Lorenz Hoffmann GmbH, a mechanical engineering company based in Kressberg, Germany, is revolutionizing CNC milling precision with the help of advanced vacuum technology from Busch Vacuum Solutions. The company, led by Andreas and Christina Hoffmann, has been at the forefront of producing high-precision prototypes and small-series components for industries like automotive, medical technology, and machine building for over forty years.

The key to their precision lies in the vacuum clamping of workpieces during the milling process. With CNC milling machines that rotate up to 40,000 RPM, ensuring the workpieces are fixed with micrometer accuracy is essential. To optimize this system, Lorenz Hoffmann transitioned from oil-lubricated rotary vane vacuum pumps to a single COBRA PLUS dry screw vacuum pump. This upgrade not only saved 3,500 kWh per year but also provided better holding power and more reliable operation. The COBRA PLUS is speed-controlled, adapting its power based on real-time demand, improving energy efficiency across multiple machines.

In addition to energy savings, the switch to the COBRA PLUS vacuum pump has improved working conditions. The machine operates at a quieter 63 decibels, compared to the previous 72 decibels of four rotary vane pumps, significantly reducing noise in the production hall. Furthermore, the pump’s waste heat is repurposed through a heat recovery system to help heat the production hall during winter, reducing the need for heating oil.

Lorenz Hoffmann also benefits from Germany’s energy-efficiency initiatives, receiving 40% reimbursement on the COBRA PLUS purchase through BAFA funding. For Hoffmann, the integration of vacuum technology has not only enhanced precision but also driven energy savings and sustainability. “The purchase of the COBRA has paid off for us twice over,” says Hoffmann, showcasing the financial and environmental advantages of the upgrade.

www.buschvacuum.com

FA milling tool removes metal chips from a workpiece.

A COBRA PLUS supplies four CNC milling machines with the required vacuum.