After screening, the balls with qualified dimensions can not be used, because their hardness is not enough after tempering, and they must be quenched again to increase the hardness.

This quenching is the key to whether the ball bearing can be used, no matter how perfect the previous process is, the balls are the same size as the circle measured by the laser. But it can't reach the hardness, and it is useless to put it in the bearing, and after the load, it can't turn many times and the skin will fall off.

How much lime, how much soda ash, and how much charcoal powder are used, are all proportional. There is also corresponding data on how much the temperature of the carburizing chamber is and how long it is maintained.

Yes, this quenching method is also called surface carburizing and hardening, but compared to armor, the carburized layer of the ball is thicker, and it is best to completely penetrate the center.

Such balls are rather broken than flattened, and will not wear out the bearing because of excessive deformation, and once it can't bear the pressure, it will be broken with a click.

This set of processes is quite complicated, Hong Tao rolled his eyes, pouted and said: Complicated? Damn, I'm only halfway there!

Yes, the balls have been processed, and the inner and outer snares of the bearings still have to be treated. White iron is hard enough, but it is too brittle and easy to break. What to do? Make a smoldering oven to roast like roast duck, the temperature is enough, the holding time is enough, and the cooling speed is controlled, these white cast iron will become black cast iron, also called gray cast iron.

Its hardness has not decreased much, but its toughness and machinability are much better. This duck-like method is also the basis for metal heat treatment, which is called spheroidized annealing.

Magically, one cold and one hot, one burning and one roasting, water-based, oil-based with salt baths, Hong Tao is like magic, through the seemingly simple, but actually summarized hundreds of years of technology, these steel turned over and kneaded.

If you are soft, you have to kneel down immediately, if you wear cotton pants hard, you have to poke a hole, and if you are soft and hard...... This posture is too difficult to describe, and it can only be understood.

This kind of ball bearing is more primitive, only the groove in the middle of the inner and outer bearings can only limit the left and right movement of the ball, and can not prevent the beads from squeezing together.

What to do? It is also necessary to use a thin iron sheet to make a retainer to separate the balls from each other, which will not affect the rotation of the balls. This kind of thing also has a common name very vivid, called flower shelf!

The reason why I remembered to make ball bearings was not because Hong Tao had a whim, or because of the pain of idle eggs. The transportation of coal, coke, and ore in the base of Weiqiao Town is an animal-powered train with a wooden track, which should actually be called a small ox cart, and there is no fire at all.

The wheels of this kind of car are wood, and the track is also wooden, although it is much more labor-saving than the shoulder lifting, but to catch up with the rain or something, the track will be very astringent, and the wood bearing is also astringent.

Hong Tao actually felt sorry for those cows, and he happened to have heat treatment equipment, so he just tried to see if he could make ball bearings. This kind of thing is not only free of cattle, but can also be used in horse-drawn carts.

Later, when they arrived in Huangzhou, most of the supplies had to be transported from Jingzhao Mansion. A car with ball bearings must save a lot of effort than the original car, after all, Huangzhou is a plateau, and it is not easy to send things up, so it can be regarded as being considerate of the crown, so that he and the Water Tiger Wing generals will suffer less.

"Come on, surround me, no one is allowed to leave!" Hong Tao said very happily, as soon as he was happy, he lacked a door, and chatted with the craftsmen about the prospect of the train.

Who would have thought that the wall had ears, when the people outside heard that a train could pull a hundred thousand pounds of weight and run faster than a horse, their eyes were round, and they couldn't hold back anymore, and rushed in with a roar.

“…… Pei, Pei, Pei Zhonggui? It's really you! What's going on? Commander Miao, are you going to rebel too, in broad daylight, in the imperial village, against the horses and the supervisor of the commission! ”

The appearance of this person made Hong Tao's brain a little short-circuited, Pei Ying has always followed the emperor, why did he suddenly appear in Weiqiao Town? The emperor certainly didn't come, because there was still a noise outside the window, and craftsmen everywhere. Even if the eldest brother doesn't have a shelf, he won't take a private visit.

