Military Heavy

Chapter 199 Found the Root of the Problem

Yang Fan looked puzzled.

Noticing Yang Fan's expression, Chen Shaohua's heart sank slightly, and he couldn't help asking, "What's the matter, is there a problem?"

Yang Fan didn't speak, and seemed to be in deep thought.

A technician next to him said: "We have measured the shafting deviation in three temperature environments, and there is almost no change. We speculate that the shafting deviation is hardly affected by temperature changes, or the change is very small, which is far more than Director Yang speculated. much smaller."

what!
Virtually unaffected by temperature changes? ? ?
Chen Shaohua's heart sank again, and he even thought in his heart, could Yang Fan's deduction also be wrong, no, no.
He kept comforting himself in his heart, thinking that Yang Fan's deduction would not be wrong.

Zheng Xianxue also thought that there would be no mistakes, and scolded the technician just now: "Don't talk nonsense, how could Director Yang make mistakes."

Yang Fan smiled, and said without hesitation: "I'm not a god, and I may make mistakes, but my deduction this time should not be wrong."

After finishing speaking, he continued: "Now it is 29 degrees, measure it again, no, measure the shafting offset value three times at the same temperature."

This is mainly to reduce the measurement error.

The value of the shafting offset is extremely small, and the technological requirement is that the offset value is within 0.05 mm. Yang Fan saw that the values ​​measured by several technicians in three temperature environments were either 0.039 mm or 0.040 mm, which is only one thousandth. one of the differences.

Such a small difference can be considered as measurement error, not necessarily caused by temperature. In order to measure more accurately and reduce measurement error, it is necessary to measure several times.

Zheng Xianxue immediately waved his hand and ordered: "Quickly measure according to what Director Yang said, and measure at least three times in each temperature environment."

These quality and technical personnel acted again to measure the shafting offset of the power system, and the results came out in a short time.

A technician looked surprised, "Sure enough, there is a measurement error. The value we measured just now is 0.040 mm, but this time it is 0.041 mm."

Continue to measure, and measure twice, one time is 0.040, and another time is 0.041, a total of three measurements have two times are 0.041 mm.

Continue to measure again, it is still 0.041 mm.

Zheng Xianxue judged: "Under the temperature environment of 29 degrees, the shafting offset is 0.041 millimeters instead of 0.040 millimeters, indicating that from 31 degrees to 29 degrees, the shafting offset has changed by two thousandths."

Yang Fan also thought so, and nodded in agreement.

Hearing this, Chen Shaohua was slightly relieved, his originally serious expression suddenly became much more relaxed.

Will the temperature change really affect the shafting offset? Yang Fan, Chen Shaohua and Zheng Xianxue didn't leave the power cabin, they just stayed here and waited.

After about half an hour, the temperature dropped to 28 degrees.

At this temperature, it was measured three times, and the measured values ​​were all 0.043 mm, and the shafting offset was two thousandths larger than that in the temperature environment of 29 degrees.

Yang Fan became more and more sure that the temperature would really affect the offset of the shafting, and the effect was relatively large. The failure of two consecutive test runs was probably really affected by temperature changes.

The originally adjusted shafting deviation is qualified at a certain temperature, but as the temperature changes, the originally qualified shafting deviation value exceeds the qualified range, and the originally qualified value becomes unqualified.

Yang Fan, Chen Shaohua, and Zheng Xianxue didn't go back until midnight.

The temperature in the power cabin has also dropped to 25 degrees, and the measured shafting offset has reached 0.061 mm, which is completely beyond the acceptable range.

The monitoring is still going on, but there is no need for Yang Fan and others to stay here. The technical quality personnel are in charge. They measure the shafting offset value three times in each temperature environment and record it.

This kind of monitoring, Yang Fan thinks that it takes at least 24 hours, and it can monitor two rounds, that is, 48 ​​hours is the best.

Zheng Xianxue suggested simply monitoring the shafting offset value under each temperature change within 48 hours, and Chen Shaohua agreed.

So, it was settled.

There is no need for Yang Fan to worry about the future monitoring, just wait and see the results, and go back to the guest house of Donghaisuo, and sleep at the end, sleeping very soundly and peacefully.

He didn't get up until ten o'clock in the morning the next day, and had breakfast at the hostel. Yang Fan went to the power cabin and checked the monitoring results.

Sure enough, the temperature change has a great influence on the shafting offset. The maximum offset value has reached 0.065 mm. As the temperature rises, it will reach 38 degrees, or even 40 degrees. Will there be a larger offset value? Hard to say.

After watching it for a while, Yang Fan temporarily returned to Donghai Institute.

As soon as I got to work in the afternoon, less than 10 minutes after I sat down in the office, Chief Master Pan called and called Yang Fan over.

As soon as Yang Fan entered, Chief Master Pan asked, "Xiao Yang, I heard that you stayed at Donghai Shipyard for one night and you just came back?"

