doomsday survival

Chapter 286
The electric welding was accompanied by sparks flying around, emitting a dazzling light, and Feng Chen and the others who were watching were so frightened that they blocked their eyes and hid back, even exclaiming incessantly.

Feng Kuang, who knew the power of electric welding for a long time, didn't watch the excitement at all, but kept his back to Shi Jian, and laughed amusedly when he saw Feng Chen and the others, and said: "Boss Shi doesn't care, you are afraid What a strength."

Feng Chen smiled embarrassingly, stopped yelling, and said: "This is really scary, I can't see anything now because of the shaking. Also, did Elder Feng know about it a long time ago, and didn't tell us about it?" One sound." There was a trace of complaint in his tone.

Feng Kuang laughed non-stop and didn't speak, he knew that An had no good intentions at the beginning.

Shi Jian stopped, removed the goggles that blocked his eyes, and said, "Forget about this, the welding light is too strong, don't stare at it, and be careful that you won't be able to sleep at night."

Several people imitated Feng Kuang and turned around. They only dared to turn their heads when Shi Jian stopped and asked them to pass things. The rest of the time they were rubbing their stabbed eyes.

But after all, they watched for a short time. Shi Jian welded up the work ladder, and they were almost healed, and their eyes did not stop crying like they did at first.

After setting up the working ladder, Shi Jian and Feng Kuang began to study how to smelt cast iron. The two of them took their mobile phones, called up relevant information from it, and started to study together.

After seeing the characteristics of cast iron, Feng Kuang said to Shi Jian: "Besides making tools, I think the best use of cast iron is to make shells or shells for grenades."

Shi Jian nodded and said, "That's right, especially white cast iron, which is very brittle. It's good for shells and grenades, but it's not good for making tools. Let's try it now. If we can't make pearlite Gray cast iron, then use it to make grenades and more weapons. But it’s better to make it into ductile iron, unfortunately we will definitely not be able to do it these two times.”

Feng Kuang said boldly: "That's not necessarily the case. You have all the precautions that should be in these materials. We can try a little bit. Instead of thinking about it here, it's better to do it directly."

Shi Jian smiled and said, "Okay, let's do the preparatory work first. When everything is ready, we will start the furnace and smelt the first batch of cast iron, and see what we can get!"

In fact, there is a lot of preparation work. The cupola uses coke, and there is a lot of inventory in the workshop and the coal yard. Shi Jian doesn't know how much he needs, so he asks Fengchen and the others to go to the coal yard to pull it here as much as possible.

In addition to the coke, there is also the required iron material. Shi Jian asked everyone to go to the steel factory to collect some scrap iron, and not use any steel that can still be used, and save it for future processing.

The group got busy immediately, while Shi Jian returned to the fire brigade and found Zhang Weiqiang who was learning how to use a woodworking lathe.Because electricity was not a problem, when Shi Jian returned this time, he deliberately picked out a good woodworking lathe, and handed it over to Zhang Weiqiang for research upon his return.

"Wei Qiang, what's the matter, have you figured it out?" Shi Jian asked.

Zhang Weiqiang chuckled and said, "It's not too much difference, this thing is still very simple, and it's also much more convenient."

Shi Jian nodded and said, "Okay, I'll draw you two pictures, you can make them out of wood, it will be of great use to us tomorrow."

Zhang Weiqiang chuckled, and said: "No problem, Mr. Shi, if you ask me to do other things, it may not work, but if I do carpentry, then there is absolutely no problem."

Shi Jian dragged him back, took out a pen and paper, and quickly drew a three-view image of something, and handed it to Zhang Weiqiang, waiting for him to make a model.

Zhang Weiqiang saw it, laughed again, and said, "Boss Shi, this is too simple, I'll figure it out for you in a while."

Shi Jian held him back and said, "Remember to carve those patterns on it, otherwise it won't work. After you finish this, you can make other things." After speaking, he lay down on the table and continued to draw.

