The Difficulties of Making Large Roto Molds
Point 1. Surface treatment
All the inside of the mold is mirror polished, which requires that the porosity should be strictly controlled below 1%, and it should be based on high-quality casting blanks.
Point 2. work blank making
In the process of sanding and CNC machining of large-sized molds, even slight deformations will cause the modules to be scrapped and need to be remanufactured.
Point 3. Welding
Each module is welded and connected, and the requirements for welding workers are very high. Mold deformation is very easy to control with small size molds, but large molds can magnify some problems.