Question

pbf: post - processing
use the information below to answer the question.
heat treating
one post - processing step for powder bed fusion (pbf) prints is to use heat treating. heating the metal of the print and then quickly cooling it down removes any internal stresses within the metal. this reduces the chance of it affecting the performance of the piece.
support material
another step of post - processing for powder bed fusion (pbf) prints involves the support material. the support material has to be removed by the operator using a grinder once the print is complete. after the support material is removed, traditional machine tooling techniques can be used such as welding, grinding, or polishing. a subtractive manufacturing process can be done as well, whereby a cnc machine removes material. machining, electroplating, or micro - polishing can be done during post - processing as well.
what process for powder bed fusion (pbf) prints involves a cnc machine removing material?
a positive electroplating process
a high temperature curing process
a pressure diffusion process
an additive manufacturing process

Explanation:

The text mentions that a subtractive manufacturing process for Powder Bed Fusion (PBF) prints involves a CNC machine removing material. This is consistent with the concept of a subtractive manufacturing process where material is taken away from a workpiece.

Answer:

a subtractive manufacturing process