"As the deputy director in charge of production, I feel ashamed."

After Peng Haiyang finished speaking, Dai Shenghua rushed to speak. He opened his mouth to make a review, and his sad look seemed to have committed a great crime to the people of the country.

"The 12-mile excavator is a research and development project jointly issued by the Ministry of Machinery, Ministry of Coal, and Ministry of Metallurgy. As a mechanical system enterprise, our Xinmin Hydraulic Tool Factory provides supporting facilities for Lin Chong, and has no choice but to pay attention to it. After receiving the notice from the Ministry of Machinery, the cadres and employees of our factory were energetic and full of energy, and expressed their desire to build a strong country valve and a competitive valve to contribute to the realization of industrial modernization..."

I don’t know which scholar wrote the speech of Dai Shenghua. It was filled with flowers and clouds and mist. It showed a full ten minutes of determination, and then I got to the point and started complaining:

"However, due to historical reasons and the lack of our own capabilities, it is difficult for us to complete the task of hydraulic valves of excavators. The working environment of the 12 m2 excavator is very harsh, and the performance requirements for hydraulic valves exceed the requirements of other products we have undertaken in the past, which raises new issues for us.

Although under the strong care of the leaders of the Ministry of Machinery and the provincial department, and with the support of Lin Chong's technicians, especially the capable technical team led by Director Peng, we completed the production task of the excavator hydraulic valve on time and submitted finished products that meet the requirements. However, during the industrial experiment, the hydraulic valves produced by our factory inevitably had quality defects, which brought certain troubles to the industrial experiment of the excavator. In this regard, all the cadres and staff of our factory were in a heavy mood.

After receiving Lin Chong's official letter on the quality of hydraulic valves, we organized engineering and technical personnel and technical workers from all over the factory to conduct in-depth analysis of the reasons why the hydraulic valves may have quality problems. A total of 17 measures to improve quality were proposed. On this basis, a new hydraulic valve was produced and sent to the industrial experiment site."

Peng Haiyang couldn't help it. He interrupted Dai Shenghua's long speech and said, "But the new hydraulic valve you sent out finally had the same problem, which shows that you have not properly solved the quality of the original hydraulic valve. Director Dai, you should admit this, right?"

"We have solved part of this problem." Tao Yu got up to help the cavity. "We optimized the composition of the cast iron of the valve body, effectively improving the hardness of the valve body, and reducing the oil leakage caused by wear. We also improved the processing accuracy of the valve stem, so that the non-roundness of the valve stem is reduced from the nationally stipulated 0.3 wire to 0.2 wire..."

He talked about seven or eight parts of the process improvement, and the implication was that Xinmin Factory had already worked very hard in this regard, and it was inappropriate for Lin Chong to be too demanding.

Linbei Heavy Machinery does not produce hydraulic parts itself, and Peng Haiyang himself is not studying this direction. At least he doesn’t understand what Tao Yu is talking about. For example, the difference between 0.3 wire and 0.2 wire is of great significance to hydraulic valves. It is really hard for people who don’t do this industry.

"We are very grateful for the improvements mentioned by Section Chief Tao just now. However, as for the oil leakage problem of hydraulic valves this time, we asked experts from the Coal Research Institute to identify. They believe that the main reason for the oil leakage is scratches on the valve stem, which you sent to the experimental site have also confirmed. The reason for the scratches on the valve stem is that sand pressing occurs during the grinding of the valve hole. How did you solve this technical problem?"

Peng Haiyang could only tell the conclusion given by the Coal Research Institute. He saw the scratches of the valve stem with his own eyes, so he would not make any mistakes. As for the issue of sand pressing on the valve hole, it can only be said according to the experts' caliber, and he was not very sure.

Of course, Peng Haiyang must know the concept of sand pressing. There are some carbon graphite dots distributed on the surface of cast iron materials, commonly known as soft spots. The name is because the materials in these places are softer than other places. When using cartilage to grind the surface of cast iron workpieces, some fine cartilage particles will be embedded in these soft spots, which is called sand pressing. The existence of sand pressing phenomenon will cause burr-like protrusions on the surface of the casting. When the valve stem moves on such a surface, scratches will occur and oil leakage will occur.

This principle is simple, but what exactly happened in the production of hydraulic valves requires some professional background, and Peng Haiyang undoubtedly lacks this background.

When he heard Peng Haiyang talking about sand pressing, Tao Yu hesitated for a moment, then nodded and said, "The problem of sand pressing... Of course, it must exist. When grinding cast iron, no sand pressing does not occur? We have carried out serious manual sand cleaning for the hydraulic valves submitted to Lin Chong, and have already removed sand embedding to the greatest extent. As for the end, there are still some residual sand pressing in the end, which is inevitable. Such a small sand grain cannot be seen clearly by the naked eye. If you simply use tools to remove it, no one can escape the net?"

