Experimental and numerical study on optimization of the single point incremental forming of AINSI 304L stainless steel sheet

Abstract

Abstract. AINSI 304L stainless steel sheets are commonly formed into a variety of shapes for applications in the industrial, architectural, transportation and automobile fields, it's also used for manufacturing of denture base. In the field of dentistry, there is a need for personalized devises that are custom made for the patient. The single point incremental forming process is highly promising in this area for manufacturing of denture base.The single point incremental forming process (ISF) is an emerging process based on the use of a spherical tool, which is moved along CNC controlled tool path. One of the major advantages of this process is the ability to program several punch trajectories on the same machine in order to obtain different shapes. Several applications of this process exist in the medical field for the manufacturing of personalized titanium prosthesis (cranial plate, knee prosthesis…) due to the need of product customization to each patient.The objective of this paper is to study the incremental forming of AISI 304L stainless steel sheets for future applications in the dentistry field. During the incremental forming process, considerable forces can occur. The control of the forming force is particularly important to ensure the safe use of the CNC milling machine and preserve the tooling and machinery.In this paper, the effect of four different process parameters on the maximum force is studied. The proposed approach consists in using an experimental design based on experimental results. An analysis of variance was conducted with ANOVA to find the input parameters allowing to minimize the maximum forming force. A numerical simulation of the incremental forming process is performed with the optimal input process parameters. Numerical results are compared with the experimental ones.

A Novel Machine-Learning-Based Procedure to Determine the Surface Finish Quality of Titanium Alloy Parts Obtained by Heat Assisted Single Point Incremental Forming

“…Precision is used to obtain the percentage of correct predictions in every class, meaning the degree of reliability, while recall is used to represent the fraction of samples which were correctly recognized, that is, the model's detection capability. Both measures were calculated using Equations ( 4) and (5). In these equations, TP (True Positive) refers the number of predictions where the classifier correctly predicts the positive class as positive, TN (True negative) indicates the number of predictions where the classifier correctly predicts the negative class as negative, FP (False Positive) depicts the samples incorrectly associated with a class, and FN (False Negative) represents the experiments belonging to a specific class that were wrongly labelled.…”

“…The process has been applied to commercial copper, some aluminum alloys, and high formability mild steel. Some application with stainless steel AISI 304 has been also reported [5]. With regard to titanium alloys, research is mainly recent, and it supposes that their application has the most potential.…”

Simulation-Based Process Design for Asymmetric Single-Point Incremental Forming of Individual Titanium Alloy Hip Cup Prosthesis

“…Forming geometric models with complex shapes, on the other hand, is still researched. Several experimental and numerical studies were conducted to investigate parameters impacting this process for various metals [ 14 , 35 ]. The incremental forming procedure used in the suggested approach allows for the creation of a custom prosthesis for each patient, rendering it more comfortable and ensuring greater performance.…”

Experimental and numerical study on warm single-point incremental sheet forming (WSPIF) of titanium alloy Ti–6Al–4V, using cartridge heaters

“…During the incremental forming process, the sheet blank is fixed by a blank holder. The punch follows a programmed tool path with vertical axis step size and progressively deforms the sheet [2].…”