Titanium alloy bar small size bar is generally produced by rolling, but in the process of heating, rolling and heat treatment, due to the uneven distribution of temperature and plastic deformation, as well as shear, transportation and stacking and other reasons, often produce different degrees of bending, then it is necessary to straighten treatment, to ensure that the bar bending can meet the requirements of use.

The commonly used straightening methods of titanium alloy bar are pressure straightening and roll straightening, and small size titanium bar is generally used roll straightening, its efficiency is higher. But for titanium and titanium alloy small size bar, often after several straightening still can not achieve the ideal effect, and even often occur in the straightening process of direct fracture problem. A simple, convenient and low input heating straightening method was proposed by analyzing the thermal straightening of titanium alloy bar and titanium alloy small size bar.

The elastic modulus of titanium and titanium alloy at room temperature is mostly lower than 120GPa. Therefore, the titanium alloy bar will have large elastic deformation under small stress conditions, and it is not easy to straighten. The bending ratio of many titanium alloys is between 0.9 and 1, and it is easy to fracture in the straightening process. Therefore, titanium alloy bars generally need to use thermal straightening, in order to ensure the straightening effect.

At present, the amount of titanium and titanium alloy is still relatively small, in the actual production process, often single batch order quantity is only hundreds of kilograms, or even dozens of kilograms, and various specifications. And general factories are often equipped with heating furnaces with large heating capacity, and the amount of a furnace can reach several tons or dozens of tons, so the heating cost is often higher when the titanium alloy bar is heated and straightened. Secondly, the straightening equipment arranged in the general factory is often far away from the heating facilities. When the titanium and titanium alloy bars are heated and then transferred to the straightening equipment, the bar temperature is often seriously lost, resulting in a significant reduction in the straightening effect. If the corresponding supporting heating and straightening facilities are specially constructed for the straightening of titanium and titanium alloy bars, the actual equipment utilization rate is low and the economy is poor.