Download or read book Gating of Permanent Molds for Aluminum Casting written by John F. Wallace and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This report summarizes a two-year project, DE-FC07-011D13983 that concerns the gating of aluminum castings in permanent molds. The main goal of the project is to improve the quality of aluminum castings produced in permanent molds. The approach taken was to determine how the vertical type gating systems used for permanent mold castings can be designed to fill the mold cavity with a minimum of damage to the quality of the resulting casting. It is evident that somewhat different systems are preferred for different shapes and sizes of aluminum castings. The main problems caused by improper gating are entrained aluminum oxide films and entrapped gas. The project highlights the characteristic features of gating systems used in permanent mold aluminum foundries and recommends gating procedures designed to avoid common defects. The study also provides direct evidence on the filling pattern and heat flow behavior in permanent mold castings. Equipment and procedure for real time X-Ray radiography of molten aluminum flow into permanent molds have been developed. Other studies have been conducted using water flow and behavior of liquid aluminum in sand mold using real time photography. This investigation utilizes graphite molds transparent to X-Rays making it possible to observe the flow pattern through a number of vertically oriented grating systems. These have included systems that are choked at the base of a rounded vertical sprue and vertical gating systems with a variety of different ingates into the bottom of a mold cavity. These systems have also been changed to include gating systems with vertical and horizontal gate configurations. Several conclusions can be derived from this study. A sprue-well, as designed in these experiments, does not eliminate the vena contracta. Because of the swirling at the sprue-base, the circulating metal begins to push the entering metal stream toward the open runner mitigating the intended effect of the sprue-well. Improved designs of sprue-wells should be evaluated. In order for a runner extension to operate efficiently, it must have a small squared cross-section. If it is tapered, the first metal to enter the first metal to enter the system is not effectively trapped. If the cross section is large, there is less turbulence when the aluminum enters the mold cavity in comparison to the smaller cross sectioned, squared runner. However, a large runner reduces yield. In bottom-feeding gating systems, a filter can significantly improve the filling of the casting. The filter helps to slow the metal flow rate enough to reduce jetting into the mold cavity. In top feeding gating systems, a filter can initially slow the metal flow rate, but because the metal drops after passing the filter, high velocities are achieved during free fall when a filter is in place. Side feeding gating systems provide less turbulent flow into the mold cavity. The flow is comparable to a bottom-feeding gating system with a filter. Using properly designed side-gating system instead of a bottom-feeding system with a filter can potentially save the cost of the filter. Rough coatings promote better fill than smooth coatings. This conclusion seems at first counter intuitive. One tends to assume a rough coating creates more friction resistance to the flow of molten metal. In actuality the molten aluminum stream flows inside an oxide film envelope. When this film rests on top of the ridges of a rough coating the microscopic air pockets between the coating and the oxide film provide more thermal insulation than in a smooth coating. This insulation promotes longer feeding distances in the mold as demonstrated in the experiments. Much of this work is applicable to vertically parted sand molds as well, although the heat transfer conditions do vary from a metal mold generally used in permanent molding of aluminum. The flow measurements were conducted using graphite molds and real time X-Ray radiography recorded at a rate of 30 images per second through those molds. The facilities at Arrow Aluminum Foundry were used in the study. The results will be employed to demonstrate to the American Foundry Industry how molten aluminum flows in permanent molds of different designs and characteristics. The results of these experiments were compared with computer mold and simulation models. The Procast and Magmasoft flow and solidification simulation programs were employed to predict the flow behavior under the different conditions that can prevail in permanent mold gating. The development of a valid computer model that can correctly and accurately predict this flow is much more intricate than generally realized. To provide accurate predictions such programs require significant adjustments and verification with experimental data.
Download or read book Gating of Permanent Molds for ALuminum Casting written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This report summarizes a two-year project, DE-FC07-01ID13983 that concerns the gating of aluminum castings in permanent molds. The main goal of the project is to improve the quality of aluminum castings produced in permanent molds. The approach taken was determine how the vertical type gating systems used for permanent mold castings can be designed to fill the mold cavity with a minimum of damage to the quality of the resulting casting. It is evident that somewhat different systems are preferred for different shapes and sizes of aluminum castings. The main problems caused by improper gating are entrained aluminum oxide films and entrapped gas. The project highlights the characteristic features of gating systems used in permanent mold aluminum foundries and recommends gating procedures designed to avoid common defects. The study also provides direct evidence on the filling pattern and heat flow behavior in permanent mold castings.
