Investigations on the forming characteristics of a novel flexible incremental sheet forming method for low-ductility metals at room temperature

2021 ◽  
pp. 117456
Author(s):  
Zhidong Chang ◽  
Jun Chen
Keyword(s):  
Room Temperature ◽  
Sheet Forming ◽  
Incremental Sheet Forming ◽  
Forming Characteristics

Process capabilities of commercially pure titanium grade 2 formed through warm incremental sheet forming

2021 ◽  
pp. 095440542199566
Author(s):  
Pavan Kumar ◽  
Puneet Tandon
Keyword(s):  
Room Temperature ◽  
Fe Simulation ◽  
Pure Titanium ◽  
Sheet Forming ◽  
Incremental Sheet Forming ◽  
Forming Limit ◽  
Commercially Pure Titanium ◽  
Wall Angle ◽  
Commercially Pure ◽  
Cp Ti

Commercially pure titanium (CP-Ti) Grade-2 has many applications due to its good weldability, strength, ductility, formability, and superior corrosion resistance. Although, CP-Ti Grade-2 can be formed at room temperature, however, it has lower ductility at room temperature. Therefore, heat treatment or thermal activation is required to increase its ductility and formability. In this paper, the process capabilities of CP-Ti Grade-2 to form the components through warm incremental sheet forming (ISF) has been investigated. To identify the optimal temperature at which CP-Ti Grade-2 sheets can be incrementally formed, straight groove tests were performed experimentally at various temperatures. Two geometries, namely, varying wall angle truncated cone, and constant wall angle truncated cone were used as test cases to evaluate the formability of CP-Ti Grade-2, in terms of limiting wall angle. The formability was also assessed through forming limit diagram obtained by Finite Element (FE) simulation. With forming limit damage criterion, fracture in the formed component was predicted with FE simulation using Abaqus Explicit software. To assess the process capabilities of CP-Ti Grade-2 sheet formed through warm ISF, thickness distribution, forming forces, geometrical accuracy, and surface roughness were analyzed through both FE simulation and experimental work.

Evaluating Material Constitutive Equations for the Simulation of Incremental Sheet Forming Applied to Form Thermoplastic Materials

2013 ◽  
Vol 554-557 ◽  
pp. 1312-1319 ◽  
Author(s):  
Isabel Bagudanch ◽  
Alex Elías-Zúñiga ◽  
Maria Luisa García-Romeu
Keyword(s):  
Constitutive Equations ◽  
Room Temperature ◽  
Sheet Forming ◽  
Glassy Polymers ◽  
Incremental Sheet Forming ◽  
Manufacturing Cost ◽  
Uniaxial Test ◽  
Material Parameters ◽  
Tremendous Amount ◽  
Future Work

Incremental Sheet Forming (ISF) is able to produce highly customized products at a reasonable manufacturing cost and it has gain importance in the last years, becoming the focus of interest for many researchers and institutions. Some recent publications have revealed an increasing interest in forming thermoplastic materials. There is a tremendous amount of effort put in developing a model that may describe the equilibrium hysteresis and rate-dependence of thermoplastic materials in ISF. This paper will present a brief review of the most common constitutive equations that are able to model the behaviour of glassy polymers. It will be shown that by using a small number of material parameters defined in the Marlow model, it is possible to accurately predict experimental data collected on samples of PVC subjected to simple uniaxial test performed at room temperature. Additionally, some parts have been formed with ISF in order to verify whether the material is incompressible or not. It can be concluded that Marlow model might be used in future work to model the ISF manufacturing process.

Multiobjective optimization of process variables in single-point incremental forming using grey relational analysis coupled with entropy weights

2021 ◽  
pp. 146442072110204
Author(s):  
Abdulmajeed Dabwan ◽  
Adham E Ragab ◽  
Mohamed A Saleh ◽  
Atef M Ghaleb ◽  
Mohamed Z Ramadan ◽  
...  
Keyword(s):  
Grey Relational Analysis ◽  
Incremental Forming ◽  
Single Point ◽  
Sheet Forming ◽  
Incremental Sheet Forming ◽  
Numerical Control ◽  
Single Point Incremental Forming ◽  
Process Variables ◽  
Relational Analysis ◽  
Grey Relational

