The first and third steps of casting are simple, but the second step is to make the mold.

Wang Qi also prepared the whole sand mold, mud mold, or metal mold at the earliest, but the melting point of 304 stainless steel is more than 1,400 degrees, which is about the same as molten iron. The melting point higher than iron is chromium (1857 °C), zirconium (1852 °C), platinum (1772 °C), titanium (1668 °C) and other rare metals. Let's not talk about whether he can get these rare metals, even if he can, make these rare metals with high melting point and high hardness into a warhead-shaped mold, and he can only scratch blind without high-precision machine tools.

Therefore, Wang Qi directly abandoned the traditional casting material, and replaced it with a brand-new, unique and unique casting material in the world:

Space Membrane!

This is what Wang Qi thought of at once inspired by the space membrane gun barrel.

Even if the temperature of the metal is high, even if it is vaporized into plasma, it cannot have the slightest impact on the space film, so that it has the slightest deformation, so that the cooled casting can always maintain considerable accuracy.

Not only that, the separation of the casting mold formed by the space mold from the casting is only a matter of Wang Qi's thoughts, and it will never have any adhesion to the casting like the traditional casting mold, which will affect the accuracy.

The shape of Barrett's ordinary armor-piercing warhead is not complicated, it is a cone with a sharp front and a round back, of course, not a pure cone, but a cone plus a small cylinder, and the part where the cone and the cylinder meet, forming a smooth transition.

So, in fact, strictly speaking, the geometry of the bullet should be made up of three parts: the cone, the cylinder, plus a small section of the overbody connecting the cone and the cylinder, a more complex surface body.

Now Wang Qi has been able to use consciousness to drive the space membrane and form a variety of geometric patterns, such as:

A one-dimensional "line": a line segment or curve;

Two-dimensional "shapes": such as squares, rectangles, circles, triangles, ellipses, etc.;

Three-dimensional "bodies": such as cubes, cuboids, cylinders, spheres, cones, triangular pyramids, quadrangular pyramids, pentagonal pyramids......

The length and size of these lines, shapes, and volumes can be precisely adjusted by adjusting the parameters of the "Precision Column".

In a word, as long as Wang Qi has seen in reality, objects that can be drawn on paper with a pen, and objects that can be accurately summarized and described with parameters, he can use consciousness to drive the space membrane in the cube, so that the space membrane can curl and deform, and simulate the shape of objects in reality.

By looking for pictures of Barrett's warhead on the Internet and querying the parameters of the warhead, Wang Qi began to use consciousness to curl and deform the space film in the "laboratory" to make a casting mold.

The cone in front of the armor-piercing warhead and a small cylinder behind it are very simple, and the diameter of the warhead is the inner diameter of the barrel, 12.7mm, but Wang Qi deliberately made the diameter of the mold 5mm larger than the inner diameter of the barrel, set to 13.2mm, because of the thermal expansion and contraction, after the liquid warhead is cooled, the volume will be 3%-5% to shrink, and this shrinkage needs to be taken into account.

The diameter of the warhead casting mold is 13.2mm, the overall length is 57.2mm, still taking into account the problem of thermal expansion and cold contraction, Wang Qi corrected it to 59.5mm, the length of the cylinder behind, Wang Qi takes 20.0mm long, the three parameters are fixed, the shape of the whole object is fixed and unique, a thought in the mind, "ding", a hollow casting mold formed by the curling of the space membrane is formed.

Wang Qi took a look, and immediately felt that the whole bullet casting was by no means the Barrett armor-piercing bullet warhead he had seen in the Internet pictures, and there was a lack of smoothness and natural transition between the front cone and the rear cylinder, which looked like a miniature version of the wooden spinning top he had sharpened with a kitchen knife when he was a child, and it was ugly.

The shape of the warhead is actually not complicated, the transitional surface, Wang Qi believes that there should be a parameter or equation that can be input into the cube, so that the cube can be formed in one step, just like the CNC machine operator sets the parameters for the CNC machine to automatically cut and process complex surface parts.

To a certain extent, Wang Qi's cube is equivalent to a universal CNC machine tool, but he is not an operator, his knowledge and talent are limited, and he can only play a small part of the cube's functions at present.

