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

The effect of the initially modified heat treatment furnace did not make Duan Yun very satisfied, mainly because the temperature control side was not very good, and there was always a certain error in the temperature in the furnace, and the temperature error of 50 degrees up and down had exceeded the allowable error limit that Duan Yun said.

So in the next two days, Duan Yun organized workers to modify the furnace again, thickened the furnace wall, added a lot of new refractory materials and insulation cotton, and re-modified the heating equipment in the furnace.

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

At present, the Red Star Gear Factory is still using the heat treatment process of the Soviet Union in the fifties, and this set of technology and Duan Yun's previous life in the locomotive factory used to process the heat treatment process of the workpiece in the temperature and heating time have a certain difference, and the same steel in the later generations under the two heat treatment processes, mechanical properties and other parameters also have a certain gap, and the reason why the Red Star General Factory has been unable to produce automobile transmission products before, in addition to the gear processing accuracy can not reach the fifth level, the backward heat treatment process is also an important reason, and Duan Yun so laboriously modified the heat treatment furnace, in order to improve the qualified hardware support for the new process。

In fact, the so-called new heat treatment process is not complicated, Duan Yun only in the original heat treatment process to improve the temperature of heat treatment, as well as the cooling time, the original gearbox gear heat treatment temperature is 900 °C, the new process temperature is reduced to 850 °C, in addition to the workpiece heat treatment cooling method is also different, the main plant is directly quenched with water, and Duan Yun is through the numerical control system, first the furnace heating to complete the gear smoothly cooled to 300 °C, and then use oil to quench, the purpose is to slow down the decomposition rate of austenite below the melting point, reduce the microstructure stress and thermal stress, not only reduce the deformationAt the same time, it also makes the martensitic crystallization inside the steel more perfect, so that the performance parameters of the heat-treated product will be significantly improved.

Considering that the new heat treatment process is relatively advanced in this year, in order to avoid the competition of opponents caused by technology leakage, Duan Yun has made a little move in the digital control panel designed and produced by himself.

Using the chip in his hand, the CNC panel designed by Duan Yun is a full 80°C different from the standard thermometer display in terms of temperature display, that is to say, the furnace temperature of only 770°C can be seen from the CNC panel, but it has actually reached 850°C, so that even the workers who operate the preheating have no way to know the normalizing temperature of the new process.

Even on Duan Yun's operation process book, it is also indicated that the temperature of the workpiece normalizing is 770 °C, which is undoubtedly digging a pit for imitators who steal technology, and this secret is only known to Duan Yun alone.

In addition, the CNC board used by Duan Yun to control the smooth cooling itself is also a very high-tech thing, which is similar to the CNC gear hobbing machine in the main factory, which is not possible for ordinary people.

Controlling the core technology of the key heat treatment process of the new product, Duan Yun is equivalent to grasping the important lifeblood of this factory, and he will not easily make a wedding dress for others in the future, after all, this is a state-owned enterprise, and the equipment and personnel in the factory are all national, and it is difficult to say how long Duan Yun's position can sit, he must leave a way back for himself.

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

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

This time, in addition to the front-line workers in the workshop, the employees of all the offices in the office building were also basically present.

In the past half a month, Duan Yun has strictly implemented the factory rules, exposing the list of absenteeism and late and early departure on the propaganda board every day, and finally received good results.

As for those die-hard elements, when the factory resumes normal production, Duan Yun will free up his hands to clean up these 'tumors'.

Today, the reason why Duan Yun called the people in the factory to come here to watch the first production of the new product is to deepen the sense of honor of the employees in the factory.

Duan Yun produced four imitation gas car gearboxes, a total of eleven gears.

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

"Manager Duan, can you start?" At this time, Luo Fei, the director of the workshop, walked to Duan Yun's side and asked after arranging the personnel and materials in place.

"Begin!" Duan Yun's hands trembled slightly when he said these two words.

For this moment, he and the workers in the factory worked overtime for half a month, although Duan Yun had carefully improved the processing technology of the product, and after rigorous calculations, when it came to the official production of samples, there was still an indescribable tension and excitement in his heart.

"Sting!" With the screeching sound of the cutting machine, the cutting machine rolled rapidly, and a bundle of cylindrical steel was quickly cut into tooth embryos for processing, and was quickly transported to the station by several porters.

At this time, several masters who operated the machine tool wore newly received work clothes and skillfully placed the tooth germ on the modified automatic machine tool for machining.

The efficiency of the four modified automatic lathes is amazing, it took less than 15 minutes to complete all the rough turning of the tooth embryo, and the two quality inspectors also came forward to inspect the tooth embryo for the first time to see if it meets the requirements of the drawing.

Subsequently, two milling machines and two CNC gear hobbing machines hobbed, broached, planed, drilled and milled the tooth embryos, and finally sent them to the heat treatment furnace that Duanyun had successfully refitted.

The heat treatment time is slightly longer, mainly because Duan Yun has changed the original process, and the temperature adjustment and cooling time is extended.

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, and the atmosphere of the workshop was a little tense for more than 200 employees, and everyone watched the entire production process of the new product intently.

The grinding wheel rotates rapidly, grinding and finishing the heat-treated gears.

The full set of eleven gears was all processed, and more than ten workers carried out the final assembly procedure.

Although the workers in charge of the assembly were not skilled and even a little clumsy, it was clear that they were really serious about their work.

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

The attitude of these employees of the large collective towards Duan Yun also changed from the initial suspicion, resistance, and disdain, and gradually began to change to respect for this young manager.

Perhaps the factory has been dilapidated and decadent for too long, and everyone has long been insensitive, so that the changes brought by Duan Yun have given them hope and expectation for this factory again, just like the crops that have been in drought for a long time have come to Ganlin, just like a traveler in the desert has seen an oasis, the road ahead is long, and the dawn is beginning to appear.

In the end, after the successful assembly of eight sets of sample car gearboxes, the scene resounded with prolonged and warm applause.

Some of the old workers' eyes even began to moisten at this time.

And after Duan Yun heard the report of the quality inspector passing the inspection, he couldn't help but breathe a sigh......

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