LITERATURE AND CURRENT EVENTS
Mining Engineering, v. 9; ~~ey~ca~ Institute of Mining and Me~al~uyg~calEngineers, Transactions, v. 208, Dec. 1957, p. 1356-1358. Describes a technique for recovery and separation of steel grinding balls and subsequent evaluation of the various compositions of the balls. The procedure involves thermal-neutron irradiation activation of each group of test balls to a different level of specific radioactivity, addition of groups of the radioactive balls into a ball mill, recovery of the radioh.
VOL. 1 (1957f58)
active specimens from the bulk of the mill charge, separation of the various groups by their specific radioactivity, and evaluation of actual grinding ball wear. Experiments Using a Simple Thermal Comparator for Measurement of Thermal Conductivity, Surface Roughness and Thickness of Foils or of Surface Deposits. R. I\‘. Powell. Journal of Scientific InstwmPnts, v. 34, Dec. ‘957, p. 485-492.
RESISTANCE OF MATERIALS
Investigation of Wear Qualities of Finished Hydraulic Concretes. (in Russian) V. fa. Gorenbein, Beton i ZfaeEezobeion, 15)s~. no. IO, Oct., p. 4’3-415. Determination of predominant causes in wearing away of finished concrete, and an attempt to eliminate them. Autogenes Panzern von Verschleissteilen unter besonderer Beriicksichtigung von Drehwerkzeugen. The Use of the Oxy-Acetylene Process for Hard Surfacing Parts Subjected to Wear,
With I’articular Reference to Lathe Tools. Gris, Siebel, and Fleck. Schweisses ~?~~Sc~~e~den, v. 9. no. II, NOV. It)j7, p, 473 + 9 pages. Application of hard surfacing, life of hard surfaced lathe tools and forged high-speedsteel tools. Economic considerations. Wear of Refractory Material in Various Zones of Blast Furnace. (in Russian) 0. M. Margulis and E. A. Giniar. Ugneupory, v. 22, no. 12, 1957, p. 549-556. Suggestion for the improvement of the shape and composition of blast furnace lining bricks.
7. SuRFAcEs AND SURFACE TREATMENT 7~1. Genemi Einfiuss von ~igens~annungen in gehsrteten WerkzeugstPhIen auf die Entstehung van Schteifrissen. Effect of Internal Stresses in Hardened Tool Steels on the Development of Grinding Cracks. Hans Biihler and Walter Schepp. Stahl cwtd Eisen, v. 77, no. 23, Nov. 14, 7957. p. 16861690. Distribution of internal stresses in cylindrical specimens which were partly quenched in water from different temperatures, taken from alloy steels containing: 0.05% C and 173; Xi, I 74 C and 1.5% Cr, as well as from plain carbon tool steels containing I”/:, and 1‘31:) C.. 6ber die Mikrohiirte von GlasoberfEichen. The Microhardness of Glass Surfaces. Peter Joos. Zeifschrift fiiv Angewandte Plzysik, v. 9, no. II, Nov. 1957, p. 556-561. Surface-scratching tests were comp”red for glasses when the scratch process takes place in a wet atmosphere or in a high vacuum. X plastic deformation results in the first case, a pure embrittlement in the second.
Le broyage des Cchantillons d’analyse. The Grinding of Samples in Ceramic hnalysis. P. Draignand. Indwlrie C.&anzipe, 1957. no. 491-a l)ec., p. 343-349. Preparation of samples, nature of materials.
Duration of the grinding process, different types of grinding equipment. Impurities resulting from grinding. Factors That Affect the Performance of Coated Abrasives. S. I,. Johnson. Tooling and Production, v. 23, Jan. 1958. p. 87-90. Taking the Guesswork Out of Grinding and Polishing With Abrasive Belts. Warren K. Seward. Plating. v. 45. Jan. 1958, P. 39-44. Belt speed recommendations for grinding and polishing various types of materials. Lubrication of abrasive belts; operating techniques; improving the final finish. 7.3. Cbalrilzg and Fi*tishing Polishing Atuminium and Its Alloys. Details of a New Chemical Process. W. K. Bates and C. I). Coppard. Metal FGtishing Jouwtal, v. 4. Jan. 1958, p. 5 + 6 pages. Phosbrite I ~(3removes metal selectively from the highspots and without forming definable etch patterns. Liquid vs. Bar Buffing Compound. E. 1‘. (‘andee. PlaZi+zg, v. 45, Jan. 1958, p. 35-38. Liquid buffing compounds have advantages from a production standpoint and can be more economical than bars.