Great Power Industry: You're a private company building an aircraft carrier?

"How could that be? These parts were all made by our most experienced master craftsmen, and they even used gear steel produced by the Capital Steel Plant!"

“This type of steel is also used in Shaanxi Gear’s gearboxes, and their feedback has been quite positive,” Yuan Limin said immediately.

The parts in front of us were all made on a gear hobbing machine and had not yet been finely ground on a grinding machine. The surface had cut marks, was smooth and full of texture, and was obviously made of the best gear steel. Qin Chuan actually said that these parts were not up to standard.

"Gear steel is also divided into many types."

Qin Chuan began, "The gears inside the gearbox often rotate at thousands of revolutions per minute, requiring high-carbon steel or alloy steel. This allows the gears to have hardened tooth surfaces, possessing high hardness and wear resistance, suitable for heavy-load and high-speed applications, but..."

Qin Chuan looked at the experienced craftsmen present and said, "This kind of gear is too hard, so it is too tough and cannot achieve good impact resistance. It is not suitable for manufacturing parts such as worm gears for steering gears."

"The reason your steering gear is breaking isn't just because of inadequate heat treatment, but also because you used the wrong type of steel!"

In later generations, a certain Quan's kitchen knife was criticized by many netizens because it could not be used to chop garlic.

Everyone thought that using a kitchen knife to smash garlic was perfectly normal, so the fact that it broke while doing so meant that the knife was of very poor quality!

In reality, this shows a complete lack of understanding of materials science.

To make a kitchen knife sharp and long-lasting without needing to be sharpened, you need to use a particularly hard steel, such as high-carbon steel.

The harder the steel, the more brittle it is; this is a classic case of not being able to have your cake and eat it too.

Gearbox gears need to rotate at high speeds and withstand large torques, so they must have sufficient rigidity and therefore require hardened gears.

As for getting teeth?

Experienced mechanics don't even need to use the clutch during gear shifts; the gear engagement is smooth, and there's absolutely no risk of gear grinding due to mismatched gear speeds.

The steel used in the steering gear does need to be hard enough, but at the same time, it also needs to be flexible enough. For example, if the front wheel hits a rock, there will be a reverse torque acting on the steering wheel, which will impact the steering gear. If it is not flexible enough, it is easy to break the gear!

"You mean, we should use low-carbon steel to make these parts?" Yuan Limin asked. "But low-carbon steel isn't hard enough!"

Low-carbon steel has sufficient toughness, but insufficient strength. If used in a load of 100 tons or more, it might turn into a twisted mess if you just turn the gears on the spot!

"Not hard enough? That's because it hasn't undergone proper heat treatment."

Qin Chuan said, "After my treatment, the Rockwell hardness of the low-carbon steel surface can also reach 60!"

"Okay, let's try making a set using low-carbon steel!"

Zhou Guodong nodded: "Old Zhao, Old Luo, you two go to the workshop and catch up on some work!"

"Okay." The two nodded.

Pan Yunfei, standing to the side, rolled his eyes and said, "Qin Chuan, you're amazing! You could tell the materials were substandard just by looking at them. Can you teach me?"

"Of course." Qin Chuan nodded.

Everyone else pricked up their ears, waiting to hear, but Qin Chuan remained silent, holding the water cup he had brought made from a canned food jar, and began to gulp down water.

"Qin Chuan, can you speak now?"

"Yes, call me master first."

Master? How old are you? You haven't even grown your hair yet, and you expect me to call you master?

Pan Yunfei immediately felt a fire rising in his heart.

"Forget about the three kowtows and the tea-serving etiquette, just call me 'Master'."

"When did I say I wanted to become your disciple?"

"You just so earnestly asked me to teach you, how can I teach you without asking to become your apprentice? Do you want to get it for free?"

"you!"

Pan Yunfei wasn't genuinely interested in Qin Chuan teaching him; he just wanted to expose Qin Chuan's secrets.

In his opinion, Qin Chuan was just making a fuss, it was just a lucky guess. What experienced craftsman could tell that the steel was substandard just by looking at it?

joke!

"Xiao Chuan, you are a capable person. The more I think about what you just said, the more reasonable it seems to me."

Zhou Guodong said, "Among three people walking together, there must be one who can teach me. The ancients were right. Xiao Chuan, tell me about it, and I'll be willing to become your student."

"No, Director Zhou, I dare not take you as my apprentice. If you want to know, I will just tell you briefly."

"The reason is actually very simple. High carbon steel or alloy steel is particularly hard, so the machine has to move slower during processing, resulting in more refined gears. Low carbon steel is less hard, so the machine can move faster, resulting in a rougher gear surface."

"Especially the connection between the two cuts, it's very easy to see."

Everyone thought it was about looking at the color and texture, but it turns out it's about looking at the processing!

“Our factory is full of experienced workers. They should be able to make the surface very smooth even if they use low-carbon steel. But these parts must have been made in an emergency. If they were made of low-carbon steel, the difference would be very obvious.”

"When Master Zhao and Master Luo bring over the processed parts, everyone will see for themselves."

Half an hour later, Zhao Shuren and Luo Minggang delivered the parts, and sure enough, clear machining marks could be seen.

"Knowing that everyone was in a hurry, we drove the vehicles faster and increased the number of vehicles entering the road, so the surface should be a bit uneven."

"However, after the heat treatment, we still need to use a grinding machine. After fine grinding, it should be fine."

Zhao Shuren put down the parts as he spoke.

Wait a minute, something's not right. Why are they all looking at me like that? What's going on?

“In our line of work, you have to be meticulous. Engineer Qin is really something!” Zhou Guodong said.

"so so."

Qin Chuan smiled and looked at Pan Yunfei: "Director Pan, do you understand now? These are all trivial tricks."

"However, it will be beneficial for you to master this skill. You should learn more about it in the future. As long as you have a good attitude, I can teach you more. If you don't want to call me master, then don't. I don't care about that."

"I know you're shy, you want to say it but you're too embarrassed to say it..."

Pan Yunfei's face flushed red and then turned pale. He clenched his fists and then slowly opened them.

He graduated and joined the Yellow River Factory, immediately becoming a cadre. He has worked his way up to where he is now, and no one has ever humiliated him like this before!

How did I offend Qin Chuan? I only asked a few questions!

He's so young, what's wrong with me, as his elder, asking him some questions?

He wouldn't know that Qin Chuan also had his own principles. Normally, he would be respectful to his elders, but he would never hesitate to confront those who relied on their age or those who were obsessed with foreign things.

Anyway, he came to be a technical consultant, he's already been paid, he came to provide on-site service, and he'll leave once he's done.

Looking at Pan Yunfei's mad dog-like appearance, would he dare to come up and bite me?

"Okay, now that the parts are machined, let's proceed with carburizing."

"There are many intricacies to this carburizing process. I will explain the key points to you. The master can only lead you to the door; the rest is up to you. How much you can understand depends on your own destiny."

"Director Pan, you too, don't just stand there, come over and listen, I won't repeat myself!"