"Xiaoyun, tell me, how should this problem be solved?" In the machining workshop of Xinkaixing Ball Screw Factory in Rongcheng, Wang Qingfeng stared at Yun Fei with a gloomy face.

"How did you arrange your production process? Did those Soviet engineers just eat but not work?" Yun Fei used a micrometer to take several points to measure the ball screws produced on the site, and the size measured at each point had very slight changes.

The ball screw measured by Yunfei is not very long, only more than 300 mm and less than 400 mm. Such a short ball screw has a knife phenomenon during the grinding process. Such a short screw is actually a whole thread larger in the middle than both ends! If this two or three meters long ball screw grinds the arc-shaped spiral groove on the ball screw against the center holes at both ends. On the screw rod that is almost unrigid, the knife phenomenon will be even more obvious. At that time, I don’t know how much larger the middle than both ends.

In this way, these ball screws cannot achieve the design accuracy at all. Where can we ensure the processing accuracy using CNC machine tools such ball screws?

"The No. 45 steel we used is forged and tempered, and the thread grooves are roughly processed using the lathe, and then the surface is quenched at high frequency, and finally grinding." Although Wang Qingfeng, the general manager of the ball screw factory, does not know much about ball screws, it is impossible for him to have no idea about the production process.

In particular, Wang Qingfeng was a mechanical worker, and as his boss, he had to experience everything in person.

"Didn't I tell you that you should use bearing steel gcr15? Why do you need to use No. 45 steel?" Yun Fei was speechless.

Bearing steel can also be provided in China. Although the price is higher, the ball screw with high accuracy requirements and matching ball screw nuts and ball balls are very similar in performance, but the difference is still quite large.

"Soviet engineers said that our No. 45 steel has similar performance to bearing steel. No. 45 steel is easier to process than bearing steel. Especially after heat treatment, No. 45 steel can only reach a maximum of hrc Rockwell hardness of 48 degrees. Moreover, even if it reaches such a hardness, the material has no toughness. The ball screw made in this way will not have much service life at all." Yun Fei shook his head and sighed.

This is the bitter fruit caused by the blankness of the domestic industry. Although there are no competitors due to the large demand in the domestic market, it is precisely because of this situation that there are no professional talents in this field in China. Starting from scratch is not an easy task.

I clearly told them that they used bearing steel GCR15 to produce ball screws, but they replaced the material with a cheaper No. 45 steel. Is it necessary to keep an eye on what I want to do in this era? Especially in terms of CNC machine tools, although there are many people studying this aspect in China, most of them are strictly controlled by the state in national research institutes. It is impossible to get researchers who do not know much but have a good foundation.

Yun Fei patted his head. He had a headache. Wang Qingfeng was a very excellent senior manager for such a thing, because no matter what his subordinates said, as long as they were reasonable and logical reasoning could convince him with logical reasoning in writing.

"The Soviets know nothing. If they really knew that ordinary carbon steel could replace bearing steel, then what kind of steel was divided into?" Yun Fei ignored Wang Qingfeng's words. It seemed that it was necessary to find an opportunity to teach the Soviets well.

"Lao Wang, who is in charge of the technology here?" Yun Fei was too lazy to hold the person responsible for this matter. Fortunately, it is still in the experimental stage. This first production was experimental, so the quantity was only produced more than 30 semi-finished products that were 1.5 meters long.

Yun Fei understood that if the ball screws they produced this time could not meet the design accuracy requirements during the grinding process; if it weren't for the rectification of their own Jiuyi Heavy Industry under the leadership of various middle and senior management during this period; if it wasn't for the things produced in the ball screw factory he and Wang Qingfeng, it would be related to the production of his Jiuyi Heavy Industry's CNC lathe...

If it weren't for many reasons that I had arrived at the ball screw factory at this time, maybe when the ball screws produced by the ball screw factory they jointly launched in large quantities, they would even have been many years later, and I wouldn't have asked what materials used for the ball screws to produce.

If that happens, after the customer uses it for a while, Jiuyi Heavy Industry will definitely receive a snowflake-like complaint. By that time, Yun Fei will only cry without tears. Especially in a few years, the competition in the domestic CNC machine tool market will become fierce.

