Hua, at present, the prototype unit of Yu's Seven Towers and submerged arc welding machine and other equipment have arrived in Yancheng. According to your technical suggestions, we will build our first sulfuric acid plant. This letter is to explain the current situation of Yu's Seven Towers.
,The second is to seek technical help.
Long before the Yu's Seven Pagodas project was carried out, the base area had already launched a pre-war major movement plan to cope with the increasingly tense war situation. The main content was to establish a certain level of basic industry and produce weapons and ammunition, which was divided into three steps.
The first step is to build a sulfuric acid plant, a nitric acid plant, and a small explosives factory. It is expected to take three months. Now, in addition to the sulfur and nitric acid plant, the small explosives factory has been overfulfilled, with an annual output of 100 tons of explosives. The sulfuric acid plant is expected to take three months.
Built inside.
The second step is to realize the mining of steel, blast furnace, coke, coal and iron ore. It is expected that in one year, an electric furnace steel plant has been established, with a daily output of 240 kilograms of electric furnace steel. The blast furnace and coal and iron ore mining are on track, and there is no progress yet in coke.
The third step is to realize the production of weapons and ammunition for grenades, rifles, mortars and other light weapons and supporting ammunition. It is expected that within one year, the current arsenal can only produce semi-finished grenade shells, and other targets cannot be manufactured due to lack of drawings and mechanical processing equipment.
I listed in detail five aspects of technical issues, metallurgical technology, seamless steel pipe technology, mechanical processing equipment, power supply, rifle drawings and mortar gun drawings.
The Japanese aggressors have never ceased to invade China, and the situation in Peiping has become increasingly tense. I hope that China can provide constructive suggestions or technical help. Chen is grateful.
General Administration of Military Industry, Chen.—July 1, 1937.
The letter is signed with a red square stamp to verify the authenticity of the letter.
"It's actually a letter from the brigade commander. It's interesting. Unfortunately, there probably isn't a regimental commander named Li Yunlong here anymore."
After Yu Hua read it carefully, he was surprised and interesting. He took out the matchbox with his right hand, lit a match and lit the secret letter. He thought to himself: "You are indeed a great teammate. In one and a half months, the industry in the base area has been very impressive. Although
The scale and level are not high, but at least we are making progress.”
go ahead.
This is hard and serious progress, a visible progress.
Although the industrial level and scale of the base area are pitiful, the annual output of the explosives factory is only 100 tons, and the annual output of the electric furnace steel plant is only 87 tons.
But so what?
To be able to achieve such results in one and a half months is already regarded as China's speed.
It is worthy of encouragement and praise.
Nowadays, the small boat of industry in the base area begins to set sail and sail towards the magnificent sea full of dangers and opportunities.
What he has to do is to help this small boat repair its mast and provide better oars.
In the office, orange-red flames bloomed continuously, and the letter paper carrying confidential information slowly burned and turned into ashes.
"Metallurgical technology mainly includes coking, pig iron smelting and steel formula. Pig iron smelting and steel formula are not urgent for the time being. Coking technology can be provided first. Seamless steel pipes need to be produced by rolling mills. The rolling mills have to wait for German machine tools to be finished. Electricity supply is a big problem.
The problem is that for domestic electricity, industrial electricity must be supplied to high-power generators, or to build a small thermal power plant in one step. If a thermal power plant is built, it needs to involve the blades of the steam turbine, which requires not only high-strength steel,
It also requires precision processing..."
After the letter paper was burned, Yu Hua took out a piece of draft paper and silently thought about the five technologies mentioned by the brigade commander, conducting feasibility analysis and thinking: "The final rifle drawings and mortar gun drawings are not a problem. I think the brigade commander
The difficult point should be which rifles and mortars to make, but in fact, bullet production is the top priority."
Although the bullet is small, the technology and craftsmanship involved are more than a hundred, which is much more difficult than making a rifle.
"Bullet production will not be rushed for the time being, and the problems will be solved slowly one by one. First of all, I want to make the first point clear. As Yu Hua, I don't know about the German machine tools and equipment that Zhang San is about to donate. Based on this premise, I can plan and arrange
I will give you technical and theoretical suggestions, but I cannot give you any substantive equipment." Yu Hua looked serious. Since the organization actively seeks technical help, there is no reason not to help, but there is a clear prerequisite for how to help.
I am Yu Hua, not Zhang San.
You cannot violate the scope of your own identity.
With rigorous ideas and clear rules, Yu Hua stared at the five technical issues written on the draft paper and focused on the first metallurgical technology.
It is obvious that the metallurgical technology involved in the base is far from high-end and extensive. It mainly covers three contents, coking, pig iron smelting, and steel formula.
At this stage, in my own capacity, it is unreasonable to handle pig iron smelting and steel formula, so I directly deny it. The only thing that can help is coking technology.
Coking is a process of converting dry coal into coke through physical heating. The temperature is about one thousand degrees Celsius. The principle is through thermal decomposition and coking. The core of the technology lies in thermal decomposition and coking.
The question is, from a technical and technological perspective, how to achieve thermal decomposition?
It's very simple, just turn on the stove.
A furnace that can be heated to a mere thousand degrees Celsius without self-melting, and undergoes thermal decomposition and coking internally to complete the material transformation of coal from coke, can be called a coke oven.
A coke oven alone is not enough, it must be a device for loading coal and extracting coke, an upper conveyor belt and a device for pushing coke.
Time passed slowly, and Yu Hua quickly designed a set of coking equipment based on the coking principles that was very suitable for the base level. The coke oven carbonization chamber has a volume of 5 cubic meters, and the coke output can easily meet the daily output of a blast furnace with a daily output of 5 tons of molten iron.
This early coking method is not difficult at all. What is difficult is large-scale coking, which requires high efficiency and high output. It has very strict requirements on all aspects of process and technology, and the raw materials must be refined.
After simply solving the coking technology, Yu Hua shifted his attention to the second technical issue - seamless steel pipes.
After taking a look, Yu Hua silently wrote down the key equipment needed for seamless steel pipes, as well as the machine tools to manufacture such key equipment, and then...
There is no more.
It doesn't matter what the technical theory is, but for the actual equipment, I can only apologize to Yu Hua.
The third technical problem is the lack of mechanical processing equipment in the base area. Just as it happens, Yu Hua gave a preliminary and implementable answer. Use electric furnace steel to make simple machine tool equipment, and then use this simple machine tool equipment to manufacture complete machine tool equipment, and carry out a technological change route.
.
The conditions are very harsh, time-consuming and labor-intensive, but it is a feasible solution. After all, all human beings' high-precision machine tools are upgraded in this way.
The fourth question was about power supply. Yu Hua’s answer was to imitate the generator. After the machine tool problem was solved, he would launch a high-power steam turbine generator set and build a thermal power plant in one step.
The base area is backed by the Ikezhao League. Most of the coal mines are open-pit mining, so there is no shortage of coal.
Regarding the fifth question, after careful consideration, Yu Hua suggested imitating the Chinese official rifle and 60mm mortar.