Chapter 197 Getting Into the Car (First Update)
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 the drawings of some parts of the excavator that needed to be forged and sent them to the steel rolling mill.
Many parts use modern casting technology and do not require forging. However, under 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 a room and placed on a large wooden table.
Equipment assembly is a little better now. Some high-precision equipment in later generations have temperature requirements during assembly, that is, what temperature must the part reach before assembly.
It is not a simple constant-temperature factory building, but different parts have different temperatures and are finally closely combined.
This creates a need for parts processing. If you dismantle someone else's machine and put it back together, it won't be able to achieve the original accuracy. On the one hand, the accuracy is reduced once the equipment is dismantled, and on the other hand, the assembly process is kept confidential.
Assembly 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 are also different depending on the temperature.
Maybe you are measuring the parameters of the parts at the operating temperature, but if you manufacture them according to these parameters, they will not reach the original parameters at all, that is, there are some missing coefficients of thermal expansion and contraction at different temperatures.
Of course, the one made by Bangs just needs to be assembled at the same temperature, and it doesn't need to be that complicated.
"Metals have different thermal expansion and contraction coefficients at different temperatures, so they must be taken into consideration when designing."
“You need to pay more attention to this when assembling.”
Liu Hai led Li Dali and three others to assemble the boring machine. The entire boring machine looked similar to the one in the factory. Li Dali was already very impressed with Liu Hai. But when the three of them saw Liu Hai testing the motor, they could tell that the sound of the motor was 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, Sun Aiguo's car can still be driven for a long time without having to lie down every two 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 get it right 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. He didn't care about Li Dali and the three of them. The three of them were excited. Now if they come back to sleep, they can't fall asleep.
In the north in winter, Liu Hai didn't want to go out at all, so Liu Hai turned his attention to the factory director's car. He just changed the cylinder liner and drove it back to the village. This was much safer than other three-wheelers.
Li Dali and the other three came back to bed early in the morning. When Liu Hai got up the next day, so did the three of them.
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 also the words "Made by Kyoto Motorcycle Factory". Is this an outrage?
"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. Now everyone in the First Machinery Department attaches great importance to the confidentiality of technology. They no longer feel that their technology is lagging behind. After all, motorcycles make money.
The reason why I didn't pay attention to it before was mainly because I thought my own technology was the most rubbish, but now that I have a starting point, I will naturally pay attention to it.
"Is it energy productive?"
"As long as you follow the command, there will be no problem." Liu Hai assured immediately.
"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. They are all old people from our factory. You will provide technical guidance and 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 big arm of an excavator. Why is the big arm of a modern excavator broken? I really thought it couldn't be made better.
Of course not. When designing and manufacturing, the margin is very small. If you buy a 90% model, just do the 90% work. If you want to do more, then I will show it to you.
And you keep asking me how to sell accessories. The metal fatigue and other issues have been designed for you a long time ago. When the number of uses is reached, cut it off.
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: "Tsk, tsk, it's even better than when I first got it."