my scientific age

The test piece in today's final test is the barrel blank, turning the outer circle and boring the inner hole, and performing precision machining on the inner and outer walls of the gun barrel.

Zhuang Qianding put the barrel blank weighing several kilograms into the three-jaw chuck, firmly fixed it and clamped it. After positioning and calculating the size of the test piece, he completed all this, and looked at the five surrounding lathes: "Although this is the final test, it is also a complete turning process. Please pay attention to my operation steps. The material of the barrel blank is medium and low carbon alloy steel, with medium hardness, and the rotation speed should not be too high, so as to avoid tool breakage and the amount of feed is small. point."

"Yes, sir!" The five turners nodded again and again, devoted themselves to their studies, and wrote down the essentials of operation given by Zhuang Qianding.

"Buzz!"

After the explanation, Zhuang Qianding turned on the switch of the lathe and started the whole lathe. The sound of the high-power DC motor rang out, and the main shaft drove the barrel blank to rotate.

Steady control of the feed box with both hands, control the feed of the tungsten alloy turning tool, contact with the surface of the barrel blank, strips of filamentous metal shavings emerge, and the surface of the outer wall of the rotating gun barrel suddenly shows a silvery white luster .

Smooth, clean, like a mirror.

Seeing this scene, the five turners were full of admiration. The layman watched the excitement, and the expert watched the doorway. Although they had seen the mirror processing, they still couldn't calm down when they saw it now.

Let’s not talk about the processing effect that I can’t even think about. Take Zhuang Qianding’s operation as an example. This is the integration of rough turning and fine turning. Only a real master can do this. Zhuang Qianding’s turning skills Has reached the point of perfection.

Everyone held their breaths and carefully watched Zhuang Qianding's operation steps, daring not to be careless. This is a precious opportunity that many people can't ask for. It is extremely rare for them to be selected to enter the machinery factory.

Under the watchful eyes of five people, after a few minutes, the outer circle of the 120cm-long gun barrel blank was turned and processed. The barrel of the gun barrel was silver and white. If you look carefully, you can clearly reflect the surrounding images, revealing a sense of mechanical art from top to bottom. , can be called a boutique.

As a mortar tube, the processing quality and gold content of this blank are far higher than those of similar products in major domestic arsenals, and have reached the ceiling level of [-].

After the cylindrical turning was completed, Zhuang Qianding stopped the machine tool, added a boring tool to the tailstock of the lathe, and then started the lathe again to perform the boring operation on the entire barrel blank.

Turning the outer circle and boring the inner hole, the dimensional accuracy of the mortar tube is not as good as that of the howitzer and cannon, and semi-fine boring can meet the demand.

Of course, this operation is impossible for the lathe in the arsenal.

After 15 minutes, the sound of the motor of the machine tool finally quieted down.

The boring process of the gun barrel blank was completed. Zhuang Qianding took out the measuring tools such as the inner diameter micrometer and the surface roughness comparison sample plate together with the lathe, and began to accurately measure the outer diameter and inner diameter dimensional accuracy of the gun barrel to obtain the inner and outer diameter surfaces. A series of data such as roughness, dimensional accuracy and error value.

"Xiao Lin, record the final acceptance results. The surface roughness of the test piece is about 0.7 microns, and the mirror effect is achieved. The dimensional accuracy of the inner diameter semi-finish boring is 60.03 mm, and the dimensional accuracy error value is within the tolerance range..."

Zhuang Qianding, who completed the accurate measurement, kept giving various data to Lin Wan beside him, and finally gave the acceptance result: "According to the above data, the machining accuracy of this lathe has reached the standard level of the new machine, and the main components and parameters In line with the requirements, three commissioning and acceptance have been carried out according to the regulations, and now it has passed the final acceptance."

The standard-level machining accuracy of the new machine is still far from the theoretical maximum machining accuracy of this machine tool, which requires a long run-in period.

But even so, the level of machining accuracy of the new machine is completely sufficient for use.

After processing, now, the whole barrel blank has become a real mortar barrel.

With a serious face, Lin Wan wrote quickly, using her exclusive shorthand method, to write down the final test results and related content given by Zhuang Qianding word by word.

"The final acceptance has been passed, and I announce the official start of this GROB lathe. Comrade Hu, you will be the first to get started. First, you will conduct external circle and boring, and carry out targeted training, and then gradually master the operation of this lathe. Temper." After Zhuang Qianding finished speaking, he turned to look at the five turners in front of him, and said to Juan, who had the best grades in the theory class.

Training workers, this is the route planned by Zhuang Qianding in advance.

Sharpening knives does not cut firewood by mistake. Zhuang Qianding can't handle a wide variety of parts processing by himself.

The skills training is divided into two aspects, one theoretical and one practical. Hu An’s theoretical assessment score for turning machining yesterday reached 92 points. The other four scored a minimum of 78 points and a maximum of 88 points. He is the only existence that has broken through the [-]-point mark. .

