Time passed like this, and finally after more than a month of promising Master Zhang, the drawings of the diesel engine of more than 500 kilowatts were almost drawn, in fact, this design was very brain-consuming for Li Zhao.

We all know that there are three main factors that affect the development of engines, one is the design ability, one is the ability to process and manufacture, and the other is the performance of the material. For Li Zhao, there is no problem with design ability and material performance now, but the ability of processing and manufacturing has become an obstacle that restricts Li Zhao's performance.

It's very simple, the machining accuracy of this era is too poor. At present, only the material problem has been solved, and it will take a long time to solve the processing problem. For Li Zhao, it is easier to design a high-horsepower and high-precision diesel machine, and this kind of high-horsepower engine with low machining accuracy and relatively small size is the biggest trouble. There is no way, there are too few things to choose from.

Why? In fact, the importance of machining accuracy is very easy to understand, and the biggest reason why the machine will have a lot of vibration during operation is because of the imbalance of parts in the operation process. The biggest reason for this situation is that the structural design of the part itself is problematic and the accuracy is insufficient. Obviously, there is no possibility of structural problems, and what can lead to this problem is machining accuracy.

To give the simplest example, is the gyroscope, if the precision of the gyroscope processing is very high, when rotating, the amplitude of the gyroscope swing will be very small, and when we add a little weight to one side of the gyroscope, the gyroscope will be very easy to swing, which is especially obvious in the performance of the running equipment.

We all know what are the factors that can affect the horsepower of the engine, and if you want to achieve high horsepower, you must find a way to do it on these factors. Li Zhao carefully studied the tank engine drawings that Division Commander Zhang brought back, and if improvements were made on the basis of this engine, it would basically be necessary to increase the performance by 30%.

Historically, the method used was to use turbocharging, which increased the performance by about 40%, so it is possible to directly achieve a leap in performance by directly using turbocharging. But the current situation is that after the use of turbocharging, the structure of the engine will become more complex, and the requirements for machining accuracy will be higher.

And in this process, basically all parts need to be hand-polished by fitters of the eighth level, otherwise it is basically impossible to achieve this performance. Li Zhao has a strong ability to optimize machinery, but now he has no processing ability, except for manual polishing in place, there is really no good way.

As for the higher temperature, pressure, etc., after using turbocharging, there is no problem. Very simply, Li Zhao is most sure of the material now, but he is the least confident in the machining accuracy. If the machining accuracy cannot be reached, the consequences are very simple, that is, the vibration is large, the noise is large, and it is easy to break.

In such a situation, Li Zhao obviously can not use turbocharging, of course, after the mass production of various machine tools in the coming year, it is estimated that this problem can be solved very well, and it is also the time for Li Zhao to really promote the engine project. And now this can only be said to be an excessive model, and there is no way that Master Zhang is too anxious.

But there are also benefits to thinking about it, with a larger horsepower engine, you can also speed up the development of new tanks, an engine of more than 500 kilowatts, then it is still possible to use it as a tank of more than 40 tons. And when the new machine tools come out, Li Zhao also plans to design a tank and fight them in the ring when the time comes. After the turbocharger was killed by Li Zhao, Li Zhao started other calculations.

For an engine, the easiest way to increase power is to increase the number of cylinders, but this is obviously not possible here, and this will greatly increase the engine size. The current situation is that the size can be reduced, but not increased, and it is too large to fit in. Of course, this method is also the most effective way, to increase the power of thirty percent, only need to change the original twelve cylinders into sixteen cylinders, but now it is obvious that it can only be killed.

The second method is to directly increase the bore, the larger the bore, the more gas will be inhaled, the more diesel can be injected, and the more heat can be released from combustion. After Li Zhao studied the situation of the drawings, in the case of all new materials and no change in the overall size, the bore can only be increased to about 160 mm at most, that is to say, in this case, the performance can be increased by 13.8% at most, which obviously cannot meet the requirements of more than 500 kilowatts, but can be used as a supplementary method.

Another way to do this is to increase the piston stroke, which would allow you to draw in more gas and increase the pressure of the gas at the same time, but this would obviously increase the size of the engine, and all of this would have to be eliminated without any need to think about it.

In the end, Li Zhao found that it is difficult to greatly improve the performance of the engine by other methods, especially to increase the cylinder bore, which can only be achieved by reducing the wall thickness of the cylinder.

That is to increase the speed of the engine, this way can better achieve Li Zhao's requirements, only need to increase the speed of the engine by three percent, to reach 2,600 revolutions per minute, you can directly achieve this goal. But Li Zhao knows very well how high the accuracy requirements for engine parts are at this speed, which is basically impossible to achieve in the current situation.

In this case, it is better to directly change to turbocharging, which is the direction of future engine research. If the engine wants to achieve high horsepower in the future, it must be turbocharged, and if the processing difficulty is comparable, then turbocharging can really be considered directly, after all, other things will not be of much significance in the future.

