Generally, three-dimensional software such as SolidWorks, ug or proe is used for three-dimensional modeling, and then seven views of two-dimensional lines are exported. Plane software such as cad, ai or cdr is used to delete excess lines and retain the main line outlines. Just add hatching. If you really don’t understand, you can search on Baidu: Changning Changqi Information Technology. They are professional in drawing various domestic and foreign patent drawings. I hope they can help you