3D printing has been known to everyone - whether it's newspapers, blogs or TVs, you can see information about 3D printing. Therefore, what this information conveys to the public is that in the future, whether we are at home or in a print shop, we can download the data model, or build a model with an application such as CAD, and then easily put it through a 3D printing device. print it out. But in fact, as far as current technology development is concerned, we should know that 3D printing is still exaggerated.
Face the true strength of 3D printing products!
For parts, 3D printed products do not have as much strength as parts produced by traditional manufacturing. In the 3D printing process, these products are stacked in a layer-by-layer printing process, which is both its greatest advantage and its biggest drawback. For example, traditionally cast parts have a uniform, stable strength in cross-section due to the high consistency of the material structure. But the finished product of 3D printing is constructed in layers, which means that the bond strength between each layer and each layer has a fatal weakness, because the bond strength of such products on the Z axis is much higher than that. The bonding strength of the X-axis or the Y-axis is poor. If you want to describe the Z-axis adhesion, it's like using Lego bricks to build a wall - you put all the bricks together and press them together, feel the strength is enough, but it is easy to push it from the side It collapsed because the bond strength between each layer of the building wall and each layer is relatively low.
What does surface treatment affect?
The surface of the 3D printed product that people see is smooth, but in fact, the surface of the semi-finished product that has just been printed is very rough, and the staff uses a variety of post-processing methods to make the semi-finished product smooth and shiny, but these treatments are usually It takes a lot of labor and uses acetone chemicals, and this type of treatment will make it difficult to control the accuracy of 3D printed parts, and it is easy to lose details beyond the tolerable tolerance.
Relatively rapid prototyping technology!
3D printing is only relatively fast forming. If there are very strict process requirements for the printed product, the printing time of this print may take several hours or even several days. Of course, you can increase the print progress by increasing the print thickness of each layer, but then the surface smoothness will inevitably be affected. I have a bold prejudgment that "the future 3D speed will be faster" is not necessarily correct, because of the nature of the material, such as ABS resin (Acrylonitrile Butadiene Styrene) and PLY (polyester fabric, polyester), the speed of extrusion/printing of these materials can only be within the range of its property destruction range. The current 3D printer using FDM (melt deposition molding) technology has adjusted the printing speed to materials. The highest speed has been withstood.
3D printer selection!
From a theoretical perspective, you can use a 3D printer to print hundreds of different types of materials, but can they all be done in your living room? Absolutely not. We seem to ignore the different types of 3D printers on the market today, each with their own strengths. For example, FDM type 3D printer, which is the current mainstream application technology, can extrude ABS or PLY in a relatively safe manner, and the material is cooled quickly. However, the product details are poorly expressed and the material cost is relatively high. In addition, the surface of the finished product printed by the laser powder 3D printer is relatively smooth, and sometimes it can cause an explosion if it is printed with a complicated product such as a pistol. Other 3D printers generate a lot of heat during the printing process, which is also a waste of energy. For now, the FDM 3D printer is the only 3D printing device for home use.
3D printed substrate
In general, during 3D printing, you can only select a single material for printing, and most of it is plastic. Now look around and see how much of your room is made of plastic, only plastic, not mixed with other materials. The answer is only two: the cup and the lens cap. The printing cost of the cup is 5 pence. The lens cap is very expensive, it needs to have very high precision, it needs to be closely attached to the lens (such products can not be done with 3D printers, due to the disadvantages of layered printing), of course, from the cost point of view, we The 3D printing method will not be selected. On the other hand, most of the items in the house are made up of a variety of materials, most of which contain both metal and plastic. Can these two parts be made together? The answer is certainly no. Because the melting temperatures of the two are different by hundreds of degrees, even thousands of degrees. (Editor: Zhang Wei)
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