Quantification of Recoating Forces in Binder Jetting

Binder jetting in sand has recently become increasingly important for production in additive manufacturing. The performance of this process depends very much on the recoating speed. It is linked to the geometric accuracy of the components. If the recoating speed is too high, individual layers are displaced. The displacement of the component layers is not fully understood. Therefore, the recoating forces must be measured. In this work, the parameters "layer thickness", "recoating speed", "roller speed" and the influence of "printed layers" are measured to validate the suitability of the developed custom measurement device. The values are between 7 mN/cm and 40 mN/cm recoater length. Increasing layer thickness and roller speeds reduce the recoating forces. Increasing recoating speeds increase the recoating forces. Printed areas lead to measurable deviations in the force curves. To reduce the displacement of components, a reduction in the amount of sand used by the recoater is recommended.