Dial gauges, a common measuring tool used in the machining industry, are as common as calipers and micrometers. The dial gauge, as the name suggests, is to divide a millimeter into 100 equal parts on the dial, and every small square of the watch's hand beats is a hundredth of a millimeter, that is, a thread.

Gently knock the parts with a small wooden chase, the parts are gradually and completely aligned, the beating of the dial indicator is almost invisible to the naked eye, if you don't look carefully, you really can't see this slight beating, indicating that the beating must be within a trace, may still be within five thousandths.

"The outer datum of this part is well machined, very round, and the runout does not exceed 5 thousandths." Tang Jianyì appreciated it, and there was a little admiration in his tone.

It is not easy to process the outer circle of more than 300 millimeters so round, Tang Jian is an expert in machining, and he knows the difficulty of this process, so he will say so.

Li Tianfeng nodded, "Expert Tang, the part datum has been completely corrected, let's measure the beating of the inner circle of the part." ”

"I'll come in person." After speaking, Tang Jianyì still personally operated, using another dial gauge to contact the inner circle of the part with the gauge head, or pressing the gauge for more than a dozen wires.

"Pressure gauge" is an industry term, how big the gauge is very particular, too big is not good, it affects the sensitivity of the dial gauge, too small is not good, it may not be accurate to measure, it is best to press the gauge more than a dozen wires, obviously, Tang Jian yì is experienced, the pressure gauge is more than a dozen wires.

After pressing the table, Tang Jianyì began to gently rotate the precision turntable, turning gently, and at the same time, his eyes carefully looked at the two dial gauges.

Everyone's eyes are similar, and they are also staring at these two dial gauges carefully, and the answer is about to come out.

Gently turning the precision turntable, the dial gauge pointer barely reacted, at most it shook slightly, while turning the turntable, the stunned look on Tang Jian's face became more and more obvious, and after a circle, Tang Jianyi said in disbelief: "Impossible!! ”

"It can't be! Hell, I'm going to measure it again. Tang Jian muttered.

Seeing this qiē and seeing the excellent quality of the parts, Liu Qingshan felt very good, and said with a smile: "Expert Tang, this qiē is measured by you personally, and the two dial gauges are installed by you personally, there will be no mistake!" ”

Hearing this, Tang Jian suddenly patted his head lightly, and then said, "Really, I personally checked and installed these two watches, and there will be no mistakes." ”

After speaking, he turned back to Li Tianfeng with emotion and said: "Mr. Li, I was a little impatient just now, I was almost confused, as far as this process is concerned, the quality of parts processing is good, very good." ”

As soon as the words changed, Tang Jianyi still said: "However, I don't approve of the processing route of your flame tube, I have reservations, this process is well processed, and there is finishing to be carried out in the follow-up, in case the parts are deformed in the follow-up process, then there is no room for recovery." ”

Now, the inner circle of the flame cylinder has been processed to the design size, and there is no margin for rework, so Tang Jian Yì said.

According to the original processing route of factory E, after the inner circle of the fine turning flame cylinder, there will be a machining allowance of 1 mm, which is not processed to the design size at one time, and after leaving the machining allowance of 1 mm, the outer circle of the finishing car, after the finishing turning, also leaving the machining allowance of 1 mm, and then the inner circle of the fine turning, and then the outer circle of the fine turning, and repeatedly, until the final design size.

In this way, even if the deformation occurs, the size that has been processed in place has changed slightly, and there is a margin to correct again, the disadvantage is that the deformation has not been avoided, and finally it will affect the final design size, affect the qualification rate and processing quality of the part.

However, the processing route of Tianfeng Technology is completely different from that of E factory, and the processing route of Tianfeng Technology is to take advantage of the fact that the wall thickness of the parts is still relatively thick and the rigidity is very good, and the inner circle is processed to the final design size at one time, and then the outer circle is processed.

At this time, the wall thickness of the parts is still very thick, several millimeters of processing thickness, which means that there is a large cutting allowance, such a large number of parts and materials cutting, the parts will be thinner and thinner the more they are processed, and the corresponding rigidity will be worse and worse.

If it weren't for the excellent quality of the internal processing of the parts just now, Tang Jianyi might have walked away, where would he have such a good face, and politely said that he had reservations.

Tang Jianyì had reservations, and Li Tianfeng didn't argue, and said lightly: "Then let's carry out the next finishing process, and then take a look at the processing quality of the parts, and let the facts speak." ”

Liu Qingshan naturally looked at the follow-up processing route carefully just now, and said worriedly: "Tianfeng, next processing, I'm afraid the parts will be deformed!" ”

Li Tianfeng smiled and said, "Mr. Liu, don't worry, we have a way to control the deformation of the parts." ”

Can control the deformation of parts!

Liu Qingshan glanced at Li Tianfeng in surprise, obviously looking forward to it, and wanted to see how Tianfeng Technology controlled the processing and deformation of parts.

