Chapter 318 If you want to learn to run instead of walking, it’s never a question
In Liushugou Machinery Manufacturing Factory, the hustle and bustle of the headquarters' special agent station, as well as the news of the finalization and mass production of the 60mm mortar project, did not affect this place.
On the workbench of GROB's high-precision lathe, a metal rod with a diameter of about 400 mm, made of gray cast iron, is fixed. This is the core component of the compressor unit of the air separation equipment - the rotor spindle.
The structure of a turbine compressor is different from that of a conventional compressor. The internal structure is similar to a motor, consisting of a rotor and a stator. The rotor is divided into two parts, the main shaft and the impeller. The stator belongs to the fuselage. The most difficult part to process is the main shaft.
with impeller.
Although the mechanical properties of gray cast iron are not as good as those of electric furnace steel, they can still meet the mechanical requirements of the compressor rotor main shaft.
"A total of three spindles need to be processed. Each spindle is processed using the active machining method, which is often used to measure while processing, roughing first and then finessing. The efficiency can be slower, but try not to make mistakes. Once the car is scrapped, it will not only be a waste
The materials will cause economic losses and delay the delivery schedule. You must complete the spindle processing before August 5th." Before starting the processing, Zhuang Qianding stared at the five members of the lathe team and solemnly explained the situation: "You are solely responsible for the spindle processing.
, I hope everyone is mentally prepared."
Zhuang Qianding chose to hand over the main spindle processing task to a team of five lathes who had just mastered basic operating skills after a short period of training. He, on the other hand, had to go to the milling workshop next door to process the impeller, which required the highest technical requirements.
Special periods require special treatment. Under normal circumstances, tasks such as machining the spindle of important equipment are generally handled by the most skilled senior lathes in foreign machinery manufacturing plants. The apprentice lathes can only do a little bit of work.
Serving tea and water.
Lathes like Huan Wu and others who have only touched the lathe for a day are not even apprentices, and it is absolutely impossible for them to be responsible.
However, things are so mysterious. To choose the taller one among the short ones, Zhuang Qianding could only choose to hand over the spindle processing task to the five lathe workers.
After hearing the news from Zhuang Qianding, the five members of the lathe team looked at each other with solemn expressions in their eyes. August 5th, that is to say, there are still fourteen days left.
To complete the processing of three spindles within fourteen days, this is definitely a big challenge for them who have just mastered the basic skills.
But they have no choice.
"In addition, regarding the method of disposing of substandard gun barrels, I went to the headquarters yesterday. After discussions with Director Chen Kang, I finally agreed to handle it according to the method proposed by Comrade Hu. Now you can process the gun barrels with confidence and boldness in the future.
The blank is gone." After Zhuang Qianding announced the task of the rotor spindle, he changed the subject and brought up the disposal method of scrap gun barrels: "I believe you must be thinking in your hearts, why am I so strict? It is only 0.1 mm outside the tolerance range.
Cannon barrels that have been manually forged, rough rolled, finished rolled, annealed, pickled, and finally finished must be classified as unqualified, does anyone understand?"
"Sir, we all want to understand. Some of the mortars we have repaired in the past have an actual inner diameter greater than 1 mm, and they can fire even if the shells are put in them. Why can't it work this time?" After hearing Zhuang Qianding's words, the five people
They were stunned for a moment, looked at each other briefly, and then Juan, who had the highest grades and skills, asked questions, speaking respectfully and seriously.
Why, yes, they want to understand why it is so strict. You know, they used to manufacture weapons and ammunition, let alone 0.1 mm, even if the accuracy error reaches 0.5 mm, they can still be used.
During the Guantian Arsenal period, many mortars had barrels that were worn. After repairs, the actual inner diameter of the barrels differed from the inner diameter on paper by nearly 1 millimeter. However, the cannonballs could still be used after being inserted into them, and they could still fight white bandits.
Zhao Zhangcheng used the mortars they had repaired and still hit the target with perfect accuracy, which was widely praised by the soldiers in the army.
