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Media Selection depends entirely on the nature of the work piece. Lodgement or wedging in any opening, crevice, slot or hole must be avoided at all costs. The media shapes and sizes used must be too large to wedge in such openings or be small enough to freely move through them, or both.

The work to be accomplished will dictate type, shape and size or sizes of media to be used. As a general rule, the entire range of ferrous metals and high alloy steels requiring substantial burr removal, elimination of suface imperfections and formation of radii, is processed with tough abrasive media. This may be a hard all-abrasive body, such as fused aluminum oxide or silicon carbide grit. It is well known that larger sizes of such abrasive media cut faster but yield a coarser finish while smaller sizes cut more slowly but produce a finer finish. Where much stock and burr removal and radiusing is necessary but a finer finish is required at the same time, a mixture of approximately 60% of larger media and 40% of smaller media, yielding the required finish, is in order.

Sometimes finish requirements on the harder ferrous metals will not tolerate the severe cut produced by the media discussed above, and the original finish of the parts does not warrant this. As a case in point we mention flat ware produced from a lustrous grade of No. 410 stainless steel. Knives, forks and spoons must be relieved of their sharp edges and die marks, and the work must receive a high polish and reflective finish. The type of media to be employed here is a suitable "plastic" or resin bond preform containing extremely fine silicon carbide grit. The cutting cycle in flow-through process will continuously improve the finish and keep the parts clean. Table wear thus processed is then subjected to a 20 to 30 minute steel ball burnishing run for excellent results. The compound used in these operations also controls the process.

Plastic or resin bond media are increasingly used on the softer non-ferrous metals and are practically indispensable for achieving pre-plate finishes without the use of buffing. This holds true particularly for zinc die castings. Ceramic type abrasive and non-abrasive and even porcelain type media are frequently employed for specific results on non-ferrous metals.

 

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Park City Chemical offers
Specialized and Personalized services

All of the company's principles and practically all of the field sales force are cgenuine specialists. They helped to pioneer and systematize prcision barrel finishing, charging tumbling from loosley held individual ocncepts to a precise science. They developed modern equipment, techniques, and supplies. They formulated processing compounds which still enjoy a reputation as "classics" because of outstanding performance coupled with economy.

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