After Cen Youjun left, Lang Dong and Ma Jie, a student from Huaqing University, came in. Lang Dong's face was full of joy, but when Lin Zhenhua saw him, he was startled.

"Old man, why did you lose weight like this?" Lin Zhenhua asked.

Before Lin Zhenhua went abroad, he found that Lang Dong seemed to be a little thinner, and he hadn't seen him for a month, and this feeling became more and more obvious. The original Lang Dong, although he can't be regarded as a big waist and a round waist, at least he is still very strong, and now, his figure has become thin, and his face is even thinner and sunken.

"It's okay, this paragraph, I'm tired." Lang Dong didn't mind, he walked to Lin Zhenhua's desk, spread out a bag of balls wrapped in oiled paper, and then looked at Lin Zhenhua and said, "Manager Lin, look, this is the bearing steel ball we made." ”

"Yo, that's beautiful." Lin Zhenhua picked up a steel ball and looked at it carefully in the sun, "Not bad, the finish is very high." ”

Lang Dong said proudly: "Manager Lin, what you see is only a superficial phenomenon. The most important thing is that we have finally solved the problem of heat treatment of steel balls. Do you know how long the wear life of our steel balls is now? ”

Lin Zhenhua vaguely remembered that Lang Dong once told him about this problem, due to the lack of heat treatment process, the wear life of the steel balls produced by Xunzi is only 500,000 rpm, while the steel balls on imported bicycles are 2 million rpm. At that time, Lang Dong said that he wanted to solve this problem, looking at Lang Dong's meaning, could it be that he had already solved this problem?

"What, old man, won't you tell me that the lifespan of this batch of steel balls can reach 2 million revolutions, right?"

"What is 2 million?" Lang Dong laughed, "We have tested it, and it has 2.5 million rpm, which is better than the steel ball on the imported car." ”

"Come, tell me how you all got it." Lin Zhenhua is also interested, he knows how much significance a set of effective heat treatment process is for the machinery industry.

Lang Dong sat down and began to talk to Lin Zhenhua, while Ma Jie sat on the side, shyly adding a few words for him from time to time.

Steel ball is an important part of the bearing, and the production of a steel ball roughly goes through several steps. First of all, the steel wire of a specific diameter is fed into the cold heading machine, and the steel mold is upset into a ball embryo. Subsequently, the light ball and soft ball are drilled, that is, the ball embryo is ground to the specified ball diameter and a certain surface roughness is required.

The next step is heat treatment. The heat treatment of the steel ball is very troublesome, it should make the inside of the steel ball achieve a certain toughness, and the surface has a certain hardness and wear resistance. The formation of wear-resistant surnames largely depends on the carburizing treatment of the surface steel.

After the heat treatment, the next step is to grind the steel balls to the specified precision and finish with a grinder. The effect of this process has a lot to do with the quality of the grinding machine. GCA has a precision grinding machine imported from Germany, so the grinding problem has been solved. Just now, Lin Zhenhua saw that the finish of the steel ball is very high, in fact, it is mainly due to the precision grinding machine, and the effect of heat treatment in this regard cannot be observed by the naked eye.

The heat treatment process is a secret in many enterprises. If Lang Dong wants to solve the heat treatment problem of steel balls, he can only rely on his own exploration, and the method of exploration can only be experiments.

Ma Jie and Du Xiangyang of Huaqing University have a deep interest in solving this heat treatment problem, they first put forward some possible directions from the material theory, and then read a large number of foreign materials, through some of the clues, to speculate on the methods of heat treatment done by foreign counterparts. A few years ago, at the request of Lin Zhenhua, Qian Yuanping of Hong Kong was collecting information on the machinery industry from all over the world, which is now piled up in the data room of the Chinese company, which has become the basis for the research of Ma Jie and Du Xiangyang.

Once you have the basic idea, you need to do experiments. Lang Dong personally went out to let the workshop produce a large number of spherical embryos, and then heat treated them with different process methods, and then tested the heat treatment effect item by item.

The difficulty of heat treatment lies in the sheer number of methods available. In terms of carburizing process, there are solid carburizing, liquid carburizing, gas carburizing and other methods. In terms of carburizing agents used, there are several kinds such as charcoal, live carbon, yellow blood salt, kerosene and so on. In the early days of carbonitriding, the highly toxic sodium cyanide was used as a carburizing agent, so this process is also called the cyanide process.

There is also the temperature control of heat treatment, different temperatures will produce different effects. What's more troublesome is that the temperature setting is not static, but a dynamic process. For example, a process may require that the balls be heated to 800 degrees Celsius, then cooled to 200 degrees Celsius at a uniform rate for 1 hour, held for another 2 hours, and then rapidly cooled to 20 degrees...... Although all such temperature curves can be deduced theoretically, the effect can only be verified by experiments.

"We've done nearly 10,000 experiments! And now it's finally working! Lang Dong said to Lin Zhenhua excitedly, his face was full of a kind of excitement after success, only people who have paid infinite hardships to achieve success can have such an excited expression.