But now, if the tolerance is exceeded by just 0.1 mm, it will be classified as defective.
I don’t understand, I really don’t understand.
"This issue is not essentially about whether the gun barrel can be used, but about attitude, attitude towards tolerance standards. Let me ask you, how does the current mechanical manufacturing level in the base compare with foreign countries?" Zhuang Qianding smiled, his face
Gentle and friendly, not angry, he explained slowly.
"We don't know, but we certainly can't compare. They can build aircraft, artillery, tanks, as well as aircraft carriers and battleships that were taught in the Anti-Japanese University School before. Now we can only build mortars." Hearing this, Juan showed a trace of confusion in his eyes and shook his head.
road.
"If there are a total of 10 manufacturing levels, the United States has level 8, Japan has level 7, the Soviet Union has level 7.5, France has level 9, and the United Kingdom and Germany have level 10. However, we can only be regarded as level 2 at best and are infants in the manufacturing industry."
Zhuang Qianding nodded, gave a simple example to classify the level of manufacturing industry, and looked around the crowd: "In my opinion, there are two factors that determine the level of manufacturing industry. One is based on hardware based on technology and industrial foundation, and the other is based on the standardization system.
software, the two complement each other. The reason why foreign manufacturing levels are high is because they have basically achieved a high degree of integration between software and hardware. A Mauser pistol made in the Republic of China, a Mauser pistol made in the United States, and an original German pistol.
Choose one, which one will you choose?"
"Definitely made in Germany, high quality, stable and reliable, with little rifling wear and high precision." Juan replied without hesitation.
Just kidding, if you had to choose one of the three, of course it would be made in Germany.
The other four were silent, as they seemed to have understood what Zhuang Qianding was going to say.
"The reason why German manufacturing is so good is because they are very strict about the standardization system. One is one, two is two. I have stipulated that the tolerance cannot exceed 1 mm, so if the tolerance of your processed parts reaches 1.1 mm, it will be unqualified. There is no mercy.
Word."
Zhuang Qianding nodded and his face turned slightly serious: "Your manufacturing industry has just started, so you must strictly treat tolerance standards. If there is a little more here, it is almost the same, and if there is a little more there, it is almost the same. Weapons like mortars are really no big deal.
, but what if it’s more sophisticated weapons and equipment? It’s never a problem to learn to run instead of walking, but you have to ask yourself if you have that ability!”
"As a baby in the manufacturing industry, you must be down-to-earth and take one step at a time! Only in this way can you have the opportunity to become a manufacturing powerhouse."
"Unless you only want to make mortars forever."
His voice gradually became louder and more serious.
Don't learn to walk, just run. That's what a genius should do. That's Yu Hua's job.
It is indeed possible to use a gun barrel with an inner diameter of 0.1 mm more, but this is not a question of whether it should be used or not, but a question of the manufacturing industry's attitude towards tolerance standards.
Just because you feel sorry for the gun barrel, you cannot turn a blind eye to the tolerance standards and violate them at will.
The five people nodded silently.
"In short, I hope you understand the principle of supremacy of tolerance standards, which is the soul of machinery manufacturing. The situation that Comrade Hu said in the past was larger than one millimeter after repair could only occur in other places, not Liushugou Machinery Manufacturing Factory.
In essence, Guantian Arsenal is a workshop, which is very different from your current situation." Zhuang Qianding finally said.
"Sir, what you said is very good!" At this moment, a deep and powerful voice suddenly came from behind. The person who came was the boss who came to inspect, followed by General Liu, Chen Kang and others.
"Hello, Chief!" The five members of the lathe team immediately saluted.
"Hello, Chief, why are you here?" Zhuang Qianding turned around and saw the boss and his entourage. He nodded and greeted, somewhat surprised.
