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Solidification modeling of a spiral casting to determine material fluidity

Description: In casting, fluidity is the measure of the distance a metal can flow in a channel before being stopped by solidification. During mold filling, the metal loses heat to the surrounding mold, thereby cooling and becoming more viscous until the leading portion solidifies and no further flow is possible. A coupled heat-transfer and fluid-flow modeling of a spiral, involving the use of thermophysical properties to determine material fluidity, has been conducted. Fluidity experiments were performed by… more
Date: November 1, 1993
Creator: Ahuja, S.; Domanus, H. M.; Schmitt, R. C.; Chuzhoy, L. & Grabel, J. V.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Solidification modeling of a spiral casting to determine material fluidity

Description: In casting, fluidity is the measure of the distance a metal can flow in a channel before being stopped by solidification. During mold filling, the metal loses heat to the surrounding mold, thereby cooling and becoming more viscous until the leading portion solidifies and no further flow is possible. A coupled heat-transfer and fluid-flow modeling of a spiral, involving the use of thermophysical properties to determine material fluidity, has been conducted. Fluidity experiments were performed by… more
Date: February 1, 1994
Creator: Ahuja, S.; Domanus, H. M.; Schmitt, R. C.; Chuzhoy, L. & Grabel, J. V.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Rapid prototyping: A paradigm shift in investment casting

Description: The quest for fabricating complex metal parts rapidly and with minimal cost has brought rapid prototyping (RP) processes to the forefront of the investment casting industry. Relatively recent advances in DTM Corporation`s selective laser sintering (SLS) and 3D Systems stereolithography (SL) processes have had a significant impact on the overall quality of patterns produced using these rapid prototyping processes. Sandia National Laboratories uses patterns generated from rapid prototyping proces… more
Date: September 1, 1996
Creator: Atwood, C. L.; Maguire, M. C.; Baldwin, M. D. & Pardo, B. T.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Advances in rapid prototyping

Description: Recent advances in stereolithography and selective laser sintering have had a significant impact on the overall quality of parts produced using these rapid prototyping processes. The development and implementation of 3D System`s QuickCast{trademark} resin and software for building investment casting patterns have proven to be major steps toward fabricating highly accurate patterns with very good surface finishes. Sandia uses patterns generated from rapid prototyping processes to reduce the cycl… more
Date: December 31, 1993
Creator: Atwood, C. L.; McCarty, G. D.; Pardo, B. T. & Bryce, E. A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Rapid tooling for functional prototyping of metal mold processes: Literature review on cast tooling

Description: This report is a literature review on cast tooling with the general focus on AISI H13 tool steel. The review includes processing of both wrought and cast H13 steel along with the accompanying microstructures. Also included is the incorporation of new rapid prototyping technologies, such as Stereolithography and Selective Laser Sintering, into the investment casting of tool steel. The limiting property of using wrought or cast tool steel for die casting is heat checking. Heat checking is address… more
Date: November 1, 1995
Creator: Baldwin, Michael D. & Hochanadel, Patrick W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Clean ferrous casting technology research. Final technical report, September 29, 1993--December 31, 1995

Description: This is the final report covering work performed on research into methods of attaining clean ferrous castings. In this program methods were developed to minimize the formation of inclusions in steel castings by using a variety of techniques which decreased the tendency for inclusions to form during melting, casting and solidification. In a second project, a reaction chamber was built to remove inclusions from molten steel using electromagnetic force. Finally, a thorough investigation of the cau… more
Date: January 31, 1996
Creator: Bates, C. E.; Griffin, J.; Giese, S. R. & Lane, A. M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Advanced Lost Foam From Casting Technology

Description: Previous research made significant advances in understanding the Lost Foam Casting (LFC) Process and clearly identified areas where additional research was needed to improve the process and make it more functional in an industrial environment. The current project focused on five areas listed as follows: Task 1: Precision Pattern Production Task 2: Pattern Coating Consistency Task 3: Sand Fill and Compaction Effects Task 4: Pattern Gating Task 5: Mechanical Properties of Castings. This report su… more
Date: May 1996
Creator: Bates, C. E.; Littleton, H. E.; Askeland, D.; Griffin, J. & Miller, B. A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Sol-gel replicated optics made from single point diamond turned masters exhibit fractal surface roughness

