The processing sequence of CNC lathes depends on the specific requirements and characteristics of the workpiece being processed, and usually includes the following steps:

1. Design processing technology: According to the drawings and processing requirements of the CNC lathe workpiece, design the processing route, determine the cutting sequence, tool selection, processing parameters, etc.

2. Preparation: Clean the CNC lathe and related equipment, check the tools, fixtures and workpieces, and ensure that the preparation is complete.

3. Install the workpiece: The CNC lathe clamps the workpiece on the CNC lathe according to the process route and fixture selection to ensure that the workpiece is firmly clamped and correctly positioned.

4. Set process parameters: The CNC lathe sets the processing parameters of the CNC lathe according to the processing route, including cutting speed, feed speed, cutting depth, etc.

5. Debug the program: The CNC lathe imports or writes the processing program, debugs and verifies the program, and ensures that the program runs correctly.

6. Start the machine and run: Start the CNC lathe, run the processing program, perform trial cutting and processing adjustments, and ensure that the processing process is normal.

7. Rough machining: According to the CNC lathe process route, the workpiece is rough-machined, and the workpiece is cut with a rough machining tool to remove excess material.

8. Semi-finishing: Semi-finishing of the workpiece is performed, and the workpiece is cut with a semi-finishing tool, gradually approaching the final size and shape.

9. Finishing: Finishing of the workpiece is performed, and the CNC lathe uses a finishing tool to accurately cut the workpiece to achieve the final size and surface roughness requirements.

10. Inspection and finishing: The CNC lathe inspects the finished workpiece, including dimension measurement, surface quality inspection, etc. If there are any unqualified parts, they are trimmed or reprocessed.

11. Finishing: The CNC lathe completes all processing procedures, cleans and protects the workpiece to ensure that the workpiece quality meets the requirements.

In general, the processing sequence of the CNC lathe is from rough machining to finishing. Through step-by-step cutting and machining, the workpiece is processed to the final size and shape, and inspection and adjustment are performed during the processing to ensure the processing quality and accuracy.