During the forging process, the allowance for the forged piece or round bar is determined
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A: How is the remaining amount of round steel during the forging process determined? Is GB 908 the standard? b: How is the allowance for forgings determined? For example, in the case of stepped fittings, how should the dimensional tolerances be determined? Are the standards GBT21469/21470/21471? C: If so, in GBT21471, for step shafts under item 4.1 – shafts with circular cross-sections – the ratio of the total length L of the free-forged shaft to the maximum diameter D of the step should be greater than 2.5. Is it still applicable when it is less than 2.5? For example, the dimensions of a large and small head might be: φ105*55+φ68*65
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