At work the next day, when Duan Yungan walked into the office building, he saw Cheng Qingyan who was carrying a kettle and was about to go to the boiler room to fetch water.

"Early. Duan Yun smiled and said hello.

"Hmm. Cheng Qingyan responded lightly, and passed by Duan Yun.

Seeing that Cheng Qingyan seemed to be a little cold to himself today, Duan Yun was somewhat surprised, but he quickly figured it out, and he couldn't help but feel a little funny in his heart.

After returning to the department, Duan Yun cleaned up first, then took out the newly drawn drawings from the drawer yesterday, together with the drawings and materials that Cheng Qingyan gave him yesterday, and strode to the office next to him.

At this time, Cheng Qingyan had already returned from fetching water, and after seeing Duan Yun knocking on the door and entering, she asked, "Is there something wrong?"

"Look at this drawing. Duan Yun said, and put the drawings in his hand on Cheng Qingyan's desk.

"You...... It's already been drawn?" Cheng Qingyan glanced at the drawings on the table and asked suspiciously.

Cheng Qingyan didn't see the new drawings drawn by Duan Yun yesterday, so she was a little surprised.

However, Qingyan was still a little disappointed in her heart, because in her opinion, there were many design difficulties in the powerful shot peening machine, which were absolutely impossible to solve in a day or two, Duan Yun drew new design drawings so quickly, most of them just wanted to be perfunctory, so this made Cheng Qingyan a little unhappy.

"See for yourself, and ask me if there's anything else wrong. Duan Yun raised his eyebrows and said.

"Thank you then. Although Cheng Qingyan was a little disappointed and thought that Duan Yun was perfunctory, she still smiled and thanked her.

"Then I'm leaving. After Duan Yun finished speaking, he turned around and left Cheng Qingyan's office.

After Duan Yun returned to the office, he took out the workbook he had brought in the morning from the drawer.

Last night, Duan Yun used the newly bought workbook to do a simple test on his sister Duan Fang, and he didn't finish the test until eleven o'clock in the evening.

Because it was too late, considering that Duan Fang still had classes tomorrow, Duan Yun didn't judge the paper and directly let her sleep.

So Duan Yun planned to take advantage of the daytime to go to work to give his sister a paper.

Duan Yun is now very free in the technical department, and no one has arranged a job for him.

Now the colleagues in the department know that they will send Cheng Qingyan to school together on the evening of 246 every week, and the relationship is very good, although Duan Yun is only a technician at present, but with his academic qualifications, he will definitely rise all the way in the future, and the technical department is just a springboard for him, so even if Corey likes to make small moves behind his back and play right and wrong in front of the leader, he will not have any opinions because Duan Yun does private things during working hours and usually arrives late and leaves early, because doing so will only bring bad luck to himself.

Comparing the answers at the back of the exercise book, Duan Yun graded the paper very quickly, and approved several exercises in less than ten minutes.

What made Duan Yun happy was that Duan Fang's homework was indeed very good, the exercises were basically all correct, and she scored 95 points in the math paper with a perfect score of 100 points.

However, in Duan Yun's opinion, the difficulty of this exercise paper is low, it is much easier than the adult high school examination paper he took before, and the real college entrance examination paper is much more difficult than the questions in the exercise book, so even if Duan Fang scored close to a full score, it does not mean that the college entrance examination can also achieve such a high score.

So next, Duan Yun plans to learn from this exercise book, increase the difficulty of the exercises, and test his sister again.

At the same time, Cheng Qingyan also began to check the drawings given to her by Duan Yun in her office.

At first glance, it felt like the newly drawn drawings were the same as hers, but after careful observation, Cheng Qingyan couldn't help but be taken aback.

It turned out that Duan Yunxin's drawings of the shot blasting machine had made several improvements to her previous design.

As the so-called layman looks at the excitement and the insider looks at the doorway, just comparing the two drawings and designs, Cheng Qingyan found that Duan Yun's design is indeed very clever, although the changes are not big, but they all directly hit the weakness of Cheng Qingyan's design.

Somewhat different from Cheng Qingyan's design ideas, Duan Yun grasped the size design of the key parts of the machine very accurately, and there were several long formulas listed below the drawings, which accurately calculated the optimal size of the impeller in the shot blasting machine and the speed of injection, in addition, the material of the impeller and the temperature process of heat treatment are also strictly explained, and the final design scheme has been greatly improved compared with Cheng Qingyan's design in terms of shot blasting efficiency and durability of the machine!

After reading this drawing, Cheng Qingyan was stunned in surprise.

Cheng Qingyan initially thought that Duan Yunguang wanted to master the working principle and related knowledge of the powerful shot peening machine, and it would take at least a few days.

The main aspects that the powerful shot blasting machine has on the quality of shot blasting are as follows: steel shot material, steel shot diameter, steel shot speed, steel shot flow, injection angle, injection distance, spraying time, coverage rate, etc. Changes in any of these parameters will affect the effectiveness of shot peening to varying degrees.

Therefore, if you want to design a shot blasting machine with mature and excellent technology, there is a high technical threshold.

But judging from the drawings he made, Duan Yun not only has mastered the design principle of the powerful shot peening machine, but also has a very high level of attainment, which is not at all a height that a novice can reach!

And Duan Yun only took one day to complete the improvement of his drawing design, so that Cheng Qingyan felt that the gap between his design level and Duan Yun at this moment was not ordinarily large, if Duan Yun was a college student, then Cheng Qingyan was like a primary school student who had not yet graduated in front of him!

Cheng Qingyan felt that she couldn't see through Duan Yun anymore, combined with the fact that Duan Yun was admitted to Yeda with the first place in the city this time, which made her feel more and more that Duan Yun was a little unfathomable......

Sitting at the desk and staring at the drawing for a few minutes, Cheng Qingyan bit her lip, stood up and walked out of the office.

"Duan Yun, come out for a moment. Cheng Qingyan came to the door of the technical department and waved hello to Duan Yun.

"What's the matter?" Duan Yun got up and walked out when he saw this.

"Have you ever been exposed to a powerful shot blasting machine before?" Cheng Qingyan asked, looking directly at Duan Yun.

"I just looked at the information you gave me yesterday. Duan Yun paused, and then said, "What's wrong?

"No, you've designed it very well. After Cheng Qingyan pondered for a moment, Liu raised her eyebrows and said to Duan Yun, "When are you going to let me take a picture of you?"

"There's class tonight, so let's get off work tomorrow afternoon!" Duan Yun said with a light in his eyes when he heard this.