The freezing on the river has been completely lifted, so the lathes have started their work again.

Although the lathe is still at the level of the third generation, its accuracy has been greatly improved. The lathe needs to be processed by some key parts on the steam engine. This can be started now, and I don’t know how many of them need to be processed to meet practical standards.

What is the difficulty in the steam engine? It is mainly a safety issue, that is, the safety of the boiler. This boiler is simple and simple to make, because it is just a container for boiling water. It can be said that it is troublesome, and that is also troublesome. It is the problem of preventing explosions, because once the boiler is not produced properly, it is easy to explode. Besides, the steam engine is the high-pressure steam needed to drive it, so the quality of the boiler must be passed.

In order to make this boiler, Yang Heng once again picked up his old profession, which is the blacksmith.

"You all have noticed it. Look at the process of making this boiler. Remember, I am asking you to pay attention to the process, not to let you learn my speed. In any case, you can't pick up the hammer I use. Why don't you believe it?"

Yang Heng asked at a blacksmith in front of him, because there was a look of disbelief on his face.

"Yes, this hammer is just an ordinary hammer. Although it seems a little bigger than what we use, we can also use it, just because we are tired."

"Well, I appreciate your courage and doubt, but I don't like your distrust very much. Since I said that, I won't lie to you. Come on, take turns to pick it up to see if you can pick up this hammer."

After saying that, Yang Heng gently placed the hammer in front of him.

"What can't be taken for this? It's just about thirty pounds," said the blacksmith, who was looking forward to pick up the hammer easily.

"This, how is this possible? Why can't I pull it?" The blacksmith was shocked. He could only shake the hammer with the hammer handle, but he couldn't lift it up, and he couldn't even carry it at all.

"Our boss, what material is your iron hammer made of? How heavy is it?" "I'll tell you, this hammer is more than 200 kilograms. It is made of meteorites outside the sky. The density of this meteorite is more than ten times larger than the stainless steel we have here. Forget it, I'll tell you. You won't understand it too much. You understand it now, just look at it."

The hammer in Yang Heng's hand fell down again and again like a heavy press, crushing the impurities in the steel under his hand. Slowly, pieces of steel plates formed in his hands.

Moreover, Yang Heng made pieces of iron plates and rolled them up so that they could be placed in the furnace and burned. There were several furnaces on the white edges, which was also impossible. If the steel plates were poured to meet the standards, this would not be done using this method.

"You guys, come here, each of them has a pair of tongs and clamp the steel plate. Remember, your goal is to keep it flat and then move with my hands."

Following Yang Heng's instructions, several blacksmiths clamped the steel plate in Yang Heng's hand. After a while, Yang Heng clamped out a piece of the steel plate in the furnace, then unfolded it, and attached it to the front steel plate. Finally, an oversized steel plate was successfully made.

"You all understand. Yes, this is the method of joining an extra-large steel plate, but this is also difficult. Even after you learn it, this method may be of no use. But don't worry, it is still impossible to eliminate it for a long time. At least this technology is necessary for seams."

Indeed, when Yang Heng had not yet studied electric welding, this joint method must be used, and even for a long time. Electric welding, the principle is very simple, but electricity is used to melt the welding rod, and then some of the welds that need to be welded, so that a weld will be welded very safely. However, as an welding rod, it is still very troublesome to make. It needs to consider the material of the steel product, what kind of material is needed. This is a relatively difficult topic, and there is also welding medicine, which is also a topic. It also needs to be studied by the blacksmith in the mountains and the Taoist priest.

A few days later, Yang Heng used riveting to make a boiler, and the riveting joints were sealed with glue, which were also specially made of burn-resistant and high-temperature resistant glue. At this time, Yang Heng was quite relieved about the boiler he made, but even so, he could not use it directly, and he still needed to conduct tests and tests. How to do it? First, he needed to build a very thick stone house, and then put the boiler inside, so that people could add coal through a small hole.

Is there any measure on the boiler? There is a small pipe, and an iron ball is blocked on the pipe. Generally speaking, after the boiler can have more than five atmospheric pressures, the iron ball can be flushed open.

In fact, Yang Heng didn’t know how much air pressure the boiler needed, but five air pressures should be enough. If this test is successful, then a pressure gauge will be made next.

If this test is not successful, the boiler will explode, and even in future tests.

"Gudong Gudong," Yang Heng could hear his heartbeat. If the experiment was not successful, he would not know how to improve it. He watched a worker in front of him carefully pushing coal in it with iron plates. Whenever he pushed some coal, he quickly hid in a bunker underground, which was a solid stone house. Yang Heng was not relieved, so he designed a bunker underground in front of the house to make the people who added coal safer.

"Chi..." Finally, a stream of steam rushed upwards. Judging from the result, it should have been successful. However, at this time, Yang Heng was still not relieved and did not let the person in front of him come out. Instead, he let the steam come out after it was sprayed.

Is this done? No, Yang Heng still needs to continue to increase the weight of the iron ball. His goal is to reach seven air pressures, at least to reach the lowest pressure of the air press he saw in his previous life. Naturally, this air pressure is the pressure that only a large air compressor has.

After two more times of the same worry, Yang Heng finally put his heart on his lift. In this way, as an important part of the steam engine, it was successful, and the next one was other parts. The task of the blacksmiths in front was to build boilers many times and conduct tests many times. Of course, Yang Heng didn't believe that they could meet the standards in one go and explode, so it would still take several times, otherwise, this thing would be too simple.

The boiler has been developed successfully, but it will be on the machine next. But it won’t work. Next, what needs to be done is the pressure gauge and the pressure gauge. The main things to pay attention to are the sealing problem, the spring quality problem, and the other is the scale problem of the pressure gauge.

The gears, even pointers and other parts in the pressure gauge are very simple, they are completely made by hand, which is quite simple.

"Boss, are you?" After Yang Heng took out his masterpiece for the past few days, the workers on the scene wondered what this thing was for. A glass disk with a pointer inside, and there were some scales on it, and the scales were from one to ten, and a pointer was in a position of one.

"This is a pressure gauge, which is used to detect the air pressure of the steam. Once the boiler is tested successfully, such a pressure gauge will be installed to allow workers to see clearly the current steam pressure. Of course, there must be a safety device on the boiler. Once the pressure we set is reached, it will be automatically exhausted."

And while Yang Heng was making the pressure gauge, there was already a boiler that was burnt and it was necessary.

"Boss, I'm sorry, we're too anxious and didn't really follow your requirements." "This means you know the reason, right?" In fact, Yang Heng knew from the time they made the boiler that their processes were a bit too saving, and Yang Heng estimated that the main problem was to make steel plates, and some impurities in the steel plates were not squeezed out, which was the reason for the explosion.

"Yes, boss, when we made steel plates, some of the time and times we made were not enough, and some of them forgot the weight of your hammer."
Chapter completed!