Yoshihisa Doi

Title: The Innovative Contributions of Yoshihisa Doi

Introduction

Yoshihisa Doi is a prominent inventor based in Utsunomiya, Japan. He has made significant contributions to the field of manufacturing, particularly in the development of advanced machinery and methods. With a total of 12 patents to his name, Doi's work has had a lasting impact on various industries.

Latest Patents

One of Doi's latest patents is a method of and apparatus for manufacturing shafts. This innovative shaft manufacturing apparatus includes a first drawing die with a cylindrical first cavity that is open at both ends, and a second drawing die with a cylindrical second cavity that is open at one end. The design features an angle between the first tapered part of the first drawing die and the axis of the first cavity that is greater than the angle formed between the second tapered part of the second drawing die and the axis of the second cavity.

Another notable patent is a method of manufacturing an outer ring member for a constant velocity joint. This method involves several steps, including forming a secondary molding by applying a preliminary upsetting to a workpiece after a forward extrusion-molding process. The process continues with the formation of intermediate pre-molded bodies that have annular sloped surfaces, which create a difference in flow resistance between large and small diameter parts. The final steps include applying a backward extrusion-molding to create a cup part with track grooves and finishing the quaternary molding to product dimensions through ironing.

Career Highlights

Throughout his career, Yoshihisa Doi has worked with notable companies such as Honda Giken Kogyo Kabushiki Kaisha and Honda Motor Co., Ltd. His experience in these organizations has allowed him to refine his skills and contribute to groundbreaking innovations in manufacturing technology.

Collaborations

Doi has collaborated with several talented individuals, including Yuichi Nagao and Tsukashi Ohama. These partnerships have fostered a creative environment that has led to the development of innovative solutions in the field.

Conclusion

Yoshihisa Doi's contributions to the field of manufacturing through his patents and collaborations highlight his role as a significant inventor. His innovative methods and apparatuses continue to influence the industry and inspire future advancements.