Shi Jian finally drew two design drawings in total.The first one is actually the shell of a grenade. The pattern he just mentioned is actually the pre-fragment of the grenade. This one is going to be cast with white cast iron.

The second picture is more complicated, and it is divided into several parts. Zhang Weiqiang knew it at a glance. This is the plow that Shi Jian taught his father and son to make last time.If pearlitic cast iron can be smelted, Shi Jian will use it to cast plows to prepare for next year's spring plowing.

After Zhang Weiqiang finished these two things, Shi Jian said again: "You also make some heavy tools such as hoes, picks, and hammers yourself, and we will cast a batch at that time."

Zhang Weiqiang readily agreed. He has done all these things, and it is not a troublesome tool. It is very convenient to do, especially after having a woodworking lathe, the speed has increased significantly. Not 01:30.

After everything was finished, Shi Jian asked Zhang Weiqiang to make a few more wooden boxes, and then the two of them ran back to the foundry with the pile of things. ,

These wooden models are stone solids ready to be sand molded and then cast into finished products.There are a lot of materials needed for sand molds in the foundry, and it is not difficult to find. Shi Jian also saw how workers make sand molds during his internship, so he knew a little bit about it. Coupled with the information in his mobile phone, he started to try. Make it up.

Shi Jian first chose a wooden box, filled it with wet sand with adhesives added, then put a model in it, tamped the sand to keep its appearance flat, then drew a line on the model with a pen, and took out the model .Then make another half in the same way, so that the two halves together form a complete sand mold.

Of course, the process of making was not as smooth as it was said. Shi Jian, who made it for the first time, did not have any experience, and the proportion of the binder was not well grasped. The sand molds made at the beginning were not formed, let alone casting.

Feng Kuang also studied with him, and found the most suitable ratio after many twists and turns, and finally made the first sand mold successfully.

With the experience of the first one, the latter will be much easier. The most difficult thing should be the grenade, because the inside is hollow. The final method is to make the grenade as a whole, and the other part is glued to the cover. The board, together with the box below, constitutes the sand mold of the grenade.

After the sand mold is made, it cannot be used immediately, but must be dried, and the dryer in the foundry is no longer usable.Shi Jian asked for some electric heaters to surround the sand molds for drying.Fortunately, there is a room in the foundry that is well sealed, otherwise, in this severe winter season, I don't know how long it would take to dry the sand molds.

Even so, the furnace failed to turn on the next day.On the one hand, the sand mold is not completely dry, and on the other hand, Shi Jian and Feng Kuang have not figured out how to use the cupola.So for a whole day, the two of them were cats at home, researching non-stop with their mobile phones.

Of course, the rest of the people were not idle during this period. They were led by Feng Chen to continue searching the factories, carrying a power cord with them, and pulling a small generator. See if it can start.Although they don't know whether these things are good or bad, they can still see if the indicator light on it is on or not, and whether the electric switch trips or not.

After some inspection, they also found a lot of usable equipment, and marked them one by one, and prepared to let Shi Jian come over to have a look when he was done with work, so that there was no delay.

Shi Jian and Feng Kuang have been researching for five days, and Feng Chen and the others have almost transferred the industrial park.

After breakfast that day, Shi Jian asked Feng Chen, "How is it going, how many places have you not gone yet?"

Feng Chen replied: "Basically, I have been there now, only the pharmaceutical factory in the northeast corner has not been visited yet."

Shi Jian trusted Feng Chen very much, and he and Feng Kuang had been studying the casting process these days, and did not ask about what Feng Chen and others had obtained. After hearing that there was only one pharmaceutical factory left, Shi Jian said: "Where is the first No need to go, it’s not too useful, let’s start the furnace to make iron today.”

In fact, everyone had been waiting for this day for a long time. Hearing what Shi Jian said, they all cried out with joy.Feng Chen asked: "Boss Shi, there shouldn't be any major problems, right?"

