Abstract: The production of short glass fiber had low efficiency and high cost because of the lack of study on special tool. To change this situation， the special tool was researched. Firstly， a bendcutting model of the glass fiber was established. Then， the cutting depth and angle were discussed theoretically. The edge angle of the tool was lucubrated to get the edge selection range and the range was further verified by the years of production test. It showed that the further optimization of the edge angle was relevant with the tool material and the ideal properties of the tool material were analyzed. SKS was selected for a shortcutting test to compare with the T12A tool. It is found that the service life of CrWMn tool is 5 times longer than general carbon steel tool. The productivity of the short glass fiber is greatly improved.

Key words: glass fiber, short cutting, bendcutting, cutting angle, edge angle