Chapter 179 Domestic Sibei is saved!
With the help of the system, the entire numerical simulation process went more smoothly than Chang Haonan expected.
The design of the discrete element simulation software took about a week, but sharpening the tool did not waste time cutting wood. The software created under the system buff was very efficient, and it was quickly adapted to the actual conditions of several typical workpieces. According to the situation, the optimal solution was found by comprehensively considering the processing efficiency and polishing effect.
The abrasive material is silicon carbide particles with an average particle size of 400 mesh, and the fluid is prepared by using aviation kerosene as the base, and adding a certain amount of suspending agent, emulsifier and antioxidant.
This formula is very versatile and can be used on most deep holes and variable-diameter pipe workpieces.
Chang Haonan even spent an extra day to complete the design of the PLC program.
This program is also the top priority of the abrasive flow processing system.
Because soft abrasives are not as "obedient" as grinding wheels, it is easy to cause over-processing, that is, after the remelting layer has been removed, the base material on the inner wall of the air film hole continues to be ground. , eventually leading to scrapping of the workpiece.
A good PLC program can avoid this problem to a large extent.
On the other side, although Han Youde looks a little arrogant, he does have real talent and practical knowledge. He completed the overall design of the abrasive flow equipment in only three days. When Chang Haonan While the abrasives and PLC program were being finalized, the equipment at the Shengjing No. 1 Machine Tool Factory also went offline as the masters worked in three shifts overnight.
Zhong Shihong was so happy that he was almost smiling these days——
Since the application he submitted has been approved, the Seiko Project has officially been "established."
And considering the huge impact this plan may have in the future, the superior departments directly promoted it to a national-level project led by the Committee of Science and Industry.
Even Chang Haonan, who had no official position, was designated as "General Technical Consultant" by Ding Gaoheng.
As the flagship of the entire plan, this abrasive flow processing equipment has naturally received considerable attention.
The grinding process may seem inconspicuous, but it is actually an essential part of the finishing process.
So almost all units participating in the Seiko Project sent technical personnel to see with their own eyes the new tricks produced by Factory 410.
In the following day, the raw materials on the list were purchased one after another and transported to the 410 Factory. After a series of processes such as emulsification, stirring, and blending, they finally formed a lead-gray paste-like semi-solid, which was then poured into In the abrasive tank that has been prepared.
Operators begin the last technical inspection before starting up the equipment.
Because there were so many onlookers and a necessary safe distance was maintained between the production equipment and the production equipment, many people could only take a glance at it from a distance.
"Is that black thing the core technology they developed?"
An old engineer with half-white hair was a little skeptical.
Soft abrasives look like a lump of half-melted ice cream, and they really don’t look that good.
And in general understanding, the process of "grinding" is to use a harder thing to remove a softer thing. Soft abrasives will indeed have an impact on the traditional concept.
Judging from the temporary pass hanging around his neck, he is from Bingcheng Boiler Factory.
This factory does not burn boilers, but makes boilers. Most of the coal-fired boilers used for power generation in the country and many power boilers supporting steam turbines come from here.
Recently, they are bidding for a power boiler production project for a new guided missile destroyer, but they have always been troubled by insufficient processing and manufacturing capabilities, and several key indicators cannot meet the requirements.
At this most critical juncture, the news came that the Science and Technology Commission was presiding over the launch of the Seiko Plan. Bingcheng Boiler Factory almost rushed to get on the bus at the last moment before closing. For the 410 Factory, There is relatively little understanding of the situation.
“Yes, I heard a report last night. They said that it can increase the polishing efficiency of irregular surfaces by more than 5 times, and it can also handle difficult workpieces such as deep inner holes and variable-diameter pipes.”
The other engineer next to him from the 408 Factory of Shaanxi Diesel Heavy Industry was much more comfortable.
Their situation is similar to that of Bingcheng Boiler Factory. Recently, they were responsible for the licensed production of diesel engines from MTU Company. However, the crucial localization rate indicator was stuck at a threshold and was unable to make further breakthroughs. So after learning that This Seiko project required participation from the first moment, and a large amount of project funding was also provided.
