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MACHINE FORGINGFor specific jobs like mass manufacture of bolts and nuts from bar stock, special forging machines havebeen developed. These machines work alongside a furnace in which one end of bar is heated for somelength. The heated end of bar is than fed into the machine. With the help of dies and a heading tool, thehexagonal head of the bolt is forged by “upsetting”. These machines are in reality horizontal mechani-cal presses which can be operated by a foot pedal. The die consists of two halves and a heading tool.The sequence of operations can be understood from Fig. 2.8.
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