Download or read book Aluminum Casting Technology written by John L. Jorstad and published by . This book was released on 1993 with total page 376 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Aluminium Castings Engineering Guide written by Jagan Nath and published by ASM International. This book was released on 2018 with total page 301 pages. Available in PDF, EPUB and Kindle. Book excerpt: This practical guide to product and process engineering of various aluminum castings emphasizes process and material characteristics; product-process-alloy integration; manufacturing aspects of aluminum casting; product design features; tooling design, feeding and gating design; product quality needs and specifications; product launches; and successful conversions of aluminum from steel and iron.
Download or read book Aluminum Alloy Castings written by John Gilbert Kaufman and published by ASM International. This book was released on 2004-01-01 with total page 350 pages. Available in PDF, EPUB and Kindle. Book excerpt: J. G. (Gil) Kaufman is currently president of his consulting company, Kaufman Associates.
Download or read book The Effect of Gating on Soundness of Al alloy Permanent Mold Castings written by Dinesh Shantilal Patel and published by . This book was released on 1973 with total page 63 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Science and Technology of Casting Processes written by Malur Srinivasan and published by BoD – Books on Demand. This book was released on 2012-09-26 with total page 362 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book deals with various science and technology factors that need careful consideration in producing a casting. It consists of 11 chapters contributed by experts in their respective fields. The topics include simulation of continuous casting process, control of solidification of continuous castings, influence of mold flux in continuous casting, segregation in strip casting of steel, developments in shell and solid investment mold processes, innovative pressure control during filling of sand molds, fracture toughness specifically of castings, permanent molding of cast iron, wear resistant castings and improvement of accuracy in estimating graphite nodularity in ductile iron castings.
Download or read book Handbook of Aluminum written by George E. Totten and published by CRC Press. This book was released on 2003-03-27 with total page 1318 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Handbook of Aluminum: Vol. 1: Physical Metallurgy and Processes covers all aspects of the physical metallurgy, analytical techniques, and processing of aluminium, including hardening, annealing, aging, property prediction, corrosion, residual stress and distortion, welding, casting, forging, molten metal processing, machining, rolling, and extrusion. It also features an extensive, chapter-length consideration of quenching.
Download or read book Fundamentals of Modern Manufacturing written by Mikell P. Groover and published by John Wiley & Sons. This book was released on 2010-01-07 with total page 1027 pages. Available in PDF, EPUB and Kindle. Book excerpt: Engineers rely on Groover because of the book’s quantitative and engineering-oriented approach that provides more equations and numerical problem exercises. The fourth edition introduces more modern topics, including new materials, processes and systems. End of chapter problems are also thoroughly revised to make the material more relevant. Several figures have been enhanced to significantly improve the quality of artwork. All of these changes will help engineers better understand the topic and how to apply it in the field.
Download or read book Physical and Numerical Simulation of Materials Processing written by Ji Tai Niu and published by Trans Tech Publications Ltd. This book was released on 2008-04-08 with total page 1570 pages. Available in PDF, EPUB and Kindle. Book excerpt: This specialist work comprises 249 peer-reviewed papers on the Physical and Numerical Simulation of Materials Processing.
Download or read book Process Development for a Permanent Mold Aluminum Casting written by Sivaram P. Alapati and published by . This book was released on 1991 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Casting Design and Performance written by and published by ASM International. This book was released on 2009 with total page 271 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Aluminum and Aluminum Alloys written by Joseph R. Davis and published by ASM International. This book was released on 1993-01-01 with total page 802 pages. Available in PDF, EPUB and Kindle. Book excerpt: This one-stop reference is a tremendous value and time saver for engineers, designers and researchers. Emerging technologies, including aluminum metal-matrix composites, are combined with all the essential aluminum information from the ASM Handbook series (with updated statistical information).
Download or read book Proceedings of the 4th International Conference on Permanent Mold Casting of Aluminum written by and published by . This book was released on 1997 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Aluminum Permanent Mold Handbook written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Permanent mold aluminum castings and their field of usefulness written by Chaffe, jr and published by . This book was released on 1925 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt:
