The next day, the King of Wei and his mighty fleet left Qingzhou Wharf.

Xiao Ming looked at the King of Wei's fleet with some envy, and I don't know when his Qingzhou City could have such a majestic fleet.

In the shipbuilding workshop in Qingzhou, his Garen ship is still under intense construction. I just hope that at the end of the year, as Zhang Liang said, he can get three Garen warships.

Then, the cannon will be placed on the Garen ship, and in this era of sailing warships, he will also take a step into the sea.

However, when he thought of the artillery, he suddenly became very angry. The number of artillery needed on the battlefield is also quite large, and it is a heavy burden. In this way, training a powerful navy really requires constantly spending money in it.

After sending the King of Wei, Xiao Ming went directly to the Equipment Department.

At this time, Chen Qi was taking craftsmen to cast iron molds, and the technology library in his mind was full of artillery casting methods.

Xiao Ming naturally would not take the detours he had taken before. The method of casting cannons he used this time was the iron mold casting cannon method. This method of casting iron mold has actually existed in ancient times.

However, it was used to cast artillery in the Qing Dynasty.

This method is actually not technically difficult, and only craftsmen today cannot think of this method.

Sometimes it is rare to be technology, but discovery technology.

Now Xiao Ming has taught Chen Qi and others the complete iron mold casting technique. For these skilled craftsmen, it is only a matter of time to master the iron mold casting technique.

"Your Highness, we are now making mud cannon embryos." Chen Qi saw Xiao Ming coming and immediately walked over.

This time, the casting of artillery made him not sleep well for several days and nights, and he thought about the methods Xiao Ming taught him day and night.

The weapon Xiao Ming mentioned made him even more excited. As Xiao Ming said, if the cannon was built, he would be worthy of being left in history.

But these days he led the craftsmen to try to cast artillery only realized that the manufacturing of this artillery was not that simple. Now this artillery model has failed several times.

Looking at the failed mud cannon embryo on the ground, Xiao Ming said: "Failed again?"

Chen Qi looked a little tired and looked ashamed, "Your Highness, at the beginning, the craftsman was born, and this mud cannon embryo always failed to shape. Now he is more skilled, and I think it's almost done this time."

Xiao Ming nodded and looked at the craftsman who was making mud cannon embryos.

This iron mold cast gun must first be divided into 4-7 sections according to the size of the iron cannon, and then make the mud cannon according to the number of mud cannon sections. Each section of the mud cannon is divided into two petals, and the inner surface is rotated with a car plate to make the surface smooth and the shape is regular, and then dry and set aside.

Prefabricated handles are placed in the mud shape, and they are cast together with the iron mold when pouring.

Then when using a mud cast iron mold, first put the section of the mud inverted on the mud flat plate, fill one of the petals with mud, dry it, cover it with mud flat plate, tighten the shape, and after pouring, you will get a petal of the first iron mold.

Then remove the mud and cast another iron mold as shown in the method. In this way, pouring section by section can be made into a complete set of iron molds with layers of mortise and bonding.

Finally, when casting an iron cannon with an iron mold, first brush the inner surface of the mold with fine rice husk ash and fine sand mud and water, then apply the second layer of paint made of extremely fine coal powder, then tighten the iron mold, dry it, assemble the mud core, and pour it in water. After solidification, remove the iron mold immediately. When the gun body is still red and hot, remove the burrs and remove the mud core to obtain the finished cannon.

However, in order to reduce the blow rate of the cannon this time, he planned to use a hollow ceramic core instead of the mud core, and pour water into the hollow ceramic core to cool the iron in the barrel.

This is also a native method of gun barrel cooling technology, which only requires the reduction of the blow-off rate and produce high-quality iron cannons.

The matter of extorting other vassal kings was handed over to Zhan Xingchang. Now Xiao Ming has devoted himself to the Equipment Department, and Chen Qi must produce the cannon.

This time the barbarians went south and would inevitably have a large army to stop the barbarians from conquering Cangzhou. They could only rely on the city's strong and powerful artillery to make the barbarians panic and retreat unexpectedly.

After all, his artillery is not the fire tube of the Great Yu Kingdom, and the range of three to four miles is enough to make the barbarians drink a pot.

As Chen Qi said, after the failure a few days ago, the craftsman has mastered some skills.

However, the cannon has not been cast, and the specifications for casting of this cannon have been released. Xiao Ming divided the cannon into 6 pounds, 9 pounds, 12 pounds, 18 pounds, 24 pounds, 32 pounds, and 42 pounds cannons.

This time, Xiao Ming's cannon was used to defend the city, so he naturally had to use heavy cannons, so he used eighteen-pound cannons. The 32-pound cannon nuclear and 42-pound cannons are giant cannons, and there is no need for them. After all, the 18-pound cannon is enough to be used as a naval cannon.

Moreover, the higher the pounds, the bigger the cannon body, and the heavier it is, and handling itself is a problem.

In one day, according to the design standards of the eighteen-pound cannon, the Equipment Department made half of the mud cannon embryo, and the rest could only continue tomorrow.

The mud cannon embryo is still casting an iron mold, and it will take at least ten days to cast the cannon.

It has been more than ten days since we got the news that the barbarians went south. It is estimated that the first cannon will be produced in one month.

At this time, it was estimated that the barbarians had moved south only about five months, which was just his guess.

If the barbarians went south early, he would be really miserable.

Because of this, he did not dare to be idle during this period. After finishing his work, he did not dare to delay. He returned to the royal palace at night and thought about how to pelletize gunpowder.

As we all know, the greater the power of gunpowder, the greater the power of this cannon.

Nowadays, the ratio of gunpowder in the Great Yu Kingdom is not very accurate in all aspects, but gunpowder is no longer a secret.

This material for producing gunpowder is also easy to obtain.

After returning from the Equipment Department, after dinner, Xiao Ming called Lu Tong over.

This gunpowder is a chemical matter, so it is naturally left to Lu Tong. Lu Luo and Aster also came to help. The five of them were lit with lanterns around the side hall of the royal palace.

There were charcoal, saltpeter, sulfur, and a small scale in front of Xiao Ming. While weighing the weight of the three things, he ordered Lu Tong: "Crush these three things into powder, and be careful, it will explode."

Lu Tong's face turned pale, and his hands couldn't help but tremble. Since he learned chemistry from Xiao Ming, he realized that none of the things studied chemistry could kill people.

Now Xiao Ming asked him to make a powerful thing like gunpowder, which puts a lot of pressure on him.

However, when he thought of the barbarians going south, he gritted his teeth and held his feet. This was the national hatred and family hatred. In order to eliminate the barbarians, he would not say that he would make gunpowder, even if he had eaten it raw.

Looking at Lu Tong gritting his teeth, looking like he couldn't get along with the gunpowder material, Xiao Ming was afraid. He said, "Be gentle, the finer the powder, the better. Don't use too much force, do you want to kill me."
Chapter completed!