If you want to measure the workpiece, a vernier caliper is enough, this device can achieve an accuracy of 0.02 mm measurement data, and it is very simple to use, measuring diameter, inner diameter, length and depth can be used.

Song Weize took out the vernier caliper and measured it on the workpiece, although the workpiece was stuck on it, but a lot of data, such as the pitch of the screw, could already be measured.

"Hey, there will be errors in such measurements." Seeing that Song Weize couldn't wait to get started, Qin Zhenhua immediately shouted, this is still the director of the R&D room, why is it just a few moments?

Don't you know a basic principle of thermal expansion and cold contraction?

The process of processing is friction, tool cutting, in fact, it is also friction, so in the process of processing, the tool and the workpiece will be heated because of friction, now, just after the processing is completed, the workpiece has at least a few hundred degrees of high temperature, if the hand is in direct contact, it will be directly scalded and blistered.

Of course, Song Weize knew that the workpiece that had just been processed could not be used directly, so he only planned to use vernier calipers to measure a few sets of data first, and he would not touch the workpiece with his hands at all, but when Qin Zhenhua said this, it was like thunder and woke him up.

"When you are cutting, you have already taken into account the effect of thermal expansion and cold contraction?" Song Weize asked.

"Of course, if you don't take into account the friction effect of the tool, the manufactured workpiece, of course, the scrap rate will be greatly improved, after all, CNC machine tools are different from our ordinary machine tools, using it to process, it is originally to improve accuracy, you do not consider the effect of thermal expansion and contraction, the size is appropriate when processing, and after cooling, the size will shrink."

"That's right, that's why it was in the first place!" Song Weize suddenly realized, no wonder they used to be in the research and development of this kind of CNC machine tools, how to use it is not up to standard, moreover, the error is very strange, sometimes high, sometimes low, what comes out is waste, the result can only be given up.

Who would have thought that it was this factor that was at fault, if this factor was taken into account, the size of the processing was slightly reduced, as long as it was reduced by even 0.02 mm, and when it was cold, it would shrink back, and it would just meet the standard.

At that time, they repeatedly adjusted the accuracy of the turning tool and the accuracy of the machine tool fixture, but they didn't think about considering thermal expansion and cold contraction!

Song Weize's expression was seen by Qin Zhenhua in his eyes, and he was also full of emotion, the former workers and masters, mainly relied on words to help, and rarely had solid theoretical skills, and they did not despise the front-line production workers, but only when theory is linked to practice, only by being willing to use their brains and mastering scientific and cultural knowledge can they continuously improve their skills.

This is the person in charge of the technical department, and the result is also this level.

Of course, there are other reasons for this, the main personnel of the factory's research room come from front-line employees, and there are also a small number of college students assigned by superiors, who either lack theory or practice, and the real professional research institute specializing in research and development, there is still a big gap.

"Alright, it's pretty much it now." Qin Zhenhua said: "Measure." ”

The processing of the workpiece heats up quickly, and the temperature drops down so quickly that it can now be touched almost by hand. Qin Zhenhua generously removed the workpiece from the fixture and handed it to Song Weize.

Measure it!

Wait, what is Qin Zhenhua doing?

I saw Qin Zhenhua pick up the new raw material blank from the ground and clamp it on it again!

In the process of processing, there may be scraps, and in the case of sufficient time, once the processing error, you can start again, so there are three blanks on each person's station.

Qin Zhenhua picked up the second billet, and then, restarted the machine, and suddenly, the roar of the machine tool sounded again.

Hmph, bragging! At this time, Yu Changhong just raised his head, although it was a little far away, and he couldn't see it very clearly, but Qin Zhenhua's machine tool started again, what does this mean?

It must have been his first product that was scrapped, so he started tinkering with the second one!

This workpiece is difficult to process, so in addition to Qin Zhenhua, there are other masters who have started tinkering again.

And what about Yu Changhong?

He's already done the second processing and just needs the final finishing touches! His products are coming out soon!

Thinking of this, Yu Changhong worked harder, using a file to eliminate burrs, and even sanding with sandpaper, striving for perfection, not only to ensure that time is the first, but also to ensure that the quality is the first!

These days, he has nothing else to do, he has been exercising and processing this special workpiece every day, and he has long been proficient, and compared with those new hands, he is naturally superior.

Finally, the sandpaper was sanded clean, and the slightest flaw was gone, and he beckoned to the nearby invigilator: "I'm done, please time, seal!" ”

This kind of formal skills competition, after how many times of practice, there is already a complete set of program process, record time, sealing, numbering, so, the final evaluation of the best quality of processing, is not known which master, only the final evaluation is completed, will be on the number and name.

It was supposed to be a one-day assessment, but now, only two hours and five minutes have passed!

Yu Changhong stretched his waist, after this series of work, he was tired enough, now, he moved a little, looked at his processed products, which had been sealed, and walked towards the back with the envious eyes of the surrounding masters.

Qin Zhenhua's lathe is still spinning, it seems that he has failed several times, right?

What else do you say that you have to not only do it, but also use your brain, be a worker, don't do it, and wait for pie to fall from the sky?

Yu Changhong quickly organized the language in his mind, and before he could get to Qin Zhenhua, he roared: "Xiao Qin, how many times have you failed?" The results of your brains are all waste, right? If we are workers, we have to be down-to-earth, and you will not be ashamed to participate in the skills competition this time. ”

There are five blanks per person, and if all the processing is broken, there will naturally be no results.

Turning his head again, he saw that the place where the blanks were placed, all five blanks, were used up, and then he couldn't help laughing: "The last one, right?" I know you don't have this ability, you don't have hair on your mouth, you can do a fart. ”

Qin Zhenhua pointed in the other direction with his finger: "The farts are all there." ”

There, a few people were pouting there, I don't know what to do, Yu Changhong was in a good mood, he was already fluttering, and he slapped a person's ass in the past: "Hey, let Jean, I'll take a look at the waste products he processed." ”

This person raised his head and showed a majestic face, and Yu Changhong was stunned for a moment: "Director Zhou? ”