12/14/2022 0 Comments Hangsterfer?s pc 45 cutting![]() When that contamination occurs, foam may not be present immediately but will eventually appear. “It’s when that foam hangs on that you have problems, and you don’t have the right chemistry in place for that system.”Īnother cause of foam is tramp oil that enters the sump and reacts with the metalworking fluid. “As long as you’re breaking the foam faster than you’re creating it, the system will operate well and be in good equilibrium,” he said. He noted that, in laboratory simulations, as long as the bubbles break within 30 to 45 seconds of forming, foam problems in production environments shouldn’t occur, but that’s not the case if foam persists for more than 2 minutes. Large bubbles break faster than small ones, according to David Gotoff, product manager, metalworking for Chemetall, New Providence, N.J. “You can get some pretty big bubbles and poor heat transfer if you don’t have the right coolant,” he said. ![]() Wiley, business development manager for metalworking fluids manufacturer QualiChem Inc., Salem, Va. In those systems, the large volume of coolant returns from the machines and the resulting turbulence creates a significant amount of aeration, which must be minimized to reduce foaming, explained John S. “We’ve had customers use some of our fluids that have a fairly high foam potential with high-pressure delivery without producing foam due to the machine design,” he said.Īlthough a small sump on an individual machine tends to exacerbate foaming, large central coolant systems are not immune. However, he added that users with a sufficiently sized sump do see the benefit. There are fewer machines with a large enough sump to allow the fluid sufficient time to rest before it’s pumped again, concurred Randy Templin, vice president, customer service for the Americas for coolant manufacturer Blaser Swisslube Inc., Goshen, N.Y. “The smaller the sump, the more times that sump is being turned over, so the less time the foam has to dissipate in the sump.” sumps,” said Steve Badger, DeWitt, Iowa-based chemist for ITW Rocol North America, Glenview, Ill. The trend, however, is toward smaller coolant sumps in machine tools with high-pressure delivery systems to reduce the footprint. For example, a 50-gpm filter system would require a 500-gal. The coolant manufacturer recommends an “ideal” fluid retention time of 10 minutes to minimize turbulence and maximize filtration. In addition, a sufficiently large fluid reservoir is needed to prevent pump cavitation and supply enough fluid based on machine tool horsepower, the report noted. Those applications can have foaming problems because a high-pressure pump with rapid fluid circulation can severely agitate coolant, which requires inherently low-foaming fluids, stated Cincinnati-based Cimcool in a technical report titled “High-Pressure Delivery of Metalworking Fluids.”įoam produced by a high-expansion foam system, which delivers a foam blanket to extinguish fires. ![]() This article focuses on combating foam, particularly when applying high-pressure coolant, which is typically from 1,000 to 1,200 psi with higher pressures possible. They are rust, residue, dermatitis, foul odors and foam. Controlling foam when applying high-pressure coolant requires trade-offs to achieve effective metalcutting.įive deadly sins are related to metalworking fluids, according to Dave Enright, industry manager for metalworking fluids, Chemetall.
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