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What are the finished of 3D printing?

Mar 26,21

What are the finished of 3D printing?

3D
 printing works by superposition forming step by step, the layered manufacturing will effect exist steps, although the decomposition of each layer is very thin, but under the microscopic size, still exists a certain thickness of multilevel steps, model surface quality of the print and print materials, precision machine, print speed, temperature, quality of 3 d data model, slicing parameters such as have relations, in order to better solve the problem of printing product surface quality, this needs the model post-processing fluctuation kongfu, today is to introduce the post-treatment technology of several common!!!!


1. Sand paper

3D-printed objects sometimes have rough surfaces that need polishing.
Polishing is divided into physical polishing and chemical polishing.
Although the FDM technology equipment can produce high quality parts, it has to be said that the layers of grain on the parts are visible to the naked eye, especially in the case of a large amount of support. This can often affect the user's judgment, especially when appearance is an important factor in the part, which requires post-processing with sandpaper.
Sandpaper grinding principle: first coarse and then fine, first rough grinding and then fine grinding.

2. Chemical polishing

Take ABS material as an example, can use acetone steam for polishing, can also be in the ventilated place boiling acetone to fumigate print finished products, can also choose other polishing machine on the market;

But PLA materials can not be polished with acetone, there is a special PLA polishing oil, but the chemical polishing should be mastered well, because it is at the cost of corroding the surface.
Generally speaking, chemical polishing is not mature and widely used at present, so it can be used as one of the alternatives for post-treatment.

3. Sandblast the surface

Surface sandblasting is also a common post-processing process. The operator holds a nozzle to spray medium beads towards the polishing object at high speed to achieve the polishing effect.
Pearlescent treatment is generally relatively fast, about 5 ~ 10 minutes can be completed, after the treatment of the product surface is smooth, there is a uniform matte effect.
Here is the comparison:

4. Color the surface

In addition to the products printed by full-color 3D printing equipment, other 3D printing equipment can generally only print a single color.
Sometimes it is necessary to color the printed objects, such as ABS plastic, photosensitive resin, nylon, metal, etc., different materials need to use different pigments.

General process of coloring:

1) the impression

As a whole, use the spray gun to select the primer close to the color of the finished product, generally adopt thin coating, layer upon layer overlay.
Details, and the overall color contrast of the larger part can be reserved without spray.

2) color block

Generally speaking, the color should follow the process from large area to large area, from spraying to hand.
This is good for efficiency.
First, a large area of color block spraying, and then to the small area of color block hand coating, spraying and hand coating, to complete the overall color painting.

3) Color adjustment

Spray retouching stage, this step is mainly through a layer of superposition, color, cover dyeing, gradual change, transition and other color adjustment, emphasizing the color structure and details.

4) Colour local details

Mainly for details, such as facial features, clothing details, aging, imitation of copper and other mottled marks, grain, etc.
Through the description of the details, the original image of the model is highly restored, the modeling features are highlighted, and the most real model is shaped.

5) Light sensitivity adjustment

Fine color adjustment can be divided into two main categories: matte treatment and gloss treatment.
According to customer needs, use matte oil or bright oil to adjust the texture, to create the whole matte or bright, part of the matte or bright, to achieve a high degree of simulation model texture.

 
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