The Rise of Ming Dynasty 1646

Chapter 41 Cannon Casting Expert
Everyone was shocked when they heard the words, especially Xu Erlu, an expert who believed it deeply-the air hole has always been the main culprit of the bombing, without the air hole, the yield rate will inevitably increase exponentially.And there is no need to polish the barrel, this step alone can save at least ten days!
In fact, there are many advantages of iron mold casting guns that Zhu Linmi did not mention, such as the iron inner mold is stable, and it is not easy to be skewed during pouring.In addition, the iron fan is fast to take off the fan, and the gun body is still red hot after the fan is removed. Processes such as trimming the unevenness of the gun body and drilling the fire door can be carried out at this time, which is easier than doing it after the gun body cools down. times.

At the end, Zhu Linmi simply added, "Of course, I will solve the technical details."

Then he began to tell Xu Erlu and the craftsmen the process of Tiefan casting cannons in detail.

Iron molds are also iron products, so it is natural to use clay molds to cast them first.So first of all, you need to make a clay mold, which is just the opposite of the clay mold for casting a cannon, which is equivalent to kneading mud into a cannon.

However, compared with cast cannons, the mud fan of the cast iron fan does not have to worry too much about the air hole problem. After all, it will not bear too much pressure, so the clay fan of the cast iron fan is much easier to make.

For the convenience of taking off the fan, the iron fan is not cast into the size of the whole cannon, but divided into several sections.The two-thousand-jin cannon can be divided into four sections.Each segment is further divided into left and right halves.

When casting the cannon, buckle the two petals of each section together, then stack all the sections, and tie the outer layer tightly with iron hoops up, down, left, and right.

Immediately, some craftsmen asked questions, "What if the cast copper water and the iron mold are burned together?"

The craftsman in his hometown who used iron formwork to make agricultural tools smiled and said: "Anyone who has cast hoes and iron forks knows that the inner wall of the iron formwork needs to be painted with a layer. The blacksmith in the village usually uses fine ash, mud and sand to coat the inner wall with water, and then Brush again with soot and water."

Zhu Linmei nodded, "Exactly." In fact, the cladding on the inner wall of the iron mold is the same material used for sand casting.The molding sand used for casting in later generations is generally a mixture of extremely fine sand, fine clay, tung oil, and carbon powder.However, casting such a large part as a cannon does not need to be so fine, and the local method is enough.

After confirming that the model craftsmen had figured out the details of the process, Zhu Linmi ordered everyone to start making clay models for cast iron models.

Making a cannon-shaped clay fan is easier than before. In order to ensure the uniformity of the entire clay fan, the current fan-making process is to put the mud fan on a huge wooden pole and rotate it continuously, and use centrifugal force to make it even in all directions.

Cylindrical clay molds are naturally more convenient to rotate with wooden poles, unlike clay molds used for casting cannons, which need to be supported by many wooden pieces.

These craftsmen are skilled in skills, and it only takes one afternoon to make the clay model.In order to speed up the drying process of the mud form, Zhu Linmei also asked the craftsmen to add some gypsum to the raw materials of the outer layer of the mud form.And just to be on the safe side, he also asked the craftsmen to make a few more clay models for backup.

After the craftsmen put the mud fan in the shed, all that remains is to wait patiently for it to dry in the shade.

After a day of contact, Zhu Linmei learned that Xu Erlu was a famous candidate, and he had only been in charge of the Ganzhou Arms Bureau for two months.

It was Yang Tinglin who relied on his personal friendship to ask him to travel from Shanghai to Ganzhou for help in order to cast the cannon.

Xu Erlu originally thought that he already had a lot of experience in casting cannons, but it was only after meeting Zhu Linmei this time that he knew that there was someone out there.

In addition to the iron cast cannon, the concept of rifled cannon, breech breech breech breech, and optical sight that King Chenzhou mentioned during the conversation made him dumbfounded.Although it all sounded extremely unbelievable, Zhu Linmi felt that it was very reasonable for him to say that, and it was even expected to be realized soon.

It was night, and Xu Erlu personally sent the night snack to the posthouse where King Chenzhou stayed, and then took the opportunity to ask for some "high-tech" knowledge of cannon casting.

