Effect of Carbon Content on Burring and Tapping in Ultrahigh Strength TRIP Sheet Steels
Effect of thermal drilling condition on burring of (0.1-0.4)C-1.5Si-1.5Mn (mass%) ultrahigh strength TRIP-aided sheet steels with polygonal ferrite matrix (TDP steels) was investigated for automotive applications.The combined rotational and downward force of the thermal drilling tool bit created friction heat.The height of the bushing was roughly 3 to 4 times the initial sheet thickness.The bushings are ideal for thread applications,as the strength of threads was significantly increased.We found that the burring and tapping contributed to the improvement of the tensile strength of 980 MPa class TRIP steel.1) A flow drill worked so well on burring of the TDP steels,and make it possible that nuts is not used.As for tapping of the following burring of TDP steel (thickness: 1.2 mm) using M6 short type flowdrill.Nutless became possible by machining center.2) In the use of the hand tap,three kinds of Frordrill made tapping possible.
TRIP Sheet Steel Burring Tapping Thermal Drilling
Akihiko Nagasaka Shun Hasebe Takuya Matsushima Yoshiki Tanaka Koh-ichi Sugimoto Toshio Murakami Tomohiko Hojo
Nagano National College of Technology,716 Tokuma,Nagano,Nagano 381-8550 Japan Shinshu University,4-17-1 Wakasato,Nagano,Nagano 380-8553 Japan Material Design Research Section,Material Research Laboratory,Kobe Steel,Ltd.,1-5-5 Takatsukadai,Nis suyama National College of Technology,624-1 Numa,Tsuyama,Okayama 708-8509 Japan
国际会议
Asia Steel International conference 2012(第五届亚洲钢铁大会)
北京
英文
1-5
2012-09-23（万方平台首次上网日期，不代表论文的发表时间）