FAQ
Q: Can you CNC plastic?
A: Because
the performance of plastic is different from that of metal and wood, the
thermal conductivity of plastic is poor, the coefficient of thermal expansion,
and the modulus of elasticity are low. When the jig or tool is deformed too
much, it is easy to cause deformation. When cutting, it is easy to melt due to
heat and easy to wear on the tool . Therefore, when machining plastics, the
tools used and the corresponding cutting speeds must be adapted to the
characteristics of the plastics. Therefore, plastics can also be cut, drilled
and welded with lasers.
Q: What is CNC plastic?
A: Plastic
is a synthetic polymer material. It has many excellent properties such as
corrosion resistance, high strength / weight ratio, convenient and fast
forming, rich colors and excellent electrical insulation. It has been used in
various industrial sectors. The production of plastic parts usually uses a mold
forming process. However, small batches of plastic parts still need to be
completed by CNC processing, that is, computerized digital control of precision
mechanical processing, CNC machining lathes, CNC machining milling machines,
CNC machining boring and milling machines, etc.
Q：Can a CNC
machine cut plastic?
A：1. CNC
lathe for plastic：If the surface requirements of the
workpiece are particularly high, the cutter head shall be designed as a wide
head row. For ends used to cut profiles, design. It is in the shape of rhombic
long edge to avoid excessive burr. When processing thin-walled and soft
materials, it is best to use a knife head with the same structure as a knife.
2.Drilling Holes for plastic：Twist drills can be used, with a helix angle ranging from 12 to 16
degrees. To facilitate chip removal, the helix groove should be smooth. When
the diameter of a hole is large, it is necessary to drill it step by step or
use a hollow drill or cut it directly. When drilling solid materials, pay
special attention to use a sharper drill bit, otherwise the increasing pressure
during drilling may cause the parts to crack. Compared with the unreinforced
materials, the reinforced plastics have higher internal stress and lower impact
strength in the machining process, so they are easier to crack. Therefore, if
possible, heat the profile to about 120 ° C before drilling the reinforcement
material (heating time is 1 hour for every 10 mm thick part). We recommend
heating nylon and polyester only when they are processed.
3.Tapping threads for plastic ：It is better to use a thread cutter to process threads, and use a
double tooth cutter to avoid flash. When tapping, the machining allowance shall
be considered (the machining allowance depends on different materials and
apertures, and the reference value is 0.1mm).
Q:What is the best plastic for machining？
A：1.ABS:
ABS resin is one of the five synthetic
resins. It has excellent impact resistance, heat resistance, low temperature
resistance, chemical resistance and electrical properties. It also has the
characteristics of easy processing, stable product size, and good surface
gloss. It is easy to paint. , Coloring, can also be surface sprayed metal,
electroplating, welding, hot pressing and bonding and other secondary processing,
widely used in machinery, automobiles, electronic appliances, instrumentation,
textile and construction and other industrial fields, is a very useful Wide
range of thermoplastic engineering plastics. ABS is usually light yellow or
milky white granular non-crystalline resin. ABS is one of the most widely used
engineering plastics.
2. Nylon:
The Nylon has the most superior comprehensive
properties, including mechanical strength, stiffness, toughness, mechanical
shock absorption and wear resistance. These characteristics, combined with good
electrical insulation and chemical resistance, make nylon a "universal
grade" material for the manufacture of mechanical structural parts and
maintainable parts.
3.PVC:
English abbreviation PVC (Polyvinyl
chloride), is a vinyl chloride monomer (vinyl chloride monomer, abbreviated as
VCM) in peroxide, azo compounds and other initiators; or under the action of
light and heat polymerized by free radical polymerization mechanism polymer.
Vinyl chloride homopolymers and vinyl chloride copolymers are collectively
referred to as vinyl chloride resins. PVC used to be the largest
general-purpose plastic in the world, and it is widely used. It is widely used
in construction materials, industrial products, daily necessities, floor
leather, floor tiles, artificial leather, pipes, wires and cables, packaging
films, bottles, foam materials, sealing materials, fibers, etc.
4.Bakelite：
Bakelite has high mechanical strength, good
insulation, heat resistance and corrosion resistance, so it is commonly used in
the manufacture of electrical materials such as switches, lamp holders,
headphones, telephone cases, instrument cases, etc.
5.Acrylic（PMMA）
The chemical name of this transparent
polymer material is polymethyl methacrylate, which is a polymer compound
polymerized by methyl methacrylate. It is an important thermoplastic developed
earlier. Plexiglass is divided into colorless transparent, colored transparent,
pearlescent, embossed organic glass. Plexiglass is commonly known as acrylic,
mid-range acrylic, and acrylic. Plexiglass has the advantages of good
transparency, chemical stability, mechanical properties and weather resistance,
easy dyeing, easy processing, and beautiful appearance. Plexiglass is also
called gelatin glass, acrylic, etc. The material is widely used in the
production of advertising light boxes and nameplates.
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