Final assembly workshop.

Honorably completed the maximum life test, this engine is here to complete the decomposition, the whole engine has been completely decomposed into a parts state, one by one, the parts, filled with a lot of inspection benches, a lot of parts, it looks black.

The parts have not been cleaned, and after more than 4,000 hours of testing, it is strange that the parts can be as bright as new, Li Tianfeng and Qiu Wen'an, as well as a large group of craftsmen, designers, everyone walked to the front of these inspection tables, and saw these parts, Li Tianfeng nodded.

With the cooperation of the inspectors, everyone began to check the parts, measured the dimensions, and recorded them one by one on a special form.

In addition to the size record, the parts are also photographed one by one with a high-definition camera, and several photos are taken of some key parts, and the photos are taken from different directions, and some worn parts and abnormal parts are clearly photographed.

These photographs will be important and very valuable information, and will be closely preserved along with these dimensional records.

Li Tianfeng came over this time, naturally not to see everyone's work, Li Tianfeng is ready to see with his own eyes the wear and tear of some key parts, this engine after more than 4,000 hours of testing, what is the condition of the parts, Li Tianfeng needs to grasp first-hand information.

Which parts need to be seen, which parts are not necessary to see, Li Tianfeng knew clearly in his heart, and when he came to the inspection table, Li Tianfeng sat down next to one of the tables, and on this table, a series of bearings on this engine were placed.

Due to the technical blockade, imported high-quality bearings are generally difficult to buy, and even if they can be bought in small quantities, they are generally expensive. And the supply is not stable, so the bearings used in the turboshaft D engine are basically localized.

Because the bearings used are domestic bearings, the quality is slightly poor, although full consideration has been given to the design of the engine, such as the most reasonable and adequate lubricating oil. Lower oil temperature, higher oil circulation speed, etc.

However, the life of these bearings is still not able to meet the ideal requirements in Li Tianfeng's mind, and has not seen the situation of the bearings and parts of the engine after more than 4,000 hours of testing, Li Tianfeng has a spectrum in his heart, if Li Tianfeng speculated that there was no mistake, it is precisely because these bearings first went wrong, the maximum life of this engine is 4685 hours. Otherwise, the life span may be longer, more than 5,000 hours.

Some relatively large bearings, at this time is not the overall state, but the state of the parts, the roller, the inner and outer rings of the bearing have been separated, Li Tianfeng picked up one of the main bearing balls. Seriously looking.

If it's a ball with a new bearing, it's very bright. There is no flaw on the surface of the roller, it is all metallic luster, and because the surface of the roller is too smooth, almost mirror, the light will also appear specular reflection, and some parts seem to be black.

Li Tianfeng is very experienced. Pick up this roller, take a serious look, after such a long time of testing, the surface of the roller has appeared tiny pitting, which is the roller fatigue wear. Metal spalling appeared on the surface.

After looking at several balls, the situation is basically the same, and then, I looked at the inner and outer rings of this bearing, especially the situation of the roller runway on the inner and outer rings of the bearing, which is the same, there have been pitting.

Then, Li Tianfeng looked at several bearings, all of which were badly worn, and many balls had pitted on the surface.

Sure enough, it was the bearing that had a problem first, otherwise, the maximum life of this engine would have been longer.

The quality of the bearing is so, then there are only two ways, the most effective way is to improve the quality of the bearing, but this is estimated to be difficult, Tianfeng Technology Company does not produce bearings, and the domestic bearing manufacturers, to improve the quality of aviation bearings in a short period of time, it is estimated that it is unrealistic.

The second way, that is, every time the engine is overhauled, most of the bearings are replaced, and new bearings are replaced, which is the simplest and the most able to ensure the subsequent use of the engine, but the cost is relatively high.

In foreign countries, countries with developed aviation industry, aviation engine is not to replace bearings every overhaul, but Tianfeng Technology Company has no way, if there is no high-quality aviation bearing, it can only replace the bearing of this engine every time the engine is overhauled.

Most of the domestic aviation enterprises are doing this, such as all kinds of aero engines in plant E, every time they are overhauled, they must replace a lot of bearings, so as to ensure the service life and quality of the engine after overhaul.

Of course, when the engine reaches the service life and returns to the factory for overhaul, it is also necessary to replace a lot of parts, which are divided into necessary replacement parts and even replacement parts. As the name suggests, it is a part that must be replaced, generally speaking, screws and nuts must be replaced, and some parts are easy to wear and tear, which must also be replaced.

