After a salute, Zhu Cihong smiled and said: "Okay, it's not the first time I've come here, and it's not the result I want to gather here to empty the ceremony." Let's go, the sixteen-year-old naval gun cast last time was taken by me to the Xingchen after the installation, you feel distressed, now that I'm here, don't say that it's been so long, and the follow-up artillery process has not been mastered. ”

"Your Highness, rest assured. The cannon casting is already correct. Jiao Miao was a little formal.

On the contrary, after Yang Ruoqiao on the side experienced life and death, he really had some aura, and he did not have stage fright in the face of Zhu Cihong's ridicule, and said: "If there is still stock in the workshop, it will naturally not be for the sake of His Highness's great cause." It is very meaningful that those cannons are all the first guns, which is why I have been thinking about them for so long. However, Your Highness can rest assured that according to the new method of cannon casting, our artillery production is now on the right track. ”

At this time, John Tang, who had not spoken, couldn't help but sigh with emotion: "The Ming people under the rule of His Royal Highness the Crown Prince are worthy of being the best nation I have ever seen. They are hardworking and kind, and they have been very efficient since their time in Beijing. Please let me marvel at the miracle of the Creator, his kindness to the Ming Kingdom. Unexpectedly, the West, which I thought could take the lead in technology, made me change my old view in Nanjing. ”

Several people walked towards the R&D workshop as they spoke.

Zhu Cihong's kind and peaceful attitude made Jiao Miao gradually relaxed, especially after mentioning professional issues, he became more casual, and said: "Speaking of casting cannons, we have really changed too much compared to the past. Normally, our artillery is built, and there are seven steps. The first step is to have good materials and refine the pig iron into mature iron. Put 5-7 pounds of pig iron. Only when there is only 1 catty left in the refining is it considered to be refined. Then the second step is to make the board. The third step is the reel, and the fourth step is splicing. Cut the ends of the two cylinders neatly. Use a few iron nails to join the two iron cylinders into one. Then it is to thicken the belly of the gun body, the charge, the firing place, and make the rough blank of the gun, and then hoist it on the shelf. After being put on the shelf, it should be hung with ink wire, and finally the fire door should be installed, and the door and door guard should be filed on the gun body. Step by step, you have to be a skilled old craftsman, and it is too hard to build. ”

Zhu Cihong said, "Oh? It seems that there has been a lot of progress now. ”

"And so many!" Jiao Miao sighed with emotion: "This is a lot of progress." It's really thanks to His Highness's craftsman compound that how many talents have been brought together. It is also at the expense of work and sympathy for craftsmen such as us, which can use so many people's talents and so much money in key places. For this reason, the three methods of clay mold casting cannon, sand mold casting cannon and iron mold casting cannon can come out one by one. ”

"Compared to the casting method, the casting method is much simpler." Yang Ruoqiao said.

The casting method is to use very dry nanmu or fir wood to make a gun mold according to the style of the cannon body. The two ends of the gun mold should grow more than a foot and make a shaft head. An iron swivel is added to the shaft head, and then the gun mold is placed on the rotating frame to rotate the mud. After the gun mold is made, the mold with the words "ear", "hoop" and "flower head" is installed. And use the fine coal ash to evenly paint the gun mold with a layer, and then use good glue yellow mud and sieved fine sand after drying, and mix it with two or eight phases. Mix into a puree and shake the wool apart. Mix it into the mud and make it "warp" after mixing. After the mud is adjusted. Paste it on the gun mold, then turn the swivel stick, swing it with a round wooden swing board, dip it in water and wait for it to dry. After drying, apply the mud again according to the previous method.