Shi Jian nodded and said: "Seven or eight, at least white cast iron can be smelted, and we can add a batch of grenades anyway."

Even though he said that, everyone could see the confidence in Shi Jian's words.

"Great, we can finally use the ironware we made ourselves." Zhang Jian sighed.

"What is this? Sooner or later, steel can be smelted." Yi Hengge said from the side.

Shi Jian shook his head and said with a smile: "Steelmaking will definitely fail this year. We need to build another open hearth furnace. Next year, there should be no problem."

A group of people came to the casting workshop talking and laughing, and Shi Jian began to direct everyone to add coke to the cupola first.

Originally, in the factory, these tasks were all mechanized, but those charging machines were no longer available, so Shi Jian adopted the most primitive method, adding coke manually from the feeding hole of the cupola.

It is said to be the most primitive, but it is not. In order to save manpower, Shi Jian specially asked Zhang Weiqiang to make a set of pulleys, and the pulleys used were not wooden pulleys, but steel pulleys found in the factory. Zhang Weiqiang just built a shelf That's all.

During the smelting process, the lower part of the shaft is filled with coke, called bottom coke.Put iron materials on top of the bottom coke. These iron materials are pig iron, scrap steel, etc. collected by Feng Chen and the others.Then there are coke and fluxes such as limestone and fluorite, all found in this factory.Then iron material, coke and flux are alternately placed in batches until the container is filled.

It sounds like a lot of things need to be installed, but in fact, this cupola is not very big, it is just a small two-ton furnace.Of course, there are also large furnaces in this factory, but they are full of cooled molten iron, which has been discarded.

After filling the material, Shi Jian turned on the blower, and then ignited the layer of coke.The blower blows out a strong wind, which makes the bottom coke burn violently, and the high-temperature furnace gas generated rises along the height of the furnace body, melting a layer of iron material on it.

The molten iron drips down and enters the hearth through the heavily burned coke. In the process, the high-temperature furnace gas and hot coke are further heated. This is what ironmaking calls overheating.

With the burning of the bottom coke and the melting of the upper layer of iron material, the material layer gradually decreases. After each batch of furnace material is melted, the fuel is supplemented by the additional layer of coke, so that the height of the bottom coke basically remains unchanged, and the whole melting process is carried out continuously. .

In this way, as long as iron and coke are always added to it, the melting process can be guaranteed to be uninterrupted, which is indeed very convenient, and the energy consumption is far less than that of electric arc furnaces and other furnaces, and the equipment is very simple, so it is no wonder In the 21st century, cupolas are still in heavy use.

Everyone looked at the black smoke coming out of the cupola, and felt a little uneasy in their hearts, not knowing whether it would be successful.

But their worries are obviously unnecessary.After a while, molten iron appeared in the hearth. Looking at the glowing red molten iron, everyone cheered for victory together.

"Success!" Shi Jian clenched his fist and swung it down, shouting loudly.

"Yes, we succeeded!" Feng Kuang murmured, "After so many years, we finally saw this red molten iron on the earth again, and we ushered in the Iron Age again." Get wet.

Everyone else embraced each other, celebrating the success of ironmaking.

Seeing Feng Kuang's sentimental look, Shi Jian went over and patted him on the shoulder, saying, "Old Feng, you should be happy, this is a milestone."

Feng Kuang wiped the corners of his eyes, and said in a trembling voice: "Yeah, I should be happy, but unfortunately, the old cripple can't be seen anymore. Back then, we failed many times in making steel, and now we finally succeeded, but he Didn't see it."

Listening to Feng Kuang's incoherent words, Shi Jian sighed, and said, "Don't worry, Lao Feng, we will go back to see Lao Chen sooner or later, and we must tell him the good news when the time comes."

Feng Kuang glanced at Shi Jian, and said in a deep voice: "Shi Jian, I may not last until that day. If you can go back, remember to ask me to take it back and be a companion with Lao Chen."

