Assembly workshop.

The maximum life test run was completed, and the engine was successfully decomposed here. The entire engine had been completely decomposed into parts. Each part was filled with many inspection tables and many parts, looking black and black.

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

Everyone didn't need Li Tianfeng's instructions, so they naturally knew what they were going to do. With the cooperation of the inspectors, everyone began to inspect the parts, measure the sizes, and record them one by one on a special table.

In addition to size recording, the parts are also taken one by one with a high-definition camera. Several key parts are also taken, and several photos are taken from the unused direction. Some worn parts and abnormal parts are clearly taken.

These photos will be important and very precious information, and will be kept closely together with these size records.

Li Tianfeng came here this time, of course, not to look at everyone's work. Li Tianfeng was preparing to see the wear and tear of some key parts with his own eyes. After more than 4,000 hours of test drive, how are the parts in the engine? Li Tianfeng needs to have first-hand information.

Li Tianfeng knew clearly what parts needed to be seen and which parts were not necessary. When he came to the inspection table, Li Tianfeng sat down next to one of the tables. On this table, a series of bearings on the engine were placed.

Due to technology blockade, imported high-quality bearings are generally difficult to buy. Even if you can buy a small amount, they are generally expensive and the supply is unstable. Therefore, the bearings used on the turboshaft D engine are basically domestically produced.

Because the bearings used are domestic bearings, the quality is slightly poor, although the engine design has been fully considered, such as the most reasonable and sufficient lubricating oil, the use of a lower lubricating oil temperature, the circulation speed of lubricating oil is increased, etc.

However, the life of these bearings still cannot meet the ideal requirements in Li Tianfeng's mind. Li Tianfeng has not seen the situation of each bearing and parts of the engine after more than 4,000 hours of test drive. If Li Tianfeng speculated that there was no mistake, it was because these bearings first had problems. The maximum life of this test drive of this engine is 4,685 hours, otherwise, the life time may be longer, and it is possible to exceed 5,000 hours.

Some larger bearings are not in the overall state at this time, but in the state of parts, rollers, inner and outer rings of bearings, etc., have been separated. Li Tianfeng picked up the balls of one of the main bearings and looked serious.

If it is a ball of a new bearing, it is very bright. The surface of the roller has no flaws, it is all metallic. Because the surface of the roller is too smooth and almost mirrored, the light will also have mirror reflections, and some parts look black.

Li Tianfeng was very experienced. He picked up this roller and looked at it carefully. After such a long time of test run, slight pitting appeared on the surface of the roller. This was because the roller had fatigue and wear and peeling metal on the surface.

After looking at several roller balls, the situation was basically the same. Then, I looked at the inner and outer rings of the bearing, especially the focus on the roller track on the inner and outer rings of the bearing. The same is true, there have been pitting.

Then, Li Tianfeng looked at several bearings, and there were bad wear and tear. Many of the balls had pit spots on the surface. Li Tianfeng nodded and knew it.

Sure enough, it turns out that there was a problem with the bearing first, otherwise, the maximum life time of this engine would be longer.

If the quality of bearings is like this, there are only two ways. The most effective way is to improve the quality of bearings, but this is probably difficult. Tianfeng Technology Company does not produce bearings, and the domestic bearing manufacturers need to improve the quality of aviation bearings in a short period of time, which is probably unrealistic.

The second method is to replace most of the bearings with brand new bearings every time the engine is overhauled. This is the easiest and the most guaranteed subsequent use of the engine, but the cost is relatively high.

In foreign countries with developed aviation industry, aviation engines do not replace bearings every time they are overhauled, but Tianfeng Technology Company has no choice. If there is no high-quality aviation bearings, it can only replace the bearings of this engine every time the engine is overhauled.

Most domestic aviation companies do this, such as the various aircraft engines of the e Factory. Every time they are overhauled, a lot of bearings have to be replaced to ensure the service life and quality of the engine after overhaul.

Of course, when the engine reaches its service life and returns to the factory for overhaul, it is also necessary to replace many parts, which are divided into necessary parts and sometimes replaced parts. As the name suggests, the required parts are parts that must be replaced. Generally speaking, screws, nuts, etc. must be replaced, and some parts are parts that are prone to wear, which must be replaced.

