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| H-ALLOY
CYLINDERS & SCREWS FOR INJECTION MOLDING MACHINES |
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Overview |
In recent years,
more and more has been demanded of screws and cylinders for plastic
injection molding. Especially in the areas of plastic magnets and
rubber magnets, higher wear and abrasion resistance than is offered
by conventional glass reinforced plastics has now become a necessity.
Applying its specialty steel and roll manufacturing technology, Hitachi
Metals provides its customers with products that fulfill such needs.
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| H610
Highly-functional H-alloy Series |
Hitachi Metals has developed the H610 (Figure 1) Nickel-based
alloy cylinder, which features substantially improved strength
in both the H-Alloy and the base material. Hitachi Metals currently
manufactures and delivers cylinders with diameters of  120
or less to meet the expectations of its customers. Recently,
in the engineering plastics extrusion mold industry, stringent
demands are being placed on molding, for example for conversion
to high injection pressure systems, high cycle molds and molding
of difficult-to-mold materials to provide high-added value
and reduce costs. As a result, demand has arisen for cylinders
for high-strength injection molds with high levels of resistance
to corrosion and wear and abrasion. However, Hitachi Metals'
standard product, the H503 Nickel-based alloy cylinder, lacked
the necessary durability to meet these demands. Although the
end of the cylinder may be shrink-fitted to the sleeve to increase
strength, this has the disadvantage of increasing the manufacturing
cost of the cylinder as well as the production time. Hence,
to overcome these difficulties, Hitachi Metals developed the
H610 Nickel-based alloy cylinder as part of the H503 series. |
Figure 1: H610 H-Alloy series
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The H610 series features a structural steel alloy base material
with a centrifugal cast lining on the interior face of a Nickel-based
alloy, which superior features corrosion-resistance and wear
and abrasion resistance. The series has the following features.
(1) Significant increase in alloy strength and base material
strength (Chart 1)
(2) Improved resistance to heat fissures (Figures 2, 3)
| Chart 1: Mechanical Strength |
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Sintered Material |
Characteristics of
Alloy Layer |
Strength of Base Material |
Strength of pressure |
Type
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Alloy |
Base Material |
Hardness
HRC |
Transverse Strength
kgf/mm2 |
Tensile Strength
kgf/mm2 |
0.2% Strength
kgf/mm2 |
Pressure Resistance
(Compared to H503) |
| Standard Material (H503) |
H503 |
SCM440 |
50~60 |
50~60 |
70~75 |
35~40 |
1 |
| Newly Developed Material(H610) |
H610 |
SCM440 |
50~60 |
95~110 |
82~90 |
47~55 |
1.7~2.3 |
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Figures 2, 3: Comparison
of Structures of H503 and H610 Following Heat Treatment
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H503 (Following heat treatment
at 700°C)
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H610 (Following heat treatment
at 900°C)
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Figure 3:
Results of Heat
Fissure Testing
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| H610 has been used in over 2,000 products, mainly small-scale
cylinders. This has allowed Hitachi Metals to verify that that
the results have lived up to the expectations of its customers.
Increasing numbers of injection mold machine makers are considering
converting to shrink-fit cylinders. In addition, Hitachi Metals
was able to confirm in testing that H610 is highly compatible
with the screws it manufactures and is suitable for difficult
molding conditions. In the future, Hitachi Metals expects to
continue to expand the range of cylinder dimensions and, in
the field of injection molding, greatly increase added value
and significantly decrease costs. |
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| Inquiries |
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