What is the limit bending of CNC copper bar machining?

The minimum value of bending radius = 2 times the model diameter, and the maximum value = 4 times 2/3 the model diameter. In the process of copper bar bending, the requirements of bending radius are: minimum bending radius = 2 times the model diameter, and maximum bending radius = 4 times the model diameter. If the bending radius can't meet these requirements, it will affect the processing quality, the copper bar material will be deformed, and even the copper bar will be destroyed, which will affect our production efficiency.