Selected articles from June 2006 issue published on TheFabricator.com:
Although most tube and pipe producers don't get too involved in the regrind process, it is crucial—reconditioning roll tooling can extend its useful life by 15 or 20 times. The regrind process reduces the producer's overall out-of-pocket tooling expenses, while helping to ensure the tooling continues to produce a consistent-quality product at the required speeds. A better understanding of the process, especially familiarity with the types of flaws that reconditioning can and cannot resolve, can go a long way toward a better working relationship between a tube and pipe producer and its regrind contractor.
The mechanical aspects of rotary draw tube bending haven't changed since modern tooling was developed 50 years ago. Likewise, the role of the tooling (mandrel, pressure die, bend die, and wiper die) hasn't changed. However, tube fabricators these days have many choices in regard to the tooling, especially wiper dies. Choices include material, rake angle, and whether the wiper die's feathered edge is fully machined or honed by hand.
After years of working in fabricating and machining, Shawn McFadden struck out on his own to start a fabrication shop, which later evolved into a custom motorcycle shop. He doesn’t use the latest CNC machines with digital readouts and other state-of-the-art manufacturing equipment. He uses manually controlled machines and ingenuity.
Five types of nondestructive testing are common for tube and pipe weld inspection, and each has advantages and disadvantages that may make one more suitable than another for your inspections.
Hydroforming has become a favored technology for automotive parts because it allows manufacturers to increase a component's strength, reduce its weight, and reduce the number of parts in an assembly. Another important benefit, one that is often overlooked, is the increase in design freedom this technology allows. Engineers and designers must be aware of the factors that restrict design freedom, such as material characteristics and press limitations, and alternatives such as annealing and axial feeding that help work around these limitations.
Rust, wear, and dirt cost tube fabricators and producers millions of dollars annually, and they can be the bane of tube processes. Analyzing the criteria for selecting the lubricant, cleaner, and rust preventative can help provide maximum protection.
Bud Graham revisits his January/February column on problems that plague tube mills (or nearly any manufacturing company, for that matter) and shares some reader feedback. Also, he provides the runners-up and winner of a caption contest for a photo that also appeared in the January/February issue.
Rovanco Piping Systems Inc. designs and fabricates piping systems for applications such as water (hot and cold), steam, and jet fuel. It sells fabricated pipe—typically with straight or miter end cuts—up to 36 inches in diameter. It provides preinsulated, high-temperature, low-temperature, and containment systems.
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