Briefly describe the characteristics of the 3D printing process and the scope of application

A 3D printer, a type of rapid prototyping machine, is a technology that uses adhesive materials such as powdered metal or plastic to construct objects layer by layer based on digital model files. In the past, it was often used to make models in mold making, industrial design and other fields, but now it is gradually being used in the direct manufacturing of some products, which means that this technology is becoming popular. Actually, you can understand it as an industrial computer.

The plastic products we use every day are modeled through the network, and then the machine is instructed to complete the three-dimensional spraying; It can be said that any industrial computer can be regarded as a 3D printer; It's just that the raw materials added to each machine are different. The printer reads the cross-sectional information in the file, prints these sections layer by layer with liquid, powder, or sheet material, and then glues the layers together in various ways to create a solid. The peculiarity of this technique is that it can create objects of almost any shape.

Industries with high demand for 3D printers include **, aerospace and defense, medical devices, high technology, education, and manufacturing. Therefore, its commercial value lies in how to use it correctly to form a good industrial chain, and it also needs technological transformation in all walks of life.

The three major features of 3D printing are as follows:

1. It can manufacture the shape that cannot be manufactured by traditional production technology.

dPrinting requires no machining or tooling, and parts are generated directly from the computer. Fabricating complex items without increasing costs will break the traditional pricing model and change the way manufacturing costs are calculated.

3. In the case of a good design concept and design process, the technology can also simplify the production and manufacturing process.

The principle of 3D printing

3D printing technology is basically the same as laser forming technology, which simply means that 3D entities are generated by layering processing, superimposing molding, and adding materials layer by layer. It is called a "printer" because of its technical principle, and the layering process of a 3D printer is very similar to that of an inkjet printer.

First of all, the computer is used to design the three-dimensional model of the required parts, and then according to the process requirements, the model is discretized into a series of ordered units according to a certain law, and it is usually discretized according to a certain thickness in the Z direction, and the original three-dimensional CAD model is turned into a series of layers; Then, according to the contour information of each layer, input the noisy processing parameters, and then automatically generate CNC ** after the system; Finally, a series of layers are formed and automatically connected to obtain a three-dimensional physical entity.

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What are the main steps in the process planning process of pro-3D printing are as follows: 1. The three-dimensional design is first modeled by computer modeling software, and then the completed three-dimensional model is "partitioned" into layer-by-layer sections, that is, slices, so as to guide the printer to print layer by layer. 2. The slice processing printer prints these sections layer by layer by reading the cross-sectional information in the file, and then glues the layers of sections in various ways to create an entity.

The peculiarity of this technique is that it can create objects of almost any shape. 3. The resolution of the finished printed 3D printer is sufficient for most applications (it may be rough on the curved surface, like the sawtooth on the image), and the higher resolution items can be obtained by the following methods: first use the current 3D printer to hit a slightly larger object, and then slightly polish the surface to obtain a smooth surface "high-resolution" item.

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There are many different types of 3D printing according to the material and molding method: LOM. This is in the form of laminating paper coated with a hot-melt adhesive and laser-cutting the contours; sla。

The method of using liquid photosensitive resin can be quickly cured into a solid under ultraviolet light irradiation; sls。Laser selective sintering molding (raw materials can be plastic powder, ceramic powder, metal powder, etc.); FDM, which uses plastic filament to be melted and printed layer by layer; 3dp。The raw material is powder and resin, and it can be printed in color.

There may be others in development.

At present, as far as I know, there are three main types of 3D printing technology, the most common one is extrusion 3D printing, which can only be answered by some hot melt materials, which can be bought on a certain treasure; The second is light-curing 3D printing, which is a technology that uses ultraviolet light to irradiate the liquid light-curing material and make the light-curing liquid into a solid state. The third is also the most potential 3D printing method that I personally think, laser sintering technology, which uses the heat of the laser to scan the powdered raw materials to melt them, layer by layer, to form a complete three-dimensional model, its raw materials are diverse, can be plastic, glass, or metal, etc., and the precision is very high, due to the high cost, there are only industrial grades, I believe it will not be too far into the homes of ordinary people.

