Study of the Hardening in Middle Shaft During Cold Forging

Abstract

Abstract Cold forging is a common processing method. It is fast, precise, and produces high strength. The purpose of this study was to process products by using a cold-forging technique. This study is aimed at achieving hardness of a certain standard without using heat treatment; computer-aided engineering (CAE) analyses were conducted with different diameter settings but the same methods and molds. Tests were conducted to understand the influence of the changes in material diameters on their material hardness values. We expected to produce workpieces of a specific hardness at the lowest cost. An actual cold forging case was conducted. First, Deform-3D (finite element analysis software) was utilized to conduct a computer-aided engineering forging analysis. How the internal stress distribution and equipment output tonnage changed as the diameter of the material changed was observed and compared against the actual hardness. This study discovered that the location where large elastic deformation occurred (i.e., where the stress concentration occurred), the hardness of the cold forging piece at that location increased. The simulation and experiment results revealed that a large area reduction rate of the intermediate shaft formation resulted in dense forging streamlines, high hardness, and substantial hardening effects.