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What are the main materials for CNC prototyping?

Oct 16,20

CNC prototype can be divided into plastic prototype and metal prototype according to the
materials used in the production:

  1. Plastic prototype: Its raw material is plastic, mainly the prototype of some plastic products, such as TV sets, monitors, telephones and so on.

In the rapid prototyping industry, the main plastic materials used to make plastic prototypes include ABS, PC, PMMA, nylon, POM, etc.Here is a brief introduction to the characteristics of the main commonly used materials:

ABS board: ABS board is a new material in the plate industry.Its full name is acrylonitrile/butadiene/styrene copolymer plate.It is the most widely used polymer with the largest yield.It organically unifies the various properties of PS, SAN and BS, and has excellent mechanical properties of toughness, hardness and stiffness phase balance.Its main characteristics are excellent impact strength, good dimensional stability, dyeing, forming and mechanical processing, high mechanical strength, high stiffness, low water absorption, good corrosion resistance, simple connection, non-toxic and tasteless, with excellent chemical properties and electrical insulation properties.It can resist heat without deformation and has high impact toughness under low temperature conditions.It is also a hard material that is not easily scratched or deformed.

PC board: PC board is polycarbonate as the main component, using a total EXTRUSION technology CO-EXTRUSION into a high quality plate.Due to its surface covered with a layer of high concentration of UV absorbent, in addition to uv resistant properties and can be maintained for a long time, never fade, impact resistance is the best plastic.

PMMA plate is also known as acrylic: it is the Chinese name of ACRYLIC, which can be translated as plexiglass.The chemical name is polymethyl methacrylate.Hong Kong people called acrylic, is an early development of an important thermoplastic, with better transparency, chemical stability and weather resistance, easy dyeing, easy processing, beautiful appearance, has a wide range of applications in the construction industry.Plexiglass products can usually be divided into pouring board, extrusion board and molding plastic.

Nylon is also called PA refers to the plastic made of polyamide resin, with high mechanical strength, good toughness, high tensile strength, prominent fatigue resistance, high soft point, heat resistance, smooth surface, small friction coefficient, wear resistance, corrosion resistance.

POM is polyformaldehyde, polyformaldehyde scientific name polyoxidized polyformaldehyde (POM for short) also known as Saigang, special steel.POM has a very low friction coefficient and good geometric stability, especially suitable for the manufacture of gears and bearings, high temperature resistance characteristics, so it is also used in pipeline devices (pipeline valves, pump housing), lawn equipment, etc. 

  1.  Metal prototype: its raw materials are aluminum alloy and other metal materials, mainly the prototype of some high-grade products.Such as mobile phones, tablets, projectors and so on.

Aluminum alloy: Aluminum alloy is one of the most widely used nonferrous metal structural materials in rapid prototyping models. It has been widely used in aviation, aerospace, automobile, medical treatment and ship rapid prototyping models.At present, aluminum alloy is the most widely used alloy in the prototype. Its advantages are easy to be machined and formed, good rigidity and rich anodic coloring.

Magnesium alloy: light weight, good strength, is consumer 3C like to choose materials.The disadvantages are that magnesium is inflammable metal, environmental control is very important in mechanical processing, and model making is highly dangerous. There are many mechanical processing projects after die-casting during production, making magnesium an application material with high cost.

Brass: Brass is an alloy of copper and zinc. Brass made of copper and zinc is called ordinary brass, and alloys made of more than two elements are called special brass.Brass has a strong abrasion resistance, brass in the rapid prototype model is often used in place of stainless steel and other difficult to carve milling materials, by polishing and electroplating surface effect and feel very close to stainless steel.

In the rapid prototyping industry, the main materials used to make metal prototypes are aluminum, aluminum alloy, stainless steel, copper, brass, steel and other metal materials processing, with the advantages of low density, good heat conduction and conductive function, generally can also be used for friction reduction, wear resistance and erosion resistance requirements.