Hammer forging

Pinit, n. pinitol, (less correctly) pinite. pinkeln, v.i. piddle, putter, pinken, v.t. treat with pink salt hammer, forge. 

Foiging. IVansage 175 has excellent forgeability. It has near-net-shape and net-shape capabilities by isothermal forging at temperatures as low as 650 °C (1200 °F). However, considering relevant factors such as load requirements, die hfe, and uniformity of mechanical properties, the opti-mtxm parameters are a temperature of 815 °C (1500 °F) and a platen speed of 0.21 mm/s (0.5 in./min). In hammer forging, the workpiece temperature should not fall below 700 °C (1300 °F). 

The ingots were hammer forged tol Ae-in. diameter bars at an initial temperature of 1150 to 1170 C (2100 to 2140 F). The steels hot-worked readily and were free from edge or surface cracks. The bars were cut into specimen slugs, solution heat-treated for 1 hr at 1008 C (1850 F) and air cooled. The compositions of the steels obtained are given in Table I. 

Forgings are produced by pressing or hammering ingots or billets either into simple shapes on flat dies or into complex shapes in cavity dies. Several sets of dies may be employed in arriving at the final shape. Equipment varies from simple drop hammers and mechanical presses to large hydrauHc presses. 

Hammer-schlacke,/. hammer scale, forge scale, -schlag, m. hammer scale, forge scale hammer blow, -werk, n. hammer mill. 

Kaltguss, m. spoiled casting, kaltliammerbar, a. malleable, kalthkmmem, v.t. cold-hammer, cold-forge. Kalt-hefe,/. wild yeast, -lack, m. cold varnish. 

Figure 7.9 Schematic illustration of a single frame steam forging hammer. Reprinted, by permission, from Doyle, L.E., Manufacturing Processes and Materials for Engineers, 2nd ed., p. 254. Copyright 1969 by Prentice-Hall, Inc.

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