(Add 56/100 for liwers)

"Have you studied this? And have you done experiments?" Liu Yijiu was very surprised.

This has proved that his years of work have not been in vain.

Factory 2983, after having a foundation, those development trajectories have developed completely in the direction that technology can support.

Who says that Chinese people are not strong in design capabilities? That's because the foundation is not enough.

It has been developed abroad for hundreds of years, but how many years have it been in China?

"Yes, the samples are still in our warehouse now. The project has been temporarily abandoned. If the main part is made of high-strength gun steel, the brackets and accessories are light-weight aluminum alloy, etc., this will make the head heavy and seriously affect the shooting accuracy. If the main body is made of titanium alloy or super-win aluminum alloy, the high temperature and high pressure generated when the shells are fired inside the gun barrel will quickly deform the barrel..." Tian Deming explained to Liu Yijiu.

In this case, such problems will indeed arise.

Although domestic titanium alloys and super hard aluminum alloys are not much worse than those in foreign countries, they only began to develop rapidly in the field of materials research after Liu Yijiu entered the Dabashan base of the Jiuyuan.

The hardness of titanium alloy is indeed relatively high, but its toughness is also high. Relatively speaking, this ultra-light material has a lower hardness and strength in some aspects than that of super-hard gun steel. Especially in the gun steel used in China, a large number of rare earth elements are added to Liu Yijiu's interference, making the performance more outstanding.

After heat treatment, the mechanical and physical properties in all aspects such as hardness, wear resistance, toughness, etc. are very good.

The only bad thing is that the weight is too heavy.

With high density, the weight will naturally be heavy.

"Take me to see." Liu Yijiu decided that he should go and see this cannon.

If the design is reasonable, as long as the material problem is solved, you will soon be able to have a flying cannon.

The people from the artillery factory were naturally happy to take Director Liu to see their projects that were beyond the times. Without saying much, the group went to the laboratory factory warehouse.

Along the way, he kept introducing the various technical characteristics of their ultra-light heavy artillery to Liu Yijiu.

"The gun mount is an H-type plus a front support, and the sconcealer and the anti-recoil device are integrated into one, which is conducive to weight reduction. The gun body tube should be 39 times the caliber, because the gun is used to shoot intensively, the explosion rate can reach 5 rounds per minute, and 2 rounds per minute when shooting continuously." Tian Deming introduced the design situation to Liu Yijiu. "The h-type gun mount can ensure that the huge recoil force will not overturn when the cannon is fired. At the same time, the bottom is attached to the ground to allow the recoil to be directly transmitted to the ground... In the theme part, we use aluminum alloy and titanium alloy. The effect is very good during the early test firing. If it is fired continuously for ten minutes, the temperature inside the barrel will rise rapidly, causing the barrel to deform. After testing, the titanium alloy barrel will perform better than the aluminum alloy barrel..."

Liu Yijiu sounded a little scared.

How come this design sounds more and more like the ah-4 155mm ultra-light howitzer that was unveiled in China until 2014!

You know, this howitzer is China's first ultra-light howitzer that can fly. The total gun weighs only 3.5-3.8 tons, which is similar to the US m777 artillery. Many people even speculate that this is a copy of the US m777 artillery.

The same is true for Liu Yijiu.

After all, this thing is so similar, even the combat performance, etc.

But I never thought that in this era, China actually made this thing first than the United States.

When he arrived in the warehouse, Liu Yijiu was completely shocked when he saw the three lonely cannons unfolding in full shape and the barrel was raised high.

Just a little bit short of it, I exclaimed ah-4!

It really has an H-shaped front support, the chassis is against the ground, and there is no huge bracket used for counterweight like a drag-and-drop heavy gun. Even the entire gun body has become simpler.

"In this gun barrel, we use super hard gun steel with rare earth elements, and other brackets are made of aluminum alloy, etc. When bombarding, the center of gravity changes drastically due to recoil, so we have to increase the breeding, and the weight is not reduced too much..."

"This gun barrel is made of titanium alloy, and the overall gun stand is made of super hard aluminum alloy, which reduces weight and can be transmitted to the ground. The super hard aluminum alloy gun stand supported by the front and rear will begin to deform when it fires 60 rounds of shells continuously..."

"This gun barrel is made of super hard aluminum alloy, and the whole barrel is made of aluminum alloy. A total of 60 shots were tested, and the entire gun barrel was scrapped..."

Pointing at the three heavy cannons arranged neatly in the warehouse, Tian Deming said to Liu Yijiu.

All of them are the product cannons they have developed. These cannons look completely different from other 155 grenade cannons, but the barrel is also ferocious. The 39-fold body tube is very long.

