Company Filing History:
1 out of 12 
1 out of 1,100 Years Active: 1992
Title: Hiroyoshi Yamakawa: Innovator in High-Strength Automotive Parts
Introduction
Hiroyoshi Yamakawa is a notable inventor based in Fuji, Japan. He has made significant contributions to the field of automotive engineering, particularly in the manufacturing of high-strength parts for automobiles. His innovative approach has led to the development of a patented process that enhances the performance and durability of automotive components.
Latest Patents
Yamakawa holds a patent for a process for manufacturing high-strength parts of an automobile. This process involves creating steel with specific chemical compositions, including carbon, silicon, manganese, aluminum, copper, nickel, niobium, and calcium. The steel is heated to temperatures between 1100°C to 1250°C and hot rolled. The resulting hot-rolled steel is coiled at temperatures of 350°C to 500°C, producing a steel sheet with a tensile strength not exceeding 65 kgf/mm². This sheet is then cold worked until a working strain of at least 15% is achieved. Finally, the cold-worked product is heated at temperatures of 400°C to 550°C for a duration of 0.5 to three hours, yielding a part with a tensile strength of at least 80 kgf/mm², particularly suitable for an automobile's automatic transmission system.
Career Highlights
Throughout his career, Yamakawa has worked with several prominent companies, including Yamakawa Industrial Co. and Kobe Steel, Ltd. His expertise in materials science and engineering has positioned him as a key figure in the development of advanced automotive technologies. His work has not only contributed to the automotive industry but has also set new standards for manufacturing high-strength materials.
Collaborations
Yamakawa has collaborated with notable colleagues, including Tsunahiro Yamakawa and Satoru Nito. These collaborations have further enhanced his research and development efforts, leading to innovative solutions in automotive engineering.
Conclusion
Hiroyoshi Yamakawa's contributions to the field of automotive engineering through his patented processes have significantly impacted the industry. His dedication to innovation and collaboration continues to drive advancements in high-strength automotive parts.