What term describes the boundary line where the deformed workpiece separates from the intact workpiece during cutting?

The term that accurately describes the boundary line where the deformed workpiece separates from the intact workpiece during cutting is known as the "Chip Boundary." This boundary is significant in the metal cutting process, particularly in understanding how material is removed.

When a cutting tool engages with the workpiece, it generates a chip, which is a piece of the material that has been cut away. The chip boundary marks the transition from the deformed area caused by the cutting force to the part of the workpiece that remains intact. This boundary is crucial for analyzing the efficiency of the cutting process and understanding the forces involved, which can help in optimizing cutting parameters and tool design.

On the other hand, the other options describe different aspects of the cutting process but do not refer specifically to this boundary. For instance, "Deformation Boundary" does not accurately capture the nature of the separation process, while "Cutting Edge" refers to the part of the tool that interacts with the workpiece rather than a boundary in the material itself. Lastly, "Separation Line" is a broader term that does not specifically convey the characteristics of the boundary associated with chip formation.