Countercurrent 1982

Chapter 426 The First Batch of Samples

In the next few days, Duan Yun has been working overtime to debug the heating furnace.

Duan Yun was not very satisfied with the effect of the refitted heat treatment furnace at first, mainly because the temperature control was not handled well, and there was always a certain error in the temperature in the furnace. Allowable margin of error.

So in the next two days, Duan Yun organized workers to refit the furnace again. The furnace wall was thickened, and a lot of new refractory materials and insulation cotton were added. In addition, the heating equipment in the furnace was also refitted. Finally, Duan Yun A numerical control board was also made, which enabled the old heat treatment furnace to have an accurate automatic timing temperature control function, further improving the temperature control ability of the preheating furnace.

In addition to equipment modification, Duan Yun also modified the gear heat treatment process.

At present, the Red Star Gear Factory is still using the heat treatment process of the Soviet Union in the 50s, and this process is different from the heat treatment process used by Duan Yun in the locomotive factory in the previous life in terms of temperature and heating time. Under this heat treatment process, there is a certain gap in mechanical properties and other parameters. The reason why Hongxing General Factory has not been able to produce automotive gearbox products before is that the gear processing accuracy cannot reach level [-], and the heat treatment process is also an important reason. The purpose of Duan Yun to refit the heat treatment furnace so hard is to provide qualified hardware support for the new process.

In fact, the so-called new heat treatment process is not complicated. Duan Yun just increased the heat treatment temperature and cooling time in the original heat treatment process. The heat treatment temperature of the original transmission gear was 900°C, and the new process temperature was reduced to 850°C. The cooling method of the workpiece heat treatment is also different. The main factory is directly quenched with water, while Duan Yun uses the numerical control system to gently cool the gears heated in the furnace to 300°C, and then quench them with oil. Its purpose is to slow down the decomposition rate of austenite below the melting point, reduce the structural stress and thermal stress, not only reduce deformation, but also make the martensite crystallization inside the steel more perfect, so that the performance parameters of the heat-treated products will be improved. There is a significant improvement.

Since Duan Yun was reborn, he has always had the habit of never spreading the core technology to the outside world, and this time is no exception. Considering that the new heat treatment process is relatively advanced in this year, in order to avoid competition from rivals caused by technology leakage, Duan Yun In the digital control panel designed and made by myself, a little trick has been moved.

Using the chip in his hand, the temperature display of this CNC panel designed by Duan Yun is 80°C higher than that displayed by the standard thermometer. That is to say, the furnace temperature is only 770°C from the CNC panel. It has reached 850°C, so even the workers who operate the preheating have no way of knowing the normalizing temperature of the new process.

Even in Duan Yun's operating manual, it is also indicated that the temperature of the workpiece for normalizing is 770°C. This is undoubtedly a hole dug for imitators who steal the technology. Only Duan Yun knows this secret.

In addition, the CNC board that Duan Yun uses to control the stable cooling is also something with high technical content. This is similar to that on the CNC gear hobbing machine of the main factory, and ordinary people cannot make it.

Controlling the core technology of the key heat treatment process for new products, Duan Yun is tantamount to grasping the important lifeblood of this factory. In the future, he will not easily make wedding dresses for others. After all, this is a state-owned enterprise, and the equipment and personnel in the factory are all state-owned. It's hard to say how long Duan Yun will be in the position of manager. He has to leave a way out for himself.

In fact, if Duan Yun hadn't kept a hand in the CNC gear hobbing machine of the main factory, then the factory director Qin Gang and other factory leaders would not be so cautious and polite to Duan Yun.

After everything was ready, on Thursday morning, Duan Yun gathered all the employees in the factory in the workshop, preparing to witness the production of the first gearbox product of the labor service company.

This time, apart from the front-line workers in the workshop, employees from all the offices in the office building were also present.

In the past half a month, Duan Yun strictly enforced the factory regulations, and exposed the list of absentees, latecomers and early leavers on the bulletin board every day, and finally received good results, except that there are nearly 20 diehard elements who are still "fighting against the wind". The other employees have already obediently gone to work normally, and the secretary Jiang Jianhua is also indispensible for this.

As for those diehards, after the factory resumes normal production, Duan Yun will free up his hands to deal with these 'cancers'.

The reason why Duan Yun called people from the factory here today to watch the first production of new products is to deepen the sense of honor of the employees in the factory.

Duan Yun produced a four-front and one-down imitation GAZ car gearbox, with a total of eleven gears.

For the first batch of samples, Duan Yun plans to make six sets, of which two sets will be kept in the factory as souvenirs and samples, and the other four sets will be sent to large automobile factories for inspection.

"Manager Duan, can we start?" At this time, Luo Fei, the workshop director, arranged the personnel and materials in place, and asked Duan Yun.

"Start!" When Duan Yun said these two words, his hands trembled slightly.

For this moment, he and the workers in the factory have worked overtime for half a month. Although Duan Yun has carefully improved the processing technology of each product and has undergone rigorous calculations, when the formal production of samples begins , There is still an indescribable tension and excitement in my heart.

"It's piercing!" With the ear-piercing sound of the cutting machine, the cutting machine rolled rapidly, and a bundle of cylindrical steel was quickly cut into tooth blanks for processing, and was quickly transported to the work station by several porters.

At this time, several master craftsmen who operated the machine tool were wearing newly received work clothes, and skillfully placed the tooth embryos on the modified automatic machine tool for machining.

The efficiency of the four modified automatic lathes is astonishing. It took less than 15 minutes to complete the rough and fine turning of all the tooth embryos. Two quality inspectors also went forward to inspect the tooth embryos immediately to see if Comply with drawing requirements.

Subsequently, two milling machines and two CNC gear hobbing machines hobbed, pulled, planed, drilled and milled the tooth embryo, and finally sent it to the heat treatment furnace successfully modified by Duan Yun.

The heat treatment time is slightly longer, the main reason is that Duan Yun changed the original process, and the time for temperature regulation and cooling was prolonged.

After the heat treatment, the quenched gears are cooled for more than half an hour before entering the final gear grinding process.

The whole processing process went very smoothly. The atmosphere in the workshop surrounded by more than 200 employees was a bit tense, and everyone was watching the whole production process of the new product intently.

The grinder rotates at high speed, and the gears after heat treatment are ground and finished.

A complete set of eleven gears has been processed, and more than ten workers are in the final assembly process.

Although the workers responsible for the assembly were unskilled and even clumsy, it could be seen that they were really working hard.

The changes Duan Yun brought to this factory are obvious to all.

The attitude of these employees of the large group towards Duan Yun also changed from initial suspicion, resistance, and dismissiveness to respect for the young manager.

Maybe the factory has been dilapidated, decadent and negative for too long, and everyone has long been numb to the heart, so that the changes brought about by Duan Yun have given them hope and expectation for this factory again, like the long-drought crops waiting for the rain, like a traveler in the desert Seeing the oasis, the road ahead is long, and the dawn is dawning.

Finally, after the eight sets of sample automobile gearboxes were successfully assembled, there was sustained and warm applause at the scene.

The eye sockets of some old workers even began to become moist at this time.

And Duan Yun couldn't help heaving a sigh of relief after hearing the quality inspector's report of passing the inspection...

(End of this chapter)