The Profile Switch To The Desktop Tension Mechanics Analysis And Springback Analysis

Springback is a common phenomenon in bending process, which is caused by the redistribution of the internal stresses during unloading. In sheet metal forming, the springback can affect the precision of the formed part directly, and some approaches must be used to minimize those undesirable effects. It has been proved in fact that the approach of stretch bending can decrease the springback effectively, and this can improve the forming precision, so the process of stretch bending can be widely used in the forming of the workpieces in the field of car and aircraft.In this paper, the analytical method is used to analyze the forming process of the extruded profiles in the rotary stretch bending. The process of rotary stretch bending without lateral compression and with lateral compression is analyzed separately, and the models of the stress distributing in the section and the springback are also presented separately to discuss the relations between pre-stretch force, lateral compression and the amount of springback.Numerous experiments had been done on the equipment of ZTLW-8. Compared with the experimental results, the analytical values are fairly close to the experimental ones on the condition of without lateral compression, and somewhat smaller than those on the condition of with lateral compression. Meanwhile, our study also shows that the springback radius is primarily controlled by the pre-stretch force and lateral compression. That is to say, the amount of the springback decreases with the increase of the pre-stretch force and lateral compression, and the decreasing trend is close to a linear relation, and when the lateral compression is large enough, the negative springback appears.For the first time, the process of the rotary stretch bending with lateral compression is analyzed by analytical method, and a new explanation is put forward to explain the negative springback in the forming process.