showdown!I enjoy life on the island

"Wait for Xu Shenxiu to show his face!"

"..."

……

After the iron core cooled, Xu Le continued to smelt copper ore.

The corresponding mold is also made.

This is a 1.5-meter-long sand box, and the size of the model dug out of it is a circle thicker than the iron core.

At the same time, the lower half of the model is closed, which leads to the fact that if the workpiece is cast from it, the tail will open to one side.

This also provides the possibility of backfilling.

The copper ore has a low melting temperature and quickly turns into hot copper liquid, which is injected into the mold.

In addition, there are some fragmentary workpieces, and Xu Le also made molds one by one to complete the casting.

Lin Xihan helped Xu Le move the ore, and at the same time, in his head, he imagined how it would look assembled based on the workpieces made by Xu Le.

She was surprised to find that all these castings could fit together perfectly, leaving no dead ends and no redundancy.

The most important thing is that she didn't realize until now that during the whole processing process, Xu Le just raised her hand.

No drawings!

If it is a workpiece that does not require precision, it is purely free to play without drawings.

The problem is not big.

But stacking multiple workpieces like this, especially large workpieces, is unimaginable without drawings.

Recall that Xu Le processed wooden cows, horses or other objects before.

Or simply, when building the suspended second floor, there were no drawings.

I was so slow-witted... No, it wasn't that I was slow-witted, it was that I didn't realize it at all.

It's not my fault, I haven't been in a workshop before... She arrogantly attributed her surprise at the moment to her lack of careful observation.

soon.

The original cast iron core, that is, the two sections of the iron barrel, has cooled.

Break open the sand box, take out the workpiece, and clean up the floating sand.

A seventy-centimeter-long iron barrel, and a thirty-centimeter-long rear part of the barrel, appeared between the grains of sand.

Neither the long tube nor the short tube goes straight up and down.

The tail of the long tube swells slightly, while the top of the short tube converges a few centimeters inward.

This allows the tail of the long tube to wrap around the top of the short tube when the two workpieces are docked.

Xu Le looked at the interface close to his eyes for a while, and said:

"Well, a little adjustment is needed to ensure that the interfaces can be wedged together."

He reheated the barrel, then swung the hammer and forged it continuously!

While forging, use [Stress Science] to feel the force feedback of the hammer.

Resilient muscles perfectly control the rhythm of the exercise.

The shapes of the two gun barrels are changing very slightly towards a nearly perfect match.

Ding!Ding!Ding!

The sound of iron striking is crisp and pleasant!

Not long after, the forging ended.

After the barrels cooled down again, Xu Le held the long barrel with his left hand and the short barrel with his right hand, and connected the two barrels to each other.

The butt joints fit perfectly!

()showdown!I enjoy life on the island

Chapter 392 Assembly Completed

After the iron core of the gun barrel is cast, the cooling of the copper skin is also initially completed.

The tall sand box was directly broken, and the copper workpiece inside rolled out.

The length of the workpiece is about 1.1 meters, and the whole body is blue.

During the smelting process, Xu Le deliberately increased the content of impurities such as lead and tin in the copper through the [Metal Proficiency] skill.

Bronze obtained by smelting is wear-resistant and hard.

Has fairly good strength.

It's just... when he cleaned up the molding sand on the bronze cannon skin and put it together with the two separated iron cores.

The caliber gap between the inner and outer core skins is obvious.

It's too thick to get in...

It's not that the thicker the one to go in, the better.

Xu Le flicked the barrel of the gun with his fingers, and raised his eyebrows.

Just as he was about to continue processing, Lin Xihan came over.

"The outer diameter of the iron core is larger than the bronze skin, does it need to be polished?

"No... After rough grinding, will the surface accuracy not be guaranteed?"

Metal workpieces are joined to each other, and a slight size gap may cause installation failure.

What's more, things like cannons have quite high requirements for precision.

The island does not currently have the basic tools needed for fine grinding.

This also means that if only rough grinding is performed, gaps or even holes may remain on the joint surface of the copper skin and the iron core.

And even the tiniest trachoma may cause the chamber to explode when fired.

"Why grinding? No grinding, the size of the gun barrel is just right now."

It's not like you can't get in if you're thick, so why be so nervous?

This thing is tricky, take it easy and don't be afraid.

With a big wave of his hand, Master Xu picked up the bronze skin with iron tongs.

He climbed up the steps set up beside the ventilation stove, carried the copper sheet into the fire with one hand, and continued to heat it.

