This document stipulates the basic requirements, product structure and basic parameters, technical requirements, test methods, inspection rules, markings, random documents and spare parts, packaging, transportation, storage and quality commitment of the automatic CNC double direct drive horizontal gear hobbing machine. This document is applicable to CNC double direct-drive horizontal gear hobbing machines (hereinafter referred to as "machine tools") with a maximum processing module of 3 mm and a maximum workpiece diameter of 120 mm, which adopts a truss-type automatic loading and unloading mechanism.