Other Types of Mass Finishing Equipment

The mass finishing processes discussed so far are the well-established mechanical finishing techniques throughout industry. Equipment comes in a variety of shapes and sizes to meet special requirements. Equipment has been developed to suit changing requirements and is frequently built to meet special purposes. Other mass finishing machines offered with slightly different actions from those that have been discussed include the following:

Vibratory rotary barrel machines are conventional tumbling barrels that are vibrated as they rotate. They were originally developed to avoid some of the problems of parts migrating out of the media in tub vibratory equipment. These machines do not appear to have any substantial merit for modern generalpurpose deburring and finishing.

• Reciprocal finishing: As in spindle finishing systems, parts are attached to a holding device and placed into a tub of media, water, and compound. The component is moved through the mass of media in a reciprocating motion. This process permits the handling of parts too large for spindle finishing machines. Action is concentrated on just one side of the component for specialized finishing. Process cycles are generally much longer than with spin finishing machines, and equipment is special and of limited purpose.

• Chemically accelerated centrifugal barrel finishing: A combination of chemical polishing with centrifugal barrel finishing has found many worthwhile applications, particularly with high-precision, complex-shaped ferrous components. The process is substantially more costly than normal centrifugal barrel finishing and is only suited to very special purposes.

• Electrochemically accelerated mass finishing equipment: For special purposes, a combination of electropolish and vibratory or tumbling barrel action achieves very fast stock removal. The process is expensive and inconvenient and is not commercially used in the United States.

• Orboresonant cleaning and finishing: Parts clamped on fixtures are oscillated at very high frequency in a bed of fluidized media, with some capability for removing internal burrs and cleaning internal surfaces.

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