Chapter 186

"Xiao Yun, tell me, how should this problem be solved?" In the machining workshop of Chengdu xinkaixing ball screw factory, Wang Qingfeng stared at Yun Fei with a gloomy face.

"How is your production process arranged? Are those Soviet engineers just eating instead of working? " Yun Fei took several points on the ball screw produced on site with a micrometer, and the measured size of each point changed very slightly.

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 makes a knife in the grinding process. The middle of such a short screw is a whole bit larger than both ends! For a two or three meter long ball screw, grind the circular arc spiral groove on the ball screw against the center holes at both ends. On the screw with almost no rigidity, the phenomenon of cutting is more obvious. At that time, I don't know how much the middle will be larger than the two ends.

In this way, these ball screw can not achieve the design accuracy at all. Where can the NC machine tool using such ball screw ensure the machining accuracy?

"The No. 45 steel we use is quenched and tempered after being hammered. The lathe is used for rough machining of the screw grooves, 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 the ball screw, it is impossible to know nothing about the production process.

In particular, Wang Qingfeng was born as a mechanic. Coupled with his boss, he had to do everything himself.

"Didn't I tell you to use bearing steel GCr15? Why use 45 steel? " The cloud is not speechless.

Bearing steel can also be provided in China. Although the price is higher, the ball screw with high precision and the supporting ball screw nut and ball are very similar in performance, but the difference is quite large.

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

This is the bitter fruit of a blank domestic industry. Although there are no competitors because of the large demand in the domestic market; However, because of this situation, there are no professionals in this field in China. It is not easy to start from scratch.

I told them clearly that they used bearing steel GCr15 to produce ball screw, but they replaced the material with cheaper No. 45 steel. In this age, no matter what you want to do, you have to stare at yourself? Especially in CNC machine tools, although there are many researchers in China, most of them are strictly controlled by the state in national research institutes, and it is impossible to get researchers who know little but have a good foundation.

Yun Fei patted his head. He really has a headache. For such things, Wang Qingfeng is an excellent senior manager, because no matter what his people say, as long as it is reasonable and logical reasoning with written things can convince him, he will agree.

"The Soviets know shit. If they really know that ordinary carbon steel can replace bearing steel, what kinds of steel are there?" Yun Fei was noncommittal about Wang Qingfeng's words. It seems that it is necessary to find a chance to have a good class with the Soviets.

"Lao Wang, who is in charge of technology here?" Yun Fei is too lazy to investigate the person responsible for this matter. Fortunately, it is still in the experimental stage. Because this first production is experimental, only more than 30 semi-finished products one meter and five meters long have been produced.

Yun Fei understood that if it were not for the ball screw they produced this time, it could not meet the accuracy requirements of the design in the grinding process; If it were not for their own Jiuyi heavy industry, it would have been rectified under the auspices of various middle and senior managers during this period; If it were not for the things produced in the ball screw factory jointly owned by Wang Qingfeng, it would be related to the production of the CNC lathe of Jiuyi heavy industry

If I hadn't been in the ball screw factory at this time for many reasons, maybe I wouldn't have asked what material the ball screw was made of until a large number of ball screws produced by the two partner ball screw factory were on the market, or even many years later.

In that case, after their CNC machine tools are sold to the market, after customers use them for a period of time, 91 heavy industry will definitely receive snowy complaints. At that time, Yun Fei can 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. It will join the World Trade Organization in a few years. If the quality does not go up, it will have a disastrous impact on the company in the event of economic recession. Once customer loyalty is lost, it is not easy to find it back.

In this era, China's CNC machine tools, especially domestic CNC machine tools, have always been criticized. The most important thing is the quality problem. 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 solved the problem of ball screw, Yunfei's Jiuyi heavy industry will continue to shrink the market because of quality problems until there is no market share in the end.

Of course, if the price is reduced, in the Chinese market, no matter how much garbage CNC machine tools are, as long as they are CNC machine tools, there will be a market. After all, many mass-produced parts do not have high requirements for machining accuracy.

"Xiao Yun, this is the current director of the Technology Department of our factory, sevianovsky. People in the factory call him dead chicken..." Wang Qingfeng shouted "dead chicken" in the workshop. After that, he saw a thin middle-aged white man in his forties running towards this side.

"Boss, are you looking for me?" Sevianovsky trotted to the boss who called himself "dead chicken" and said a stiff Chinese with his stiff tongue, which made Yun Fei very uncomfortable.

"Why use 45 steel instead of the bearing steel I chose?" Yun Fei stared at each other with a bad face, expecting him to give himself a reasonable explanation.

Although these engineers from the Soviet Union have a good mechanical foundation in their country, as soon as they come here, although Wang Qingfeng gave him the post of minister of Technology Department, he should not make decisions without knowing the situation and change the raw materials he chose and the process route he formulated.

There are many differences between the Soviet Union and China not only in materials, but also in technical standards.

Sevianvsky didn't understand Yunfei's words. He stared at Wang Qingfeng suspiciously. When he saw Wang Qingfeng repeating Yunfei's words, he couldn't understand them. He had to search around for the translation in the factory. Although he had been here for a month or two, the Chinese characters were not only difficult to recognize and write for those who used letters, Even pronunciation is very difficult.

Wang Qingfeng was depressed. At first, when sevianvsky first arrived here, he told the translator that he had to follow where the dead chicken must be during working hours. At this time, he couldn't see the translator. Where did he put his face in front of another shareholder with the same status as him?

"Through the inquiry on the material brand of the national technical standard formulated by China in 1981, I think No. 45 steel can replace bearing steel in most cases..." sevianvsky learned after translating it that this too young boss is actually his own other boss, and his shares are no less than that boss who laughs all day, So seriously explain it to Yunfei.

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

But the production of ball screw is just an important occasion! In particular, the ball screw is also one of the determinants of the accuracy of CNC machine tools!

"..." sevianovsky was noncommittal about Yun Fei's words. How much can such a young man know at the age of 20? Although I have never been in contact with the design and production of high-precision parts such as ball screw, there are many other high-precision parts.

"From now on, change it back to me immediately. You must carry out experimental production in strict accordance with the materials and production process I gave at the beginning, or you will go back to your Soviet Union!" Yun Fei saw the dead chicken biting his teeth, blushing and staring at himself. He also knew that the goods must think that he might be the second generation of rich parents in the family, and he gave orders here.

Yun Fei is angry!

In his world, more than 90% of the materials for the production of ball screw are bearing steel GCr15. Since there are on-site things available, why spend a lot of time and energy comparing various materials? It takes a long time to do the experiment.

In 1993, Taiwan's machine tool manufacturers will enter the domestic market on a large scale. If they can't obtain an absolute advantage in the Chinese market when they build a factory, they will certainly fall into a protracted price war.

"The cost problem doesn't need you to consider now. Even if No. 45 steel can achieve this effect, there won't be much cost left. At that time, it will cause a lot of future problems to the company because of product quality problems..." Yun Fei saw sevianvsky. Although he agreed, the expression on his face said that he was not convinced.