"Look at what you said," Shi Jian said dissatisfiedly, "When the time comes, you have to tell him this in person, and I won't do it for you." Then he lowered his voice and said, "I'm so much older than you, so I don't worry about it." , what are you worried about?"

Feng Kuang was amused by Shi Jian, and his sadness disappeared all of a sudden. He said heartily: "Yeah, you are not worried, why should I be worried. I have to live well, and I can't leave anyway. Go ahead of you!"

"That's right," Shi Jian said with a smile, "Now let's start casting."

When it comes to casting, Shi Jian and Feng Kuang's eyes are dark. Although the information says, what kind of cast iron will be produced when the temperature is kept warm and then lowered, but they don't have thermometers, and they don't have those. The old workers can use the color to judge the temperature, so they really don't know when to cast.

Anyway, this first furnace is also an experiment. There is a layer of iron material in it, so I don't worry about wasting much. At worst, it will be returned to the furnace for resmelting.Therefore, Shi Jian waited until the molten iron in the hearth passed the three-hour heat preservation period, and then put it in the forehearth to cool it down.

After cooling for more than an hour, Shi Jian brought people to start casting the castings.

Shi Jian first used a stainless steel bucket to fill a small half bucket of molten iron in the forehearth, and then poured it into a test sand mold.This sand mold can only cast a piece of iron.

After the iron sheet cooled, Shi Jian broke open the sand mold, took out the iron sheet from inside, and then broke it with a hammer. When he observed the fracture, he saw that the fracture was white. It seemed that this time it had been smelted into white cast iron. .

Although he didn't get the pearlite he wanted, Shi Jian didn't show any signs of frustration. After all, he had made a batch of grenade casings before and needed white cast iron.

During the few days when Shi Jian and Feng Kuang were studying the iron-making process, Zhang Weiqiang was never idle. Others went to search the industrial park, and he kept making sand molds here.In addition, white cast iron is the easiest to appear, so Shi Jian specially asked him to make more sand molds for grenades.As a result, the cast iron produced this time was only one hundred catties, all of which were cast by Shi Jian into grenade shells, and there were still a lot of sand molds left.

"Old Feng, it seems that you still have to do your old job, go make explosives, we have to use grenades." Shi Jian joked to Feng Kuang.

Feng Kuang nodded, and said: "Well, let's put it there first, and I will make explosives later. But when it comes to my old profession, there is one more thing that I need to talk to you about."

Shi Jian didn't know what Feng Kuang was going to say, so he asked, "What is it, is it important?"

Feng Kuang nodded and said: "It can be said that it is very important. You see, although there are a lot of stocks in the chemical plant, those things are getting less and less the more they are used, and there will always be a day when they will be used up."

"That's right," Shi Jian agreed with Feng Kuang's statement, and guessed what Feng Kuang wanted to say, so he asked, "Do you want to start the chemical industry?"

"Yeah, I can't do it without it," Feng Kuang sighed, and said, "Think about it, I'm so old now, if I don't get involved in chemical engineering, if something goes wrong at any time, this point in my head Everything is up to me, so I have to find a student to pass on all these things, and if I really disappear someday, you won’t be able to sit back and eat.”

Hearing Feng Kuang say such dejected words again, Shi Jian asked with concern: "Old Feng, do you feel uncomfortable in your body? Otherwise, why are you so sentimental?"

Feng Kuang shook his head and said: "My health is very good, but seeing that the iron smelting was successful today, I feel a little bit in my heart."

Only then did Shi Jian feel relieved, and said, "Just as long as you are fine, don't worry about those things that are useless. Our good days are in the future. When we finish the iron smelting, we will help you clean up the chemical plant." Production resumed."

Feng Kuang said with a smile: "Of course, things have to be the same, just like we do chemical industry, we have to produce three acids and two alkalis first, isn't that the reason?"

　Huyue checked the information for a day today before he got this chapter out. There may be some mistakes in it. Please forgive me, and you can bring it up so that I can correct it.

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(End of this chapter)