To develop seamless steel pipes, Yang Wenli has to solve two problems, the first is high-temperature resistant materials, and the second is bearings.

The popcorn machine can make fragrant popcorn with rice, which means that a large amount of heat will be generated when the screw is squeezed, which can turn the rice into popcorn raw.

Of course, the seamless steel pipe is not extruded into a steel pipe with steel pellets, but a red molten steel.

Although the mechanical principle is the same, the raw materials are different, and the requirements for the extrusion screw are also very different.

The latter must be able to withstand extremely high temperatures, which is certainly not possible with ordinary steel materials.

Moreover, steel is susceptible to oxidation at high temperatures, which can significantly reduce its mechanical properties and service life.

Of course, Yang Wenli can't develop too high-end materials, and his method is to coat a layer of enamel on the surface of steel parts, which is generally alumina, magnesium oxide, silicon oxide, titanium oxide and other high-temperature resistant substances, and is also extremely resistant to oxidation.

Because the lining is still made of steel, it does not affect its mechanical properties, and the two complement each other perfectly.

The second difficult bearing is the ball, and the second is the assembly.

Because the ball must have super mechanical properties and service life, it can no longer be cast.

The problem of assembly is that there must be two processing methods, cold and hot, the inner groove is cooled, the outer groove is heated, and then the ball is also cooled, and the principle of thermal expansion and cold contraction can be used to assemble precision bearings.

Yang Wenli chose to make bearings first, according to the size of the steel pipe, Yang Wenli designed several specifications of bearings, bearings are general original components, so he also has to consider the future use, formulate standards.

After setting several specifications, he designed the specifications of the inner and outer grooves and balls, which should consider the precision level, Yang Wenli because he has a strong sense of God as a guarantee, so he asked for trouble, from the beginning set the precision standard very high, the gap is within 0.1 mm, which is about equivalent to the level of the later Chinese nineties.

After all the preparations are done, start to make, some equipment and tools, such as cold drawing equipment, some equipment has to be made, such as cutting machine, extruder, ball mill, fine grinder, straightening machine, etc., very troublesome, by no means overnight.

Just as Yang Wenli led the slave soldiers to stay in the new factory and concentrate on developing various equipment and parts, Yang Rentian led his troops to set off again.

Although Yang Wenli said that he could stay for a few more days, he did not dare to stay longer when the task of conquering the islands on the sea was placed there this year, so he only rested for two days before setting off again.

There is no shortcut to get to Tokachi from Sapporo, so you must first head north to the northernmost point of Ezo Island, the Yongfu Plain, and then make a U-turn along the coastline and head south.

Along the way, Yang Rentian was very cautious, and the front of the army was widely sentry, and he went out for five miles at most.

To the east of Ezo Island, the situation was completely different, because the Ainu people did not work as farmers, and there were too many people to stay in the Tokachi Plain to make a living.

Therefore, the Ainu people here are based on surnames and live separately in various places, usually a few hundred people form a village, which gives the Black Armor Army an opportunity to take advantage of.

"My lord, my subordinates and others have found another Ainu village in the recess of the mountain in front, and it is estimated that there are more than 500 people." A soldier in charge of the front guard hurried back to his boss to report the news.

"Good! You guys hide and keep an eye on the village, don't alarm them, and I'll report to Elder Shi right away. The captain was so happy that he immediately gave the order, and then he turned his horse and hurried to his own formation, not even bothering to listen to the answer of his men, which shows how excited he was.

Along the way, there have been more than ten villages that have been pulled out, because the Black Armor Army is a lion and a rabbit every time, so no one has escaped.

The Ainu villages, after watching the nature documentaries of Africa, do not take a second look, and are almost exactly the same as the primitive tribes of Africa.

A simple fence wall, no more than two meters high, with some skulls of bears and other beasts hanging on the fence wall to scare the attacks of predators, and in the yard is a safe space for children and women.

However, there is a slight difference, because there is only one ethnic group on the entire Ezo Island, and since the Ando clan removed the Hakodate, they have not been warped for many years, and wars only exist in ancient legends.

Their sense of security is very poor, thinking that if there is a fence to cover it, the tribe will be safe.

This time, the Black Armor Army accelerated its attack with a small banner of troops, about two taels away from the village, and the Ainu, who were not at all defenseless, were all captured.

"My lord, further on is the Shikachi Plain, where the Ainu patriarch is." Tanaka followed Yang Rentian's side and reminded him at the right time.

"How many people are there?" Yang Rentian asked him.

"This ...... The villain is not very clear, but at least 30,000 people are on it, and it is the largest Ainu settlement on Ezo Island anyway. Tanaka replied.

"It seems that we can't use the method of surprise attack this time, if we continue to use the previous method, it will inevitably cause a lot of casualties, which is very detrimental to subduing them." Yang Rentian sat on the horse, looked ahead, and muttered to himself.

Suddenly, his expression was straight, and he ordered sharply: "Come on, order the troops to form a team, and all the troops will retract and form a queue, and the troops will win ten victories." ”

"Yes," his slave Yang Lihong replied loudly.

This time, Yang Rentian wanted to change the method, he wanted to force people, so he didn't even send a reprimand, because he didn't plan to hide the whereabouts of the army, but the whole army was in a whole formation, lined up in a huge cavalry queue, and went straight to the top ten victories.

Although a large number of prisoners were taken along the way, it was impossible to sprint at high speed, but with 10,000 people, it covered the sky, and the hooves of tens of thousands of war horses, like an earthquake, were heard from miles away.

Naturally, the news was reported to the Ainu tribal chief: "Report...... The patriarch, eight miles away, found a large number of enemy horsemen, suspected to be tens of thousands, and they also captured all the people of my northern tribe. ”

"What? Is it Matsumae Domain? Who has such a big force? Tens of thousands of cavalry, not a single daimyo has this power, only the shogun of the Shogunate can do it. ”

Tarikona, the patriarch of the Ainu people of the Tokachi Plains, was frightened and asked again and again in disbelief.

Today's Ainu people have long been ignorant of war after dozens of hundreds of years of peaceful development since they signed the "Yiren Trade Agreement" with Yoshihiro Oysaki, and Tarikona is a person who grew up in a peaceful environment, and when he heard that tens of thousands of cavalry were coming, he panicked.

"Report to the patriarch, the enemy is not a peacemaker, it is an all-ironclad elite cavalry, they are all tall, I don't know where the force is?" The messenger replied.

"Come on, blow the trumpet and assemble immediately, and fight the enemy with me." Taricona saw that he couldn't ask for any useful information, so he immediately decided.

"Woo"......

On the quiet and peaceful Tokachi Plain, the horn was particularly loud, and the tribesmen who were hunting, fishing, fishing for kelp, and collecting wild vegetables in various places immediately rushed to the trumpet, and it didn't take long to gather thousands of troops.

……

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