Improving the machining accuracy of CNC vertical lathes is a comprehensive task involving many aspects. The following are some suggestions and methods that can help you improve the processing accuracy of CNC vertical lathes:

1. Machine tool foundation stability: The CNC vertical lathe foundation is an important carrier for the operation of the CNC system, and its stability directly affects the machining accuracy. Therefore, it is necessary to ensure that the machine tool foundation is far away from the vibration source and set up reasonable anti-vibration grooves to control the stability of the machine tool foundation.

2. Optimize CNC programming: Programming is a key link in CNC vertical lathe processing. It is necessary to ensure comprehensive and reasonable optimization of the programming origin, and to clarify the rationality and efficiency of the processing route. At the same time, according to the specific needs of the parts, operations such as tool retraction and tool advance are reasonably planned to control the error within an acceptable range.

3. Machine tool system error compensation: CNC vertical lathe pitch error is one of the key factors affecting machining accuracy, so pitch error compensation must be done well. In addition, attention should also be paid to other system errors, such as XYZ axis backlash compensation, spindle axial and radial movement, etc., and corresponding adjustments and optimizations should be made.

4. Selection of tools and fixtures: Selection of reasonable tool materials and angles, as well as appropriate fixture methods for CNC vertical lathes, is crucial to improving processing accuracy. This requires comprehensive consideration based on the material, size and characteristics of the machined parts.

5. Process analysis: Before processing the CNC vertical lathe, perform process analysis on the parts and determine the order of processing, so as to reduce the tool replacement time during the processing and ensure processing accuracy.

6. Machine tool maintenance and upkeep: Regular maintenance and upkeep of CNC machine tools, including cleaning, lubrication and inspection, can ensure the normal operation of the machine tool and extend its service life, thereby maintaining its processing accuracy.

To sum up, improving the machining accuracy of CNC vertical lathes requires starting from many aspects, including machine tool basics, CNC programming, system error compensation, tool and fixture selection, process analysis, and machine tool maintenance and upkeep. By comprehensively considering and optimizing these factors, the machining accuracy of CNC vertical lathes can be effectively improved.