After Yang Fan finished eating, he looked at his watch. It was already eight o'clock.
Get ready to take a short break by watching videos online.
The advantage of the ring being able to connect to network signals at close range cannot be wasted.
Watched some funny videos for a while.
A guy is live streaming.
"Dear dear friends, dear friends. Come and see"
"Cockroaches are engraving. Cockroaches are engraving. Various names are engraved on them. The big cockroach with ten lives in the south is genuine and easy to raise. It will not die even if your cat dies."
"The back is no less than three centimeters, and the words are engraved in gold powder and will never fade. A cockroach is limited to four characters."
"Carry your leader, your predecessor, and your enemy"
"To relieve stress and relieve anger, today's big sale, only 199. Ship with favorable wind, and the mission will be achieved. I will also give you a cockroach breeding tank. Action is worse than action. Dear friends, hurry up and place your order."
Yang Fan was also drunk, giggled for a while, and felt much better.
While flipping through the pages, I suddenly saw a video by a guy named ****UP who showed how to make a small iron-making furnace with mud in the wild and then use charcoal to make iron. He also made his own spear head.
Yang Fan felt that this guy was more than just a player, he seemed to know how to cast.
After Yang Fan followed him, he discovered that he was live broadcasting.
"Dear friends, I made a replica of the Han Dynasty toilet chip. It is carefully polished and has no burrs. I have said it is good after using it. It only costs 33 yuan each, and there is also this emery brand toilet paper. It is specially designed to treat constipation in the elderly. The more you wipe it, the cleaner it gets."
Damn, this is also a talent.
Emery toilet paper, thinking about the sour feeling, Yang Fan shivered.
Directly brushed a rocket.
This guy's live broadcast is rather bleak. At most, I received a small warning.
A rocket costs 50 yuan. I am so excited.
A close friend.
Thank you very much Lao Tie.
Yang Fan immediately sent a private message to WeChat.
Passed as expected.
The avatar is of a fat man with a fat head and big ears.
"Brother, are you a foundry?"
"Yes, I have worked in a large state-owned factory for ten years."
"I have a few questions I would like to ask you. If you can help me solve them, I will give you ten rockets."
"Boss, please tell me," the fat man was so excited.
Yang Fan directly took a photo of the explosive gun he forged and sent it over.
"Hey, it's a magic gun, or a nine-section magic gun. Old man, you are really a top player." Fatty was pleasantly surprised. He is the leader of a group of ancient weapon enthusiasts. There are more than 3,000 people in the group, distributed all over the country. I like to play with armor and weapons.
"You're just playing around," Yang Fan said humbly. "How to call it"
"Wu Hua, where are you, old man?" Fatty Wu asked.
"Yang Fan"
"Did you cast this yourself?" Fatty Wu is really professional. "It seems that the cooling time is not long. I must have done it in the past two days."
"You really experimented with gunpowder. Hehe, old man, you are really good at playing. If Popole discovers this, it will be a big deal."
"You won't report me?"
"Looking at what you said, how can I do it if you are the sponsor? Besides, we are all enthusiasts who play this game, so we understand."
"Can you see what's wrong with me? Why it keeps blowing up."
"You must be using an ancient method. I enlarged the cross-sectional view of the explosion. I used an earthen furnace to make the iron myself, and cast it with clay molds and sand. Tsk, it's a complete set. I'm really good at it."
"I just want to use ancient methods to make ancient firearms, so that they are authentic and interesting."
Fatty Wu sent a thumbs up, and then knelt down and bowed to the image.
A line of big red characters, Great God, please accept my worship.
"The reason why I am suing you is very simple, but a layman will definitely not understand it."
Fatty Wu said eloquently.
It turns out that there is a problem with the clay mold. It takes a long time to dry completely, but no matter how hard it is dried, there is still water vapor inside.
When casting, the molten iron will quickly evaporate the clay mold when heated, but part of the evaporated water vapor will enter the iron.
