Study on change law of the inner texture of the square truncated cone in NC incremental forming

The square truncated cone is processed by NC incremental forming in order to analyze the change law of metal texture. The experiment results show that a uniform thickness of the deformed region is maintained and in good accordance with that obtained by the sine law. The metal deformation law is searched by metallurgical analysis. The crystalline grain is stretched severely on the vertical section of the square truncated cone. The crystalline grain size is constant on the horizontal section of the square truncated cone. The metal shear deformation occurs in the square truncated cone. It is drawn that the NC incremental forming is a shear forming. The experiment is made to verify it.