Copyright, 1925, by the AMERICAN FOUNDRY MEN'S ASSOCIATION (INCORPORATED) PRINTED IN THE UNITED STATES OF AMERICA 355956 The AMERICAN FOUNDRYMEN'S ASSOCIATION as a body is not responsible Contents Molding Sand Reclamation and Control Experiments (with discussion). 1 A New Method of Measuring the Hardness of Molds... Commercial Application of Molding Sand Testing (with discussion).. 24 A Study of the Effect of Heat on the Clay Content of Molding Sands A Study of Molding Sand Mixtures and Molds and Castings Produced 98 OF THE American Foundrymen's Association INCORPORATED President L. W. OLSON Vice President A. B. ROOT, JR. Secretary-Treasurer C. E. HOYT Marquette Bldg., MEMBERS OF THE BOARD OF DIRECTORS (In addition to the above) Reclamation and F. L. Wolf and A. A. Grubb, MANSFIELD, О!ợ Late in 1922 The Ohio Brass Company started experiments with a view to reclaiming waste sands which were passing from their brass foundry to the dump. An account of the preliminary work and first practical trials were given in a report entitled "Brass Molding Sand Reclamation and Conservation Experiments," at the Cleveland Convention of this Association in 1923. Two molding floors were operated entirely on reclaimed sand during the following summer, and, with other floors operated on new sands, were carefully observed. An account of these trials and observations was reported to the committee in October, 1923. The present paper deals with further experiments along this line, the extension of reclamation work and sand control methods to our entire brass foundry and the effect on molding losses. Reclamation Experiments The refuse sand which we have been reclaiming consists of the fine material from foundry floor sweepings. The cores, core wires, scrap brass and spillings are hand picked and screened out with aid of an eight mesh screen. About 260 pounds of this fine material are produced each week by each floor. It has a bond value of about 135, a figure entirely too low for molding purposes. In our first experiments at reclaiming this sand, it was mixed with fine medium bond sand from Northern Ohio. This served to build up its bond but also tightened the sand. The grain size was too small. A high bond but larger grained material was needed. The Gallia County (Ohio) red sands offered 1Transactions A. F. A., Vol. 31, pp. 649-655. Bulletin A. F. A., Vol. 3, January, 1924, pp. 19-21. |