Solera, for instance, uses a lot of aluminum and some stainless. We also need to know what kind of metal the customer will be cutting. As you change to larger-sized nozzles, the gas consumption gets dramatically higher. “When they give the flow, the manufacturer typically provides it as a nozzle size. “How we size a system is that a manufacturer will give a minimum purity and the flow required,” said Shannon de Souza, president, CRU Air + Gas. The purity level, delivery flow, and nitrogen output all can be adjusted for a user’s requirements. The system is equipped to handle one to eight modules so that companies can ramp up their capacity as necessary. The same process then starts in the second vessel while the saturated container regenerates itself. This adsorption process continues until the activated carbon is saturated with oxygen molecules as the nitrogen-rich stream flows to the receiver. The system passes purified compressed air through one of the vessels, whereby the oxygen molecules in the air are adsorbed while flowing through the CMS. Each module has two pressure vessels filled with a carbon molecular sieve (CMS). So how does the process work? Solera’s system uses pressure swing adsorption (PSA) to generate nitrogen, a method that is becoming quite common.
But at a shop like Solera, working with ¾-in. Obviously, working with thin-gauge mild steel probably wouldn’t require this. If you are cutting thick materials that require an edge with no discolouration, and you are trying to reduce post-processing, this level of purity can be a real boon. Purity in on-site nitrogen generation has reached a stable 99.9995 per cent, which is greater than grade 5.0 (99.999 per cent pure). A big reason for this is how the technology has developed over the past decade and the cost advantages vs. The rising costs involved in getting bulk delivery of assist gases has encouraged shops like Solera to consider the use of shop air or in-house assist gas generation for laser cutting. Using that much nitrogen, a bulk pack delivery approach doesn’t make sense.” Nitrogen Generation Basics “Basically, we run our laser 9 to 10 hours a day. “It’s all about controlling costs,” he said. The system includes a BOGE low-pressure compressor, air treatment, Holtec pressure swing adsorption (PSA) nitrogen generator, and BOGE high-pressure booster system. Instead of purchasing bulk packs from a supplier, Singh invested in an on-site nitrogen generation system from CRU Air + Gas. It’s important to Singh that his team not do too much post-processing of parts, so he uses nitrogen to cut to ensure excellent edge quality with little to no oxidation.
Solera uses aluminum for all of its products, so the laser would be cutting aluminum from 40 thousandths to ¾-in. It was important to Singh that he control his cutting-related costs as well. With the laser, I have no tool setups, it doesn’t require an expert to manage it at all times, and there’s no need for dies or sharpening tools.” “The 6-kW fibre that I purchased replaced the three punch presses I had. “With the new facility, I decided it was time to move away from punching and invest in a laser,” he said. Here we see an example of Solera's products installed in Toronto - unique lighting designed and manufactured at the company's Mississauga facility.
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