The heat treatment of metal materials is a complex discipline.

Especially in the 1970s and 1980s, with the rapid development of integrated circuits and the continuous emergence of new materials, foreign heat treatment processes have also made great progress.

When foreign technology was developing rapidly, we were engaged in internal strife and still used the technology from the 1940s and 1950s, and were in a hurry to move forward. This led to a widening gap between us and foreign countries in terms of technology.

Due to Yao Yuan's foresight, Jiang Meimei, a group of managers with modern management awareness, and revealed many key structures and technologies in advance. Large-scale engineering machinery manufactured by mining machines are actually not backward overall.

As long as the manufacturing technology and methods that can be achieved at home and have little gap with foreign countries, mining machines will also do the best.

It’s just that in terms of details and where higher technology is needed, not to mention Jiang Meimei, even Yao Yuan has no choice.

For example, in order to rescue mining machines in the last life, Yao Yuan dismantled and studied large foreign machinery in detail, but he could only see the structure and technology that could be seen on the surface. How to heat treat consumable parts, he could not learn such things that cannot be seen from the surface.

Therefore, the appearance and structure of large-scale construction machinery produced by mining machines are not much different from foreign products, but the details are far behind them.

Other people's consumable parts can be used for several years without having to replace them, but the mining machine can't even be used for several months.

In this comparison, many companies that originally ordered the order require a return. They just don’t return the goods. The next time they order, they will not ask for the mining machine products, which is not enough to delay the trouble.

New products of mining machines are facing the risk of failure. The new products have died, and the mining machines and Yao Yuan’s Building Group may also face bankruptcy because of excessive investment in mining machines in the early stage.

The situation has become more serious once again.

This situation was impossible for sales manager Liu Jian to deal with it. Those large and famous companies could not give him such a great deal of face.

Yao Yuan had to take action himself and went to the descendants of his uncles with shamelessness. After saying all the good things, they promised to give him another chance. If there is no improvement in the next delivery machinery, they will have no choice.

It’s not that they don’t want to support national industry, but if your things are always not good, how much waste will it cause to the country!

Yao Yuan came back from outside and convened all senior executives of the Large Machinery Department to hold a meeting to explain to them the current severe situation facing the mining machine again.

They only have half a year. When the second batch of products are delivered next year, if the wear resistance of consumable parts cannot be solved, they will have no chance.

At the meeting, executives expressed their opinions and said that the problem returned to the beginning. The material and heat treatment level of domestic metal materials determine that they could not achieve the quality of foreign products. This is a flaw and there is no solution at all.

"If you can't do it, you have to do it for me!" Yao Yuan was really anxious. Mr. Yao, who has always been known for his gentleness, has faced senior executives for the first time in history.

"No matter what measures are taken or what means, next year's products must meet customer requirements!"

He had a dark face, stopped reasoning with the executives, and shouted loudly: "Otherwise, we will be done!"

Jiang Weidong looked at Yao Yuan's face that was a little deformed because of anger and said hesitantly: "Otherwise, let's buy a similar foreign machine, disassemble it, and study it in detail?"

Seeing that Yao Yuan did not express his opinion, he explained tentatively: "I know that this type of large equipment is very expensive. However, we are working behind closed doors at home, and we really have no clue..."

"Buy!" Yao Yuan interrupted him and said directly, "We are facing life and death now, and we can only spare no expense!"

In this way, large foreign machinery was bought and dismantled in the mining machine research institute.

Only then did everyone know how big the gap between us and abroad.

Just one pin shaft and pin hole fitting is a completely different process. For pin holes, the domestic manufacturing method is surface carburization and quenching after drilling of the machine, while the pin shaft is high-frequency quenching.

The body holes in foreign countries are welded with special materials and then milled directly.

The material welded on the layer is very hard, has a smooth surface, and has a wear resistance much greater than the material properties obtained by domestic heat treatment processes. But no one can understand what materials they use and what methods they use to weld on.

The only way that can be used in China is to inlay a cemented carbide sleeve to make holes. However, the cemented carbide is too brittle to withstand radial forces and is easy to break.

When things were at critical moment, Yao Yuan did not dare to be careless and could no longer be a hand-off manager. He also spent every day in the research institute and personally directed the research work.

A foreign equipment costs millions. After disassembling and researching it thoroughly, it can be sold, and the loss is not large. However, by observing the external structure of others, it is difficult to know the properties of the internal materials. This is also the reason why Yao Yuan did not thoroughly study these materials in his previous life.

This time, Yao Yuan didn't care about the loss, so he made a decision: "Damage it, take out the materials, and do laboratory analysis. You must find the key technology for me!"

