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(2) Extra long X-stroke and gantry movement: Since the "wing" type is a slender part, the JoMach machine has an X-axis stroke of 30m and the Y-axis is only 2m. It is said to be used for processing Europe. The wing of a generation of fighter jets "Typhoon". The HyperTach machine has a maximum X stroke of 46m and a Y axis of only 2m. The British Marwin Alumax series has a total length of 100m on both sides. This long X stroke can only be moved by the gantry (often multiple gantry) without It may be that the workbench is moving.
(3) The use of linear motors for high-speed linear transmission: Unlike the previous helical gear racks or worm gears for large-scale machine tools in the aerospace industry, such high-speed milling machines also use linear motors. This is to meet the needs of the spindle's ultra-high speed, extra power and long X stroke. After using a linear motor, the HyperMach machine has a feed speed of up to 60m/min, a fast speed of 100m/min and an acceleration of 2g. According to CICINNATI, they tried to cut a thin-walled aircraft part on HyperMach and took only 30 minutes. . The same part takes 3 hours to process on a typical high-speed milling machine and 8 hours on a normal CNC bed. This fully demonstrates the power of ultra-high speed machines.
Another high-speed large-scale milling machine, LinX, introduced by the company in 2000 for the aviation and mold industry, is a bridge layout with linear motors. The maximum feed rate is 60m/min, the acceleration is 0.6g, and the spindle speed is 24000r/min. The power is 44kW. It is said that due to the high-speed spindle and high-speed feed, the machining time can be reduced by 50%, the machine structure is simplified, and the parts are reduced by 25%, which is easy to maintain.
The above description of linear motor applications has expanded from the initial automotive industry to the processing of electrical machining tools, the aerospace industry and large molds.
Not only that, in the IMTS2000 exhibits, sheet metal stamping machines and laser sheet cutting machines also use linear motors, such as Alabama's laser cutting machine, which uses a linear motor with a speed of 150m/min and an acceleration of 1.3g. The motor is also used in CMMs, such as Helmel's Mierostar HS products, with linear movement speeds of up to 30 m/min, so that the probe can make more than 120 contact measurements per minute.
Speeding up another key feature - the electric spindle has recently made the following new developments:
(1) Swiss company Fischer has introduced a product with an online automatic balancing device on the parts of the electric spindle. It is applied to the machining center, and the automatic balancing of the tool quality is performed once for each tool change. It is said that 80 to 90% of the vibration caused by dynamic imbalance can be eliminated in one second.
(2) Swiss IBAG Company introduced the electric spindle of hydrostatic bearing, which is said to have a service life of more than 20,000 hours.
(3) Ingersoll Corporation of the United States introduced the electric spindle of the hydrostatic bearing as a separate component.
(4) Swiss IBAG company introduced the electric spindle of the magnetic bearing.
(5) Swiss IBAG company is equipped with an axial size monitoring sensor on its electric spindle components, which can be coupled with the CNC system for axial dimension compensation.
(6) The electric spindle of the permanent magnet synchronous motor has also appeared. Previously, the motors of the electric spindles were all asynchronous induction motors. The stator heats up to cool, while the rotor heats up and cannot cool. However, the rotor of the permanent magnet synchronous motor does not generate heat for the permanent magnet. In addition, synchronous motors of the same power are smaller in size than asynchronous motors, which is advantageous for small size, high power, and increased power density (PowerDensity). However, only a few machine tool companies (such as Mazak) are currently developing. The professional electric spindle company has not seen any product supply.