"Fang Lao, how are the test results?" Yang Xingjia couldn't help but ask. Pen "Fun" Pavilion www.biquge.info

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, but after all, he is not a science talent, so he does not know how awesome Tianze's transformation is. The workers also did not realize the difference between the bearings produced, and they have always been produced as ordinary bearings.

"Accuracy P2 level!"

Fang Zu said first.

The accuracy of the bearing includes dimensional accuracy and rotational accuracy, and the dimensional accuracy is the item required when the bearing is mounted on the shaft or bearing housing, and it includes the inner diameter, outer diameter, width, chamfer dimensional tolerance or allowable value. The geometric accuracy includes the allowable values of the inner diameter deviation, the average inner diameter difference, the outer diameter deviation, the average outer diameter difference, and the parallel difference of the ferrule end face. The rotation accuracy is to specify the oscillation during rotation, including the radial oscillation and axial oscillation of the inner ring and the outer ring, and the tolerance range of the verticality of the inner ring and the outer diameter surface.

The accuracy level increases from ordinary class 0 to level 6, class 5, class 4 and level 2.

P0 is the lowest, P2 is the highest, and generally the bearings above P5 will be customized.

Hearing Fang Zu say that the accuracy is P2, everyone is very excited.

But it can still be restrained.

Because there are many factories that can produce P2 bearings in China.

"2 sets of plays!"

Fang Zu continued.

The clearance of the bearing refers to the amount of movement of the ring when the bearing is fixed on one side of the inner ring or the outer ring when the bearing is not installed in the state before the shaft or bearing housing, so that the unfixed ring moves radially or axially. 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 properties of the bearing.

The radial clearance of rolling bearings is divided into five groups: 2 groups, 0 groups, 3 groups, 4 groups and 5 groups, and the clearance value is from small to large, of which 0 group is the standard clearance.

Hearing Fang Zu say that there are 2 groups of wandering, everyone has no reaction at all.

Because not all bearings require the smallest working clearance, you must choose the right clearance for the conditions. For example, 0 sets of clearance are suitable for general operating conditions, conventional temperatures, and commonly used interference fits; Bearings working under special conditions such as high temperature, high speed, low noise, and low friction should choose a large clearance group; For precision spindles, bearings for machine tool spindles, etc., it is advisable to choose a small clearance group.

"The vibration acceleration is much higher than Z3!"

"The vibration speed is over V3!" Fang Zu said two indicators in a row this time.

Instantly, a heavy breathing sound.

A round of applause followed.

Everyone, whether it was Yang Xingjia, Li Yuanfang, or the workers, everyone was clapping their hands vigorously, and their faces were full of excitement.

Why are you so excited?

It's all because these two indicators represent something so special.

Bearing vibration refers to the elastic deformation of bearing parts with time and all other movements that deviate from the theoretical position except for the movement necessary for the function of the bearing, which is divided into vibration acceleration (dB) and vibration velocity (μm/s). Vibration acceleration is divided into Z, Z1, Z2 and Z3 three levels of assessment, of which Z level is the basic level, Z1, Z2 and Z3 in turn indicate the bearing vibration level from low to high.

Similarly, the vibration speed is also divided into V, V1, V2 and V3 three levels of assessment, of which V is the basic level, V1, V2 and V3 in turn indicate the bearing vibration level from low to high.

And domestic bearings in these two aspects.

It's been weak.

Compared with Waguo bearings, the difference is at least more than 10dB, don't think that 10dB is not much, this is at least two grades of difference. In fact, our country is still using these two standards, and other countries have long abolished them, and it is enough to see the big gap with foreign countries.

"Bearing DmN value 4 times 106 mm r/min." Fang Zu's voice once again raised a lot.

Bang Bang Bang!

The applause that had just fallen rang out again.

Prolonged.

Bearing DmN value = bearing pitch diameter (mm) (that is, the average value of the inner diameter and outer diameter of the bearing) × rotation speed (rpm) is often used by bearing manufacturers as a measure of bearing speed, is the high-speed index of the spindle. 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 6 times the calculated life." Seeing a trace of disappointment flashing on everyone's faces, Fang Zu's voice changed, and he said, "But this is not a problem of bearing technology, but a problem of bearing materials. ”

Speaking of this, Fang Zu paused.

Only then did he shout loudly with a red face, "Now I declare that this is a top bearing, even if it is taken internationally, it is also the top bearing, no worse than the top bearing of any country." ”

After speaking, Fang Zu's eyes turned red.

This is a historic moment that can be remembered by all Chinese people.

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

Now it's finally happening.

Bang Bang Bang! Applause rang out again.

A gleam 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 had an indifferent face. It is this young man who single-handedly transformed a second-rate bearing production line into a first-class bearing production, thus producing top 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 already created miracles, why can't it create miracles again?

The workers were also excited.

Who wouldn't want to work in a promising company?

Even Qiu Xuejiao, who doesn't know anything, is happy for Tianze.

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

"Mr. Li, this matter is not in a hurry, now it's time to eat, why don't we find a restaurant first and chat while eating." Tian Ze's eyes lit up, and he did not give Yang Xingjia an accurate answer, but diverted the topic.

It has been personally tested by Fang Zu.

The bearings produced by the bearing factory are already the top level in the world, and now Tianze is not worried that the bearings cannot be sold, why should he be in a hurry to promise Yang Xingjia?

There is one more reason.

That is, if the 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, and although Sinotruk's plate is large, it can't swallow it.

"Okay!"

Yang Xingjia could only nod.

"Tianze, thank you! Thank you for producing the world's top bearings and winning glory for the country! I would like you to formally apologize for your rude attitude just now. Fang Zu suddenly stopped in front of Tian Ze, and before Tian Ze could react, Fang Zu bowed deeply at Tian Ze and said sincerely.

"Fang Lao, I can't stand it!" Tianze was taken aback and hurriedly said.

At the same time, Tian Ze couldn't help but feel a sense of respect in his heart.

For the morality of Fang Zu, but also for Fang Zu's patriotism.

This is an old man worthy of respect.

Same as the huge sea.

"Alright, let's go eat!" Obviously, seeing Tianze's embarrassment, Yang Xingjia opened his mouth to relieve the siege.

"yes, let's eat!"

Tian Ze breathed a sigh of relief.