This is especially critical in work-hardening materials where a canned cycle that generates the last few passes at infeed depths of less than 0.002" will
work-harden the thread's surface beyond the point of viable machinability.
The oven is used to anneal solid components which
work-harden during machining and for solution treating and precipitation of sheet metal assemblies before and after forming.
"With between 2% and 5% expansion of the material," he says, "you actually
work-harden the material, so you gain some additional strength."
For example, stainless steels with their added nickel content
work-harden as they are cut.
The oven is used to anneal solid components which
work-harden during machining and far solution treating and precipitation of sheet metal assemblies before and after forming.
All case-forming techniques
work-harden brass, something to consider after we've spent considerable time creating a batch of .223 Ackley Improved or 6.5-06 cases.
As it is fired and sized a brass case tends to
work-harden so it should only be used once or twice for base measurements.
This can result in chips not being properly flushed from parts and workholding parts, premature tool wear, inaccurate tool compensations, and higher temperatures that can
work-harden areas of the part.
"Because each of these operations will typically
work-harden the piece and add strength," Finat remarks, "a thorough knowledge of the metallurgy of the raw material and how it will be affected is required, so that the required finished product specifications are met."
LMT hammer forges its barrels, which
work-hardens the bore.