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Two cooling methods for high speed electric spindle

weifeng — Wed, 09 Oct 2019 06:23:13 +0000

Before, Star Wheel introduced to you that when the high-speed electric spindle is working, the built-in motor and the rolling bearing will generate a lot of heat during the rotation process. Because the electric spindle is compact, the gap is small, and the spontaneous heat dissipation effect is weak. If it is not distributed in time, it will cause different degrees of thermal expansion between the internal parts of the electric spindle, which will affect the performance parameters such as the stiffness and machining accuracy of the electric spindle, and will seriously affect the service life of the spindle. In this regard, Star Wheel will introduce two cooling methods for everyone.
     For the overall cooling of the electric spindle, there are usually two methods of liquid cooling and forced air cooling.
     (1) Liquid cooling means that the cooling water circulation is designed inside the electric main shaft, and a corresponding cooling machine is arranged outside, so that the cooling liquid circulates the internal heat inside the main shaft. The advantages of this cooling method are simple and reliable, and the cooling effect is more obvious. The disadvantage is that the cooling effect on the spindle core is relatively poor, and the cost of the cooling machine is relatively high.
     (2) Air forced cooling means that a forced convection channel is designed between the housing of the electric spindle and the motor stator. The heat generated by the motor enters the forced convection zone through heat conduction, and finally the heat is brought into the air to realize the electric spindle. Constant temperature work. Forced cooling of the air is pollution-free. If a static pressure gas bearing is used, the gas of the static pressure gas bearing can be circulated inside the main shaft to take away some of the heat of the motor.
     It is necessary to cool and cool the electric spindle, especially in high temperature weather. If you find that the electric spindle is overheated during the application process, you should consider whether to take heat dissipation measures. Do not let the electric spindle overheat. Operation, which in turn affects the service life.

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Do a good job in the use and maintenance of these electric spindles.

weifeng — Wed, 09 Oct 2019 06:22:12 +0000

The electric spindle is the core component of the high-speed machining machine. The correct use and maintenance of the electric spindle has an extremely important influence on the processing precision of the high-speed machining machine and the extension of the service life. We only remind you that the following points will be able to improve the use and maintenance of the electric spindle.
     1 Do not use compressed air to clean the electric spindle to avoid bringing dust into the gap of the spindle, thus damaging the spindle bearing;
     2 When cleaning the area around the electric spindle, although the spindle stops, the machine tool should be energized, and ensure that the spindle bearing is in the air curtain protection state;
     3 During the use of the electric spindle, note that the cutting fluid should be placed on the cutting tool, not on the spindle shaft end;
     4 The tool attached to the electric spindle must be cleaned regularly with a clean soft cloth to avoid dust from entering the spindle cone. Even if it is not used, a handle should be kept on the spindle to protect the spindle taper.
     5 new or more than one month of unused electric spindle, must start to work at low speed, it is best to pre-heat the spindle;
     6 In order to ensure the high precision of the electric spindle, only the precise dynamic balance standard tool can be used in high-speed operation. For high-precision cutting, it is best to preheat the electric spindle for 30 minutes to achieve thermal stability.
     If you can do the above in the process of using and maintaining the electric spindle, it is bound to achieve twice the result with half the effort, you may wish to try. Finally, the Star Wheel needs to remind you that the electric spindle can’t be overloaded under any circumstances, you must keep this in mind.

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How to reduce the error rate of electric spindle operation

weifeng — Wed, 09 Oct 2019 06:19:53 +0000

The failure rate of reducing the operation of the electric spindle is related to the proficiency of the operator. On the other hand, it is related to the steps of installation, cleaning and maintenance of the electric spindle. The star wheel is divided into three points to tell you how the error rate is. reduce.
     1. We need to connect the inlet and outlet pipes of the electric spindle according to the corresponding requirements. Also, if we have any water leakage, the cooling system must be continuously operated from the start to the stop. The coolant should be used separately. A water tank and the coolant is replaced every month. We need to match the power, frequency and voltage of the inverter and the electric spindle. The current of the inverter should be set according to the current of the motor spindle.
     2. When the electric spindle is being loaded, we need to clean the taper holes on the shaft head, and also clean the dirt on the upper surface of the spring chuck, so that the accuracy can be effectively prevented. To clamp the electric spindle nut, we must be careful not to use too much force. In addition, the bearing that contacts the ball has a speed limit, so the electric spindle cannot be overspeeded. If it is overspeed, the bearing of the precision contactor will burn out.
     3. If you hear an abnormal sound inside the electric spindle, then we must check him and touch the electric spindle for heat and vibration. If there is any, we have to carry out shutdown check, then look at the quality of the processing. stable.
     The above brief introduction helps you to control the error rate of the electric spindle operation from three aspects, and cooperate with the skilled skills of the staff. It is believed that the error rate can be greatly reduced, and it is also a kind of protection for the electric spindle.

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