mijobooks Chapter 21 The Teacher's Appreciation
Chapter 21 The Teacher's Appreciation
Professor Zheng nodded in satisfaction and closed the roster: "Alright, sit down."
Then he picked up the chalk and began the formal lesson.
Liu Changsheng, standing next to him, looked on with admiration. "Brother Chen's skill level is really high. No wonder he can come up with new coated knives."
Professor Zheng started with the mechanical analysis of cutting forces, then moved on to the work done in cutting deformation, and finally to the formula for the conduction of cutting heat, writing each step on the blackboard one by one.
Chen Weiguo listened intently.
What Professor Zheng said all corresponded to the content in the system's database, and the version provided by the system was more straightforward and easier to understand.
Liu Changsheng, standing next to him, was a bit lost, scratching his head as he looked at the blackboard full of formulas: "Brother Chen, what was that variable he was talking about again?"
"The cutting ratio is the ratio of the cutting thickness to the chip layer thickness."
"Oh... so what's the purpose of that formula at the end?"
Chen Weiguo explained in a low voice: "That formula uses the cutting ratio to deduce the shear angle. You see, the core is that as the tool rake angle increases, the shear angle increases, and the cutting force decreases. The reverse is also true. That's why a negative rake angle is used when machining hard materials... In order to increase the edge strength, the cost is that the cutting force will increase."
Liu Changsheng was stunned: "Brother Chen, you've studied this before?"
Chen Weiguo smiled and said, "I've read a little bit myself."
While others start learning theory from scratch, the system gave him a huge first-mover advantage, allowing him to learn at a speed more than ten times faster than others.
The bell rang, signaling the end of get out of class.
Professor Zheng picked up his lecture notes: "Today's homework is exercises three to six. Also, I'll be asking a question in the next class... what are the three sources of cutting heat, and how can we control each one through machining parameters? I hope you'll preview the material beforehand."
After saying that, he looked at Chen Weiguo and said, "Comrade Chen Weiguo, please stay behind."
Suddenly, dozens of people turned their attention to Chen Weiguo.
Liu Changsheng, standing to the side, was a little worried... Had he answered too many questions and offended the professor?
Chen Weiguo had some doubts, but then he thought that he hadn't done anything wrong, so he stayed.
Once the classroom was empty, Professor Zheng walked over and remarked with emotion, "I've heard Zhou Wenyuan mention you before. He showed me the materials for your wave-shaped blade design. You're the first person I've ever met who received such high praise from him. I've been curious about what kind of person could design a wave-shaped blade since before the semester started. Now that I've met you, you're certainly quite interesting."
He paused, then said seriously, "Your current level is above average among your classmates. You've already mastered most of the knowledge points covered in class. But there are still two issues… your knowledge system isn't systematic, and your theoretical depth is insufficient. I suggest that while completing your regular coursework, you expand your reading through elective courses and evening study sessions. If you have any questions, feel free to come to my office anytime."
"Thank you, Professor. I will definitely study hard."
Chen Weiguo felt a warm glow inside.
This Professor Zheng truly values himself.
Since that's the case, we can't let them down.
I must perform well at school, make myself proud, and bring honor to Yanjing Machinery Factory.
……
On Tuesday, a notice about the practical training course was posted on the bulletin board in the teaching building corridor.
A group of students surrounded him.
Chen Weiguo glanced at it: Starting this Wednesday, all students in the advanced training program will enter the school-run factory workshop for practical teaching, which will last for four weeks.
Lecturer He Jiaxiang was formerly an eighth-grade fitter at Shenyang No. 1 Machine Tool Factory.
They even invited an eighth-level fitter to be an intern lecturer... The school is really willing to invest in this training course.
You should know that a level 8 fitter is no ordinary worker; they are all treasures of the factory.
It's really not easy for the school to transfer people here and for the factory to release people.
Early Wednesday morning, all 46 students in the class gathered at the gate of the school-run factory.
The factory isn't large, but it's fully equipped.
Lathes, milling machines, planers, and grinders were arranged in two rows, all of them the latest domestic models, and were kept in excellent condition.
A man in his fifties walked over: "Is everyone here? My name is He Jiaxiang, you can call me Master He from now on. Let's talk about the assessment first... For this internship course, you'll have to submit a final project. Each of you will independently complete a set of high-precision mating parts, a fit between a shaft and a hole. You can choose between clearance fit or interference fit. The precision requirement is a minimum of N7, with no upper limit."
The crowd erupted as soon as he finished speaking.
"Minimum N7 complete set of components? Isn't that a test for an eighth-level skilled worker?!"
"I work with milling machines, and I'm fairly confident in my N7 precision. But you want me to do everything myself—turning, milling, grinding—and coordinate with others? How am I supposed to manage that?"
The burly man from Northeast China standing in the front row shook his head: "I've worked in Liaoning for sixteen years, and I wouldn't dare say I can do this job on the first try. Master He is really testing us to death."
Chen Weiguo remained silent.
He had worked in the military industry before, so the N7 precision fitting parts were nothing new to him.
But the problem is, this place is different from the factory.
At the factory, he was only in charge of the fitter's job.
Here, you have to start from scratch, doing everything yourself – turning, milling, planing, and grinding – all by yourself from beginning to end.
The test assesses comprehensive abilities, not just a single skill.
It's still quite challenging.
However, for someone with a system like him, this level of difficulty is negligible.
Chen Weiguo secretly brought up the system, and a blue light screen unfolded before his eyes.
The process route is automatically generated... What tool to use, how to clamp and position it, how much allowance to leave for rough turning, how much feed rate to leave for finish turning, what speed to use for drilling, what parameters to use for reaming, how much allowance to leave for grinding—every step is clearly defined.
The system even provided a complete video of the processing steps.
He just needs to follow the steps.
Chen Weiguo picked up the unfinished piece, marveling at how powerful the system was.
They even gave him a solution he had never thought of before... First, rough turn the outer circle, then drill and ream the hole, and then reverse the process to use the hole as a positioning point to finish turn the outer circle.
This solves the concentricity problem.
Liu Changsheng approached him unnoticed: "Brother Chen, are you confident?"
He held a piece of rough material in his hand, looking troubled: "I'm a level four fitter, N7... You want me to make N7? Isn't that asking me to die? Even the experienced craftsmen in our factory have to grind N7 several times over."
Zhou Guoqiang, standing beside him, frowned and said, "It's not that we can't make the N7, but that's a single part. For mating parts, the shaft and the hole need to match, which is not easy."
Several experienced workers surrounded He Jiaxiang, asking if they could complete the task in groups, but He Jiaxiang retorted with a single sentence.
Chen Weiguo patted Liu Changsheng on the shoulder: "Don't rush, get the blank first. When you're drying, pay attention to the order of clamping, don't rush into finishing, leave a few extra allowances, that way you'll have a better chance of success."
Liu Changsheng nodded, seemingly understanding, "Brother Chen, have you done this kind of work in a factory before?"
"I've done similar things before."
"No wonder you're not flustered at all. I wish I were as calm as you."
Zhou Guoqiang also asked, "Xiao Chen, do you have a plan?"
Chen Weiguo nodded.
Zhou Guoqiang looked at him with some surprise... He had only just begun to get an idea, and this young man already had a plan.