The first is the material, which determines the performance of the engine.

Crankshaft, gears, bearings, cylinder liner pistons, piston rings, and engine housing materials.

In terms of materials, China is not a little bit short, nor can it be developed in a short time, so we can temporarily import it and replace it when domestic materials follow up.

We must not compromise on the material issue. Honda and Toyota have successively made promises of a 500,000-kilometer engine warranty, which has greatly boosted their reputation and occupied the two best-selling car brands in the world.

We either don’t do it, we have to meet this standard. We want to make the car rot and our engines are not broken yet.

For various movable and stress-bearing parts of the engine, you need to choose the corresponding types of special steel. You can choose imported Riben Steel, the current Riben Special Steel, the world's number one.

It sounds a shame, but as long as I keep this shame in mind and am willing to make a decision to change, one day we will have our own special steel.

In addition to special steel, the shell material of the engine is not simple, and its material also affects the performance of the engine.

There are two types of engine housing materials, one is aviation-grade aluminum-magnesium alloy material. Its characteristics are light weight, excellent heat dissipation performance, and high thermal expansion coefficient. It is the best quality engine housing material.

Now the world's famous automobile companies also use this material in part, which is generally used on high-end models.

Another type is cast iron material. Don’t think cast iron is bad. On the contrary, the most important components of aerospace engine must use cast iron.

Cast iron has excellent processing properties, high thermal stability coefficient, and is not easy to change shape. It has many advantages and is an important industrial casting raw material.

However, there are several types of cast iron, and the quality varies greatly. They are divided into general cast iron, high-purity cast iron and ultra-high-purity cast iron.

What we need is ultra-high-purity cast iron, which is not available in the world at present. You can find domestic steel factories to jointly develop this material when you have free time in the future.

This material is of great benefit to my country's national defense industry.

Currently we use aluminum-magnesium alloys, which also need to be imported, and domestic materials are not very useful."

While Liu Meijuan was telling, Miao Wei and the other two carefully wrote down a few keywords with their pens, such as "ultra-high-purity iron", "aviation-grade aluminum-magnesium alloy", etc.

"Okay! After talking about the materials, let's talk about the processing technology issue. I will talk about the shell forming process first.

As a high temperature resistant and long-term operation mechanism component, we cannot use ordinary casting technology.

I require a 5,000-ton oil die-casting machine to ensure that the shell can withstand extremely harsh working environments.

Anyone who has studied physics knows that the same material will form several completely different atomic structures due to different temperature and pressure. The substance has not changed, but the performance varies greatly.

Perhaps after hot casting, you should also pay attention to the heat treatment process. The performance differences between each product are actually in these small details.

The moving parts and stress-bearing parts inside the engine are all machined and cut. We have three imported five-axis linkage machine tools, which will not be weaker than those of European and American automobile companies in terms of cutting process and precision.

However, some important parts may also require tuning and tempering, such as bearings, gears, crankshafts, etc. You need to compare and experiment.

Details determine success or failure. I said you should be prepared for a long time. These inconspicuous details are often not overlooked by us Chinese.

In short, every time you make a part, you must compare it with similar foreign products. In terms of mechanical properties, durability, and heat resistance, you must be no less weak than similar foreign products.

The last problem with the processing technology is precision. Automobile engines are the equipment with the worst working conditions, so the more precise the better. It has a poor workmanship, which is the clearance.

You have no experience, and if you go to experiment one by one, you will waste a lot of time and money.

One way I tell you is to see the labor difference between other automobile engine parts. You have to see each one, and look at several companies, and then do experiments to form our own labor difference standard for parts."

Liu Meijuan systematically talked about the two key elements of materials and craftsmanship, which benefited Miao Wei and the other two very much. In particular, she focused on details to determine success or failure. In terms of material processing technology, the three were thorough laymen. After this teaching, they had learned the essence of industrial victory.

Indeed, the advantages and disadvantages of the machinery industry are to put it bluntly, these details are handled. This is a technical summary of Europe and the United States for hundreds of years, and it is a secret that no one can tell them about.

There is no shortcut to take this, only stricter than others' requirements, and constantly experiment and summarize, one day, the backwards will catch up and surpass the advanced. This is how the Japanese stupid Korean stick came through.

Why did Liu Meijuan set such a high standard from the beginning? She just didn’t give herself the opportunity to slack off. Only by having high standards and high starting points can she truly forge the soul of China’s industrial soul.

"Okay! After talking about the two key elements of materials and process, I will talk about my technical requirements for this 0.9-liter inline three-cylinder engine.

First of all, it must be a new technology engine, and it must be a direct injection in the fuel common rail cylinder..."

"etc"

As soon as Liu Meijuan popped up a new term, Miao Wei called her out.

"Boss, we have never heard of this technology, please explain it to us."

"This is a technology derived from a diesel engine, organically combining the advantages of diesel engines with gasoline engines.

Diesel engines are high-pressure plunger rods for fuel injection. Their strength is determined by the engine speed and are inconvenient for electronic technology to control.

Therefore, we can use solenoid valves and use pulse signals to control them, which can more accurately adjust the fuel injection volume.

For example, when going up a steep slope, the engine may not rotate enough, but at this time it requires more fuel, which makes the engine generate more torque and allows the vehicle to easily deal with various complex road conditions.

For example, when a vehicle is driving at high speed, it does not require too much fuel, so we can use preset programs to solve the fuel injection amount to achieve the purpose of energy conservation and emission reduction.

Direct injection in the cylinder, as the name suggests, is to use a high-pressure nozzle to directly inject gasoline into the cylinder. The advantage of this is to save the electronic ignition system.

You all know that the ignition point of gasoline is far lower than that of diesel, so the heat generated by piston compression is enough to ignite gasoline, so that the complex electronic ignition system is unnecessary.

However, you should pay attention to some points. Because the ignition point of gasoline is too low, we must use the method of setting temperature sensors and pressure sensors in the cylinder to accurately spray the gasoline into the cylinder at an appropriate time.

In addition, more than two nozzles should be set up for each cylinder so that the gasoline is thinly distributed in every corner of the cylinder, or the lower part is slightly thicker and the upper part is slightly thinner. The thick one is first ignited, and then the lean gasoline combustion can achieve the same complete combustion. This is called layered combustion technology.

Yes! It is to burn completely. We must let every drop of oil burn fully so that the combustion efficiency can be maximized and the car will be more fuel-efficient.

Having said that, I must remind you that in addition to our own efforts, another key factor is fuel quality.

The quality of fuel in China is exactly the worst, with high impurities and high hydrocarbon aromatic substances, which makes the lead content of gasoline exceed the standard.

Long-term use of this gasoline will not only affect the performance of the engine, but also damage the engine life..."
Chapter completed!