"In other words, the current structural design is reasonable?" Although I was sure that the structure of this design was absolutely reasonable, Liu Yijiu still asked.

This is definitely the design of the m777 and the domestic AH-4 ultra-light 155mm howitzer!

Even if there are differences, the differences will never be small.

When the gun mount supports the entire gun, when it is closed, it is the cannon moving bracket with wheels on it. Once it is unfolded, it becomes the gun mount that supports the center of gravity of the heavy gun.

"Indeed, our structure is reasonable, and this has been improved many times. Of course, there may be a more reasonable design, but we do not have the funds or energy to study at present. The scientific research tasks of the entire factory are very heavy..." Tian Deming nodded.

"If titanium alloy is used as a bracket, will the barrel or the gun steel be used? How much weight can be controlled?"

"Seven tons. This is how our first cannon is. The accuracy is very poor unless the bracket continues to be extended..." Without any thought, Tian Deming answered Liu Yijiu's question.

"What about all of them using titanium alloys? The best titanium alloys." Liu Yijiu had a headache.

This will speed up the research process a lot. The problem is the current situation and it will be difficult to solve the material problem.

Materials are the most fundamental factor limiting the development of all science and technology.

He feels that the current domestic titanium alloy materials have sufficient strength.

However, now it seems that using titanium alloy as the gun barrel is obviously not enough.

This is really nonsense. Not to mention the difficulty of processing, just the problem of the barrel pressure and temperature deforming the titanium alloy when the barrel made of titanium alloy is a bit troublesome.

"We have considered that, there is no problem. The lifespan of the barrel will not exceed 200 rounds, and the cost will exceed 10 million..." Lu Ruixiang said gritting his teeth.

The cost of a heavy artillery exceeds tens of millions. Can artillery soldiers afford it?

Liu Yijiu's mouth twitched.

However, he was a little unbelievable. According to the current situation, the cost price of the top titanium alloy in China is only more than 700 per kilogram, which is almost 700,000 per ton. The gun weighs four tons, which is less than 3 million. However, when you think of the waste cut from the processing process and then consider the processing cost, the gun worth 10 million per kilogram is actually reserved.

"If the gun barrel and support body are made of titanium alloy, and other non-core parts are made of super hard aluminum alloy, can this cost be reduced?"

"Yes, the cost can be compressed to less than five million, but..."

Obviously, this design was unsuccessful.

There is a cannon next to it.

"This kind of cost is the lowest, but compared with the 155 guns equipped in China, the quality is only one-third, and the range is already accurate and other performance is worse, but the price is more than five times. It is difficult for the military to bear such a price. Even if it can be airlifted and airdropped."

"What if graphene material is added to the barrel of this gun? The aluminum alloy cannon tube is used outside, and the support is titanium alloy..." Liu Yijiu gritted his teeth and asked Tian Deming in a low voice.

At present, if you want to create this ultra-light cannon, it is obviously the material or the type that has not reached the 21st century.

Then, I can only think of a solution from graphene.

The strength of graphene is much better than that of titanium alloys.

This Ninth Hospital should be able to find a way to solve it. The weight of this material is even lighter than that of titanium alloy.

If you use graphene lining inside, use super hard aluminum alloy on the outside, and then use another layer of graphene material on the outside and spray painted, no one can know what material this thing is.

In particular, there is basically no possibility of exporting such guns.

Unless the materials are developed, the gun barrels are made using titanium alloy or aluminum alloy, or the gun barrels of super hard gun steel are simply directly used, it is possible to export them.

"What material is that?" Hearing Liu Yijiu whisper, obviously afraid of leaking secrets, Tian Deming also asked to him in a low voice, "If the hardness is stronger than titanium alloy and the toughness is not that high, there should be no problem..."

"Then you can only discuss with the comrades in the Ninth Hospital Base. I just think this is possible. Anyway, the factory is mainly production, so you can discuss with Chen Yang..." Liu Yijiu did not introduce graphene here.

The existence of this material is still an absolute military secret.

"Anyway, I hope to get this kind of gun out as soon as possible, and then, maybe there is a place to help us conduct battlefield experiments. At the same time, we need to add digital fire control systems, automatic bottom-fire loading devices, auxiliary loaders and other automation systems to improve survivability, lethality and combat reliability, and provide light artillery autonomous capabilities..."

As long as the titanium alloy gun barrel or aluminum alloy gun barrel is made, the total weight of this thing will not even exceed two tons!

Of course, if super hard gun steel is used, it will take a hard work in design.
Chapter completed!