Chapter 137

The next day, the king of Wei and the mighty fleet left Qingzhou wharf.

Xiao Ming looked enviously at the fleet of the Wei king. He didn't know when his own Qingzhou City could have such a magnificent fleet.

In the shipbuilding workshop of Qingzhou, his Galen ships are still under intense construction. I only hope that by the end of the year, he can really get three Galen ships as Zhang Liang said.

At that time, the artillery will be placed on the Galen ship. In this era of sailing warships, he is also a step into the sea.

However, when he thought of artillery, he suddenly became big again. The number of artillery needed on the battlefield was also large, which was a heavy burden. So it seems that training a strong navy really needs to spend money on it.

After sending it to the king of Wei, Xiao Ming went directly to the equipment department.

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

Xiao Ming naturally won't take the detour that his predecessors have gone through. The casting method he used this time is the iron mold casting method, which has existed since ancient times.

But it was in the Qing Dynasty that it was used to cast artillery.

In fact, there is no technical difficulty in this method. Only the current craftsmen can't think of this method.

It's not technology, it's technology discovery.

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

"Now, your highness, we're making clay cannons." When Chen Qi sees Xiao Ming coming, she immediately comes over.

He didn't sleep well for days and nights because of the casting of artillery. He thought about the method Xiao Ming taught him day and night.

As Xiao Ming said, if the gun is built, Chen Qi will be famous in history.

But these days, he led the craftsmen to try to cast the gun, only to find that the manufacture of the gun is not so simple, now only the gun mold has failed several times.

Looking at the failed clay cannon, Xiao Ming said, "failed again?"

Chen Qi looked a little tired and ashamed. "Your Highness, at the beginning, the craftsman made this clay gun embryo. It always failed to shape. Now it's more skilled. I think it's almost done this time."

Xiao Ming nodded and looked at the craftsman who was making the clay cannon embryo.

According to the size of the iron gun, the clay gun should be made in 4-7 sections. Then, according to the number of sections of the clay gun, the clay model of the iron mold should be made. Each clay model should be divided into two parts. The inner surface of the iron mold should be made by turning the plate to make the surface smooth and the shape regular, and then it should be dried for use.

A prefabricated handle is put into the clay mold, which is integrated with the iron mold when pouring.

Next, when using the clay cast iron mold, first invert the muzzle section on the clay plate, fill one of the pieces with mud, after drying, cover the clay plate, clamp the mold tightly, and after pouring, one piece of the first section of the iron mold will be obtained.

After removing the filling mud, another iron mold can be cast in the same way. In this way, the whole set of iron mould can be cast by pouring section by section.

Finally, when casting the iron gun with the iron mold, first brush the inner surface of the mold with the coating made of fine rice husk ash and fine sand mud with water, and then brush the second layer of coating made of very fine coal powder, then tighten the iron mold, heat it, assemble the mud core, and pour in the molten iron. After solidification, the iron mold is removed immediately. When the gun body is still red hot, the burr and mud core are removed to obtain the finished gun.

However, this time, in order to reduce the burst rate of the gun, he planned to use the hollow ceramic core instead of the clay core, and inject water into the hollow ceramic core to cool the iron in the gun barrel.

This is also the basic method of barrel cooling technology. We only want to reduce the burst rate and produce high-quality iron guns.

The matter of extorting other vassal kings was handed over to Zhan Xingchang. Now Xiao Ming devoted himself to the equipment department, and Chen Qishi needed to produce the gun.

When the barbarians went south this time, they had to send out a large army to prevent them from conquering Cangzhou. They had to rely on the city's strong artillery to make the barbarians panic and retreat.

After all, his artillery is not the fire tube of Dayu kingdom. The range of three to four Li is enough for the barbarians to drink a pot.

As Chen Qi said, after a few days of failure, craftsmen have mastered some skills.

However, the artillery has not been cast, and this artillery casting specification has come out. Xiao Ming divided the artillery into 6 pounds, 9 pounds, 12 pounds, 18 pounds, 24 pounds, 32 pounds and 42 pounds.

This time, Xiao Ming's artillery was used to defend the city. Of course, he used heavy artillery, so he used 18 pound artillery, 32 pound artillery and 42 pound artillery, which were huge guns. There was no need at all. After all, 18 pound artillery was enough to be used as naval gun.

And the higher the pound, the bigger and heavier the gun body is. Handling itself is a problem.

In one day, according to the design standard of 18 pound cannon, the equipment department made half of the clay cannon embryo, and the rest can only be continued tomorrow.

The clay gun embryo is still cast iron mold, which means that it will take at least ten days to cast the gun.

It has been more than ten days since we got the news that the barbarians are going south. It is estimated that the first cannon will be produced in one month.At this time, it is estimated that the time for the barbarians to go south is only about five months, which is just his guess.

If the barbarians go south ahead of time, he will really be forced.

Because of this, he didn't dare to be idle during this period of time. He didn't dare to delay when he was busy. He went back to the palace at night and thought about how to granulate the powder.

As we all know, the greater the power of gunpowder, the greater the power of the gun.

Nowadays, the proportion of gunpowder in Dayu is not very accurate, but gunpowder is no secret.

It's easy to get the materials for gunpowder.

After dinner, Xiao Ming called Lu Tong over.

The gunpowder was a matter of chemistry. Naturally, it had to be handed over to Lu Tong. Green rose and aster also came to fight. Five people were lighting lanterns in the side hall of the palace.

In front of Xiao Ming, there are charcoal, saltpeter, sulfur and a small scale. While weighing three things, he orders the land passage: "grind these three things into powder. Be careful, they will explode."

Lu Tong's face turned white and his hand trembled. Since he studied chemistry with Xiao Ming, he realized that none of the chemical research objects could kill people.

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

However, when he thought of the barbarians going south, he was biting his teeth. This was a national hatred. In order to eliminate the barbarians, he would eat it raw, not to mention making gunpowder.

Looking at Lu Tong biting his teeth, Xiao Ming was afraid. He said, "be gentle. The finer the powder, the better. Don't use too much force. You want to kill me."

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