"As the deputy director in charge of production, I am ashamed. Pen | fun | pavilion www. ｂｉｑｕｇｅ。 ｉｎｆｏ”

After Peng Haiyang finished speaking, Dai Shenghua rushed to speak, and his mouth was just to review, and his sad look was as if he had committed a great crime against the people of the country.

"The 12 cubic meter excavator is a research and development project jointly issued by the Ministry of Machinery, the Ministry of Coal and the Ministry of Metallurgy. As a mechanical system enterprise, Xinmin Hydraulic Tool Factory has the responsibility to provide supporting facilities for Lin Chong. After receiving the notice from the Ministry of Machinery, the cadres and workers of our factory were full of energy and high spirits, and they expressed that they wanted to build a strong country valve and a gas valve, and contribute to the realization of industrial modernization......"

I don't know which Xiucai wrote Dai Shenghua's speech, the flowers are full of flowers, the clouds and mountains are foggy, and he has expressed his determination for ten minutes, and then he got to the point and began to complain:

"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 12 cubic meter excavator was working in a very harsh environment, and the performance requirements for the hydraulic valve exceeded the requirements of other products that we had undertaken in the past, which presented us with new challenges.

Although under the strong care of the leaders of the Ministry of Machinery and the Provincial Department, and with the support of the technical personnel of Lin Chong, especially the capable technical team headed by Director Peng, we completed the production task of the hydraulic valve of the excavator on time and submitted the finished product that met the requirements. However, in the process of industrial experiments, the hydraulic valves produced by our factory still inevitably have quality defects, which has brought certain troubles to the industrial experiment of excavators.

After receiving the official letter from Lin Zhong about the quality problems of hydraulic valves, we organized the engineering and technical personnel and skilled workers of the whole plant to conduct an in-depth analysis of the causes of possible quality problems of hydraulic valves, and put forward a total of 17 measures to improve the quality, on the basis of which new hydraulic valves were produced and sent to the industrial experimental site. ”

Peng Haiyang couldn't help it, he interrupted Dai Shenghua's tirade, and said: "However, the new hydraulic valve you sent still had the same problem in the end, which shows that you have not properly solved the quality problem of the original hydraulic valve." Director Dai, you should admit this, right?"

"We've solved part of this problem. "We optimized the composition of the cast iron of the valve body, so that the hardness of the valve body has been effectively improved, and the oil leakage caused by wear and tear has been reduced. We have also improved the machining accuracy of the valve stem, so that the roundness of the valve stem has been reduced from 0.3 wires to 0.2 wires ......"

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

Lin Bei Heavy Machinery itself does not produce hydraulic parts, and Peng Haiyang himself is not studying this direction, at least he can't understand what Tao Yu is saying. For example, the difference between 0.3 wire and 0.2 wire is really not good for people who don't do this business.

"We are very grateful for the improvements that Chief Tao just said. However, as far as the oil leakage problem of the hydraulic valve is concerned, we asked the experts of the Coal Research Institute to identify it, and they believe that the main cause of the oil leakage is the scratch of the valve stem, which was confirmed by the technicians you sent to the test site. The reason for the scratches on the valve stem, according to the analysis, is that the valve hole is grinding in the process of sand pressing, for this technical problem, how do you solve it?"

Peng Haiyang could only say the conclusion given by the Coal Research Institute, and the stem scratches were seen by his own eyes, so he naturally couldn't be mistaken. As for the problem of valve hole sand pressing, it can only be said according to the caliber of the experts, and he is not too sure.

Of course, Peng Haiyang must know the concept of sand pressing. The surface of the cast iron material is dotted with carbon-graphite dots, commonly known as soft dots, because the material in these places is softer than in other places. When the surface of a cast iron workpiece is ground with emery, some fine emery grains will be embedded in these soft spots, which is called pressed sand. The presence of sand pressing will cause burr-like protrusions on the surface of the casting, and when the valve stem moves on such a surface, it will produce scratches and lead to oil leakage.

This truth is simple to say, but what is going on in the production of hydraulic valves requires some professional background, and Peng Haiyang undoubtedly lacks this background.

Hearing Peng Haiyang talk about sand pressing, Tao Yu hesitated for a moment, then nodded and said, "What about sand pressing...... Of course there must be. For these hydraulic valves submitted to Lin Chong, we have carried out serious manual sand removal, and have removed the sand to the greatest extent. As for the fact that there are still individual remnants of pressed sand in the end, it is inevitable, such a small sand grain, the naked eye is not clear, simply use tools to remove, how can there be no leakage?"

