Development of Manufacturing Process Using Cold Incremental Forming Technique for Micro-Alloyed Non-Heat-Treated Material

Abstract

A micro-alloyed non-heat-treated material does not need post heat treatment processes such as quenching and tempering after the forming process in production stages. This material can be called a green material since it can reduce industrial costs and harmful pollutants generated from post heat treatments. In this paper, near-net-shape forming processes were studied in order to make an automotive part using a micro-alloyed material. The cold forging technique using a former was utilized for the main shaping, and the cold incremental forming technique using a cross wedge rolling machine was adopted for the enhancement of strength and the final shaping of the part. In order to get more adequate process, the cross wedge rolling process is compared to the swaging process for the micro-alloyed steel and general carbon steels through experiments.

Optimization of design parameters using a response surface method in a cold cross-wedge rolling

“…1 shows dominant design variables of the CWR process. Main design variables of CWR process are forming angle (shoulder angle), spreading angle (stretching angle) and area reduction ratio (Lee et al, 2006). In case of hot working, a proper value of the forming angle is about 30 • and a value of spreading angle is usually set within the range from 8 • to 11 • .…”

“…ufacture cold forged micro-alloyed products such as ball stud component (Lee et al, 2006). Cross-wedge rolling (CWR) process is the specialized incremental forming process to make axisymmetric products.…”