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No.5（2002）2.Evaluation of the fatigue resistance and tightening characteristics of aluminum alloy tapping screws
Yoshihiro FUNAYAMA, Tomoki MASUKO, Takahiro TANAKA and Mamoru TAKAHASHI
An evaluation was carried out on the fatigue resistance and tightening characteristics (screwing performance and holding force) under standard temperature, atmospheric and corrosive environment conditions of samples that were prepared by applying anodic oxide coating and electroless nickel-plating to an aluminum alloy tapping screw (nominal designation of thread: 6). The result was as follows: The fatigue strength of 107 cycles under the normal temperature atmosphere was 15.8 MPa for the anodic oxide coating sample and 17.5 MPa for the electroless nickel-plating sample. The fatigue strength of 107 cycles under corrosive environment conditions was 10 MPa for both samples, low at about 60% of that under standard temperature and atmosphere conditions, which implied the necessity of specifying application environment. On the other hand, the screwing performance and holding force of both the samples were about the same value, displaying better tightening performance compared with that of a stainless steel tapping screw.
Keywords
Aluminum alloy, Tapping screw, Fatigue resistance, Tightening characteristic, Stainless steel
Yoshihiro FUNAYAMA, Tomoki MASUKO, Takahiro TANAKA and Mamoru TAKAHASHI
An evaluation was carried out on the fatigue resistance and tightening characteristics (screwing performance and holding force) under standard temperature, atmospheric and corrosive environment conditions of samples that were prepared by applying anodic oxide coating and electroless nickel-plating to an aluminum alloy tapping screw (nominal designation of thread: 6). The result was as follows: The fatigue strength of 107 cycles under the normal temperature atmosphere was 15.8 MPa for the anodic oxide coating sample and 17.5 MPa for the electroless nickel-plating sample. The fatigue strength of 107 cycles under corrosive environment conditions was 10 MPa for both samples, low at about 60% of that under standard temperature and atmosphere conditions, which implied the necessity of specifying application environment. On the other hand, the screwing performance and holding force of both the samples were about the same value, displaying better tightening performance compared with that of a stainless steel tapping screw.
Keywords
Aluminum alloy, Tapping screw, Fatigue resistance, Tightening characteristic, Stainless steel
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