3D printing technology can be divided into FDM, SLA, 3DP, SLS, LOM, PCM types; FDM It belongs to the fused deposition of rapid prototyping, the materials are mainly PLA and ABS, SLA belongs to the light-curing molding, the raw materials are mainly photosensitive resin, 3DP He is the young of three-dimensional powder, the main material is powder material, SLS is selective laser sintering, it is also based on powder materials, LOM is the entity manufacturing that is divided, its main materials are plastic film, metal film, paper, PCM It adopts the manufacturing technology of moldless casting.

It can be divided into three types, one of which is FDM, this printing technology will be melted and deposited by means of ABS, and then formed into a 3D printed product; The second type is SLA, which is a light-curing type, and the main raw material used is photosensitive resin; DLP is mainly through photosensitive resin to achieve the effect of digital light treatment.

It can be divided into 5 types. FDM mainly uses the principle of melting, extruding the material for curing. SLS mainly uses the principle of laser.

SLA is mainly based on the principle of bright business. 3DP will make something different by processing the powder.

It can be divided into two types, namely 3DP technology or FDM fusion lamination molding technology. Mainly through this research, coupled with the collection of data, as well as the improvement of functions, the original principles are superimposed to form 3D printing technology.

Advantages and disadvantages of the 3D printing process:

Advantages and disadvantages of SLA (Light Curing Technology).

Pros:1The molding process has a high degree of automation.

2.High dimensional accuracy. The dimensional accuracy of SLA prototypes can be achieved.

3.Excellent surface quality.

4.The system has a high resolution, and can make models or parts with complex structures.

Cons: 1Parts are susceptible to bending and deformation and need support.

2.The cost of operation and maintenance of equipment is high.

3.There are fewer types of materials that can be used.

4.Liquid resins are odorous and toxic, and need to be protected from light.

5.Parts cured by liquid resin are brittle and prone to breakage.

Advantages and disadvantages of SLS (Powder Sintering Technology).

Advantages: It can be directly made into metal parts (exclusive).

A wide selection of materials is available.

Complex components or molds can be manufactured.

There is no need to add pedestal support.

Material utilization.

Disadvantages: The surface of the sample is rough and granular.

Harmful gases are generated during the process.

Advantages and disadvantages of FDM (fused deposition).

Advantages: The whole system is simple in structure and operation, low maintenance cost, and safe operation of the system. Non-toxic raw materials can be used, and the equipment system can be installed and used in an office environment.

The process is clean, simple, easy to operate and does not produce waste.

The unique water-soluble support technology makes it easy to remove the support structure, allowing for the rapid construction of bottle-shaped or hollow parts as well as one-shot assembly structures. The most mature technology on the market, many companies are producing such products, such as Aurora.

The raw materials are supplied in rolls of material, which are easy to handle and quick to change.

A variety of materials can be selected, such as various colors of engineering plastics ABS, PC, PPSF and medical ABS.

Disadvantages: The molding accuracy is lower than the SLA process, and the accuracy.

The molding surface finish is not as good as the SLA process.

The molding speed is relatively slow.

Summary. Dear, hello, I am happy to serve you, here for you to find out, a brief description of the definition of 3D printing technology and the 3D printing process is as follows: 3D printing technology is a technology that adds layers of materials, based on digital models, stacks materials layer by layer, and finally forms physical objects.

The 3D printing process mainly includes: design model, print file analysis, printer settings, printing material selection, printing process control, and processing after printing is completed.

This paper briefly describes the definition of 3D printing technology and the 3D printing process.

Dear, hello, I am happy to serve you, here for you to find out, a brief description of the definition of 3D printing technology and the 3D printing process is as follows: 3D printing technology is a technology that adds layers of materials, based on digital models, stacks materials layer by layer, and finally forms physical objects. The 3D printing process mainly includes:

Design model Zheng number, print file comma analysis, printer settings, printing material selection, printing process control, printing after the completion of the mountain shed and other steps.

Dear, hello, I am happy to serve you, here for you to find out, a brief description of the definition of 3D printing technology and the 3D printing process is as follows: 3D printing technology is a technology that adds layers of materials, based on digital models, stacks materials layer by layer, and finally forms physical objects. The 3D printing process mainly includes:

Design model Zheng number, print file comma analysis, printer settings, printing material selection, printing process control, printing after the completion of the mountain shed and other steps.