Is it difficult to graduate from an in-service doctor majoring in mechanical design?

Difficult. On-the-job majors of mechanical design are divided into documents and double certificates. It is difficult to complete the courses of engineering mechanics, mechanical drawing, mechanical design foundation, etc. within the academic system, complete the credits, complete the doctoral thesis and pass the thesis defense, and obtain the double certificate of doctoral degree and education. Mechanical design is to conceive, analyze and calculate the working principle, motion mode and energy transfer mode of machinery according to the requirements of use, and transform it into a specific description of the working process as the basis of manufacturing.