Chapter 365: Immortal Party A
Gao Zhendong didn't know what to say for a moment. His understanding of this thing was limited to what he had read in books, but he still explained everything he knew to the general manager.

"Mr. Xiang, that's not the case. There is a huge difference between twin-screw and single-screw."

Anyway, this thing already exists at this time, so he can say whatever he wants. The only thing to ask is that you read a lot of books, remember it well, and use it well. As for whether many detailed technologies exist at this time, how can people in China verify it?
A major difference between a practical twin-screw and a single-screw is that the driving force and mechanism of material advancement are completely different from those of a single-screw.

The material in a single screw seems to be pushed forward by the screw groove. In fact, the implicit requirement is that the friction between the material and the screw groove must be greater than the friction between the material and the inner wall of the machine.

In this case, the extrusion speed of the material does not change linearly with the screw speed. The most disgusting thing is that when the screw speed remains unchanged, the extrusion speed of the material will also change due to changes in other conditions.

This leads to a problem. The extrusion speed of the material of this machine is generally not very controllable, or in other words, the controllability is poor and the controllable window is not large.

At the same time, since the screw groove of the single screw is continuous, the material will form two continuous spiral ribbons of a long molten pool and a solid bed in the entire screw groove. In this way, uniform heating and mixing are naturally out of the question. By the time the solid bed disappears and all the materials form a molten pool, it is almost the end.

The twin screw is different.

There is a kind of non-meshing twin-screw, which is quite similar to what Mr. Xiang said. It is almost double the single-screw and has basically all the disadvantages of the single-screw.

But when the twin screw extruder uses intermeshing twin screws, the situation changes dramatically.

Simply put, the meshing twin-screw divides the material into small, unconnected pieces through the clever meshing of the threads on the two parallel screws. As the screws rotate, the material is forcibly transported forward. The power of transportation does not rely on friction, but on forced transportation.

If you really can't figure it out, you can imagine that the material is being sent forward one spoonful at a time.

That is to say, the continuous material is divided into pieces. This can also be regarded as an alternative way of dealing with indecision, quantum mechanics.

This brings many benefits. The material extrusion speed can be controlled at once. The faster it rotates, the faster it is extruded, and the speed is controllable.

Moreover, the material that is strictly fixed in small pieces can be heated evenly, and even the mixing screw can be directly designed for mixing. Different screw block combinations can be used to provide shear force, so that the material can achieve a high mixing degree state, which is very considerate.

Of course, it is not without disadvantages. The conveying process is throttling, which will cause pulsation of extrusion pressure. However, the good news is that this situation can be weakened or even eliminated through reasonable design.

Gao Zhendong was not clear about the details and in-depth theories, but he could still explain the superficial things clearly and remembered a lot of related superficial things. This was enough for Mr. Xiang and others. They lacked ideas, but their brains were not bad.

After all, Mr. Xiang is a specialist in this. Although he is not responsible for the extruder itself, he still knows how to analyze the principles. After listening to Gao Zhendong's introduction, he pondered for a while. What Director Gao said seemed to make sense.

At least in principle, there is no problem found, so give it a try and maybe it will work.

He knew very well that if what Director Gao said was correct, once this thing was developed, it would not only be used for the processing of ABS tubes, but could be used as a general processing technology for the processing of other materials.

It's worth doing, not just for Director Gao's project.

Mr. Xiang thought about it for a long time and felt that there was nothing wrong. He was in a very good mood. It had to be Director Gao, who had a wide range of knowledge and the solutions he came up with were even better than those of himself who specialized in this.

"Director Gao, I will go find the comrade who works on the extruder and ask him to give it a try. If it is true as you said, you have inadvertently helped us solve a big problem. Thank you so much."

Besides being happy, I also feel a little guilty. It's like taking on a project and being unable to solve it myself, the client has to take action personally.

Party A is a god-like Party A, and they did get a bargain, but they are still a little embarrassed.

Gao Zhendong smiled and said, "I hope it can be solved. This is basically all we need now. By the way, it is best to use corrosion-resistant nickel-based alloys for the screw block, screw barrel and other parts of this thing. The working temperature is estimated to be not low. The corrosion resistance of ordinary materials will drop sharply under high temperature."

President Xiang had no doubt about Gao Zhendong's words. This question went back to Director Gao's area of ​​expertise.

In this case, let's use urea steel first. At least in his hands, this is the most corrosion-resistant steel known.

Okay, back again.

Before hanging up the phone, President Xiang tried to save his reputation: "Director Gao, although the barrel is not good enough now, the sight is fine. I have processed hundreds of sets and will send them to you through a special channel immediately. By the way, there are a few qualified barrels, which will also be sent to you. At least to support you in conducting the experiment first."