The key material is damaged and taken down. The result of the test is a tweezer chromium alloy. This alloy is available in China, but it is directly welded on it. How to make welding wire and weld it? At high temperatures, there is no deoxygenation or changes in metal properties, which affects performance? This is a difficult problem. Because theoretically, it cannot be done at all.

There is also pin shaft, which is the material of other people’s pin shaft. The test-tested material is chrome steel alloy, and there are also matching steel models in China.

Finding available steel is only the first step, and the key is to solve the wear resistance problem.

The other person's pins have obviously also undergone heat treatment. However, the color after heat treatment is a light yellow on the surface, which is obviously different from the light blue on our heat treatment.

Obviously, the heat treatment process between them and us is different, which is the key to the wear resistance of their products.

We proposed various solutions around this pin, such as curve tempering, secondary quenching, lime insulation, etc. But the final product was still different from others.

Some people guessed that the light yellow color on the pin was coated with a wear-resistant coating? But the coating was too thin to detect what it was.

At this time, Yao Yuan suddenly remembered that it was the color of the vacuum heat treatment furnace after quenching.

In his last life, there was no vacuum heat treatment furnace in China, because there was no suitable sealing material and it was impossible to maintain a vacuum space under high temperature resistance heating.

He knew the general structure and working principle of vacuum heat treatment furnaces, and also saw what the surface of the workpiece looks like after vacuum quenching, which is what he sees now. However, in his last life, this kind of equipment was not able to be manufactured in China, let alone now?

Yao Yuan was really discouraged. The foreign processing technology level cannot be achieved with the current technical conditions of mining machines! Not to mention mining machines, there is no manufacturer in the country that can be achieved.

Just a chrome steel pin heat treatment, no matter how domestic methods are used, they will decarbonize the chrome steel, lose its wear resistance, and cannot reach the level of similar products abroad. Let’s not talk about the others.

After studying for a long time, Yao Yuan already knew that this was a dead end before others had lost their confidence.

At that time, I just thought that with his foresight, he could create the same equipment as abroad. But I didn’t expect that in these technical details, they had already advanced our generation. Now, we can’t understand what they do.

The feeling of failure enveloped Yao Yuan. He knew that research was just a blind study and could not find a way out. He stopped going to the research institute anymore, and even vacuum heat treatment was too lazy to talk to Jiang Weidong and Ding Qun.

He returned to his office and closed the door. No one was allowed to disturb him, and even Du Juan was allowed to go in.

He had to calm down. Since he knew that building large-scale construction machinery was a dead end, there was no need to spend more time on it. He had to think about how to save himself next.

How to deal with the aftermath? How to deal with the mining machine? How to repay the bank loan? How to keep the Building Group?

He traveled back from time to time and worked hard for many years, but he didn't want to have nothing to do and start from scratch.

He was so busy in the house for three days, but he didn't come up with a solution to both sides. He decided to go to Liu Ergan. This old guy who is proficient in ancient classical Chinese and history may be able to find him a way to escape from the cases of ancient history.

Yao Yuan always believed that ancient China was an era full of wisdom, and the thoughts of the ancients were far more brilliant than today.

Liu Ergan is already old and can no longer follow him. He sent him to the Anti-Anti-Anti-Anti-Anti-Resistance Charity Fund and lived in the nursing home. When he had time, he went to see him and discuss some ancient and historical events with him.

However, recently, this old guy has had a good time with an old lady in the nursing home. He doesn't have much time to pay attention to him and is still thinking about getting married to him.

Yao Yuan is so angry. How old are you still getting married at the same age? The old men and women are all in the same yard, playing together, why are they getting married?

Liu Er refused to do it and insisted on living with the old lady and being together day and night.

Yao Yuan couldn't resist him, so he discussed with Kangkang and Uncle Ma to see if he could build a single room and let the old man and the old lady live together? Anyway, he is so old, as long as they think it's good, but it's okay if they really get married.

Liu Ergan is quite stubborn this time. He can't live together without understanding. He has to give the other party a title.

My old man has never been married in his life. When he gets old, he finally finds a wife and doesn’t let him get married. What’s the matter with him? No!

Hey, you bad old man! I still say I won’t listen to you anymore, right?

The relationship between the two is between father and son. Sometimes no one can convince each other, and quarrels are common.

In the end, both parties made a concession, not going to the Civil Affairs Bureau to get a marriage certificate, causing trouble for the public, and simply holding a wedding in the nursing home, and then getting married and living in the same house.

Yao Yuan was angry with the old man about this matter and hadn't been to see the old man for a long time. Besides, there is an old lady in the old man's house now, so it's not convenient to speak.
Chapter completed!