The door of the courtyard house has been welded dead

"The free torsional rigidity of hot-rolled steel is higher than that of cold-rolled steel, so the torsional performance of hot-rolled steel is better than that of cold-rolled steel."

“Torsion resistance?”

Li Feng, sitting in the conference room, opened his notebook and carefully wrote down the differences between the two.

Those who participated in the meeting were the purely technical departments, the chiefs and deputy chiefs of the technical section, and the workshop directors of the hot rolling and cold rolling workshops.

Because it involved "teaching" the deputy factory director, a blackboard was placed in the conference room to explain the general differences between the two types of steel rolling workshops to the deputy factory director.

"As the name suggests, free torsion means that there are no constraints at both ends of the member and it can be freely propagated. Different torsion stiffness means...!"

"Wait, wait~!"

Li Feng stopped writing the pen in his hand, his mind a little confused. As a liberal arts student, his knowledge of science and engineering was still at the level of the second year of high school.

Although you can receive this kind of "special training" and cram for the exam, it does not mean that you can absorb too many key points at once.

Simply put, it's not a joke. He knows every word, but when they are put together, it gives him a headache.

He couldn't stand it. He really couldn't stand swimming in the ocean of knowledge. Li Feng felt that if he continued talking, he would be drowned.

"Don't talk about torsion resistance or stress. I'm just asking, between the two workshops, which one has better side impact resistance and twisting resistance for a rolled steel bar that's about two fingers wide and 0.5 millimeters thick?"

Waving his hand, Li Feng interrupted Mr. Han's lecture and asked his questions directly.

"Cold rolling workshop~!"

Chief Lu of the Technical Department looked at Deputy Director Li's serious expression and pointed at Director Feng of the Cold Rolling Workshop with the pen in his hand.

Director Feng, whose name was called, nodded, agreeing with Chief Lu's words.

"Isn't that right~!"

“Is it difficult for the cold rolling workshop to produce steel bars of this width and thickness?”

"For ordinary steel, there shouldn't be any blockages. I think we have ready-made molds. But the output of our workshop is much lower than that of the hot rolling workshop. Can the deputy director give us the specific output?"

It is no longer a secret that the factory will be carrying out military production in the near future, and many people know about it.

Even Deputy Director Li, who rarely got involved in production, had to learn and write things down personally. When he saw the task this time, he was very surprised.

"Don't ask about the output yet. We haven't reached the stage of mass production yet, so it won't affect your current indicators~!"

"Forget it, the hot rolling workshop is the same, let's try both first~!"

Li Feng stood up from the conference table, walked to the blackboard, picked up the chalk and started drawing on the blackboard.

"The length is 3.5 meters, the width is 1 meter, the steel bars are welded horizontally into this cage, a reinforcement rib is added every half meter, and the grilles are welded at a five-centimeter interval~!"

"any questions?"

According to his memory, Li Feng roughly drew the appearance of the grille armor on the blackboard. It looked like the prototype of an iron cage.

"What about the width of the internal steel bars? Two fingers wide. Are there any specific requirements?"

Director Yan of the hot rolling workshop raised his hand after writing down the request.

"Three centimeters, let's do this first. Hurry up. There are two workshops. Make one each and send it to - send it directly to the shooting range~!"

"range?"

"range?"

Both Director Feng from the cold rolling workshop and Director Yan from the hot rolling workshop looked at Li Feng with question marks on their faces when they heard this request.

Raising his wrist and looking at his watch, Li Feng looked at the two workshop directors, tapped his finger on his watch, and signaled them to hurry up.

"Don't worry about it yet, don't ask. Just hurry up and make the product. You will know later. Section Chief Lu will also go with you. The two directors will also go. The others don't need to follow~!"

"Disband~!"

After picking up the notebook on the table and making his request, Li Feng decisively left.

The section chiefs looked at each other in bewilderment and immediately dispersed.

It is more than three meters long and one meter wide, plus the welding work, which is indeed a lot of time. As for materials of corresponding sizes, I'm afraid I'll have to search the material pile to see if there are any ready-made ones.

The security department also received the corresponding notice, and two boxes of sixteen Type 56 warheads and two launch tubes were also taken out from the warehouse. After a hurried lunch at noon, Li Feng arrived at the shooting range.

