Pre stretched 7075 alloy aluminum plate is stretched on the basis of ordinary 7075-T6 aluminum plate through a tensile machine to eliminate internal stress of the aluminum plate, ensure that it does not deform during processing, and have better flatness. What are the factors that affect the flatness of 7075 alloy aluminum plate?
1. Due to the irregularity of the size and uneven stress distribution of the 7075 aluminum plate before stretching, effective control of a stable speed during the stretching process allows for sufficient and uniform deformation of each deformation unit, which is one of the important conditions for achieving uniform stretching.
2. The influence of the stiffness and pre deformation compensation of the stretching machine frame: Due to the equal placement of two tension cylinders on both sides of the 7075 alloy aluminum plate stretching machine, for plates with larger cross-sectional areas, the deformation generated by the frame during the stretching process will be greater. Therefore, the stretching machine frame should maintain a relatively high stiffness, and pre deformation compensation of the frame should be considered in design and manufacturing to overcome and compensate for the deformation generated by the frame during the stretching process.
3. The clamping quality of the jaws plays a decisive role in the stretching quality. The uniform clamping of the jaws enables each unit of the longitudinal plate to be stretched to an equal length, achieving uniform stretching and also straightening the 7075 aluminum plate.
4. Practice has shown that the horizontal flattening effect of 7075 aluminum plate, which is relatively shorter in length and wider in width, is much better. In production, a process plan with a larger aspect ratio should be selected.
5. For 7075 alloy aluminum plates with significant deformation after quenching, a roller straightening machine should be used for preliminary leveling, and then the next step of fine leveling should be carried out on a stretching machine. Due to the main function of the stretching machine being to eliminate residual stress in the sheet metal, which is mainly a plastic deformation process with small longitudinal deformation, it has a good straightening effect on the longitudinal direction, and its ability to improve the transverse flatness is very limited.
The above is an introduction to the factors that affect the flatness of 7075 alloy aluminum plate. If you need to purchase 7075 alloy aluminum plate, you can contact us.
