Hardening, tempering, annealing and forging of steel; a treatise on the practical treatment and working of high and low grade steel .. . l careis necessary. Instead of plunging the whole die into the quench- 164 HARDENING, TEMPERING AND ANNEALING. ing bath (when heated properly) set it in an inclined positionand direct a strong stream of cold water onto the face of the having the stream strong the whole die face will be covered,and the contraction of the metal at the surface will be the water to strike the die until the bath ceases to boil,and then gradually diminish the str
Hardening, tempering, annealing and forging of steel; a treatise on the practical treatment and working of high and low grade steel .. . l careis necessary. Instead of plunging the whole die into the quench- 164 HARDENING, TEMPERING AND ANNEALING. ing bath (when heated properly) set it in an inclined positionand direct a strong stream of cold water onto the face of the having the stream strong the whole die face will be covered,and the contraction of the metal at the surface will be the water to strike the die until the bath ceases to boil,and then gradually diminish the stream and allow the die to coolslowly. By placing the die in the inclined position when hard-ening, the water will run off the face and thereby the bottom willremain soft and hot while the die portion proper will be hard,which is always a desirable condition in dies of this kind. Atthe same time the temper can be drawn by the heat remaining inthe base of the die. When the colors appear turn the water onuntil cool. When a muffle is used to heat steel parts for hardening, pro-vide a number of 3-16-inch rods. Put them in with the steel. Redrawing Punch. Inside Blank Holder. Redrawing Die PIG. 117.—REDRAWING DIE WITH INSIDE BLANK HOLDER. and remove one from time to time during the heating processto test the temperature. To anneal white or hard iron die parts so that they may bemachined with ease, put the parts into an iron box and packaround them a mixture composed of equal parts of commonsand, fine steel turnings and steel scale from the rolling the mixture with the solution of sal-ammoniac, after whichplace the box in a furnace and heat to a white heat. Keep theheat for five or six hours, and then allow the box to cool cool remove the castings and they will be found to bemalleable enough to allow of cutting them. The packing of themixture mentioned above and the wetting of it with the solutioncontributes to the annealing, and allows of the castings or partsc
Size: 3366px × 742px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookidhardeningtem, bookyear1903
