The tools used for steam-hammer work are generally very simple. Swages for finishing work up to 3 or 4 inches in diameter are commonly made in the shape shown in Fig. 161. The handle is made in the shape of a spring and may be either made in one piece with the blocks and drawn out as shown at C, or may be inserted as shown at B. This sort of tool is known as a spring tool. Another sort of swage sometimes used is illustrated in Fig. 162, the top swage at A, the bottom swage at B. This sort of swage is used on a die block which has a square hole cut in its face similar to the hardie hole in an anvil. The short horn X, of the swage, fits into this hole, the other two projections coming over the side of the anvil block.
Fig. 161. Swage for Steam-Hammer Work.
The faces of the anvil and hammer dies are flat and parallel, and it is, of course, impossible to finish tapering work smooth between the bare dies. This work may be done by using a tool similar to Fig. 163. Its method of use is shown in Fig. 164, the roughing being done with the round side down and the finishing with the flat side. Fullers used for ordinary hand forgings are seldom employed in steam-hammer work. Round bars are used in their place in the manner illustrated in Fig. 165. If a nick is wanted on one side only, simply one round bar is used. Care must always be taken to be sure that the work is in the proper position before striking a heavy blow with the hammer. To do this the hammer should be brought down lightly on the work thus bringing the piece to a flat bearing for the first blow.
Fig. 162. Swage Used on Die Block.
Fig. 163. Tapering and Fullering Tool.
Fig. 164. Method of Using Tapering and Fullering Tool.
It frequently happens that work is knocked lopsided under the hammer, being worked up into some such shape as shown at A, Fig. 166. To correct this and bring the work up square, the bar should be put under the hammer and there knocked into shape B, then rolled in the direction indicated by the arrow until shaped as at C, when it may be worked down square and finished like D.