Since a long time ago, Liu Yijiu began to work on the transformation of tank guns.

The most important thing is the cannon steel.

A new type of cannon steel, and it is also a new type of cannon steel with rare earth elements. At the beginning, in order to get this material out faster, from the formula to the process, Liu Yijiu was hands-on. That's why it's so easy to get a tank gun.

If you want to ask what is the most powerful thing about the republic, it is estimated that after the twenty-first century, the whole world will know, copycat!

The republic is because of the copycats, so the whole country has become a super-manufacturing power in a very short time. Of course, a manufacturing power is not the same as a manufacturing power, and there is basically no comparison between the two.

However, at present, this kind of copycat ability is very important for the current military industry of the republic, such as Lao Maozi's T64 and their T72, the tank guns of these two tanks are the same, both are 125 mm smoothbore guns, but the double diameter is different.

Liu Yijiu did not follow their coming, but designed it himself, using the Western standard 120 tank gun, and the double diameter is 45 times the caliber, and the length of the entire barrel reaches 5.4 meters. This is a strange thing in this era, especially for medium tanks. The length of the entire tank is 6.3 meters, the width is 3.4 meters, the height is 2.25 meters, and the barrel length reaches 5.4.

Most of the tanks of the 59 modification use a barrel length of 39 times or 42 times the diameter.

If it weren't for the fact that the processing technology was very difficult after the barrel length was increased, he even wanted to make a barrel length of 55 times the diameter.

It is known that the longer the barrel. The higher the accuracy of the shell, the longer the firing range.

"Director Liu. Are you here? Chen Yang didn't expect to arrive at the base of the Ninth Academy. Liu Yijiu directly asked him to take over the tank gun project from Yu Mingjiang.

Yu Mingjiang now put all his energy on the fire control system and the artillery stabilization system.

"I have already contacted the Rongcheng Military Region, hoping that they can arrange for our tank guns to be tested in the next few days. At the same time, we will also be responsible for conducting actual combat tests of our artillery reconnaissance radars......" Liu Yijiu nodded.

Tank guns have been working on for quite some time.

They need to test not only the entire system of tank guns, but more importantly, the performance and service life of these tank guns.

Anyway, this time, a thousand rounds of artillery shells were prepared, just to be able to test the service life of their new artillery steel.

The samples of the new artillery steel for the Americans were not added with rare earths.

For my own use, rare earth elements are added.

"Start live-fire testing now? Isn't it too early? Now we have only produced a total of three qualified cannon barrels......" Jiang Ming, who was on the side, asked Liu Yijiu with a frown. "We've used a lot of new technology for this gun. And for Lao Maozi's cannon, the technology is not thorough, is it a period of theoretical verification and static testing? ”

"No, isn't there no problem with our theoretical verification? These guns must be tested as soon as possible. The Pakistanis are urging very hard now......" Liu Yijiu stroked the unpainted metal fort on the workbench, and the cold feeling penetrated directly from the palm of his hand to the bottom of his heart.

This thing can only be tested on the battlefield to test its true performance.

He thought that the drawings he had drawn from memory and had been modified by himself were fine. These tank guns used a self-tightening process. At the same time, the problems of these small details of the cannon hoop have been improved. The thickness of the chrome plating layer of the entire inner chamber has also been increased a lot.

The only thing is that the production efficiency is too low.

But these are not problems, after all, they don't have much production capacity on their side, and they are not specialized artillery factories.

There was no barrel on the top of the turret, and the automatic reloading mechanism below was not hidden. A circle of vertical shells is arranged in a ring under the turret, and the whole mechanism is not only hydraulically controlled, but also mechanically controlled in the event of a problem with the hydraulic control. It's just that at that time the design speed of the tank will drop a lot.

"Director Liu, your design is really amazing! If on the battlefield. Our troops will win the war because they have a faster firing rate and greater accuracy than the enemy! "The Pakistani military sent here to cooperate and learn from the tank artillery expert Mohammed. Taka. Aix. Almost every time I see Liu Yijiu, I will not hesitate to praise this tank gun that has not yet undergone shooting experiments.

Pakistan simply could not design and produce cannon barrels that were more than forty times as long.

Long-barreled tank guns with more than forty times the caliber are all cannons, and now there are not too many countries that use 45 times more long-barreled tank guns.

There were only the United States and the Soviet Union.

Liu Yijiu smiled and nodded, he was really immune to this guy's compliment.

