Conventional
calendar rolls for paper machine have been made of stationary cast method for
long time. Recently the calendar rolls are especially required for abrasion
resistance caused by the current of highly speed paper machine.
To
meet the requirements, it is necessary to boot up hardness of roll¡¯s surface.
The
conventional technology of the stationary casting faces a limitation in roll
surface hardness (by maximum Hs 74). There needs to adapt high alloy material
for the roll.
Then,
high alloy is adopted in the stationary casting roll, over-all of inside of the
roll turned too hard to maintain impact-proof, and may cause breakage in
driving.
There
is an option, too, that by vaporizing method toughness can be improved up to
some grade, but chilled degree results difference part by part of the roll
body, which makes cause trembling in operation and lowering of precision.
It
is the reason to develop the centrifugal casting technology to take away
defaults of conventional stationary casting method. The core of the centrifugal
casting is that cast a outer of the roll
with high alloy materials first, and then cast an inner part of it with
some specific materials, secondly
giving heat for a bit melted the cooled layer(outer surface) of the roll
to alloy with inner layer¡¯s materials. In this time the melting volume is
varied according to inner layer¡¯s (surface¡¯s) materials source and outer
surface thickness is not uniformed. In the result, the roll comes out wrenched.
To
avoid such distorted figure, we have successful technology of Centrifugal Casting, which secures uniformed
thickness of the roll¡¯s outer surface.
Since
1984 we have produced by the centrifugal
casting ultimately improved roll of excellent hardness and provided them our
customers with fully satisfactory more than 300 rolls.
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3. Special Features of
Centrifugal Casting Roll
(1) Hardness Upgrade¡¯s
possible.
¨ç Roll¡¯s surface is smooth........
Improving paper¡¯s
smoothness
Improving paper¡¯s
brightness
Lengthening grinding
cycle
¨è Lessening one-side worn
out....................
Lengthening grinding
cycle
¨é
Highly excellent
abrasion resistance ........... Enjoying longer life of
roll
¨ê Lessen harness falloff............................. Enjoying longer life of
roll
(2)
Superior
hardness in material quality
No
breakage occurred at the chill-treated part
(3)
Handy selection of the
roll material depending on usages
¨ç Abrasion resistant roll
¨è Corrosion resistant roll
As
shown above, there are comparison Centrifugal cast roll to Stationary cast
roll.
The
Centrifugal cast roll is on trend more demanding in the market due to high
hardness of the roll. And further not only high-alloy chill-treated cast roll
but high Chrome cast roll with excellent abrasion resistance are also producing
now .
We
are concentrated ourselves in development new source of material making use of big merits
of Centrifugal casting technology, we are eagerly waiting for your positive
orders of the centrifugal cast roll
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