Spindle Chiller–
cooling suitable for many applications

Whether milling, grinding, turning or other applications - when using a machine tool spindle like a HYFRA spindle chiller, its cooling is indispensable. The motor spindles of modern machine tools in particular often operate at high speeds. Since this leads to strong heating in the area of the bearings and on the motor, the spindles are cooled with liquids or air. In this way, their high performance can be maintained over longer periods without overheating.

Water has long proven its worth as a coolant for the spindle of a machine tool. It is usually fed into the housing of the spindle via a pipe system, where it absorbs the heat around the stator and in the area of the bearings. Sometimes the cooling water also reaches the shaft and the tools and workpieces via a rotary union at the transition between the stator and the rotor. In either case, a spindle cooling system must deliver coolant to the spindle reliably and uniformly over extended periods of time. Since machine tool spindles achieve their optimum performance only within a relatively narrow temperature range, their cooling also requires high temperature accuracy and temperature consistency.

For these requirements, the HYFRA range offers reliable cooling water recirculating chillers in different capacities, sizes and equipment. In the HYFRA Sigma series, the product range extends from units with a cooling capacity of 5 kW (1.5 tons) to particularly powerful chillers with 320 kW (90 tons) capacity. The compressors and plate heat exchangers of the chillers are characterized by high efficiency and the space required for installation remains manageable. Up to an output of 28 kW (7.5 tons), the units require only 0.5 m² of floor space, while higher outputs require 1 m² (up to 80 kW/22.5 tons), 2 m² (up to 160 kW/45 tons) or 4 m² (up to 320 kW/90 tons). The HYFRA Sigma c variant with reduced overall height is also available.The models of the HYFRA eChilly/eChilly+ series also provide reliable cooling of the spindle with outputs from 1 kW to 6 kW kW (3,500 Btu/hr to 20,500 Btu/hr). These particularly compact cooling water recirculating chillers require only 0.3 m² to 0.6 m² of floor space and have overall heights between 37 cm and 52 cm (15 inches to 21 inches). This means they fit into almost any machine layout. At the same time, the robust housing and integrated air filter protect the small chillers even in demanding environments.