Shin′gler.
An eccentric wheel or roller revolving within a concave and pressing the dross out of the
loop or
ball from the puddling-furnace.
In the figure, the
loop a is pressed between the three cam-rolls
b c d, the first of which has a collar
b′
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Shingle-planing machine. |
at each end, between which the other two work;
c is adjustable by a screw
c′, and
d is backed by a screw
d′, which yields when the thickness of the bar is excessive, and is brought back to place by a weighted lever on the axis of the wheel
e, which engages with the pinion
f that turns the screw.
The squeezed bar drops on to the bed-plate
g of the machine, and is then pressed longitudinally by a bell-crank lever device.
See squeezer; trip-ham-Mer; steam-hammer.
In
Siemens' process for shingling and compressing puddled balls, the ball is placed on a turn-table and subjected to the pressure of three or more hydraulic rams advanced simultaneously toward it horizontally in radial directions.
The pressure being relieved and the rams withdrawn by counterweights and springs, the turn-table is partly turned so as to present fresh portions of the ball to the rams, which are again advanced.
When the ball has thus been squeezed all round, a ram or screw head is brought to bear on it vertically, and the rams are advanced with a higher degree of pressure, after which the consolidated metallic mass is with drawn to be rolled, hammered, or converted into steel.
To economize power, two sources of hydraulic pressure are employed, the one giving a low pressure for the first part of the operation, and the other a much higher pressure for completing it. Instead of using a number of separate hydraulic cylinders, the several pressure-heads may be worked from one hydraulic cylinder, or by steam or other power.
