What is hot straightening?

Hot straightening is an operation to correct the deformation by applying external force or changing the internal stress state of steel parts in various ways with the help of the characteristics of good plasticity of steel parts at a certain temperature. Due to the heating state with a certain temperature, it is easy to correct, so the thermal straightening method is widely used.

Why does the workpiece need to be straightened?

• 1) After heat treatment, the workpiece is bent or warped due to thermal stress and structural stress, which is beyond the scope and must be straightened. The deformation of the straightened workpiece shall meet the process requirements.
• 2) Straightening methods include: cold pressing method, hot pressing method, hot spot method, pressure tempering method, tempering waste heat method and counterattack method. It can be selected according to different conditions and requirements such as workpiece shape, material and hardness.
• 3) The workpiece with large size and large deformation resistance shall be pressurized by hydraulic press; Small workpieces can be pressurized by manual screw press; Small workpieces with low hardness and good toughness can be straightened by hand hammer. Batch workpieces shall be equipped with special straightening fixture to improve work efficiency.