La description
PELLETIZING KNIFE MUST HAVE THE FOLLOWING CHARACTERISTICS
Pelletizing knife can effectively work with fixed knife
(granulation die plate) under water at *0 ~ *0 C.
Hardness of pelletizing blade must be HRC **5 lower than that of
the cutting surface of die plate so that it can reduce the wear
of the die plate.
It should have high temperature resistance, corrosion resistance,
cavitation resistance and wear-resistant properties.
It should have a lower affinity to the molten plastics, i.e.
uneasy to stick a knife.
Pelletizing knife should not be uneasily broken under abnormal
condition.
CHOICE OF PELLETIZING KNIVES
With the increasing grades and extending melting index of the
plastics, not only smooth die plate granulation surface, sharp
edge and small gap between cutting surface and knife blade are
required, the sharpness of pelletizing blade is also strictly
required in the granulation process of high melting index
plastic.
In order to adapt to the production requirement of high melting
index plastics, the following measures should be taken for the
pelletizing knives:
When the cutting surface of die plate is very flat and the cutter
runs with it easily, metal-ceramic composite pelletizing knives
can be used. The edge width should be controlled below 2.5mm.
When the cutting surface of die plate is not very flat,
instrument steel with composite coating or fused composite
pelletizing knife may be used.
Adjustment of the hardness of the pelletizing blades makes them
more suitable with the hardness of cutting surface of the die
plate. Reducing the hardness of cutting edge of granulation knife
to HRC **9difference with the hardness of the granulation part of
die plate to ensure that the wear of die plate is lower than that
of the cutter.
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METAL-CERAMIC COMPOSITE PELLETIZING KNIFE
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THE FIRST TECHNICAL CHARACTERISTIC OF CERMET PELLETIZING
KNIVES-MATERIAL (COMPOSITION)
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The so-called cermet is sintered by powder metallurgy technology
with a metal or alloy as the bonding phase and a refractory metal
compounds (mainly titanium carbide or tungsten carbide) as the
hard phase. The microstructure is characterized by small
hard-phase grains homogeneously distributed in metal or alloy
matrix.
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The chemical composition of the metal ceramic materials developed
in Jinfeng Company mainly contains Ti, C, Ni, Cr etc., where NiCr
is used as binder. Its heat and corrosion resistance are better
than that of Fe-based materials manufactured in Germany or Japan.
The reason is that Ni forms solid solution with Cr and the
hardness is maintained at elevated temperature of up to
**0℃. This can ensure that hard phase works
well and the wear resistance of cutter edge is improved.
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THE SECOND TECHNICAL CHARACTERISTIC OF CERMET PELLETIZING KNIVES
- MATERIAL CHOICE FOR THE KNIFE BODY
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Suitable material of knife body should at least meet the 2
following requirements. â‘ a sufficiently high strength and
toughness. â‘¡ excellent welding performance with the cutting
edge. We have chosen high quality structural alloy steel or high
quality martens tic stainless steel of granulation knives for
different devices.
These two materials have respectively different characteristics:
â‘ Structural alloy steel knife body production of
abnormal devices under weak alkaline pelletizing condition. â‘¡
martens tic stainless steel knife body with good corrosion
resistance and is used in stable operation with adaptive devices
under acid pelletizing condition.
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Knife body: alloy steel or stainless steel
Knife blade: Cermet blade
| Pays: |
China |
| N ° de modèle: |
JF-QLD
|
| Prix FOB: |
1650 ~ 6600 / Set ( Negotiable ) (Negotiable)
Obtenir le dernier prix
|
| Localité: |
China shenyang |
| Prix de commande minimale: |
1650 per Set |
| Commande minimale: |
1 Set |
| Packaging Detail: |
wooden case packaging |
| Heure de livraison: |
within 15 working days |
| Capacité de Fournir: |
500 Set per Year |
| Payment Type: |
T/T |
| Groupe de produits : |
plastic granulator accessories
|
