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1–10 of about 546 matches for molding materials processes
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RECENT DEVELOPMENTS IN MOLDING PROCESSES AND MATERIALS (19730296)
Indian Foundry Journal (Feb. 1973), p. 35-38
This paper refers to the developments of various molding materials and processes for the production of quality castings in an economical manner and at a high production rate. Discusses new molding materials such as chromite and olivine, die casting of ferrous metals, fluid sand process, non-nitrogenous resins, Acurad processes. In a recent work carried out at I.I.T., Madras, it has been found that all the sand properties are related to the "effective surface area" of the sand grains. This takes into account the size distribution and surface area of the grains. This parameter seems to hold great promise for the green sand systems in evaluating the properties, by knowing the size distribution and surface area, from the standard graphs. An effective breakdown agent has been developed by BNFMRA for the CO2 process. This they have used with success in many castings. It has been reported that its bench life is in excess of 2 hours, and can be stored in polythene bags for a week.

STEEL FOUNDRY MOLDING MATERIALS (19700758)
The British Foundryman (July 1970), p. 207-223
Steel foundry molding materials generally have similar molding and core-making properties to those used in founding other metals, the main different being that they must be able to withstand the higher temperatures associated with the pouring of steel. Since there is a wide variety of sizes, designs and compositions of steel castings the molding material will vary according to the specific requirements of the casting. A continuing trend in steel casting production is towards higher quality and greater productivity, hence steel foundrymen have not been slow to apply new molding materials and processes if they assist them to accomplish these aims. This paper surveys the molding and coremaking materials employed in steel foundries with particular emphasis on the properties that make them suitable for this purpose. Most steel foundries therefore use a washed and dried silica sand of High cleanliness and purity. While it is difficult to state exact chemical compositional limits it is generally held that a silica sand for steel foundry work should contain more than 96% Si02. Furthermore, the alkali bearing silicates such as felspars and micas, etc., which are easily fusible, should be present only in small amounts. In a good silica sand the alkalis Na20 and K20 should therefore not total more than 1%. Refractory sands, e.g. zircon, chromite and olivine are therefore now widely used as molding media in steel foundries.

RESULTS FROM SEMI-INDUSTRIAL STUDIES ON “TEMPERING OF BENTONITE-BONDED CIRCULATING MOLDING MATERIALS” (20050293)
66th World Foundry Congress, Istanbul, September 6 – 9, 2004
The EIRICH test center provides all preconditions for a comparative study of molding sand preparation with both conventional and EVACTHERM® preparation processes. In the course of these test series, the maturing effect on bentonite-bonded molding material was examined. The tests demonstrate the influence of the maturing process through premoistening before the preparation and the ageing effect of the prepared sand after preparation. In the end, the values measured in the test center were compared to values from practical experience of production plants.

MOLDING AND COREMAKING PROCESSES - - SELF-SETTING (19790651)
Proceedings of the BCIRA International Conference: Foundry Technology for the 80's. University of Warwick, England. April 3-5, 1979. Paper No. 10. 15 pages
Organic and inorganic self-setting molding and coremaking processes and the developments which had promoted their widespread adoption are reviewed. In the 80's, more advanced screw-feed machines, computer control of mixing formulation and timing, and closely controlled warm sand will be seen. Plants will increasingly be automatic, fully enclosed and ventilated. Organic binding systems, now chemicals producing resins or urethanes cured fast by highly reactive catalysts, still needed improvement in gas evolutions and problems of finning and pinholes. Environmental problems require attention to ventilation, dumping of spent molding materials, and education of staff. Inorganic systems, more acceptable environmentally, often justify their higher cost, and for cement binders costs need not be high. Self-setting challenged by other systems. silicates are fumefree and flexible in operation, with scope for improvement in physical pro-perties and in reclamation, though being

MOLDING MATERIALS - THE NEXT 25 YEARS (19720101)
The British Foundryman, Nov. 1971, p. 423-429
The present paper is divided into two sections, the first is aimed at putting the present position into perspective, and the second looks into the future and predicts what will be the developments in materials during the next 25 years. In repetition foundries green sand molding with silica sand and bentonite will continue to be the principal molding process. The use of high pressure squeeze molding will increase and will become the accepted method of producing repetition ferrous castings in the small and medium size range. In the next decade those processes in which cores are stripped from the box prior to hardening will be almost entirely eliminated. These processes will be replaced by the hot-box, shell core, or silicate/CO2 processes but side by side with this will be the development of cold or low temperature curing organic binders and silicate bonders with considerably improved strength and good breakdown characteristics. Further possibilities are the development of a process using a non-toxic gas or the development of binders that can be cured in the core-box by such methods as microwave absorption or dielectric heating.

LOOKING BEYOND HYPE WHEN SELECTING MATERIALS (20061799)
Engineered Casting Solutions V 8 N 3 P 38-39, May/Jun 2006 (2 p)
Designers and product engineers are continually challenged to make components lighter and stronger while reducing costs. Material selection has become a critical element needed to achieve these objectives. It’s not all about “nano” materials. For example, a wheel hub produced in austempered ductile iron (ADI) reduced weight by 3% with a 30% cost savings as compared to a previous generation aluminum design. Aluminum does not dampen vibrations like cast iron and efforts to reduce noise and vibration problems with the aluminum block resulted in only a marginal weight savings. The true challenge is to select the right material – not just the most fashionable.

ACTUAL STATE OF TECHNICS AND CRITERIA OF DEVELOPMENT OF MOULDING MATERIALS IN THE FEDERAL REPUBLIC OF GERMANY (19790578)
Giesserei, 65(21), 1978, p. 571-578, 23 pages Translation available from AFS @$33.60 BISI No. 18022
The forming of molten metal is the most expensive and costly production stage in the manufacturing of castings and 60% to 80%: of these costs are due to the molding process. In technical discussions on the necessities and possibilities of humanizing the working life in the foundry industry scientists and practical people have worked out an urgency catalog of projects which are worth promoting including dust and noise prevention and new molding technology. In the second half of 1975, the German Foundrymen's Association carried out an enquiry on the trend developing in molding processes. In 1977, a supplementary enquiry on the trend developing in the coremaking processes followed it. The aim of the enquiries was to gain insight into the present proportion of use of the various molding materials and production processes, how the development trend is judged by the factories, especially with regard to work safety, environment, and relief from worry.

Guide to Casting and Molding Processes (20090307)
MetalCasting Design & Purchasing, 2009 Casting Source Directory, P 6-12
The versatility of metal-casting is demonstrated by the number of casting and molding processes currently available. This range of choices offers design engineers and component users flexibility in their metalforming needs. Each process offers advantages when matched with the proper alloy and application. When reviewing these processes and determining which best suits your needs, consider the following: required surface quality; required dimensional accuracy; type of pattern/corebox equipment; cost of making the mold(s); and how the selected casting process will affect casting design. Molding processes can be broken into four general categories: sand casting processes; permanent mold processes; ceramic processes; and rapid prototyping. Following is a look at the most common casting processes.

CASTING EMISSIONS REDUCTION PROGRAM (CERP) (19970647)
Transactions of the American Foundrymen's Society V 104 Paper 96-99 P 539-543, 1996 (5 p)
CERP is a national program to improve and/or develop new materials and processes in foundry technologies that will allow the U.S. casting industry to be competitive, while working to achieve a near-zero effect on the environment. This paper presents the basic organization structure, timing and programs of CERP. A pilot, pre-production research and development foundry has been built at McClellan Air Force Base in Sacramento, California. This facility simulates a high-volume production foundry, while allowing the accurate collection of emission and processing data.

1–10 of about 546 matches for molding materials processes
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