High-speed motorized spindles are currently mainly used in high-speed engraving and milling machines and grinding machines. The reliable guarantee of high-speed operation of spindles and the selection of products are particularly critical. The current lubrication method is divided into: oil, oil mist, oil and gas. Grease lubrication spindle speed is not high, and are all bearings have been selected when packaged, for high-load operation of the electric spindle, this method of lubrication and profit, the advantage is the low input spindle cost. Oil mist lubrication: Actually, when the electric spindle design has only one lubrication inlet, this lubrication method is not conducive to a reliable and efficient supply of lubrication, excessive consumption of oil products and risk of contamination of the operating environment. The economic cost is not good. Oil and gas lubrication: Because the advantages of oil and gas lubrication are quite obvious, the current electric spindle design manufacturers are generally used. First talk about the requirements of oil and gas lubrication spindle: 1. Lubricant cleanliness level: 13/10 (ISO4406); 2. Air cleanliness: air filter accuracy of 0.01 microns; 3. Air dryness: dew point of +2 °C; 4 Bearing inlet pressure before the bearing nozzle: 2-3bar; 5 oil and gas transmission pipe: internal diameter of 2 to 2.5mm, with a small bend radius is not easy to bend the transparent pipeline is appropriate; 6. Oil and gas pipeline length: length in 1 ~ 4 meters is more ideal, in the distance from the terminal lubrication point spiral tube is conducive to deposit oil, when the bearing stops running again, it is conducive to rapid oil and gas in place, shorten the response time. In order to choose oil and gas lubrication products, we must first meet the above requirements. In addition, it is how the performance of oil and gas lubrication products can be achieved by delivering good oil and gas to electric spindles and achieve reliable and stable operation. 1. Precise dosing to oil, can adjust the amount of oil delivered to the bearing end each lubrication, range 5-40mm3. 2. Digital display time setting: It can realize arbitrary setting of oil feeding cycle time. 3. Pressure monitoring: Ability to monitor oil and gas delivery pressure or air source pressure, and prioritize monitoring of oil and gas pressure. 4. Oil status monitoring: Because the oil feeding rate per unit time of the spindle is small, the oil interval time is 3 min - 7 min, or even longer, so the stability of each oil lubrication point is an important indicator. 5. Bearing cavity pressure: The oil pressure should be adjustable. 6. Display and fault feedback: The product running status and the emerged faults have local display and remote feedback functions, such as: high and low air supply pressure faults, low liquid level, and oil supply faults. The above points are the guarantee for stable and reliable operation of the electric spindle. Therefore, in the selection of oil and gas lubrication need to carefully choose the right product.
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