The anti-aircraft gun that was still under assembly also revealed its prototype at this time, lying on the ground with its fangs and claws bared, and its two black gun barrels were pointing at the completed target trench.

The target trench with concrete and reinforced concrete structure is much better than before. The half-meter thick concrete wall looks much stronger.

The pile of earth, which was originally pitted by bullets, is right behind the concrete wall. Compared with before, the pile of earth is now mixed with waste bricks, stones and other construction waste, which greatly improves its strength.

The originally empty ground on both sides was now piled with thick sandbags, and prefabricated panels were placed on top of the sandbags to prevent fragments from flying everywhere.

In a word, rough.

The semi-underground structure of the shooting range does look very rough, and due to the haste with which the shooting range was rebuilt, this was the only way possible.

Over in the Transportation Department, there are not many construction workers transferred over to the research institute that is under construction. Since we have to take care of both ends, we can only do it as simply as possible.

"Hello, comrade. Do you think this thing's armor-piercing bullet can penetrate the current trench?"

After walking around the target trench, Li Feng squatted down, took out a cigarette from his pocket and handed it to the soldier who was installing parts below.

"Fortunately, I've seen that it's barely enough. You're using it for experiments, right? The target trench can't be covered too tightly, otherwise the air pressure generated by the explosion won't be able to escape~!"

Taking off the gloves in his hands, the soldier with the rank of sergeant took the cigarette handed to him by Li Feng, crawled out from the bottom, and sat cross-legged on the ground.

"The board on the top looks hollow to me. Shrapnel from a grenade might penetrate it. It'd be best to reinforce it~!"

After lighting their cigarettes, the two heavy smokers started puffing away at the shooting position.

"Okay, if you need help, just ask. Don't put these four wheels on. This thing will be fixed here after it is level. When you teach them, please be careful~!"

Patting the young man on the shoulder, Li Feng stuffed the remaining half pack of cigarettes into his pocket.

There are still some people in the security department who know how to use rocket launchers, but no one can operate anti-aircraft guns yet. If they were not in the army, Li Feng would have wanted to keep them.

The top priority is to test the grille armor, obtain the experimental data, and prepare for the next step of production after reporting.

This thing is not difficult to process and produce. Not to mention a steel rolling mill, even a small workshop can make it by hand. The main thing is the bulletproof material at the back.

"It's fine to fix it. I'll put up the hydraulic rods and you can just pour the cement. It's easy!"

I don’t know if it was the half bag of Peony given by the deputy factory director that worked, but after the old soldier accepted it with a smile on his face, he worked happily and agreed readily.

It's about one o'clock in the afternoon.

The processed grille was pulled to the shooting range by a tricycle, along with the rocket launcher stored in the security department.

Several technical department personnel were stunned when they saw the extra anti-aircraft guns at the shooting position of the shooting range. If Li Feng had not been nearby, they would have wanted to go up and touch them.

Compared to other people's curiosity about the anti-aircraft gun, Li Feng was checking the grilles he had made. He even took out the warhead of a rocket launcher and gestured the spacing of the grilles.

No one knew the purpose of Li Feng making this grille, not even Li Xuewen who came over to watch the fun.

"Can this thing block it?"

However, the sergeant in charge of installing the anti-aircraft gun seemed to understand something. It was mainly because of Li Feng's gestures that it was quite obvious.

Maybe it’s because he has been to many test sites, was responsible for debugging and installation, and has seen a lot.

"I'm sure we can't stop the armor-piercing shells from anti-aircraft guns, so let's see if this thing can work~!"

Shaking the RPG warhead in his hand, Li Feng couldn't help but feel a little nervous. Everything was just in theory. Success or failure still depended on actual practice.

"Keep the grille and the concrete wall in place, leaving a 30-centimeter gap~!"

Looking at the wobbly grille that had no fixed position, Li Feng slapped his head belatedly.

They were so busy designing the grille shape that they didn't consider the bracket. This little episode was resolved after the tripod was welded with angle irons.

The grilles, which are kept at a six-centimeter spacing, appear to be relatively dense, but it is unclear whether they can block rockets.

Everyone present remained skeptical.

"Swoosh~~!" (End of this chapter)