Wang Yanshen: A young doctor who is addicted to the world of precision

A young doctor who is obsessed with the world of precision

——Wang Yanshen, associate professor of the School of Communication of Harbin Institute of Technology (Weihai).

◎ Text/Reporter Xia Shugang Correspondent Wang Xiao Photo/Reporter Yang Zheng

Calm and elegant, low-key and taciturn. The first time he met Wang Yanshen, this was the first impression he left on the reporter.

At school, many teachers and students do not know the young doctor, and they rarely see him on campus. But there's one place where you have a 90% chance of finding him, and that's the lab.

The laboratory is where Wang Yanshen stays most often, and thinking and practicing is his favorite activity.

Wang Yanshen is operating an optical instrument.

Make boring classrooms

Become fun

Interesting cases, novel hands-on operations, a science and engineering class, interrupted several times by applause. The speaker of this class is Wang Yanshen, associate professor of the School of Naval Architecture and Ocean Engineering.

In 2008, Wang Yanshen graduated from the Institute of Precision Engineering of Harbin Institute of Technology and came to Weihai Campus to teach. Like other new teachers, when Wang Yanshen first stepped onto the podium, he was nervous and confused, and he had almost no teaching skills to speak of. But in order to stand on the three-foot podium as soon as possible, he deduced his own "teaching improvement record".

"Also in college, the biggest difference between being a teacher and being a student is that the sense of responsibility is greater." In his view, as a teacher, you must not only have solid professional theoretical knowledge and teaching methods and skills, but also have a full sense of responsibility.

"Before walking up to the podium, I watched a large number of online open classes in advance, found lesson plans and PPT courseware to learn, and also observed the lecture process of some old teachers." While learning from the reference, Wang Yanshen set out to produce courseware that conformed to his own reality. In order to achieve the best teaching results, he often worked until twelve o'clock in the evening. Gradually, his teaching became familiar and became a popular teacher in the eyes of students.

Wang Yanshen believes that in order for students to learn more advanced and practical knowledge, they must add new things to the classroom and introduce practical operations. He often inserts some of the latest illustrations in class and plays videos of experimental operations for his classmates to see. At the same time, it absorbs the advanced engineering education concepts of foreign countries and introduces the current mainstream mechanical design and simulation software and design methods into the classroom.

"After adhering to it for a period of time, the content of the class has been enriched, and the enthusiasm of students has been mobilized through on-site demonstrations and other methods in the classroom, and everyone has listened carefully and learned seriously, and the classroom effect has naturally become better." When it comes to teaching experience, Wang Yanshen is full of confidence.

18 hours a day

Soak in the lab

During his doctoral studies, under the leadership of Professor Dong Shen, a well-known ultra-precision machining expert, Wang Yanshen has successively participated in forward-looking research on topics urgently needed by national defense such as vibration suppression of precision micro-milling machines and the nanomechanical characteristics of the dense area inside ultra-short pulse laser-induced transparent materials, and has achieved a large number of research results with international advanced level.

How did so many achievements come about? Wang Yanshen's answer is only one: bubble laboratory.

During his doctoral studies, Wang Yanshen spent most of his time in the laboratory, reaching 18 hours a day at most. Now that he has been working in weihai campus for nearly 8 years, Wang Yanshen is still a scientific research expert in the eyes of colleagues and students, often soaking in the laboratory and doing research with students.

In addition to his daily teaching work, Wang Yanshen is also in charge of the training of graduate and undergraduate students in the HIT New Beiyang National-Local Joint Engineering Laboratory. Many undergraduates who have come out of here have been escorted to Tsinghua University and other well-known universities for further study, and many have become the backbone of well-known domestic machinery manufacturing, automobile manufacturing and other enterprises. Most of the graduate students work in national defense, military industry and other scientific research institutes.

Behind the results comes from the strong academic atmosphere of the Joint Laboratory, where every student can challenge the authority and make bold breakthroughs. Among them, Wang Yanshen led the graduate student Zhang Meimei to do research on the friction characteristics of the rubber roller of the special printer, proposed a new tribological theoretical model to explain the nonlinear friction problem in the printer pass paper, filled the gap in the research field of domestic special printers, and provided a theoretical basis for the development of subsequent rubber rollers and the research and development of special printers.

"Scientific research must not be done behind closed doors, and communication is the best teacher, because communication and discussion can make everyone speak freely, get information and inspiration." Wang Yanshen teaches students to use a variety of commonly used scientific research software, teaches them how to efficiently consult scientific and technological literature, and grasp the frontiers and hot issues in the field of research in a timely manner. Encourage students to attend more scientific research forums and try to get guidance from experts and experienced people from various scientific research forums. "While learning from the old, we must innovate, not copy, through their own down-to-earth research, to experience the true meaning of the scientific research process and methods, from which to experience the summary and refinement of their own unique research programs."

The production error is 0.2 microns

Micro milling machines

Laser assist, three-axis precision motion control, air flotation vibration isolation... In a corner of the joint laboratory, a laser heat-assisted micro-milling machine is displayed. Don't look at its small size, but it is a "star product" in the field of precision machining, with international advanced and domestic leading level, pouring Wang Yanshen's nearly 10 years of painstaking efforts.

Titanium alloy, nickel alloy materials have high strength, high hardness and high heat resistance and other excellent characteristics, is widely used in aviation, aerospace and medical and other fields, but the above materials due to extremely high hardness and difficult to process, the use of laser to soften the metal surface, reduce the hardness of the material is a good way to solve the difficult to process materials. At present, domestic research in the field of laser thermal-assisted micro-milling is rarely reported and mostly in the simulation stage of research, while the research in this field in developed countries in Europe and the United States is only 10 years of accumulation, and some basic theories and process problems have not yet been fully understood.

During his doctoral studies, in the process of participating in the development of the first ultra-precision micro-milling machine in China, Wang Yanshen paid attention to the development of the field of laser thermal-assisted micro-milling, always paid attention to the latest developments in the field of foreign countries, often read relevant magazines and literature, and gradually came up with the idea of manufacturing such machine tools.

In March 2013, Wang Yanshen led two graduate students to start the development of laser thermal-assisted micro-milling machine tools. After more than half a year of efforts, the first generation of laser thermal-assisted micro-milling machine tool prototype was built, and after more than 200 tests, the processing accuracy was improved to 0.3 microns, and a large number of first-hand experimental data were obtained, and the processing quality was improved by more than 40%, which was recognized by relevant experts in the industry.

By summarizing the advantages and disadvantages of the first-generation prototype, Wang Yanshen found that there are still certain problems in its suppression of external low-frequency vibrations. Subsequently, 3 graduate students and 1 undergraduate student were led to redesign the structure of the machine tool. After eight months of hard work, the second generation of laser thermal-assisted micro-milling machine tool prototype was built in Weihai Campus in June 2014. A large number of experimental data show that the prototype has better vibration suppression performance than the first generation of prototypes, and its processing accuracy can reach 0.2 microns.

At present, Wang Yanshen is still engaged in the research of this project, and he is ready to lead graduate students and full-time researchers to gradually promote the research results in this field from micro-machining to macro-scale processing, from application to national defense and military fields to motorcycle engine block processing, mold processing and other civilian applications. "Scientific research lies in the new, to do to do the most cutting-edge, can not always follow the back of people's butts." 」 It seems that the young doctor will turn on the "madman mode" again.