"The length of the body tube of forty-five times the diameter, the high and low firing range of -8 ° ~ ~ + 20 °, and the firing range of 360 ° direction are really perfect, especially the rate of fire of 8 to 10 rounds per minute, if Ah San knew that we had such a tank, I don't know if they would cry ......" The compliment continued, Liu Yijiu still had a smile on his face, even if he was unhappy in his heart, but he could only silently endure the compliments he listened to at least ten times.

"Aix, these cannons haven't been fired on the spot yet, and the specific performance is not known yet......" Jiang Ming smiled bitterly and looked at Liu Yijiu, who was enjoying himself, and said to this old man in his fifties.

"Didn't you say that there was going to be a shooting experiment soon? I'm looking forward to it. Especially with such a cannon on a medium tank, it is really creative. If it is thrown into the Kashmir plateau, it will form a torrent of steel and drive all the invading troops of Ah San out of our land......" The more the old man spoke, the more excited he became.

In the end, Liu Yijiu could only shake his head helplessly.

If it weren't for God's sake, he would have lifted a cannonball and plugged his mouth.

This guy is a typical war fanatic.

"There is no problem with the various theoretical tests of this cannon, right? During the shelling test, all three barrels were brought in, and the fourth should be about to come out, right? "The barrels produced in the base are too slow.

Due to the improvement of the process, and it is all experimental production, the barrels produced in front of it are basically one in each batch.

The barrel of a tank gun is not a monolithic.

Even with very strong deep hole processing technology, it is impossible to process and shape a barrel five or six meters long or even longer at one time.

Of course, the main thing is to consider the cost of processing.

As a result, the self-tightening process of the gun body appeared when the requirements for chamber pressure of smoothbore guns became higher and higher.

Barrel processing technology, the process does not seem to be very complicated, because it is to process an outer circle, an inner hole, and nothing else.

However, the inner hole is only 120 mm in diameter, but it is several meters long, and the lathe cannot process it at all, because the longer the tool holder, the worse the rigidity, and in the process of cutting, the phenomenon of making the knife will occur. As a result, broaching can only be carried out directly after casting using a broaching machine that originally belongs to the finishing category, which not only takes a long time but also costs more.

The production cost of a handful is more than ordinary people imagine.

These things are very simple to see.

However, these details have a very high impact on the performance of the entire tank gun, such as the speed of the shell, the first hit rate and the firing range, etc., all of which have a very high impact on the processing quality.

It becomes a requirement, that is, the inner wall of the barrel must be very smooth and wear-resistant, otherwise, it will affect the service life of the barrel.

The life of tank guns in Europe and the United States is 500 to 1,000 rounds, and if it exceeds 600 rounds, the accuracy will be reduced a lot.

The life of the Soviet tank gun is basically 300 rounds, after 300 rounds, the accuracy will be reduced, and when it reaches 500 rounds, it will be completely scrapped.

The technology of the republic comes from the Soviet Union, so this is also a hard wound of the republic.

Liu Yijiu just knows this problem, so he is so concerned about this. Whether or not the Republic can solve these problems that will plague the Republic for decades to come depends on the actual use of these barrels. According to the design theory, the service life of the 45-fold barrel produced by the new gun steel with rare earth elements can be increased to more than 1,000 rounds. The accuracy will gradually decrease around 800 rounds, and after 1,200 rounds, the barrel will basically be scrapped.

Of course, if all the tail fin stabilized shelling armor-piercing shells are shot, this thing is estimated to only shoot six or seven hundred rounds, and the accuracy will have to be reduced.

"It is estimated that the barrel will not be able to catch up, and it is still being chrome-plated, and after chrome plating, it will have to be finished...... Chen Yang said with a wry smile.

"If the experiment here is successful, Chen Gong, you go to Factory 2983 once, and the current development of a 152 mm howitzer with a 55 times diameter body tube is in a predicament......" Liu Yijiu nodded, and did not say how many more barrels they must produce.

Accumulating production experience is the most important thing.

The ambition of the 2983 factory is very big, originally it only produced mortars, but now it has directly launched a 152-mm heavy cannon howitzer, if it wasn't for Liu Yijiu to stop it, they would even be engaged in 155 or more.

This is also because of Zheng Hao's support at the beginning.

For this, Liu Yijiu even personally drew a lot of drawings of key parts for them.

At the moment, the production of self-propelled artillery is somewhat unrealistic, but the production of towed heavy artillery is definitely not a problem. (To be continued......)

PS: Continue to pay off the previous debts, I knew that I wouldn't be lazy last month......