"The one on the left is Miao Lei's father, and the one on the right is Section Chief Xiang, Xiang Jiyong." Ning Mo whispered to Qin Hai as he introduced the two people who came over.

Qin Hai nodded, stepped forward, and said to Miao Funan: "Director Miao, I am a technical school student who has just been assigned this year, I am studying casting, and the labor department asked me to come to the foundry workshop to do sand turning, this is my letter of introduction." ”

As he spoke, Qin Hai handed the letter of introduction from the Labor and Management Section to Miao Funan. Miao Fujian took the letter of introduction, quietly exchanged a look with Xiang Jiyong, and then said: "Oh, your name is Qin Hai, let me ask you, what did you learn in the technical school?" ”

Qin Haidao: "I mainly studied casting, and I also learned some heat treatment in piggyback. In addition, I usually like to read books, so I know a little bit about the properties of materials. ”

Qin Hai said this because he wanted to leave an opening for himself. He showed his hand in front of Xiao Dongping yesterday, and he could judge the quality of steel just by visual inspection and sound discrimination, which cannot be explained by the study of technical school. He said that he usually likes to read, so he learned something extra, so that he can find an excuse for all the knowledge he has.

"Oh? Young people, not very old, not small. Xiang Jiyong lost no time in interjecting. He came to the foundry workshop today to find a chance to try Qin Hai's skills. Now that Qin Hai is speaking wildly, Xiang Jiyong just seized this opportunity to test Qin Hai without revealing anything.

"Uncle Xiang, Dad, Qin Hai is really capable." Miao Lei said to Xiang Jiyong and Miao Funan, "He can do quenching, and he does it well." ”

Miao Lei was anxious to recommend Qin Hai to his father and Xiang Jiyong, but unexpectedly fell into Xiang Jiyong's arms. He followed Miao Lei's words and asked Qin Hai, "Really? Do you know quenching? ”

Qin Hai felt that he was a bit on a thief ship, Miao Lei was too talkative, and he was roasted on the fire. He didn't know what the expressionless production section chief was thinking, so he had to say vaguely: "Section Chief Xiang stopped me when he said this, the quenching process is broad and profound, how dare I say that I fully understand." However, I have learned a little about the conventional heat treatment of commonly used types of steel, but I don't know which one the section chief of Lu Dao asked about. ”

Xiang Jiyong looked left and right, then pointed to a piece of equipment next to him with his hand, and asked Qin Hai, "Do you know what this device is for?" ”

Qin Hai glanced at it and immediately replied: "I've seen this in school, this is a high-frequency induction hardening furnace, which is used to quench the surface of parts." ”

"Well, what does case quenching mean?" Xiang Jiyong asked again.

Of course, such a question couldn't help Qin Hai, he didn't even have a little stumbling, and replied fluently: "Surface quenching is to quench only the surface layer of the workpiece, without affecting the heart of the workpiece. In general, the surface quenching is done to a depth of between 0.5 and 2 mm, and the processing objects are medium carbon steels and medium carbon alloy steels. ”

"So, why do you do surface quenching? Wouldn't it be better to be fully quenched? Xiang Jiyong continued to ask.

Qin Haidao: "The choice of quenching depth depends on the purpose of the workpiece. Surface quenching is mainly used for parts that work under dynamic load and friction conditions, such as gears and crankshafts used in agricultural machinery. The performance requirements of these parts are that the surface has high hardness and wear resistance, and the core maintains sufficient plasticity and toughness. Therefore, quenching must be limited to its surface and not be fully quenched. ”

"Not bad!" Xiang Jiyong's face showed smile lines, as a production section chief, he naturally had some understanding of conventional production techniques. However, he just knew it but didn't know why. For example, surface quenching, he knows that it is a necessary process link for the processing of gear parts, but it is impossible for him to say it so accurately. His job is to make the workshop operate according to the design of the technical engineer of the technical department, and as for the principle, he will not delve into it.

"How about it, Director Miao, Section Chief Xiang, Qin Hai's ability is good, right?" Ning Mo laughed, and Qin Hai showed his face in front of Xiang Jiyong, making him feel that he also had a light on his face. Anyway, he was the first person in the factory to know Qin Hai, and he was Qin Hai's good buddy.

Xiang Jiyong heard Ning Mo speak, turned his head to him, and said with a straight face: "Fatty, Xiao Lei, you know Qin Hai, you have to learn from others, do you know the Tao?" Don't know how to play cards and play games all day long. People are the same age as you and know so many things, look at yourselves. ”

"Uh...... In fact, we only met Qin Hai yesterday, don't we plan to worship him as a teacher......" Ning Mo was somewhat timid towards Xiang Jiyong, because this production section chief had a bit of an iron-fisted style of grasping labor discipline and the like, although Ning Mo was Ning Zhongying's son, he was also severely deducted from his salary by Xiang Jiyong several times.

