Seeing this, Li Xiang couldn't help but feel a little disappointed, thinking that this kind of child would have to sleep for half a year before waking up, and it seemed that the next sowing would really have to wait until next spring. Pen | fun | pavilion www. ｂｉｑｕｇｅ。 info was thinking like this, suddenly someone knocked on the door outside, Li Xiang opened the door and saw that it was Yuru, and he also held a booklet that had just been copied, which was the knowledge of metal smelting.

Li Xiang let Yuru into the room, and was about to open the booklet to take a closer look, but heard Yuru ask, "That piece of Jinpa...... Did Sister Bing Xue give it to you? ”

Li Xiang was taken aback and couldn't help blurting out: "How do you know!?" ”

Yuru said: "Fools can't see it, the words on that brocade are exactly the same as the handwriting on the booklet that Sister Bing Xue gave you today, and you can tell at a glance that it is from the same person." "Lee

Xiang was shocked when he heard it, but after thinking about it, he felt that it was nothing, and he had a deep affection for Shiya, if he explained too much on this matter, he would seem to be empty-hearted, so he smiled and said: "Isn't it just a Jinpa, I'll explain this matter to Shiya when I go back." ”

Yuru saw that he said easily, and said with a smile: "Actually, Sister Shiya is not the kind of person who is cautious, but she needs to explain more to Sister Bingxue." ”

Three refractive telescopes have already been made, the telescope is a monocular orthographic mirror, the lens barrel is made of copper casting, and there is a simple rack and pinion focusing mechanism, although it is not as good as the bird-watching glasses or large magnification amateur telescopes of later generations, but in the case of a good field of vision, it has been able to see the figure more than 30 miles away clearly. After Lu Wenxin got these three telescopes, he was full of praise for them, and regarded them as the most important treasures and sent someone to keep them properly.

At this time, Dong Huai, the waiter of the Ministry of Works, finally had news coming.

Dong Huai couldn't hide the excitement on his face, and hurriedly stepped forward to open the box, Li Xiang leaned over to take a look, only to see that there were more than a dozen iron bars in the box, these iron bars were more than ten centimeters long, finger-like thick wires, and they were placed together, in addition, there were two daggers that had been formed.

Dong Huai took out one of the daggers and said, "Lord Li, you see, this dagger is obtained by high-temperature tempering according to the method that Lord Li said. The specific method is to reheat the quenched dagger to the temperature that adults say, and then cool it naturally in the air, at this time the obtained blade has enough toughness, and then after local quenching, the rigidity of the blade part is not reduced at all. ”

As he spoke, Dong Huai took out another dagger and said: "The quenching and tempering treatment of this dagger is based on the previous method, but the toughness is much worse than the previous one." However, the steel used in these two daggers is exactly what you are talking about, and the iron is made from coke, then forged many times, and finally carburized. However, we have not yet fully mastered this carburizing method, this time in the trial production, because the design of the hyperbaric chamber is somewhat unreasonable, it has exploded many times, but now we have found another solution, which can avoid the recurrence of similar accidents. ”

When Li Xiang heard this, he understood that what Dong Huai said was that the iron ingots were forged and formed, and then quenched to increase the hardness, and then tempered to improve their toughness. According to Li Xiang's requirements, the tempering temperature should be controlled at about 250 degrees, but he didn't know how to describe this temperature for a while, so he only wrote a rough idea in the booklet at that time, only to let the workers grasp it themselves in the specific operation, as for the final carburizing treatment, it is a way to improve the surface hardness, Dong Huai knows the purpose of this process.

Modern carburizing methods are more complicated, such as gas carburizing to monitor oxygen concentration, carbon concentration and other indicators, which is obviously impossible to do under the current conditions, so Li Xiang just referred to the encyclopedia to design a simple tubular carburizing furnace, he also didn't know if it could work, but Dong Huai asked the craftsmen under the Ministry of Industry to try it himself, and now listening to Dong Huai say this, he knew that this carburizing equipment had worked, and couldn't help but be overjoyed, and hurriedly asked: "How are these two daggers compared to General Shi's?" ”

Dong Huai smiled a little embarrassedly, and said: "Actually, we have also tried, the most direct way to test the knife is to cut it in pairs, but General Shi is reluctant to try it with the blade, so we collide with the back of the knife, but now these two daggers are still far from General Shi's, but they are not much different from those Damascus sabers." Speaking of this, Dong Huai showed a smug look again.

In fact, real Damascus steel, also known as crystalline pattern steel, is a perfect combination of ancient powder metallurgy and forging technology. Damascus sabers usually have wavy patterns, these patterns are not engraved later, but two materials with different properties, the bright place is pure snow charcoal iron, its hardness is greater than glass, and the structure of the dark place is Vostian iron and Bolai iron, and the toughness is excellent, which makes the Damascus saber not only have an unusually sharp blade, but also have a tough and difficult to break the blade. Li Xiang also looked at this kind of steel knife and steel carefully when he consulted the chapter of metallurgical history around the world, and naturally knew that this kind of saber was powerful, and now Dong Huai has been able to reach this level, and it is really not easy.

Li Xiang was very happy at this time, and couldn't help asking: "In addition to making daggers in the past few months, Lord Dong must have gained another harvest, I don't know what other good news there is?" ”

Dong Huai hurriedly said: "In fact, these two daggers are made entirely to verify the texture of the steel, not to make daggers specifically. As he spoke, he took out a few strips of iron from the box, and said: "Lord Li, please see, this is the turning knife you are talking about, and the two knives in the hands of the lower official are rough turning knives, and the production method of this knife is: first the iron pier is forged and formed, and the carburizing process is carried out, and then the front part is clamped with steel, and then the basic shape of the knife edge is ground out with sandstone, and then the knife edge is finely grinded, and finally the quenching and tempering treatment is carried out, and now these knives can easily cut off the skin of ordinary iron materials. I have carried out many tests with Mr. Hu of the iron factory, if the cutting force is uniform, and a cutting is not too thick, there is basically no damage to the knife edge, but this batch of tools is extremely time-consuming to make, not only the knife edge needs to go through multiple processes processing, and the cutter body must also be strengthened, otherwise if there is bending, it will affect the accuracy, and it is not easy to be fixed by the fixture, which will make the capacity error when making the workpiece. ”

Li Xiang heard that the knives had also been produced, and he couldn't help but be overjoyed. In fact, the cutter is mainly divided into cylindrical turning tools, cutting knives, thread knives, inner hole knives, round head knives, etc., Dong Huai is holding several cylindrical knives at this time, and the turning tools can be divided into integral cutters, welding tools and machine clamping tools according to the structure, because welding can obviously not be realized at this time, so most of the current cutters are integral cutters, but looking at the appearance of this turning tool, it is obvious that it can be flexibly disassembled. (To be continued.) )