Wang Weilong knew Feng Xiaochen's personality quite well, so he was no longer polite to him at the moment, but led him to the side of the dump truck and introduced him to the fault that everyone was dealing with. Pen @ fun @ pavilion wWw. ｂｉｑUｇE。 ｉｎｆｏ

The fault is on the electric wheel behind the right side, and the wheel side reducer gear in the electric wheel has a broken tooth.

Electric wheelers work by using a diesel engine to generate electricity and then transmit electricity to each wheel. There is a set of electric motors and corresponding transmission devices in the wheels, which can drive the wheels to rotate and drive the vehicle forward.

The power of an electric wheeled vehicle is transmitted through electrical energy, which is much simpler in structure and easier to maintain than a mechanically driven vehicle. Because the control of the working state of the electric motor in the wheel is relatively simple, it can be changed at any time with changes in slope, load, vehicle speed, etc., so the efficiency of the engine is higher. In addition, in terms of traction and braking, electric wheeled vehicles also have incomparable advantages over mechanical transmission.

The drive system inside the electric wheel includes an electric motor and a wheel side reducer, and the latter is used to transmit the power deceleration and torque increase of the motor to the wheel hub to drive the wheel to rotate. For the 120-ton electric wheel dump truck, due to the weight and complex road conditions in the mining area, the gear mechanism of the wheel reducer has been in the working environment of high temperature, high pulsating load and poor lubrication, which is very easy to be damaged. This time, Wang Weilong, what they are dealing with is the failure of the wheel reducer.

"It was the teeth of the planetary wheel that were broken, and counting this one, such failures have occurred a total of seven times. Wang Weilong said.

"Have you found the reason?" Feng Xiaochen asked casually.

"I'm looking for it. Wang Weilong said, "You see that one with a little gray hair, he is an engineer in our factory, named Chen Bangpeng, who specializes in reducers." In fact, he is about the same age as me, just to think about this reducer, and his hair has been boiled white in the past two years. ”

"Admiration. Feng Xiaochen said. He recognized this Chen Bangpeng as one of the few people who were not willing to applaud just now, probably because of some technology, so he didn't like to be inflammatory. For this kind of pure technical nerd, Feng Xiaochen has always cared too much about their attitude, he knows that these people only have professional technology in their eyes, and they don't like anything else. It's also easy to be friends with these people, and that is to convince them technically, otherwise you'll be just a passerby in their eyes.

"Chen Gong, haven't you found out the reason yet?" Feng Xiaochen stepped forward, squatted next to Chen Bangpeng, and followed him to observe the broken tooth.

Chen Bangpeng turned his head to look at Feng Xiaochen, snorted, and said, "Director Feng is experienced, why don't you tell us why this gear tooth is broken?"

"Old Chen, how can you talk like that!" Wang Weilong couldn't hold back his face beside him, Chen Bangpeng's words were obviously provocative. Feng Xiaochen just sent meat and eggs, you don't show that you are moved, and you still talk in such a weird way, you really don't know what to do.

Chen Bangpeng's attitude towards Feng Xiaochen is also due to an inexplicable evil fire. In fact, since he found that the reducer had broken his teeth again and again, Chen Bangpeng's temper has become very bad, and he and his own people in the team have to make hair from time to time, but everyone is used to his temper and doesn't care about him.

Yan Fusheng accompanied Feng Xiaochen over just now, and such a high-profile promotion of Feng Xiaochen's merits made Chen Bangpeng, who was depressed, even more unhappy. Yan Fusheng and Wang Weilong both claimed that Feng Xiaochen bought meat, eggs and chickens for everyone out of his own pocket, which Chen Bangpeng absolutely did not believe, he felt that Feng Xiaochen must be doing his own show with public funds, plus he heard that Feng Xiaochen was a deputy director at a young age, which made Chen Bangpeng feel even more disdainful:

Nima, this deputy director must have earned it by putting on a show all day long, and what Lao Tzu is most unaccustomed to is this kind of official who is promoted by bragging, and he looks like a young man with a rampant appearance, I'm bah!

In front of everyone, of course Chen Bangpeng couldn't directly express this emotion, and even when everyone applauded, it was inconvenient for him not to applaud maverickly, so he could only deal with it perfunctorily. He thought that he would just not provoke Feng Xiaochen, but he didn't expect Feng Xiaochen to come over and ask him what the reason for the broken tooth was, he felt that if he didn't choke Feng Xiaochen well, he would be sorry for his full stomach.

"Lao Wang, I am humbly asking Director Feng for advice. Chen Bangpeng said with a smile, "Director Feng is in an important position at such a young age, and he must be knowledgeable and proficient in technology. Didn't Director Yan just say that Director Feng also helped other people's power plants solve the maintenance problem, and now we are also encountering problems, so it is okay to ask Director Feng to help. ”

"Lao Chen! Xiao Feng is my friend, don't embarrass him. Wang Weilong said, and after that, he was about to say a few words to Feng Xiaochen, but unexpectedly, Feng Xiaochen raised his hand to stop him.