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

Of course, Tao Yu would not say it to death, he shook his head and said: "This is not necessarily, sometimes if you are lucky, the sand is clean, then there is no sand pressing." In addition, if the honing process is used, there is no emery for grinding, and there will be no sand pressing. ”

"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 silently, but sighed helplessly in his heart. He knew that Tao Yu proposed the honing process, which was a pit waiting for Peng Haiyang to jump in, and Peng Haiyang really plunged into it because he didn't understand this technology.

"In fact, many of the hydraulic parts produced by our factory are also honed by honing process. Tao Yu said lightly, "With the honing process, there will be no sand pressing." However, the 12 cubic meter excavator hydraulic valve can not be finished by honing method, because the honing method has high requirements for the geometric accuracy of the prefabricated hole, and if the geometric accuracy of the prefabricated hole is not enough, it is difficult to achieve precision in the honed workpiece hole. Our hydraulic valve has a special shape and a complex casting process, so the geometric accuracy of the workpiece itself is relatively poor. ”

"This ......" Peng Haiyang was choked all of a sudden, this is the layman's shortcoming. He didn't even know if what Tao Yu said was true, but he said it in a straight way, so how could he refute it? Only then did he realize that the other party took the initiative to mention the honing method, in fact, to divert his thinking and make him make mistakes. Once he said the wrong thing and the other party refuted it with reason, he could not pursue it further.

Seeing that Peng Haiyang was speechless, the people of Xinmin Factory were a little relieved, it seems that the people sent by Lin Bei Heavy Machinery are just like that.

To put it mildly, Linbei Heavy Machinery and Xinmin Factory are neither a systematic enterprise, nor in the same province, the two can be said to have nothing to do with each other, so the leaders of Xinmin Factory do not need to care about Linbei Heavy Machinery's attitude. Can 12 cubic meters excavator development project by the Ministry of Machinery, the Ministry of Coal and the Metallurgical Bureau of the three jointly carried out, Xinmin plant is a mechanical system of enterprises, subordinate to the Mingzhou Provincial Machinery Department, and the Provincial Machinery Department is the Ministry of machinery of the subordinate, so the new plant in this matter also has a responsibility.

The three ministries and commissions jointly carried out research, the main engine factory Linbei Heavy Machinery is an enterprise of the Ministry of Coal, and the other two ministries and commissions are mainly responsible for supporting each other, and there is also some competition between each other. If Xinmin Factory loses the chain in this matter, and finally loses the face of the Machinery Department, the Machinery Department will definitely be unhappy. If you want Lin Bei Heavy Machinery not to complain to the Ministry of Machinery, you must block the other party's mouth, Dai Shenghua and Tao Yu's reasoning, so that Peng Haiyang has nothing to say, this is the victory of Xinmin Factory. In the future, if the Ministry of Machinery wants to pursue this matter, Xinmin Factory also has something to say.

Peng Haiyang knew that he had been fooled, and wanted to retract what he had just said, and then go back to talk about grinding and pressing sand, but he didn't know where to start. He turned his head and glanced at Feng Xiaochen and said, "Xiao Feng, didn't Chief Engineer Chang also tell you about sand pressing, what do you think, you can also talk about it." ”

Peng Haiyang is what it means to rush to the doctor, he doesn't want to think about it, he himself has been surrounded by the people of Xinmin Factory, Feng Xiaochen is just a young man under 20 years old, and he has no experience in business, how can he say anything weighty? If Feng Xiaochen makes any jokes again, their trip will really be in vain.

Feng Xiaochen did not think so about Xinminchang's explanation, the grinding process does have the hidden danger of sand pressing, but if the grinding tools are selected properly, the particle size of the emery is correct, and the sand cleaning and polishing process is strict afterwards, this defect can be completely eliminated. In the final analysis, either the technology of Xinmin Factory is not up to par and the grinding process is not deep enough, or the investment in man-hours is not enough, or the quality control is not strict, which will cause such an obvious phenomenon of sand pressing. Peng Haiyang didn't know these questions, but Feng Xiaochen knew them.

However, Feng Xiaochen did not intend to challenge Xinmin Factory at this time, after all, he had not seen the production process of Xinmin Factory, and he did not know what the problems were. Sand pressing is only one aspect of the defect of the hydraulic valve, although the current exposure is this aspect of the problem, but who knows if there are other problems? At this time, all the attention is focused on the problem of sand pressing, which is inevitably a headache and a pain in the feet.

Thinking of this, he smiled at everyone and said, "I don't know much about technology, and this time I am an assistant to Director Peng, mainly to learn from the big brothers of Xinmin Factory." I can't say what happened to things like sand pressing. I think that Director He and Director Dai can give us a chance to visit the production process of Xinmin Factory, and I believe we will learn a lot from it. ”