Chapter Seventy-Five: Tools

Shi Da turned over and was embarrassed: "When you meet the little master, you will have a festival, how embarrassing it is to always be like this." What do you need during this time, just mention it, and the vegetables and vegetables are packed for the children in the village! Young master, you really don't want to go back with me? ”

Su You said: "It's good here, you can come early tomorrow." ”

After a day of hustle and bustle, Su You finally quieted down, Su You found a clay pot, loaded briquettes, covered it with sand, put it on a charcoal fire and simmered it, ready to smelt coke for later use.

Lying on the simple low bamboo bed, smelling Chen Ai who was tied to the burn, Su You looked at the dark and dreary roof.

Su Xiaomei was very happy, leaned over and said, "Brother Xiaoyou, it's the first time you've spent the night with us." ”

Su You smiled: "Actually, I like this kind of day, everything starts from scratch, and we use our own hands to make life slowly better, and we are comfortable and have a sense of achievement, right?" ”

Su Xiaomei's eyes were shining: "Are all adults like this?" And then when the days are good, they will get to know each other, get married, and have new children? ”

Su You sighed: "Little sister, don't think too simply, there are many other people in this world." ”

"Some people think that you are self-reliant and that they are well managed; Some are insatiable and want to take the wealth created by others for themselves; What's more, just like we used to, there is no cone on the top and no cone under the bottom, there is no thinking and no skill, just like duckweed in the water, staggering to survive on weekdays, and even relying on the state to support it, and the slightest turmoil is a disaster that covers the top......"

"That's because they didn't meet their brother."

"Actually, no, these people are all part of the country, and there are many such people, which can only show that our country is sick ......"

"Then wait for my brother to grow up and cure it!"

"Me? You think too much, I'm just one of the people who are managed, and my power is very limited. ”

"Brother is not afraid, you still have us! Then when we're all grown up, let's go and heal it together! ”

Su You was finally amused: "Hahaha, okay then, when we all grow up, when there are more and more people like us, let's all go and cure it together!" ”

The next morning, Shi Da came again and brought a few sets of pulleys.

The porcelain wheel used for the pulley is clamped into the green oka wooden board by an iron shaft, and the strength is not to be said.

Su You instructed everyone to first disassemble the upper layer of a bamboo raft and pave the slide.

The slide is divided into two sections, one from the water's edge to the woods by the land temple, and one from the woods to the timber yard planned by Suyou.

Then Su You began to give a lesson: "We have already talked about the principle of leverage, and we know why it can save power, today we will talk about a more advanced application of this principle, pulleys and pulley sets ......"

"Look, Uncle Shi sent us two sets of pulleys, how do we assemble them into pulleys now......

"Now we're experimenting...... You see, we pour water into this jar, and when the water in this jar reaches a certain weight, the rope lifts the jar full of water on the ground through a pulley set......"

"Look, the jar has been slowly lifted, and now let's compare it, how much ...... difference is the water on both sides?"

"Let's talk about the error problem, you see, through calculation, theoretically, only a quarter of the jar of water can be lifted to a jar of water, right? But why didn't it turn out that way? ”

“…… Yes, the fourth brother is right, the weight of the jar itself is ignored by us, how to eliminate this error? Brother Seven, ...... you?"

"Excellent! We only need to hang two empty jars first, and then fill the jar on the ground with stones, and load the whole pulley set to keep it just right, so that the weight of the two jars is neutralized, and then add water, and test it with the weight of water, which is more accurate......"

"Everyone understands? Next, we put the test findings into practice and sent all the big pine trees in the water to the wood yard to pile them up! ”

Next, we will explain the principle of sliding friction, and discuss how to reduce sliding friction.

Then let's go down to the equation series, calculate how to stack the pine wood into several stacks, and if it is divided into three piles and stacked into triangles, how many pieces of wood should be in the bottom layer.

After that, it was how to design a crane on the blackboard to facilitate the delivery of wood according to the principle of levers.

After all the designs were completed, everyone began to work.

