What type of chip is characterized by being segmented in metal cutting?

The type of chip that is characterized by being segmented in the process of metal cutting is the discontinuous chip. Discontinuous chips are formed when the cutting conditions lead to fractures in the material being machined, often due to factors like the material's brittleness or the cutting parameters being too aggressive. These chips can appear as segmented or fragmented pieces, which indicates that the material has not been removed in a continuous flow but rather in discrete segments or pieces. This behavior is particularly common in machining processes involving hard materials or when there is a substantial change in cutting conditions, such as high cutting speeds or specific tool geometries.

In contrast, continuous chips are formed when the material is machined smoothly, resulting in long, continuous curls that indicate a ductile material behavior under steady cutting conditions. Serrated chips arise from specific materials or conditions that cause them to develop saw-tooth-like edges, reflecting a form of periodic fracturing. Built-up edge chips are associated with some forms of tool wear, where material from the workpiece adheres to the cutting tool, creating a layer that can lead to variable chip formation. Each of these chip types results from different machining dynamics, making the characterization of the discontinuous chip distinct and significant in understanding machining processes.