New developments in the development of five-axis high-speed machining centers (3)
<br> <br> torque of the motor in high-speed machining centers, as well as the rotary table swinging fork of the spindle head and the rotary swing motion, etc., have been widely used in motor torque is achieved. A torque motor is a synchronous motor whose rotor is directly fixed to the component to be driven, so there is no mechanical transmission component, and it is a direct drive like a linear motor. The angular acceleration that can be achieved by a torque motor is six times higher than that of a conventional worm gear, and the acceleration can reach 3g when swinging a forked spindle head. Due to the extremely high static and dynamic load stiffness of the torque motor, the positioning accuracy and repeatability of the rotary and swing axes are improved. Previous page next page
At present, some manufacturers of high-speed machining centers have used linear motors and torque motors to drive linear axes (X/Y/Z) and rotary swing axes (C and A), respectively. Such as R?er's RXP500DS/RXP800DS, DMG's DMC75V linear and Edel's CyPort five-axis gantry milling machine.
It should be mentioned that the direct drive linear axis is combined with the directly driven rotary axis to give the machine a high dynamic performance and adjustment characteristics for all motion axes, thus freeing the mold for high speed, high precision and high surface quality. Surfaces provide the best conditions.
Control System
The CNC control system is an important part of the high-speed machining center, which determines the speed, accuracy and surface quality of the machine tool to a large extent. Therefore, the performance of the numerical control system is of particular importance for high-speed machine tools that process free-form surfaces of molds.
When machining high-precision free-form surfaces, the tool path consisting of micro-segment lines and arcs creates a huge part program. These data streams need to be stored and processed by the machine control system. Therefore, the length of the block processing time determines the CNC control system. An important indicator of work efficiency. At present, the processing time of the high-end CNC control system is generally 0.5ms (such as HEIDENHAIN's iTNC530 CNC system), and the processing time of the individual CNC system has been shortened to 0.2-0.4ms.
Modern CNC CNC systems for high-speed machining of molds, in addition to the short program processing time necessary to ensure high-speed feed rates, should also have Nurbs and spline interpolation functions, and can work at nano resolution. In order to achieve high machining accuracy and surface quality in the case of high speed machining.
At present, high-end CNC systems can also be connected to CAD/CAM systems from different manufacturers, and data is transferred from the CAD/CAM system to the control system via Ethernet at a very high speed. The integration of CAD/CAM into the control system can, to a large extent, achieve good results in the processing of complex contours of the mold, and contributes significantly to shortening the adjustment time and programming time.
In the above-mentioned five-axis high-speed machine tool, except for R?er, which uses its own CNC system, the other mainly uses Siemens 840D and HEIDENHAIN iTNC530 CNC system.