The content of the theoretical assessment is mainly based on the GROB lathe. Every lathe is required to fully grasp the performance and characteristics of this machine, and be familiar with the outer circle, end face, annular groove, cutting, drilling, reaming, reaming, boring, The theoretical content of more than ten kinds of turning operations such as cones and threads.

There is no need to say more about the actual operation, operate on the machine and accumulate experience.

"Yes, sir."

Hu An nodded respectfully, stepped forward, came to the operating position, was facing the entire machine tool, felt the breath of the big guy in front of him, and the whole person was a little nervous.

Although I have learned a lot of theoretical knowledge about this machine tool, it is the first time to get started.

"You got the best grades in the training exam, keep calm, and remember the essentials of operation I told you yesterday." Zhuang Qianding retreated to a safe distance, seeing the nervousness on Hu An's face, he said straightly.

Hearing this, Juan nodded earnestly, took a deep breath to keep calm, recalled what he had learned these days, and gradually regained his confidence.

After a few seconds, the eyes of the whole person are clear and bright. After adjusting the state, pick up the second barrel blank with both hands, place it in the main shaft, control the three-jaw chuck to fix it firmly, and then position and measure it according to the standard method. .

After doing this, Juan pressed the switch to start the lathe. When the dull and high-frequency motor sounded, the main shaft began to rotate, and the feed box was controlled to control the feed of the tungsten alloy turning tool. Relying on the accumulated turning experience in the past, he touched the barrel blank. On the surface, turn the outer circle of the barrel little by little.

Rough car first, then fine car, he can't do the top operation of Zhuang Qianding's combination of rough and fine.

The entire operation is rusty, slow, and standard.

"Not bad." Zhuang Qianding paid attention to Hu An's operation throughout the process, nodded with satisfaction, and affirmed it.

The other four turners stared at Juan's operation process, each with a serious face and a solemn demeanor, as if they were facing an enemy. Although they were veteran turners, in front of this advanced machine tool, they were almost indistinguishable from novices.

The only good thing is perhaps the operational experience accumulated during the Guantian Arsenal period.

At this moment, Juan, who was the focus of the crowd, did not dare to be careless and focused on nothing else. He kept his eyes on the barrel blanks in the lathe, and traces of metal shavings kept falling.

After more than [-] minutes, Juan controlled the lathe to stop, and the fast-rotating spindle stopped moving.

At this moment, the entire barrel blank has changed from its gray appearance to a silver-white form, as if it was covered with a silver coat. The surface is clean and smooth, but it does not reflect the mirror effect.

In addition, the inner hole of the gun barrel is enlarged, and the surface is the same as the outer wall, which is smooth and flat.

"Sir, I'm done, the diameter of the inner hole is 60.2 mm..." After completing the first practical operation on the machine, Hu An took out the inner micrometer, accurately measured the dimensional accuracy and other data, and then recorded the dimensional data one by one, and then asked Zhuang Qianding reported.

The inner diameter of the gun barrel is ±0.3 mm. Although the inner diameter of the gun barrel processed by Juan reaches 60.2 mm, it is still a qualified product.

Zhuang Qianding smiled and encouraged: "It is very good to be able to process it like this for the first time. You can summarize the operation experience and have the opportunity to become a mechanical engineer in the future. Comrade Zhao, come here."

Although these car workers are old, their average age is only about 28 years old. Juan is smart, spiritual, and good at learning and summarizing. If he continues to develop, he may not be able to change from a worker to an engineer.

"Yes!" Hu An was excited when he heard Zhuang Qianding's evaluation, kept calm, and responded in a straight voice.

Mechanical Engineers!
This is a career that many people dream of, and Juan never thought that he would have the qualifications to become a mechanical engineer.

Immediately afterwards, Zhao Cheng, who was No. 2 in theoretical achievement, raised his hands in salute, and stepped forward to start practical training. Not long after, the sound of the motor running again sounded in the turning workshop.

……

Time passed by and the sky was getting darker.

After about five hours of rotation practice training, the five members of the turning group have basically mastered the operation process of GROB machine tools, and are familiar with the two processing methods of turning and boring.

"Today's practical training is here. After we go back next time, everyone needs to sum up their experience. Tomorrow we will start processing the air separation plant compressor unit and three-hole oxygen lance, which is the most important thing."

The workshop was quiet, Zhuang Qianding stood in front of the five members of the lathe team, looked around at everyone, looked at Li Nan and Zhao Cheng, and instructed: "Also, Comrade Li and Comrade Zhao don't blame themselves too much, machining is just like this, There are qualified products, and there are unqualified products.”

There is good news and bad news for the first rotation of hands-on training.