Therefore, considering the current machining accuracy, it is obvious that a single method cannot meet Li Zhao's needs. After some calculations, Li Zhao chose two methods: increasing the bore and speed. However, in order to reduce the difficulty of machining, Li Zhao set the number of revolutions at 2,400 revolutions per minute, and the cylinder bore was set at 158 mm.

Coming to the company, saying hello, Li Zhao rushed to the material factory, and saw Master Zhang, Li Zhao handed over the drawings to him, and introduced: "This engine is improved on the basis of the original tank engine, the main method is to increase the speed of the engine, the selection of new materials, but there are many requirements for processing accuracy and other aspects." Many parts don't vary much in size, but these parts are not universal. ”

At this time, Division Commander Zhang asked: "Then how much horsepower can this horse reach, and how many tons of tanks is it suitable for?" ”

Li Zhao replied at this time: "Now, it should be about five hundred, and two main changes have been made, one is the cylinder bore, which has increased by about 11 percent, and the other is the speed, which has increased by 20 percent. I have made some optimizations to the whole mechanical part, mainly to reduce vibration and noise, but I have also put forward new requirements for machining accuracy, so now I will make do with it. ”

When Master Zhang heard this, he couldn't help asking: "In this case, will it affect production, if it can't be produced, I will trouble you at that time, but you and I promise that it can be mass-produced." ”

Li Zhao heard Master Zhang's words and said with a smile; "Of course it can be produced, I designed it with reference to the accuracy of the equipment in the military factory, and there should be no problem with the production, but I think the output should be very stretched, if you don't get the equipment we newly designed, it should be quite fast for them to produce ten units per month."

When Master Zhang heard this, he was not satisfied and said; "This yield is too low, what is enough?"

Li Zhao was also quite speechless at this time, this one didn't understand technology at all, and Li Zhao could only explain patiently to him: "Uncle Zhang, I have fully considered their processing difficulty, so I designed it so much, if the machining accuracy can reach one micron, believe it or not, I will directly give you the whole engine of more than 1,000 kilowatts?" ”

"This design can be said to be the most brain-burning design I have ever had, and I need to fully consider the processing ability. The precision of the design is too high, and it will not be mass-produced immediately, but the accuracy is too low, and the horsepower reaches this level, and the noise and vibration will be too great, and it is estimated that the sound of speech will not be heard in the car. "Eight One Chinese Net

Division Commander Zhang was also a little embarrassed when he heard Li Zhao's complaint, there was no way he didn't understand technology, looking at the drawings, Division Commander Zhang said: "Why don't we go to the military factory together and let them try production?" "Master Zhang is not at ease now, after all, he didn't see the real thing, and Li Zhao was ruthless enough, which directly increased the motivation of Sancheng.

When Li Zhao heard this, he also said; "Yes, I've already said hello to the factory today, and it doesn't matter if I don't show up for a day today. It just so happened that I also wanted to go to the military factory to have a look, and I don't know how their tank guns and 155-mm howitzers are being researched. What's more, the hydraulic press is also being produced here, and since the drawings were issued, Li Zhao has not been available to see the situation until now. ”

"Brother Shen!"

"Hmm!"

Shen Changqing walked on the road, and when he met someone he knew well, he would say hello to each other or nod his head.

But it doesn't matter who it is.

There was no superfluous expression on everyone's face, as if they were very indifferent to everything.

on this.

Shen Changqing is used to it.

Because this is the Demon Suppression Division, it is an institution that maintains the stability of Great Qin, and its main responsibility is to kill demons and monsters, and of course there are some other side jobs.

Arguably.

In the Demon Suppression Division, everyone has a lot of blood on their hands.

When a person is accustomed to seeing life and death, then he will become indifferent to many things.

When he first came to this world, Shen Changqing was a little uncomfortable, but over time he got used to it.

The Demon Suppression Division is huge.

The people who can stay in the Demon Suppression Division are all powerful masters, or people who have the potential to become masters.

Shen Changqing belongs to the latter.

Among them, the Demon Suppression Division is divided into two professions, one is the town guard and the other is the demon exterminator.

Anyone who enters the Demon Suppression Division starts with the lowest level of demon slayer.

Then step by step, he is expected to become a town guard.

Shen Changqing's predecessor was a trainee demon slayer in the Demon Suppression Division, and he was also the lowest level of the demon slayer envoys.

Have memories of the predecessor.

He is also very familiar with the environment of the Demon Suppression Division.

It didn't take long for Shen Changqing to stop in front of an attic.

Unlike other places full of slaughter, the attic here seems to stand out from the crowd, and in the bloody Demon Suppression Division, it presents a different tranquility.

At this time, the attic door is open, and there are occasional people entering and exiting.

Shen Changqing only hesitated for a moment, and then stepped in.

Access to the attic.

The environment has changed in vain.

A burst of ink fragrance mixed with the faint smell of blood came to his face, making his brow furrow instinctively, but quickly stretched.

The smell of blood on everyone's body in the Demon Suppression Division is almost impossible to clean.