"So, as long as it is a hydraulic part, sand pressing is inevitable?" Peng Haiyang asked.

Of course Tao Yu would not say anything to death. He shook his head and said, "This may not be necessary. Sometimes when you are lucky, the sand is cleaned, then there will be no sand pressing. Also, if you use the honing process, you will not have sand pressing without the grinding of the carnation."

"Then why don't you use the honing method?" Peng Haiyang felt that he had grasped the loophole in the other party's words and asked anxiously.

Feng Xiaochen sat next to him without feeling, but sighed helplessly. He knew that Tao Yu proposed the honing technique, and he was digging a hole to wait for Peng Haiyang to jump in. Peng Haiyang really dived into it because he didn't understand this technology.

"In fact, many of the hydraulic parts produced by our factory use honing technology." Tao Yu said lightly, "These honing technology will not cause sand compression. However, the product of the 12 m2 excavator hydraulic valve cannot be refined by honing because the honing method requires high geometric accuracy of prefabricated holes. If the geometric accuracy of the prefabricated holes is not sufficient, it will be difficult to achieve precision in the honing workpiece holes. Our hydraulic valve has a special shape and a complex casting process, so the geometric accuracy of the workpiece itself is relatively poor. If the honing method is used, the quality of the current one may not be even achieved."

"This..." Peng Haiyang was choked all of a sudden. This was the shortcomings of the layman. He didn't even know if the trick Tao Yu was telling it was true, but he just said it in a serious manner. How could he refute it? Only then did he realize that the other party took the initiative to mention the honing method was actually to divert his thinking and make mistakes. Once he said the wrong thing and the other party refuted it with reasonable grounds, he could not pursue it further.

Seeing Peng Haiyang speechless, the people from Xinminchang felt a little relieved. It seemed that the people sent by Lin Bei Heavy Machinery were just like this.

To be honest, Linbei Heavy Machinery and Xinmin Factory are neither a system enterprise nor in the same province. The two can be said to have nothing to do with each other. Therefore, the leaders of Xinmin Factory do not need to care about Linbei Heavy Machinery's attitude. However, the 12-mile excavator development project was jointly carried out by the Ministry of Machinery, the Ministry of Coal and the Metallurgy Bureau. Xinmin Factory is a mechanical system enterprise, affiliated to the Mingzhou Provincial Department of Machinery, and the Provincial Department of Machinery is a subordinate of the Ministry of Machinery, so Xinmin Factory also has a responsibility in this matter.

The three ministries jointly conducted research. The main engine factory Linbei Heavy Machinery is an enterprise of the Ministry of Coal. The other two ministries and commissions are mainly responsible for supporting facilities and they also have some intention of competing for each other. If the Xinmin Factory loses the chain in this matter, the final loss of the face of the Ministry of Machinery will definitely be unhappy. If Linbei Heavy Machinery does not go to the Ministry of Machinery to complain, it must block the other party's mouth. Dai Shenghua and Tao Yu's reasoning made Peng Haiyang have nothing to say, and this is the victory of the Xinmin Factory. If the Ministry of Machinery wants to pursue this matter in the future, the Xinmin Factory will have something to say.

Peng Haiyang knew that he was fooled and wanted to take back what he said and then turn around and talk about grinding sand, but he didn't know where to start. He turned to Feng Xiaochen and said, "Xiao Feng, didn't General Manager Chang tell you about sand pressing? What do you think? You can also say it."

Peng Haiyang is the meaning of seeking medical treatment in a hurry. He didn't think about it. He was surrounded by people from Xinmin Factory. Feng Xiaochen was just a young man under 20 years old and had no corporate experience. How could he say anything worthwhile? If Feng Xiaochen makes another joke, their trip will be in vain.

Feng Xiaochen did not agree with the explanation of Xinmin Factory. The grinding process does have hidden dangers of sand pressing, but if the grinding tools are selected properly, the particle size of the cartilage is correct, and the subsequent sand cleaning and polishing process is strict, this defect can be completely eliminated. After all, either the technology of Xinmin Factory is not yet accurate, and the grinding process is not well mastered, or the working hours are not invested enough, or the quality control is not strict, so this obvious sand pressing phenomenon occurs. Peng Haiyang is not clear about these problems, but Feng Xiaochen is well aware of these problems.

However, Feng Xiaochen did not intend to attack Xinmin Factory at this time. After all, he had not seen the production process of Xinmin Factory. He did not know what the problems were. Sand pressing is just one aspect of the defect of the hydraulic valve. Although the problem is exposed at present, who knows if there are other problems? At this time, focusing all your attention on sand pressing is a headache to treat the head and feet.
Chapter completed!