Kuroko's house lives nearby, and when you go out, you turn into an alley. He is an orphan, and when he was picked up by Lu Meng's father Lu Xian, it was just a full moon, because he was black, everyone called him Heizi, but Lu Xian gave him the surname Lu, so his big name was called Lu Heizi.

Because he was a domestic servant, the Lu family was particularly relieved of Heizi and arranged for him to enter the army to develop with Lu Bu. It wasn't until a few years ago that he offended people and couldn't get along in the army, so he was thrown to the Hundred Soldiers as an overseer. He is neither a shopkeeper nor a buddy here, nor is he a craftsman, but as long as he wants to take care of it, he can meddle in the affairs of the entire store at will.

After eating at Kuroko's house, the two talked about weapons again, and Tianyou finally said the reason why he came to Beicheng today. As soon as Kuroko heard that he was looking for a suitable stove, he immediately slapped his thigh. "You said it earlier! That's what we're doing!"

Tianyou was originally embarrassed, after all, the grade of people's stores was there, and the cost of using their things was high, and Tianyou was really embarrassed. Helplessly, Kuroko was too enthusiastic, saying that he would borrow everything, and he didn't charge rent, only consumables.

Tianyou also really needed it, and he agreed to it under the graciousness. However, he was embarrassed to occupy someone's stove during the day, so he suggested that he should use it at night and finish it tomorrow morning.

Kuroko had long felt that Tianyou was an expert, and he couldn't wait to see what Tianyou could make, so he said hello to his family and took Tianyou to the store together.

I heard that the curfew was very strict during this time, but Tianyou didn't expect it to be so strict. As soon as the two of them came out of the alley, they saw a team of soldiers in armor and holding a skull coming over, and when they saw the two of them, they immediately picked up their weapons, but Kuroko walked over with Tianyou like no one.

The sky was not completely dark, and as soon as the two sides approached the opposite side, they could see the figure of the sunspot clearly, and immediately put away their weapons. "Brother Hei, if you don't go home so late and still hang outside, won't you let your sister-in-law drive out?"

"The sixth son is capable. You dare to make jokes with your black brother, your ass doesn't hurt, right?"

"Oh, you raise your noble hand, this little ass still has to sit on the bench. ”

These two sides are very familiar when they hear it, and they pass after a few jokes, and the other side obviously saw Tianyou, but they didn't even ask. Sure enough, the identity of the sunspot is still very weighty, at least among the lower classes.

Outside the shop, Kuroko knocked on the door, and after a while an old man came over and opened the door. "Kuroko, why did you come back again?" The old man was a craftsman in the shop, he had no children and no daughters, and his wife had also passed, so he volunteered to live in the store to watch the store, and he didn't need extra wages, and he rented out the house at home and got all the money back.

"I'll bring my little brother over to get something. Kuroko pulled Tianyou into the store.

"You need to use a stove. It just so happens that I just sealed the stove and it's still hot, so I don't need to relight the fire, I can continue to use it with some firewood. ”

"That's a lot easier. "At this time, the stove used to burn wood, and to make weapons, the whole furnace needs to be heated a little bit before the temperature is raised, which is a very cumbersome process. Because of this, many large stores do not turn off the stove all night, and even if they do not make iron, they will leave a fire head to keep warm. However, the 100.Bingfang is a little different, they take the high-quality route, and they don't have to start work every day, so they will close the furnace at night.

"Trouble the old man. Tianyou followed behind the sunspot and said politely.

The old man hurriedly and modestly: "What's not troublesome, the old man has little sleep, I can't sleep so early if you don't come, it's quite boring, and now it's just time to relieve boredom." ”

The old man re-tied the door of the shop and went with them to the backyard.

This is the first time Tianyou has come to the backyard of the Hundred Soldiers, and he has only seen it in front before. Before, he was guessing what kind of stove would be used in this high-end workshop, but he was dumbfounded when he came in.

"Holy, centipede furnace?"

"Hehe, if I didn't blow it, I couldn't have found a better stove in the whole royal city. Kuroko proudly showed off.

Tianyou looked at the centipede furnace in front of him and thought not of the quality of the stove, but the question of whether the money was enough. He had only twenty taels of silver left on him. For ordinary people, this is a huge amount of money, but the productivity level of this Shenzhou Continent is extremely low, iron ore is very expensive, plus some other materials, these twenty taels will be enough.

However, a centipede furnace actually appeared in front of me, how to play this?

Centipede furnace can think of the approximate shape by listening to the name. It looked like a chimney lying flat on the ground, with a pair of windows at intervals, one side for the fire, and the other for iron forging. These folio windows, together with the long furnace itself, look like a large centipede when viewed from above, hence the name centipede furnace.

There are two types of such stoves, one that is as big as it is from beginning to end, and one that is large and one that is small. The former is used for mass production, which can ensure that the quality of the same batch of products is the same, and because it is a series of furnaces connected together, it is equivalent to eliminating the adjacent furnace walls between multiple furnaces, which greatly reduces heat loss, which is equivalent to saving fuel and increasing the furnace temperature.

The second type, one large and one small, centipede furnace is dedicated to Seiko.

This kind of centipede furnace gradually shrinks and becomes smaller from one end, and the furnace wall is getting thinner and thinner, and the filling is only added to the first, third, and fifth windows on the big head, and the furnace behind does not make a fire, so it relies on the heat transmitted from the front to maintain the furnace temperature.

Because only windows 1, 3, and 5 have fire, windows 1 to 6 will produce different furnace temperatures, which can be changed into a gradual temperature ladder with a little control. In fact, the higher the temperature required in the smelting process, the better, sometimes the high temperature is required, and sometimes the temperature is just right, so if there is a cascade temperature control furnace, the heating temperature of each process can be accurately controlled.

If there is only one furnace, there is definitely no way to complete this change of temperature control, and if you put multiple furnaces, when you change the temperature, the objects that need to be created temporarily leave the furnace and enter the cold air, no matter how fast you move, this process will have some impact on the performance of the weapon. But the centipede furnace does not have this worry, the sword embryo and can be transmitted in the furnace chamber by a special structure, moving from one furnace window to the next window, and the middle will not reheat.

In addition to the need for precise temperature control during heating, the same is true for cooling. Some metals need to be cooled quickly to produce a metal lattice at the edges to improve hardness, while others must be slowly cooled to release internal stresses to obtain good toughness, so annealing is a very important process in the process of making weapons.

For metal parts that need to be cooled quickly, it is enough to use various methods to cool down quickly outside the furnace, but what to do with the ones that need to be cooled slowly? The best thing to do is not to get out of the furnace and move it backwards little by little along the window of the centipede furnace. The farther away from the front window, the lower the temperature, and the craftsman only needs to control the position of the sword embryo according to his own needs to anneal at the most reasonable temperature, which is definitely something that ordinary stoves can't do.

These are the advantages of the centipede furnace, but it actually has a disadvantage that is not a disadvantage, that is, if you only make a weapon, then the cost will be very exaggerated, because the centipede furnace is a whole, and there is no way to ignite only a certain area, otherwise uneven heating will cause the furnace to crack.

This situation determines that the centipede furnace is a high-consumption and high-output equipment, and Tianyou only needs to make a few things, such a large stove, I am afraid that it will cost a few taels of silver firewood to light a fire, what should I do?