Metal Finishing Guide Book


Issue link:

Contents of this Issue


Page 745 of 843

tion (Figure 3). Installation of PC/HMI-driven chemistry management controls will improve quality and reduce operator addition errors. 4) Programmable load-by-load rinse water replenishment allows optimization of water consumption on an individual part number basis. This feature enables experimentation with the minimum rinse water volume necessary to assure quality processing. The goal is to minimize total rinse water usage, thus reducing wastewater treatment volume and associated chemistry consumption. Precision control is available only by an integrated PC/HMI. The control screen allows separate replenishment volumes for full or empty loads, further minimizing rinse water usage (Figure 4). Installation of PC/HMI recipe-driven rinse water controls will immediately reduce rinse water consumption compared to constant flow rinse water replenishment systems. 5) Variable plate time programming for multi-process machines allows multiple immersion times and cycle options while maintaining repeatable process parameters. Production rate remains fixed to take best advantage of material handling equipment. The Jessup variable plating time process accepts work with differing plating tank immersion times while retaining predictable and repeatable process times in other areas of the machine (Figure 5). Immersion times are a multiple of the machine cycle time. This approach guarantees repeatable plating at a constant production rate. Load/unload operations and external logistics remain unaffected. Also available is process cycle re-engineering to speed changeover between processes. This becomes increasingly important as the industry shifts to smaller lots, which require more frequent break-in sequences. Retrofit hoists, controls, and variable plate time programming eliminate guesswork and operator sensitivity associated with older simple-cycle multi-process finishing systems. 6) NADCAP & ISO quality system capable automation is assured with PC/HMI over-the-top and appropriate sensor technology monitors, controls, and records critical quality control information. Data such as tank temperatures, immersion times, rectification, pH, conductivity, barrel rotation or oscillation speed and/or duration, chemistry additions, and rinse water usage is collected and stored on a load-byload basis. Further, data is exported to the customer data highway for upload into quality management database. This system creates truly paperless quality control. The Jessup PC/HMI system captures more data than end-user customers require. The finisher's quality control department will have access to current and historical trend data never before available. 7) Jessup cylindrical barrels can offer 17% increased capacity and 12% better work-to-anode relationship compared to hex barrels for more productive plating. More consistent anode-to-work relationship improves plating efficiency (Table 1). The drawing and comparison chart clearly illustrate capacity and work-to-anode differences. Jessup 732

Articles in this issue

view archives of Metal Finishing Guide Book - 2013