But this can't be blamed on him, his mathematical knowledge is only up to high school, their business and trade department does not open advanced mathematics at all, and he has never touched a CNC machine tool in reality, so he has eight tricks on how to cut complex parts, and he doesn't know anything!

However, it doesn't matter, you can't take a shortcut, use the soil method of an iron pestle and a needle, like the ancient mirror grinder, use water grinding work, and use consciousness to slowly polish and correct the casting of this semi-finished warhead, and "cut off" the excess part of the cylinder by deforming the space film bit by bit, so that it can finally get close to the true appearance of Barrett's armor-piercing bullet, and he can still achieve his intended goal.

Because it was the first time to engage in this kind of water grinding work, he was inexperienced and unskilled, so Wang Qi spent a whole night, like an eighth-level lathe worker using an antique lathe to turn high-precision parts, grinding and measuring at the same time, and finally made the sniper warhead with a diameter of 13.2mm and a length of 59.5mm long tend to be perfect.

The work of casting the warhead is more than half completed.

The next thing is simple, Wang Qi used his consciousness to melt two stainless steel pipes into a small grapefruit-sized molten steel ball at a high temperature of 1500 degrees Celsius, cut out a drop of about 50 grams of stainless steel water, and poured it into the warhead casting.

In order to completely fill the space membrane casting mold with molten steel, Wang Qi also needs to use a little means.

In the real world, there are two types of casting: gravity casting and pressure casting.

As the name suggests, gravity casting is to let the liquid metal flow naturally into the mold under the action of gravity.

Pressure casting is divided into vacuum casting and high-pressure casting.

There is no gravity in Wang Qi's cube, so gravity casting is not used at all.

However, he can easily form a high-pressure environment with a maximum pressure of 400 atmospheres in the cube, and can completely pour molten steel, which is thicker than honey, into the mold formed by the space membrane.

Pour, pressurize, and then scrape off the excess molten steel from the bottom of the warhead with a utility knife.

In the end, Wang Qi used his consciousness to transfer the warhead, along with the space film casting, into a space with room temperature and pressure and zero humidity that had been prepared for him a long time ago, so that it could cool down naturally and cool down naturally.

This is the most complicated process and the most cumbersome steps he has ever done, which makes him feel the most troublesome.

In the process of waiting for the red-hot warhead to cool down naturally, Wang Qi was like a pregnant woman who was ten months pregnant, scratching her ears and cheeks, restless, and feeling for a while that the warhead that had wasted his boss's nose might fail to be cast, for example, the shape would be irregular after cooling, and there might be defects such as trachoma and bubbles inside the warhead during the cooling process, which would affect the center of gravity of the warhead and lead to poor shooting accuracy.

After a while, he scolded himself for being an idiot, and said to himself that the entire casting process was made in a sterile, dust-free, air-free zero-gravity environment, which was several orders of magnitude cleaner than the cleanliness of IMB's chip manufacturing workshop, with hairy bubbles and trachoma?

Thinking about it like this, he couldn't help but get proud, and felt that although the traditional casting parts have defects, such as low precision, most of the castings have burrs, and many of them need secondary processing and secondary polishing, but his current casting is not casting in the traditional sense after all, not to mention the others, just sterile, dust-free and air-free and zero-gravity environment, it is not what the traditional foundry on the earth can provide, let alone the unique, indestructible, and never deformed space film casting.

"Hehe, maybe the warhead summoned from the cube will be completely superior to the warhead made by the traditional bullet assembly line, and it will be close to the high-precision warhead processed by machine tools by foreign firearms enthusiasts!" Wang Qi smiled "hehe", and looked forward to the warhead that was about to be baked.

In order to make the bullet cool and cold, Wang Qi restrained his desire to summon it immediately, and waited for about twenty minutes, until in his line of sight, the warhead wrapped in the transparent space film completely lost its red color and turned back to the cold white of stainless steel, he took a deep breath, stared at the center of the stainless steel lunch box that was specially taken out to receive the bullet, and shouted softly:

"Come out, my little girl!"