As the name suggests, occasionally replaced parts are parts that are replaced by chance, not parts that must be replaced. They are parts that are replaced according to the actual situation depending on the use of engine parts.

After reading the bearings, Li Tianfeng thought to himself that in the absence of high-quality aviation bearings, most of the bearings must be replaced every time the turbine shaft D engine is overhauled.

Then, Li Tianfeng looked at a lot of important parts, especially those that are prone to wear. After reading these parts, Li Tianfeng nodded with satisfaction. Overall, the situation was completely within the expected range, and the overall situation was pretty good.

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

After mastering first-hand information and looking at a lot of parts, Li Tianfeng looked at several lubricant filters. Each lubricant filter had some metal chips, which were worn by the parts, especially the metal chips peeled off from the wear and peeling of the bearings.

The lubricant system of an aircraft engine is an independent circulation system. The lubricant of an aircraft engine is also used in circulation. The lubricant pump pulls the lubricant out of the lubricant tank and sends it to each part that needs lubricant through each pipeline. After lubricating, the lubricant is sent back to the lubricant 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 lubricant pump, and the blood vessels are like lubricant pipelines.

The lubricant is recycled in an aircraft engine and plays a lubricating role. If the parts are worn and there are fine metal chips, these metal chips will be filtered when they enter the lubricating oil filter and blocked by the fine filter net in the filter, and the metal chips will gather in the filter.

When an aircraft engine is used in an outdoor field, the outdoor field maintenance personnel often need to pull out the filter when checking the engine to see if there are metal chips or foreign objects in the filter. If these things are present, it means that there is a problem with the engine and you must find out the root cause of this problem.

Li Tianfeng looked at these lubricant filters carefully and looked very carefully. He even took a magnifying glass and looked at these metal chips carefully. Experienced people can tell that these metal chips are from the parts of this engine by looking at these metal chips.

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

Next to it, Qiu Wen'an also held a magnifying glass and flashlight, looking very focused. Qiu Wen'an also brought a pen and paper to take a look, and recorded some things from time to time.

The technicians and inspectors took photos from time to time, carefully measured the situation of each part, and recorded these in detail. Everyone worked hard and were busy.

Overall, the engine has undergone a maximum life test run of more than 4,000 hours, and the situation is quite good. The performance of each part is basically within a satisfactory range. The only disadvantage is that these domestic bearings perform slightly worse.

Li Tianfeng stayed in the assembly workshop for a long time and carefully looked at a lot of parts, while Qiu Wen'an stayed in the assembly workshop for several days. Qiu Wen'an carefully looked at many parts and made detailed records.

………

Tianfeng Technology's turboshaft D engine was continuously sent to the helicopter manufacturing plant. More than 200 engines in stock were finally sent away. The huge warehouse became empty again, and the helicopter design office and manufacturing plant were under the greatest pressure at this time.

The upgrade of Martial Arts Ten is imminent, and the design institute has made full use of the full power. Martial Arts Ten's armor plan has been upgraded first, and the thick armor is fully reinforced and can fully withstand the attack of 30mm cannons. Due to the armor upgrade, Martial Arts Ten's appearance has also undergone corresponding changes. From the appearance, it is more powerful, with firm lines, and more beautiful.

Weapon optimization design is also in progress, and the radar installation plan is also in progress. The radar of Marine Ten is upgraded and replaced, so that the radar is more advanced and more complex, and the weight will be increased by at least two or three hundred kilograms accordingly.

Tianfeng Technology Company has not stopped production. The production of turboshaft D engines is carried out smoothly with about 80 units per month. Military military trucks transported 50 turboshaft D engines from Tianfeng Technology Company every month according to the original order agreement.

By 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 domestic demand for turboshaft D engines should be more than 2,000 units, and before reaching 2,000 units, he could produce them with confidence.

In the office.

Li Tianfeng is personally packing up a few pieces of information. These pieces of information are sorted out, packed, and put into his bag. At the joint invitation of the helicopter design institute and the manufacturer, Li Tianfeng will attend a special technical seminar and a technical seminar on Wu Zhishi.

………

Two updates today, and the second update will be given.

We will strive to resume the third update tomorrow. Let’s call for monthly tickets again here and support for recommended tickets. (To be continued)
Chapter completed!