Metal Finishing Guide Book


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Table II. Budgetary Costs for Mechanical Plating Systems Working Volume Cost Integrated Single-Barrel System with Centrifugal Dryer 0.17 m3 (6 ft3) $117,000 0.28 m3 (10 ft3) $133,000 Dual-Plating Machine System with Automatic Chromating/Passivation and Dryer 0.17 m3 (6 ft3) $231,000 0.28 m3 (10 ft3) $266,000 0.56 m3 (20 ft3) $317,000 0.85 m3 (30 ft3) $367,000 1.13 m3 (40 ft3) $436,000 EQUIPMENT Mechanical plating equipment is a specially designed plating and material handling system. The plating takes place in stainless steel variable-speed tumbling barrels (Fig. 1). Because the entire process operates at an acidic pH of 1 to 2, the barrels must be lined with an inert, abrasion-resistant protective coating, such as urethane, neoprene, or polypropylene, to a thickness of 19 to 25 mm (0.75-1 in.). Typical plating barrels have capacities of 0.04 to 1.13 m3 (1.5-40 ft3), where capacity is defined as the total available working volume, typically 30 to 35% of the total volume. For example, a 0.57 m3 (20 ft3) plating barrel will hold approximately 910 kg (2,000 lb) of 25-mm- (1-in.)-long threaded fasteners and 1,000 kg (2,200 lb) of glass bead mix. See barrel loading capacity chart (Fig. 2). In Fig. 3, parts to be mechanically plated are brought to the barrel loading hoist (1). Glass media are transferred from an overhead media reservoir tank (2) into the plating barrel (3). The operator's platform and control panels serve Fig. 4. One of the computer automation display screens showing cycle progress. 397

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