Yang Gan hammered his chest and said with a disgusting look on his face, "It's been almost three years since I've been here. Do you know how I spent the past three years."

Zhang Yumeng blinked and said, "Hosh, elbow, Dongpo pork, bathing, soaking feet, three warmth?"

"Get out of here~~!"

Zhang Yumeng smiled and immediately pointed out the next problem.

"Then how do you calculate the metal ratio?"

Yang Gan thought about it and took out the information from the bookshelf and read it.

"Five points of gold and tin are two, which is called the equality of the arrows of the cut, that is, copper, the ratio of tin is five to two, that is, copper accounts for 71.43% and tin accounts for 28.57%.

"I am a person with obsessive-compulsive disorder, and it is directly 70% bronze and 30% nickel. What do you think?"

Zhang Yumeng calculated carefully and couldn't help but widen her eyes, "Damn, you guy is really bad, I'll tell you clearly, these days, everyone's money in their hands is calculated based on the content and weight of bronze. Don't It'll be screwed up then."

"And, the ratio you just mentioned is bronze, is it good? In this way, there is not even 50% of copper, is it OK?"

Yang Gan was silent for a while and had some thoughts in his heart. What Zhang Yumeng said really makes sense, but he was very unwilling to accept it and asked hurriedly.

So what will the color difference be if done like this?

"Of course there will be, the color will definitely be very light, and it may turn white."

Yang Gan's mouth twitched hard, I'm afraid it won't work.

At this time, Mu Qing said, what is the purpose of minting coins? If it is to make money, then follow Yang Gan's method.

If it is for the convenience of transactions and unified currency, it should be done from a safe perspective.

Zhang Yumeng smiled and said, "It's actually very simple. Just add 10% nickel to achieve the purpose of wear resistance and beauty. It will look very beautiful, but adding too much will be bad."

After saying that, she began to write and draw on the plan.

"You see, if it is bronze and nickel, 90% bronze and 10% nickel will have the best effect and will not destroy the market."

"When will the bronze disappear and be cast by yourself, 65% pure copper, 25% tin, and 10% nickel can achieve the same goal."

After thinking about it for a while, Yang Gan still adopted Zhang Yumeng's opinion.

"I'll ask you in terms of craftsmanship."

Yang Gan looked casual and spoke quickly, but Zhang Yumeng was not a fool, so she asked immediately.

"What craftsmanship? Please let me know? Explain it clearly~~!"

Yang Gan said naturally, "We must use modern coin minting methods. With the current coin minting technology, I am afraid that it is not efficient enough."

"really!"

Zhang Yumeng's face was full of depression. She felt that this guy was not asking him to participate, but putting a trap on himself.

However, after getting on the pirate ship, I can't get off for the time being, so I first see what I was asking me to do.

"Then I have to know how the coins are minted now, let's see how to adjust them."

Yang Gan called Ou Yexia over with a phone call.

He came over and didn't know what the young master was looking for him.

"Young Master, do you have any big orders?"

Yang Gan said lightly, "I have obtained the right to mint coins."

"Puff~~~!"

Ou Yexia squirted out a mouthful of water and looked at Yang Gan foolishly.

"The right to mint coins? The right to mint coins!!!"

"Young Master, what you mean is that we can legally mint coins? Wouldn't that be developed!!!"

Yang Gan smiled and said, "What is it? This is a matter that benefits the country and the people, not me alone. If I were to make a fortune, I would have minted private coins long ago. With my current status, would anyone still find it. Am I in trouble?"

When Ou Yexia thought about it, she immediately touched her beard. After doing it seriously, she asked, "What can I do?"

"Will you mint coins?"

Yang Gan asked the most critical question.

Ou Yexia smiled and said, "Although I haven't cast it, the craftsmanship is not difficult. My mentor has cast coins before, so I can do it too."

"Tell me, look."

Ou Yexia nodded and began to introduce.

It turns out that coins in this era require money style, that is, molds.

Now we use pottery model, which consists of native soil, clinker, and charcoal ash, and mix the three with water in a certain proportion.

After the mud is over and over, it can be used to make money models. The cavity and gate of coins are carved one by one on the money models. After the two money models are combined, they can be used for pouring.

