When the iron cannon mold was made, it was immediately handed over to the First Iron and Steel Works.

This initial division of functions is also the key to standardization and is indispensable in industrialization.

As for the iron mold casting method, this technology is the only leading military technology in our modern times.

Historically, this technology was invented by Gong Zhenlin, and it was thirty years ahead of the West.

According to the record evaluation: its method is simple, its use is the most convenient, a worker receives the benefits of hundreds of workers, and a cannon saves dozens of times the capital. And spin casting spin out, no delay day, flawless, natural smooth, twice the result with half the effort, the use of infinite, the guide track of the public theory, open the door of the eternal law, which is beneficial to the country's armed forces, is not shallow and fresh!

It's just that in the middle and late Qing Dynasty, this kind of achievement did not play a big role.

Because the overall scientific level has been backward, Gong Zhenlin invented the iron mold cast cannon, and the cannon made is not much different from the red-coated cannon at the end of the Ming Dynasty.

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"Son of God, the molten steel in the crucible has been made!"

"Let's get started!"

As Yan Zheng gave the order, the workers of the steel plant began to get busy immediately.

Wang Quan, as a newcomer to the First Iron and Steel Plant, could only stand on the sidelines with the students at this time.

He had only been in the steel mill for a few days, but he was already deeply shocked, and he even felt that as long as he learned this steelmaking kung fu, he would be able to go back to Daming to open an iron factory and become a rich man.

It's just that he can't figure out why a black pot and an iron melting furnace can directly train steel.

He had also seen what was added to the iron material, and he didn't feel anything magical.

After thinking about it, he thought that it might be the relationship with the small stove next to him, but in fact, he didn't know that it was just a heat storage chamber.

The real key is precisely the inconspicuous big black cauldron.

And as the iron mold began to be slowly poured into the molten steel, Wang Quan exclaimed in his heart.

He thought his little bit of craftsmanship was ridiculous compared to here.

Who would have thought that people don't use any clay molds, but directly use iron molds.

These craftsmen also cooperated tacitly, and as a pot of molten steel was injected, an iron mold was quickly filled.

After they filled one, they didn't stop, but quickly began to inject the second.

When the second one was full, it stopped sweating.

Yan Zheng looked at it from afar, pointed to these iron molds and said, "I told you last time that the iron molds dissipate heat faster, so the texture is harder!" The iron parts cast in this way will be stronger! ”

The students looked at it curiously, and in their eyes, it was a very rough and beautiful picture.

"Send them a few bowls of herbal tea!" Yan Zheng commanded.

Immediately, a few female students walked over with pots and cups, and filled them one by one for these hard-working workers.

This move made these workers look at Yan Zheng with gratitude.

The students looked at these workers with more respect.

When it was almost cool, the iron wood needle instructed the workers to crack open the hoops one by one.

Then he opened a petal, which, according to his understanding, cooled faster.

It's just that Yan Zheng in the distance couldn't help frowning.

He beckoned, and when the ironwood needle came, he said, "Only five of these two cannons will be made each, stop first!"

"Why? Isn't it smooth? Ironwood asked.

Yan Zheng sighed and said, "How can I explain it to you?" As soon as I remembered, the barrel needs an inward prestress, and this can be done in two ways, one is a silk tight tube, and the other is to have a prestress in the barrel itself! ”

Ironwood Needle looked confused, he almost didn't understand mechanics and artillery at all.

Yan Zheng thought about it for a while, and said in another way: "You should know that iron will also expand and contract in heat, but look! When we cast a cannon like this, the inner core is a clay inner mold, which is also the barrel of the cannon. ”

"I just thought that the internal side will be much slower than the external cooling, and with your experience, you should guess that the strength will be higher over there!"

"Outside, of course!" Ironwood needle said.

"That's right, so that if its prestress is not inward, the bore pressure that the cannon can withstand will drop!" Yan Zheng explained.

The iron wood needle was still a little incomprehensible, but he understood that Yan Zheng wanted to make the inner side stronger.

Yan Zheng also saw the process of casting the cannon, so he reacted instantly.

