Document MJaDpM6wxVQBZDbXXx01j022x

33--Hot Working of Metals mg hammer will help ensure proper condi tion of all bolts, screws, keys, valves, and other parts which may be loosened by vibra tion Simdarly, thorough periodic inspection and adjustment should be made of all parts of the treadle or pedal, clutch, and other op erating mechanisms Worn or loose treadle linkage, motion arm, crank arm, and treadle can cause the hammer to go out of control These parts especially should be kept in good repair The clutch is a vital part of the forging press and must be kept in good condition if the press is to operate satisfactorily A broken spring or part which shows wear should be replaced at once Lead casts Lead casts are taken m practically every conceivable manner in the forging industry Casts should be taken only in an isolated area, if possible, where there is no likelihood of interference from or injury to other workers The die impressions should be dry since hot metal that contacts water produces flying particles of molten metal Lead pots should be ventilated to the out side of the building Forging Upsetters The upsetter is a horizontal forging ma chine which forges hot bar stock, usually round, into a great many forms by a squeez ing action instead of impact blows, as in the case of forging hammers Although numerous hazards are involved m the operation of an upsetter, the most senous problems aie en countered in changing the dies The entire machine should be completely enclosed, except for the feed area Heavy wire mesh or expanded or sheet metal rein forced with stiuctural steel should be used Doors may be cut into the enclosure for serv icing flywheel, brake, and other moving parts A guard should be installed ovei the operating pedal Safe operating conditions call for the area around the machine to be clean and clear of obstructions and litter It is especially unpoitant that the top of the machine be cleai of any objects, such as loose bolts, bars, nuts, or shims, which might fall into it or from it 940 SIMM HAMMS MAMimANCS CHECK ITEM CHECKED CY1. HEAD BOMS MOTION VALVE STEM MOTION VALVE CKAMK MOTION VALVE CONNECT WCFCt Ml t CtAMX TKtOTTlf C1ANK TNKOTTU UMXAGf KAM 4 SOW BLOCK Ml KITS A SHIMS SOW BLOCK KEYS A SHIMS 9US0E BOLTS GWDI WEAB G4RDC ADJUSTING BOLTS GUIDE WD6I POSITION MOUSMO BOLTS A SHUNGS IKCADU TIE PLAT! UNO PISTON BOO GLAND PLATE GLAND BOLTS TBCADLE PLATPOKM STEAM CUSHION UM SCALE HOSE SAFETY UNO SAFETY PBOP STEAM LMB STEAM SHUTOFF VALVES BEACH BOO COLUMNS FLAT ON BASE COLUMN WEDGE A BOLTS SPOOL BOLT B PM SAFETY CABLES CKACKS-M BASE 1MABKS CONDITION TYPE OP CEPAll CST KKS TO BCPAB Fic 33-25 --Maintenance checklist for steam hammers The operator should shut off the power, lock the main power switch, and immobilize the flywheel before attempting to adjust dies, heading tools, stock gages, or backstops Design of dies Dies and heading tools used in an upsetter or horizontal forging machine are not usually subjected to such severe abuse as are hammer dies A good grade of chrome, nickel, or molybdenum steel of the correct hardness is lecommended for giipper dies It is common practice m die shops when resinking upset dies to use inserts lather than to cut down the dies The inserts most com monly used are made of a high chrome, nickel, 01 molybdenum steel with silicon added Tool steels with a vanadium and tungsten analysis are also used for inserts and headers, but they must be selected to satisfy operating conditions because of their limited use where