"You two go to work first, Qin Hai, you come with me." Xiang Jiyong finished training Ning Mo and Miao Lei, sent them away, and then said to Qin Hai.

"What do Section Chief Xiang command?" Qin Hai asked.

"Just come with me, Section Chief Leng is waiting for you in Director Miao's office." Xiang Jiyong said.

The three of them came to the director's office in the corner of the workshop, and Leng Yuming, the head of the technical section, was really sitting in the room. After chatting with Xiao Dongping yesterday, Leng Yuming was pondering the issue of improving the quality of rotary tillage blades, thinking about it for a night, and as soon as he got to work today, he pulled Xiang Jiyong to the casting workshop to discuss with Miao Funan, and he didn't expect that Qin Hai was also assigned to the casting workshop, so Miao Funan and Xiang Jiyong went to the school to take the Qin Hai exam.

"This is Leng Yuming, the chief of the technical section of our factory, he is a graduate of Harbin Institute of Technology in the 60s, a genuine college student." Xiang Jiyong first introduced Qin Hai, hoping to use Leng Yuming's background to scare Qin Hai.

Qin Hai has always had a lot of respect for college students in the 60s, not to mention people from a bull school like Harbin Institute of Technology. He nodded to Leng Yuming and said, "Section Chief Leng is a senior, and I'm just a primary school student." ”

Leng Yuming waved his hand, filtered out Qin Hai's compliments, picked up a rotary tillage blade from Miao Funan's desk, and said, "I heard Lao Xiao say, when you drank with him last night, you said that there is a way to improve the quality of our factory's rotary tillage blades?" ”

Qin Hai also guessed that Xiang Jiyong and Leng Yuming's intentions must be related to what he said to Xiao Dongping, so he nodded and said, "Yes, but I just said that there was such a possibility last night. ”

"And now?" Xiang Jiyong heard the mystery in Qin Hai's words, and couldn't help but ask.

Qin Hai smiled: "Now I'm basically sure that I can do it." ”

"For what?" Several leaders were shocked by Qin Hai's wild words, Leng Yuming was helpless, this young man actually dared to say that he could do it.

Qin Haidao: "According to the information I have read, at present, for the wear parts of rotary tillage blades, the commonly used processing technology in foreign countries is to carry out high-frequency induction surfacing treatment on the blade edge. Yesterday I was not sure that our factory has such equipment, just now the section chief tested me, I found that our factory has a high-frequency induction furnace, with this kind of furnace, a little transformation can do high-frequency induction surfacing welding, so I said that it can be done. ”

"Do you know high-frequency induction welding?" Leng Yuming's gaze began to be a little confused when he looked at Qin Hai, he picked up a treasure, this young man is really a treasure.

Leng Yuming has also seen the technique of high-frequency induction surfacing welding in magazines and has an understanding of its general principle. But he didn't know exactly what to do, especially what the equipment looked like. In an era when there is no Internet, it is more difficult to find a little bit of scientific information than to climb to the sky. As soon as Qin Hai said this word, he knew that Qin Hai's idea was right, if the cutting edge of the blade could be treated with high-frequency induction surfacing technology, it was completely possible to increase the service life of the blade by half.

The only question now is how much Qin Hai knows about this technique.

Qin Hai saw Leng Yuming's doubts, he pulled a stack of letterhead paper from the table, grabbed a drawing pencil, and directly drew a process diagram for Leng Yuming on the paper, explaining while drawing:

"Chief Leng, you see, the principle of high-frequency induction surfacing welding is...... The main equipment required for this method is a high-frequency inductor, which is also the core component of the high-frequency induction hardening furnace. In addition, you need to install a fixture to adjust the current, which doesn't cost much. ”

"Oops! That's great! Leng Yuming slapped the table happily, "I've been thinking about this matter for months, and I can't figure out the details of the technique in it, as soon as you say this, I understand it all." By the way, Xiao Qin, where did you learn this? Do technical schools still teach this? ”

"This ...... I guess I taught myself mostly. Qin Hai replied, he didn't dare to say that this was taught by a technical school, otherwise as soon as Leng Yuming inquired about the technical school, he would be a goof.

"When I was in technical school, I was more interested in this knowledge, and sometimes I would go to the provincial library and the library of the technical university to read some miscellaneous books, which is what I saw at that time." Qin Hai said in disguise.

"What is the book? Can I borrow it again? Leng Yuming asked.

Qin Hai shook his head: "I'm a person who reads a lot of books, and I patronize the principles and don't remember the title of the book." However, I can assure you that these principles should be correct. ”

"Of course that's right, as soon as I heard it, I knew that this principle was fine!" Leng Yuming said affirmatively, "I just haven't been exposed to this kind of technique in the past, and I saw this name in the magazine, but I didn't say it clearly." Xiao Qin, as soon as you explain like this, I will understand it all. Lao Miao, this Xiao Qin is a treasure, it's a pity to put him in your workshop, I'll transfer him to our technical department. ”