A few older children nailed large grasping nails to the pine wood, and then hung the big hook under the pulley box, and a few children giggled and pulled the rope next to the fixed pulley box, and easily pulled the big pine wood up the river along the chute.

Then he switched to another set of pulleys, pulled along the bamboo slide on the ground, pulled to a slope in Kiba, and then pushed down from the other side of the slope.

There were several wooden wedges nailed to the ground, and the pine rolled to a stop there.

Then the pine wood is stacked layer by layer, the high-rise ones have to use a crane, that is, the big pine wood as a lever, one end is a strong big basket, after the pine is tied, the stone is put into the big basket, and the weight of the pine is gradually offset by piece, and then through the traction control, the pine is lifted to the upper layer and placed.

Shi Da looked stupid: "Such a large river beach, you can place it casually, the little young master is a toss." ”

Su You said with a smile: "This is also an experimental process of learning engineering knowledge, and besides, it is much better to stack it neatly than to throw it all over the river beach, isn't it?" ”

In the afternoon, Su You took out the coke made in the pottery kiln, distributed it to the children to grind the powder, and then mixed it with iron sand, loaded it into a graphite crucible, and used the laboratory method to make iron.

Small output, high precision.

However, he can only be responsible for the proportion, and he lives to do it.

The main components of Meishan iron sand are pure iron oxide and manganese oxide, so it can be reduced by a simple reduction reaction.

It is impossible to achieve real vacuum powder metallurgy, but through the replenishment of toner and the control of the high-reduction environment in the pottery kiln, the iron and high-carbon steel obtained are more accurately proportioned than those made by Shi Da.

It didn't take long for the high-carbon molten steel to be smelted.

After that, the highly reducing environment in the furnace is turned into an oxidizing environment through blasting, and the molten steel is decarburized to obtain molten iron.

Then mix low-carbon molten iron and high-carbon molten steel to adjust the proportion of carbon content in molten iron to obtain the most suitable steel.

This method has been mastered by the Song Dynasty, which is the principle of the steel filling method, but the steel filling method is to directly add the molten steel to the iron sand, which is not so fine.

Finally, the molten steel is poured into the sand mold to obtain the iron casting.

After an afternoon of tossing, Su You got some spearheads.

The advantage of high manganese steel is that even castings can be extremely hard if they are properly heat-treated.

The next step is heat treatment, which first makes the iron soft and easy to polish by normalizing; After grinding, it is quenched by covering soil to obtain hard steel; Then, through tempering, a part of the hardness is continued to be sacrificed to reduce the brittleness of the iron; Finally, it was refined and refined, and a few blades were obtained.

General Shi watched the trick for a whole day: "Awesome little young master!" ”

Su You said with a smile: "There are no forging conditions, it can only be like this, I don't know when it will be messed up, so I will prepare a few things for self-defense first." That's it today, tomorrow we'll make a file and make a knife! ”

In the next two days, Su You practiced coke at night, and during the day, he pulled Li Lianzhu and Xiao Qige around the refining furnace and made a lot of things.

The plate file only requires hardness, but it is the simplest, and the high-carbon steel takes advantage of the red heat to pull out the cross fine lines with an oblique knife, and it can be obtained after quenching.

The rest of the clumsy guys, such as hammers, axes, pliers, drills, and all sorts of woodworking tools, were also brought out.

The finest of these is the saw disc of a circular saw.

In order to make the steel of the saw disc more uniform when casting, Su You used up the beeswax stored in the land temple and made it out through the lost wax method.

Let Shi Da send a few roller bearings, clamp the wooden rods through the bearings, turn them close to them with knives, and turn out the wooden shafts with high roundness.

Wooden shafts, wooden plywood, dowels, circular saw blades, bearings, and cast iron flywheels, plus work surfaces, guides, and wooden scales are then assembled to form a carpentry table.

Using the principle of belt transmission, the bearing is connected to a big wheel, and through the thick rope transmission, a child goes up and pedals the big wheel like a bicycle, and the saw blade on the bearing is driven to rotate rapidly.

The guide rail can be disassembled and adjusted, which can be used for cutting at equal distances, and can also be used to change the board not more than the width of the radius of the saw blade.