Chapter 208 (1/2)
”Don't throw the shaft. Interference fit is required for assembly. If the shaft is thrown small, it will become clearance fit. Where can the accuracy of the main shaft be guaranteed?” Yun Fei was very relieved to see that he personally took several level-9 fitters in the factory to assemble the lathe that would be finalized without accident. However, when he saw Zhao bingbiao and goodrian assembling the bearing on the spindle, he planned to throw a thread or two of the bearing position on the spindle with sandpaper because he didn't dare to knock on the bearing or spindle.
The assembly of the main shaft and the bearing is mostly clearance fit. Generally, there is a gap of more than one wire and two wires. However, in some precision occasions, transition fit is often used, that is, the bearing hole is one to two wires smaller than the bearing position on the shaft.
The bearings of CNC machine tools were originally transitional fit. Soviet experts believe that the assembly relationship between the interference fit spindle and the bearing can better ensure that the runout of the lathe spindle during high-speed rotation is within the design scope of the machine tool.
”What's the matter with you? Don't knock with a hammer, Lao Gu. What's the copper bar on the workbench next to you for? You can't knock the spindle out of shape with a hammer? ” Yun Fei, like a menopausal woman, kept reminding the fitters who carefully assembled the lathe.
From the first test lathe only equipped with ball screw, high-precision gear disc, rotary tool holder and CNC system on the ordinary lathe to the current lathe about to be finalized, the number of CNC lathes installed by these people in a few months is more than two digits, which is much older than the experience of Yun Fei, who just looks at the boss.
Everyone can understand Yunfei's mood.
The market is now full of a large number of various types of garbage lathes (as Yunfei, the boss who is used to imported machine tools, said). Domestic customers with demand for CNC machine tools either reluctantly buy imported CNC machine tools or reluctantly use domestic CNC machine tools assembled with imported key accessories. Of course, The most is waiting.
Many people are reluctant to spend a high price on foreign imported CNC. Similarly, they are unwilling to spend twice the price of ordinary machine tools to buy domestic simple CNC with low precision and imperfect functions. When ordinary machine tools are used for mass processing, it's no big deal to use more machine tools and disperse the processes. After all, the CNC lathe in this era has not been powerful enough.
The most important thing is that the production of large quantities of parts cannot be too complex. Similarly, the machining accuracy is not high compared with those complex parts produced in small batches.
”Xiao Yun, you'd better wait in the next office. Why don't you go to other workshops? The mass-produced machine tool guide rail can't compare with that when we made the prototype, so the guide rail of each machine tool is scraped manually... ”I really can't stand Yunfei. These teachers with the most assembly experience can't work because of Yunfei's idle egg pain.
In this way, the original lowest mistakes are constantly appearing. In the early spring when the cold has not completely faded, people with low labor intensity burst out fine beads of sweat on their foreheads.
When the people installed the gears on the splines, Yunfei stood aside again and shouted that they exerted too much force. Zhao bingbiao saw the dissatisfaction on the faces of several others. At the same time, he felt bad in his heart and said dissatisfied to Yunfei.
Yun Fei saw the expressions of several others. When he saw Zhao bingbiao's expression that he didn't welcome you to stay here, he immediately understood in his heart.
”You continue to work, I promise you will only watch while you are watching, and you will never command blindly...” Yun Fei said to Zhao bingbiao with a smile.
”You'd better go to other workshops. The production management of our factory has always been very inadequate. If you don't keep an eye on it, you might have to go the old way. Those workers who came out of the mountain have become old timers. If no one is watching, they will be lazy... ”Zhao bingbiao almost said that you are not welcome here.
How can Yun Fei not hear that he is not welcome here? Think about it. Zhao bingbiao and others have been under great pressure. It has been four months since the smelting workshop of 91 heavy industry started to ignite the furnace for the first time. The main CNC lathes in the factory have not been finalized.
The funds of Jiuyi heavy industry are about to dry up.
For the whole heavy industry, the bonus for two consecutive months is only half of that at the beginning of production!
Most workers know the situation of the company, so no one makes trouble. Everyone works hard and carefully. Everyone knows that if you want to get full or even excess bonus, the premise must be that the CNC lathe produced in the factory can be finalized, bought in the market and recognized by customers.
In four months, Jiuyi heavy industry produced more than 600 common 6132 and 6140 ordinary lathes, but only sold more than 300.
”Who? If you have something to say, fart quickly. Later, I have to see customers... ”Dressed in fashionable spring clothes, built straight long hair into a shawl, and then made Li Lu, the most popular explosive hairstyle in the flower capital in this era, shouting discontentedly on the phone.
I'm in a bad mood these days. I don't know where so many calls come to my office one day.