In fact, graphitization annealing is not a high-tech, in ancient times, there were examples of casting agricultural tools with white iron, and then annealing to obtain high-quality cast iron agricultural tools; During the War of Resistance Against Japanese Aggression, the Eighth Route Army also adopted this method under difficult conditions, simmering hollow shell shells as a whole to strengthen the strength of the projectile body. Pen, fun, pavilion www. biquge。 infoUntil the modern development of the steel industry, this type of method was still used to make some parts and components at a lower cost than steel.

In the industry's parlance, graphitization annealing is to turn cast iron containing a large amount of cementite into malleable cast iron with good plasticity. Lin Weiye specially built a simmering furnace, which pushed the two barrels and shells and sealed them, and then heated them to about 950°C, and kept them for a period of time before cooling them properly. After the barrel has cooled completely, a horizontal hydraulic lathe similar to a barrel bore - but a large one - is used to cut and boring the barrel, so that the inner wall of the barrel is smoother and the caliber is more standard.

The diameter of the 12-pound mountain grenade is 117 mm, and the accuracy cannot be guaranteed when casting, so the thickness is reserved, and the cutting operation can thin the inner wall to the standard diameter. Because the material of the barrel is malleable cast iron at this time, not only the strength is greatly increased, but also the graphite is distributed in a flocculent shape, which has a lubricating effect on the knife, which not only has little wear on the tool, but also is very convenient to process. The shells can also be cut, making them more rounded and easier to fire.

After cutting, the barrel is completed, only the gun carriage and front trailer need to be installed, and it is a complete gun. Lin Weiye said to Xia Nan, "Report to the boss, the main part of the two test guns of the 12-pound mountain grenade is completed, with a caliber of 117 mm, a length of 0.96 meters, and a weight of 100 kg, please accept it." ”

Xia Nan looked at the smooth and smooth surface in front of him, comparable to the steel barrel, less than 1 meter in length, extremely light, very satisfied, and slapped Lin Weiye, "Lao Lin, you are so powerful, why don't you go to the sky?" Isn't the data of these cannons engraved in your head, the whole one-person computer! Don't tell me you teach this professionally. ”

Lin Weiye laughed twice, "Since I was in middle school, I have been fascinated by the battleships of the Sail Age and the weapons of the Napoleonic Era, and I often go to the forum to communicate and discuss with others, and the specific parameters of these well-known muskets and cannons are all memorized. Not only that, but we also discuss the necessary survival skills and money-making tools after crossing over in the forum, black powder, flintlock pistols and breech guns are all compulsory courses, in addition to that, I will also make soap and glass, can you believe it? ”

Xia Nan's eyes widened: "How boring do you science men have to be to study this?" By the way, you really know how to make soap? It wouldn't be such an exaggeration. ”

"Soap is actually very simple, that is, hardwood ash to obtain alkali, add animal fat, such as lard, and add some plant-derived flavors, after cooling, it is the original soap. The concentration of caustic soda is particular, and it is necessary to reach the level that the egg can float. However, in these years, animal fat is too expensive, and the cost of making soap is too high, and finally it has become a luxury product. Lin Weiye was full of interest, "In fact, we are located in Qiongzhou, and we have high-quality quartz sand, which can be considered for glass." Before the crossing, I had downloaded a full set of flat glass making methods, as well as how to blow glassware, give me some time, I will definitely be able to put the theory into practice, make glass, and open up new sources of money! ”

"Glass is a good product, it can be sold as a luxury product! Now the glass of the Ming Dynasty is all from Europe, the price is expensive, we have the advantage of transportation costs, we can shoot the Italians to death. Xia Nan pinched his chin and said, "But I still think you guys are really boring, you have nothing to study the crossing, now it's okay, it's really crossed, I'm not dragged down by you, right?" If you hadn't gotten into my car, I'd still be the CEO of my company! ”

Lin Weiye couldn't refute this remark, maybe he really affected others, people couldn't do it well, so they went to the Ming Dynasty to be a peasant entrepreneur, so they had to change the topic: "Ahem, this cannon is done, do you want to try it?" ”

Although he knew that the other party was changing the topic, Xia Nan was still successfully brought into the topic by him: "It's necessary, let's go, go and fight!" ”

Masturbate? The Chinese Chinese is broad and profound, this is a word with a very rich meaning, and Gao Fushuai and the otaku showed a slightly obscene smile at the same time.

The test guns were carried out at the firing range where the flintlock guns were tested. Since it was only the basic data for testing artillery, Lin Weiye did not choose the maximum firing range, but piled up a mound of earth two meters high and three meters wide at about 300 meters. The gun mount is on a temporary fixed gun mount, the barrel with the lug can be adjusted, and the gunner can be aimed with sights such as a crosshair and a light door.

Xia Nan asked Lin Weiye uncertainly: "It is said that artillerymen must understand ballistics and learn trigonometric functions, is this true?" ”

Lin Weiye snorted: "Only the ignorant brain-dead will have such thoughts." It is needed only when artillery develops to the stage of over-the-horizon attack and has modern sighting technology. The front-loading smoothbore cannon can only attack within the visual range of the naked eye, usually only a few hundred meters away, can it use bullshit trigonometry? Besides, cannons mainly use flat fire as a means of attack, with low ballistics, you know that ballistics are useful, howitzers and mortars are parabolic attacks, but they are all lucky, and the accuracy is miserable. There is no qualitative difference between the aiming of artillery and guns in this era, that is, it is to illuminate the door + crosshair, three points and one line, judge by the naked eye, and you can also use a simple quadrant to calculate the angle of the muzzle, in addition, even if you learn calculus, it is useless. ”

Xia Nan put his mind at ease, he was worried that it would be too difficult to train qualified artillerymen, but now it seems that it is very easy, and he can train good artillery by playing more artillery.

After aiming the muzzle of the cannon at the mound of earth, Lin Weiye briefly estimated the distance, then reduced the angle, stuffed the pre-loaded gunpowder bag from the muzzle, and then stuffed the solid bullet, compacted it with a through rod, pierced the gunpowder bag at the bottom of the barrel from the ignition hole, stuffed the fire rope, and then lit it, and took a few steps back.

The exposed part of the arquebus quickly burned out, and the spark drilled into the ignition hole, and a moment later, there was a loud noise in the barrel, and with a "boom", the shell flew out of the muzzle under the thrust of the gunpowder, flew to the target in a relatively straight trajectory, smashed two meters in front of the right side of the mound, stirred up a large cloud of dust, and then bounced up and continued to move forward, and after smashing twice on the ground, it sank into a patch of grass.

Although the onlookers have all been baptized with rifles and have a certain ability to withstand firearms, the prestige of the artillery is not comparable to that of rifles, and their faces turned pale.