自動車用TRIP鋼板の疲労特性に及ぼすバーリング・タッピングの影響

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  • Effect of Burring and Tapping on Fatigue Characteristics in Automotive TRIP Sheet Steels

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For the purpose of further improvement on the barring-tapping, in this investigation, the effect of burring and tapping on fatigue characteristics in TRIP sheet steels (TDP steels) were studied. The chemical composition of the TDP steels used in this study was (0.1-0.4)C-1.5Si-1.5Mn (mass%) steels of cold-rolled sheet steels (thickness: 1.2 mm). These steels after heat treatment were named TDP1 to TDP4. For comparison with TDP steel, the ferrite martensite dual-phase sheet steel (MDP steel) was also prepared. Burring test was performed by a machining center (MC) at cutting feedrate of F=10 mm/min and rotational speed of n=3500 rpm, using plate specimens of 150×50 mm. A bushing was produced by flowdrill of M6 short type (diameter: D=5.3 mm). Tapping test was performed by a MC at F= 20 mm/min and n= 20 rpm after burring. Burring and tapping tests were measured z-axis loading meter (S) corresponds to thrust and spindle loading meter (T) corresponds to torque, respectively. In addition, we have performed measuring the hardness of the specimen after processing, microstructure observation and fatigue tests.

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