"Parts without distortion are not hardened" - after many efforts in avoiding undesired distortion on hardening this statement of experienced heat treaters may not be completely valid today. In many cases, however, workpieces require straightening after hardening. The two main methods are "straightening by bending" and "straightening by applying pressure/peening" are presented. Many hardening shops try to minimize their investments in modern straightening equipment. They underestimate the chance to achieve a quick return on investment through the use of manual or automatic straightening machines. Improvements in cycle time and accuracy, a constant quality, the minimization of grinding overmeasures and the possibility to use unskilled workers are important arguments for the actual straightening machine generation.
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