(1) The clamping quality of the jaws plays a decisive role in the tensile quality of the 5A02 aluminum plate. The uniform clamping of the jaws makes each unit of the longitudinal direction of the plate stretched to the same length, so as to achieve uniform stretching and play a role in correcting The straightening effect of the plate.

(2) Influence of stiffness and pre-deformation compensation of the frame of the stretching machine: Since the two tension cylinders of the sheet stretching machine are equally placed on both sides, for the sheet with a larger cross-section, the frame will be generated during the stretching process. The deformation is also greater. Therefore, the frame of the stretching machine should maintain greater rigidity, and the pre-deformation compensation of the frame should be considered in the design and manufacture to overcome and compensate for the deformation of the frame during the stretching process.

 (3) The irregularity of the size of the 5A02 aluminum plate and the unevenness of the stress distribution before stretching. Effectively controlling the stable speed during the stretching process, so that each deformation unit can be fully and uniformly deformed, which is an important factor to meet uniform stretching.

(4) Practice has proved that one of the conditions for the lateral flattening effect of the plate with a relatively small length and a relatively large width is much better. In production, a process plan with a larger width and length ratio should be selected.

(5) For the plate with large deformation after quenching, it should be initially leveled with a roller leveling machine, and then the final fine leveling should be performed on the stretching machine.

(6) Since the main function of the stretching machine is to eliminate the residual stress of the plate, the plastic deformation process with small longitudinal deformation is the main function, so it has a better straightening effect in the longitudinal direction, and the ability to improve the horizontal straightness is very limited. .

The above is the introduction of the factors affecting the flatness of 5A02 aluminum plate.