The excavator is more difficult to manufacture is the 360-degree hydraulic rotation mechanism, the same as the headset, but the energized part is changed to a hydraulic channel.

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

Many parts do not need to be forged in modern times using casting technology, but at the current level of working conditions, secondary processing after forging is the best choice.

Although this is more troublesome and costly, it is the best solution.

The parts of the boring machine are housed in a single room and on a large wooden table.

Equipment assembly, until now it is a little better, some high-precision equipment in later generations, there is a temperature demand when assembling, that is, how much temperature the part has to reach before assembly.

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

This has a demand for parts processing, you dismantle other people's machines, and then install them back to achieve the original accuracy, on the one hand, there are reasons for the reduction of the accuracy of the equipment dismantling, and the second is that the assembly process is kept secret.

Assembly parts of different temperatures, in the parts manufacturing needs are different, metal parts at different temperatures have a thermal expansion and contraction coefficient, the parameters of each part are different according to the different temperatures when processing.

Maybe you are measuring the parameters of the parts at the temperature in use, but you manufacture according to this parameter, and you can't reach the original parameters at all, that is, there is a little less of the thermal expansion and contraction coefficient of different temperatures.

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

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

"This is especially important when assembling."

Liu Hai led Li Dali and the three of them to assemble the boring machine, the whole boring machine looks similar to the one in the factory, Li Dali is already very impressed with the bangs, but the three of them saw the bangs test the motor, and the sound of this motor can be heard is not ordinary.

The four of them were busy all day, and finally assembled the boring machine.

The motor starts, listens to the sound problem, and then continues to start, the gearbox is no problem, and the bangs take out a cast and rough-machined cylinder liner, the parameters of this cylinder liner are the engine cylinder liner of Sun Aiguo Willis off-road vehicle.

As long as Liu Hai processes all four cylinder liners, then Sun Aiguo's car can be driven for a long time, and it will not be three days and two ends.

Bangs feel very stable, better than the rest of the factory, and the tool itself has been improved, in strict accordance with the parameters of the feed, some processing is eager to put a knife in place, anyway, the equipment is not their own, because it is piecework.

"Three of you, one for each person, come and try it." Bangs machined a cylinder liner and had the other three try it out.

The other three hurriedly came up, one operated, and the other two craned their necks to watch.

Liu Hai didn't go back to the courtyard again, because there was heating in the laboratory, that's right, Sun Aiguo heated the laboratory, and the boiler room also burned.

Liu Hai went back to the dormitory to sleep by himself, regardless of Li Dali and the three of them, the three of them were excited, and now let them come back to sleep, but they can't sleep.

In the north in winter, Liu Hai didn't want to go out at all, so he looked at the factory director's car, just changed the cylinder liner, and drove back to the village when the time came, which was much safer than other three-wheelers.

Li Dali and the three of them came back to sleep in the early morning, and the next day the bangs got up, and the three of them also got up.

Liu Hai looked at the cylinder liner processed by Li Dali and the three of them, and carefully checked it, no problem.

Then Liu Hai drove Sun Aiguo's car over, and the factory director didn't like his car very much recently, mainly because there were many problems.

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

After Sun Aiguo heard about it, when he came to the laboratory, he saw that the engine of his once beloved car had been hoisted out.

After Sun Aiguo heard about it, when he came to the laboratory, he saw that the engine of his once beloved car had been hoisted out.

"Huh?" Sun Aiguo saw that he was changing the cylinder liner.

"The boring machine is ready?" Sun Aiguo understood at once.

Bangs nodded on the side: "I assembled it yesterday afternoon, isn't this just the right time to try it." ”

"I'll take a look." Sun Aiguo didn't look at his car anymore, and went into the laboratory by the way, Sun Aiguo came a few days ago and saw that there were parts inside.

Looking at the boring machine, Sun Aiguo felt a breath of anger 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 Kyoto Motorcycle Factory, is this a breath?

"Director, I have made a small change to the motor, the gearbox has also been changed, the bearing has also been changed, and the other is the tool, mainly the heat treatment process."

"Personally, I think this kind of equipment is best made in one factory, which is conducive to confidentiality."

Sun Aiguo nodded, the heat treatment process is a big doorway, and now the top and bottom of the machine department are very important to the confidentiality of technology, and no longer feel that their technology is backward, after all, the motorcycle makes money.

In the past, the reason why I didn't pay attention to it was mainly because I thought that 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 listen to the command, no problem." Bangs are immediately guaranteed.

"This one will be on your side." Sun Aiguo actually knew the answer, but Liu Hai's affirmative answer still made Sun Aiguo enjoy it very much.

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

"Factory director, your car has been repaired, how about I drive it when I go back to my hometown?" Bangs nodded and asked.

Sun Aiguo nodded: "No problem." ”

When Liu Hai was chatting with Sun Aiguo, the workers were resting in the rolling mill opposite.

"What do you think this motorcycle factory is doing with such a big forging?" Looking at the rough forged embryo, many workers didn't recognize that it was a thing.

In fact, this is the boom of an excavator, why is the boom of a modern excavator broken, I really think it can't be made better.

Of course not, the margin is very small when designing and manufacturing, you buy 90 and do 90 work, you have to do more, then I will show you.

And you constantly, how do I sell accessories, metal fatigue or something has already been designed for you, and when it comes to the number of uses, give me a break.

The margin of bangs design is very large, and it can be said that it can be used for decades, which is why many old-fashioned excavators can be used for decades, but the new ones are not durable? It's because of the design and manufacturing problems that force you to change parts for new cars.

Sun Aiguo watched Liu Hai and several people replace the engine liner of their car, then check it, assemble the engine, and then stuff it back into the car.

After the ignition started, Sun Aiguo got into the car and tested: "Tut, it's even better than when I just got it." ”

(End of chapter)