Technology
NTN, one of Japan’s
leading precision equipment manufacturers, developed a sintered alloy with the maximum stress value of 700 Mpa that is the best in the industry. The new alloy
has about two times higher stress value than the existing mass-produced
products and 10-20% higher stress value than sintered alloys under development
in other research agencies. By increasing the strength, the company plans to
apply the new sintered alloy to power transmission parts for cutting work. NTN
acquired Nippon Kagaku Yakin in 2011. By utilizing this company’s technology on
precision metal mold and mass production, NTN wishes to put the new alloy into
practical use for automotive gear parts by 2014.
As compared with
producing a cutting ingot, producing a sintered alloy has two times higher
utilization ratio of material of 95-100% and needs 30-50% less energy in
manufacturing. However, because pressing down metal powder is needed to produce
a sintered alloy, tiny openings are created inside to produce a sintered alloy
because pressing down metal powder is needed. These tiny openings deteriorate
fatigue characteristics. That is why sintered alloys have not widely been used
for power transmission parts that require high strength.
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