[Introduction] Interference fit problem occurred during installation of a cylinder part, mainly due to the ununiform thickness of the hard anodic oxide film inside the cavity and the too thick film at the top of inner cavity. [Method] A tooling for adding an auxiliary electrode inside the cavity of cylinder part was designed and fabricated. The auxiliary electrode was improved based on the anodization testing and finite element analysis. [Result] The hard anodic oxide film inside the cavity of the cylinder part was uniform with a required thickness ranging from 10 to 20 μm after installation of the electrode-adding tooling. [Conclusion] The use of a suitable electrode-adding tooling during hard anodization is conducive to control the thickness of anodic oxide film inside the cavity of cylinder part, improving the uniformity of film thickness.
cylinder partinner cavityhard anodizingauxiliary electrodefilm thickness uniformitypower line distributionfinite element analysis
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