The good news is that there are fourteen barrels that have been processed to be qualified, and the bad news is that there are a total of two non-conforming barrels that exceed the maximum inner diameter tolerance.

Next, the qualified products are sent to the arsenal, and the unqualified products are returned to the furnace for remanufacturing.

Two unqualified products, one with an inner diameter of 60.4 mm and one with an inner diameter of 60.6 mm, although the inner diameter tolerance is not exceeded, the shells can be fired after plugging in, but Zhuang Qianding still classifies them as unqualified, which is absolutely not allowed. its troops.

In military production, there is no room for error.

Li Nan and Zhao Cheng in the lathe team looked helpless, with deep self-blame in their eyes. They didn't expect Zhuang Qianding to be so strict, especially Zhao Cheng, who processed the 60.4mm inner diameter gun barrel. Exceeding the tolerance by 0.1 mm, in the era of Guantian Arsenal...

What is 0.1mm?
This error is not important at all.

However, no matter how he begged Zhuang Qianding not to be classified as substandard, the final result was still the same.

Zhao Cheng didn't understand, but he didn't dare to get angry, and his inner emotions gradually turned into self-blame.

You must know that the organization is extremely difficult now. Many comrades in arms are not hungry and do not wear warm clothes, but he personally scrapped a valuable mortar barrel.

This feeling……

It almost suffocated him, unparalleled heartache.

This 1.2-meter-long gun barrel can be made into two mortars according to the 60mm length of the 600mm mortar in the arsenal, and two waste products are equal to four guns.

This is a full four doors!
Li Nan's eyes were full of self-blame and remorse. He didn't dare to get angry at Zhuang Qianding, who taught technology and knowledge, and he didn't dare to ask any questions. He could only blame himself why he was so nervous at the time.

However, there is no regret medicine in the world.

Hu An and others next to him are also distressed, and they want to return the two gun barrels of such excellent quality to the furnace and rebuild...

Heartache, really heartache.

"Okay, everyone..." Zhuang Qianding continued.

"Report, sir, I have a suggestion." Hu An pursed his lips, and when Zhuang Qianding was about to announce the rest, he suddenly raised his right hand.

"Tell me, if it's still about two substandard products leaving the factory, then there's no need to talk about it." Zhuang Qianding, who was interrupted, nodded, and immediately took a precaution.

"Sir, we think it's a pity that those two scraps are returned to the furnace for re-manufacturing, can we make them into mortars and sell them to others?" Juan took a deep breath and said the thoughts brewing in his heart.

Made into mortars to sell to others?
Hearing Hu An's idea, Zhao Cheng and Li Nan froze for a moment, and immediately raised their heads, the eyes of the other two workers lit up.

When Zhuang Qianding heard the words, his brows were slightly wrinkled, and he was about to refuse, but he stopped when the words reached his throat, pondered for a while, and said, "Tell me carefully."

"We use the good gun barrels that meet the tolerances ourselves, and the substandard gun barrels are still turned into mortars and sold to the Jinsui Army, or the Northeast Army, etc. My fellow in the Red Sixth Army said that in 36 years, there is a market for one. Gate Sixty had to demand [-] oceans, and now it may rise to [-] oceans, and if it is imported guns, such as those from Germany, the price may be even higher.”

Hu An said cautiously: "Look, 2 gun barrels make 4 guns, and if you calculate [-] oceans, there are [-] oceans. In this way, the problem of unqualified products in the factory in the future will be solved, and the problem of unqualified products in the factory will be solved. The organization makes money, after all, it is a pity not only for us to return such a good barrel to the factory, but also for other comrades.”

Good for yourself, bad for others.

In terms of quality alone, the two scrap barrels are definitely better than the mortars produced by the Taiyuan Arsenal, and the four guns sold for a minimum of [-] oceans.

There was a brief silence in the workshop.

The voice was in his ears, and Zhuang Qianding was lost in thought. He had to say that what Hu An said made sense. The thing he cared about most was that the waste gun barrels must not be installed in the army.

But if you sell it to someone else to use...

Regardless of performance constraints or other circumstances, in a word, it doesn't matter.

Looking at Zhuang Qianding's appearance, Hu An breathed a sigh of relief, and the other four all looked forward with anticipation.

"I understand, the two scraps will not be sent back to the electric furnace steel plant for the time being. I will go to the headquarters to discuss this issue with Director Chen. You should go back and have a good rest, and start processing the compressor unit parts tomorrow." With this thought, An raised his head to look at the five members of the lathe team and arranged them in an orderly manner.

"Yes, sir!" The five responded in unison.

Seeing this scene, Zhuang Qianding smiled without saying a word, turned around and left the turning workshop together with Lin Wan, and went to the headquarters of the Military Industry Bureau.

……

Military Industry Bureau Headquarters.

