. The Bell System technical journal . ter according to the pounds pullrequired, they are matched into sets for use in the No. 2 drawing are kept of the characteristics and output of each die. The increase in speeds up to 12,000 does not appear to have anappreciable effect on die wear. In other words, the same quality and 112 BELL SYSTEM TECHNICAL JOURNAL quantity of wire can be obtained from high speeds as from low speeds if(1) the dies are made to definite specifications, (2) the dies are matched intosets, and (3) the drawing machine factors are the same. The drawing m
. The Bell System technical journal . ter according to the pounds pullrequired, they are matched into sets for use in the No. 2 drawing are kept of the characteristics and output of each die. The increase in speeds up to 12,000 does not appear to have anappreciable effect on die wear. In other words, the same quality and 112 BELL SYSTEM TECHNICAL JOURNAL quantity of wire can be obtained from high speeds as from low speeds if(1) the dies are made to definite specifications, (2) the dies are matched intosets, and (3) the drawing machine factors are the same. The drawing machines have been designed and are maintained with theview of overcoming some of the serious causes of short die life. Long dielife is not only obtained by good die shop practice but also control of thefollowing machine factors; (1) smooth drawing capstans and minimumslip, (2) minimum whip of wire entering dies, (3) adequate lubrication ofcapstans and cooling of dies, and (4) elimination of foreign particles fromthe drawing Fig. 17—Schematic showing cross-section of diamond die used in high speed wire drawing Drawing Compound and Equipment A one-story building is used for manufacturing wire. In the basementthe drawing compound tanks, piping, heat exchangers, pumps, power serv-ices and controls are installed. The compound solution used to lubricateand cool the capstans and dies in the drawing machines consists of a homo-genized solution of soap, fat and oil mixed with water. This compoundreturns to a self-cleaning distributing launder in an enclosed steel launder consists of a pipe with slots evenly depositing the compoundover the entire width of the tank. The copper sludge settles to the bottomand the lighter impurities rise to the surface to be held back by a skimmerplate. The clarified super-natant solution rises over a dam into the pumpsuction chamber to be pumped at the rate of 200 gallons per minute to eachNo. 1 machine and 100 gallons per minute to e
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