Occasional replacement parts, as the name suggests, are parts that are replaced by chance, not parts that must be replaced, but parts that are replaced according to the actual situation depending on the use of engine parts.

After reading the bearings, Li Tianfeng thought in his heart that in the absence of high-quality aviation bearings, most of the bearings must be replaced every time the turboshaft D engine is overhauled.

Then, Li Tianfeng looked at a lot of important parts, especially those that are prone to wear and tear, after reading these parts, Li Tianfeng nodded with satisfaction, on the whole, the situation is completely within the expected range, and the overall situation is not bad.

At the same time, this also means that the turboshaft D engine is very good in terms of engine design and parts processing quality.

After grasping the first-hand information and looking at the situation of many parts, Li Tianfeng looked at a few more lubricating oil filters, and each lubricating oil filter had more or less metal shavings, which were worn by parts, especially the metal shavings from the wear and tear of the bearings.

The lubricating oil system of the aero engine is an independent circulation system, and the lubricating oil of the aero engine is also circulated, and the lubricating oil is pumped out of the lubricating oil tank and sent to each part that needs to be lubricated through various pipelines, and after lubrication, the lubricating oil is sent back to the lubricating oil tank.

This is a bit like the blood circulation system of the human body, the blood of the human body is also circulated, the heart is like a lubricating oil pump, and the blood vessels are like lubricating oil pipes.

Lubricating oil is circulated in the aero engine and plays a lubricating role at the same time, if the parts are worn and there are fine metal chips, these metal chips will be filtered down when they pass through the lubricating oil filter, and the metal chips will be collected in the filter.

Aero engines are used in the field, and the field maintenance personnel often have to pull out the filter when checking the engine to see if there are metal chips or foreign objects in the filter.

Li Tianfeng looked at these oil filters carefully, looked very carefully, and even took a magnifying glass to look at these metal shavings carefully.

Basically, it was all metal chips peeling off from the bearings due to wear, Li Tianfeng thought to himself.

Next to him, Qiu Wenan also held a magnifying glass and a flashlight, looking very attentively, Qiu Wenan also brought a pen and paper to take a look, and record some things from time to time.

Those technicians and inspectors take pictures from time to time, carefully measure the situation of each part, and record these details, and everyone works hard and is busy.

Overall, the engine after more than 4,000 hours of maximum life test, the situation is relatively good, the table of each part, basically within the satisfactory range, the only fly in the ointment is that these domestic bearing table xiàn is slightly worse.

Li Tianfeng stayed in the assembly workshop for a long time and looked at a lot of parts seriously, while Qiu Wenan stayed in the assembly workshop for several days.

………

Tianfeng Technology's turboshaft D engine was continuously sent to the helicopter manufacturing plant, and the inventory of more than 200 engines was finally sent away, and the huge warehouse was empty again, and the helicopter design institute and manufacturing plant were under the greatest pressure at this time.

The upgrade of Wuzhi Ten is imminent, the design is at full power, the armor scheme of Wuzhi Ten has been upgraded first, and the thick armor is fully reinforced, which can completely resist the blow of the 30mm cannon, because of the armor upgrade, the appearance of Wuzhi Ten has also undergone corresponding changes, and the appearance is more powerful, full of resolute lines, and more beautiful.

The optimized design of weapons is also being carried out, and the plan for installing radars is also being carried out, and the radar of Wuzhi 10 will be upgraded, and the radar will be more advanced and complex, and the weight will be increased by at least two or three hundred kilograms.

Tianfeng Technology Company has not stopped, the production of turboshaft D engines, the output of about 80 units per month is carried out smoothly, and the military's military trucks, in accordance with the original order agreement, transport 50 turboshaft D engines from Tianfeng Technology Company every month.

In December, dozens of turboshaft D engines were stored in the huge test workshop warehouse, Li Tianfeng did not slow down production, Li Tianfeng knew that the demand for domestic turboshaft D engines should be more than 2000 units, and he could rest assured that he could produce before reaching 2000 units.

In the office.

Li Tianfeng is personally packing up a few documents, which have been sorted out, packed, and put into his bag, and at the joint invitation of the helicopter design institute and the manufacturing plant, Li Tianfeng will go to attend a special technical seminar, a technical seminar on Wuzhishi.

………

Today's two watches, the second one will be sent.

Tomorrow I will strive for the resumption of the third watch, and here I will shout again about the monthly pass, and recommend the support of the ticket. (To be continued......)