Duan Yun had previous experience in modifying the CNC preheating furnace, so the digital control part of the pit carburizing furnace was easily mastered.

In terms of digitally controlled circuit boards, Duan Yun had already drawn the drawings in advance and sent them to the workshop, and within a day or two, the integrated digital control circuit board would be made.

In addition, in the modification of the furnace body, Duan Yun thickened the shell of this carburizing furnace, the shell was welded with steel plate and section steel, the refractory layer of the furnace lining was made of fiber brick double-layer furnace lining, the heating area was paved with high-strength lightweight refractory bricks, and the insulation layer was composed of diatomaceous earth bricks and aluminum silicate fibers, which thickened the thickness of the refractory fibers of the insulation layer while meeting the use effect, compared with the previous furnace body, it has good thermal insulation performance, which is conducive to significant energy saving.

These refractory bricks and aluminum silicate fibers were bought by Duan Yunrangqian from a company's material library, because they are new products, so the price will be a little more expensive, but compared to the electricity cost saved by its energy saving, it is still very cost-effective.

The heating element is first made of nickel-chromium resistance alloy wire, wound into a spiral shape, this resistance wire has the characteristics of high temperature, processing performance and repeatability, weldability, high emissivity, non-magnetic, good corrosion resistance and plasticity.

In addition to the renovation of these furnaces, Duan Yun also specially designed a set of carbon potential temperature control system, which consists of a closed-loop control system composed of an intelligent carbon potential controller, a special oxygen probe for a thermal shock resistant pit furnace and a solenoid valve.

The principle of this system is also very simple, that is, in the control process, the oxygen probe forms a certain electric potential according to the carbon dioxide atmosphere in the skull, and the electrical parameters are returned to the detector, compared with the optimal process parameters stored in the detector in advance, if the carbon is low, the switch connected with the enrichment agent is opened, and the flow rate of the carburizing medium is increased, thereby increasing the concentration of carbon in the furnace.

If the carbon content in the furnace is high, the switch connected to the diluent is turned on, and the dilution gas enters the furnace, so as to achieve the purpose of reducing the carbon content in the furnace.

If the carbon content is moderate, all switches are turned off.

In order to achieve the effect of rapid temperature control, Duan Yun also installed a ventilator on the furnace lid to stir the temperature and carburizing gas in the furnace, so that the processed parts are evenly heated.

The digital temperature control system set by Duan Yun has greatly improved the accuracy compared with the previous manual control.

Duan Yun's modification plan uses mature technology from the previous life, and some details are not well remembered, so it still needs a period of debugging.

At present, for the two new carburizing furnaces, one of them is run first, various parameters are recorded, and the other one is modified on a large scale, which does not affect production, but also allows his technical transformation work to be promoted.

The technical core of this carburizing furnace modification lies in this digital intelligent control system.

It is said to be a digital system, but in fact, the equipment in Duan Yun's hands cannot make a CNC system in the real sense.

In this era, the computing speed of the computer was relatively low, although the impact on the scientific calculation and data processing at that time was not great, but it could not adapt to the requirements of real-time control of machine tools, including the CNC automatic gear hobbing machine that was modified before, in fact, it used a digital logic circuit, and took a special computer for machine tools as a CNC system, which was called hardware, connected to CNC, referred to as "CNC".

Fortunately, at present, whether it is a gear hobbing machine or a carburizing furnace, the precision function and sensitivity requirements of numerical control are not too high, so with Duan Yun's electronic technology skills, it is easy to use digital logic circuits to build a control system.

However, if Duan Yun wants to modify more powerful and sensitive CNC electronic equipment, he needs some special instruments, including personal computers that can write programs and interface equipment that can input programs to the control chip.

But at the beginning of the reform and opening up in the 80s, it was a fantasy for individuals to buy computers, and even the vast majority of state-owned enterprises did not have personal computers.

The reason for this, on the one hand, is that in the 80s, personal computers were very expensive, mainly imported, an IBM XT imported computer cost 10,000 US dollars, and the price in China was 30,000 yuan, which was unimaginable for ordinary Chinese people with an average salary of only thirty or forty yuan at that time.

On the other hand, there were not many people who knew computer technology in China at that time, and there were no mature software systems such as windows in computers at that time, and the programming was still in bIsac language, which was very difficult and could only be learned by computer courses in universities.

It is precisely because of these two reasons that in the early 80s, there were basically no private computers in China, and even the vast majority of people did not even know what a computer was.

But Duan Yun understands that if he wants to complete the digital modification of domestic equipment, he must have computer equipment, but now how to buy this equipment has become a big problem.

Duan Yun is not short of money now, after nearly a year, selling antennas and speaker equipment, as well as bank loans, he already has more than 200,000 savings, and he is willing to spend more than 30,000 yuan to buy a personal computer, but Duan Yun doesn't know what channel to buy.

There may not be such a thing as a computer in Daxing or even in Shanxi Province, so Duan Yun can only set his sights on big cities like Beijing, Shanghai, and Guangzhou.

Duan Yun himself is lacking in skills, the current production of the factory is in a critical stage, and the new equipment has just been put into production, and many problems need to be solved by him, so he can't travel to these cities, but fortunately, there is still Zhao Changfeng from the sales department.

Early the next morning, Duan Yun called Zhao Changfeng to his office as soon as he went to work.

"Manager Duan, are you looking for me?" Zhao Changfeng asked Duan Yun after walking into the office.

Zhao Changfeng, who had just been promoted to the head of the sales section, could be said to be full of spring breeze, his title and salary were raised by one level, and the most important thing for him was that Duan Yun used him very much.

In the past few months, Zhao Changfeng has accumulated good experience in sales and social networking, and he is familiar with the position of the head of the sales section, and Duan Yun has given him a very high reward.

"Sit!" After seeing Zhao Changfeng walk into the office, Duan Yun smiled and motioned for him to sit down, and then said: "Old Zhao, this time I will give you a task, you go to Beijing on a business trip, and help me see if there are any imported computers sold there." ”

"Imported computers?" Zhao Changfeng was stunned when he heard this, who went to ask Duan Yun, "What is a computer?"

Although Zhao Changfeng has a bit of knowledge, he has never heard of the word computer, and he has only heard of such a thing as a computer in the newspaper before, and computers are generally only available in large state-owned enterprises, and ordinary people have never seen it.

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