The selection and function of the machining center spindle are critical to the performance and efficiency of the machining center. The following is a detailed analysis of the selection and function of the machining center spindle:

1. Selection of machining center spindle
1. Spindle Type Selection
There are three types of spindles commonly used in machining centers: belt spindles, direct-coupled spindles, and electric spindles.

Belt spindle: widely used, the speed generally does not exceed 8000 rpm, the higher the speed, the greater the noise. However, it is rigid and suitable for heavy cutting, so it is widely used in large machining centers. Some require the addition of a gearbox to increase the torque of the spindle.
Direct-connected spindle: It is more commonly used in high-speed machining centers and drilling and tapping centers, and the speed can usually reach 12,000 rpm. The rotation speed is inversely proportional to the cutting force, and the higher the speed, the smaller the cutting force, so the cutting force of the direct-connected spindle is not as good as that of the belt spindle, but it is more stable and suitable for processing workpieces with high surface finish requirements.
Electric spindle: It is a new type of spindle with a very high rotation speed, but the cutting force is relatively small. It is suitable for fields with high requirements for workpiece surface quality and finish, as well as fields with fast dynamic response to linkage processing, such as impellers and precision molds.
2. Rotational speed and load capacity
According to different processing materials, tools and processing methods, it is necessary to choose spindles with different rotational speeds. The speed control of the spindle of modern machining centers generally adopts frequency conversion or servo control to achieve precise control.
The load detection function of the spindle is also very important, which can detect the load of the spindle in real time through sensors, eliminate machine tool faults in time, protect the machine tool and extend the service life.
3. Cooling system
The spindle will generate a lot of heat during processing, and effective cooling measures must be taken. Commonly used cooling methods include air cooling, water cooling and oil cooling, among which water cooling is relatively cost-effective.
4. Accuracy and Stability
: Precision machining and mold processing have high requirements for the accuracy and stability of spindles. Therefore, when selecting a spindle, it is necessary to consider whether its machining accuracy and stability meet the requirements.
2. Functions
of machining center spindle 1. The rotary machining tool
spindle allows the machining tool to rotate at high speed to achieve various machining operations.
2. Control feed The
spindle has the function of controlling the feed volume, and the processing and cutting of materials are realized by controlling the rotation speed of the spindle and the feed speed of the machining tool.
3. Support and positioning
The spindle can also support and position the workpiece, ensuring machining accuracy and machining quality.
4. Load protection
The spindle has a load protection function, and if the load is too large during the machining process, the spindle will automatically stop to avoid equipment damage.
3. Practical Application Cases
Take the YASKAWA VS-626VM3 servo spindle as an example, which demonstrates its high precision, high speed, and perfect protection functions in machining centers. Composed of a high-speed AC spindle motor with digital vector control and a transistor controller with regenerative braking, the VS-626VM3 servo spindle is capable of delivering a high speed of 8000r/min with fully digital high-precision position and speed control and perfect protection functions. This spindle excels in automatic tool change performance, greatly improving the machining efficiency and accuracy of the machining center.

In summary, the selection and function of the machining center spindle have an important impact on the performance and work efficiency of the machining center. When selecting a spindle, it is necessary to select the most suitable spindle type, speed, load capacity and cooling system according to the specific processing needs and processing occasions. At the same time, the spindle needs to be maintained on time during use to maintain its normal operation and extend its service life.