thank you for care this question, but the actual situation is the swept model, this situation is the cylinder turning process, I want to simulation the process of material was removed, and then view the details of the machined surface
Have you looked at the "swept volume" command? It might give a more accurate result for your machining operation. However, if the helix pitch is smaller than the diameter of the cutting tool, you'll probably still run into modeling issues.
From your picture, it looks like you have decreased the pitch; that is the opposite to what you need to do. Make the pitch larger and/or make the section narrower so that the resulting swept body doesn't intersect itself.
The swept volume command needs a solid created from a revolved profile, not necessarily a cylinder. If you are making a threaded type cylinder as shown on the help page, it will result in a more accurate representation of the actual machined part.