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High temperature resistant tools and master models: seamless molding paste (SMP) technology / Philippe D. Christou in SAMPE JOURNAL, Vol. 42, N° 6 (11-12/2006)

[article]  inSAMPE JOURNAL > Vol. 42, N° 6 (11-12/2006) . - p. 7-13 Titre : High temperature resistant tools and master models: seamless molding paste (SMP) technology Type de document : texte imprimé Auteurs : Philippe D. Christou, Auteur Année de publication : 2006 Article en page(s) : p. 7-13 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 668.4 Plastiques, vinyles Résumé : This paper presents a new solution for making tools having resistance to high temperatures or to produce large master models of high quality surface. The standard method consisting of bonding and machining temperature resistant boards is time consuming and a major issue is that the bond lines lead frequently to surface defects on the final parts. An earlier approach involves a manual application of epoxy "patties". Such a process has not completely solved surface defect issues and is still costly a labor intensive. Huntsman developed a solution based on seamless modeling paste (SMP) having a dual function: a machinable surface that is also adhesive between light weight structures. It is applied with conventional industrial equipment thus making the method tim effective, and above all, suitable for very large surface applications without any bond lines. Epoxy chemistry with latent and non latent hardeners give temperature resistance up to 200°C (HDT) after post-curing, and compressive strengths above 150 MPa. After a description of the historical application processes and defects, this paper will present the new solution from an application and performance perspective. Chemical thixotropy concept, that is major contributor to the exceptional processability of this "hifh temperature resistant SMP", will also be discussed. Note de contenu : - PROCESS CONSIDERATIONS : Processes descriptions and comparisons - Traditional process - "Patties" process - "High Temp" process - MATERIAL CONSIDERATION : Material selection - Application parameters of SMP LMD2537/LMD2538 - Material characterization - Density - Hardness - Coefficient of thermal expansion (CTE) - Heat deflection temperature (HDT) - Compressive strength and modulus - Flexural strength - Linear shrinkage - Vacuum integrity - Material: performance/application relationship - CHEMICAL THIXOTROPY CONCEPT Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=23442 [article]

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Innovative manufacturing for the solid rocket motors / Jaime Stahl in SAMPE JOURNAL, Vol. 42, N° 6 (11-12/2006)

[article]  inSAMPE JOURNAL > Vol. 42, N° 6 (11-12/2006) . - p. 21-27 Titre : Innovative manufacturing for the solid rocket motors Type de document : texte imprimé Auteurs : Jaime Stahl, Auteur ; Emil Pora, Auteur ; Patrick Freeman, Auteur Année de publication : 2006 Article en page(s) : p. 21-27 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 668.4 Plastiques, vinyles Résumé : The future of enhanced missile systems hinges on the development of significant innovative improvements in the manufacturing of composite solid rocket motor casings. Current manufacturing of composite motors is extremely laborious. Cornerstone Research Group, Inc. (CRG) has developed a novel rotomolding technology to significantly adjust the cost-versus-performance tradeoff for composite solid rocket motors (SRM). The approach involves full development of a novel rotomold process technology to manufacture SRM in a much less expensive manner while allowing for improved performance insulation designs. The rotomold process will result in low-cost-pre-insulated leave-in-mandrels. These mandrels will be inserted into the traditional filament winding manufacturing process currently used to manufacture SRM. This approach will eliminate more than 50% of the manufacturing labor. Additional benefits exist in the capacity to customize insulation designs as needed to improve performance. This paper presents the progress made in this research, including discussions on the development of the rotomolding process, demonstration of feasibility, process characterization, and future plans. Note de contenu : - EXPERIEMENTAL : System design and fabrication - Process demonstration - Thickness characterization - RESULTS AND DISCUSSION : System development - Process demonstration - Thickness characterization Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=23443 [article]

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Carbon foam tooling: self-heating concept, evaluation and demonstration / Douglas J. Merriman in SAMPE JOURNAL, Vol. 42, N° 6 (11-12/2006)

