Mining and Metallurgy Volume 2, No. 176 downloadPDF, EPUB, MOBI

Mining and Metallurgy Volume 2, No. 176 downloadPDF, EPUB, MOBI

Mining and Metallurgy Volume 2, No. 176.cAmerican Institute of Engineers

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Author: American Institute of Engineers
Number of Pages: 60 pages
Published Date: 01 Mar 2012
Publisher: Rarebooksclub.com
Publication Country: Miami Fl, United States
Language: English
ISBN: 9781130167658
File size: 38 Mb
Download Link: Mining and Metallurgy Volume 2, No. 176
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1921 Excerpt: ... size to a size corresponding to that produced at 1600. That the proper grain size desired is that produced at 1450. New York Meeting, February, 1921. This paper, which will be printed in Transactions, is reprinted from Iron Age (July 7, 1921), and will not be available in pamphlet form. That the bit is originally heated for 4 in. back from the cutting edge, that the hammering effect acts only to a point 3 in. back from the cutting edge, and that the hardening heat extends back only 1 in. from the cutting edge. Then, as a steel is taken from the fire, the grain condition is as shown in Fig. 1. After the forging operation has been performed a different condition Fig. 2.--Steel After Forging. A, B And C As In Fig. 1. D, SIZE OF GRAIN AT 1600 F., 3 IN. LONG PROM HAMMERING; THIS LEAVES C ONLY 1 IN. LONG WITH A SECTION OF CHANGE BETWEEN C AND D. Blank for ordering these papers is on page 37 Fig. 4.--Steel As It is Desired To Be When Ready For Use. exists, as is shown by Fig. 2. The heating operation to harden the cutting edge produces still another effect, as is shown in Fig. 3. The questions that naturally arise from this are: Will'the cost of the extra heat treatment necessary to change this condition (annealing) be more than the saving that may be effected in the drill steel or will the extra heating be an economical as well as a wise thing to do? Is this condition necessarily detrimental to the maximum service of the drill steel? Can this annealing action be obtained in the hardening heat by heating more of the bit, say at least 5 in., to the hardening temperature but quenching only, the end of the bit by a shallow immersion? Continued on page 36. ($ ACCOUNT of the unusual amount of unemployment and the desirability of reducing the time of correspondence for...

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