This study focuses on developing Spur Gear parts for electric hedge trimmers using precision cold forging technology. The existing product faced lifespan and quality issues, leading to frequent replacements and increased costs. To address these problems, we implemented a three-stage cold forging process, which enhances product durability and reduces expenses. Previously, Spur Gear parts were produced using traditional machining methods, including CNC machining, gear hobbing, and MCT machining. However, these methods resulted in frequent damage, contributing to higher costs. By transitioning to a three-stage cold forging process, we aim to significantly improve the lifespan of the product.

This study aimed to develop automotive radiator support parts by applying the press forming/drawing mold technology of 440 MPa high-tensile steel sheets. It is intended to develop a shape structure that does not generate shape and positional accuracy, deformation, wrinkles, or cracks by maintaining strong contact surface pressure on both sides of the blank material and freezing elastic recovery stress. Therefore, quality improvement and high productivity were secured by applying the forming/drawing method of high-strength steel sheets to the radiator support parts.

Steering Stop parts constituting the suspension system of automobiles are located inside an automobile suspension. They are used to fix upper and lower suspension arm parts by welding. The purpose of this study was to develop Steering Stop parts for automobile suspension. Cost increase due to problem of existing tool life is a challenging issue. This study tries to solve the tool life problem and reduce the cost using a former cold forging complex forming technology. We developed a long-life complex forming technology between multistage former forging and cold forging for producing Steering Stop parts of automobile suspension.