please make me king

Chapter 845

As soon as Zhang Shun finished speaking, Dudu Zhang showed off as if offering a treasure: "This ten-thousand-jin Hongyi cannon is one foot and seven inches long, one foot six inches in outer diameter, five inches six inches in inner diameter, and two feet one inch nine in width in tail. It can be charged with two hundred and forty taels of powder and four hundred and eighty taels of iron bullets."

"After the cannon was completed, the sound was like a thunderbolt, and the bombs were like thunder, and the cannon was corrupted for dozens of miles..."

"Wait, wait!" Zhang Shun reached out his hand to stop Dudu Zhang's bragging, and quickly did some mental calculations.

Sixteen taels a catty, isn't four hundred and eighty taels only thirty catties?
Zhang Shun remembers that the density of iron is [-] grams per cubic centimeter. He used the method of density measurement to deduce that in the Ming Dynasty a catty was about [-] grams, and in the Ming Dynasty an inch was about [-] centimeters.

Calculations in turn show that the shell weighs [-] kilograms and the caliber of the gun is about [-] millimeters.

Totally not enough!
Zhang Shun remembers the era of giant ship cannons in the later generations. There were no main guns above 200mm, so he was embarrassed to go out to meet people, and even some battleships had a caliber of more than 400mm.

Zhang Shun knelt down and poked out a straw stick, wrote and calculated on the ground for a long time, threw the straw stick, opened his mouth and said: "The original design was too conservative. When the caliber is expanded to [-] inches [-], the shell must be at least heavier." Fifty catties!"

Zhang Dudu almost cried when he heard this, my design is a heavy red cannon that fires [-]-jin shells.

Your boss opened his mouth and almost doubled the ammo for me. Isn't this a joke?
Is Zhang Shun joking?Of course not.

He is now in the process of casting the cannon, and after many experiments, he found a problem.

Most of the cannons that exploded exploded from the rear part of the cannon, to be precise, from the gun powder chamber.

Judging from Zhang Shunli's analysis of the force on various parts of the cannon using red copper, it can be seen that the pressure on the medicine chamber is far greater than that of other parts of the gun bore.

In other words, the modulus system from the West actually has a lot of flaws in the data.

According to the modulus theory passed from the West today, if the inner diameter of the artillery is a, then the thickness of the muzzle wall is 0.5a, the outer diameter of the muzzle is 2a, the wall thickness of the ear is 0.75a, and the thickness of the bottom diameter is 3a. The length should be more than 20 times the gun caliber.

Zhang Dudu designed the [-]-jin Hongyi cannon according to the Western modulus, but it exploded as soon as it was released, so the cannon wall had to be thickened.

The outer diameter of the actual designed gun has reached three times the inner diameter; the bottom diameter is close to four times the inner diameter, which is one of the reasons why the gun is too heavy.

However, judging from the results of Zhang Shun's experiment, the [-]-jin Hongyi cannon actually used insufficient materials in the key part of the medicine room, and used more materials in insignificant parts such as the barrel, resulting in excessive dead weight. .

Therefore, Zhang Shun's idea is very simple. After increasing the caliber of the ten-thousand-jin Hongyi cannon, it is only necessary to strengthen the medicine room of the cannon, which should be able to meet the requirements.

Thinking of this, Zhang asked by the way: "Where are the cracks in the shells of these artillery bombs?"

Dudu Zhang was full of displeasure, but he had nothing to do with his master.

He had no choice but to frown, and replied while thinking: "There are six doors... No, seven doors were blasted from the rear; three doors were blasted from the front, and one door was blasted from the middle!"

Oh? Although it is somewhat different from what I thought, it doesn't seem to affect the conclusion very much.

Zhang Shun thought for a while, and realized that other parts burst, probably because of the quality of the casting.

He then laughed and said: "Mr. Zhang, don't be bothered, first try to cast two gates with my method, if it really works, wouldn't it be wonderful?"

"If it doesn't work, it's never too late to do it again!"

"Okay!" Dudu Zhang cheered up after hearing this, and asked Zhang Shun for the size of the new cannon.

"First, cast a cylinder of pig iron, with a length of nine feet seven inches and a diameter of six inches and a half, as the standard."