"That's the way it is. If the waste gun barrels are treated in this way, I think it is feasible. It is better to sell a mortar than to rebuild it." In the cave conference room, Zhuang Qianding informed Chen Kang of the news, Finally give your own evaluation.

After listening to it, Chen Kang felt his scalp numb and scratched his head: "Professor Zhuang, can't we really use this kind of gun barrel that is only 0.1 mm out of tolerance?"

0.1mm?

If the inner diameter exceeds 0.1 mm, it must be classified as a non-conforming product.

With Marx on top, Chen Kang felt like he was going crazy.

"Absolutely not. It involves military production, and there is no concession. This is a matter of principle." Zhuang Qianding nodded solemnly: "I don't care what others think, anyway, in my case, products that are out of tolerance must not be equipped with troops. If you insist on using it If so, then I'll go to General Liu, or the boss."

"..."

Feeling the tough attitude from Zhuang Qianding, Chen Kang moved his mouth and wanted to persuade, but looking at Zhuang Qianding's appearance, he had to nod and give in, with a wry smile, and said helplessly: "Don't get angry, I just feel bad. , I need to report the disposal method of waste gun barrels, with the consent of the boss, after all, this is the sale of arms."

There is nothing to say about this method of handling, and Chen Kang can accept it. Nowadays, the financial pressure on the organization is very high. If you make money from the waste gun barrels, you can greatly relieve the financial pressure of the organization.

Due to the Japanese army's all-out war of aggression against China, the prices of weapons and ammunition on the market have skyrocketed.

But just like that, there is still no market for it.

"I see."

Seeing this, Zhuang Qianding calmed down, and then gave the latest situation and future arrangements: "At present, the lathe group has been trained and has mastered the most basic operations. Next, I will lead them to process the compressor group and the three-hole oxygen lance. For spare parts, we will give priority to supplying Yulin Iron and Steel Plant, and then we will develop the single-cylinder diesel engine."

Chen Kang nodded: "Okay, is there anything I need to do?"

"No, technically you don't have to worry about it." Zhuang Qianding shook his head.

"..."

When Chen Kang heard the words, he was silent, and he could only look at Lin Wan, who was beside him: "Comrade Lin, how about the cement factory? Recently, the supply of cement produced by the vertical earth kiln is very tight. The Yushen and Yanma roads are often shut down. In addition, the construction of the pilot furnace of the Yulin Iron and Steel Plant has started, which also requires a lot of cement."

There are four vertical earth kilns in Liushugou, each with a daily output of 1.5 kilograms and a total daily output of [-] tons. There are three vertical earth kilns in Yulin, with a daily output of [-] tons of cement.

These cements are far from enough to satisfy the appetite of the two major highways, Yushen and Yanma. The Yushen Highway is 12 meters wide and has a mileage of about 200 kilometers. The construction team waited for food every day, just waiting for cement.

"It will take half a month for the first cement plant to be put into operation. The small rotary kiln will be completed soon, and the daily output is expected to be 25 tons. Yesterday, Comrade Zhao Zhangcheng organized a team to build three vertical earth kilns in Liushugou, and the daily output can be increased by 1.5 tons. Yulin side Three new vertical earth kilns will also be built." Lin Wan responded like a treasure.

During this period of time, she and Zhao Zhangcheng were almost in a state of continuous rotation. They were very busy, running back and forth between the cement plant and the various vertical earth kilns, providing technical guidance, and in addition, they also went to the side of Professor Zhuang to record data and study Knowledge.

Fortunately, the small rotary kiln at the cement plant is on the right track, the supporting facilities will be completed soon, and it will be officially put into operation in half a month.

Hearing about the cement situation, Chen Kang didn't give any instructions. Looking at the tiredness between Lin Wan's eyebrows, he said softly, "It's hard work."

"It's not hard, the real hard work is the soldiers who mine, the soldiers who drive the carriage to pull the goods..."

Lin Wan shook her head gently: "What I did can be said to be trivial."

Countless soldiers put down their guns, carried sand, gravel and cement on their shoulders under the scorching sun, doing all kinds of work.

Is she working hard?
No.

The real hard work is them.

"It's all hard work, don't say it like this, we'll see your credit." Hearing these words, Chen Kang was stunned for a moment, full of confidence in Lin Wan, and continued: "Okay, this briefing session will end here. , I will submit the disposal method of the waste gun barrels in writing immediately."

Zhuang Qianding and Lin Wan nodded, then left, busy themselves.

The soldiers of the Liushugou Arsenal are almost in two shifts, and all equipment hardly takes a breath unless necessary.

Everything, for construction, everything, for the future.

Soon after the two left, a confidential document was handed over to the cave. After a group of three discussed and decided, they finally agreed on the disposal method of this waste gun barrel.

At the same time, Liushugou Arsenal, which received the first batch of 60 qualified gun barrels, is preparing to manufacture the first [-]mm mortar attached to the organization.