Planetary Mill with Friction Wheels Transmission Aided by an Additional Degree of Freedom

Italo Leite De Camargo,Rogério Erbereli,Carlos Alberto Fortulan,João Fiore Parreira Lovo

doi:10.3390/machines7020033

Italo Leite De Camargo, Rogério Erbereli + Show 2 more

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https://doi.org/10.3390/machines7020033

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Abstract

Processing in planetary ball mills is well suited to a large number of applications because they are easy to operate and versatile, grinding faster than other mills. Research related to planetary mills are mainly about the process evaluation, and there are few studies on the mechanical design of such equipment. This paper describes the decision process in the design of an innovative planetary mill in which design for manufacture and assembly (DFMA) principles were used to provide compact equipment made of simple and standardized parts. We developed a friction wheel mechanism with an additional degree of freedom that improves transmission and facilitates assembly, reducing the need for adjustment. It can be applied to different equipment that relies on planetary motion or rotating devices. A prototype was built, and its grinding performance surpasses that of other types of traditional mill. The mean particle size of alumina powder was reduced from 4.2 µm to 0.9 µm in 60 minutes.

Highlights

Laboratories and modern industry require fast and effective grinding in small volumes
Computer simulations based on the discrete element method (DEM) are widely used to optimize the grinding parameters [1,2,3,4] and experimental analysis of the commercial equipment is used to validate the models [5,6], or to test performance [7,8,9]
The central friction wheel is attached to the electric motor flange and the disk is attached directly to the electric motor shaft, demanding a careful choice of the electric motor that will attached directly to the electric motor shaft, demanding a careful choice of the electric motor that will undergo under mechanical stress

Summary

Introduction

Laboratories and modern industry require fast and effective grinding in small volumes. Planetary ball mills are well-suited to these applications because they are easy to operate and versatile, capable of performing dry and wet grinding. Computer simulations based on the discrete element method (DEM) are widely used to optimize the grinding parameters [1,2,3,4] and experimental analysis of the commercial equipment is used to validate the models [5,6], or to test performance [7,8,9]. There are few studies on the mechanical design of these mills

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