Location History:
- Hiratsuka, JP (1991 - 2000)
- Kanagawa, JP (1995 - 2003)
Company Filing History:
Years Active: 1991-2003
Title: Kiyoshi Hirakawa: Innovator in Rolling Shaft Technology
Introduction
Kiyoshi Hirakawa is a prominent inventor based in Kanagawa, Japan. He has made significant contributions to the field of mechanical engineering, particularly in the development of rolling shaft technologies. With a total of 12 patents to his name, Hirakawa's work has had a lasting impact on the industry.
Latest Patents
Hirakawa's latest patents include innovative designs that enhance the performance and durability of rolling shafts. One of his notable inventions is a rolling shaft made by high-frequency quenching. This rolling shaft is composed of steel containing 0.5 to 1.2 wt % carbon and features a surface layer with 0.05 to 0.4 wt % nitrogen. The high-frequency quenching process results in a Vickers hardness of Hv650 or more, with a residual austenite content of 15 to 40 vol %. The core portion of the rolling shaft contains 0 vol % of the residual austenite, ensuring optimal performance.
Another significant patent is the corrective tempering apparatus for rolling elements. This method allows for the rapid correction of thermal deformation in rolling elements made of steel. By utilizing low-temperature tempering, the hardened rolling element is heated and pressured to a maximum temperature between 250 to 500 °C. This process can achieve a correction time within 6 minutes and an induction heating time within 30 seconds, resulting in a product with a correcting degree of deformation of 60% or more and a surface roughness of less than Ra 0.2 µm.
Career Highlights
Throughout his career, Kiyoshi Hirakawa has worked with notable companies such as NSK Corporation and Nippon Seiko Kabushiki Kaisha. His experience in these organizations has allowed him to refine his skills and contribute to groundbreaking innovations in the field.
Collaborations
Hirakawa has collaborated with esteemed colleagues, including Akira Suzuki and Jiami Pu. These partnerships have fostered a creative environment that has led to the development of advanced technologies in rolling shaft applications.
Conclusion
Kiyoshi Hirakawa's contributions to the field of mechanical engineering, particularly in rolling shaft technology, have established him as a leading inventor. His innovative patents and collaborations continue to influence the industry, showcasing the importance