Springback compensation method in heating bending technology

Abstract

The invention discloses a springback compensation method in a heating bending technology. The method includes the following steps that two different forming temperatures are selected, and the bendingangles after springback at the two temperatures are measured respectively; the angle slopes of the bending angles after springback of a material during heating bending forming are calculated by the aid of the selected forming temperatures and the corresponding bending angles after springback; the first-time formal bending forming temperature is determined according to the angle slopes of the bending angles, and the bending angles after springback at the corresponding temperatures are measured; and the current-time forming temperature is corrected by the aid of the deviation of the last-time bending angle after springback from the target bending angle until the number of bending forming times reach the preset number of formed pieces. According to the method, under the condition that mold parameters in a mold bending technology are not changed, the bending angle after springback in the mold bending technology can be compensated through adjustment of the temperature applied to a plate, sothat the consistency of angles of bent pieces after forming is improved, the time for mold repairing and mold testing is saved, and the flexibility for forming plates made of different materials by the aid of one set of molds is improved.

Description

technical field [0001] The invention relates to the field of material processing, in particular to a springback compensation method in a heating bending process. Background technique [0002] In the sheet bending process, the outer fiber of the sheet is subjected to tensile strain and the inner fiber is subjected to compressive strain. When the external force is unloaded, the inner fiber releases the compressive stress and elongates, and the outer layer fiber releases the tensile stress and shrinks, so that the sheet bends After unloading, the bending angle decreases compared with that before unloading, and the decrease of bending angle is the amount of bending springback. The amount of springback of the sheet is affected by many factors, such as material properties, geometry of bending parts, etc. In response to the demand for energy saving and emission reduction of automobiles, the demand for high-strength sheets is increasing, but with the increase of yield and strength ...

AI Technical Summary

Problems solved by technology

In response to the demand for energy saving and emission reduction of automobiles, the demand for high-strength sheets is increasing, but with the increase of yield and strength of high-strength sheets, the amount of bending springback is also greater. For the mold bending process, if the sheet performance Consistent, you can adjust the shape of the mold to make the bent part as close as possible to the target bent part after springback, but the rolled sheet is often different batches, different rolls and different directions will bring the sheet metal Due to the difference in mechanical properties, it is difficult to guarantee the consistency of the result after forming for such a sheet

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