File:A general description of the methods and processes involved in the manufacture of brass goods (1907) (14783360652).jpg

Identifier: generaldescripti00gree (find matches)
Title: A general description of the methods and processes involved in the manufacture of brass goods
Year: 1907 (1900s)
Authors: Greenman, Edwin Gardner
Subjects: Brass industry and trade Brass industry and trade Brass industry and trade Theses
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Contributing Library: University of Illinois Urbana-Champaign
Digitizing Sponsor: University of Illinois Urbana-Champaign

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and the other closed up. In this manner the lining may be wellburned out all around before it need be renewed. The renewalis accomplished by taking out one head and knocking out the liningand then building in, beginning v/ith the head left in. Onelining will stand about ^2 heats or at heats per day about12 days work. The curves s^own on T)age 24 represent the temperature in sucha fiirnace as talien v/ith an optical pyrometer. The heavy linerepresents actual readings taken at ten minute intervals throughthe charging hole vith the blast turned off and the light linerepresents the probable average temperature of the metal. A rotary blower gives sufficient blast for these furnacesalthough compressed air can also be used with good results. Coke furnaces are still used more or less for snail chargesof metal and for special mixtures but a sm.all crucible oil fur-nace, similar to the 3teele-Harvey , m.anufactured by The MonarchEngineering and Mfg. Co., is much rxore economical and convenient.
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jiwtVTR UNOIS. / The v/hole question of different mixtures suitable for valve wor^-is too broad for discussion here but o few practical points v/illbo mentioned. The standard U. .j. i;avy Com.position, .^ per centof Copper, 10 per cent of Tin, and 2 per cent of Zinc, is as(^ood a m.ixture for valve work as is knovfn but it is an expensivemixture because of the lar.^e percentage of tin, aTid its toughnessmakes it very hard to machine. A very good steam metal can bemade of R? per cent of Copper,- ^ per cent of Tin, 5 per cent ofZinc, and 2 per cent of Lead. This metal is easy to machine,has a tensile strength of over thirty thousand pounds per squareinch and is considerably cheaper than the navy mixture. Thismetal is suitable for valve bodies,and trimmings in which strengthis required, such as yokes and stems. For valve trimmings asomewhat poorer mixture is lust as efficient and will reduce theCost appreciably. A good trimming mixture would be about ^^ percent of Copper, to 4 1/2 per ce

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