"I think this gear must be broken by fatigue. Feng Xiaochen pointed to the place where the tooth was broken and said to Chen Bangpeng.

"How do you see that?" Chen Bangpeng asked coldly.

Feng Xiaochen said: "It's very simple, there are several micro-cracks next to this, and there are traces of distortion next to the fracture, obviously not because of the overload fracture caused by the sudden impact overload, but because of the repeated action of the excessively high alternating stress, which causes the fatigue crack to continue to expand, and finally exceeds the ultimate stress, which leads to the break." ”

"Hmm. Chen Bangpeng replied lightly, and then said: "It is indeed a very simple truth, and we have already seen it." ”

"There are many reasons for fatigue breakage: transmission overload, improper materials, low gear accuracy, insufficient design load, poor tooth contact, excessive machining roughness, or micro-cracks and residual stress caused by heat treatment. Now that he has spoken, he simply shows off.

Feng Xiaochen bought a bunch of meat and eggs bitterly and came to comfort everyone, the fundamental purpose was to make a familiar face among Luo Ye's employees, so that everyone had a good impression of him. Luo Ye is a key enterprise in equipment manufacturing, and in the next few decades, Feng Xiaochen will definitely continue to deal with this company, and it is definitely beneficial to have a good relationship now.

But who knows, when he encounters such a faceless Chen Bangpeng, he may even treat his kindness as a donkey's liver and lungs, and Feng Xiaochen has to fight with him. If Chen Bangpeng's arrogance is not beaten down today, even if the dozens of yuan he spent are thrown into the water, these people in Luo Ye will quickly forget him, and even be infected by Chen Bangpeng and despise him.

If you want to combat Chen Bangpeng's arrogance, you have to have some dry goods, which Feng Xiaochen understands. Electric wheel dump truck, Feng Xiaochen has also been in contact with this kind of thing in his previous life, as a doctor of mechanical engineering, there is no difficulty in understanding some such knowledge, he really doesn't believe that he will let Chen Bangpeng look flat.

Sure enough, hearing Feng Xiaochen list the reasons for various fatigue and breakage like the names of dishes in cross talk, Chen Bangpeng's face suddenly changed color, half surprised, half worried. Needless to say, he didn't expect Feng Xiaochen to be able to explain a question so professionally, replacing it with himself, he definitely didn't have this attainment when he was 20 years old. The worry is that he faintly feels that he may be slapped in the face, and he originally wanted to humiliate the other party with his skills, but the other party is not a rookie at all, and his pretentiousness just now has become a joke.

"What does Director Feng think is the reason?" Chen Bangpeng asked rhetorically.

Feng Xiaochen said with a smile: "Chen Gong is testing me, right? Okay, I'll try to answer." I took a look at our processing level and felt that it should not be a defect in processing, and Luo Ye's machining ability is still admirable. In terms of materials, there is indeed room for improvement, but now it is far from quenching the thirst of the near. I think the biggest reason is the underestimation of the design load. I heard that this reducer was designed by Chen Gong, but I don't know how the parameters of the stress equation were set when it was designed, and how the grid size was selected when doing finite element analysis. ”

"Finite element analysis ......" Chen Bangpeng was dumbfounded. He had heard of finite elements and knew that they were a good tool for stress calculations, but the problem was that he had never used them. In recent years, some domestic scholars have also begun to use finite element analysis to calculate complex structures such as dams, pressure vessels, and electric fields. Chen Bangpeng also thought about learning this tool so that he could use it in his own research work.

But there is no teacher who understands this technology around, there are some introductions in academic journals, but they are not clear, especially it is difficult to combine with his major, and the development of dump trucks is very intense, so he can only push back and push the plan to learn this method, and he has never been able to pick it up.

Now, Feng Xiaochen directly asked him how the gear system was calculated, and specifically mentioned the meshing problem in finite element analysis, so how could he answer it?

Clearly saying that you don't know how to do finite elements? It is true that at that time, there were not many people in the country who could use the finite element method, and it was not a shame that he Chen Bangpeng would not do it. The problem is that he was pretending to be a cow in front of Feng Xiaochen just now, and now let him admit that he doesn't know this thing, wouldn't he slap himself in the face?

"What, Xiao Feng, do you know finite element analysis?" Wang Weilong asked with some surprise on the side, he, like Chen Bangpeng, is also engaged in technology, and naturally knows the wonders of finite element analysis, but he is also suffering from not finding a teacher who can learn and learn. Hearing Feng Xiaochen talk about finite elements, he suddenly thought that this omnipotent Xiao Feng might really know this trick. As for why he understood, there was no way to explain it, anyway, the unexplainable things on Feng Xiaochen's body were not one or two, and one more was nothing.

"Do you know finite element analysis?" Chen Bangpeng looked at Feng Xiaochen and blurted out: "I don't believe it!" )