"I just came to take a look and inspect the arsenal. I didn't expect to hear these heartfelt words. Sir, you are right. Our manufacturing industry has just started. We must strictly treat tolerance standards. We must not have the same mentality. Chen Kang, as long as technology
If you have any questions, you must listen to your husband." The boss's face was full of solemnity. Although he was a layman in the manufacturing industry and did not understand metal processing, he knew what Zhuang Qianding was doing.
This is a teacher who preaches, learns and resolves doubts, and sincerely plans for the future of the machinery manufacturing industry in the base area and creates the most important system.
"Yes!" Chen Kang in the team responded.
"Chief, I don't talk about anything, nor do I care about authority. I will adopt everyone's good suggestions." Zhuang Qianding shook his head and smiled when he heard this, and said: "If there is nothing else, I can't accompany you. There are still many people today.
A lot of machining tasks.”
"No, sir, you are busy first." The boss shook his head, his words were full of respect, and then led the team to leave the turning shop and go to the next place for inspection.
"Comrade Hu, let's get started. I'll go to the milling workshop to process the impeller. If you need anything, call me. Remember, you have 14 days left." After the boss and his entourage left, Zhuang Qianding looked at the five lathe workers and said seriously.
said.
The words fell and he left.
There were only five people left in the turning workshop, and everything fell into silence.
"Comrades, I just want to say one thing, tolerance standards must be put first!" Juan took a deep breath, looked at his comrades around him, and said solemnly: "Our backward thinking in the past needs to change."
Everyone nodded solemnly, as if taking an oath in their hearts, imprinting the concept of tolerance standards first in the deepest parts of their hearts.
"Buzz!" After a moment, the sound of the GROB lathe running was heard in the workshop. Metal and metal were in contact and colliding, playing a special piano music.
The processing of the first rotor spindle has officially begun. The five-person lathe team must process the cast spindle blank with a diameter of 400 mm and a length of 800 mm to a diameter of 340 mm, a dimensional tolerance of ±200 microns, and a surface roughness of 25 microns according to the design drawings.
.
For a group of lathes who have never been exposed to precision machining before, this is definitely a tough nut to crack.
When it comes to the finishing step, you cannot make a single mistake. If you make a mistake, the rotor spindle blank that you have worked so hard to cast will be declared scrapped.
You know, in order to obtain one high-quality rotor spindle blank, three blanks often need to be scrapped during the casting process, and the cost is not insignificant.
…
In the milling workshop next door.
The GROB semi-automatic gantry mill, which weighs several tons, has gone through repeated commissioning, acceptance and final inspection, and has obtained the approval qualification to start production. Zhuang Qianding led a five-person milling team who had not yet passed the milling theory assessment to carry out the task of machining the rotor impeller.
Preparatory work before.
The rotor impeller core consists of an impeller disc, main blades and splitter blades. The two-stage nine-blade design requires a total of two impeller discs and eighteen metal blades.
A total of three units, including the air intake unit, compressor unit and expansion unit, require rotor impellers. Zhuang Qianding rushed to process a minimum of six impeller discs and fifty-four pieces before August 5. Considering that there may be damage and accidental factors in the assembly,
The final quantity must be increased by more than 10% as safety redundancy.
Fortunately, due to the casting impeller process, the impeller disc and blades only need to be finely milled once. In order to ensure mechanical properties and strength, the impeller disc is made of gray cast iron, and the main blades are cast from electric furnace steel.
The semi-automatic gantry milling was replaced with a T-shaped slot milling cutter made of high-speed steel. Two young apprentice millers lifted an iron impeller plate weighing more than 20 kilograms cast in an iron factory and placed it on the surface of the workbench for benchmarking.
Positioning and fixing.
Milling, as one of the advanced metal processing techniques, has a high threshold and complicated operations. It is not as easy to learn as a lathe. There are very few people in the base who understand milling processing, and there are no workers who are proficient in milling technology.
The five members of the milling team are basically learning from scratch. Apart from doing some physical work and doing odd jobs, they are currently unable to help Zhuang Qianding.