Miss-forming of fin, wear of tools and irregular fin pitch (called "avec") of heat exchanger are the problems desired to be avoided, because of reducing the productivity and raising the costs on manufacturing heat exchangers for air conditioners. To cope with these problems, effects of the friction properties of coated aluminum fin stock surface on the formability of fin stock, the wear of tools and avec were investigated. The friction properties of fin stock surface are very significant for the problems. The coated aluminum fin stock having good friction properties, low friction coefficient, could increase the ironing formability, degrease the wear of tools and prevent from avec occurring, remarkably. Three measures to enhance the friction properties of coated aluminum fin stock are presented, by using water-soluble lubricant or wax. One is double coating system having top coating of water-soluble lubricant over hydrophilic coating. A second is double coating system having resin primer added with wax under hydrophilic resin top coating. A third is single hydro philic resin coating, which is added with hydrophilic lubricant.
展开▼
