The traditional whole forging straighting roll was replaced by the high strength,wearable and anti-corrosion welding-up composite straighting roll,and the ident defect of plate surface was eliminated.

In view of meeting the requirement of railway development for straightness rail,the technology of compound straightening is applied in Panzhihua Iron and Steel CoThe research and application results show that the eligibility percents of the straightness of center and the end of rail are increased,the rail height difference is more small,and the residual stress is also reduced

A new processing method of envelope curve surface of straightener roll;

The spacial curve is continuous which is formed by straightener roll and tube(bar)tight contact.

The curve equation and surface equation about the cross-roller are educed and founded by the method of the spatial and analytical vectors, its section equation is an approximate double-curve equation.

The curve equation and surface equation about the cross-roller are founded by the method of the spatial and analytical vectors; And the equations are proved and analyzed on mat lab.