"Use an iron inner mold, if the middle is hollow, you can add water to it!" He immediately clapped his head.

Tiemu Needle thought for a while and said, "I'll let people go to the mold manufacturer to measure it!"

"Call the woodworking shop too! There are also potters, who deal with different cooling rates inside and outside and also have some experience. Talk about your experience together, and come up with a plan when the time comes, and if it doesn't work, use the original method, but the technical assumption I said is right, you have to keep trying! ”

Tiemu nodded and immediately ran to execute.

Wang Quan stood aside and watched, and his heart was shocked.

Although he couldn't understand what they were saying, he could see that the Short-Haired King was not satisfied.

He thought to himself, this is not satisfied? This short hair is too hard to serve!

But as a blacksmith, he can be regarded as an eye-opener today!

As a literate Ming descendant, thinking of the slogans on the city wall, he naturally couldn't help but ask in his heart, can this group of people really be enemies of the Ming Dynasty?

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After a full day of cooling, the first cannon of both types of cannons was simply bored and declared fresh.

The rear-loading smoothbore gun is 1.2 meters long, 16 times the diameter, and weighs more than 300 catties, and after adding the gun carriage, it is estimated that it is more than 400 catties.

Yan Zheng named it the rear-loading -75 smoothbore gun, and the alias was the rear door gun.

Front-loading smoothbore gun, the gun body is 1.65 meters long, 22 times the diameter, weighs more than 500 catties, Yan Zheng named it the front-loading -75 smoothbore gun, alias Yan Huang three-jin gun.

The main reason for choosing such a naming method is to make it easier for soldiers to understand, and when they hear the name, they will know the performance of this gun.

At the same time, after defining the two methods of smoothbore and rear loading, it also provided two ideas for the technology of making artillery later.

That is to say, in the future, if Chief Yan can't live forever, then listening to this naming, future generations will think of possible improvement routes.

"Arquebus?"

When Yan Zheng was preparing to test the artillery, many soldiers expressed such feelings.

Many of them had already touched the arquebus, and looking at this big black guy, they naturally pulled on it.

Yan Zheng asked people to weigh five catties of gunpowder, and the amount of gunpowder he loaded was 60% heavier than that of a shell.

The distance at which the shell is fired is related to the amount of gunpowder charged and the angle at which the muzzle is tilted.

There is only one degree, because the gunpowder does work, no matter how high the efficiency is, it depends on the length of the barrel, and the ideal state is that when the shell reaches the muzzle, the gunpowder is just finished.

Since this possibility cannot be achieved, a little more gunpowder is often filled.

Therefore, there is a degree of gunpowder loading, and beyond this degree, no matter how much it is loaded, it will only attract explosions, and it will not allow the shells to do their work and climb.

After stuffing the gunpowder, Yan Zheng stuffed a round lead bullet into it, and then poured some gunpowder on the ignition port.

Also running far, use a hemp rope to complete the ignition.

"Ten, Nine, Eight, Seven......"

As the countdown began, the people who came to visit stretched their necks one after another.

"Three, two, one, ignition!"

At the end of the countdown, Yan Zheng pulled the hemp rope.

A moment later, only a burst of fire flashed in the distance, and a loud bang resounded through the sky.

Under the smoke of gunpowder, many people were frightened and fell to the ground.

In the distant forest, there were panicked cries of various birds.

When the smoke cleared, Yan Zheng walked to the front gun and found that the recoil had destroyed the improvised fixture.

The crater smashed by the buckshot was finally found by the tribesmen at a distance of about 1,900 paces, or about 1,500 meters according to the distance.

The effective range is about 900 to 1,000 meters.

This kind of power has surpassed the Hongyi cannon imitated by the Ming Dynasty in another time and space, and has also reached the level of Napoleon's three-pounder cannon, and the weight is half lighter than the bronze Napoleonic cannon.

Moreover, this test gun is relatively rough, and the amount and quality of gunpowder seem to have some room for improvement.

It's just that the airtightness of the rear-loading gun is not good, the firing range is only 900 meters, and the effective firing range is about 400 meters.

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