China has now begun to enter the era of market economy and will join the World Trade Organization WTO in a few years. If the quality is not improved, it will have a catastrophic impact on the company when it encounters economic downturn. Once the customer's loyalty is lost, it will not be an easy task to recover it.

In this era, the most important reason why China's CNC machine tools, especially domestic CNC machine tools, has always been criticized is the quality issue. Although the domestic market is blank now, as long as Jiuyi Heavy Industry can produce CNC machine tools, it will definitely occupy a large number of markets soon. However, after other manufacturers later solved the problem of ball screws, Yunfei's Jiuyi Heavy Industry will continue to shrink due to quality issues until it finally has no market share.

Of course, if the price is reduced, in the Chinese market, no matter how garbage CNC machine tools are, as long as they are CNC machine tools, there will be a market. After all, many large-scale production parts and products do not have very high requirements for processing accuracy.

"Xiaoyun, this is the current technical director of our factory. Sevionvsky. Everyone in the factory called him a dead chicken..." After Wang Qingfeng shouted "Dead chicken" loudly into the workshop, he saw a middle-aged and thin white man in his forties running towards him.

"Boss, are you looking for me?" Sevionvsky trotted to the boss who called him "dead chicken" and spoke a stiff Chinese with his stiff tongue, which made Yun Fei feel extremely awkward.

"Why should I use No. 45 steel instead of the bearing steel I chose?" Yun Fei stared at the other party with a bad expression, hoping that he would give him a reasonable explanation.

Although these engineers from the Soviet Union had a good mechanical foundation in their country, when they came here, although Wang Qingfeng gave him the position of Minister of Technology, he should not make a decision without understanding the situation, and change the raw materials he chose and the process route he formulated.

The Soviet Union and China have many differences not only in terms of materials, but also in terms of technical standards.

Sevionvsky did not understand Yun Fei's words, stared at Wang Qingfeng with confusion. When he saw Wang Qingfeng repeating Yun Fei's words, he couldn't understand it. He could only search for the translations in the factory. Although he had been here for a month or two, in Chinese, for those of them who use letters, square characters are not only difficult to recognize and write, but even pronunciation is extremely difficult.

Wang Qingfeng was depressed. At first, when Seviansky first arrived here, he told the translator that he had to follow wherever he had to go during working hours. At this moment, he could not see the translator. Where did he put his face in front of another shareholder with the same status as him?

"By searching for the national technical standards formulated by China in 1981 on material grades, I think that in most occasions, No. 45 steel can replace bearing steel..." After Seviansky translated, he realized that the overly young person in front of him was his other boss, and the shares in his hand were no less than the boss who laughed all day long, so he explained to Yun Fei seriously.

"Don't tell us, you didn't analyze the materials!" Yun Fei interrupted impatiently about the person in front of him. How could he not know that in some not very important occasions, No. 45 steel can replace many materials.

However, the production of ball screws is a very important occasion! In particular, ball screws are one of the decisive factors of the accuracy of CNC machine tools!

"..." Sevianwsky said nothing about Yun Fei. How much can such a young man in front of him know when he is twenty years old? Although he has never been exposed to the design and production of high-precision parts products such as ball screws, there are also many other high-precision parts products designed.

"From now on, I will change it back immediately. I must strictly follow the materials and production processes I gave at the beginning to conduct experiments and production, otherwise you will go back to your Soviet Union!" Yun Fei saw this dead chicken gritting his teeth and staring at him with a red face. He also knew that this guy must think that he might be the rich second generation of his father's family, and he was in charge of his blind command here.

Yun Fei was angry!

In his world, more than 90% of the materials used for ball screw production are bearing steel gcr15. Since there are things available on site, why do you need to spend a lot of time and energy to compare various materials? This will take a long time to do an experiment.

In 1993, Taiwan machine tool manufacturers are about to enter the domestic market. If they cannot gain an absolute advantage in the Chinese market by building the factory, they will definitely fall into a protracted price war.

"You don't need to consider the cost issue now. Even if the No. 45 steel can achieve this effect, there will be no cost left. At that time, it will cause a lot of trouble to the company due to product quality issues..." Yun Fei agreed when he saw Sevianwsky, but the expression on his face indicated that he was not convinced. (To be continued, please search for Astronomy, the novel is better, updated and faster!
Chapter completed!