Wheelabrator Skew Roll Machine Removes Rust, Scale
Cylindrical parts are conveyed through a blast machine on a specially designed skew roll-type material handling system.
Wheelabrator manufactures and installs standard and custom-designed blast systems for removing millscale and rust, and for profiling the surface of fabricated steel parts in preparation for protective coatings. According to the company, the Wheelabrator skew roll machine is a fully automated system designed to remove rust and scale from many cylindrical parts, including pipes, tubes, round bars, torsion bars, drill rods, rebars, gas cylinders and more. The machine is available with one, two or more blast wheels, depending on the application and cleaning rate.
Immersion tin and lead-free hot air solder leveling (HASL) coatings based on SnCu or SnAgCu alloys are widely used as surface finish materials for printed circuit boards (PCB). These coatings prevent the underlying copper from corrosion and preserve its solderability during lead-free assembly processes and for a long storage life of PCBs.
It has been shown that the inexpensive chemically accelerated vibratory surface finishing (CAVSF) process can reduce the average surface roughness.
Surface finish types for commercially supplied stainless steel sheet are detailed in various standards. ASTM A480-12 and EN10088-2 are two; BS 1449-2 (1983) is still available, although no longer active. These standards are very similar in that they define eight grades of surface finish for stainless steel. Grade 7 is “buff polished,” while the highest polish—the so-called mirror polish—is designated Grade 8