The design of the spindle and the rolling bearing of the CNC machine tool are very important for the overall performance and machining accuracy of the machine tool. At present, the design of the spindle and rolling bearing of the CNC machine tool is mainly based on several basic requirements:
1. A sufficient rigidity should be ensured. In order to ensure that the shape and positional accuracy of the machined workpiece are constant, the spindle should have a certain dynamic stiffness and torsional stiffness in the rotary direction and axial direction.
2. A high dynamic response should be obtained. The high speed of the spindle should be ensured while ensuring a certain rigidity. According to the kinematic law of the machine tool, the speed of the spindle is generally designed to be 3~2 times higher than the speed of the cutting tool when the spindle is in free state.
3. The bearing should have a low friction coefficient and a high reliability. The friction coefficient of the bearing directly affects the speed of the spindle, so the bearing should have a low friction coefficient and a high service life.
4. The spindle should be of a smaller size and lighter weight design. In order to reduce the overall size and weight of the machine tool, under the condition of meeting the above basic requirements, the spindle should be designed to have a smaller structure and a lighter weight.
Therefore, when designing the spindle and rolling bearings of the CNC machine tool, these basic requirements should be considered in order to ensure that the machine tool has a good dynamic performance, a reliable bearing and a smaller size.