"Yes." Yang Fan nodded, "We have found the reason for the failure of the two test runs, mainly because the shafting offset is greatly affected by temperature changes."

Briefly introduce the situation.

Immediately, Master Pan became happy and relieved!

"Great!" Chief Master Pan's face showed obvious joy, showing the joy in his heart, and said loudly: "The root cause of the problem has been found, and this problem can finally be solved!"

When he was happy, he praised: "Xiao Yang, you are really good. You have made another contribution and solved this big problem. I think even Commander Huang will be happy."

Ah!
Yang Fan was slightly surprised. He didn't expect that Commander Huang Keping was paying close attention to this matter. Then he realized that it was normal for Huang Keping to pay attention. After all, this is not a small problem.

The root cause of the problem has been found, what should I do next?
Yang Fan said his plan, after 48 hours of monitoring, there will be another 24 hours or 48 hours of shaft offset adjustment.

In the next 24 hours or 48 hours, if the measured shafting deviation is unqualified, adjust it in this temperature environment.

If it is unqualified in any temperature environment, it should be adjusted in that temperature environment to ensure that the offset value of the shafting in any temperature environment is qualified, all within the range of 0.05mm.

Hearing Yang Fan's plan, Pan Jinfu nodded in agreement, "Yes, this method is good, simple and effective. I believe it can solve the problem of shafting offset, and it should be able to ensure the success of the third test run."

In this regard, he is confident!
He has more confidence in Yang Fan!

Donghai Shipyard.

According to the method Yang Fan said, the 48-hour shafting offset value monitoring has been completed, and the temperature in the power cabin varies from 24 degrees to 41 degrees.

Each temperature environment has at least three measurements, and some temperature environments even have four or five measurements.

The shafting offset value also varies greatly from qualified to unqualified, and the largest shafting offset value reaches 0.072, which is a serious unqualified.

conference room.

Chen Shaohua, Xie Xinjian, and Zheng Xianxue were all sitting there, in addition to some backbone and senior technicians of Donghai Shipyard, as well as some production managers.

Yang Fan, Li Zhengjun, and several other technicians from Donghai Institute are also sitting here to participate in this meeting.

Zheng Xianxue introduced the monitoring situation within these 48 hours to everyone, and each sent a form, which recorded the shafting offset value under each temperature environment.

His voice was loud and relaxed, "Comrades, thanks to Director Yang Fan, we have found the reason for the failure of two consecutive test runs. Now we can be sure that it is the change of the shafting offset value caused by the temperature change. "

"The next thing we need to do is to troubleshoot and solve the problem of the influence of temperature on the shafting offset value. In this regard, Director Yang is an expert. Now let him tell us what we should do next."

brush!
Almost all eyes were on Yang Fan. At this moment, Yang Fan became the focus of the entire conference room.

These eyes have appreciation, joy, and admiration!

so amazing!

There really are two brushes!
As expected of Director Yang!

Director Yang helped us find the root of the problem again!

Many technicians think this way in their hearts, even those old technicians in their 50s and [-]s who have worked in technical work for almost a lifetime, they also admire Yang Fan very much.

The conference room fell silent.

In the eyes of everyone, Yang Fan stood up and said in a clear voice: "Next, I think we should do this. We will use another 48 hours to measure the offset value of the shaft system in each temperature environment. If it is found to be unqualified Just make adjustments to ensure that the shafting offset is within the acceptable range of 0.05mm"

Everyone listened carefully.

After listening, there was applause in the conference room, which was an affirmation of Yang Fan's speech, and everyone agreed that this method is feasible.

Simple yet effective!

Chen Shaohua personally made the decision, "Then we will follow Director Yang Fan's method."

So, things settled down.

Zheng Xianxue carried out personnel arrangement and division of labor according to the method proposed by Yang Fan, and immediately took action after the meeting was adjourned.

In the power cabin, technical and quality personnel have been monitoring the offset value of the shafting and making appropriate adjustments to ensure that the offset of the shafting is qualified under any temperature environment.

Two days later.

Yang Fan came to Donghai Shipyard again, and it was Chen Shaohua who came to Donghai Shipyard politely and warmly invited Yang Fan over.

"Director Yang, we have carefully adjusted the shafting of the power system. It is qualified under any temperature environment, and the offset value does not exceed 0.05 millimeters."

After finishing speaking, he also handed a monitoring report to Yang Fan.

After receiving the report and flipping through it, Yang Fan said happily: "The data are all qualified, I think the third test run can be carried out."

The third test run was exactly what Chen Shaohua hoped for.

The third test run seemed to be a matter of course, and it seemed to be such a pleasant surprise!

Chen Shaohua looked at Yang Fan, and it took two or three seconds before he realized it, and then said loudly: "It is really possible to carry out the third test run!"

Three more updates will continue today, and the first update will be delivered!

(End of this chapter)