If you want to measure the workpiece, a vernier caliper is enough. This device can measure data with an accuracy of 0.02 mm, and it is very simple to use. It can be used to measure diameter, inner diameter, length and depth.
Song Weize took out the vernier caliper and started measuring the workpiece. Although the workpiece was stuck on it, a lot of data, such as the pitch of the screw, could already be measured.
"Hey, there will be errors in this kind of measurement." Seeing that Song Weize was eager to get started, Qin Zhenhua immediately shouted, "This is the director of the R&D room, why is it just like this?"
Don’t you know the basic principle of thermal expansion and contraction?
The process of machining is friction, and tool cutting is actually friction. Therefore, during the machining process, the tool and the workpiece will generate heat due to friction. Now, just after processing, the workpiece has a high temperature of at least several hundred degrees. If it is directly touched by hands,
, it immediately blistered.
Of course Song Weize knew that the workpiece that had just been processed could not be handled directly, so he only planned to use a vernier caliper to measure a few sets of data without touching the workpiece with his hands. However, when Qin Zhenhua said this, it was like thunder.
He was woken up.
"Have you considered the effects of thermal expansion and contraction when cutting?" Song Weize asked.
"Of course, if the friction effect of the tool is not taken into account, the scrap rate of the manufactured workpieces will of course be greatly increased. After all, CNC machine tools are different from our ordinary machine tools. The purpose of using them for processing is to improve accuracy.
Yes, if you don’t consider the effect of thermal expansion and contraction, then the size will be appropriate during processing, but after cooling, the size will shrink."
"Yes, that was the reason in the beginning!" Song Weize suddenly realized that no wonder when they were developing this kind of CNC machine tool, it failed to meet the standards no matter how they were used. Moreover, the error was very strange. Sometimes it was high, and sometimes it was low.
It is a waste product, and the only result is to give up.
Who would have thought that it turned out to be this factor. If we had taken this factor into consideration and slightly reduced the processing size, even by 0.02 mm, and when it cooled down and shrunk back, it would have just met the standard.
At that time, they repeatedly adjusted the accuracy of turning tools and the accuracy of machine tool fixtures, but they never thought of considering thermal expansion and contraction!
Song Weize's expression was seen by Qin Zhenhua, and he was filled with emotion. In the past, the worker masters mainly relied on words and guidance, and few had solid theoretical basic skills. He did not despise the front-line production workers, but he only
Combining theory with practice, only by being willing to use your brain and master scientific and cultural knowledge can you continuously improve your skills.
This is the person in charge of the technical department, and the results are of this level.
Of course, there are other reasons for this. The main staff of the factory's research laboratory come from front-line employees, and there are also a few college students assigned by superiors. They either lack theory or practice, and a real professional research institute specializes in research and development.
The workpiece heats up quickly and cools down quickly during processing. Now it can almost be touched 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!
During processing, there may be scraps, and if there is enough time, once the processing is wrong, you can start again. Therefore, each person has three blanks at his workstation.
Qin Zhenhua picked up the second blank, and then started the machine again. Suddenly, the roar of the machine tool sounded again.
Humph, bragging! At this time, Yu Changhong just raised his head. Although he was a little far away and couldn't see clearly, Qin Zhenhua's machine tool started running again. What does this mean?
His first product must have been a waste, so he started tinkering with the second one!
This workpiece was difficult to process, so in addition to Qin Zhenhua, other master craftsmen started tinkering again.
And what about Yu Changhong?
He has completed the second processing and only needs final finishing! His product will be out soon!
Thinking of this, Yu Changhong worked even harder, using files to remove burrs, and even polishing with sandpaper, striving for perfection, not only to ensure first place in time, but also to ensure first place in quality!
These days, he does nothing else but practice processing this kind of special workpiece every day. He has long been proficient in it. Compared with those novices, he is naturally able to judge the difference.
Finally, after the sandpaper was polished cleanly and there were no flaws at all, he called to the nearby invigilator: "I'm done, please time it and seal it!"
This kind of formal skills competition, after many times of practice, already has a complete set of planning procedures, recording time, sealing, and numbering. Therefore, when it comes to the final evaluation of the quality of the processed products, I don’t know which master is
Yes, only after the final evaluation is completed, the number and name will be determined.
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 very tired. Now, he moved a bit and looked at his processed products, which had been sealed up, facing the old masters around him.
They walked towards the back with envious eyes.
Qin Zhenhua's lathe is still spinning. It seems that he has failed several times, right?
Also, you have to not only use your hands, but also your brains. To be a worker, if you don’t do it, you are still waiting for pie to fall from the sky?
Yu Changhong organized the words quickly in his mind, and before he reached Qin Zhenhua, he shouted: "Xiao Qin, how many times have you failed? The results of your brainstorming are all waste products, right? We are workers.
, you have to be down-to-earth. If you come to participate in the skills competition this time, there will be no shame in being the last one."
Each person has five blanks. If they are all damaged during processing, there will naturally be no results.
Then he turned around and saw that where the blanks were placed, all five blanks were used up. Then he couldn't help laughing loudly: "Is this the last one? I know you don't have this ability. You don't even have hair on your mouth. You can do shit."
ah."
Qin Zhenhua pointed in another direction with his finger: "Where are all the farts?"
There, several people were poking their butts out, not knowing what they were doing. Yu Changhong was in a good mood and was already in high spirits. He went over and patted someone on the butt: "Hey, let me take a look at the waste products he processed."
The man raised his head and showed a majestic face. Yu Changhong was stunned: "Director Zhou?"