Da Qin: At the age of six, I beat Qin Shihuang at the beginning

Chapter 257 Asbestos
In fact, just now, Qin Mu had doubts.After all, the problems with the rails just now are basically concentrated in two places.

To cause this situation, either the craftsmen have some bad habits in operation, or there is a problem with the mold.Just now, he asked one of the craftsmen to demonstrate, but there was no problem.Therefore, probably Lu is the problem of the mold.

Qin Mu motioned to the craftsman: "From here, break open this mold."

The craftsman looked at him in surprise: "My lord, this mold...it took us to make many trials before it was made...if you smash it directly, I'm afraid...if you want to make another one, it will take a lot of time... ..."

Qin Mu did not hesitate at all, and directly asked him to smash it.The craftsman looked at Wei Yu with a look of embarrassment on his face.

They are all old craftsmen. In fact, they have suspected that this is a problem with the mold before.After all, all the errors appear in similar positions, and their own craftsmanship is fine, so the problem is naturally the mold.

However, the production of molds is too difficult after all!Such a mold is not easy to make!Under normal circumstances, bronze forehead molds are directly dug in the ground, and then the pit wall is tamped, and the corresponding lines are directly engraved or painted on the pressed hard pit wall.

Based on this production method, the outer wall of the bronze ware may have various patterns of different patterns, while the inner wall is often bare, without anything.

The Royal Workshop originally wanted to adopt this method, but... the bronzes may be large, but the rails... are too thin!Thin and long, it is impossible to make such a mold by digging a hole.

The craftsmen in the workshop were forced to use clay molds that had been trial-produced on a small scale before.However, this kind of mold has only been used to make some smaller bronzes before, similar to small utensils such as wine bottles. It only needs to be pinched with bare hands and then fired.Anyway, it's just a small thing, even if it is slightly deformed, it doesn't matter, as long as it is not bad.

But for rails... it's a different thing altogether.This thing is too thin and too long... The clay itself is not hard, once it is too long, it will easily collapse.Even if it is kneaded into shape at the fastest speed, before it collapses and is sent to the oven, the deformation during the firing process is beyond human control.

In addition, the requirements for the accuracy of the rails are too high, and the error must be controlled at about 200 millimeters. For the current technology, it is really too embarrassing.Even the craftsmen of the Royal Workshop worked day and night for a long time, making more than [-] molds, and finally managed to pick out a dozen usable ones.

So, it's not that they never guessed that the problem lies in the mold, but, even if they really knew, they would not be willing to smash the mold that they worked so hard to make... It's broken, and I don't know how long it will take In order to make qualified things!

The railroad tracks are in such a hurry, even if there are no problems now, it will be very difficult to deliver the work on time.Then destroy the mold... Then everyone just wait to wipe their necks!

The criminal law of the Great Qin Dynasty is there, and the task is assigned to you. It must be completed.Although Wei Yu was born as a craftsman, he wasn't usually considered harsh, but he was from Daqin after all, and was deeply influenced by the environment. All he could do was to give suitable tasks according to his personal ability.

As for those punishments, in his heart, isn't it reasonable to be punished for failing to complete the task?

Although the craftsmen complained, they could not blame him.It's very simple, people are bad and people are good, it's out of comparison.In fact, Daqin is like this. If you change someone, you will only be stricter than Wei Yu. Wei Yu will only let you do coolies. If you change someone, you may be beheaded...

Wei Yu was worried about the craftsman's heart, he thought for a while, and said to Qin Mu: "Young master, making this mold is really troublesome... Besides, this mold is related to the progress of the future, if it is really smashed, I am afraid it will be even worse." Marfa..."

Qin Mu glanced at him, and pointed to the abandoned railroad tracks in that place: "Look for yourself, in this situation, didn't you guess that it was a problem with the mold? Since there is a problem with the mold, of course it has to be replaced! That's how you do it." Can you finish it if you drag it on?"

Wei Yu also looked helpless.In fact, such a railway track is not impossible to handle, after all, it is wider, not narrower.In the wide place, it is a big deal to use a scorpion to grind it off.Although the strength is not as good as the complete one, it can be used anyway.

However, Qin Mu insisted, he had no choice but to turn around and let the craftsman break it into pieces.

When the clay shattered to the ground, Qin Mu also saw the problem.The inside of the clay mold should have been bumped, so a groove appeared. It is precisely because of the groove that the rails cast by this mold will have a wide width.

"Sure enough, it's the problem with the mold... The other one, in fact, should be almost the same." Qin Mu picked up the broken pottery on the ground: "The mold made of this clay is really too brittle! If you touch it a little, it will easily change." It's like this! Although the others can still be used now, but... it should be a matter of time if something goes wrong!"

Wei Yu's expression was a little helpless. He knew about this matter, but there was really nothing he could do!Otherwise, you can't even make the most basic molds, you can only stare blankly!

"The best way is to change the material of the mold. This kind of thing will definitely not last for a long time!" Qin Mu thought for a while, then looked at Wei Yu: "How do you usually make molds?"

Wei Yu began to explain that in this era, molds were rarely used. Most of them just dug holes in the bottom to make patterns, and then poured molten iron or copper into them.

Qin Mu pondered for a moment: "Let me tell you that Yizhong material should be a good material for making molds. This material is very heat-resistant, not easy to deform, and it is not difficult to make. But, after all, it is made of rails, it is best to use Change a few more molds, so as to reduce the error."

As he spoke, he asked Wei Yu to find a piece of paper and began to write and draw on it.During this period of time, he also learned some small seal characters, and he was able to write simple things.

What he gave Wei Yu was the asbestos production method of later generations.There is nothing particularly good in this era, only asbestos is good, and the production is not difficult and the cost is low.

He's done it many times before.The mold used for casting is just right.

(End of this chapter)