machines and machinery.
equipment designed for super-fine finishes.
and supercalendering equipment.
- For jobs
where tolerances are critical.
- Large diameter
rolls and ball valves.
Click here to
request a quote Super Finishing
is Super Finishing?
The method of superfinishing produces finishes
unobtainable by any other method. The name is misleading, since
the normal tendency is to think that you must grind until you cannot
grind any better and then use superfinishing as an extra operation
to lower the finish. This is not so. Superfinishing is a method
to obtain a degree of surface quality ranging from less than one
micro inch to over 100 micro inches. It can be applied to ground
and/or turned cylindrical, spherical and flat parts.
is an area contact process as contrasted with the line contract
occurring by grinding with wheels or belts. Line contact processes
produce deviations in roundness and profile that are not always
visible to the naked eye. In superfinishing, our unit uses 24
square inches of contact area, which removes these deviations.
surface produced by superfinishing is much harder than the surface
produced by grinding, because of the low surface footage used.
In grinding, the surface footage of the wheel or belt is between
4000-6000 feet per minute, whereas in superfinishing, the shaft
rotation provides from 60-150 feet per minute. The high surface
cutting speed in grinding heats the surface that leaves a soft,
amorphous layer of fragmented metal that breaks down, greatly
reducing the life and quality of the product. The process of
superfinishing removes this soft metal, leaving a surface hardness
equal to that of the base materials.
Both photographs were taken of a roll ground and Superfinished
to the same microfinish. In the upper photo, notice the "smearing" of
the metal that occurs during a grinding process.
lower photo shows the same roll Superfinished. The soft, amorphous
layer of fragmented metal is removed. The surface is flat and
highly resistant to corrosion. The imperfections you see are
imperfections in the metal itself.
above photo shows what a ground roll or shaft really looks like.
The roll was highlighted by making a few passes with a superfinisher.
Notice the barring and chatter, affecting the roundness and profiles,
that is now visible to the naked eye.
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