Li Tianfeng and Ouyang Feifei came to the side of this precision five-coordinate CNC machining center, Li Tianfeng first looked at the position measurement list, and then looked at the tool situation, the fixture situation, a qiē is better, and then, Li Tianfeng said: "Ouyang Feifei, let's check the flatness of the fixture support surface." ”

After speaking, Li Tianfeng personally picked up the dial gauge, personally checked the fixture, and after looking at the beating of the dial gauge, Li Tianfeng said: "Ouyang Feifei, the support surface of the fixture is uneven, you see that there is almost a trace of the beating, and the fixture should be repaired to ensure that the beating of the support surface is within five thousandths, and the smaller the better." ”

"Li Gong, then I'll remove the fixture and send it for repair immediately." Ouyang Feifei said.

Li Tianfeng nodded and said, "I'll take a look at the processing procedure again." After speaking, Li Tianfeng looked at the processing program on the machine tool and simulated it.

"Ouyang Feifei, stop processing for the time being, I want to optimize this program." Li Tianfeng said. After looking at the program a little just now, Li Tianfeng thought in his heart, "Who compiled this processing program, the level is so low." ”

In fact, this program is okay, but Li Tianfeng's current level, such a program naturally does not enter Li Tianfeng's eyes, and naturally has to be greatly improved, in addition, Li Tianfeng also saw that the key to unqualified parts processing lies in this CNC program.

After instructing Ouyang Feifei a few words, Li Tianfeng hurriedly returned to the process technology room, sat in front of his computer, and began to compile his new program.

The original program was old and long, and it was printed out for more than a dozen pages, but after Li Tianfeng's improvement, this new program was much more concise and advanced, with only five or six pages.

Li Tianfeng printed out the program and signed his name, and then opened a program change order and signed his name.

Even if Li Tianfeng is a technician, but this CNC machining program is not said to be changed, as a military enterprise, E factory has strict technical management, like just now, when you need to change the program, you must fill out the program change application form, you need to find proofreading and review signature.

The program change order was signed relatively smoothly, and it didn't take long for the new program to be sent, and the new processing program was sent to Ouyang Feifei's CNC machining center, and Li Tianfeng personally stood by the side for processing.

Factory E also stipulates that the technician has to track the first processing of the new program, which is called "following the first piece", that is, guarding the processing by the side.

"Li Gong, this program has changed a lot, the tool has also changed a lot, the amount of cutter feed, and the speed have increased a lot." Ouyang Feifei said in surprise while installing the tools on the machine tool.

This processing program is compiled by Li Tianfeng, which is naturally different from the previous program, the speed has really increased a lot, and the speed has increased so much, Li Tianfeng is not worried that something will happen at all.

Li Tianfeng has already seen that the previous processing program was very conservative and very lengthy, and it did not give full play to the maximum efficiency of the tool and machine tool. Li Tianfeng knows that the tool has a wear speed, that is, as long as it does not exceed this speed, the wear of the tool is relatively slow, and the tool will wear out sharply if it exceeds this speed.

Take the alloy drill bit for processing these 16 holes, such an alloy drill bit can reach more than 2,500 revolutions under the condition of 0.1 feed per circle, and the drill bit will not wear out quickly, Li Tianfeng compiled this new program, the speed of the alloy drill bit is 2,200 revolutions per minute.

Li Tianfeng has a wealth of knowledge in his mind, and naturally knows what kind of drill bit is best to use, and he also knows what kind of processing parameters are most suitable.

Ouyang Feifei's speed of loading the knife was not slow, and it didn't take long for her to start processing as soon as she was ready.

According to the old CNC machining program, the first thing will be to punch the center hole, then rough machining with a small alloy drill, and then finish with a coarse drill bit, and then fine boring, it takes more than an hour for a part to be processed, and Ouyang Feifei will process about four parts in eight hours in a shift.

"Li Gong, I'm starting to process."

Li Tianfeng nodded and said, "It's ready to be processed." ”

So, Ouyang Feifei pressed the start button, the processing program started, and the milky white coolant in the CNC machining center sprayed out, and then the spindle of the machine tool moved quickly, hissed, accurate positioning, and the alloy drill bit rotated at high speed, and drilled down the lì.

Iron filings were flying, water splashed everywhere, the glass door of the processing center could be seen clearly, and the slight beeping sound of steady dìng came out, and Li Tianfeng knew that the processing was normal.

The short alloy drill bit drilled down quickly, and then came out in just a few seconds, the machine tool spindle moved one position, and then drilled down at the position of the second hole, and the speed was very fast.

"Li Gong, what a speed!" Ouyang Feifei was surprised, it was a complete pleasure to watch such a fast and smooth processing.