[article]  inSAMPE JOURNAL > Vol. 42, N° 6 (11-12/2006) . - p. 42-49 Titre : Carbon foam tooling: self-heating concept, evaluation and demonstration Type de document : texte imprimé Auteurs : Douglas J. Merriman, Auteur ; Rick Lucas, Auteur Année de publication : 2006 Article en page(s) : p. 42-49 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 668.4 Plastiques, vinyles Résumé : A new carbon foam manufacturing process has been developed resulting in a low-cost, high-strength material that has been proving attractive for creation of tooling for composite parts. With the increasing number and scale of composite parts being manufactured, the reduction of cycle times and increased processing flexibility is crucial to both increasing production rates and lowering component costs. To meet these demands a composite tool can be constructed utilizing the new carbon foam material, CFOAM®, which serves as both the tool structure and heating element. The ability to heat a tool outside of an oven or autoclave provides additional flexibility as well as a reduction in capital equipment requirements and costs. Furthermore, using a self-heating tool in conjunction with autoclave processing can reduce cycle times and/or improve temperature uniformity as the tool becomes an active source of heating rather than a passive parasitic thermal mass. A CFOAM tool was constructed in which the material served as both structure and heating element. Construction techniques are discussed, and thermal imaging taken of the resulting tool during heating trials is examined. Note de contenu : - INTRODUCTION : Self-heating tooling - CFOAM background- Characteristics of the CFOAM tooling material - SELF-HEATING TOOLING CONSTRUCTION : Tool fabrication - EXPERIMENTAL - HEATING OPTIMIZATION : Controlled cross sectional uniformity - Oriented voltage potential perpendicular to disruptive features - Zoned control of heating Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=23456 [article]

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Tooling materials: typical properties and characteristics / Scott W. Beckwith in SAMPE JOURNAL, Vol. 42, N° 6 (11-12/2006)  

[article]  inSAMPE JOURNAL > Vol. 42, N° 6 (11-12/2006) . - p. 53 Titre : Tooling materials: typical properties and characteristics Type de document : texte imprimé Auteurs : Scott W. Beckwith, Auteur ; Louis C. Dorworth, Auteur Année de publication : 2006 Article en page(s) : p. 53 Langues : Américain (ame) Index. décimale : 668.4 Plastiques, vinyles Résumé : There are a wide variety of tooling options available within our industry. Traditionally composite structures have been fabricated over the years using metal or composite tooling systems. However, a number of new products and materials have come along recently. The authors thought it might be worthwhile to provide our SAMPE membership with a table of typical properties summarizing both the traditional and newer materials. In general, it must be remembered that many tooling materials, particularly those made from composites, have a range of design properties. This is primarily because composite structural laminates (whether they be tools themselves or end-use structures) can vary in fiber content, fiber orientation and lamination sequence. We hope that you will find this table useful in your work. En ligne : http://www.btgcomposites.com/documents/ToolingMaterials---Nov-Dec06Col.pdf Format de la ressource électronique : PDF Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=23457 [article]

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Innovative uses of reconfigurable tooling for rapid, low-cost composite manufacturing, repair, and replication / Linda Clements in SAMPE JOURNAL, Vol. 42, N° 6 (11-12/2006)

[article]  inSAMPE JOURNAL > Vol. 42, N° 6 (11-12/2006) . - p. 70-75 Titre : Innovative uses of reconfigurable tooling for rapid, low-cost composite manufacturing, repair, and replication Type de document : texte imprimé Auteurs : Linda Clements, Auteur ; John L. Crowley, Auteur ; Ted Jacobson, Auteur Année de publication : 2006 Article en page(s) : p. 70-75 Langues : Américain (ame) Index. décimale : 668.4 Plastiques, vinyles Résumé : Conventional tooling for composite manufaturing is extensive and requires long lead times. 2Phase Technologies, Inc. has created Reconfigurable Tooling Systems (RTS) that can quickly produce low-cost, lightweight tooling usable in most composite fabrication processes. These systems are based upon a new class of state-change materials that can be cycled from a liquid-like state to a solid state at room temperature with no change in dimensions. This paper describes the use of the tooling and tooling systems for part fabrication, replication, and repair, as well as the production of trapped tooling for applications including filament-winding of structures with precision-located features. This reconfigurable tooling technology enables a completely new approach to many composite manufacturing and repair operations, permitting designs and innovations that previously were difficult or impossible. Note de contenu : - Part prototyping, repair, and replication - Tapped tooling Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=23458 [article]

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