Suddenly, the people present did not dare to speak, and the seriousness of this problem really made people feel suffocated.
"This..."
Zhong Ming also hesitated, "Okay, okay, then let's sample and test together tomorrow, I believe our products are fine!"
” The processing technology of titanium alloy bolts, in fact, is not only known by Shen Huan, but also by Yu Tao and Sun Chengming.
If there is a defect in the appearance, how can it be blamed on the blank?
Only problems with the processing process can lead to this.
It is important to know that titanium alloy has high and low temperature resistance, corrosion resistance, non-magnetic and non-toxic, good air absorption performance, low density, low elastic modulus, strong damping performance, and tensile strength is greater than yield strength.
This supplier was a state-owned enterprise a few months ago, it has many years of experience in the titanium alloy products and fastener industry, and also has a number of patents, and is one of the few professional titanium alloy parts suppliers in China Shipping.
In fact, titanium alloy parts are more used in aircraft.
For example, titanium alloys are used in the engine components, skeletons, skins, fasteners and landing gear of aircraft.
This is because the performance of titanium alloy is determined, which is based on titanium and added to the alloy composed of other elements, of which titanium alloy has titanium aluminum alloy, titanium copper alloy, titanium manganese alloy and other 70 kinds of metals containing titanium elements.
The density of titanium alloys is generally about 4.5 grams per cubic centimeter, which is only 60% of steel, and some high-strength titanium alloys exceed the strength of many alloy structural steels.
Therefore, the specific strength of titanium alloy is much greater than that of other metal structural materials, and parts with high unit strength, good rigidity and light weight can be produced.
In history, Mao Bear has also built all-titanium alloy submarines, that is, the famous Alpha class, which has set many world records for submarines, but it is also a submarine that has had a major quality accident, that is, because of quality problems, the battery system short-circuited and caused a fire The unlucky submarine.
At that time, in order to reduce the displacement of the boat and increase the depth of diving, the Alpha class used titanium alloy to make the hull, and it and the S class are the only two military submarines in the world that are made of titanium alloy and in service.
Because the strength of titanium alloy is much greater than that of ordinary boat degaussing steel, the pressure resistance of the titanium alloy shell is greater, and the titanium alloy has the advantage of low magnetism, which reduces the magnetic physical field effect of the submarine and makes it more difficult to be detected by the magnetic detector of anti-submarine aircraft.
Because of the use of expensive, but very strong titanium alloy hull, the ultimate depth of this submarine is much higher than that of ordinary submarines, which can dive to 700 meters, while ordinary submarines are only 300 to 400 meters.
Of course, there are many places where titanium alloy bolts are used, and there are titanium alloy bolts on many machines, of course, there are different requirements when choosing blanks.
For example, if you want to customize wear-resistant and hardness bolt fasteners, it is best to use titanium-copper alloy bolts.
If it is necessary to require bolt fasteners to have the characteristics of a certain alloy in a special environment, then a titanium alloy metal with certain characteristics must be selected.
The sturdy parts used in the power compartment of the new conventional submarine are special, and they are specially formulated titanium alloy materials, so Zhong Ming, the representative of the supplier, will push the problem to the blank.
But at this time, the young military representative said loudly: "You suppliers know how to push, and I have also thought about this problem, but I process these bolts and solid parts of the blank, one of our colleagues checked, I asked him, it is through the inspection and acceptance of the authoritative organization, there can be no quality problems!"
” "So, you suppliers should think about it, is there a problem with your processing technology.
If these fasteners are unqualified tomorrow, then you have to re-ship the goods, this time we can not afford to delay, affecting the construction period, when your company is sold can not afford to lose!
The young military representative was not polite at all.
This sentence fell on the heads of the supplier representatives like a bomb.
Their faces are almost green, if it really doesn't work, the construction period is delayed, and their boss can't explain it, after all, this is a military product, a key model of the country, if something goes wrong, it may even be sentenced.
Shen Huan thought about it, there is indeed a 99% possibility that this problem is due to the processing technology.
Because of the processing and manufacturing of titanium alloy bolts, the requirements for the process level are very high.
Because the processing performance of titanium alloy materials is relatively poor, it is easy to produce defects such as hydrogen embrittlement and cracks during processing, because of this, there are only a few manufacturers of strong parts that can process titanium alloy bolts in China, because they cannot meet the domestic demand, so many titanium alloy bolts are imported.
It's just that the sturdy parts of the new conventional submarine are special and cannot be imported, so they can only be handed over to domestic manufacturers to do, and this factory in China Shipping has been providing titanium alloy parts for military aviation factories before, so the special sturdy parts for the new conventional submarine have been given to this factory.
The reason for the problem this time is likely to be related to the transformation of the factory's system, and it is not uncommon for such a major change to lead to product quality problems.
Shen Huan judged that the depression on the bolt that was not easy to find was likely to be a crack, but even if it was a very fine crack, if it was ignored, it would slowly expand due to vibration and force in the future during use, which eventually led to fracture and failure of solid parts, which in turn caused a major quality accident.
Therefore, in these details, the military representatives have indeed done a good job, and they have not even let go of such problems that are difficult to find out.
Yu Tao looked at Shen Huan and said, "Comrade Shen Huan, tell me your opinion!"
” Shen Huan wasn't going to say anything, but now he had to say it.
Shen Huan looked at that Zhong Ming and said in a deep voice: "Zhong Gong, you guys are really careless this time!"
If the product quality is not done well, your sense of responsibility is really not in place.
Don't bully us people who don't understand the processing technology of titanium alloy bolts, in fact, I also know a little bit about it.
This kind of titanium alloy bolt processing is very difficult, because of this, there are few factories in China that can do it, which allows you to take this job!
” Shen Huan is not pretending, he did study it in depth in his previous life.
Therefore, Shen Huan also said: "Because the processing performance of titanium alloy is particularly poor, it is easy to have quality problems when processing bolts."
The first is the very common problem of hydrogen embrittlement.
It is manifested as a decrease in plasticity, an increase in strength, and when working below 93 degrees, the impact toughness decreases and becomes brittle, and under constant or continuous load, it is easy to produce brittleness, which causes the failure of strong parts, am I right?
” After speaking, Shen Huan stared at Zhong Ming's eyes tightly.