Gao Zhendong thought it was fine, at least he could test the sight first. He didn't need to send it to him, he asked General Xiang to send it directly to Changjian Machinery Factory, and he would call General Luo to explain it later. After hanging up the phone, General Xiang immediately ran to find the comrade in charge of the extruder and repeated Gao Zhendong's reminder to him.

After hearing what General Xiang said, this comrade first thought blankly for a long time, then showed a look of surprise and his mouth opened wide.

"It looks like this thing has better mixing, reaction, exhaust and self-cleaning functions than a single screw. A simple change of thinking can completely change the working principle of the screw extruder and solve many inherent defects of the single screw extruder."

After all, the other party was a specialist in this field. After just a moment's thought, he had figured out the whole thing almost exactly, and he also saw more things that Gao Zhendong could not see.

As soon as he saw his expression, President Xiang knew that there should be no problem.

"Looking at you, do you think their suggestion is feasible?"

The other party immediately held General Xiang's hand and said, "Mr. Xiang, you must thank the comrade who proposed this plan for me. His simple words solved a big problem! How could I not think of this? Oh, I still need to learn, I still need to learn."

President Xiang smiled and said, "Thank you very much. Do you think this can be done?"

"I will immediately ask the higher-ups to set up a project. This thing can be used not only by you but by others as well. Don't worry, I can't think of this way, so I can't solve it. But if someone points out the way and I still can't go there, then I'm really useless."

As a mechanical expert, he naturally had his own judgment on his profession. President Xiang was relieved, but he still reminded him, "Then write the report quickly and I will sign it with you. Oh, and don't forget to put his name in it. If it weren't for his words, I don't know how long you would have to rack your brains."

"Yes, of course! By the way, what is this comrade's name and which unit he is from? I can write it down in the report."

Huh? Oops!

This question made Mr. Xiang silent all of a sudden. I don’t think I can tell you the name of this comrade.

"Ah, this. Ah, this, that, you can just write an outsourced expert. I really can't tell you the name of this person right now. This is such a fuss."

The comrade working on the extruder was not a fool. Seeing Mr. Xiang like this, he probably knew the reason and started laughing. Mr. Xiang himself couldn't help laughing, and the two of them laughed together like a pair of Maitreya Buddhas.
-
Somewhere in Beijing, at the Standards and Regulations Bureau, they are now holding a meeting to review an application for the preparation of a national standard.

The Bureau of Standards and Regulations, whose full name is the Bureau of Standards and Specifications, is affiliated to the National Technical Committee (NTC).

There were not many people doing this these days. The first serious national standardization work conference was held in 63. From the establishment of the Standardization and Regulation Bureau in 57 and the release of GB58 in 1 to 66, only more than 1000 standards were formulated nationwide.

Even so, a considerable part of it was not done until after 63, because the first serious standardization development plan was not formulated until April 63, and the Standards Publishing House was not established until 4.

As for this time in the 60s, to be honest, we can't say that there was nothing in the standard work, but at least not much emphasis was placed on it. In 1958, the country promulgated the first batch of national standards, totaling 120 items. In 1960, 103 industry standards were promulgated, all for the machinery industry. Those 120 national standards were all fasteners, including seven major categories of products such as bolts, nuts, screws, wood screws, washers, rivets and pins.

It seems a bit tear-jerking that the first step of our standardization work is so stumbling.

As for the rest, there are only some standards used by the Russians in translating in the early days of the People's Republic of China.

Therefore, the Bureau of Standards and Regulations attaches great importance to the very few talents who have taken the initiative to apply to the Bureau of Standards and Regulations for the task of compiling national standards in these years, and all the top leaders were present at the meeting.

Another reason why they attach so much importance to it is that the applicant of this application is from a prominent background and looks very reliable.

The 17th Ministry of Machine Building, the 12th Ministry of Machine Building, and the Postal and Communications Commission jointly submitted the application!
To be honest, even if these units applied individually, they would be heavy enough, not to mention a joint application.

As a subordinate unit of the National Technical Committee, the Bureau of Standards and Regulations is very clear about the outstanding performance of the 17th and 12th Ministries of Machine Building in science and technology in the past six months.

If the two of them join forces, plus the Postal and Communications Commission which controls the national communications, the amount would be absolutely super heavyweight.

In front of them was the application document for the national standard compilation of the "Guidelines for the Compilation of Software Development Documents". The 12th Ministry of Machine Building and the Postal and Communications Commission acted quite quickly.

(End of this chapter)