求翻译：轧件在加热、轧制、热处理及各种精整等工序加工过程中，由于塑性变形不均、加热和冷却不均、剪切以及运输和堆放等原因，必然产生不同程度的弯曲、瓢曲、浪形、镰弯和歪扭的塑性变形，或内部产生残余应力，这在成为合格的产品之前，都必须采用矫正机进行矫正加工，矫正轧件形状和消除内应力。所以，矫正机是轧制车间和精整线上必不可少的重要设备，而且也广泛用于以轧材做坯料的各种车间。是什么意思？

Rolling in the process of heating, rolling, heat treatment and finishing processes, due to the uneven plastic deformation, heating and cooling uneven shear as well as transport and stacking, and other reasons, will inevitably produce different degrees of bending, buckling , the plastic deformation o