Delivering Value In A Global Aerospace Manufacturer Through The Effective Use Of Numerical Process Simulation

2004 ◽  
Author(s):  
M. J. Ward
Keyword(s):  
Process Simulation ◽  
Numerical Process ◽  
Effective Use

Design for Injection Molding: Using Dimensional Analysis to Assess Fillability

1994 ◽  
Author(s):  
Douglas C. Mehl ◽  
Kurt A. Beiter ◽  
Kos Ishii
Keyword(s):  
Dimensional Analysis ◽  
Process Simulation ◽  
Design Guidelines ◽  
Experimental Program ◽  
Flow Length ◽  
Numerical Process ◽  
Injection Molded ◽  
Plastic Parts ◽  
Injection Molded Plastic

Abstract This paper addresses the determination of wall thicknesses and gating schemes in the preliminary design of injection-molded plastic parts. Today, most of the existing design guidelines come in the form of experience-based qualitative rules. If the designers already have a detailed geometry of the part, the numerical process simulation program provides another form of design aid. There exists a huge gap between these two types of design aids; the experience-based guidelines are often too vague, while the process simulation programs come too late to impact preliminary part design. To fill this gap, this paper develops physics-based guidelines that utilize dimensional analysis techniques. Experiments and simulation studies can deduce non-dimensional relationships between flow length, thickness, material, and process parameters. The guidelines will aid plastic component designers in determining wall-thickness, gating schemes, and in selecting the material in the preliminary stages of part design. This paper describes the formulation of the non-dimensional charts for fillability assessment, and explains the use of these charts in part design. We further outline an ongoing experimental program to validate and refine our formulation.

Special Issue on Process Simulation

2013 ◽  
Vol 7 (1) ◽  
pp. 5-5
Author(s):  
Takashi Matsumura
Keyword(s):  
Process Simulation ◽  
Machine Tools ◽  
High Performance ◽  
Advanced Materials ◽  
Manufacturing Processes ◽  
Special Issue ◽  
Process Simulations ◽  
Investment Returns ◽  
Manufacturing Technologies ◽  
Effective Use

High production rates and low costs in manufacturing process should be considered in the manufacturing design divisions. Process simulation, therefore, plays an important role in implementing high performance manufacturing. Simulation is expected to improve the manufacturing processes and the human activities without production faults and downtime of the manufacturing facilities. The production simulation has become diversified with requirements for the manufacturing processes. Then, the effective use of the simulation is also an important issue for the simulation users considering investment returns. Recently advanced materials have been applied to products with developments in material science. The machining systems have also become complicated with progress in the machine tools. Therefore, the process simulations should be developed in terms of materials and machine tools. This special issue includes 9 papers for providing innovative approaches to advanced modeling and simulations in manufacturing technologies and machine tool systems. The special issue also includes discussions in the simulation with the advanced materials for future manufacturing processes. I thank the authors for their generous cooperation and the editing staff for its many contributions.

Ozone and PAN Formation Inside and Outside of the Berlin Plume — Process Analysis and Numerical Process Simulation

2002 ◽  
pp. 289-321 ◽  
Author(s):  
U. Corsmeier ◽  
N. Kalthoff ◽  
B. Vogel ◽  
M.-U. Hammer ◽  
F. Fiedler ◽  
...  
Keyword(s):  
Process Simulation ◽  
Process Analysis ◽  
Numerical Process

Toward Automatic Process Simulators: Part I—Modular Numerical Procedures

1998 ◽  
Vol 120 (1) ◽  
pp. 1-8 ◽  
Author(s):  
E. Sciubba
Keyword(s):  
Process Design ◽  
Process Simulation ◽  
Automatic Process ◽  
Computer Assisted ◽  
Qualitative Synthesis ◽  
Complex Activity ◽  
General Process ◽  
Numerical Process ◽  
Computer Codes ◽  
Quantitative Calculations

This paper presents a general design approach involving automatic, intelligent process simulation procedures. The aim is to derive a general set of design principles and methodologies that can be developed into computer-assisted procedures. This first part deals with numerical, quantitative calculations, i.e., with what commonly goes under the name of “Numerical Process Simulation.” It is argued that the existing design methods can result in computer codes or packages that perform exactly (and deterministically) the numerical operations an engineer would perform. It is also shown that modularity in these codes is dictated by the necessity of automatically implementing numerical procedures that depend on the structure of the process under examination, rather than by user’s convenience and ease of maintenance. An example of a modular, structure-oriented code (CAMEL) is given and discussed in detail, while numerical applications are discussed elsewhere [4]. The second part deals with the more complex qualitative approach to process design, i.e., with the possibility of implementing automatic “expert” procedures that perform the same conceptual tasks as human process engineers. It is shown that by means of Artificial Intelligence techniques it is possible to mimic (to an extent) the “thinking patterns” of a human expert, and to produce process schemes that are both acceptable and realistic. A general process synthesis package (COLOMBO) is described and some of its applications discussed. The main goal of the two parts of the paper is to show that the very complex activity of process design can be executed automatically, not only in principle, but in actual applications, and that both qualitative synthesis and quantitative calculations are possible with the present state of the art of our computational facilities.

Design for Injection Molding: Using Process Simulation to Assess Tolerance Feasibility

1994 ◽  
Author(s):  
David R. Busick ◽  
Kurt A. Beiter ◽  
Kos Ishii
Keyword(s):  
Injection Molding ◽  
Process Simulation ◽  
Process Variations ◽  
Simulation Software ◽  
Injection Molding Process ◽  
Molding Process ◽  
Injection Molding Simulation ◽  
Injection Molded ◽  
Effective Use ◽  
Dimensional Errors

Abstract This paper proposes an effective use of process simulation in the dimensional tolerancing of injection molded thermoplastic components. The complexities of the injection molding process make it difficult for designers to assign dimensional tolerances. No standard method exists for predicting the feasibility of a design tolerance. Advances in injection molding simulation software offer information that could aid in tolerancing. However, engineers have not effectively used these programs for tolerancing. This paper proposes a methodology for using process simulation in evaluating the feasibility of a tolerance scheme. The methodology entails using simulation to quantify the dimensional errors due to process variations and estimate sensitivities. Comparison of simulation results with tolerances specified by designers helps them evaluate whether the desired tolerances are feasible. The paper describes the steps required for estimating the dimensional errors and defines criticality as a measure of tolerance feasibility. A plastic housing for an electrical switch serves as an illustrative example.

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