HOW TO DRY PARTS AFTER MASS FINISHING

摘要

We make steel stampings from 10 gage CRS. They weigh an average of 120 grams (1/4 lb) each. The parts are deburred in a through-feed vibratory finisher at a rate of 1,200 parts/hr. After de-burring, they free fall into large, unlined, cardboard boxes. We have shipped these boxed parts for years to domestic customers with no corrosion problems. Now, some of our customers have moved their assembly plants to Mexico and other distant sites and the parts are showing signs of rust by the time they are unpacked-maybe as much as a month after we ship. One of our vendors suggested dipping the parts in a solvent based, water displacing inhibitor. We sent samples of dipped parts to three customers and two of them rejected the process because it adds a cleaning step at their end. We are now investigating a dryer to follow the vibratory operation so the parts will be packed dry. Can you suggest the best method for drying following deburring?