Assembling and machining method for large orthogonally-staggered herringbone tooth assembly

The invention relates to the technical field of herringbone tooth assembly methods, and discloses an assembly machining method of a large orthogonally-staggered herringbone tooth assembly, the orthogonally-staggered herringbone tooth assembly comprises a center shaft, a left-handed helical tooth outer gear ring and a right-handed helical tooth outer gear ring, two shaft hub sections are arranged on the center shaft, and at least one side of each shaft hub section is provided with a step end face. Detecting and grinding to ensure that the addendum circle diameters and the tooth widths of the two outer gear rings are consistent; s2, roughly grinding the teeth to ensure that the common normal lines of the two outer gear rings are consistent; s3, the two outer gear rings are placed on the horizontal plane, the end faces are flush, and the two outer gear rings are in a backlash-free meshing state; s4, marking assembly lines on the end faces of the two outer gear rings at the positions which are higher than the hor