The research and practice about the large parts's large amount of interference liquid nitrogen cold loading process technology

摘要

The MP800's main frame be completed of spindle assembly during the manufacturing process, Processing to the spindle for a new benchmark for the rest of the dimension chain. The frame size is very large, heavier, material for iron, brittleness, uneven heating not easy to bear the impact and tensile force; flange hole on the frame, the size of parts relatively small, small weight, materials for low alloy steel; hole and shaft with high precision, large amount of interference, Relying on the cooperation between the surface to overcome the friction torque and axial force during working, belong to a large part of large interference not detachable fixed connection; the spindle assembly using liquid nitrogen cold fitting technology.