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Tokuhatsu Co.,
Ltd. pioneers tomorrow with products that become the basis
for various technologies. |
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Home
page > Technical introduction > Heat
treatment |
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Heat
treatment technology especially for making
springs
Steel is born again as springs are tempered
by heat, breathing life into the spring. The
characteristics needed for specific applications
are created to match the materials and specifications
by using our own hardening/tempering furnaces,
austempering furnaces, and tempering furnaces. |
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Can be used
to fabricate a wide variety of products in
small quantities. |
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1. |
Continuous hardening/tempering
furnace: Suitable for plain washers,
disc spring washers, etc. |
2. |
Continuous austempering
furnace: Produces superior springs, such
as flat springs, that cannot be allowed
to deform during heat treatment. Can
also be used to produce small quantities. |
3. |
Press tempering: Used
for products which require more dimensional
precision than the heat-treated products
mentioned above. |
4. |
Various types of nitriding
treatments: Suitable for sliding parts. |
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Continuous austempering furnace |
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. What is
austempering? |
Furnace construction |
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Austempering
is used to add strength and tenacity to press-molded
work.
The work is heated to a temperature of 850oC,
and the austenitized work is then cooled in
a salt tank (nitrate of potash + sodium nitrite)
held at 320 - 385oC without transforming it
to martenite. It is rinsed in water and dried
to create a bainite structure.
The product gains a bainite organization during
the austempering treatment, which reduces hardening
cracks and deformation, compared with products
hardened and tempered normally. These materials
excel in resistance to fatigue from repeated
impact and are suitable for small or thin springs. |
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Furnace specifications |
Equipment
name |
Throughput
(kg)/h |
Q'ty |
Manufacturer |
Austempering
furnace
Wire mesh conveyor furnace |
45-135 |
2 |
Gasden
Ro, Parker Heat Treatment |
Hardening/tempering
furnace |
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3 |
Daido
Plant |
Batch
furnace |
30-180 |
5 |
Gasden
Ro, ESPEC |
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