The night is silent, the cool night breeze blows on the face, making people feel a burst of comfort, spring returns to the earth, everything recovers, and a machine factory has ushered in a new era of vitality.

Qin Zhenhua walked on the road of the factory, looking at the grass and trees in the factory, full of confidence in the future, building tanks, building the world's most advanced tanks, this is already his greatest expectation, he will fight for this cause for life!

"Zhenhua, today's report is good." At this moment, Huang Lao, who was beside him, spoke: "Tomorrow, Zhang Lao is going to the Second Machine Factory to have a look, so let's go with him." ”

Second machine factory? Qin Zhenhua looked at Huang Lao strangely, not knowing what he wanted to express.

The Second Machine Factory, mainly for making artillery, since Zhang Lao came to Grassland City, it is impossible to only inspect the First Machine Factory, the Second Machine Factory, and even the Iron and Steel Factory, may go over to have a look, but does this need to be accompanied by himself?

"The issue of caliber selection of our tank guns was originally entrusted with this task, so we have to prepare a report, which may be used tomorrow." Huang Lao said to Qin Zhenhua.

Hearing the news, Qin Zhenhua immediately became excited: "Yes." ”

The engine is clapping, the tank gun, is it also going to be clapper?

As for the caliber selection of tank guns, Qin Zhenhua has the right to speak, after all, the original advanced shells were the first to be made up by him, and later at the meeting, everyone argued endlessly and couldn't come up with a conclusion, so in the end, it was first regarded as a legacy project and handed over to Qin Zhenhua to do an analysis report.

Now, a lot of specific materials have been written, sorted out, and published tomorrow!

It looks like it's going to be a sleepless night.

The next day, the second machine factory.

"This is the electroslag remelting plant we brought in from Austria." Standing in front of the huge device, Xie Huimin's face was also filled with bursts of excitement, and he introduced to Zhang Lao, and even his voice seemed to be trembling.

"If you want to make a cannon, the quality of the steel must be good, in the past, our cannon steel, the performance is insufficient, in order to ensure the chamber pressure, you can only use a thicker barrel, but now, we have created a 105 mm tank gun, than the 100 mm tank gun, the weight is more than 30 percent lighter, this is the benefit of advanced technology."

At this time, the electroslag remelting furnace is being refined, and the ingots are melted again, and the slag floats on the molten steel all the time, realizing the re-refining of the ingots.

"In addition to being used to make cannons, the steel ingots after electroslag remelting, due to their good quality, can be used to manufacture various metal parts, and can even be directly forged by casting, simplifying the production process and improving the utilization rate of metal. For example, the piston in the current Panther engine of the first engine factory is made of our electroslag remelted steel. ”

Speaking of this, Xie Huimin's face was filled with a proud smile, and his words also stunned many people.

What the? In that Panther engine, a cast steel piston is used?

The piston of the engine, made of steel, is generally used by low-level engines, in order to save costs, and high-end engines have begun to use aluminum pistons, aluminum pistons are light in weight, and the inertia is small in the process of reciprocating motion, so it is very suitable for engine use, especially those high-speed engines.

As for steel pistons, in addition to low cost, what are the benefits?

Of course, there are benefits, ordinary steel, must be low cost, but this electroslag remelted steel, the cost is not low! Moreover, the use of a steel piston can naturally improve the strength of the piston!

If you want to achieve the increase in power, it must mean that the combustion inside the engine is more hot, the aluminum piston, which is more likely to deform at high temperatures, the steel one is different, and the pressure under it, the steel one is stronger.

In order to improve the power of the engine, it is not to change back to the steel piston, which is not to reverse the history, and in later generations, there is also this technical route.

At that time, Dongfeng Tianlong heavy trucks applied Renault's DCI engine, which was divided into different horsepower, 340, 375 and 420 horsepower, etc.

Among them, the DCI375 engine has had a lot of problems, and after a few months of use, the top of the piston cracks!

This is because it directly uses the aluminum piston of the 340 engine, on the 340 engine, there is no problem, and on the 375 engine, with the increase of power, it causes the piston to be unable to withstand the pressure, and the 420 engine has never appeared, because this engine is more powerful, the designer knows that the aluminum piston can not withstand it, so when it leaves the factory, it is the piston with a steel top aluminum skirt.

Of course, with the technological progress of that era, the steel piston, in fact, is not the right name, this is a composite scheme, the top bears the strong gas impact inside the cylinder is steel, and the following in order to reduce the mass, or aluminum, is a composite scheme, and now there is no such technology, besides, a thousand horsepower is not the end, but also to continue to enhance the power, so, in the design, they used electroslag remelted steel.

The cooperation between the second machine factory and the first machine factory is very extensive, after all, the two factories are in grassland city, and this set of equipment was imported back then, and it also has a close relationship with Qin Zhenhua.

Zhang Lao looked very seriously, listened to the introduction, and then continued to walk forward and saw the process of processing the tank gun.

After the cannon steel of the tank gun is refined, it is necessary to carry out deep hole processing, and in the gun steel, drill out a hole, which uses an ultra-long drill bit, which is quite a test of technology, because in the process of processing, the outside is not visible, can not be viewed directly, but also to ensure that the processing must achieve a high degree of accuracy, and the slender pipe fittings are also prone to bending and deformation in the processing process.

"This master has been working in gun barrel processing for decades and has a lot of experience." Xie Huimin introduced the operator to Mr. Zhang, and the middle-aged master was also extremely excited and shook hands with Mr. Zhang.

This is the craftsman of the great country! If you want to develop the industry, you must have a group of people who carefully study technology in the workshop, there are many in a machine factory, and the most impressive thing for Qin Zhenhua is, of course, the old welder who has a disabled left hand and is still studying welding technology.

There are also a lot of them here in the Second Machine Factory, and this one engaged in the deep processing of gun barrels is one of them.

His skills are first-class in the country!

After drilling, you have to go to the hammer machine, the drill machine only drills through a hole, and the hammer bed is to hammer the hole step by step.

These are rough machining, after completion, the barrel body must be subjected to some necessary processing, rifled guns to be rifled, to be self-tightened, to chrome plating, as well as surface treatment, heat treatment, non-destructive testing and so on.

Walking along the production line of the barrel, the morning time passed, at the end of the production line, looking at the 105 mm tank gun produced, Zhang Lao was also very emotional: "With this tank gun, we no longer have to worry about the armored torrent in the north!" ”

"However, after all, this is a backward technology in Europe, and the times are calling us, our second-generation tanks, third-generation tanks, need tank guns with larger calibers."