. Locomotive engineering : a practical journal of railway motive power and rolling stock . i^comufir* ^, .V. I. Fig. 1. Steam hammer, and is entitled at least tohonorable mention. Claw bars are made by steel dies, underthe steam hammer, that are certainly ascreditable samples of die-forging as canbe done anywhere. The forming die is shown in Fig. i, together with claw-endof bar. By the old anvil process, twelveof these bars were a big days work; atthe hammer, they are made at the rateof thirty per day. Patch bolts for boilermakcrs use arealso made by dies, the lower of which isa cas
. Locomotive engineering : a practical journal of railway motive power and rolling stock . i^comufir* ^, .V. I. Fig. 1. Steam hammer, and is entitled at least tohonorable mention. Claw bars are made by steel dies, underthe steam hammer, that are certainly ascreditable samples of die-forging as canbe done anywhere. The forming die is shown in Fig. i, together with claw-endof bar. By the old anvil process, twelveof these bars were a big days work; atthe hammer, they are made at the rateof thirty per day. Patch bolts for boilermakcrs use arealso made by dies, the lower of which isa cast-iron base, keyed to the anvil blockof the steam hammer. The top of thisblock is bored Ij4 inches deep and zViinches in diameter, to receive the upperdie; and in the bottom of this bored re-cess is still another counterbore ij^ inchesdeep, into which is pressed a steel bushhaving a hole 54 inch in diameter, andwhose top is chamfered into the hole, soas to give the bolt the countersink fit. iocuPtofiiC iiniri*^T Fig. a. when in the patch. This bush forms the■body of the bolt. The upper die is made of steel 5 incheslong, and turned to fit lower die; on itslower face it is also countersunk for thetop part of the conical head of the bolt,and recessed into a 5^-inch square to formthe bolt head. Fig. 2 shows this die andits work. The blanks for these bolts are cut thecorrect length; one end is then squaredat the helve hammer roughly, so as insureentry in the upper die; a white heat, andthe steam hanmier does the rest, turningout 6oo per day, at a cost of less than onecent each This work is exceptionally smooth andtrue, as it must be, they cut thethreads in dies, and use the bolt directfrom the hammer. No machine workwhatever is done on them, except to cutthe thread—the chuck for threading, hold-ing the bolt true axially, so that the coni-cal fit on the bolt is true with the threadedportion. This practice of not turning thebolt, will be noted as a wide divergencefro
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroa, bookyear1892