Zhu Linming doesn't keep her secrets, she answers every question, and it's a matter of whether she can cultivate one more technical talent for Daming.

Later, the two talked about casting cannons to firearms, and from firearms to natural sciences. In the end, Zhu Linmi simply talked about all kinds of mathematical, physical and chemical knowledge.

This Xu Erlu is also quite good, he has a very solid foundation of modern scientific knowledge, he can understand [-]% of what Zhu Linmi said.

The more he listened, the more amazed he was. Zhu Linmi had all kinds of unheard-of concepts, theorems, and formulas at his fingertips, and the angle of thinking about the problem was extremely novel, which made him suddenly enlightened in a short while.

Seeing that it was late at night, he didn't dare to delay Zhu Linming's rest, so he wanted to get up and leave. Before leaving, he all said with emotion: "Xiaguan's grandfather has studied geometry and arithmetic for many years, and Xiaguan thinks he is a leader in this field in Ming Dynasty. When I arrived at Your Highness, I realized that the knowledge of the lower officials is really limited."

"Study geometry and arithmetic?" Zhu Lin's heart skipped a beat, thinking she is the best?He hurriedly asked: "Dare to ask your ancestor's honorable name?"

Xu Erlu Surong cupped his hands and said: "Return to Your Highness. The grandfather of the Xiaguan is the second assistant of the cabinet of the Chongzhen Dynasty, and he is taboo to be enlightened."

"Guangqi?" Zhu Lin was stunned for a moment, Xu Guangqi? !

No wonder he dares to say that he is a leader in geometry. This is the first scholar in China to translate "Elements of Geometry", the "Academician of the Chinese Academy of Sciences" of Ming Dynasty!

He suddenly remembered that Xu Guangqi had five grandsons with the word "er" in their names, all of whom had a lot of knowledge, and eventually reproduced a huge family.Today's Xujiahui in Shanghai got its name because they used to live here.

Then Xu Erlu should be one of them.

No wonder he has a solid foundation in geometry and mathematics, and has a lot of research on casting cannons. It turns out that he has a family background.You must know that since the death of Xu Guangqi in history, it has been difficult for Daming to cast high-quality Hongyi cannons.

Yang Tinglin's ability to invite Xu Erlu to manage the Military Weapons Bureau is really a good general.

Zhu Linmei hurriedly saluted and said: "I have admired you for a long time. Your ancestor is indeed the No. 1 enlightenment of geometry in the Ming Dynasty! Many of the things I have learned are derived from "The Elements of Geometry."

"How dare you do it." Xu Erlu hurriedly said, "If the old man is still alive, I'm afraid he will have to ask His Highness for advice."

So in the next few days, whenever Xu Erlu was free, he would pester Zhu Linmi for various knowledge.

Zhu Linming simply followed Xu Erlu's foundation and began to teach him high school mathematics and junior high school science and chemistry courses, so that he can learn more systematically.

Three days later, Zhu Linmi asked people to move the clay fan to a ventilated place, and placed a charcoal fire five feet away to smoke it.Usually, the casting mud fan needs to dry in the shade for more than a month, but he doesn't have so much free time.

In fact, he was not reckless in doing so, for one thing, the clay mold used to make the iron mold is divided into four sections, much smaller than the clay mold used to make the gun, and it dries quickly.Second, it doesn't matter if there are tiny cracks in the mud fan, just smooth it with mud water before drying it. The iron fan is not as delicate as a cannon, and it can be repaired and polished.

Before the casting of the cannon started, Zhu Linmi asked Qiao Qian to return to Longnan and bring the test gunner named Anthony who was recruited from Macau to Ganzhou.He has been working as a theoretical instructor of the artillery recently, and it is just right for him to come to the Military Weapons Bureau to display his expertise.

　Thanks: huafans01186487092, Mr Wang, Moth Fei, the past students, the past students, looking back, Cheng Yanhua, weather organic phosphorus students, empty students, random students, Fei & shadow Classmates, urban overbearing classmates, voted for me.Thank you for your support, thank you!
　　Because it is not easy for newcomers, I beg all the parents of food and clothing to collect, recommend and share more, thank you very much.

　　


(End of this chapter)