Daming: If I find a great-grandson, I will teach an emperor through the ages

Chapter 55

"Mother."

Zhu Yunwen looked at Lu Shi who was like a yaksha Rakshasa in front of him, and he was terrified. He had never seen his mother so terrifying before!
Lu took a deep breath and closed his eyes for a long time.

After a while, she opened her eyes again.

"Wen'er, you don't need to pay too much attention to this matter, just do what I told you to do."

"The monk next to King Yan is not clear about his intentions. Wait for my mother to contact my family to find out, as well as the person in his mouth. Let people find out if it is true or not."

"Yes, mother, I remember." Zhu Yunqi nodded obediently.

Mrs. Lu nodded in satisfaction, and then shouted out again, but this time his voice returned to the usual quiet and melodious.

"Huan'er, please bring the dinner."

……

For a period of time after that, Cao Wei lived a life of two points and one line between the Ministry of Industry and his family every day.

Although such days are boring, they are also much more fulfilling, unlike before, when they were either wandering or fishing.

After ten days of this...

[Countdown to return: 310 days, 15 hours, 48 minutes and 16 seconds]

After trial and error, the matching screws and nuts were finally successfully produced.

And the fourth set of steam engines was freshly released after various data calculations and measurements, and corrections made little by little.

From the outside, it looks like the steam engine built twice before.

It's just that in the closed part of the steam engine, there are many small holes on the two wing-like plywood, which are reserved for screws and nuts.

According to the common sense in the past, Cao Wei designed the shape of the nut and the nut according to the hexagonal shape. Naturally, when they were manufactured together, there was a hexagonal wrench.

at this time,

Cao Wei and Yan Zhen stood at attention in the craftsman's workshop, watching the craftsmen completing the final assembly work of the steam engine in full swing.

After the boiler, steam engine, and gear set were all ready, Song Ping raised his sleeve and wiped the sweat on his forehead, put down the hex wrench in his hand, and walked over.

"Shang Shu Yan, Master Cao, you are ready." Song Ping seemed to have a smile on his face at all times, with a hint of flattery.

Cao Wei didn't say a word, Yan Zhenzhi is the most official here.

"Move the boiler and steam engine to the yard together, and start a fire test." Yan Zhen gave orders to the craftsmen.

Then, with the joint efforts of the craftsmen, the steam engine was completely moved to the open space in the front yard of the workshop.

Before Yan Zhenzhi gave the order again, the craftsmen had already started a fire under the boiler with great insight.

Next, just wait...

As time passed, the fire grew stronger and stronger, and a muffled sound of rustling came from the boiler.

Cao Wei heard Yan Zhen swallowed very clearly beside him.

Cao Wei was not as nervous as Yan Zhenzhi, he was just thinking about whether there would be any problems like this with the steam engine built for the fourth time.

This is the second steam engine built since Cao Wei came to the Ministry of Industry to cooperate and help.

The first one was the same as before. There were still problems with the piston and the inner wall, such as jamming and air leakage.

Learning from that experience, Cao Wei figured out how to make the inner wall inlaid in advance.

First, a cylinder of suitable size is made outside, and it is measured accurately and meticulously with a vernier caliper until it is determined to meet the standard. Then, the inner wall is fired with steel around the periphery of the cylinder, and then separated and embedded inside the steam engine.

Doing so can greatly reduce the problem of incompatibility between the piston and the inner wall, and now this fourth attempt, in Cao Wei's view, can be said to be foolproof...

The noise in the boiler gradually subsided, and the water was about to boil.

Sure enough, it didn't take long for the piston in the steam engine to start moving. The movement trajectory was very smooth, without any lag or air leakage.

However, Cao Wei discovered that the speed of the piston movement was too slow and the amplitude was too small!
It stands to reason that after the piston and the inner wall are fully fitted, the piston can move unimpeded. How can it be so powerless now?
Cao Wei walked forward slowly, bowed his head and observed carefully.

However, after looking around, I didn't find any problems.

This made Cao Wei's mind full of question marks.

Your energy conversion is wrong!If Newton saw this scene, he would definitely jump out of the coffin!

No, Newton was not born yet...

Shaking his head and throwing out the thoughts that jumped out of his mind, Cao Wei lowered his head again and circled around the steam engine.

Yan Zhenzhi also discovered the problem. The trajectory of the piston movement this time obviously did not freeze at all, but it was not as strong as the previous two times.

"Brother Cao..."

"Shh-"

Yan Zhenzhi just opened his mouth, but was interrupted by a boo from Cao Wei.

Cao Wei gradually turned from observing with his eyes to listening with his ears.

"Ah-"

The sound of a slight gas leak reached Cao Wei's ears.

He immediately thought of the boiler link that had leaked before, and the tail of the piston.

But after careful observation of these two places, it was discovered that the sound did not come from here.

At this time,

The pressure of the water vapor in the boiler seems to be higher, and the piston moves faster, and with it, there is the sound of gas leaking.

"Ah-"

Cao Wei tilted his head, listening carefully...

Finally, he stopped at the place where the upper and lower parts of the steam engine joined.

found it!
He waved and Yan Zhen walked forward.

"There is an air leak at the place where the screw is fastened, and the air pressure in the steam engine is not enough." Cao Wei said directly to Yan Zhen.

Hearing this, the latter stepped forward and listened carefully, and sure enough he heard the sound of gas leaking.

"What's the reason for this? Are the screws not tightened?" Yan Zhenzhi was a little depressed. The steam engine has not been successful these four times!

Cao Wei shook his head, "No."

When the craftsmen were tightening the screws of the steam engine just now, he and Yan Zhenzhi were watching from the sidelines.

None of the craftsmen were lazy, they were gnashing their teeth as if they were trying to break the screws!
The screws are definitely tight, which is absolutely fine.

The problem is the joint between the upper and lower cylinders of the steam engine.

When using mortise and tenon joints to join the upper and lower parts of the cylinder, the craftsmen almost hammered the wing edge of the steam engine into a whole, so that the seams are tight, and naturally no trace of gas will leak out.

But now, after changing to using screws, the artisans have omitted the thousands of hammers that the craftsmen used to hit the joints of the steam engine, and the degree of tightness has been greatly reduced. Screws alone cannot completely seal a tank with huge air pressure.

Cao Wei shook his head and smiled helplessly.

No wonder people always say that failure is the mother of success. Any invention will be accompanied by countless failures!

This is still a situation where Cao Wei understands what a steam engine is. He has the experience and vision of someone who has experienced it, but he still faces failures one after another.

Precise craftsmanship, correct theory, important components, screws, and rubber pads are all indispensable.

But there is no rubber in Daming now, so where can we make rubber pads?

According to Cao Wei's inaccurate impression...the rubber tree at this time is far overseas.

Cao Wei's face became strange.

Could it be...he still has to persuade Lao Zhu to open the sea again?
(End of this chapter)