FAQ
Q: What is Polishing?
A: Polishing
refers to a machining method that uses mechanical, chemical, or electrochemical
effects to reduce the roughness of the workpiece surface to obtain a bright,
flat surface. The use of polishing tools and abrasive particles or other
polishing media to modify the surface of the workpiece.
Polishing can not improve the dimensional
accuracy or geometric accuracy of the workpiece, but for the purpose of
obtaining a smooth surface or mirror gloss, sometimes used to eliminate gloss
(matting). The polishing wheel is usually used as a polishing tool. The
polishing wheel is generally made of multiple layers of canvas, felt, or
leather. The two sides are clamped with metal discs. The rim is coated with a
polishing agent made of finely powdered abrasives and grease.
Q: Can you Polish CNC Metal Parts?
A: Yes, it can
with below ways:
1.Mechanical polishing.
Mechanical polishing is a polishing method
that obtains a smooth surface by cutting and plastic deformation of the
material surface to remove the polished convex parts. Generally, whetstone
strips, wool wheels, sandpaper, etc. are used. Auxiliary tools such as
turntables can be used on the surface of the revolving body. If the surface
quality is high, the super-precision polishing method can be used.
Super-precision grinding and polishing is the use of special grinding tools, in
the grinding and polishing liquid containing abrasives, tightly pressed on the
surface of the workpiece to be processed for high-speed rotation. The surface
roughness of Ra0.008μm can be achieved by this technology, which is the highest
among various polishing methods. Optical lens molds often use this method.
2.Chemical polishing.
Chemical polishing is to make the
microscopic convex part of the material in the chemical medium preferentially
dissolve than the concave part, so as to obtain a smooth surface. The main
advantage of this method is that it does not require complicated equipment, can
polish workpieces with complex shapes, and can polish many workpieces at the
same time, with high efficiency. The core problem of chemical polishing is the
preparation of polishing solution. The surface roughness obtained by chemical
polishing is generally several 10 μm.
3.Electrolytic polishing.
The basic principle of electrolytic
polishing is the same as chemical polishing, that is, by selectively dissolving
tiny protrusions on the surface of the material, the surface is smooth.
Compared with chemical polishing, the effect of cathode reaction can be
eliminated, and the effect is better. The electrochemical polishing process is
divided into two steps: (1) Macro leveling The dissolved product diffuses into
the electrolyte, and the surface roughness of the material decreases, Ra>
1μm. (2) Low-light leveling Anode polarization, surface brightness increases,
Ra <1μm.
4.Ultrasonic polishing.
Put the workpiece in the abrasive
suspension and put it in the ultrasonic field together, relying on the
oscillation of the ultrasonic wave to make the abrasive grinding and polishing
on the surface of the workpiece. Ultrasonic processing has a small macro force
and will not cause deformation of the workpiece, but tooling is difficult to
manufacture and install. Ultrasonic processing can be combined with chemical or
electrochemical methods. On the basis of solution corrosion and electrolysis,
ultrasonic vibration is added to stir the solution to dissolve the dissolved products
on the surface of the workpiece, and the corrosion or electrolyte near the
surface is uniform; the cavitation effect of ultrasonic waves in the liquid can
also inhibit the corrosion process, which is beneficial to the surface
brightening.
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