The key points of the molding sand pouring method are the mold manufacturing, pouring speed, and furnace temperature.

On the banks of the White River, in the former barren grass beach, one-man high furnaces have been built.

Iron ore and coke were layered in a lit furnace and covered with a clay lid.

The huge foot blower blows air into the stove with a "whoosh, whoosh".

Zhu Cijiong stood with his hands in his hands, the big coat on his body had already been removed, and the craftsmen who were busy by the stove were wearing sleeveless single clothes - the stove was as high as more than 1,000 degrees, even if it was a cold winter, it was also hot.

Li Tingran stood on Zhu Cijiong's side: "Your Highness, if the method of making steel here is completed, it will save a lot of effort!" ”

Zhu Cijiong nodded, but sighed: "It's a pity that I can't find a craftsman who can fry steel, and the casting is still a pig iron cannon ......."

As early as the middle of the Ming Dynasty, the cast cannon was changed from a copper cannon to an iron cannon.

Because the cast pig iron is fragile, it is easy to blow up the chamber and the like.

Of course, although the level of cannon casting in this era cannot be compared with the Wanli Dynasty, it has not reached the point of the world joke of the late Qing Dynasty.

After the great Nicholas Seal Maniac, the genius young poet of the Qing court, the forty years of the four and one duck, the real playboy, the infatuated lover, the harvester, and the Qianlong Siku destroyed the book, Huaxia's science and technology plummeted.

So far, countless Chinese black technologies have been completely lost - such as the steel frying method.

As early as the Western Han Dynasty, the industrious Han people invented the method of frying steel, which could directly turn the molten iron out of the furnace into wrought iron, and then after beating it again, the steel was obtained.

This method predates Auman Bar by more than 1,000 years!

The frying method was used internationally until about 1930, and in China, it was used until 50 years ago.

……

Regarding Zhu Cijiong's complaints, Zhang Siyuan pretended not to hear them.

Your Highness, no matter what you do, you must pursue beyond the present!

For example, their spinning workshop, now the new machine, can produce 24 cotton yarns at the same time!

One machine, one worker, equivalent to six times the number of workshops in Jiangsu and Zhejiang under the control of the Manchu Qing Dynasty!

That's six times that!

It is six times that of the most advanced spinning workshop in Jiangsu and Zhejiang regions leading the country!

That's 24 times more than the one spinning machine they used before!

"Your Highness, all the cannons in the world are made by smelting pig iron first, then transporting the pig iron to the workshop, and then melting it before melting the artillery."

Zhang Siyuan chuckled: "We directly omitted a smelting step, but it is a pioneering act, and history will definitely remember this moment!" ”

Zhu Cijiong shook his head, he pointed to the north: "Do you know that over there in Beiguan is the steelmaking site of the Han Dynasty, and the ancients nearly two thousand years ago were able to directly smelt steel, and we ...... it."

Dengzhou and Fangcheng under the jurisdiction of Nanyang have a much earlier history than Nanyang County.

Nanyang did not begin to become a major city until the Han Dynasty, and it was a city that flourished because of iron smelting.

Prior to this, whether it was Dengzhou or Fangcheng, it was more important than Nanyang.

Nanyang not only has the ruins of the mines of the Han Dynasty, but also the ruins of steelmaking!

……

While the two were talking, Wu Dazhui on the other side of the furnace suddenly cheered: "Okay, the molten iron has been boiled out!" ”

With a sledgehammer in his hand, he smashed open the discharge port at the bottom of the blast furnace.

The dazzling white molten iron flowed out of the pottery pipe, and then flowed down the fork into the mold pouring port placed in the hole in the ground.

"Control the speed, the speed of the mouth must be controlled, pouring large and thick pieces, the speed of pouring must not be fast, otherwise a cavity will be formed!"

Wu Da Hammer was born in a craftsman's workshop, and the casting of the Furlong machine was a piece of cake for him.

Zhu Cijiong and the three of them held their mouths, slowed down their breathing, and watched intently.

If there is no problem with Wu's sledgehammer method, then under batch pouring, the number of cannons will not be a problem at all!

……

After half a pillar of incense, Wu Dazhui yelled: "Okay! Close the gates! ”

Ding Wei clamped a hollow pottery plug with a clamp and carefully blocked the discharge port.

Wu Dazhui dropped the tools in his hand, stepped forward to check carefully, and walked in front of Zhu Cijiong:

"Your Highness, of the five molds that have been made, it is estimated that two of them have been scrapped."

His face was full of embarrassment, and his heart was even more apprehensive.

This type of sand casting method, Wu Da Hammer has been practiced more than a dozen times, if you do it yourself, you can ensure the success rate of eighty percent.

His Royal Highness asked him to bring his apprentices, and the scrapping rate is probably a little higher......

"It's okay!"

Zhu Cijiong said with a smile: "The furnace is on the edge of the workshop, and it is scrapped, so throw it in and smelt it again." ”

Hearing that Zhu Cijiong didn't accuse him, Wu Dazhui breathed a sigh of relief: "Your Highness, this molding sand casting method is fast and fast, but the manufacture of molds requires experience." ”

In the molding sand manufacturing method, you need to carve the real thing with tin or hard wood, and then place it in a special mold, fill it with molding sand mixed with cement, and after compaction, carefully separate the upper and lower molds, so that you can take out the model inside.

Zhu Cijiong uses a cannon model carved from jujube wood, which is the most sturdy and wear-resistant.

As for the hollow gun chamber, it is placed in the mold with a screw-shaped skeleton and wrapped with molding sand.

Then the mold is stacked up and down, and the wedge that was deliberately left before is pulled out, leaving the exhaust hole, and then it can be poured.

Everyone waited for a while, Wu Dazhui reached out and touched the temperature of the mold, and pointed to a few apprentices: "Remember this temperature, this is ready to open the mold!" ”

After he finished speaking, he opened the mold with his own tools.

I saw a big black guy wrapped in a layer of semi-pottery-like hard shell, appear in front of everyone.

Wu Da Hammer was not too hot, he picked up a small hammer and began to peel off the hard shell of the outer layer of the cannon.

Not long after, a black three-foot-long cannon appeared in front of everyone.

I saw that this artillery had a big belly, a long body, and a thin wall, and on the barrel, two aiming crosshairs were set up in front and back.

After the tilt, the other four cannons were also stripped of the clay, and sure enough, as Wu Dazhui said, two of the cannons were destroyed.

Three black cannons appeared in front of everyone.

"Congratulations to Your Highness, the method of casting cannons has been completed!" Li Tingran's face was overjoyed, and he bent down to congratulate him.

"Congratulations to Your Highness, the method of cannon casting has been completed!" Zhang Siyuan and others also bent down to pay respects.

They witnessed a miracle with their own eyes.

It's just twenty people, and in one morning, three cannons were made.

Although it took time to sharpen cannon samples, build blast furnaces, and make molds before, these things can be regarded as once and for all!

Even, if they build a blast furnace on a large scale, make more molds, and make hundreds of artillery pieces in one morning, it is not impossible!