universal repair shop

Chapter 132 We Want It All (Fourth)
"Mr. Fang, what's the test result?" Yang Xingjia couldn't help asking.

brush!Everyone looked at Fang Zu in unison.

Li Yuanfang and the workers are no exception. Although Li Yuanfang knows that Tianze has transformed the bearing production line, he is not a science talent after all, so he doesn't know how awesome Tianze's transformation is.The workers also didn't realize the difference between the produced bearings, and they were always produced as ordinary bearings.

"Accuracy level P2!"

Fang Zu said first.

The accuracy of bearings includes dimensional accuracy and rotational accuracy. Dimensional accuracy is the item required when installing the bearing on the shaft or bearing box, which includes inner diameter, outer diameter, width, chamfer dimensional tolerance or allowable value.Geometric accuracy includes allowable values ​​of inner diameter deviation, average inner diameter difference, outer diameter deviation, average outer diameter difference, and parallel difference of ferrule end faces.The rotation accuracy is defined as the vibration during rotation, including the radial and axial swings of the inner and outer rings, the side swing of the inner ring and the tolerance range of the verticality of the outer diameter surface.

精度等级从普通级0级到6级、5级、4级及2级，依次增高。

P0 is the lowest, and P2 is the highest. Generally, bearings above P5 have to be customized.

Hearing Jaycee Jaycee say that the accuracy is P2, although everyone is very excited.

But still restrained.

Because there are many domestic factories that can produce P2 bearings.

"2 sets of clearance!"

Fang Zu continued.

The clearance of the bearing refers to the amount of movement of the ring when the inner ring or the outer ring is fixed and the unfixed ring moves radially or axially when the bearing is not installed on the shaft or bearing housing.According to the direction of movement, it can be divided into radial clearance and axial clearance.

The size of the clearance (called working clearance) during operation has an impact on the rolling fatigue life, temperature rise, noise, vibration and other performance of the bearing.

而滚动轴承径向游隙共分为五组：2组、0组、3组、4组、5组，游隙值依次由小到大，其中0组为标准游隙。

Hearing Jaycee Jaycee talking about 2 sets of play, everyone didn't respond at all.

Because not all bearings require the minimum working clearance, you must choose the appropriate clearance according to the conditions.For example, the 0 group clearance is suitable for general operating conditions, normal temperature and commonly used interference fit; bearings working under special conditions such as high temperature, high speed, low noise, and low friction should use a large clearance group; for precision Bearings for spindles and machine tool spindles should use smaller clearance groups.

"The vibration acceleration far exceeds the Z[-] level!"

"The vibration speed exceeds level V[-]!" Jaycee Jaycee said two indicators in succession this time.

In an instant, there was a sound of heavy breathing.

Then, there was a burst of warm applause.

Everyone, whether it was Yang Xing's family, Li Yuanfang, or the workers, were all clapping their hands vigorously, their faces full of excitement.

Why are you all so excited?
All because the meanings represented by these two indicators are too special.

Bearing vibration refers to the elastic deformation of bearing parts changing over time and all other movements that deviate from the theoretical position except for the movement necessary for bearing function. It is divided into vibration acceleration (dB) and vibration velocity (μm/S).Vibration acceleration is divided into Z, Z[-], Z[-] and Z[-] three-level assessment, of which Z level is the basic level, and Z[-], Z[-] and Z[-] represent the bearing vibration level from low to high in turn.

Similarly, the vibration speed is also divided into three levels of assessment: V, V[-], V[-] and V[-], of which V level is the basic level, and V[-], V[-] and V[-] represent the vibration level of the bearing in turn from low to high.

The domestic bearings are in these two aspects.

Always weak.

Compared with the Japanese bearing, the difference is at least 10dB, don't think that 10dB is not much, this is at least two levels of difference.In fact, our country is still using these two standards, and other countries have long since abolished them. This is enough to see the huge gap with foreign countries.

"The bearing DmN value is 4 times 106mm r/min." Jaycee's voice raised a lot again.

clap clap clap!
The applause that just fell was heard again.

Enduring.

Bearing DmN value = bearing pitch circle diameter (mm) (that is, the average value of bearing inner diameter and outer diameter) × rotational speed (rpm) is often used by bearing manufacturers as a measure of bearing speed, and is an indicator of high-speed spindles.The reason why everyone is so excited is because the DmN value of domestic bearings is only 2 times 106 mm r/min.

Now, domestic bearings have finally caught up with the international level.

"Although the life of the bearing has not been tested, I can be sure that the life of this bearing is at most six times the calculated life." Seeing a look of disappointment flashed across everyone's faces, Fang Zu changed his voice and said, "But this is not a bearing. It is not a question of technology, but a question of bearing materials. Once better bearing steel is replaced, top-level bearings with a calculation life of more than dozens of times can definitely be produced."

Having said that, Fang Zu paused.

Only then shouted loudly with a flushed face, "Now I declare that this is a top-level bearing, even if it is taken internationally, it is also the top-level bearing, no worse than the top-level bearings of any country."

After finishing speaking, Fang Zu's eyes were red.

This is a historic moment, enough to be remembered by all Chinese people.

For this goal, Chinese people have been catching up for decades.

Now it's finally here.

Clap clap!The applause sounded again.

A bright light flashed in Yang Xingjia's eyes, and he made a decision in his heart.

Li Yuanfang's eyes were full of disbelief, and he couldn't help but look at Tianze who looked indifferent.It was this young man who single-handedly transformed a second-rate bearing production line into first-rate bearing production, thereby producing top-notch bearings.

At this moment, Li Yuanfang was proud of his choice, and at the same time strengthened his determination to poach people from the public.

Since Tianze has created a miracle, why can't he create another miracle?
The workers are also excited.

Who wouldn't want to work for a promising company?
Even Qiu Xuejiao, who doesn't understand anything, is happy for Tianze.

"Tian Dong, we want all the bearings produced by your bearing factory." As soon as the applause stopped, Yang Xingjia couldn't wait to talk to Tianze.

"Mr. Li, don't worry about this matter. It's time to eat now. Why don't we find a restaurant first and chat while eating." Tianze's eyes lit up, and he didn't give Yang Xingjia an accurate answer, but changed the topic and said .

It has been personally tested by Jaycee Jaycee.

The bearings produced by the bearing factory are already at the top level in the world. Now Tianze doesn't have to worry about the bearings not being sold. Why is he so eager to agree to Yang Xingjia?

There is another reason.

That is, if all four factories are put into operation, the annual output value can definitely reach more than one billion.

And all of them are top-level bearings. Although the plate of Sinotruk is very large, it cannot be swallowed.

"All right!"

Yang Xingjia could only nod his head.

"Tianze, thank you! Thank you for producing the world's top bearings and winning glory for the country! I want to formally apologize for my impolite attitude just now." Fang Zu suddenly stopped in front of Tianze. After reacting, Fang Zu bowed deeply to Tian Ze, and said sincerely.

"Fang Lao, I can't bear it!" Tianze was shocked and said quickly.

At the same time, Tianze couldn't help feeling a surge of respect.

For Jaycee's character, but also for Jaycee's patriotism.

This is a respectable old man.

Same as the huge sea.

"Okay, let's go eat!" Obviously seeing Tianze's embarrassment, Yang Xingjia opened his mouth to make a relief.

"Yes, go eat!"

Tian Ze let out a sigh of relief.

(End of this chapter)