Countercurrent 1982

Chapter 396 Snacks
The two of them ate this meal for nearly two hours in the evening, and talked about many things during the period. At this moment, Jiang Jianhua really let go of some prejudices against Duan Yun before, and he admired him more and more. Young people from the younger generation come.

Jiang Jianhua was particularly surprised by Duan Yun's business acumen and financial resources. Duan Yun told him some things about his electrical repair and antenna business. This is a legal business in itself, so there is nothing to shy away from.

It's just that Duan Yun didn't reveal his real family background to Jiang Jianhua, he just said that now he has a household of [-] yuan, and the outside business earns more than his salary.

Moreover, Duan Yun's mature conversation and mind also changed Jiang Jianhua's previous impression that he was a "slut-headed youth", which was indeed beyond his expectations.

Jiang Jianhua had always been with Yuan Xuedong before. Yuan Xuedong may be richer than Duan Yun, but he is not as generous as Duan Yun. He also gave Jiang Jianhua some small favors before, but compared to Duan Yun, it was 800 yuan when he made a move. His generosity is simply not worth mentioning.

And most importantly, Duan Yun promised that he would 'lend' his youngest son money to him when he got married. This undoubtedly solved Jiang Jianhua's biggest worry in his life. The cloud has been 'working' for a long time.

Besides, Duan Yun has education, technology and backing. His future is limitless. Standing on this 'mountain top', even if he falls, he won't fall hard. After all, Duan Yun is a college student, so there is no doubt that he will be reused in the future .

The two chatted more and more cheerfully, and the wine and food were full. Duan Yun packed the remaining bottle and a half of Moutai and all the wine and vegetables on the table and gave them to Jiang Jianhua. Being frugal, these wines and dishes are enough for his whole family to eat for two meals.

Jiang Jianhua who got the things was also very happy. Now he has begun to flatter Duan Yun face to face.

After the two left the hotel, Duan Yun drove Jiang Jianhua to the gate of the community, and then waved to each other and left.

After watching the car that saw Duan Yun leave, Jiang Jianhua had a smile on his face. He didn't go upstairs and go home immediately, but walked under the street light, opened his leather bag and took out the paper bag containing the money.

The money came so easily that Jiang Jianhua felt a little unreal, and he wanted to feel the thickness of the wad of banknotes.

But when Jiang Jianhua took out the bag of banknotes, he brought out some letter papers in the bag.

Jiang Jianhua picked up the letter paper from the ground and took a look, and found that it was exactly the application material he had written to report Duan Yun when he was at work during the day.

The next moment, Jiang Jianhua took out the remaining reporting materials from the bag, tore them into pieces in twos and then threw them into the rubbish dump by the side of the road...

……

The next morning, Duan Yun went to work in the company as usual.

Duan Yun's plan today is to solve the heat treatment process of gears.

Heat treatment is a very important procedure in gear machining, which can increase the hardness of the gear and improve its mechanical properties.

The basic requirements for gear materials are: the tooth surface should have sufficient hardness and wear resistance, and the tooth center should have sufficient toughness to prevent various failures of the tooth surface. At the same time, it should have good cold and hot processing technology. In order to meet the various technical requirements of the gear.

Commonly used gear materials are various grades of high-quality carbon structural steel, alloy structural steel, cast steel, cast iron and non-metallic materials.Generally, forgings or rolled steel are used.

In Duan Yun’s previous life, gears were mainly produced with 20CrMnTiH steel. At the same time, according to different car models and processing techniques of different gear factories, 20CrMnTm can be divided into H1, H2, H3 and other sub-steel series with different hardenability bandwidths. These are carburized steels, which are usually low-carbon steels with a carbon content of 0.17%-0.24%, which are basically used in the processing of domestic automobile wheels in later generations.

However, Duan Yun can only use the low-carbon steel produced by the steel casting workshop of the general factory at present. The performance was not very good just now, but it can basically meet the requirements of current domestic manufacturers.

There is a small heat treatment workshop in the big group. The place is not big. There are two domestically produced machines in the 70s, but they have not been used much. They are basically idle all year round. The machine is back in service.

Later generations of gear factories used carburizing furnaces for heat treatment of gears, but at present there is no technology and equipment in this area in China, and only simple-designed heating furnaces can be used.

When Duan Yun was at the main factory before, he had a detailed understanding of the heat treatment process at the main factory, and found that the heat treatment process left by the earliest Soviet Union had lagged behind seriously, and the hardness and mechanical properties of the gears after heat treatment were average.

In this regard, Duan Yun thought of an improvement plan by recalling the various parameters of the same kind of heat treatment in the factory when he worked in the locomotive factory in his previous life.

Duan Yun’s improvement plan is to use 950 °C for normalizing, which is 50 °C higher than the original process, which can further eliminate forging stress and refine grains.One-time co-infiltration and direct quenching replace the original one-time carburizing and two-time heating and quenching process, which not only simplifies the process, but also avoids oxidative decarburization caused by multiple heating and cooling.

Co-infiltration at 890°C is 30°C lower than the carburizing temperature, so that during quenching, it can slow down the decomposition rate of austenite below the point, reduce structural stress and thermal stress, not only reduce deformation, but also make austenite More stable, thereby improving the hardenability of the co-infiltration layer.

In Duan Yun's view, if the heat-treated gears are processed according to his heat treatment process, the gears after heat treatment will be higher than the gears of the main factory, regardless of strength or other parameters.

For a whole morning, Duan Yun organized workers to repair and debug the two heating furnaces, replacing some aging and rusted lines and components.

"Master." When he was about to get off work at noon, Da Jun entered the workshop and found Duan Yun, handed over a form and said, "This is the attendance sheet of each department in the morning."

"En." Duan Yun took the attendance sheet and glanced at it, then said to Da Jun, "Da Jun, help me with something this afternoon."

"whats the matter?"

"You take this money..." While speaking, Duan Yun took out a few banknotes from his pocket, handed them to Da Jun, and said, "After you have lunch at noon, go to the city to buy some snacks, such as dried apricots, sorghum cane , buy more white rabbit toffee, spiced melon seeds..."

"Why buy so many snacks?" Da Jun was taken aback when he heard this. In his impression, Duan Yun basically had no hobby of eating snacks except smoking.

"... After buying the things, wrap them into a big bag. After the main factory goes to work in the afternoon, send it to Cheng Qingyan for me, and tell him that it is not convenient for me to go to the main factory now. I will find her at night." Duan Yun settled down.

The reason why Duan Yun asked Da Jun to buy snacks to send over was actually to maintain the "temperature" of the current relationship between the two of them, and to make a gesture of actively pursuing Cheng Qingyan.

Girls' minds are generally very sensitive, especially to the actions of boys they like. In the past, the two of them were just ordinary classmates and colleagues, and they only needed to keep getting along normally. Cheng Qingyan confessed, and began to develop towards a lover, so Duan Yun could not be as casual as before, and had to be more active and enthusiastic, and always let Cheng Qingyan understand that she was always thinking of her in her heart...

"No problem! I promise to send it over there." Dajun was suddenly stunned when he heard the words, and then responded with a smile.

(End of this chapter)