. The Bell System technical journal . 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 Die Size1 2 3 4 5 6 7 8 9 to n 12 13 14 15 (6 (7 18 RtouciioN Fig. 18 Figure 18 illustrates the results obtained when drawing annealedwire with reductions. The large margin of safety betweenthe pull required and the breaking strength of the material again dis-appears after two reductions. Fig. 19 illustrates practical drawing Slight irregularities in the curves are clue to variations from the mean in thediameters of the dies used during the test. DEVELOPMENTS IN MANUFACTURE OF COPPER WIRE 209
. The Bell System technical journal . 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 Die Size1 2 3 4 5 6 7 8 9 to n 12 13 14 15 (6 (7 18 RtouciioN Fig. 18 Figure 18 illustrates the results obtained when drawing annealedwire with reductions. The large margin of safety betweenthe pull required and the breaking strength of the material again dis-appears after two reductions. Fig. 19 illustrates practical drawing Slight irregularities in the curves are clue to variations from the mean in thediameters of the dies used during the test. DEVELOPMENTS IN MANUFACTURE OF COPPER WIRE 209 conditions adopted for drawing wire to finished sizes without anneaUngduring the process. 20 Use. \5 Lbs. 10 Lbs. 5 Las. 0 ^ 22 23 2* 25 26 27 28 29 JO 31 3Z 33 34 35 J6 37 38 39 40 On Sue 2 3 4 5 6 7 6 9 10 H IM3 14 15 16 17 16 RtpucTioN Fig. 19 Chilled Iron DiesThe dies used for drawing heavy wire are cast with a tapered holefrom chilled cast iron and reamed to the desired size. When the diewears too large for a particular size of wire, it is reamed to a larger sizeand used in that manner until the die goes above the maximum sizeused. These dies, shown in Fig. 20, are used for drawing line and heavygauge wire for which the cost of diamond dies would be alloy steel dies have been tested as substitutes for chilled irondies for copper wire drawing, but so far have failed to replace them, due 210 BELL SYSTEM TECHNICAL JOURNAL to excessive cost. For the wire sizes smaller than No. 16 down to asfine as No. 42 B. & S., diamond dies as described below are used.
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