Chapter 174 Process Problem
“You mean, there is something wrong with the EDM process?”
Zhong Shihong next to him showed an unbelievable expression:
“But In the past, the turbine blades of Turbojet 14 were produced in the same way, and there were no similar failures?”
“It may not be a problem with the processing technology itself.”
Chang Haonan habitually raised the turbine blade in his hand and pointed it at the light source, but it was obviously impossible to see anything with the naked eye, not to mention that this was a scrapped part:
“I think it’s more There may be omissions in the post-processing and inspection process.”
“This...”
Zhong Shihong still cannot accept this explanation:
“Turbine blades are the heat of aircraft engines. The core component of the end of the turbine. For this purpose, we have specially set up a set of inspection procedures to check the position of the opening, the diameter of the hole, the residual stress and deformation, as well as the burrs and flash edges of the hole. Only if they all pass can it be installed on the turbine disk. .”
"So, although the yield rate of manufacturing turbine blades is not high, I think the quality of the product should be guaranteed."
Looking at Zhong Shihong beside him who was explaining the quality inspection process quickly, Chang Haonan hesitated. For a moment, he did not directly express what he had just thought.
"I need a metallographic microscope with a probe."
It is meaningless to argue here. The right way is to find a sample and test it again.
"We do have a metallographic microscope here, but this scanning probe..."
An engineer in charge of testing next to him shook his head:
“We cannot produce multi-functional probes in China for the time being. If we import them, our military industrial units cannot buy high-end optoelectronic instruments and equipment.”
< br>Hearing this answer, Chang Haonan shook his head helplessly.
China's technological backwardness in this era is all-round, and many things are due to incompetence. It is difficult for him alone to solve such systemic problems in a short period of time. He can only think of other places. method.
“What about other units? Do you know which universities or scientific research institutions have this type of equipment?”
In the era before Chang Haonan was reborn, a place doing scientific research would only need a few similar electron microscopes, so he rarely paid attention to this kind of problem.
"Perhaps... you can ask Lianhai University of Technology or Lianhai Medical University?"
"I'll contact you."
The testing engineer just turned around quickly leave.
Although Zhong Shihong had different views from Chang Haonan, he did not stop him.
Everyone's ultimate goal is the same, which is to solve the technical risks that cause the turbojet 14B to malfunction.
No matter whose opinion is correct, everything will be known once the test results come out.
......
Neither of the two universities to be communicated with is under the Commission of Science and Industry, and after all, there are still confidentiality issues with the turbojet 14 turbine blades, so cross-system communication is It took quite a while, but it wasn’t until dinner that day that Factory 410 received a clear answer.
Lianhai Institute of Technology has a metallographic inspection microscope that meets the requirements, but according to the agreement reached with a foreign company when purchasing, this equipment and all related accessories cannot be moved, so the sample needs to be brought Past detection.
In the 1990s, there were not many people flying. Even for official or business trips, most people only chose to fly when traveling far away. Therefore, even though Shengjing and Lianhai are both large-scale cities, they still do not fly every day. flight. Therefore, it was not until a few days later that Chang Haonan and Zhong Shihong boarded a plane to Lianhai with several engineers and two finished turbine blades randomly selected from the production line.
A Cessna 208, nicknamed "The Caravan."
Small aircraft, which are not even considered regional aircraft, are actually generally used in general aviation abroad.
In fact, Chang Haonan didn’t even recognize the plane at first, but simply thought it looked familiar.
It wasn't until after he boarded the plane that he glanced at the escape manual placed behind the front seat before taking off that he determined the specific model.
I also remembered the familiar source——
When I was reborn more than half a year ago, in Liu Hongbo’s aircraft design class, the seaplane design presented by Huang Zhiqiang’s group was It was modified based on this aircraft.
It’s just that the one he’s riding now is an extended one that can accommodate 14 passengers.
“I didn’t know before that Northern Airlines had so many small Cessna aircraft.”
As the plane took off and climbed, Chang Haonan looked down from the port window and discovered that many of the same models were parked on the apron next to them, all with the same painting.
“Many airlines have been doing this over the years.”
Zhong Shihong, who was sitting next to him, answered as he wrapped himself in the blanket he asked from the flight attendant before getting on the plane. :
“There are also slightly larger feeder models that are also very popular, such as the MA-60 that you have participated in before, Bombardier’s CRJ200, and the EMB145 that has just been put into operation by Embraer. The quantities are not the same. Less.”
Chang Haonan was shocked when he heard this statement:
"Aren't you going to lose your life if you operate so many small planes?"
It's not possible to do any serious work on airplanes these days, so the two of them can only pass the time by chatting here and there.
“How is that possible?” Zhong Shihong also asked in confusion:
“The current mainstream prediction for air passenger transport in the new century is to use small short-distance passenger planes to gather passengers to regional central cities. Then, super-large passenger aircraft will connect these central cities, and the demand for regional aircraft and general aviation is expected to be very large.”
“So in the past two years, Embraer and Bombardier have been developing a new generation of regional passenger aircraft. ERJ190 and CRJ700, as for Boeing and Airbus, the research and development focus is on those ultra-long-range mainline passenger aircraft.”
After being reminded by the other party, Chang Haonan finally remembered that in the 1990s, there was a trend that the future development direction of passenger aircraft would be very big or very small, which made several major technology manufacturers And took many detours.
It was not until the new century came that everyone discovered that the reality was completely different from their imagination.
No one wants to go through so many transfers, so they will try their best to choose direct flights, and the growth rate of air passenger traffic is far faster than expected, especially in places like China and North America, even if they are two non-major Routes between cities are also worthy of being operated by small mainline passenger aircraft.
So ultra-long-range or ultra-large giants such as the Boeing 777 and Airbus A380 quickly fell out of favor. Before Chang Haonan traveled through, there were very few passenger flights operated by these models.
As for the regional airliner that once had high hopes...
It is not difficult to see some clues from the fact that Bombardier and Embraer have sold themselves to Airbus and Boeing respectively.
Of course, if we only look at the results, 150-180-seat models such as Boeing 737/Airbus A320 have always been the absolute rulers of the market, but for a short period at the turn of the century Over time, their status in the minds of airlines and aircraft manufacturers has indeed experienced certain ups and downs.
And this seems to be an opportunity that can be exploited.
(End of this chapter)