"I'll go, 5 times...can't be a satellite?"
"Just watch, it shouldn't take too long."
Just watching the crowd During the discussion, the trained technical workers had completed loading and setting the processing program.
This process was originally planned to be operated by Chang Haonan himself, but the latter believed that workers with ordinary education levels could better demonstrate the advantages of this "fool-like" software.
The lubricating oil elbow on a turbojet 14 is tightly fixed by a clamp——
The 410 factory itself does not have the ability to conduct metallographic inspection of the inner wall of the air film hole, so in order to more intuitively display the grinding Regarding the ability of particle flow processing, Zhong Shihong and Chang Haonan finally decided to use a variable-diameter bent pipe that is equally difficult to process to obtain the "first blood" of this equipment.
To be precise, it should be half a piece, because a part of it was cut off from the front and will be used to compare with the situation after processing.
The start button was pressed, and the compressor made a buzzing sound.
There seemed to be no change at first, but after about ten minutes, toothpaste-like waste abrasive began to be squeezed out from the preset drainage holes around the clamp.
The workers who had been waiting for a long time immediately began to fill in the prepared new abrasive.
Processing continues.
No one present felt bored. For such a complex workpiece polishing process, it is normal for it to last several hours.
……
After about 50 minutes, the clamps were opened.
There seems to be no change in the appearance of the workpiece after being washed with aviation kerosene.
"It's less than an hour...Isn't there not enough time?"
"If the efficiency is five times, it will be about the same..."
Operation The workers were not disturbed by these discussions:
"Get on the cutting machine!"
The inner diameter of the lubricating oil pipe is enough to directly insert the probe into it for surface roughness testing, but from an intuitive perspective, it is definitely better to cut it directly.
The two workpieces, polished and unpolished, were quickly split in half from the middle.
Under the factory lights, you can see the difference even with the naked eye.
The inner wall of the workpiece on the left is so bright that it can almost be used as a mirror.
Of course, for the sake of rigor, the tests that should be done must still be done.
"The average roughness Ra value of the inner wall of the workpiece before polishing is 1.466."
Chang Haonan personally went into battle and read out the first test result displayed on the screen.
The crowd of onlookers who were still discussing just now returned to silence.
Everyone is waiting for his next words.
"The average roughness of the inner wall of the workpiece after polishing..."
"Ra value = 0.367!"
The surroundings almost fell into a boil instantly -
"I'll be nice ..."
"Really so fast?"
"..."
On the other side of the crowd, several men wearing aviation industry work clothes looked at the machine in front of them with almost shining eyes.
As a brother unit within the system, it is natural for them to receive some special treatment when visiting, so they can observe the entire process from a better angle and closer distance.
"Gong Zhang, this..."
A younger engineer said in a voice that was trembling with excitement:
"If this can be used, the localization of Sibei should..."
Obviously, they come from the 430 factory in Haojing.
Although the introduction and assembly of the Spey MK202 engine was completed in the mid-1970s, due to various reasons, the actual localization work went through many twists and turns, and it was not accepted until 1995.
It is said to be "localization", but in fact the localization rate of Sibei at this time is only 70%, and a large number of core parts are still imported from stocks more than ten years ago.
The yield is low and unsustainable.
Originally, when the Sibei technology was introduced, there were many conflicts between Hao Jing and Sheng Jing.
But as the original Spey engine on the JH-7 gradually reaches its end of life, the pressure on the former is also increasing day by day.
Especially since the Turbojet 14 made big news at the Xiangzhou Air Show some time ago, it would be absolutely false to say that I am not jealous or envious.
So Factory 430 didn’t care about the face issue and directly sent over a group of engineers responsible for Sibei’s localization project.
“It should be a big step forward!”
The middle-aged man known as Mr. Zhang said and punched the air in front of him:
“It is better to ask the 410 Factory to do things than to ask the British to do things.”
“I Go find Zhong Shihong in person!”
(End of this chapter)