ISO CNC Blades AP30
Small knowledge of CNC blades
►Main cause of abrasion
Abrasion of CNC inserts, abrasive wear chips or some tiny hard
spots (such as carbides, oxides, etc.) and impurities (such as
sand, oxide scale, etc.) on the surface of the workpiece, as well
as adhered built-up edge fragments, etc. A type of mechanical wear
caused by a grooved surface inscribed on the surface. For
high-speed steel tools with low speed and low cutting temperature
(such as broaches, dies, taps, etc.), it is the main cause of wear.
Adhesive wear forms fresh surface contact under the action of
positive pressure and cutting temperature between the flank of the
CNC blade and the surface of the workpiece and the rake surface of
the CNC blade and the chip. Adsorption bonding occurs when the
contact surfaces reach the interatomic distance. The station node
is gradually cut and torn away by the workpiece or the chip, and
the surface of the CNC blade produces adhesive wear. Bonded wear is
one of the main causes of carbide wear when cutting at moderately
low cutting speeds.
Diffusion wear is under high temperature and high pressure, and
some chemical elements in the CNC blade material and the workpiece
material diffuse each other in the solid state, that is, elements
such as Ti, W, Co in the cemented carbide diffuse into the steel,
while Fe, C in the workpiece Such elements spread to the CNC blade,
resulting in a decrease in the hardness and strength of the blade
surface, an increase in brittleness, and aggravation of tool wear.
This is diffusion wear, and diffusion wear is one of the main
reasons for the wear of cemented carbide tools during cutting at
high temperatures (800"900°C).
Generally, the diffusion rate of W and Co is faster than that of Ti
and Ta, so the high-temperature cutting performance of YT-type
cemented carbide is better than that of YG-type. When the
high-speed steel tool is used for phase change wear, when the
cutting temperature exceeds its phase transition temperature
(550"600°C), the metallographic structure of the CNC insert will
change, the hardness will decrease, and the wear will be
accelerated. One of the main reasons for the wear of high-speed
steel CNC inserts. Chemical wear at a certain temperature, the
surrounding media in the cutting area, such as air, cutting fluid,
etc., chemically react with the tool material to form some loose
and fragile compounds. These compounds are easy to be cut and The
workpiece is scratched and taken away, causing wear of the CNC
blade.