Li Tianfeng knew that everyone was looking forward to it, and he was not ambiguous, so he waved his hand and said, "Director Zhang, hurry up and arrange the next process." ”

The next process is the finishing outer circle, and now the machining allowance left is still relatively large, several millimeters, and the flame cylinder is relatively thick, very strong, and the rigidity is very good.

Zhang Can was also very neat, knowing that everyone was watching the results, he immediately ordered the workers to come over and move this part to another German CNC lathe not far away.

Because of the obstruction of vision, no one saw this CNC lathe, Cheng Gang admired and said: "Good guy, it's another German precision number car." ”

Chen Dong also understood a little, and nodded and said: "Yes, surprise one after another, this German precision number car is at least a few million bigger!" ”

Li Tianfeng thought in his heart, no, seven or eight million, however, there are several such CNC equipment in the No. 1 workshop, and there are more expensive machining centers, CNC grinders, etc., such equipment is very rare in the eyes of others, and in Li Tianfeng's opinion, it is average.

The operator of this CNC lathe is also a more experienced master, the master's surname is Zhou, thirty or forty years old, he seems to be very energetic, and has long been prepared, has been on standby.

As soon as the parts were transported, Master Zhou immediately skillfully installed the parts on the fixture, and the action was relatively fast, and in one or twenty minutes, the parts were properly installed on the clamp of several cars.

This fixture for installing parts is obviously a specially designed special fixture, and everyone sees this fixture and their eyes light up.

Liu Qingshan even said: "Tianfeng, this is a special number of car clamps specially designed and manufactured by you, which looks good and is quite special." ”

The clip has some special designs, and even Liu Qingshan didn't understand it for the time being, and Tang Jian yì didn't understand it for the time being.

However, Tang Jianyì still said: "Mr. Li, the fixture looks very good, but I still haven't seen it, how do you control the processing deformation of the parts in this process, is it relying on this special fixture, I don't think it's like it." ”

Everyone was waiting for Li Tianfeng to answer, and Zhang Can's big voice sounded outside, "It's coming, it's coming, let's let go, it's hot." ”

Everyone followed the prestige, only to see Zhang Can personally with two workers, each of whom was carrying an iron bucket in his hand, and the bucket was obviously filled with a lot of things, which seemed relatively hot.

Everyone got out of the way, and when the two workers came in, everyone looked into the iron drums, only to see that inside each iron drum was half a barrel of paraffin that had melted.

It seems to be paraffin!

Seeing this thing, Tang Jian was stunned, and then shook his head gently, "Mr. Li, do you want to fill the inner cavity of the part with paraffin, and after the paraffin wax cools, fill it in the inner cavity of the part, so as to enhance the rigidity of the part, so as to control the processing deformation of the part?" ”

Li Tianfeng nodded, basically like this, but there are some differences, and I can't tell it clearly for a while.

Seeing Li Tianfeng nodded, Tang Jianyi smiled bitterly and said: "Mr. Li, I'm afraid you are going to plant it this time, we tried this method when we were processing the flame cylinder, and the effect was very poor." ”

Tang Jianyì said the truth, even Liu Qingshan, Cheng Gang and others next to him nodded, and the scene of processing the flame cylinder immediately appeared in everyone's minds.

At the beginning of the trial production of the flame cylinder of the turboshaft C engine, Plant E basically adopted a processing technology similar to the one just now, that is, after the internal circle of the part was processed to the final design size, it was filled with paraffin wax, and the outer surface was processed after the paraffin wax was completely cooled.

The purpose of this is naturally to borrow paraffin wax to enhance the rigidity of the parts, just imagine, after the paraffin wax filled inside is cooled and hardened, it is hard and filled, and the originally thin parts appear to be rigid, but this is not the case.

Because we all know that thermal expansion and cold contraction, after the paraffin wax cools, it will shrink, and a large gap will be formed between the parts, at least two or three millimeters of gap, so that the paraffin wax will fail, and the outer circle of the parts will still be deformed.

At the beginning, the E factory used this kind of processing, scrapped several parts in a row, and after learning these lessons, it adopted the current new process, that is, no longer pouring paraffin, using over and over again, little by little, layer by layer, turning the inner circle and outer circle of the parts repeatedly.

However, the new process of factory E does not seem to work well, the processing quality of parts has been unstable, and the pass rate has been almost zero, which is helpless, otherwise, such a critical and important part of the vortex C will not be processed in Tianfeng Technology.

Seeing that everyone had a negative attitude, Tang Jianyì shook his head from time to time, completely not optimistic about his process plan, Li Tianfeng couldn't help but say: "Don't worry, just keep looking." ”

Liu Qingshan also seemed to be completely open, and comforted: "Try it and then say, anyway, in the processing of this flame tube, we have scrapped a lot of parts, if it is scrapped again this time, we will treat it as having paid a tuition, and I will sign the order if the parts are scrapped." ”

At this time, Liu Qingshan also showed a little atmosphere, Li Tianfeng quietly glanced at Liu Qingshan, and nodded secretly.

……

It will be on the shelves at noon tomorrow, I am really looking forward to it, I am excited!

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