| 摘要 |
PURPOSE:To control stretching rate to an optimum value by detecting the stress- strain characteristic of a material to be stretched in the stretching process of said material. CONSTITUTION:The output signals X1, X2 of position detectors 1, 2 are added in an adding part 6 and thereafter a tension amt. epsilon' is determined in a divider part 7. Pressure sensors 9, 10 are provided to a hydraulic circuit for driving cylinders 1, 2 and the output signals P1, P2 therefrom are added in an adder part 11. The stress sigma generated in a material 8 to be stretched is determined in an integrating part 12. An arithmetic processing part 12 stores the coefft. E of longitudinal elasticity of the material 8, determines the initial deflection rate epsilonc from epsilon' and sigma within the elastic limit, determines the spring back amt. from sigma, epsilon' exceeding the elastic limit and determines finally the stretching rate epsilon. The stretching rate is determined at the point of said time and therefore the control of the stretching rate is made easy. |
