Vol 6 Chapter 2760: The Science of Bullets【A】

Seeing the surprised looks of the two, Wu Hao explained with a smile: "Because most of the weight of the bullet is actually concentrated on the shell and the propellant, the real bullet is actually very light, and the size of the bullet is also very small. , so when the size of the magazine is similar, it can be loaded more than traditional bullets.

Take the 5.8mm small-caliber rifle ammunition commonly used in our country as a distance. The weight of the entire bullet is 12.5 grams. Among them, the weight of the shell case is 6.25 grams, while the weight of the warhead is only 4.15 grams. The rest is Launch the desired weight.

The weight of the bullet is equivalent to one-third of the regular bullet, that is to say, the weight of the three bullets reaches the weight of a traditional bullet.

The weight of the warhead we use is actually about the same, and may even be lighter, only about 3.9 grams. In this way, based on the 30-round capacity of the traditional rifle magazine, the 30 rounds of bullets in the traditional magazine are 375 grams, and the weight of an ordinary magazine is about 300 grams. If you use plastic The magazine will be lighter, so the weight of the full magazine may reach about 600 grams to 700 grams.

Our bullets are only 3.9 grams. Based on the capacity of 120 rounds of bullets, the weight of all bullets is only 468 grams. The weight of our magazine is relatively similar to that of traditional magazines, based on 300 grams, no, calculated based on 400 grams, the total weight of this magazine is less than one kilogram. You know, the weight of the full magazine of the traditional five-six-type submachine gun, which is commonly known as AK47, has reached more than 900 grams, which is close to one kilogram. Our full magazine is not as heavy as it is, but our ammunition capacity is as high as 120 rounds. What kind of level is this? "

Speaking of this, Wu Hao glanced at the two, and then continued to explain: "In addition to the light weight, the bullet head of our bullet has a simple structure. Its overall structure is composed of two parts, namely the outermost steel shell and the outermost steel shell. And the lead core inside is composed of two parts.

The reason for this design is that electromagnetic weapons need to be driven by magnetic force, and iron shells are more likely to feel magnetic force. As for why lead is added in it, the main reason is that the warhead can deform when designing objects, thereby increasing the lethality of the warhead.

If all the warheads are made of steel, although the penetrating power will be greatly improved, the lethality of the warhead will be very small. This may be like the 38 cover of the little devil back then. The bullet pierced a hole in the body, but the person is not a big deal.

That's why we filled the steel warhead casing with lead, and carved preset cracks in the steel bullet casing. When the warhead concentrates on an object, it will be deformed under the action of a huge stopping force, the steel shell will crack, and the lead core inside will explode, causing huge trauma in the object.

So don't look at its small warhead, but in fact it is relatively powerful.

In addition, the cost of lead-filled warheads made of steel shells is also cheaper, not only saving the material cost of coating copper, but also saving the cost of shell casings and propellants. In addition to these, its manufacturing process is also much cheaper than traditional bullets, because it only needs to produce this kind of bullet, instead of the complicated whole process of producing a regular bullet. "

The reason why traditional bullets are not suitable for steel bullets is that steel bullets will have a huge friction force on the barrel rifling, which will seriously damage the rifling inside the barrel. In addition, due to the characteristics of the material, the ductility of the steel bullet is not strong, so there is no way to fit the rifling, and the airtightness is not strong, so there will be air leakage when firing, which will cause the inside of the bullet case to leak. The kinetic energy of the ammunition is not fully applied to the warhead, which seriously affects the range of the bullet, including the trajectory.

And won't your electromagnetic gun be affected by this aspect? At this time, Pang Zhengqing raised his own question, which was also a question he was more confused about.

You must know that our country is a country that is seriously deficient in copper, and for a long time in our country's history, copper has been circulated in the market as the main casting material for currency, so it is actually a precious metal in our country, but relatively It's just cheaper.

And for a long time in history, copper will also be used as various ritual vessels, wine vessels, and display vessels. In modern times, copper has played a huge role in economic construction, scientific research, and industrial manufacturing.

Therefore, the copper shortage in our country has been in a state of tension for a long time. At that time, in order to reduce the cost of bullets and reduce the crisis of copper shortage, our military scientific research personnel began to improve the bullets. One of the important methods was to replace copper materials with other materials.

Among them, steel was the first to be selected, so soon, our iron-cased bullets appeared. The bullet casings of the bullets changed from the original pure copper, UU Reading www.uukanshu.com to steel bullet casings. We saved a lot of copper material, and also reduced the manufacturing cost of bullets.

Even the researchers once hoped to change the bullet to a steel bullet, but after a series of experiments, it was found that the steel bullet has a very fatal flaw.

And these defects all come from the advantages or strengths of steel itself, that is, its hardness is too high. The ductility of the steel bullet case is not strong, so that the bullet case cannot fit tightly with the barrel, especially when the bullet is fired, the eggshell without ductility cannot be sealed with the barrel case, resulting in the The ability can't focus forward on the bullet, thus losing a lot of thrust, which will cause the bullet's range to be greatly affected, which is much shorter than the copper case bullet. Because the bullet has a long range, the ballistic trajectory will become not straight enough within the effective range, which will greatly affect the shooting accuracy of the bullet.

In addition, the friction coefficient of copper is much smaller than that of steel, and it is a very widely used metal "lubricant". Therefore, copper shells are easier to withdraw and withdraw, while steel shells are easy to jam, affecting continuous shooting.

Finally, copper has better thermal conductivity. We can see that the heat sinks of many electronic devices are made of copper materials. The bullet uses a copper shell, which will absorb a lot of heat in the barrel when the shell is drawn out, thereby delaying the temperature rise in the barrel, which is conducive to continuous shooting. Otherwise, the temperature of the barrel is too high, and it is easy to misfire or even explode the barrel.

Of course, this problem is not too serious in the end, so after continuous exploration by technicians, copper-plated steel shells can increase its lubricity and reduce jamming.

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