Balancing Machine for Turbocharger Turbine Rotors
210 FBLS | 410 FBLS

Range of application
Measurement and correction of un-balance in machined turbocharger turbine rotors. Use of the machine in mid- to high-volume production. Fully automatic unbalance measurement and correction in two planes and in up to two correction steps. Manual loading and unloading.

Design
Two-station machine with measuring and correction station and fully automatic operating sequence. Vertical balancing unit on a vibration-optimized machine frame of aluminium profile, type-dependent, exchangeable precision air-bearing support for the turbine rotor, drive through a drive-plate with air-jet adapted to the rotor diameter.

Measured data processing by CAB 750 measuring unit.

Correction station configured as a vertical traversing-stand machining center, with CNC machining unit for unbalance correction by polar milling on the hub-side and at the rear of the turbine rotor. Integrated tool changer with 12 tool positions.

Sequence of operations

• The work-pieces are removed from the conveying equipment, provided with a reference mark and inserted into the measuring station
• Automatic measuring run. Calculate and transfer the processing values to the correction station, brake to a stop
• Remove the rotor from the measuring station and load it into the correction station, align the reference mark
• Automatic correction: clamp, select the right correction tool, index to the correction position and mill the 1st plane. Index to the correction position for the 2nd plane, repeat the milling process and unclamp
• Transfer the rotor to the measuring station and start the check run. If the unbalance after the 1st correction step is not in tolerance, a 2nd correction step can be carried out
• Remove the work-piece and place it on the conveyor

Fully automatic unbalance correction in two planes by milling on the hub and at the rear of the turbine rotor. This allows a large amount of material to be removed in a short time in case of high initial unbalance.

The rotor is supported by an air-bearing support system and driven by non-contacting means with the air-jets. A lifting-loader is integrated for simple and gentle loading and unloading of the rotor.

The measuring unit with digital signal processor has an ergonomic, graphics-capable monitor and an integrated keyboard. An easy-to-use operator interface, largely automated set-up procedure and diagnostic programs simplify the operation. Software modules for calculating standard and complex correction methods are installed. Further features are: large rotor data memory, statistics software, external interfaces.