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A study on the characterization of shear surface according to shear rate and shear mechanism in high temperature shear process of boron steel  

Jeon, Yong-Jun (Molds & Dies Technology R&D Group, Korea Institute of Industrial Technology)
Choi, Hyun-Seok (Molds & Dies Technology R&D Group, Korea Institute of Industrial Technology)
Lee, Hwan-Ju (Molds & Dies Technology R&D Group, Korea Institute of Industrial Technology)
Kim, Dong-Earn (Molds & Dies Technology R&D Group, Korea Institute of Industrial Technology)
Publication Information
Design & Manufacturing / v.11, no.2, 2017 , pp. 37-41 More about this Journal
Abstract
With light vehicle weight gradually becoming ever more importance due to tightened exhaust gas regulations, hot-stamping processing using boron alloyed steel is being applied more and more by major automobile OEMs since process assures both moldability and a high strength of 1.5 GPa. Although laser trimming is generally applied to the post-processing of the hot-stamped process with high strength, there have been many studies of in-die hot trimming using shear dies during the quenching of material in order to shorten processing times. As such, this study investigated the effects of the Shear rate and Shear mechanism on shear processes during the quenching process of hot-stamping material. In case of pad variable, padding force is very weak compared with shear force, so it does not affect the shear surface. In case of shear rate, the higher the shear at high temperatures and the higher the friction effect. As a result the rollover and the fracture distribution decreased, and the burnish distribution increased. Therefore, it is considered that the shear quality is guaranteed when high shear rate is applied in high temperature shear process.
Keywords
Boron alloyed steel; In-die trimming; Hot stamping; Shear velocity; Warm trimming;
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