Methods to prevent deformation of CNC vertical lathes include:

1. Choose high-quality materials: Choose high-quality CNC vertical lathe materials, such as high-quality cast iron or steel, to ensure the machine tool structure is stable and has strong resistance to deformation.

2. Reasonable design of structure: CNC vertical lathes ensure uniform stress and good rigidity of each component of the machine tool through reasonable design of machine tool structure and reinforcements, thereby reducing the occurrence of deformation.

3. Optimize the processing technology: During the processing of CNC vertical lathes, appropriate cutting parameters, coolant and tools are used to control the processing temperature and cutting force to reduce the impact of thermal deformation.

4. Regular maintenance: Perform regular maintenance on the CNC vertical lathe, including cleaning the machine tool surface, lubricating the sliding surface, checking whether the transmission system and guide rail system are normal, etc., to ensure the stable operation of the CNC vertical lathe.

5. Control the ambient temperature and humidity: Maintain stable temperature and humidity in the CNC vertical lathe's working environment to avoid changes in temperature and humidity affecting the structure of the machine tool.

6. Strengthen rigid support: Add supports or reinforcements at necessary locations to improve the overall rigidity and stability of the CNC vertical lathe and reduce the occurrence of deformation.

7. Pay attention to the operating specifications: CNC vertical lathe operators should use the CNC vertical lathe correctly in accordance with the operating procedures to avoid damage to the machine tool structure caused by overload, collision or improper operation.

In summary, through material selection, design, processing technology optimization, maintenance, environmental control, strengthening support and standardized operations, we can effectively prevent the deformation of CNC vertical lathes and ensure their long-term stable operation and processing accuracy.