Looking at Miao Kui's virtue again, he actually listened to Pei Ying's order, and led his subordinates to surround this big house, even if he didn't show up, his hand was on the handle of the knife. No matter what the reason is, anyway, Hong Tao has learned to button the big hat on the other party first, and he will know if it is suitable or not.

"Lord Wang...... Master Pei, he ......, "Miao Kui's face has turned into a sour pear, if you want to say that the horse is a bad person, he is the first to believe it, but if you want to say that in order to protect the horse, he will disobey the emperor's will." Simply, let's put the responsibility on Pei Ying, he takes it, why should he carry the black pot himself.

"Wang Xu, you are here to make no secret of such confidential matters, do you know what the consequences will be if you leak the news? Among these people, you can guarantee that there are no spies from the Xia Kingdom and the Liao Kingdom, even if there are no now, will there be one in the future? Pei Ying didn't deny it, he was worried about something else.

"Why is the news so important?" Hong Tao made Pei Ying stunned, he was already very careful about secrecy, don't look at Weiqiao Town, which is located in the wilderness, it is really not easier to enter than the north and south workshops in Kaifeng City, how can he be so blamed?

"You just said that you can carry hundreds of thousands of catties of goods, and it doesn't matter if the train travels hundreds of miles a day? If the Northern Dynasty is allowed to make this thing, the soldiers can be under the city of Kaifeng in a breath, where will Your Majesty be! "Pei Ying came to investigate the colt, and he seems to be a little preconceived, and he always thinks about the colt in a bad way.

"Fire, trains? Hey, hey, hey...... Pei Zhonggui, this is just a pastime for the officials and craftsmen after their fatigue, just listen to the story. Okay, there is no basis for what you say, come on, big head, tell me what story Master Pei has told you. ”

Hong Tao finally understood, it was a mistake to eavesdrop, and this was not a disaster. But it can't be taken lightly, it must be explained, otherwise people are the most unreliable of this thing, Pei Yingzhen went back and told the emperor that he really couldn't eat and walk around.

"Hey, hey, hey...... Lord Pei smiled, Lord Du Wei said that he could make a big bird with steel, fill his stomach with a lot of oil, and put a bamboo dragonfly on his head, he could fly up with black smoke, and he could travel thousands of miles a day, which was higher than the Jade Emperor's flight...... The Captain also said that when the time comes, he will take a few villains and hide them in the belly of the iron bird, each of them will carry a large umbrella, and then jump down from the clouds...... Hey, hey, hey...... Hahahaha......"

Wang Datou also came out of the palace, he may have seen Pei Ying, and he also knew the seriousness of this matter, but he couldn't help laughing as he spoke.

This colt is good to people, especially craftsmen, and has skills, but this mouth is too good to speak, and he can talk about everything, and he speaks the same as the real thing. If you don't believe him, he will pull you to bet, who dares to bet on this thing, it is enough for a Miao Kui to lose for five years, and whoever is fooled again is a fool.

“…… The dignified horse captain, the imperial court was slightly appeased, and the supervisor of the pit smelting and casting money department was mentioned, what kind of system did he wear like this! Wang Xu, don't you think you haven't caused enough trouble? If it weren't for His Majesty's protection everywhere, you would have been imprisoned a long time ago! ”

Pei Ying also understood, and it was the horse's bragging that caused the trouble for a long time, so she was even more angry. I had to hurry up in the winter, and I almost didn't break up my old bones, isn't it because he bragged about it, and he has not only repented until now!

"You can't put an adult in prison, what crime has the adult committed!" There was talk in the house, some could be heard outside, and there were people picking up.

"You, what are you going to do!" Pei Ying glanced at Miao Kui angrily, what kind of rules are these, and any identity dares to interject indiscriminately!

Miao Kui naturally understood the rules of the palace, and hurriedly turned his head to scold, and by the way, asked his subordinates to drive irrelevant people away.

Outside the house, a group of craftsmen had been gathered at some point, and the leaders were the old guys from the Hu family and the Wu family. Not only did they come, but a few of them had a swarm of bees on their shoulders.

This thing is no joke, and once it is ignited, no one can avoid it. Whether you wear armor at such a close distance is actually the same, and it is a hole next to it. No one can guarantee that the craftsmen will not use it, after all, they produce it.

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