Maintaining stable dimensional accuracy of aluminum alloy parts processed by CNC lathes involves multiple factors. Here are some key factors:

1. Tool selection: CNC lathe selects the appropriate tool type, tool material and tool geometry. Especially for materials such as aluminum alloys, suitable tools can reduce cutting heat and tool wear, helping to maintain dimensional accuracy.

2. Cutting parameters: CNC lathes optimize cutting parameters such as cutting speed, feed speed and cutting depth. Reasonable cutting parameters help improve processing efficiency while maintaining part size stability.

3. Cooling and lubrication: CNC lathes use appropriate coolant and lubricating oil to lower the cutting temperature, reduce the deformation of aluminum alloy, and protect the cutting tools. Effective cooling also improves surface quality.

4. Machine tool stability: Ensure the stability and rigidity of CNC lathes. Stable machine tool structure helps reduce vibration and improve machining accuracy.

5. Process planning: CNC lathes should reasonably plan the processing procedures to avoid unnecessary re-clamping and re-positioning. Reduce the deformation and error accumulation of parts during processing.

6. Tool path optimization: CNC lathes optimize CNC programming to make the tool path smooth and reasonable and avoid sharp tool entry and exit trajectories. This helps reduce machine tool vibration and improve machining accuracy.

7. Heat treatment control: If the CNC lathe needs to be heat treated, ensure the control of the heat treatment process to avoid dimensional changes and shape deformation.

8. Regular replacement of tools: CNC lathes regularly check and replace tools to ensure that tool wear does not have a negative impact on machining accuracy.

9. Part fixation: CNC lathes use appropriate fixtures and fixation methods to ensure the stability of the workpiece during processing. Unstable workpiece clamping can easily lead to dimensional errors.

10. Quality control: CNC lathes have established a strict quality control system, including using high-precision measuring tools for regular testing, and recording and analyzing data during the machining process.

By comprehensively considering these factors, the dimensional accuracy of aluminum alloy parts processed by CNC lathes can be effectively maintained stable. Paying close attention to all aspects of the processing process and making timely adjustments and improvements will help improve the stability and consistency of processing.