After the mud reaches a certain thickness, use a thick iron wire to wrap it from the head to the tail of the gun mold, and then apply the mud according to the method just now. When the required thickness is almost reached, the iron bar with a large finger is used to compare the length of the gun mold, the long one is used more, and the short one is used less, and it is evenly placed on the gun mold as a skeleton. Then, an iron hoop 1 inch wide and 5 minutes thick was used to evenly tie the iron bar from the head to the tail of the gun mold. Then put on the mud and swing evenly. After it is completely dry, the wooden core is taken out and the charcoal fire is put into the clay mold, on the one hand, to burn the clay mold, and on the other hand, to burn the ear, hoop and flower head characters into ashes.

After cooling, sweep out the ash and slag, place the bottom of the wooden mold, and then install the tail beads. Then put on the mud, after drying, take out the bottom of the wooden cannon mold, and then burn the tail beads with charcoal fire, after completely cooling, wait for the kiln casting.

"The mud mold was porous, and it didn't take long before it was discarded." John Tang said.

The clay mold casting cannon clay fan must be dried thoroughly, which is very inconvenient. If the hot metal comes into contact with a mud containing moisture, holes will form. The mud fan is not breathable, so the honeycomb holes will penetrate deep into the metal casting. Each cannon is cast in a separately crafted mold. In this way, the overall dimensions of the cannon of the same specification can only be approximate. And it is almost impossible for the molded core and the outside to become a straight line. Because the center positioning is not precise during pouring, the support cannot be very firm. Therefore, the core will inevitably move when it is hit by the hot metal. The internal chamber of the cast cannon is off-center and slanted. There are often small defects inside. The cannon chamber was irregular. Due to the material, many of them cannot be cut.

"Sand molds can solve some problems, huh?" These technical routes were all remembered by Zhu Cihong, and there were no professional obstacles at the moment, and for a while, the monarch and the minister got along, and the atmosphere was not harmonious.

"The sand mold cannon can overcome the defects of the honeycomb holes when the clay mold casts the cannon. If the hot metal is in contact with moisture, although there will also be loose areas, the use of clay is only 5 to 10% of the sand fan, and the air permeability is very high, so the range of loose areas is small, and the pores are very shallow, on the surface of the casting. It can be easily cut off. Even the iron that is made is not good, most of the pig iron castings are gray iron, and it is still not easy to flatten inside. John Tang said.

"Well, there's the most important point. The armament requirements of the army are very high, and these two casting models cannot be used repeatedly, and the clay molds have to wait for time to dry, which will make the process a great waste. It is enough to have a higher cost, and if the time is delayed, it may delay the military aircraft. Speaking of this, Zhu Cihong's expression became more serious.

At this time, everyone has also entered the R&D workshop.

Jiao Miao whispered a few words, and then began to demonstrate the iron mold casting method himself.

The iron mold casting method is to use iron as the mold, and when casting the gun, first brush two layers of slurry on the inside of each petal of the iron mold. The first layer of slurry is made of fine rice husk ash and fine sand mud; The second layer of slurry is made of fine kiln coal and water. Then, the two petals are combined, tightened with iron hoops, baked, and continuously continued, and finally the molten metal is cast. After pouring enough melt and cooling and forming, the iron mold is immediately peeled off according to the order of the mold flaps, like peeling off the bamboo shoot shell, gradually exposing the gun body, and then removing the mud embryo in the gun core, and the chamber is naturally slippery.

[The genuine version is the starting point of the Chinese network, search for a few words of micro-words, the last prince of Daming can support the genuine. ] Please pay more attention to my WeChat public account: a few words of micro-words. I just sent portrait photos of Zhu Cihong, Emperor Chongzhen, Empress Zhou and others, as well as physical pictures of the flying clippers, portraits of Zhu Cihong from caring readers, pictures of Xuanwu Lake, character images of Liu Ruyi, Qian Qianyi and Zhang Pu, and there are many interesting contents related to His Royal Highness and this story~ Hurry up and follow me on the WeChat public account! (To be continued.) )

PS: Recently, there have been some carvans.,Today's update is not stable.,Fortunately, it's finally written.,I'm sorry for waiting for a long time.