Description: Deterministic optics manufacturing, notably single point diamond turning (SPDT) has matured such that the current generation of machines is capable of producing refractive and reflective optics for the visible wavelength region that are quite acceptable for many applications. However, spiral tool marks are still produced that result in unwanted diffractive scattering from grating-like features having a spatial frequency determined by the machine feed, tool radius, and other influences such as v… more
Date: May 1, 1996
Creator: Bernacki, B. E.; Miller, A. C., Jr.; Evans, B. M., III; Moreshead, W. V. & Nogues, J. L. R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Hybrid optics for the visible produced by bulk casting of sol-gel glass using diamond-turned molds

Description: Recent combinations of diffractive and refractive functions in the same optical component allow designers additional opportunities to make systems more compact and enhance performance. This paper describes a research program for fabricating hybrid refractive/diffractive components from diamond-turned molds using the bulk casting of sol-gel silica glass. The authors use the complementary dispersive nature of refractive and diffractive optics to render two-color correction in a single hybrid opti… more
Date: July 1, 1995
Creator: Bernacki, B. E.; Miller, A. C.; Maxey, L. C.; Cunningham, J. P.; Moreshead, W. V. & Nogues, J. L. R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

One-piece, composite crucible with integral withdrawal/discharge section

Description: A one-piece, composite open-bottom casting mold with integral withdrawal section is fabricated by thermal spraying of materials compatible with and used for the continuous casting of shaped products of reactive metals and alloys such as, for example, titanium and its alloys or for the gas atomization thereof.
Date: July 30, 2002
Creator: Besser, Matthew; Terpstra, Robert L. (Iowa State Univ., Ames, IA); Sordelet, Daniel J.; Anderson, Iver E.; Hartman, Alan D.; Argetsinger, Edward R. et al.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department
open access

Injection Molding of Plastics from Agricultural Materials

Description: The objective of this research was to conduct a systematic study to relate injection molding parameters to properties of blends of starch and synthetic polymer. From this study, we wished to develop a thorough understanding of the injection molding process and gain significant insight into designing molds and aiding in developing products cheaply and efficiently.
Date: February 22, 2001
Creator: Bhattacharya, M. & Ruan, R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Reduction of beta activity from depleted derbies, ingots and crucibles

Description: The reduction of beta radiation on uranium ingot and crucible surfaces was demonstrated in the production casting operation by adding a mixture of slag liner material (MgF/sub 2/) and calcium fluoride to the remelt charge. The beta emitters (/sup 234/Th and /sup 234/Pa) are largely discharged with the fluorides into drums during a remote crucible burnout operation; thereby, reducing operator exposure to beta radiation. A production test showed that very low beta radiation from uranium flat cast… more
Date: September 1, 1984
Creator: Briggs, G.G.; Schonegg, E. & Kato, T.R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Mold-filling experiments for validation of modeling encapsulation. Part 1, "wine glass" mold.

Description: The C6 project 'Encapsulation Processes' has been designed to obtain experimental measurements for discovery of phenomena critical to improving these processes, as well as data required in the verification and validation plan (Rao et al. 2001) for model validation of flow in progressively complex geometries. We have observed and recorded the flow of clear, Newtonian liquids and opaque, rheologically complex suspensions in two mold geometries. The first geometry is a simple wineglass geometry in… more
Date: June 1, 2005
Creator: Castaneda, Jaime N.; Grillet, Anne Mary; Altobelli, Stephen A. (New Mexico Resonance, Albuquerque, NM); Cote, Raymond O. & Mondy, Lisa Ann
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Simulation of fluid flow induced by opposing ac magnetic fields in a continuous casting mold

Description: A numerical simulation was performed for a novel electromagnetic stirring system employing two rotating magnetic fields. The system controls stirring flow in the meniscus region of a continuous casting mold independently from the stirring induced within the remaining volume of the mold by a main electromagnetic stirrer (M-EMS). This control is achieved by applying to the meniscus region an auxiliary electromagnetic field whose direction of rotation is opposite to that of the main magnetic field… more
Date: July 1, 1995
Creator: Chang, F.C.; Hull, J.R. & Beitelman, L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Reusable molds for casting U-Zr alloys

Description: Refractory oxides, carbides, nitrides and sulfides were examined as mold coating materials for use in casting nuclear fuel. The molds require excellent high temperature chemical and mechanical stability combined with reasonable room temperature ductility to allow for fuel removal. Coatings were applied onto quartz and refractory metal coupons using various techniques. Sessile drop tests employing molten U-10%Zr (by weight) at 1550{degrees}C were used to characterize coating performance. Results… more
Date: September 1, 1992
Creator: Chen, P. S.; Stevens, W. C. & Trybus, C. L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Reusable molds for casting U-Zr alloys