"Then use a wrought iron bar half an inch thick and burn it red to wind it. Hammer until it reaches three points, make sure that the joints are forged as a whole. After the first layer is completed, the second layer is wound alternately, just like hammer forging!"

"The two layers are completed, and the wrought iron wall is about six cents thick by hammering. Then two more wraps are made at the back end, about a foot long, to strengthen the medicine chamber."

"Then take it out, put it into the mold, and use it as the gun core. Fill it with pig iron, and after the molten iron cools down, take it out for use!"

"The thickness of the muzzle is about one foot and four inches, the thickness of the wall at the ear is about one foot and seven inches, and the thickness of the gun tail is two feet and two inches. The overall weight is controlled to about [-] catties. What does Mr. Zhang think?"

"Is... the muzzle and ear of the gun a bit too thin?" Although Zhang Dudu disliked Zhang Shun's "blind command", he still raised his concerns in a responsible manner and based on his own experience. .

"It shouldn't be a problem!" Zhang Shun assured, patting his chest, "Before I made cannons in Shanxi, I didn't know how to do it, so I asked the craftsmen to try it in many ways. After verification, I learned that the power of gunpowder is all in the medicine chamber, the barrel, the cannon You can't bear the rest of your strength."

"If it is cast properly, not only will the cannon body be lighter, but the firepower will be even greater than that of the original cannon!"

Although Zhang Dudu still had some disbelief in his heart, he was so troubled by the "Optimus Prime" artillery in Shanxi back then, so he had to obey orders honestly.

Due to the repeated smelting of pig iron before, some of them have been decarburized into "wrought iron". Dudu Zhang divided the craftsmen into three parts.

Some are responsible for picking iron ore and smelting pig iron; some are responsible for making sand molds and preparing for casting; the other part is using the hydraulic forging hammer "invented" by Zhang Shun to beat wrought iron, and after the pig iron core is made, forge cannons bore.

There are difficulties in this:

For example, more than ten thousand catties of molten iron are needed to cast ten thousand catties of Hongyi cannon, but the crucible iron smelting method commonly used in Shanxi can only produce more than one hundred catties of crude iron at a time, which is not enough at all.

Zhang Dudu had no choice but to choose the blast furnace ironmaking method with slightly inferior iron quality, which can produce six or seven hundred catties of molten iron at a time.

Only seven or eight furnaces are smelted together, which is enough for one mold.

While making sand molds seems to be the simplest, how to fully mix sand and clay is also a big problem.

In this era, if there is no mixer, it is impossible to make so many qualified clay-sand mixtures at once.

Dudu Zhang ordered the craftsmen to mix it with small buckets, and inspect them one by one.

The mold was made, and it was difficult to use when it was wet, so we had to take wheat straw and put it into the mold, light it and dry it slowly with a low fire.

On the contrary, forging the wrought iron barrel is the easiest way, which is the most wasteful. Not only is there a hydraulic forging hammer as a booster, Zhang Shun's method of rolling wrought iron on the pig iron column is also simple and easy.

It's just that after the forging of the gun bore was completed, the pig iron column was wrapped in it, and eight cows couldn't pull it out.

How to do?Zhang Shun had no choice but to use the principle of thermal expansion and cold contraction to immerse the iron column wrapped inside in cold water, and heat the wrought iron barrel outside to separate the two.

Zhang Shun, Zhang Dudu and others worked together, spent half a month before and after, and finally cast the cannon.

"King Shun, please open the model!" Dudu Zhang respectfully asked for instructions.

"Okay!" Zhang Shun looked at the two big guys who were half buried in the ground in front of him, and nodded.

He was in the mood of playing games in his previous life, saving enough for a ten-game company, and preparing to draw cards.

Right or wrong, success or failure, in one fell swoop!

　For the artillery written in this chapter, the version designed by Zhang Dudu is based on the template of the ten-thousand-jin Hongyi cannon "General Yaowu" in the late Qing Dynasty, while the design of the protagonist is based on the British 68-pound naval gun.

　　According to the later casting theory, the weight of the cannon body should be about [-] times that of the shell.The cannon designed by the protagonist weighs [-] catties, which should be [-] catties by a factor of [-]. Due to technical limitations and the fact that the charge at the end of the Ming Dynasty was higher than that later, it was enlarged to [-] catties. As the protagonist's siege killer!
　　
　
(End of this chapter)