In order to reduce the auxiliary time and increase the efficiency, it is required that the starting and stopping time of the main shaft of CNC machine tool CNC Mechanical and electrical engineering be as short as possible, so high starting and stopping plus (minus) speed is required. At present, the start-up and stop acceleration of the main shaft of CNC Mechanical and electrical engineering of overseas machine tools can reach above LG, and the time of full speed start-up and stop is within 1 s.
The CNC mechanical and electrical engineering spindles made by these companies have the following characteristics compared with those made in China: high power and high speed; high-speed and high rigidity bearings are selected; high-speed and high rigidity bearings are selected for overseas high-speed and compact spindles, with the emphasis on ceramic bearings and liquid dynamic and static pressure bearings; air smooth bearings and magnetic bearings are selected for unique scenes; The process level of careful processing and equipment is high; the level of supporting control system is high. These control systems include rotor automatic average system, bearing oil and gas smooth and careful control system, stator and rotor cooling temperature careful control system and spindle deformation temperature compensation careful control system, etc. On this basis, these foreign manufacturers, such as the United States, Japan, Germany, Italy, Switzerland and other industrialized countries, have made a variety of commercialized high-speed machine tools.
Development trend of spindle technology in CNC Mechanical and electrical engineering
A
Continue to develop towards the goal of high speed and high rigidity
Due to the demand of high-speed CNC machining and essential use, with the development of spindle bearing and its smooth technology, careful machining technology, careful moving average technology, high-speed cutter and its interface technology and other related technologies, the high-speed spindle of CNC Mechanical and electrical engineering for CNC machine tools has become the current development trend, such as CNC Mechanical and electrical engineering for drilling and milling, ibag in Switzerland The speed of hf42 reached 140000 R / min, and that of d1733, a PCB drilling machine of westwind company in the UK, reached 250000 R / min. The main shaft of CNC Mechanical and electrical engineering for machining center was 42000 R / min for Fischer in Switzerland and 75000 R / min for camfior in Italy. In terms of the system rigidity of CNC Mechanical and electrical engineering spindles, the system rigidity of CNC Mechanical and electrical engineering spindles is increasing due to the development of bearings and their smooth technology, which meets the needs of the development of CNC machine tools in high-speed, high-efficiency and precision machining.
B
Towards the goal of high speed, high power, low speed and high torque
According to the demand of essential application, numerous CNC machine tools can meet the requirements of Heavy CNC machining and high-speed CNC machining at the same time. Therefore, the CNC Mechanical and electrical engineering spindle of machine tool should have the performance of low speed, high torque and high power. The main shaft of CNC Mechanical and electrical engineering for machining centers made by camfior, step Tec of Switzerland and GMN of Germany is satisfactory. It is not difficult for the main shaft of CNC Mechanical and electrical engineering of Cytec of Germany to transmit torque above 200 N · m in low speed section. The main shaft of CNC Mechanical and electrical engineering of CNC milling machine and lathe of Cytec of Germany has reached 630 n · m in large torque, and in high speed section, it is usually at 10-50 kW; The great transmission power of cyteccnc CNC CNC Mechanical and electrical engineering spindle is 50 kW; the great power of Swiss step teccnc mechanical and electrical engineering spindle is 65 kW (S1), which is used for aircraft manufacturing and mold processing; and the report of CNC Mechanical and electrical engineering spindle power reaching 80 kW is more.
C
Further development to the goal of high precision, high reliability and long working life
Users put forward higher and higher requirements for the accuracy and reliability of CNC machine tools. As one of the core performance components of CNC machine tools, CNC Mechanical and electrical engineering spindle requires higher and higher accuracy and reliability. For example, the radial runout of the main shaft is within 0.001 m m, and the axial positioning accuracy is below 0.5 μ M. At the same time, the service life of CNC Mechanical and electrical engineering spindle has been lengthened and its application reliability has become higher and higher due to the selection of special and careful spindle bearing, advanced smooth mode and unique preload application mode. Step TEC’s CNC Mechanical and electrical engineering spindle is also equipped with acceleration sensor to reduce the vibration acceleration level of bearing. In order to monitor and limit the vibration on the bearing, a vibration monitoring module is installed to prolong the working life of CNC Mechanical and electrical engineering spindle.
D
The performance and mode diversification of the spindle’s built-in electromechanics in CNC
In order to meet the demand of essential use, the performance of spindle motor in CNC Mechanical and electrical engineering has been improved. For example, the ratio of constant torque and high speed to constant power and high speed (i.e. constant power speed regulation boundary) delivered by Fischer spindle motor in Switzerland has reached 1:14. In the rest, permanent magnet synchronous motor CNC Mechanical and electrical engineering spindles appear. Compared with asynchronous motor CNC Mechanical and electrical engineering spindles of the same power, the appearance size of synchronous motor CNC Mechanical and electrical engineering spindles is small, which is conducive to increasing power density and completing small size and large power rate.
E
Start and stop the response quickly
In order to reduce the auxiliary time and increase the efficiency, it is required that the starting and stopping time of the main shaft of CNC machine tool CNC Mechanical and electrical engineering be as short as possible, so high starting and stopping plus (minus) speed is required. At present, the start-up and stop acceleration of the main shaft of CNC Mechanical and electrical engineering of overseas machine tools can reach above LG, and the time of full speed start-up and stop is within 1 s.
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