MM Science Journal, March 2009

Thermomechanical transfer functions and control of a machine tool cooling system

J. Hornych, P. Barta, M. Mares
Keywords: Thermomechanical transfer function | thermal error | Machine tool

Nowadays the cooling systems are more than ever applied into the structure of a machine tool, but unfortunately there are no efforts being made in the control of the cooling systems, which doesn’t allow complete utilisation of their possibilities. This paper presents active cooling control (ACC) system, based on thermal transfer functions, which was experimentally tested on an inbuilt cooling jacke (…)

Automatic On-Machine Measurement of Complex Parts

J. Zeleny, M. Janda
Keywords: Machining | accuracy | on-machine measurement

Milling spindles with inserted 3D tensometric touch probes were applied for on-machine measurement of highly precise parts produced on three - and five-axis milling machines equipped with linear motors and direct rotary drives. New methods of CNC control of angular NC axes during measurement were developed for parts containing hardly accessible surfaces. In-process calibration of multi-directional (…)

Machine tool with undisturbed frame

J. Sveda, Z. Sika, M. Valasek
Keywords: Machine tool | linear motor | vibration suppression | control loop

One of the main disturbances of the machine tool frame is caused by operation of motion axis. Movement of high dynamic motion axis is connected with powerful force strokes that excite machine tool frame vibration and deteriorate machining surface quality and productivity. There are several possibilities how to suppress this vibration. One possibility is to use suspended motor, where the motor is co (…)

Energy Consumption Forecasting and Optimisation for Tool Machines

A. Dietmair, A. Verl
Keywords: Energy Efficiency | Virtual Prototyping | Machine Optimisation

Soaring energy prices, signs of a human-made climate change and legislative pressure have brought the energy consumption of machines to the attention of machine tool builders and their customers. To enable manufacturers and operators of machines to include energy consumption into their considerations in an objective way, we introduce an efficient method to model the energy consumption behaviour of (…)