Polímeros: Ciência e Tecnologia
https://revistapolimeros.org.br/article/doi/10.1590/S0104-14282008000300013
Polímeros: Ciência e Tecnologia
Scientific & Technical Article

Influência do Desempenho Térmico de Moldes Fabricados com Compósito Epóxi/Alumínio nas Propriedades de PP Moldado por Injeção

Thermal Behavior of Epoxy/Aluminum Rapid Tooling Composite During Injection Molding of Polypropylene

Sabino Netto, Aurélio da C.; Villamizar, Felix A. Y.; Ahrens, Carlos H.; Salmoria, Gean V.

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Resumo

O surgimento das tecnologias de prototipagem rápida (RP) e de ferramental rápido (RT) tem despertado interesse da indústria de moldes de injeção. O vazamento de termofixos com cargas metálicas possibilita a construção de moldes usando materiais compósitos, os quais apresentam maior resistência que os utilizados por outras técnicas RT. Neste trabalho foi estudado o comportamento térmico de moldes fabricados em epóxi/alumínio durante a injeção de polipropileno através de avaliações da estrutura e de propriedades mecânicas utilizando difração de raio X e ensaios de dureza e de tração. Os corpos-de-prova injetados no molde em compósito epóxi/alumínio apresentaram pequenas diferenças no grau de cristalinidade das superfícies analisadas e propriedades mecânicas semelhantes aos corpos-de-prova injetados em molde de aço. O estudo mostrou um razoável desempenho térmico do molde compósito durante a injeção de polipropileno evidenciando a viabilidade de utilização destes moldes na produção de pequenas séries de protótipos e de produtos neste termoplástico.

Palavras-chave

Desempenho térmico, molde compósito, moldagem por injeção de polipropileno

Abstract

Rapid prototyping (RP) and rapid tooling (RT) technologies are gaining increasing importance in the injection molding industry. Casting of resin/metal composites allows the construction of molds with greater resistance than those manufactured by other RT techniques such as Stereolithography. In this work, the thermal behavior of molds manufactured in epoxy/aluminum during the injection molding of polypropylene specimens was investigated. Structural and mechanical characterization of the molded specimens included X ray analysis, hardness and tensile testing. The samples presented small differences in the degree of crystallinity and similar mechanical properties in comparison with samples injected into steel molds. This study showed a reasonable thermal performance of the epoxy/aluminum mold during the injection molding of polypropylene, thus demonstrating the viability of using these molds to produce a few number of prototypes or products with this thermoplastic.

Keywords

Thermal behavior, composite mold, polypropylene injection molding

References



1. Jacobs, P. F. - Stereolithography & Other RP&M Technologies: From Rapid To Rapid Tooling, 1st ed. Booknews Inc. (1996).

2. Alvarez, R. - "Time to market & rapid tooling and OEM perspective". in: Annals of 57th ANTEC Annual Technical Conference, New York (1999).

3. Dusel, K. H.; Eschl, J.; Eyerer, P. & Luck, T. - "Simulation and Applications of the Injection Moulding Process". Institute for Polymer Testing and Polymer Science IKP - University of Stuttgart, Germany (1998).

4. Karapatis, N. P.; Van Griethuysen, J. P. S. & Glardon, R. - "Direct rapid tooling: a review of current research". Rapid Prototyping Journal, MCB University Press, 4, p.77-89 (1998).

5. Radstok, E. - "Rapid Tooling". Rapid Prototyping Journal. MCB University Press, 5 (4) p.164-168 (1999).

6. Ferreira, J. C. & Mateus, A. - "Studies of rapid soft tooling with conformal cooling channels for plastic injection moulding". Journal of Materials Processing Technology, 142, p.508-516 (2003).

7. Dunne, P.; Soe, S. P.; Byrne, G.; Venus, A; & Wheatley, A. R. - "Some demands on rapid prototypes used as master patterns in rapid tooling for injection moulding". Journal of Materials Processing Technology (2004).

8. Masood, S. H.; Song, W. Q.; Hodgkin, J. K. & Friedl, C. - "Rapid Tooling for Injection Moulding using Fused Deposition Modelling". in: Annals of 57th ANTEC Annual Technical Conference, New York (1999).

9. Foggiatto, J. A.; Salmoria, G. V. & Ahrens, C. - "Behavior of injection mold manufactured in ABS, PC and PPSF by Fused deposition modeling". Polymer Processing Society, Americas Regional Meeting Symposia, PPS 2004, Florianópolis-SC, Brazil (2004).

10. Chung, S. I.; Im, Y. G.; Jeong, H. D. & Nakagawa, T. - "The effects of metal filler on the characteristics of casting resin for semi-metallic soft tools". Journal of Materials Processing Technology, 134, p.26-34 (2003).

11. Rees, H. - Mold Engineering, Carl Hanser Verlag, Munich (1995).

12. Li, Y.; Gargiulo, E. P. & Keefe, M. - "Studies in direct rapid tooling using stereolithography". Journal of Manufacturing Science and Engineering. 122, p.317-322 (2000).

13. Brito, Z. & Sanchez, G. - "Influence of metallic fillers on the thermal and mechanical behaviour in composites of epoxy matrix". Composites Strutures, 48, p.79-81 (2000).

14. Hunstman. Aluminium filled epoxy resin RenCast 436. Data sheet. Disponível em http://www.maxepoxi.com.br/sistemas_epoxi.asp.

15. Chen, H. B.; Karger-Kocsis, J.; Wu, J. S.; & Varga, J. - "Fracture Toughness of alpha and Beta-phase polypropylene homopolymers and random and block copolymers". Polymer, 43, p.6505-6514 (2002).

16. Grein, C; Plummer, C. J. G.; Kaush, H. H.; Germain, Y. & Beguelin, P. H. - "Influence of Beta nucleation on the mechanical properties of isotactic polypropylene and rubber modified isotactic polypropylene". Polymer, 43, p.3279-3293 (2002).

17. Cermak, R.; Obadal, M.; Ponizil, P.; Polaskova, M.; Stoklasa, K. & Lengalova, A. - "Injection moulded α and β-polypropylenes: I. Structure vs. Processing parameters". European Polymer Journal. 41, p.1838-1845 (2005).

18. Brucato, A. V.; Piccarolo, S. & La Carrubba, V. - "An experimental methodology to study polymer crystallization under processing conditions. The influence of high cooling rates". Journal Chemical Engineering Science. 57, p.4129-4143 (2002).

19. Coccorullo, I.; Pantani, R. & Titomanlio, G. - "Crystallization kinetics and solidified structure in iPP under high cooling rates". Polymer. 44, p.307-318 (2002).
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