It is not the first time to process this part, it used to take about two minutes to rough a hole, and it takes thirty or forty minutes to rough all 16 holes, plus finishing, a part is processed for more than an hour.

Li Tianfeng also nodded, this speed is indeed fast. In just two or three minutes, a total of 16 holes are all roughed out, the machine tool automatically changes, and the alloy boring cutter is replaced to start boring, and the speed is naturally fast, less than five minutes, 16 holes are all bored.

The tool is retracted, the machine spindle rises, the safety door opens, and the whole machining is completed.

"Li Gong, this is a new program you have compiled, it is too fast, it has improved nearly ten times compared to before, it is too unbelievable." Ouyang Feifei looked surprised.

Li Tianfeng was also very happy, he didn't think that he would try it out, Ouyang Feifei was so happy. Such a CNC machining program is indeed a bit against the sky for ordinary people.

"Quick, take a measurement."

Hearing this, Ouyang Feifei skillfully picked up the inner diameter dial gauge and measured the aperture of each hole, with a strong joy in the surprise, and said happily: "Li Gong, the aperture is all in the middle!" ”

The so-called "middle difference" is the middle position of the processed size close to the size tolerance of the drawing, such as the 16 precision holes of the tenth-stage roulette of the compressor just processed, and the hole size requirement is Φ10±0.025, and the 16 holes just processed by this new program are all within Φ10±0.01.

A part, can be processed in the poor, that is definitely an excellent product, such a result, Li Tianfeng is also very satisfied, personally looked at the surface roughness of the 16 holes, the inner wall of the hole is very smooth, the roughness is also very good.

"Take it and measure the position of the hole."

If the position degree is qualified, then this part is an excellent product, and if it can be processed at such a fast speed, then the new CNC machining program just now is very good.

The measurement results naturally came out quickly, the position degree of the 16 holes was 0.01 (that is, one wire), the drawing requirements were two wires, and the position degree was also medium difference.

"Li Gong, you are so powerful, there is such a CNC machining program, this batch of parts will be processed before I get off work, if it was before, don't think about it for two or three days." Ouyang Feifei was very happy.

Li Tianfeng was also happy, and there was a slight sense of accomplishment in his heart.

"What's the matter, you two are so happy." A female voice sounded, Li Tianfeng and the two hurriedly turned around, only to see a woman in her thirties standing not far from him.

With slightly dark skin, a thick skeleton, and a relatively tall figure, Li Tianfeng immediately recognized that this was one of his top bosses, Chen Xiangchun, the technical deputy director of the precision machining center.

"Hello, Director Chen." Li Tianfeng hurriedly greeted him.

"Tell me, what's going on?" Chen Xiangchun originally had a tense face, but a faint smile actually appeared at this time.

Ouyang Feifei was very happy, and without waiting for Li Tianfeng to speak, Ouyang Feifei immediately said: "Director Chen, you want to praise Li Gong, the new program prepared by Li Gong is too good, and the CNC process of the tenth-level turbine disc was processed in less than ten minutes using Li Gong's new program." ”

"Oh, there's such a thing." Chen Xiangchun immediately took two steps forward, looked at the process processing card, and took out the CNC program card and looked at it quickly.

It also happens that the previous CNC machining program of this process was proofread by Chen Xiangchun, and now look at Li Tianfeng's new program, and make a judgment from top to bottom, which is better and which is worse is very clear.

After a quick look at this new program, Chen Xiangchun immediately said: "I will process another one more immediately, and I will take a look at it myself." ”

Seeing that Chen Xiangchun was a little excited and a little impatient, Ouyang Feifei reminded in a low voice: "Director Chen, you haven't done the first inspection yet." ”

Hearing this, Chen Xiangchun gently patted his head and said, "Look at me, I almost forgot about this matter, hurry up and take the first inspection." ”

The so-called "first inspection" is when each processing process, the first part of each batch to be inspected, after the operator self-inspection, the on-site inspector should carefully check again, to determine that the parts are processed correctly, the inspector should be stamped in the corresponding column of the processing process card, which is to play the "first inspection".

"First inspection" is a necessary procedure, which can effectively prevent the occurrence of quality accidents, especially to effectively prevent batches of out-of-tolerance and batches of scrapping.

Ouyang Feifei's first part was processed using the old program, unqualified, "first inspection" is naturally processed with the new program of this part, the on-site inspector soon came over, saw Chen Xiangchun, the technical director standing next to him, the inspector comrade was also slightly surprised, after careful inspection, and again and again amazed.

"It's in such good condition that almost all the sizes are in the middle of the range." After some exclamation, the inspector comrade immediately stamped it briskly, and after the first inspection, the second part began to be processed immediately.

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