. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . Fig. 3.—The Simonds metal rolling macMne. by means of suitable fixtures, are a number of rollers, arranged to act as front, rear, andside supports and guides to cast-iron traveling platens, 0 0. They thus take the place of the ordinary slidingsurfaces, and, affordingonly rolling contact, re-duce friction. Fittedinto the backs of theseplatens are racks whichengage with suitable me-chanism, so that one ofthe platens a
. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . Fig. 3.—The Simonds metal rolling macMne. by means of suitable fixtures, are a number of rollers, arranged to act as front, rear, andside supports and guides to cast-iron traveling platens, 0 0. They thus take the place of the ordinary slidingsurfaces, and, affordingonly rolling contact, re-duce friction. Fittedinto the backs of theseplatens are racks whichengage with suitable me-chanism, so that one ofthe platens always travelsupward, while tlie othertravels downward. The platens, 0 0, carry iron plates, into which the dies proper are Fig. 4.—Die for car axle. dovetailed, the .section. 746 ROLLS, METAL WORKING. of these for this purpose being as shown in Fig. 4. The die there illustrated is for forgingcar axles, of one of which a sketch is also given. The dies are iisod in pairs, moved in oppositedirections over the metal to be shaped, the die surfaces, of course, being exactly the plane faces of the dies, which lie parallel to each other when in position forwork, rise the forming and reducing and spreading surfaces, the plane portions servingto su|)port and steady the work and prevent it from rocking. The reducing surfaces aregrooved or serrated, in order to insure a firm grip on the hot and plastic metal, and perfectregularity in its rotation, and being thus arranged obliquely, the marks made in the metalby the serrations are ol)literated in subsequent revolutions of the blank, and the rate of thesurface movement of the latter, wliere work is being ])erformed, is the same as the rate oflinear movement of the dies. The reducing faces commence to work on
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Keywords: ., bookcentury1800, bookdecade189, booksubjectmechanicalengineering
