This new forge apparatus has been devised for the purpose of finishing
up round irons of all diameters while hot, as they come out of
the ordinary rolling mill, by rendering them perfectly circular,
cylindrical, straight, smooth, and level at the extremities, as if they
had passed through a slide lathe. Such a high degree of external finish
is a very valuable feature in those round irons that are employed in so
great quantity for shafting, cylindrical axles, etc., as well as in the
manufacture of bolts and locks. Figs. 1, 2, 3, and 4 of the opposite
engraving will allow it to be seen that this apparatus which is usually
installed at the side of the finishing cylinder is, in part, beneath
the general level of the forge floor. It may be placed parallel with or
perpendicular to the apparatus that it does duty for, this depending
upon the site at disposal or the mode of transmission.
The apparatus consists essentially of two tempered iron cylinders, A,
0.5 of a meter in diameter by 1.5 meters in length, revolving in the
_same direction_ (contrary to what takes place in ordinary rolling
mills) between two frames, B, that are open on one side to allow of
the entrance of the finishing bar. This latter is held between the
cylinders, A, which roll it so much the faster in proportion as its
diameter is smaller, and by a scraper guide, C, of the same length as
the cylinder table, and which may be regulated at will by bolts, c,
fixed to the frame, B. The bottom cylinder remains always in the same
position, while the axle, D, which carries the intermediate wheels, E,
moves about to gear in all the relative positions of the cylinders. The
displacement of the upper cylinder is effected through the clamping
screws, b, which are actuated by toothed disks that gear with two
endless screws keyed at the extremities of one shaft in common, d, which
is set in motion by hand through the winches, m m. The scraper guards, e
e, take up and throw aside all scales that might become attached to the
cylinders, which are constantly moistened by small streams of water
coming from an ordinary conduit.
[Illustration: CHUWAB'S DRESSING AND ROUNDING ROLLING MILL.
Fig. 1--Elevation and Longitudinal Section.
Fig. 2--Side View.
Fig. 3--Transvers Section.
Fig. 4--Plan View.
Figs. 5 & 6--Saws for Dressing the Extremities of the Bars.
Fig. 7--Diagram Showing the Motion of the Wheels and Guide.