Unfortunately, most CAD-software aren’t very good at exporting Quad-topology or even uniform triangles for that matter. The only way that I managed to get a Quad mesh into Blender from Solidworks was to save the part as a .SAT-file, then opening the SAT-file in MOI3D (Moment of inspiration) which is a light-weight CAD program. In MOI, you simply save the file as OBJ and customize the topology from there.
So the process is:
- Solidworks - Save as SAT
- Open SAT-file in MOI3D
- Save as OBJ with quad topology
I know it’s a late answer, but I hope it’s helpful still.