Hardening, tempering, annealing and forging of steel; a treatise on the practical treatment and working of high and low grade steel .. . IflG. 114-—COMBINATION DIES, WITH HARDENED AND GROUND TOOLSTEEL WORKING PARTS SOLID-FORGED TO WROUGHT-IRON PLATES. from the bottom upward. When the die is to be quenched thewater should be turned on and kept running until the steel hascooled. When a good circulation of water is kept up in the tankthere will not be any soft spots in the die after hardening. It is often necessary to construct dies from forgings ofwrought iron and tool steel, and, as the dies wh
Hardening, tempering, annealing and forging of steel; a treatise on the practical treatment and working of high and low grade steel .. . IflG. 114-—COMBINATION DIES, WITH HARDENED AND GROUND TOOLSTEEL WORKING PARTS SOLID-FORGED TO WROUGHT-IRON PLATES. from the bottom upward. When the die is to be quenched thewater should be turned on and kept running until the steel hascooled. When a good circulation of water is kept up in the tankthere will not be any soft spots in the die after hardening. It is often necessary to construct dies from forgings ofwrought iron and tool steel, and, as the dies when finished arerequired to be hardened, it is necessary there should be a goodweld between the two parts. To accomplish this result, whenwelding mix mild steel chips, from which all of the oil has been THE HARDENING AND TEMPERING OF DIES. 163 removed, with the borax and there will be no difficulty in produc-ing a clean weld and one which will not buckle or separate inhardening. Hard or Soft Punches and times, when tools are required for sheet-metal working,it is hard to determine whether a punch and die should be hard-en
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