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Sawing/Cutting

Problems solved

By Paul Beha, products manager, HE&M Saw

Above: This custom saw can split long I-beams containing internal stresses into two T-beams.

Uncommon requirements drive custom designs

December 2019 - Saws straight out of the catalog are designed for standard jobs. Not every job is standard, however. Challenging requirements demand custom equipment and, sometimes, designers and engineers must put their heads together to develop creative solutions to unusual problems.

Radioactive

In the early 1990s, a facility that had produced plutonium for nuclear ordnance since the 1950s was decommissioned in Colorado. During deconstruction, over 800 structures were demolished and 21 tons of weapons-grade material was removed. The demolition resulted in 1.3 million cubic meters of waste. Much of that waste was compressed into 3-foot cubes and buried.

The buried material later had to be dug up, then properly contained for disposal because of environmental contamination. The compressed cubes contained identifiable objects—a chair leg, a light bulb, a stapler—and had to be chopped into pieces small enough to fit into 55-gallon drums. Because the material was hazardous and radioactive, it could only be processed in a radiation containment facility, isolated within 3-ft.-thick walls. The only access into the work area was a standard-size service door.

A saw that can handle a 3-ft.-square block cannot fit through a standard door, so our engineering team designed a machine that could be dissembled by the customer, carried through the door and then reassembled. Incidentally, due to the risk of radiation exposure, the saw operators could only work for a fraction of their eight-hour shift, a mere 30 minutes, due to the risk of radiation poisoning.

While there was well-documented contamination released from this plant over the years since the Cold War, an article published in a local newspaper on Oct. 3, 2019, stated that after more than 100 samples of soil were taken, the U.S. Fish and Wildlife Service, which oversees the site, determined that contamination levels were no longer a risk to human health.

FFJ 1219 sawing image1

Slices sawed from large aluminum billets are tested for metallurgical consistency and then remelted.

Big billets

Another unusual project was for an aluminum producer that provides material to an airframe builder. The manufacturer requires cast aluminum billets that are 9 ft. long, 25 in. high, 70 in. wide and weigh 19,600 lbs.

FAA requirements for the airline jet manufacturing industry mandate that the billets must be tested for metallurgical consistency. To accomplish this, the products selected for testing needed to have 1-in.-thick slices removed from each end and from the middle. There is no standard saw that will cut 70 in. across, so HE&M designed and built two saws that could handle the job. After the cutting and documentation is complete, the aluminum company re-melts the test pieces. Interestingly, those 25-in.-thick slabs of aluminum are rolled under heat and pressure down to 1⁄16 in. thick and end up as the skin on large aircraft.

Automated at high speed

A company that builds recreational vehicles and fifth-wheel trailers needed two saws for a production facility that produces 1,200 chassis per day, each containing many components that had to be cut.

The saws needed to be fully automated, since they were going to be operated remotely for 24 hours a day, six days a week; robust to handle three 40-ft. beams at the same time; and fast to complete the cutting of all three beams in 350 seconds. The production requirements meant that multiple parts had to be cut simultaneously and very precisely because other processes using robotics followed the sawing. Square tolerance requirements were 0.10 mm, and overall length was required to be within 2.5 mm, which are rather tight tolerances given the fast process cycle times.

Because very little hands-on activity was to be performed by humans, the entire process was integrated into a computerized, automated system. The saws included time-saving features specific to the client’s needs, such as an automated “end stop” that squared the beams. The end stop was automatically replaced by a cutting block as the sawing sequence began, and an automated conveyor removed the trim cut ends of the beams.

Tough tasks

A metals processor came to HE&M requesting a saw that could split long I-beams into two T-beams, which are widely used in commercial architectural projects. The I-beams contained internal stresses that required torches to be positioned alongside the saw to alleviate the stresses. This allowed the company to split the beams in a way so that the material did not close up and pinch the blade.

These requirements required a solution to be built from scratch, including material-holding solutions. Holding the beams down vertically and from the sides horizontally is a challenge when the part is moving through the stationary saw blade.

A separate client needed a saw that could cut highly flammable, exotic materials safely. For this customer, the metal chips that resulted from the sawing had to be continuously controlled by submersion, and all components had to be continuously rinsed with high-pressure flushing to reduce the chance of a fire. Normal components like the chip bin, coolant tank and coolant system, splash guards and areas where chips traditionally build up had to be custom designed to control all aspects of the sawing operation and avoid a fire.

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There is no room for errors with a saw that must cut through live explosive ordnance.

Bombs away

HE&M also has manufactured a saw capable of cutting live explosive ordnance for an aerospace and defense company: bombs weighing up to 400 lbs. This saw design project had no room for error. The machine was designed to minimize metal-on-metal contact to lower the risk of setting off the bombs during sawing. Any mistake here would have been catastrophic.

The saw operator was remotely located 400 ft. from the equipment, just in case.

Special care was required in designing all fasteners to prevent them from becoming a projectile if explosive material accumulated. If this occurred and a maintenance procedure required component disassembly, a bolt could become a deadly weapon if a wrench made contact. The quality assurance department required all cast components to be X-rayed to ensure inclusions were minimal and to a strict standard to reduce explosive buildup from minuscule particles that were created during cutting. Any pocket that could trap and collect explosive material would essentially be creating a secondary bomb.

Over HE&M’s 55 years manufacturing band saws, it has frequently built custom equipment because many applications go beyond what a standard model can do. FFJ

Sources

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