. Marine Engineer . riven down by the hammer,thus forming the flange to the clotted lines, the tool passingright through. A renewable steel ring here also takes theforce of the blow, and m order to prevent the metal fromsplitting or thinning down at the .due- another ring is placedin the bottom of the block. Frequently a forging or part of one is formed from a flatplate, m this case the die is recessed to the required shapeand the punch embossed. In order to allow the job to releaseitself from the die a -light taper is given to the sales, or clearance. The working surfaces of both
. Marine Engineer . riven down by the hammer,thus forming the flange to the clotted lines, the tool passingright through. A renewable steel ring here also takes theforce of the blow, and m order to prevent the metal fromsplitting or thinning down at the .due- another ring is placedin the bottom of the block. Frequently a forging or part of one is formed from a flatplate, m this case the die is recessed to the required shapeand the punch embossed. In order to allow the job to releaseitself from the die a -light taper is given to the sales, or clearance. The working surfaces of both die and punch are of goodquality steel case-hardened, but the supports and handlesmay be of wrought iron, secured to the dies by riveting .hwelding. Ill -0111. cases it is advisable to keep the punchsoft, SO that it can be hammered up to shape again whenworn, and with heavy work the effect of the concussion isles- s.\ere on the -oft than on the hardened material and apoorer qualit) steel 1- therefore often fiijr. JZifiJIL. In marine work dies and forging machines have not hitherto been -o large]) adopted a- m railway, motoi Car,and -mall machine establishments, partly due to the heavieiand rougher 1 la— of article and partly to the difficulty instandardizing. Othei methods also have come into mm-petition with die work and the introduction ol high-speedmat Inn. tool and -teil ha- resulted 111 part- ot mor. ...les- regular and round form being nit entirely from the baiin turrit lathe- where th. number required 1- sufficient!)..ml th. difference in diameter- not too 11. however, some ease- where die- ma) be used with advantage leu instance the Munt/ metal spindles lotwing valves are often required oi other than standard lengthsand not cut Irom the bar, miles- several anneeded alike ; collar . fitting into the valve head doe- not require ma. hining 1! the die be employed, and the forgingcan be made much nearei the finished size,
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Keywords: ., bookcentury1900, bookdecade1900, bookpublisherlondon, bookyear190
