ПЕРЕВЕДИТЕ.Machinability is a very complex mechanical property, and it has been

ПЕРЕВЕДИТЕ.Machinability is a very complex mechanical property, and it has been impossible to measure it by any of the simpler mechanical tests. For example, ordinary steels having a Brinell number of not over 200 are readily machinable,while manganese steel of a Brinell well under 200 is not machinable. For cutting gear teeth in forged steel, the steel is heat-treated to a Brinell hardness of about160 to 170. If the Brinell hardness is 150 or less, the material will be too tough and plastic to machine well. Copper and aluminium, because of their softness and toughness, are not easily machined.s ago.