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RISS 인기검색어
- 검색키워드
- 저자 : Roberto Spina (검색결과 2 건)
- 무료
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Analysis of Lens Manufacturing with Injection Molding
Roberto Spina,Paul Walach,Julian Schild,Christian Hopmann 한국정밀공학회 2012 International Journal of Precision Engineering and Vol. No.
In the present research, the authors investigated the lens manufacturing with the injection molding process by using the geometrical contour errors as the quality criterion. In order to produce functional injection-molded optical components, a special cavity mold was used to perform experimental testing for biconvex spherical lenses and numerical simulation was used to help during mimic of the process behavior. The approach was divided into validation step and optimization step. In the validation step, a reliable numerical model was designed to reproduce material features during filling and shrinkage, in order to correctly evaluate lens deflection. In the optimization step, the Grey Relational Component analysis coupled to the Taguchi Design was used to identify the optimal parameter set leading to the best values of lens total deflection, Peak-to-Valley and Root Mean Square between real and ideal lens surface geometry.
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Analysis of Polymer Crystallization and Residual Stresses in Injection Molded Parts
Roberto Spina,Marcel Spekowius,Rainer Dahlmann,Christian Hopmann 한국정밀공학회 2014 International Journal of Precision Engineering and Vol. No.
The main objective of the presented work is to develop an integrated computational environment that predicts final part properties made of semicrystalline thermoplastics. This objective is fulfilled by adopting the following two-step approach: 1) identification of an analytical scheme to correlate crystallization parameters with engineer properties; 2) apply the analytical scheme to the numerical simulation to study the polymer and final properties of the part. In this work the crystallization evolution in cooling phase, mainly influenced by thermal gradients, and its effect on the final part properties are investigated. The numerical method, crystallization models and their implementation into numerical software are described as well as the experimental data.
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