Chapter 407: Printing robot

As we all know, metals exist in a chemical state in nature, that is, they form

so-called compounds.

Only those extremely inactive metals exist in the form of simple substances,

such as gold, silver, platinum, palladium... These precious metals are also

called inert metals because of their stable properties and difficult to react

with other substances.

Therefore, most of the metals that humans can obtain in nature are minerals in

the form of compounds, and new metal elements can only be obtained after

smelting.

However, a simple metal element has a single physical property, and in many

cases it cannot meet the needs of use.

For example, the well-known iron, in fact, the simple element of iron is very

soft, and only when it forms an iron-carbon alloy with carbon can it have a

hard texture.

Moreover, depending on the temperature, the lattice arrangement in the iron

crystal is also different. According to this physical property, the iron-

carbon alloy can be processed at different temperatures to obtain iron-carbon

alloys with different properties, that is, in the usual sense. What we

commonly call steel.

Mankind has a long history of using alloys. It can be traced back to the

Babylonians more than 6,000 years ago. They are the earliest known

civilization that began smelting bronze, that is, copper-tin alloy.

Yan country also began to use alloys a long time ago. In the Shang Dynasty

more than 3,000 years ago, the ancestors of Yan people had already smelted and

used bronze on a large scale, and even obtained sharpness through forging and

other processing methods. Sword.

The famous Yue Wang Goujian sword is still extremely sharp even thousands of

years later, and it can cut more than ten layers of paper with a single

stroke.

Therefore, in human life, alloys can be said to be everywhere.

But it is still very difficult to use 3D printing to print alloys.

First of all, theoretically, this can indeed be done, because the definition

of an alloy is a solid product with metallic properties obtained after a metal

and another or several metals or non-metals are mixed and melted and cooled

and solidified.

Therefore, using 3D printing to print alloys, in theory, only need to mix the

metal raw materials according to the required ratio, and then process them by

laser to obtain the desired alloy.

However, it is not easy to do this.

First of all, the mixing of metal powder must ensure that the overall ratio of

the raw materials for each sintering is very uniform, otherwise the metal

ratio will cause errors, and the printed material properties will also have

problems, which will destroy the overall structure of the printed product.

Before the disaster, Blue Star already had laser 3D printing technology, and

some people even printed a set of Iron Man armor out of titanium, its

performance can withstand rifle shooting.

But this is to spread the metal powder in a layer of only about 0.1mm or even

a few microns in a closed device, and then use a laser to sinter the area that

needs to be printed.

After repeated sintering layer by layer, the parts can be printed.

In this process, if there is air flow disturbance, it will directly blow away

the unsintered metal powder.

Aside from the interference caused by slow efficiency and air turbulence, it

is limited by harsh conditions, so it is difficult to print large parts, and

it is impossible to print alloys.

If it is only the sintering of powder particles that have been processed into

alloys, it is naturally very simple, but it is not that easy to process

different elementary metals into alloys.

Because there is a very important factor here is temperature.

Sintering is processing at a temperature slightly lower than the melting point

of the material to bond the powder particles. However, if you want to process

different elementary materials into alloys, it is obviously impossible to rely

on sintering alone, but the material needs to be melted.

And the more critical point is that in order to obtain some special alloys,

the processing temperature is even much higher than the melting point of the

material, and the temperature needs to be maintained for a certain period of

time to make the material properties fully change.

And these are precisely the places that are difficult to achieve with 3D

printing technology.

But these are not a problem for Chen Xin. The simple metal powder particles

are melted with a laser, so that different metal elements are mixed together

to form an alloy, and then the alloy is cooled and sintered to become the

required parts. All the 3D printers he manufactured can do To.

Moreover, the 3D printer manufactured by Chen Xin does not print through a

fixed frame and print head like traditional equipment, but looks similar to a

small robot.

A small robot carries a part of the raw materials, then melts the raw

materials into alloys according to a pre-designed procedure, and then prints

them.

With enough robots, a large part can be printed quickly.

This technology is inspired by some science fiction games, in which so-called

nano robots are often used to make objects through 3D printing, and Chen Xin

borrowed from this formal point.

It's just that he didn't make the robot so small, but made it into the style

of a small drone.

After agreeing to make a small prototype for engineers and technicians, Chen

Xin quickly completed the prototype through the workbench and robotic arm in

the refuge, and upgraded it.

"This...this is really amazing!" The engineers and technicians looked at the

small 3D printed robot like a drone and printed out a miniature model of the

Eiffel Tower in front of their eyes. They couldn't help but be amazed but they

seemed to have words. Poor.

"This is the small prototype of the 3D printing equipment I'm talking

about~www.mtlnovel.com~ Depending on the actual use needs, it can be made

larger or smaller. This size is more commonly used in various occasions. "Chen

Xin showed the prototype of this 3D printing device while introducing it: "It

can carry about two kilograms of raw materials each time, which can be

processed alloy powders or metal simple powder mixtures, and It can be printed

online by multiple devices to print out the large metal parts needed."

"With this, building construction has become much easier!" In the minds of

engineers and technicians, hundreds of these 3D printing robots are starting

to work at the same time, so that the buildings will grow out like bamboo

shoots in the ground.

"Well, not only for construction, it can also be used for mechanical

manufacturing and metal processing. The advantage of using 3D printing is that

the printing accuracy is sufficient, and the printed metal parts do not even

need to be reprocessed, and no matter how weird the shape you need, For 3D

printing, it can be achieved." Chen Xin looked at the engineers and

technicians excitedly, and said with a smile: "For some fields that require

high-precision parts, this is very useful."

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