Page 33 - Iscar Article 2_2017
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Throughout the world, machinists have developed a comprehensive series of high-
to deal with the presence of problematic quality internal boring bars for different insert
vibrations on a daily basis. To help solve geometries, covering all machining applications
these difficulties, ISCAR’s Research and from 4xBD to 10xBD.
Development department has developed
a wide range of anti-vibration tools that ISCAR offers three types of boring bars:
are able to reduce or even eliminate this solid steel, solid carbide and anti-vibration.
challenging phenomenon, across a wide The maximum overhang for solid steel boring
bars is up to 4xBD. This limitation is due to
range of machining disciplines. Today, the fact that machining with a longer length
ISCAR’s acknowledged expertise in the of steel shank (more than 4xBD) can induce
design and development of anti-vibration unwelcome vibrations due to the elasticity and
tools has been applied to the boring bar. characteristics of the steel.
One of the most common turning applications In order to limit the vibration on a higher
is the boring of components, a function also overhang of more than 4xBD and up to
known as internal turning. The most widespread 6xBD, the use of solid carbide boring bars
tools used for this type of machining operation is recommended. Solid carbide boring bars
are boring bars. Boring bars’ shapes enable represent an excellent, highly efficient option for
them to operate through previously drilled boring applications of up to six times the tool’s
holes, and to efficiently enlarge and accurately machining depth. This capability is attributable to
profile holes according to their specific solid carbide possessing a coefficient of elasticity
requirements. The correct application of a that is three times higher than that of steel.
boring bar enables a bore’s internal profile to
be machined according to specification, an However, when the machining of high overhangs
accurate hole diameter to be achieved and the of more than 6xBD is required, even the use
required surface finish quality to be realized. of a solid carbide shank can cause vibrations.
In order to cover the complete range of Therefore, in these cases the use of solid carbide
applications for internal turning, ISCAR has can be somewhat limited.
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