Courtyard light

Chapter 197 Getting into the car (Part [-])
What is more difficult to manufacture in an excavator is the 360-degree hydraulic rotation mechanism. The principle is the same as that of the headset, except that the powered part is changed to a hydraulic channel.

Liu Hai first took out some drawings of parts of the excavator that needed to be forged and sent them to the rolling mill.

Many parts use casting technology in modern times, so forging is not required, but under the current working conditions, secondary processing after forging is the best choice.

Although this is more troublesome and consumes manpower and material resources, it is the best solution.

The various parts of the boring machine are placed in one room and placed on a large wooden table.

Equipment assembly is better now. Some high-tech equipment in later generations has temperature requirements during assembly, that is, how high the temperature of this part must be before assembly.

It is not a simple constant temperature factory, but different parts and different temperatures, and finally combined closely together.

This creates a demand for parts processing. If you dismantle someone else's machine and put it back together, the original accuracy will not be achieved. On the one hand, there is a reason why the accuracy of the equipment is lowered once the equipment is dismantled, and the second is that the assembly process is kept secret by others.

Assembled parts at different temperatures have different manufacturing requirements. Metal parts have thermal expansion and contraction coefficients at different temperatures. During processing, the parameters of each part vary according to the temperature.

Maybe you are measuring the parameters of the parts at the temperature used, but if you manufacture according to this parameter, it will not reach the original parameter at all, that is, the coefficient of thermal expansion and contraction at different temperatures is missing.

Of course, the one made by Liu Hai just needs to be assembled at the same temperature, it doesn't need to be so complicated.

"Metals have different thermal expansion and contraction coefficients at different temperatures, so they must be taken into consideration when designing."

"It is even more important to pay attention to this when assembling."

Liu Hai led Li Dali and three people to assemble the boring machine. The whole boring machine looked similar to the one in the factory. Li Dali admired Liu Hai very much. But the three of them saw Liu Hai testing the motor, and the sound of this motor could be heard to be unusual .

The four people worked hard all day and finally assembled the boring machine. When testing the machine, Liu Hai asked a few people to get out of the way.

The motor started, heard the sound problem, and then continued to start. The gearbox was no problem. Liu Hai took out a cast and rough-machined cylinder liner. The parameters of this cylinder liner were the engine cylinder liner of Sun Aiguo's Willis off-road vehicle.

As long as Liu Hai processes all four cylinder liners, then Sun Aiguo's car can still be driven for a long time, and it won't be lying on the ground every three days.

The bangs feel very stable, better than others in the factory, and the tool has been improved by itself, strictly following the parameters of the tool feed. During some processing, I wish I could hit the spot with one cut. Anyway, the equipment is not my own, because it is piece-rate.

"There are three of you, one each, let's give it a try." Liu Hai processed a cylinder liner and then asked the other three to test it.

The other three people hurriedly came up and performed one operation while the other two craned their necks to watch.

Liu Hai didn't go back to the courtyard because there was heating in the laboratory. Yes, Sun Aiguo had heated the laboratory and the boiler room was burning.

Liu Hai went back to the dormitory to sleep by himself, regardless of Li Dali and the other three, the three of them were excited, and now they were asked to come back to sleep, but they couldn't fall asleep.

In the north in winter, Liu Hai didn't want to go out at all, so without Liu Hai, he looked at the factory manager's car, just changed the cylinder liner, and drove back to the village by himself, which was much safer than other three-wheelers.

The three of Li Dali came back to sleep in the early morning, and when Liu Hai woke up the next day, the three of them also woke up.

Liu Hai looked at the cylinder liner processed by Li Dali and the others, and checked it carefully. There was no problem.

Then Liu Hai drove over Sun Aiguo's car. The factory director didn't like his car very much recently, mainly because it had many problems.

But it doesn’t mean that anyone can wear it, of course bangs are an exception.

After Sun Aiguo heard about it, he came to the laboratory and saw that the engine of his once beloved car had been lifted out. "Huh?" Sun Aiguo noticed at a glance that he was changing the cylinder liner.

"Has the boring machine been made?" Sun Aiguo understood immediately.

Liu Hai nodded on one side: "I assembled it yesterday afternoon, why don't I give it a try."

"I'll go take a look." Sun Aiguo stopped looking at his car and turned into the laboratory. Sun Aiguo had been here a few days ago and saw parts inside.

Looking at the boring machine, Sun Aiguo felt angry in his heart. What anger?

That is, the nameplate of this boring machine can be changed to all Chinese, and there are a few words made by Jingdu Motorcycle Factory. Is this a rush?

"Director, I made some small changes to the motor, the gearbox, the bearings, and the cutting tools, mainly the heat treatment process."

"I personally think it's best to have this kind of equipment manufactured in one factory. This will help keep it confidential."

Sun Aiguo nodded, the heat treatment process has become more sophisticated, and now the Ministry of Machinery and Machinery Department is very important to keep the technology secret, and no longer feel that their technology is backward, after all, motorcycles are making money.

The reason why I didn't pay attention to it before was mainly because I thought my technology was the most rubbish, but now that I have a beginning, I will naturally pay attention to it.

"Energy production?"

"As long as you follow the instructions, there's no problem." Liu Hai immediately assured.

"This one will stay with you." Sun Aiguo actually knew the answer, but Liu Hai's affirmative answer still made Sun Aiguo enjoy it.

"Then I will immediately organize people to set up a workshop, all of whom are old people from our factory. Your technical guidance will lead to mass production as soon as possible."

"Director, your car has been repaired. How about I drive it when I go back to my hometown?" Liu Hai nodded and asked.

Sun Aiguo nodded: "No problem."

While Liu Hai was chatting with Sun Aiguo, workers were taking a rest in the steel rolling mill opposite.

"What do you think this motorcycle factory does with such large forgings?" Looking at the rough forgings, many workers didn't recognize what they were.

In fact, this is the boom of an excavator. Why did the boom of a modern excavator break? I really thought it couldn’t be done better.

Of course not, the margin is very small when designing and manufacturing, if you buy a 90, you can just do the work of 90, if you want to do too much, then I will stop it for you to see.

And you keep on, how do I sell accessories, metal fatigue and so on have already been designed for you, and when the number of uses is reached, stop it for me.

The bangs design has a large margin and can be used for decades. This is why many old excavators can still be used after decades, but the new ones are not durable?It is because of design and manufacturing problems that you are forced to replace parts and buy a new car.

Sun Aiguo watched Liu Hai and others put on the engine cylinder liner of their car, then checked it, assembled the engine, and stuffed it back into the car.

After starting the ignition, Sun Aiguo got into the car and tried it out: "Tsk tsk, it's even better than when I just got it back then."

(End of this chapter)