FAQ
Q：Is Polycarbonate (PC) a plastic?
A: Polycarbonate
is a thermoplastic engineering plastic with excellent performance, with a
density of 1.2 g/m3. Specific good toughness and rigidity, good impact
resistance; molding shrinkage rate is generally 0.5%-0.8%, so the molded parts
can achieve good dimensional accuracy, and maintain its dimensional stability
in a wide range of temperature changes.
It has good creep resistance, wear
resistance, heat resistance, cold resistance and good weather resistance, and
excellent electrical properties. Polycarbonate has a low water absorption rate.
It is resistant to water, dilute acids, oxidants and reducing agents, salts,
oils, and aliphatic hydrocarbons at room temperature, but it is not resistant
to alkalis, amines, ketones, esters, and aromatic hydrocarbons; the
embrittlement temperature is less than- 100°C; heat distortion temperature is
135-143°C, it can be increased by about 15°C after being reinforced with glass
fiber, and the normal working temperature can reach 120°C.
Q: What’s the main properties of Polycarbonate
(PC)？
A:1. It has
high strength and elastic coefficient, high impact strength, and wide
temperature range;
2. High transparency and free dyeability;
3. Low molding shrinkage and good
dimensional stability;
4. Good fatigue resistance;
5. Good weather resistance;
6. Excellent electrical characteristics.
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).
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