The spindle parts of CNC lathes must not only meet the requirements of high accuracy during finishing, but also meet the requirements of high-efficiency cutting during roughing. At the same time, the spindle parts of stainless steel CNC lathes should have higher dynamic and static stiffness and resistance to thermal deformation. The requirements of CNC lathes for spindle parts are as follows:
1. The rigidity of the stainless steel CNC lathe should be high enough
When the stainless steel CNC lathe is working, it usually adopts high-speed and strong cutting, which requires high rigidity of the spindle parts. Otherwise, the spindle will produce large elastic deformation under the action of external force and cause vibration, which will affect the accuracy and surface roughness of the machined parts.
2. The rotation accuracy of stainless steel CNC lathe should be high
The co-rotation accuracy of the spindle parts of the stainless steel CNC lathe refers to the radial run-out and axial run-out measured by a dial indicator on the positioning surface of the workpiece, fixture or tool on the front end of the spindle at low speed with no load. Its level directly affects the geometric accuracy and surface quality of the machined parts. Therefore, the spindle parts of stainless steel CNC lathes must have high rotation accuracy.
3. Good vibration resistance of stainless steel CNC lathe
The vibration resistance of spindle parts of stainless steel CNC lathe refers to the ability of the spindle parts to resist vibration and maintain balanced operation during CNC machining. If the CNC machine tool vibrates, it will affect the surface quality of the workpiece, tool durability and service life of spindle bearing. It will generate noise and affect the working environment.
4. The stainless steel CNC lathe should have strong thermal stability
The thermal stability of the spindle part refers to the ability of the spindle part to resist the change of shape and position due to heat. The stainless steel CNC lathe will generate heat due to friction, oil stirring or other reasons during operation, which will cause the temperature of the spindle parts to be fluctuated, and the shape and position of the spindle parts will be distorted, thereby affecting the machining accuracy.
5. Long accuracy retention of stainless steel CNC lathe
The accuracy retention of spindle parts refers to the ability of the spindle to maintain the original manufacturing accuracy for a long time. CNC machine tools are expensive. In order to speed up the investment recovery of CNC machine tools, it is necessary to maintain a high operating rate of CNC machine tools. At the same time, it is hoped to extend the service life and reduce the number of maintenance, which requires that the spindle parts of the stainless steel CNC lathe must have good accuracy retention.
6. Reliable and accurate positioning of stainless steel CNC lathe
The structure of the spindle parts of stainless steel CNC lathes should ensure reliable radial positioning accuracy and axial positioning accuracy so as to ensure reliable clamping of workpieces or tools and accurate positioning, and reduce the influence of clamping errors and positioning errors on machining quality.
7. Other requirements for stainless steel CNC lathes
For CNC machine tools that need automatic tool change, the spindle parts often also require functions such as automatic loading and unloading of tools, chip blowing and oriented spindle stop so as to meet the requirements of stainless steel CNC lathes on improving the level of automation and shortening auxiliary time.