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Lehmann-UMT filter systems are real game changers - reliable supply of several grinding machines with oil in 3-shift operation and unmanned over the weekend.
Central system for tool grinding - a new approach to filtration
In 2019, WERKÖ GmbH, a manufacturer of high-quality precision tools, decided to move to a new location with more space to meet the needs of its customers. In order to further increase the usual high level of processing, the company tapped into existing optimization potential in the preparation of the cooling lubricants used.
Lehmann-UMT was quickly found as a partner with the necessary expertise for such demanding projects. One of the challenges was that WERKÖ works with materials such as carbide and HSS. The particles produced during the machining process cannot be filtered to 2 µm with an off-the-shelf filter system, as they place the highest demands on the filtration process. The company therefore opted for a custom-fit high-performance filter system from Lehmann-UMT, which reliably supplies several grinding machines with oil.
Low wear in 3-shift operation
The central filter system from Lehmann-UMT processes the coolant used in an energy-efficient manner, ensures a filter fineness of 2 µm and cools the grinding oil to guarantee optimum production. The advantages of the system, which is individually tailored to the customer, are very clear: "The system runs with extremely low wear in 3-shift operation and unmanned over the weekend," says T. Jahn from WERKÖ GmbH. This results in savings in personnel costs, low service and maintenance costs and top production quality.
Multi-stage filtration ensures 20 % more performance and 10 % energy efficiency
Thanks to multi-stage filtration, the system impresses with a filter capacity of 500 l/min at a filter fineness of 2 µm in the field of carbide and HSS machining. The filter system consists of a magnetic filter that removes the ferromagnetic chips. This removes the main dirt load from the process in an extremely energy-efficient manner. An inclined lamella separator is used as a second filtration stage. By using natural gravity, the particles in the fluid sink downwards and are deposited at the bottom of the tank. They are then discharged fully automatically using a scraper system. The fluid then enters the StingR® fine filter, which filters out all particles down to a size of 10 µm. LEHMANN-UMT's Edge technology ultimately ensures the required filter fineness of 2 µm.
The backwashed particles from StingR® and Edge are separated and discharged in a concentrator. The precise filtration not only extends the service life of the cooling lubricant, processing machines and tools, but also reduces the occurrence of grinding burn in the process.
Sustainability - for clean processes
The filter system is characterized by maximum energy efficiency, as the system works primarily with energy naturally occurring in the environment (such as magnetism and sedimentation). It impresses in the most demanding processes with a long service life and low wear. Mr. Jahn from WERKÖ GmbH describes his experience: "Since the filter system was commissioned four years ago, it has not yet been necessary to replace any components due to wear." The long service life and low spare parts requirements conserve resources and protect the environment.
What is the conclusion?
"Clean cooling lubricants are the prerequisite for a long service life of our CNC grinding machines, good service life of the grinding wheels used and, of course, decisive for the outstanding quality of our products," confirms T. Jahn. In conjunction with the processing machines, unmanned production takes place over several days under these conditions. Mr. Jahn sums up: "All in all, we made exactly the right decision in 2020 - we rely on filter systems from Lehmann"
