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Chapter 406 Printing Robot

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    As we all know, metals exist in a combined state in nature, that is, forming so-called compounds.

    Only those extremely inactive metals exist in elemental form, such as gold, silver, platinum, palladium These precious metals are also called inert metals because they are stable in nature and do not easily react with other substances.

    Therefore, most of the metals that humans can obtain in nature are minerals that exist in the form of compounds, and new metal elements need to be obtained through smelting.

    However, pure metal has single physical properties and cannot meet the needs of use in many cases.

    For example, as we all know, iron is actually very soft as a simple substance. Only when it is combined with carbon to form an iron-carbon alloy 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, which is in the usual sense  What we commonly call steel.

    Human beings have a very long history of using alloys, which can be traced back to the ancient Babylonians more than 6,000 years ago. They were the earliest known civilization to begin smelting bronze, an alloy of copper and tin.

    The Yan Kingdom also began to use alloys a long time ago. In the Shang Dynasty more than 3,000 years ago, the ancestors of the Yan Kingdom people were already smelting and using bronze on a large scale, and could even obtain sharp edges through forging and other processing methods.  sword.

    The famous Yue King Goujian's sword is still extremely sharp even after thousands of years. It can cut through more than ten layers of paper with just one stroke.

    So 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 speaking, this can indeed be done, because the definition of alloy is a solid product with metallic properties obtained by mixing, melting, cooling and solidifying one metal with another or several metals or non-metals.

    So using 3D printing to print alloys, in theory, you only need to mix the metal raw materials together according to the required ratio, and then process them with laser to get the required alloy.

    However, it is not easy to do this.

    First of all, the mixing of metal powder must be very uniform in the overall proportion of the raw materials for each sintering. Otherwise, errors in the metal proportion will occur, and there will also be problems with the printed material performance, which will destroy the overall structure of the printed finished product.

    Before the disaster, Blue Star had already had laser 3D printing technology. Some people even printed a set of Iron Man armor out of titanium metal, which can withstand rifle fire.

    But this is done by spreading the metal powder in a closed equipment to a layer of only about 0.1mm or even a few microns, and then using a laser to sinter the area that needs to be printed.

    After repeating this process, layer by layer, the parts can be printed.

    During this process, if there is air flow disturbance, the unsintered metal powder will be blown away directly.

    Not to mention the interference caused by slow efficiency and air flow disturbance, due to the strict conditions, it is difficult to print large parts and alloys cannot be printed.

    If you just sinter the powder particles that have been processed into alloys, it is naturally very simple, but it is not that easy to process different elemental metals into alloys.

    Because a very important factor here is temperature.

    Sintering is processed at a temperature slightly lower than the melting point of the material to bond the powder particles. However, if you want to process different elemental materials into alloys, it is obviously impossible to rely only on sintering, and the material needs to be truly melted.

    And the more critical point is that if you want to obtain some special alloys, the processing temperature must be much higher than the melting point of the material, and the temperature needs to be maintained for a certain period of time to fully change the material properties.

    And these are precisely the things that are difficult to achieve with current 3D printing technology.

    But these are not problems for Chen Xin. The elemental 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. The 3D printer he created can do it.  arrive.

    And 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 material, and then melts the raw material into an alloy according to a pre-designed program, and then prints it into shape.

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

    This technology is inspired by some science fiction games, in which so-called nanorobots are often used to create objects through 3D printing, which is what Chen Xin draws on.

    It¡¯s just that he didn¡¯t make the robot that small, but in the style of a small drone.

    After agreeing to make a small prototype for engineering and technical personnel, Chen Xin quickly completed the prototype using the workbench and robotic arm in the shelter, and also upgraded it.

    "This this is really amazing!" The engineering and technical staff watched this small drone-like 3D printing robot print a miniature model of the Eiffel Tower in front of their eyes. They couldn't help but marveled but seemed a little speechless.  Poor.

    "This is what I call a small prototype of 3D printing equipment. Depending on the actual use needs, it can be made larger or smaller. This size is more versatile and can be used in various occasions." Chen Xin showed  Looking at the prototype of this 3D printing equipment, he introduced: "It can carry about two kilograms of raw materials at a time, which can be processed alloy powder or a mixture of metal powders, and can be printed online by multiple devices.  , print out the required large metal components.¡±

    "With this, construction will become much simpler!" Engineering and technical personnel have begun to imagine hundreds of such 3D printing robots starting work at the same time, making buildings grow like bamboo shoots in the ground.

    "Well, it's not just for building 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. The printed metal parts don't even need to be reprocessed, and no matter how weird the shape you need,  For 3D printing, everything can be realized." Chen Xin looked at the excitement of the engineering and technical personnel and said with a smile: "This is very useful for some fields that require high-precision parts." (Remember this site.  Website: www.hlnovel.com
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