Polymer and Materials Science
Wiley InterScience Backfile Collection 1832-2000
Chemistry and Pharmacology
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Plastic components can only be competitive if they make use of the material and thereby emerge technically and economically superior to conventional materials. This places, high requirements on designers and presupposes extensive experience. A situation where the optimal version can only be established in expensive prototype molds is unacceptable. Above all, though, the time that this takes is preventing substitution by plastic parts from gaining an increasing market in the industrial component sector. The tasks which companies have to tackle today include increasing performance and making freely available experience that is currently confined to individuals. The establishment of specified work sequences helps to avoid errors. The chief tasks involved in design are compilation of specifications, material selection, and shaping and dimensioning. The designer's work can be broken down into acquisition of information, calculation, decision making, and drawing. The use of computers can help towards rationalization in the design field as well. This rationalization ought not only to give shorter transit times but improved components as well. The following program packages are available: a data bank program for managing design data, a search program with corresponding data file for material selection, a 3D graphic system for compiling drawings, a FE program for dimensioning, and an expert program to aid the designer in decision making. Apart from the conventional free design it is also possible to define individual functional elements or assemblies, such as snap fastenings or ribs, by way of design macros. These macros are designed and calculated in principle and then simply aligned auttomatically when incorporated in a specific part. Computersided dimensioning makes it possible to establish all the factors influencing quality in a specific application and to recognize weak points in simulated tests right at the design stage. The conventional concept of dimensioning (applying a sum of reducing coefficients to make allowance for loading) has thus been dispensed with, and a route is shown which permits precise allowance to be made for all the influences in a particular loading case. This therefore ensures optimum material utilization.
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