Sheet metal machinery and equipment due to poor working conditions, often loaded or overloaded with work, a number of parts or components deformation is relatively common. Some parts (such as the crankshaft, screw, rod, etc.) because of its shape, simple, intuitive deformation of the harm resulting deformation of the inspection and correction is also relatively simple, so easy to repair neglected. However, as some basic components (such as machine tools gearbox, slide board boxes, lathe rails, etc.) and transmission parts, with its complex shape, and mutual location accuracy, sports require a higher precision, but the measurement of inspection and correction of deformation are the more difficult. Therefore, in repair, the deformation of such parts to be taken seriously enough.
    Machine Tool Spindle gearbox, the main bearing bore distortion makes the concentricity and roundness exceed its tolerance requirements, which may cause the drive shaft in the bearing deflection and speed up the shaft wear; gearbox and slip sheet box of deformation and failure normal gears meshing, resulting in partial tooth wear, resulting in larger axial pitch in to help speed up the gear wear; light bars, screw driving accuracy caused by the deformation of parts machining error is too large such phenomena occur.