TA1 纯钛薄板聚氨酯软模微成形摩擦尺寸效应与建模

To investigate the frictional law and size effect mechanism of TA1 pure titanium thin sheet in polyurethane flexible mold microforming, a custom-built sliding friction testing platform was employed to systematically analyze the influences of normal pressure, sliding speed, and specimen width on the friction factor. A multi-factor coupled friction factor prediction model was developed based on the " open-closed" lubrication theory. Experimental results demonstrate that under castor oil lubrication, the friction factor decreases with increasing normal pressure and sliding speed. Model fitting results indicate that the maximum error between the theoretical values of the coupled model incorporating size effect, normal pressure, and sliding speed and the experimental data is 3. 8%, which validates the reliability of the proposed model. This study uncovers the underlying mechanism of friction size effect under the combined action of pressure and velocity in polyurethane flexible mold microforming, thereby providing a theoretical foundation for process parameter optimization and frictional modeling.