Introduction

MASS FINISHING normally involves loading components to be finished into a container together with some abrasive media, water, and compound. Action is applied to the container to cause the media to rub against the surfaces, edges, and corners of the components, or for components to rub against each other, or both. This action may deburr, generate edge and corner radii, clean the parts by removing rust and scale, and modify the surface stress. The basic mass finishing processes include:

• Barrel finishing

• Vibratory finishing

• Centrifugal disc finishing

• Centrifugal barrel finishing

• Spindle finishing

• Drag finishing

Mass finishing is a simple and low-cost means of deburring and surface conditioning components. Consistent results from part to part and batch to batch are generally ensured. All metals and many nonmetals in a variety of sizes and shapes can be handled. Processes range from heavy radiusing and grinding operations to very fine finishing.

A basic advantage of mass finishing is that the action is effective on all the surface edges and corners of the part. Normally, preferential treatment to one area is impossible. Action is greater on corners than other similarly exposed surfaces. Action in holes and recesses is less than on exposed areas.

The mass finishing processes are used to:

• Clean, descale, and degrease

• Radius edges and corners

• Change surface condition

• Remove surface roughness

• Inhibit corrosion

• Stress relieve

• Impart compressive stress

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