please make me king

Chapter 843

"In fact, fine sand is also used to cast clay molds!" Zhang Dudu couldn't stand Zhang Shun's whimsical behavior, and couldn't help reminding, "Whether making cannon molds or gun cores, the surface is finely coated with fine sand, so Fire resistance!"

"Its gold and silver craftsmen use sand just to save trouble, and it is not a craft."

"To save trouble?" Zhang Shun couldn't help laughing when he heard the words, "Isn't it good to save trouble? Now how long does it take to make a clay model, and how long does it take to make a sand model?"

"It will take about a month from the start of work to the firing of the cannon. If it is cloudy or rainy, it will take longer!" Dudu Zhang replied honestly.

"Ah? So since you came here to now, how many cannons have you fired?" It turned out that Zhang Shun couldn't make cannons by himself before, so he made great efforts to develop wrought iron cannons, so he didn't know much about it. Familiar, did not expect to take so much time.

"Three and three furnaces, eleven doors!" Dudu Zhang shyly stretched out three fingers, and replied a little embarrassedly, "The first furnace opened three doors, and the result was three tests and three explosions; the second furnace opened six doors, There is no one who succeeds; just now two more doors were opened, this is another one."

Good guy, Zhang Shun didn't finish his complaints just after trying so much, when he suddenly remembered that this is a [-]-jin iron cannon, how could there be so much manpower and material resources for him to waste?
But on the other hand, he was able to smelt [-] jin of crude iron in these three months, which is also considered a good skill, right?

Thinking of this, Zhang Shun simply ordered: "In a while, let someone try that [-]-jin Hongyi cannon again. If it works, then it's fine; if it blows up again, you can honestly find some goldsmiths for me." , Ask them for advice on making sand models. We can’t just hang ourselves from a tree all the time, so we should try another way and see if it works!”

"Okay, then please avoid King Shun for a while, so as not to disturb you!" Dudu Zhang obediently agreed, and after reminding Zhang Shun a few words, he went away.

After a while, only a loud sound was heard.Zhang Shun shook his head helplessly, and sure enough, he exploded again.

As a veteran, he was used to the sound of artillery, so of course he could tell the difference between the sound of a normal cannon firing and the sound of a cannon exploding.

The former has a dull and powerful voice, while the latter has a loud and sharp voice, and the two are completely different.

Sure enough, after a while, Dudu Zhang ran back in a disheveled face, and honestly reported the results of the test firing to Zhang Shun.Zhang Shun thought for a while, and comforted him: "Victory and defeat are commonplace in military affairs, and there is nothing to be afraid of. It is just that we need to learn lessons from the failure process and improve in time."

"Let's go, follow me to take a look, and carefully analyze the reasons!"

Surrounded by the crowd, they came to the cannon test ground not long after, and sure enough there was another piece of iron on the ground, and everyone was picking it up there.

Zhang Shun randomly chose a piece, showed it to Dudu Zhang, and said, "Look at this piece of iron, it has many pits and holes, it's extremely rough, why not blow it up?"

Zhang Dudu took a closer look, and saw that the hole formed by one of the bubbles could fit his finger. He couldn't help but blushed and said: "This humble minister really did his best, but his ability is limited."

"Don't say that!" Zhang Shun waved his hand, interrupted Zhang Dudu's words roughly, and shouted sharply, "Whether it's casting cannons or forging blunderbusses, what you talk about is the spirit of science, and what you use is exquisite craftsmanship!"

"If the workmanship is not as good as it is, you should dig to the bottom and find the root cause. How can you simply judge it by success or failure?"

"This ten-thousand-jin red barbarian cannon has never been cast by the Rebel Army. This new build is very difficult. How can we force it to succeed in one fell swoop?"

"I think so: We all use the Western modulus theory to cast cannons. This is the theory of cannon casting!"

"Secondly, determine its length, weight, caliber, charge and accessories, etc. This is the method of designing artillery."

"Third again, making models and pouring iron juice will take more than a month to complete. This is the method of casting cannons."

"Finally, the cannon is completed, pulled to an open place, loaded with powder and fired, and repeated several times. This is the method of experimentation."

"All four of these cannons are ready to be made. Manufactured according to the law, each time it is made, it can be used after passing the inspection, and the method of casting cannons is exhausted!"

"I don't know Mr. Zhang thinks that the casting of cannons can't be done right now, where is the mistake?"

After Zhang Shun's words, he divided the process of cannon casting into five stages: theory, design, technology, experiment and mass production. Zhang Dudu suddenly felt that his mind was much clearer.

He pondered for a moment, then tentatively replied: "Could it be between design and craftsmanship?"

"Is the modulus theory wrong?" Zhang Shun asked with a smile.

"The method of western modulus is better than that of China, it should be correct!" Dudu Zhang honestly admitted.

"Since the theory of modulus is correct, how can there be errors in the length, weight, caliber and charge of the gun designed by the method of modulus?"

"Uh, I think the casting must be wrong!" Zhang Dudu was dizzy, and his emotions were circling around. Do you mean that the problem is still on me?

"Why can't you find the right way?" Zhang Shun was asking Dudu Zhang, but he was also asking himself.

"I'm afraid it's because I'm too dull!" Come on, Zhang Dudu simply broke the can, and you insist on holding on to my mistakes?

Zhang Shun patted his head helplessly, this guy is good at everything, but he doesn't have the spirit of science, he always thinks about his ability and dignity.

He couldn't help reminding: "Ice melts and shrinks, water freezes and expands, and the cover is different from solid and liquid! Molten iron and iron must also shrink and expand differently, and it is not obvious when casting small pieces; when it comes to casting heavy cannons, there are problems. It will definitely appear, this one."

"When the molten iron is injected, there is a difference between the left and the right. The one injected first condenses, and the one injected later melts. The heat and cold are uneven, and the shrinkage and expansion are different, so there are many gaps; plus water vapor enters, there is nowhere to go out, so there are many bubbles and cavities. , the other is also."

"Molten iron is brittle if it is set quickly, and tough when it is set slowly.

"For all three of these, please explain in detail, the artillery will surely succeed!"

It turns out that in the process of questioning Dudu Zhang, Zhang Shun gradually cleared up his thoughts.

Originally, he thought that casting artillery was a high technology, but now that he thought about it carefully, it actually only involved basic physics knowledge such as solid-liquid conversion, thermal expansion and contraction.

Then, there are holes, bubbles and material issues in the cannon, and it also involves steel technology issues, which are basically within the scope of Zhang Shun's understanding, so there are such remarks.

However, these remarks have no logical relationship with the previous sand casting.It's just that Zhang Shun suddenly had a burst of inspiration, and he said what he thought of, trying to use the physics knowledge he learned in his previous life to analyze the principles.

But Dudu Zhang was also dumbfounded when he heard it, which kind of meant "though he didn't know it, he felt serious".

He subconsciously regarded this sand casting as a solution to these problems, and was going to implement it immediately.

Under these blunders, Zhang Dudu's blind cat bumped into a dead mouse.

It turns out that mud cast cannons were used for hundreds of years in history, and were eventually replaced by more advanced sand casting.

The most important reason is that sand casting has good air permeability, is not easy to produce holes and gaps, and the shaping effect is better than mud casting.

Even before Zhang Shun passed through in his previous life, many modern factories were still using this technique to cast large metal components.

This technique is much stronger than the "iron mold casting method" that Zhang Shun remembers, both in terms of practicability and scope of application.

(End of this chapter)