We investigated the effect of the friction coefﬁcients of a barrel on the grinding performance of multi-layer ceramic capacitors (MLCCs) in a planetary ball mill. We formulated the motion equation of the MLCCs, including gravitational force, interactive force due to collisions and the drag force in a planetary ball mill, using the three-dimensional discrete element method. The contact model in a collision between two MLCCs is represented by the Voigt model. The linear velocity, impact and shear energy according to the friction coefﬁcients of a barrel were calculated. The trajectory of a single MLCC and the linear velocity distributions of many MLCCs were analyzed. It was found that an increase of the friction coefﬁcient of a barrel not only improves the shear energy, but also reduces the impact. Finally, grinding exper- iments using four barrels with different friction coefﬁcients were conducted to verify the simulated result. The measured wear height accurately matches the height expected from the simulated shear energy. 1 Introduction impacts but also to increase the mill grinding efﬁciency. This optimization improves both the quality and efﬁciency A multi-layer ceramic capacitor (MLCC) is a general-type of the MLCC manufacturing process. capacitor that temporarily stores electric charge and
Microsystem Technologies – Springer Journals
Published: May 31, 2018
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