Hardening, tempering, annealing and forging of steel; a treatise on the practical treatment and working of high and low grade steel .. . FIG. 133.—SPECIAL, DROP-FORGING. sary to remove the surplus metal thrown out between the forg-ing dies in working. Before using the finished set of dies for forging, a lead proofis struck up which is submitted to the customer. The proof often FORGING AND WELDING. IQI varies from the model or drawing by what is called draft. Thisis the taper necessary on the forgings to allow of drawing themfrom the dies while working, and it averages about seven ca
Hardening, tempering, annealing and forging of steel; a treatise on the practical treatment and working of high and low grade steel .. . FIG. 133.—SPECIAL, DROP-FORGING. sary to remove the surplus metal thrown out between the forg-ing dies in working. Before using the finished set of dies for forging, a lead proofis struck up which is submitted to the customer. The proof often FORGING AND WELDING. IQI varies from the model or drawing by what is called draft. Thisis the taper necessary on the forgings to allow of drawing themfrom the dies while working, and it averages about seven can be obtained by adding to or taking from the forging;usually the draft metal is added. Establishments devoted exclusively to the manufacture of dropforgings carry a large and assorted stock of material from whichto make the forgings. But in new dies, where the size of metalrequired cannot be determined until they are tried in the hammer,delays in obtaining the right sizes sometimes occur. As poor ^-terial cannot be used, drop-forgings are, therefore, not onlysuperior to hand-forgings tfecause the metal is improved by the if.
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Keywords: ., bookcentury1900, bookdecade1900, bookidhardeningtem, bookyear1903