The weight of a hundred or so catties is like playing with him in his hands.

This is good when you have more strength, and you don't need to use other tools to support large workpieces at all...

If I were still at the level of ordinary people's strength, I'm afraid I would have to set up a shelf in the workshop...

Trouble is not trouble, but a waste of time.

The heat of the fire was overwhelming, and the temperature of the bronze cannon skin rose rapidly, tending to gradually turn into a red-hot state.

After continuing to heat the cannon skin until it was completely red hot, Xu Le took it out of the stove.

"Help put the long barrel on the anvil and stabilize it."

Lin Xihan arranged it as she said.

Xu Le aimed the cannon skin at the cannon core, bit by bit.

The inner diameter of the copper skin, which was originally slightly narrower than the iron core, can fit just right after being heated and expanded.

Xu Le's hands were extremely steady, and the heavy cannon skin slowly wrapped the iron core.

He lightly tapped the tail of the bronze cannon skin with a hammer to help join the two workpieces inside and outside.

The image of the iron core gradually sinking into the copper skin... I always feel that it is not suitable to be released in the live broadcast room.

Ding!Ding!Ding!

With a series of crisp sounds echoing in the workshop, the copper-skinned iron core fit perfectly.

As the temperature of the copper skin drops, there is no longer any gap between the inner and outer gun barrels.

Xu Le wiped his hot sweat and patted the gun barrel: "The principle of thermal expansion and cold contraction is simple."

Barrage in the live broadcast room——

"Just perfect!"

"Using thermal expansion to increase the inner diameter, it can be naturally joined together after cooling, and it is extremely strong!"

"Even in modern industry, this craft is still very active!"

"But in fact, this kind of processing technology has very strict requirements on precision!"

"Yes, it is necessary to consider both the thermal expansion coefficient and the ductility of the workpiece material."

"Xu Shen is so relaxed, I thought it would be fine to mess around."

"Hehe, do it casually? Do it casually, or you won't be able to get in, or it's too loose, or it will burst if you go in!"

"The dimensions of the inner and outer diameters and the performance of the metal are all precisely calculated!"

"Xu Shen... so terrifying."

"And Brother Chest, did you notice that Xu Shen lifted such a heavy barrel with one hand!"

"Hehe, is it strange? Xu Shen's personal strength is also unfathomable!"

"A person who can wield a Mo knife is a weak and powerless person?"

"Set a small goal for yourself to exercise, first carry him a hundred catties with one hand!"

"..."

……

The main body of the cannon is finished.

The copper-clad iron barrel has the narrowest diameter at the muzzle, and gradually thickens from the middle.

There is a large slot in the belly of the gun about seventy centimeters away from the muzzle.

The size of the large slot is just enough to accommodate the [-]cm short barrel, which is the sub-cannon.

On both sides of the large slot, there are "ears" used to fix the gun body, and at the tail of the gun body, there is also a rudder stock used to adjust the direction.

This is also a reduced version of the artillery, but under Xu Le's high-precision processing, its power cannot be underestimated.

Inside the sub-cannon, gunpowder and projectiles can be filled in order in advance and compacted.

The projectile was made by Xu Le on the spur of the moment. It was slightly smaller than an egg, and it was extremely heavy to hold.

The structure of sub-cannon + gunpowder + projectile can be prepared in advance in large quantities, and can be replaced as needed.

To launch, you only need to install the sub-cannon into the belly of the gun through the large slot, and clamp it with a clip, and the entire inner tube will become a whole again.

Light it up and enjoy the fireworks.

The original defect of the breech-loading Francophone is air tightness.

If the processing accuracy is not enough, the sub-cannon in the second half of the gun will easily have too large a tolerance with the belly of the gun.

When firing, a large amount of expanding gunpowder gas bursts out, pushing the projectile while also pushing the sub-cannon in reverse.

At the junction of the inner tubes at both ends, a gap that cannot be ignored will be exposed.

When the gas passes through the seam, most of it will leak along the pores, resulting in a serious lack of power for the ammunition.

The power of the ammunition is insufficient, so the initial speed is naturally greatly reduced, and the follow-up will be weak after flying a hundred or so meters.

How much lethality can be left depends entirely on God's will.

This is also the price to pay for increasing the rate of fire.

Low EQ: At the beginning, the wind was ten feet high, but now the wind is damp and the shoes are wet.

High EQ: Leeks are on sale in the vegetable market today.