure that each component is machinable using 3-axis CNC machining. The decomposition is performed to ensure that each component is accessible to end-milling tools, and decomposed components can be assembled together to form the gross mold shape. Finally, assembly features are added to mold components to eliminate unnecessary degrees of freedom from the final mold assembly to facilitate molding.

scholarly journals Development of an Automated Design Algorithm for the Longitudinal Members of Oil Tankers based on H-CSR

2016 ◽  
Vol 53 (6) ◽  
pp. 503-513
Author(s):  
Chan-im Park ◽  
Sol Jeong ◽  
Ha-cheol Song ◽  
Seung-soo Na ◽  
Min-cheol Park ◽  
...  
Keyword(s):  
Automated Design ◽  
Design Algorithm ◽  
Oil Tankers

Geometric Reasoning on Molding Planning for Multishot Mold Design

2006 ◽  
Vol 6 (3) ◽  
pp. 241-251 ◽  
Author(s):  
Zhou-Ping Yin ◽  
Han Ding ◽  
You-Lun Xiong
Keyword(s):  
Design Method ◽  
Automated Design ◽  
Geometric Reasoning ◽  
Geometric Constraints ◽  
Assembly Planning ◽  
Material Objects ◽  
Mold Design ◽  
Assembly Model ◽  
Contact Graph ◽  
Planning Approach

This paper presents algorithms for automated design of multishot molds for manufacturing multimaterial or multicolor objects, and focuses on molding planning that determines a sequence of mold stages required to produce the desired object. By modeling a multimaterial object as an assembly of homogenous components, a geometric reasoning approach is proposed to generate feasible or practical mold stage sequences by combining the assembly planning approach and the two-plate mold design method. First, a graph-based assembly model, namely the attributed contact graph, is derived from the B-rep models of the constituent components of the gross object by detecting and representing all the contacts between mating components explicitly. Then, all feasible mold stage sequences, represented by an AND/OR graph, are generated by reasoning on geometric constraints due to the demoldability and connectedness requirements using an assembly-by-disassembly strategy. Depending on its demoldability, each component is to be made by one of the three basic molding strategies with varied mold stages and/or mold pieces. To narrow the choice, an optimal or practical molding plan is searched from the feasible molding plans according to some criteria such as the number of mold stages, the number of side cores, and flatness of the parting line. Finally, starting from the last mold stage, mold pieces for each mold stage of the selected molding plan are constructed recursively. The feasibility of the proposed algorithms is demonstrated through an implemented prototypical system, which has been tested successfully with various multi-material objects.

Geometric algorithms for automated design of multi-piece permanent molds

2004 ◽  
Vol 36 (3) ◽  
pp. 241-260 ◽  
Author(s):  
Alok K. Priyadarshi ◽  
Satyandra K. Gupta
Keyword(s):  
Automated Design ◽  
Geometric Algorithms

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.

Yield constrained automated design algorithm for power optimized pipeline ADC

Integration ◽  
2020 ◽  
Vol 74 ◽  
pp. 55-62
Author(s):  
Vala Sadrafshari ◽  
Shamin Sadrafshari ◽  
Mohammad Sharifkhani
Keyword(s):  
Automated Design ◽  
Pipeline Adc ◽  
Design Algorithm

A Region Based Method to Automated Design of Multi-Piece Molds with Application to Rapid Tooling

2002 ◽  
Vol 2 (2) ◽  
pp. 86-97 ◽  
Author(s):  
Yong Chen ◽  
David W. Rosen
Keyword(s):  
Linear Programming ◽  
Programming Problem ◽  
Linear Programming Problem ◽  
Problem Formulation ◽  
Automated Design ◽  
Rapid Tooling ◽  
Mold Design ◽  
Molded Parts ◽  
Parting Direction ◽  
Injection Molded

Particularly for rapid tooling applications, delivering prototype parts with turn-around times of less than two weeks requires fast, proven mold design methods. We present a region-based approach to automated mold design that is suitable for simple two-piece molds (consisting of core and cavity), as well as molds with many additional moving sections. In our region-based approach, part faces are partitioned into regions, each of which can be formed by a single mold piece. The basic elements of our approach are concave regions (generalized pockets) and convex faces since these elements are central to the identification of regions. This paper focuses on the initial steps of automated mold design, including a problem formulation, methods for identifying the basic elements from part faces, and combining them into regions. By seeking to minimize the number of mold pieces, different partitions of faces into regions are explored until the smallest number of regions is found. During this process, a linear programming problem is adopted for finding a satisfactory parting direction of a region. Algorithms are presented for the region generating and combining process. Our approach is illustrated with several examples of industrial injection molded parts.

Towards Automated Design of the Feed System of Injection Molds by Integrating CAE, Iterative Redesign and Features

1995 ◽  
Vol 117 (1) ◽  
pp. 72-77 ◽  
Author(s):  
R. K. Irani ◽  
B. H. Kim ◽  
J. R. Dixon
Keyword(s):  
Three Dimensional ◽  
Automated Design ◽  
Design System ◽  
Mold Design ◽  
Performance Parameters ◽  
Feed System ◽  
Design Variables ◽  
Runner Design ◽  
Prototype Software

A prototype software system that automatically designs the gating and runner systems, which comprise the feed system, of injection molds is described. The system, called AMDS (Automated Mold Design System), integrates CAE, with iterative redesign and knowledge stored in a features representation of the part. Gating design involves the generation of the best gating configuration represented by number, location, and type of gates, and the determination of the best conditions under which plastic should enter through the gates. Runner design also involves the generation of a runner layout followed by the sizing of the runner segments. The design of both systems is iterative, whereby the design variables are changed, the new design analyzed, evaluated, and redesigned if necessary, until an acceptable design is obtained. The evaluation of the gating design is based on eighteen performance parameters, while the evaluation of the runner system is based on four performance parameters. The system has been tested on three-dimensional parts made up of planar rectangular wall features with holes as add-on features.

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