"In the production process, our cylinder block processing accuracy is not enough." Facing the three engines that were disassembled, Zhang Baolin said: "Take the engine with the cylinder gasket as an example, the flatness of the cylinder block plane is not enough.
, it should be below 0.01 mm, and now, the flatness is 0.03 mm. So, it caused the incident of the jar gasket to happen."
After hearing Zhang Baolin's words, many people present expressed dissatisfaction.
"Lao Zhang, this engine is produced in the diesel workshop of our first machine factory. We are completely based on modern technology. According to technical data, as long as our flatness reaches the error standard of 0.03 mm, it is qualified. You are like this.
To say, it is clearly nitpicking.”
During manufacturing, error is a very critical project. Any mechanical processing equipment has error standards, and the engine is no exception.
The main body of the engine is the body, which is cast. After casting, the only thing that comes out is a blank. This blank must be placed on the machine tool for precision processing.
The top of the cylinder block is to contact the cylinder head. The two work together to seal the cylinder. If the cylinder block is not flat during processing, then there will be a certain amount of gas during the engine operation, from the cylinder block and
The cylinder gasket sealed between the cylinder heads rushes out, and this is the cylinder gasket.
Now, Zhang Baolin made this suggestion, but when he put it forward, Wu Ruihua was not satisfied.
What is the error in flatness? This is related to the material and structure of the engine. The six-cylinder engine with cast iron cylinder block cannot exceed 0.03 mm; the four-cylinder block cannot exceed 0.02 mm; if it is replaced with aluminum alloy
The requirements for the cylinder block are relaxed. The six-cylinder cannot exceed 0.5 mm, and the four-cylinder must not exceed 0.3 mm. Of course, this is because aluminum is softer than iron, so although the error is large, the cylinder gasket is added and tightened.
After that, it will be enough.
Now, the tank engine they made, which is twelve cylinders, has become a V-shaped structure with six cylinders on one side. Therefore, according to the standards of six-cylinder engines, the smoothness of the processing shall not exceed 0.03 mm.
The error is enough. Now, Zhang Baolin actually proposed to reach 0.01. Wu Ruihua has been working on the engine for so many years, but he has never heard of this standard.
The smaller the error, the better. As long as the usage standards are met, that is enough. If you deliberately emphasize how low the error is, then a problem will be raised that the processing cost will increase. Now the cost of the new tank is no longer low.
If you are nitpicking, the high price of the products you make will affect the number of equipment of the troops.
"Lao Wu, don't look at the new problems now with old ideas." Zhang Baolin said: "You are talking about the previous standards. In the past, how high the pressure inside our engine was, and how high is it now? For the sake of our sake, we
The power of the pressing engine and the pressure during internal combustion are several times higher than before! Therefore, the previous engines were enough to process 0.03 mm, but now it is not possible. It must be ground more precisely so that it can avoid the occurrence of
question."
There was no problem with the initial prototype car, because it was built with excellence. Now, when it comes to the production line, it starts to produce in large quantities, and the quantity is the focus. At this time, standards are crucial.
Is it enough to have a processing error of 0.03 mm, or must it be accurate to 0.01 mm? Perhaps this is just a trivial matter, but in fact, it is a question of whether the entire system standards need to be changed.
The current engine is different from the previous engines. Its continuous squeeze potential has been more than doubled from the initial 500 horsepower to the current 1,200 horsepower, and the pressure inside the cylinder has also been greatly enhanced.
So, the required processing accuracy should be higher accordingly!
"Do you think you know how to keep pace with the times?" After hearing Zhang Baolin's words, Wu Ruihua did not give in: "When the accuracy reaches a certain level, it is meaningless to continue to improve. This time, the gasket may be
It's just an accident. For example, if you don't tighten it in order during assembly, it may be that the quality of the cylinder gasket is not up to standard, so just change it?"
Wu Ruihua also has his own reason. After the accuracy reaches a certain level, it is no longer meaningful to continue to improve, because there is no need to do so.
After hearing Wu Ruihua's words, Zhang Baolin was not angry, but said, "Okay, since that's the case, let's take a look at the foreign standards. Do you have foreign processing accuracy standards?"
Hearing this, Wu Ruihua shook his head. There was indeed nothing.
Although the first machine factory also manufactures engines, they are all tank engines. The first machine factory's automobile branch is only assembled. The engines are provided by brothers. There are domestic Steyr, Deutz air-cooled diesel engines, and there are also direct
Mercedes-Benz engine imported from Germany.
"I suggest you can disassemble an engine imported from Germany and measure the cylinder flatness of the German engine." Zhang Baolin said.
"You can just dismantle it?" Wu Ruihua was still a little dissatisfied. Do you know how expensive those engines are? Will customers still want them if they are dismantled?
"Try to dismantle one." At this moment, Qin Zhenhua spoke: "Master Wu, practice is the only criterion for testing the truth. Let's take apart one and take a look. We will not only dismantle the engines of their commercial vehicles
, and we also need to dismantle a German MTU engine to see."
Qin Zhenhua is very cautious, and at the same time, these standards are also very important. When no one can convince anyone, just use the facts to see how the West does it.
The next day, the results of the measurement were disassembled and transmitted to the test site. Everyone looked at the measured data and looked ugly.
Sure enough, it's 0.01 mm!
Even commercial vehicles in Europe are constantly developing technology, just like Mercedes-Benz engines. Ordinary commercial vehicles already have a 500-horsepower engine to provide. You know, this has the same power as the 59 tank engine.
Yes, while the 59 tank engine needs to be overhauled after five hundred hours of driving, the engine of this kind of commercial vehicle can be at least 10,000 hours, which is a huge gap.
At the same time, the fuel consumption is also quite low.
When it comes to engine technology, it is still advanced in the West, so if you want to catch up, you need to unify the standards with them. When you saw this result, Wu Ruihua just thought for a moment and said, "Okay,
I was wrong. In the future, our processing accuracy will be improved to 0.01 mm."
Since you know you are wrong, you will admit it openly, which is Wu Ruihua's attitude.