Hiroaki Kubota

Nippon Steel (Japan), National Institute of Technology Okinawa College

Papers

Total Citations

H-Index

About

Hiroaki Kubota is a leading innovator in advanced metal forming for the automotive industry, best known for pioneering **Three-Dimensional Hot Bending and Direct Quench (3DQ) technology**. His core research addresses the critical trade-off between vehicle weight reduction and crash safety by developing processes that create ultra-high-strength, hollow tubular components. Kubota’s major contribution is the 3DQ process itself, which integrates induction heating, bending, and rapid quenching to produce parts with a tensile strength of **1470 MPa or more**—far exceeding conventional stamped or cold-bent steel. His foundational 2014 paper (25 citations) established the basic properties of the process, demonstrating how partial quenching can dramatically improve energy absorption in crash tests. Subsequent works in 2015 and 2016 refined the forming characteristics and defined the formable range for complex three-dimensional shapes. While his citation counts reflect a specialized engineering field, the impact of his work is immense: 3DQ technology enables automakers to fabricate lighter, stronger, and more geometrically complex structural parts, directly contributing to improved fuel economy and passenger safety. Kubota’s research represents a significant leap in hot-stamping and tube-bending science, offering a practical solution for next-generation vehicle frames.