Bubbles will form. If there are bubbles, it will not be strong and the strength will be greatly reduced. It will explode.
In addition, in order to ensure that the barrel is not exploded, the barrel is made thicker, so that when cooling, the heat dissipation conditions of the inner tube wall and the outer wall are different.
First, the inner tube wall area must be smaller than the outer tube wall. The heat dissipation area is small and heat dissipation is slow.
In addition, the internal ventilation is not good, and it is difficult to dissipate heat inside. In fact, it always gets cold inside when the outside is cold.
This results in different cooling rates, which creates stress, causing cracks inside the barrel that are invisible to the naked eye, creating hidden dangers of cracks.
In terms of mechanical properties, the inside of the barrel is subject to the boring pressure of gunpowder and must be the hardest and most wear-resistant.
In terms of casting characteristics, the faster the metal cools, the harder it becomes. This results in something hard on the outside and soft on the inside.
The barrel needs to be hard on the inside and soft on the outside. Being soft on the outside can increase toughness, which is more beneficial to preventing the chamber from exploding.
"Is there any way to solve it?" Yang Fan asked.
"Ten rockets, a complete solution!" Fatty Wu sat on the ground and raised the price.
"The platform has made all the money you paid for gifts. How about I send you a 200 red envelope?"
"make a deal!"
Fatty Wu gave a solution.
First, abandon clay mold casting and use iron mold casting. The iron mold has no water vapor and no bubbles.
"The clay mold is disposable and can be broken. Take out the inner barrel. Use iron to make the mold. After pouring, won't the molten iron stick to the mold after it cools down? The mold cannot be removed."
"Stupid, don't make direct contact. First, brush a layer of graphite powder inside the iron mold so that it won't stick to it. After it cools down, just remove the iron mold. The two pieces of the iron mold are buckled together. The large ones are also assembled. In the end, the graphite powder on the casting is removed with sandpaper and it’s over.”
Yang Fan was enlightened and realized that he could still do this.
"Also, think about it, for clay mold casting, you have to make a set of wooden molds first, and make a set of one gun barrel. How much does it cost?"
"The iron mold can be used repeatedly. How much money can be saved? It is more cost-effective in terms of time. The clay mold needs to be dried in the shade, which takes ten and a half days. The iron mold can be used repeatedly. One iron mold can cast hundreds of gun barrels in one day."
Yang Fan was dumbfounded. This is the difference between an expert and an outsider.
Bubble problem solved.
"How to do cooling? There are still cracks that have not been resolved."
"There are two methods. First, water cooling. This requires some experience. Water is limited to a maximum temperature of 100 degrees. The cooling speed is too fast. An experienced master is required. Otherwise, cracking will be aggravated. Repeated quenching can also improve Hardness and strength, enhancing the performance of the barrel.”
"The second method is to use oil quenching. This cost is high, but the boiling point of oil is high and the cooling rate is slow, so the effect is better."
Yang Fan understood.
"Lao Tie, I can make the iron mold for you. You just need to give me the dimensions, and I will use the machine tool to process it for you and mail it to you."
"how much for one."
"Not expensive, free shipping for a set of 200. Free usage and quenching process documents"
"Five sets."
Yang Fan didn't hesitate and directly transferred 600 to Fatty Wu. Pay the other half upon delivery.
The address was just for him to mail it to the teleportation factory. Instead, he asked Monkey to take it to the warehouse and put it away, and then he could secretly teleport it over by himself. Small objects don't use much energy.
Yang Fan keenly felt that this technology was no small matter. Since it could be used on cast gun barrels, it could also be used on artillery.
And if this technology is given to Song Yingxing, it is equivalent to being given to Xu Guangqi. Giving it to Xu Guangqi is equivalent to giving it to Sun Yuanhua.
Sun Yuanhua can't even handle his own subordinates. Give it to him as a gift to Jian Nu.
If he wants to win over Song Yingxing, he must treat him with sincerity. Whether Song Yingxing knows about this technology is a headache.