"The data of these 10,000 experiments is priceless." Ma Jie also said, "I have already reported to Mr. Yao, during the summer vacation, he will personally bring a team to analyze these data, from these data, we can explore at least 20 different heat treatment processes, suitable for a variety of different materials can be requires." ”

"Old man, pony, you've worked hard." Lin Zhenhua said sincerely, he turned his head to Lang Dong and said: "However, Lao Lang, you really can't work so hard, there are some things, just let Ma Jie and the young people do it, you are also a handful of years, you have to take care of your body." ”

Ma Jie interjected on the side: "Manager Lin, you don't know. When I was doing a lot of experiments, Manager Lang didn't let Xiang Yang and I participate, he stayed alone in the laboratory to burn the stove and shut us out. ”

"Why?" Lin Zhenhua asked in surprise.

Lang Dong said: "I have nothing to do anyway, this kind of thing is very boring, I'm afraid that they young people won't be able to bear it." ”

Ma Jie said: "Manager Lin, it's not like this. This is because the carburizing agent we use when doing heat treatment has a certain poisonous surname, Manager Lang said, I and Xiang Yang are still young, I am afraid that we will deal with drugs all day long. ”

"Old man!" Lin Zhenhua only felt an inexplicable feeling in his heart, "Old man, how can you do this!" Young people can't be poisoned, can you? ”

Lang Dong was a little embarrassed when Ma Jie exposed the truth, and he said, "Manager Lin, don't listen to Ma Jie's nonsense. Poisonous or not, haven't I been for so many years? In the past, when we used to make salt baths for steel balls, we used sodium cyanide, and the labor protection at that time was not as good as now, didn't I have nothing to do? ”

Lin Zhenhua looked at Lang Dong's face and asked, "Old Lang, are you poisoned when you are so thin this time?" ”

"It's okay, it's okay, I'm just a little tired, just rest for a few days."

"No way!" Lin Zhenhua said categorically, "You must stop working immediately and honestly go to the hospital for a physical examination." In addition, in the future, things like this kind of poisonous operation must not be done by one person from beginning to end, but must be done by different people, and labor protection must be strengthened. ”

Lang Dong said: "Manager Lin, how can there be so many people to do these experiments now?" Just find a young man, they don't know the situation. Besides, we have already passed the hurdle of heat treatment. In the next step, I plan to take Ma Jie and them to attack the process of protective welding, which will be used when welding car frames. ”

Lin Zhenhua waved his hand: "Your task now is to go to the doctor, unless the hospital issues a certificate to prove that you are fine, you are strictly prohibited from entering the laboratory for another half step." ”

"Manager Lin, you don't have the authority to do this!" Lang Dong was a little anxious, "I'm not sick, you can't stop my work." ”

Lin Zhenhua was also anxious: "Old man, let me tell you, I have the right to do this." Your personnel relationship is in Xunyang Bicycle Factory, which is the place of my Hanhua Industrial Company, and I have the right to refuse you entry into the laboratory. ”

"You ......" Lang Dong was dumb all of a sudden, of course he knew that Lin Zhenhua said this for his good. At the same time, he also knew that Lin Zhenhua usually seemed to be very talkative, but once he was stubborn, he couldn't turn back with five cows. He controlled his emotions for a moment and said in a begging tone: "Manager Lin, I know you have good intentions. Otherwise, if this doesn't work, I'll go to the hospital for a physical examination, but you can't stop me from participating in the experiment, I'm only giving guidance on the side, okay? ”

Lin Zhenhua walked up to Lang Dong's side, patted his hand, and said, "Lao Lang, don't fight, the product is very important, but the person is more important than the product." I just saw you slim like this, and I thought there was something wrong. Now listening to Ma Jie's words, I think you must be poisoned, if you don't go to treatment quickly, the root of the disease will affect you for the rest of your life. ”

Lang Dong said: "Manager Lin, please understand my feelings. I'm a cyclist, and my lifelong wish is to make the best bike possible. Thank you for giving me the opportunity to invest millions in developing a new bike. Seriously, for me, it's okay to be affected a little bit, it's good to take care of it a little bit later. To be able to make a world-class bicycle with my own hands is not in vain. ”

Lin Zhenhua said: "Lao Lang, I completely understand your feelings. You can rest assured, no matter how much money is invested, I will definitely let you make this bicycle, and our bicycle must be the first in the world. However, the rice should be eaten bite by bite, leaving the green mountains behind, not afraid of running out of firewood. Lao Lang, I hope you will go and have a good examination of your body, and if there is a problem, you must treat it in time. I have another very important thing for you to do, and it requires you to have a strong body. ”

"What's the matter?" Lang Dong asked anxiously.

Lin Zhenhua said: "Next July, I want to organize a team to participate in the Tour de France, and I hope that you can be our team leader." I hope you can ride our GCA bike to win the Tour de France! ”

(To be continued)