Hardening, tempering, annealing and forging of steel; a treatise on the practical treatment and working of high and low grade steel .. . ugs, P, which are inserted and withdrawn by the cast iron car-riers, D. As their name indicates they are mainly used for theprocess of case-hardening in cast-iron boxes, but also for anneal-ing heavy steel dies, hubs, tool steel, etc. The slab which dividesthe combustion chamber from the heating chamber is heavier thanin oven furnaces, properly supported by brickwork to bear heavyweights, and cast-iron rails are placed over the slab on which theboxes are remo
Hardening, tempering, annealing and forging of steel; a treatise on the practical treatment and working of high and low grade steel .. . ugs, P, which are inserted and withdrawn by the cast iron car-riers, D. As their name indicates they are mainly used for theprocess of case-hardening in cast-iron boxes, but also for anneal-ing heavy steel dies, hubs, tool steel, etc. The slab which dividesthe combustion chamber from the heating chamber is heavier thanin oven furnaces, properly supported by brickwork to bear heavyweights, and cast-iron rails are placed over the slab on which theboxes are removed in and out. The burners, B, cover the whole length of the heating space;the opposite burners are connected to one gas and one air valve, 68 HARDENING^ TEMPERING AND ANNEALING. which control the supply. The door plug, P, is of the exact sizeand thickness of the entrance, so that it can be easily inserted orremoved by cast-iron skeleton door, D. The advantages of gas blast case-hardening furnaces are thatthey do work more quickly and thoroughly than in the best ofcoal ovtos in use, because from the beginning of the operation all. FIG. 37.—CASE-HARDENING FURNACE. the boxes inserted—and all parts of each box—are heated sim-ultaneously and alike, and that the heat can be kept constant at themaximum degree which the cast-iron boxes will stand. Theseadvantages shorten the process materially, and when once thetime required for a given amount and kind of work has been as-certained, the same result can be produced thereafter, in the sametime. HEATING STEEL GAS BLAST FURNACES. 6q ^Heating Machine for Hardening the Edges of Mozver machine shown in Fig. 39 is used for hardening the edgesof mower blades, and will operate as fast as the blades can bedropped into the jaws of the link belt K at I. The jaws are soformed as to expose only the edge of the blade as far as it is to behardened, to the action of the heat, while the body of the blade is
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Keywords: ., bookcentury1900, bookdecade1900, bookidhardeningtem, bookyear1903
