When he returned to Fanjiazhuang, Li Zhi inspected various industries again. After confirming that there was no problem, he began to invest in the development of rolling bearings.

Bearings are indispensable in industrial production. They can greatly reduce the rotational friction force at mechanical connections, improve the operation efficiency of machinery, and enhance the stability of machinery operation. Without bearings, modern machinery cannot be made at all.

As an industrial designer, the production of bearings is also a basic skill. Before traveling through time, Li Zhi understood the principles of bearings and also consulted some simple methods for making bearings. Now he is taking them out and using them.

Li Zhi selected ten blacksmiths who could process steel tools from the blacksmith who were gun smiths. He chose the ten most honest people and called them to a specially built workshop to stand. The workshop was divided into ten rooms, each room with a stove for smithing iron and steel.

Li Zhixian educated them on confidentiality regulations: "I'll ask you to do a new thing. After this thing is done, your monthly money will be increased to three taels a month, and three meals will be the same."

The craftsmen were very excited when they heard Li Zhi's words.

Adults are going to make new things? This time I found myself and I am going to make a fortune!

Li Zhi excited the craftsmen for a while, and then slowly said, "But give you a high salary, what you want is for you to keep the secrets strictly. If I find out who leaks the secret of producing this thing, it will be a death sentence!" He looked at the ten blacksmiths coldly, and Li Zhi said, "The nine traitors in the glass workshop are precedents. You don't want to repeat the same mistakes, right?"

Before the ten craftsmen were happy for a while, they became nervous when they said Lord Shou.

Wu Tietou, who was chosen as the craftsman, quickly replied:

"Does the Lord Cao Guan trust me Wu Tietou? Even if I hold my neck with a knife, I won't reveal any secrets!"

The other craftsmen also replied: "Sir, we are all honest and honest blacksmiths, and we will not reveal our secrets!"

"Sir, we all do things honestly and will not leak secrets."

Li Zhi nodded and said, "This new workshop implements a joint seat system. One person leaks secrets and ten people are punished together! The leaker is beheaded, and the others will also deduct a year's salary. So if you see others stealing secrets, you must go up to stop them and report them!"

Wu Tietou patted his chest and said, "Don't worry, who steals the secret, Wu Tietou is the first to be with him!"

Li Zhi looked at the blacksmiths and saw that the blacksmiths were shocked by their serious expressions. Then he said, "What I want to make is called a bearing! I want to make eight steel balls with good Su steel, and polish them. Then I also have to cast two steel rings, one large and one small, and leave tracks of two steel balls on the steel ring. Then let the eight steel balls rotate on the track of the steel ring. Finally, make two iron cages, fix these steel balls inside the steel ring so that they don't collide."

When the ten blacksmiths heard Li Zhi's words, they were a little confused. They had never seen a rolling bearing, and they didn't know what Li Zhi was saying.

Li Zhi began to teach them one by one.

Li Zhi divided the bearing production into five processes. The first process is to make two steel rings, one large and one small. The second process is to cut off the steel rod in small sections as raw materials for making balls. The third step is to heat the balls raw materials, then use the high-temperature and soft ball raw materials to hit the small steel rods into balls. The fourth step is to use a good porcelain clay grinding wheel and a steel grinder to polish the balls, eliminate burrs, and polish the steel balls. The last step is to use iron sheet to make two cages, clamp the balls on both sides, and fix the steel balls to the established position of the track.

Li Zhi divided the ten craftsmen into five groups and operated different processes. Li Zhi asked the craftsmen to only pay attention to their own processes and not be allowed to understand and inquire about other people's operations.

Then Li Zhi took out the drawings he drew and showed them to five groups of craftsmen in each process.

After looking at the drawings, ten craftsmen had some ideas and knew what they should do.

Li Zhi guided the craftsmen step by step, from beginning to end to build bearings.

First, cast steel rings, which is simple. Use sand to make molds and cast steel and then form them. However, in order to reduce the pores and honeycombs on the steel parts, Li Zhi asked the blacksmiths to use the cast steel rings to make iron molds, and then use iron molds to cast steel rings.

Then burn a round steel rod and braised softly, and press it on a simple feeder to cut out small pieces of steel as the raw material for the ball.

Put the ball raw materials in a stove and heat them until red heat, take them out one by one and place them on a steel block with semicircular holes. Use a steel stick with semicircular holes on the ball raw materials with a stick head, and use a hammer to hammer the steel stick to squeeze the raw materials into a spherical shape.

After obtaining the rough balls, use multiple ball sieves to screen the balls to remove balls that are too large or too small. Then use a grinding wheel and a grinding disc to deburn the balls. After obtaining the smooth balls, the balls are tempered and heated, and finally poured into the burning oil to quench to increase the hardness of the balls.

After the balls are made, arrange the balls in a row and put them into the outer ring of the bearing. After installing the inner ring of the bearing, slide the balls to different positions. The balls and the inner and outer rings will be connected together and will not fall off.

Finally, use iron sheet as a cage, fix it with steel nails, wrap the balls from both sides, so that the eight balls are evenly distributed inside the steel ring without collision and friction.

Li Zhi guided different blacksmiths one by one to manufacture tools and produce production. In the end, it took fifteen days to make the first rolling bearing of this era.

Li Zhi added some oil to the bearing, put the bearing on his hand and turned it hard. The bearing turned four or five times and stopped.

Seeing the final effect of the bearing, the blacksmiths were all very surprised. The craftsman Wu Tietou said, "Sir, the wise man can roll so many times in this circle by itself, it's so smooth! Sir, what is this for?"

Li Zhi did not answer Wu Tietou's words, and was thinking about why the bearing was not good? He could only turn four or five times. Although this is much better than those without bearings, it is obvious that the bearing designed by Li Zhi should not have such an effect. After thinking about it, Li Zhi felt that the inner and outer rings of the bearing were too rough and the friction coefficient was too high, causing the ball to stop after turning a few turns.

It seems that the inner and outer ring tracks of the bearing must also be polished.

Li Zhi added another process to the entire production - polishing the inner and outer ring tracks - after the steel ring is cast, the burrs are polished with a good porcelain clay grinding wheel and a steel grinder disc.

After another three days, Li Zhi led the blacksmith to make polishing tools and polish the ball tracks.

After the bearing was remade, the oil was applied, Li Zhi grabbed it in his hand and turned it hard. The bearing did not stop this time. It took him a long time to turn it, and it took him at least a dozen times before it stopped slowly.

Such bearings can already meet the use of Li Zhi, and Li Zhi is very satisfied.

He was happy, and Li Zhi shouted: "The bearing was successfully manufactured, and each of the ten craftsmen gave a reward of three taels of silver!"

The craftsmen were overjoyed and said loudly: "My dear sir!"

"Sir, I'm so proud!"

"Thank you sir!"

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Chapter completed!