Description: Refractory oxides, carbides, nitrides and sulfides were examined as mold coating materials for use in casting nuclear fuel. The molds require excellent high temperature chemical and mechanical stability combined with reasonable room temperature ductility to allow for fuel removal. Coatings were applied onto quartz and refractory metal coupons using various techniques. Sessile drop tests employing molten U-10%Zr (by weight) at 1550[degrees]C were used to characterize coating performance. Results… more
Date: September 1, 1992
Creator: Chen, P. S.; Stevens, W. C. (Advanced Technology Materials, Inc., Danbury, CT (United States)) & Trybus, C. L. (Argonne National Lab., Idaho Falls, ID (United States))
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

MACHINING ELIMINATION THROUGH APPLICATION OF THREAD FORMING FASTENERS IN NET SHAPED CAST HOLES

Description: The ultimate objective of this work was to eliminate approximately 30% of the machining performed in typical automotive engine and transmission plants by using thread forming fasteners in as-cast holes of aluminum and magnesium cast components. The primary issues at the source of engineers’ reluctance to implementing thread forming fasteners in lightweight castings are: * Little proof of consistency o… more
Date: May 2, 2012
Creator: Cleaver, Ryan J.; Cleaver, Todd H. & Talbott, Richard
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Materials Engineering Laboratory interim report, LF-8 and LF-9 support pad fabrication

Description: This project was for the fabrication of 50 LF-8 and LF-9 support pads (clamshells) which would conform to the Los Alamos Scientific Laboratory (LASL) drawing provided in Appendix A of this report. Discussions on this contract were initiated in early October and involved delivery of all the pads by January 31, 1977. The project was modified to deliver only 10 pads by the above date. However, since the period encompassed Thanksgiving.and Christmas shutdowns, it was decided that delivery of four u… more
Date: March 1, 1977
Creator: Creed, K. E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Potting of MC-1353 MATTA units in Lockfoam BX-105 B-10

Description: This program was initiated to develop a more reliable, practical method for potting MC-1353 Multiple Application Tube Transformer Assembly (MATTA) units in slow foaming Lockfoam BX-105 B-10. The study included volume determinations foam density measurements, foam time- temperature relationships, and exotherm effects on subassemblies.
Date: August 1, 1961
Creator: Creed, K.E. Jr.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Prototype casting fabrication by stereolithography

Description: A new product development technology is emerging which could have a major impact on the investment casting industry. It's identified by several names, the most common of which is STEREOLITHOGRAPHY.'' This technology involves a three-dimensional printing process which will yield plastic parts (polymer models) from solid, surface, or wireframe CAD files. The concept links a CAD database to a process which guides a laser beam to solidify liquid photo-curable polymer into a programmed shaped. The p… more
Date: November 1, 1990
Creator: Cromwell, W.E.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Thin Wall Iron Castings

Description: Results of an investigation made to develop methods of making iron castings having wall thicknesses as small as 2.5 mm in green sand molds are presented. It was found that thin wall ductile and compacted graphite iron castings can be made and have properties consistent with heavier castings. Green sand molding variables that affect casting dimensions were also identified.
Date: October 31, 2001
Creator: Cuttino, J.F.; Stefanescu, D.M. & Piwonka, T.S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Improved bondability of molded rigid urethane form by plasma treatment

Description: Most mold releases, including so-called nontransferring releases, interfere with bonding of molded urethane foam. Water-washable mold releases are not readily removable from urethane foams cured at elevated temperatures. Plasma treatment in either argon or oxygen improves the bonding surfaces of molded urethane foam. Comparable bonding results can be obtained with RF (13.6 MHz), AC (20 kHz), or DC-plasma treatments. The plasma-treated foam surfaces will retain the improved bondability for a con… more
Date: unknown
Creator: DeGisi, S. L. & Smith, C. H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

A Combined Experimental and Computational Approach for the Design of Mold Topography that Leads to Desired Ingot Surface and Microstructure in Aluminum Casting.

Description: A design methodology will be developed with which casting mold surface topographies can be tuned to produce required surface features and micro-structural properties of Aluminum ingots. Both static and continuous casting processes will be examined with instrumented molds. Mold surface topographies, which consist of unidirectional and bi-directional groove textures, will be generated using contact and non-contact techniques to elicit a radiator-like effect at the mold-casting interface. The rate… more
Date: October 30, 2005
Creator: Dr. Zabaras, N.J.; Samanta, D. & Tan, L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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