It's simple, and Zhang Yumeng immediately heard the shortcomings.

This type of engraving process is time-consuming and labor-intensive, inefficient, and the characters of engraving coins vary greatly. Unless it is in a currency pattern, the details of the coins produced will be very different.

After finishing the entire process, Yang Gan was also a heartless person and directly asked Ou Yexia to go back. After Mu Qing's reminder, he was kept to eat for feeding. He didn't want to feed, but forgot.

When eating and feeding, Yang Gan was thinking about things in his head, and he didn't even taste the food.

After eating and feeding, they couldn't wait to rest, the two began to discuss fiercely again.

Zhang Yumeng thinks it is easier to make molds with good materials.

But Yang Gan didn't think so, and he had higher requirements.

"Zhang Yumeng, there is a hardware factory near my hometown. I almost grew up listening to the sound of those machines. I don't feel complicated if you can get those machines out."

Zhang Yumeng glanced at him and sneered, "You don't even know any machine, and you still want me to build it?"

Yang Gan showed a memory and said, "I was still young at that time. I went to that small factory to play. The machine was not very big. Every time I smashed it down, a part would fall off the steel plate, which was very convenient."

"Oh~~ I get it, you're talking about a stamping machine, right?"

"Pressing machine? Then I don't know. Anyway, the thing is constantly pressing on the steel plate, and parts come out in a specific way. I feel it is super convenient and very fast."

Zhang Yumeng shook her head. Yang Gan likes to use mechanized things, but she doesn't even know what the machine is.

Then according to mechanization, large ones will definitely not be able to withstand it. There is no stable voltage and current. Don’t even think about these super-large equipment.

Zhang Yumeng started writing and painting, and then discussed with Yang Gan that after all, he had never cast coins himself. If he had ever cast coins in his previous life, it would be a torture.

According to the process, it is not difficult to make copper-tin-nickel alloy into a plate, but the difficulty is how to make this thing the same thickness.

After all, Zhang Yumeng didn't rely on making a living, so she was stuck.

Yang Gan reminded that he knew there was a kind of machine, that is, two rollers rotated at the same time, and the board would be flattened out when it passed by. If it was too thick, you could design a few clips, tighten each time, so that one piece and one centimeter. A tall sheet will become the desired thickness and the area will become larger.

Zhang Yumeng immediately reported that this was a steel rolling mill. After the idea was clear, we would take the next step.

If you have the board, you need the machine mentioned by Yang Gan. He can't call it, but Zhang Yumeng knew that the machine was called a stamping machine.

After installing the mold, you can directly stamp out the shape according to the mold.

Once you have a round coin, you will print out the font, which is also done by using a stamping machine.

Complete the process.

First: Smelting copper, tin, nickel metal to make rough plates.

Step 2: Use a steel rolling mill to roll the palm-sized plate to the thickness you need.

Step 3: Use a stamper to stamp out the required round square hole coins.

Step 4: Use steel sand to roll inside the drum to remove burrs.

In these four steps, the coins that come out are theoretically bronze, shining brightly, corrosion-resistant, friction-resistant, and high hardness. Even if they are only one millimeter thick, it is very difficult to pinch the bend after making the coins. .

Those who are not human do not count.

Yang Gan looked at Zhang Yumeng who was silent and asked, "Can you make that rolling mill and stamping machine?"

Zhang Yumeng smiled and said, "Yes, I can still build a nuclear bomb."

"Damn it, you're so awesome, you didn't joke with me."

"That's what you joked with me first."

After untiing his hair, Zhang Yumeng kept holding on to his hair, looking extremely irritable.

"By the way, I can actually help you."

"You?"

Yang Gan said sincerely, "Of course, once this thing comes out, commerce will naturally become more prosperous, which is a good thing for us."

Zhang Yumeng counted with her fingers and said, "You can't draw pictures, you don't understand physics, and you don't understand machinery."

Suddenly she came back to her senses, frowned and said, "Hey, I can't figure it out. You don't usually contact these machines, how can you know them?"

Yang Gan was helpless and spread his hands, "Isn't this a girlfriend without a girlfriend? I'm watching videos every day, watching others fishing, repairing donkey hoofs, making knife competitions, opening warehouses, etc."

“Awesome~~~!”
To be continued...