Incremental sheet forming is a specific group of sheet forming methods that enable the manufacture of complex parts utilizing computer numerical control instead of specialized tools. It is an incredibly adaptable operation that involves minimal usage of sophisticated tools, dies, and forming presses. Besides its main application in the field of rapid prototyping, incremental sheet forming processes can be used for the manufacture of unique parts in small batches. The goal of this study is to broaden the knowledge of the deformation process in single-point incremental forming. This work studies the deformation behavior in single-point incremental forming by experimentally investigating the principal stresses, principal strains, and thinning of single-point incremental forming products. Conical-shaped components are fabricated using AA1050-H14 aluminum alloy at various combinations of fundamental variables. The factorial design is employed to plan the experimental study and analysis of variance is conducted to analyze the results. The grey relational analysis approach coupled with entropy weights is also implemented to identify optimum process variables for single-point incremental forming. The results show that the tool diameter has the greatest effect on the thinning of the SPIF product, followed by the sheet thickness, step size, and feed rate.

The influence of ultrasonic vibration on parts properties during incremental sheet forming

2021 ◽  
Author(s):  
Yan-Le Li ◽  
Zi-Jian Wang ◽  
Wei-Dong Zhai ◽  
Zi-Nan Cheng ◽  
Fang-Yi Li ◽  
...  
Keyword(s):  
Ultrasonic Vibration ◽  
Sheet Forming ◽  
Incremental Sheet Forming

scholarly journals Development of novel tools for electricity-assisted incremental sheet forming of titanium alloy

2015 ◽  
Vol 85 (5-8) ◽  
pp. 1137-1144 ◽  
Author(s):  
Runze Liu ◽  
Bin Lu ◽  
Dongkai Xu ◽  
Jun Chen ◽  
Fei Chen ◽  
...  
Keyword(s):  
Titanium Alloy ◽  
Sheet Forming ◽  
Incremental Sheet Forming

scholarly journals An efficient method for thickness prediction in multi-pass incremental sheet forming

2014 ◽  
Vol 77 (1-4) ◽  
pp. 469-483 ◽  
Author(s):  
Tingting Cao ◽  
Bin Lu ◽  
Dongkai Xu ◽  
Huan Zhang ◽  
Jun Chen ◽  
...  
Keyword(s):  
Efficient Method ◽  
Sheet Forming ◽  
Incremental Sheet Forming ◽  
Thickness Prediction

Experimental and Numerical Analysis of Forming Limits in CNC Incremental Sheet Forming

2007 ◽  
Vol 344 ◽  
pp. 511-518 ◽  
Author(s):  
Markus Bambach ◽  
M. Todorova ◽  
Gerhard Hirt
Keyword(s):  
Sheet Metal ◽  
Sheet Forming ◽  
Incremental Sheet Forming ◽  
Negative Slope ◽  
Evaluation Procedure ◽  
Forming Limit ◽  
Limit Curve ◽  
Forming Limit Curve ◽  
Forming Limits ◽  
Straight Line

Asymmetric incremental sheet forming (AISF) is a relatively new manufacturing process for the production of low volumes of sheet metal parts. Forming is accomplished by the CNC controlled movements of a simple ball-headed tool that follows a 3D trajectory to gradually shape the sheet metal blank. Due to the local plastic deformation under the tool, there is almost no draw-in from the flange region to avoid thinning in the forming zone. As a consequence, sheet thinning limits the amount of bearable deformation, and thus the range of possible applications. Much attention has been given to the maximum strains that can be attained in AISF. Several authors have found that the forming limits are considerably higher than those obtained using a Nakazima test and that the forming limit curve is approximately a straight line (mostly having a slope of -1) in the stretching region of the FLD. Based on these findings they conclude that the “conventional” forming limit curves cannot be used for AISF and propose dedicated tests to record forming limit diagrams for AISF. Up to now, there is no standardised test and no evaluation procedure for the determination of FLCs for AISF. In the present paper, we start with an analysis of the range of strain states and strain paths that are covered by the various tests that can be found in the literature. This is accomplished by means of on-line deformation measurements using a stereovision system. From these measurements, necking and fracture limits are derived. It is found that the fracture limits can be described consistently by a straight line with negative slope. The necking limits seem to be highly dependent on the test shapes and forming parameters. It is concluded that standardisation in both testing conditions and the evaluation procedures is necessary, and that a forming limit curve does not seem to be an appropriate tool to predict the feasibility of a given part design.

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