Abstract
Aiming at the problems of the CNC incremental forming based on the constant feed speed, an algorithm for the unequal feed speed determining that is adaptive to the surface features and a method for the CNC incremental forming based on the unequal feed speed were proposed. The volume change rate threshold was calculated based on the volume average change rate of the sheet metal involved in the forming and the volume change rate between two adjacent path points. And then, the feed speed between the adjacent path points was determined by the threshold value. Thus, for the sheet metal parts with the complex shape, the different feed speeds were assigned to the regions with different forming angles according to the shape features of the sheet metal parts so that the formability and the forming quality were improved under the same forming efficiency. At the same time, the finite element analysis method for the CNC incremental forming based on the unequal feed speed was given out by calculating the time node points of the forming tool head at each path point, according to the distance between the two adjacent path points and the determined feed speed. The numerical simulation analysis and the forming experimental results show that the CNC incremental forming based on the unequal feed speed is better than the CNC incremental forming based on the constant feed speed, which can improve the profile accuracy of the sheet metal parts, the surface roughness, and formability that under the same forming efficiency.
Published Version
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