reorganize subclasses of manufacturing process

[joergwa]

the subclass hierarchy of manufacturing process is not rigor enough:

• many subprocess relate to material as input/output and not objects or object aggregates (e.g. changing properties of material, hardening)

• I suggest to remove the subclasses and create defined classes where needed

• furthermore we need to better differentiate the classification criteria:

  1. How the process is performed (heat treatment, forming, irradiation, coating, ...)
  2. What effect or objective or output it has (hardening, softening, strengthening, stress relieving, ...)
  3. Sometimes specific industrial methods (carburizing, nitriding, quenching and tempering)

  These should not be mixed in the asserted hierarchy!