scholarly journals A Research on The Formability of PVC Sheet in Single Point Incremental Forming (SPIF) Technology

2021 ◽  
Vol 327 ◽  
pp. 05005
Author(s):  
Nguyen Thanh Nam ◽  
Nguyen Hoang Hiep ◽  
Nguyen Tan Hung ◽  
Tran Trong Hy ◽  
Ho Huu Han
Keyword(s):  
Incremental Forming ◽  
New Technology ◽  
Single Point ◽  
Recent Decade ◽  
Empirical Method ◽  
Innovative Technology ◽  
Single Point Incremental Forming ◽  
Workpiece Material ◽  
Almost All ◽  
Thermoplastic Resins

Nowadays Single Point Incremental Forming (SPIF) is really a new technology of forming metal sheet after its formation and long development in about five decades. Although it was invented in, 1967 by Leszak, an American inventor, but the applications of the innovative technology have just been popular from 1990 because of the advance of controlling technology. This technology is especially adapted to small batch, unique or single productions. In almost all cases, the workpiece material sheets are metal such as aluminum alloys, bronze, mild steel, stainless steel and even Titanium with lot of researches, papers and thesis... Nonmetal sheets are rarely applied in this technology because of rare application. Nowadays, on the rise of the development of composite materials such as, PVC, thermoplastic resins... that have been a lot of applications on living life and technology. In this paper, we dedicate all of our work in the examination some parameters of forming that influence on the deformable ability of PVC plastic by empirical method under the support of DOE and Minitab software. This paper also provides our own experiences in forming PVC sheet that we had performed in the recent decade.

Analytical Computing Stresses and Strains in Single Point Incremental Forming

2019 ◽  
Vol 825 ◽  
pp. 129-139
Author(s):  
Le Khanh Dien ◽  
Le Khanh Tan ◽  
Van Thanh Nguyen ◽  
Huy Bich Nguyen ◽  
Thanh Nam Nguyen
Keyword(s):  
Incremental Forming ◽  
New Technology ◽  
Single Point ◽  
Fem Simulation ◽  
Recent Decade ◽  
Analytical Framework ◽  
Single Point Incremental Forming ◽  
Normal Stresses ◽  
Forming Technology ◽  
Almost All

Nowadays, Single Point Incremental Forming (SPIF) has become popular for metal sheet forming technology in industry in many advanced countries. In the recent decade, many relative studies have concentrated on this new technology of forming sheet by Finite Element Method (FEM) as well as by empirical way. There were very rare studies by pure analytical computing and P.A.F. Martins et al. under a title “Theory of single point incremental forming” performed almost all these researches were based on the analytical framework of SPIF in 2008. After careful studying on this research, we found out its light illogical result: the stresses inside of a random point in the workpiece sheet are constant and not related to the coordinate of the formed point of the sheet. Therefore, it cannot explain the mechanism of rupture and tear of the sheet that is really a serious restriction of the SPIF technology nowadays. This paper dedicates to suggest a new version of pure analytical computing the normal stresses at a random formed point in the sheet that could explain the tear mechanism and a FEM simulation was also carried out also to prove the conviction of the recommended formula.

scholarly journals A recommendation of computation of normal streeses in single point incremental forming technology

2014 ◽  
Vol 17 (1) ◽  
pp. 21-28
Author(s):  
Dien Khanh Le ◽  
Nam Thanh Nguyen ◽  
Binh Thien Nguyen
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Incremental Forming ◽  
Single Point ◽  
Finite Element Method Simulation ◽  
Recent Decade ◽  
Work Piece ◽  
Single Point Incremental Forming ◽  
Forming Technology ◽  
Element Method

Single Point Incremental Forming (SPIF) has become popular for metal sheet forming technology in industry in many advanced countries. In the recent decade, there were lots of related studies that have concentrated on this new technology by Finite Element Method as well as by empirical practice. There have had very rare studies by pure analytical theory and almost all these researches were based on the formula of ISEKI. However, we consider that this formula does not reflect yet the mechanics of destruction of the sheet work piece as well as the behavior of the sheet in reality. The main aim of this paper is to examine ISEKI’s formula and to suggest a new analytical computation of three elements of stresses at any random point on the sheet work piece. The suggested formula is carefully verified by the results of Finite Element Method simulation.

scholarly journals A study of the ability of the deformation of titanium sheet by hot single point incremental forming technology

2017 ◽  
Vol 20 (K6) ◽  
pp. 14-21 ◽  
Author(s):  
Hy Trong Tran ◽  
Hung Tan Nguyen ◽  
Tuyen Vo ◽  
Dien Khanh Le ◽  
Hoang Huy Pham ◽  
...  
Keyword(s):  
Computer Aided Design ◽  
Incremental Forming ◽  
New Technology ◽  
Single Point ◽  
High Strength ◽  
Simulation Method ◽  
Single Point Incremental Forming ◽  
Titanium Sheet ◽  
Fea Model ◽  
Tool Diameter

Hot Single Point Incremental Forming (HOT SPIF) is a new technology of forming a metal sheet at high temperatures, especially for hard, high strength materials that are difficult to perform at normal temperatures such as Titanium and other materials. The paper presents the application of simulation method to determine the ability of the deformation of Titanium sheet through the angle of deformation αmax of the lateral profile of the model under the influence of tool diameter D (mm), step in the direction z of the tool VZ (mm), the velocity of the tool Vxy (mm/min), the temperature T(0C). The content of this paper consists of the analyzing the influence of these 4 above parameters by building a finite element analyzing (FEA) model to determine the ability of deformation or the maximum lateral angle of forming and to compare the accuracy of FEM model to the one of Computer-aided design (CAD) model. The paper studies the influences of the 4 parameters to the ability to form of Titanium sheet by HOT SPIF.

Recommendation of a Measure for Enhancing the Precision of Dimensions of Foil Products in Single Point Incremental Forming Technology

2015 ◽  
Vol 656-657 ◽  
pp. 479-483 ◽  
Author(s):  
Khanh Dien Le ◽  
Tan Hung Nguyen ◽  
Thien Binh Nguyen ◽  
Thanh Son Le ◽  
Huy Bich Nguyen ◽  
...  
Keyword(s):  
Feed Rate ◽  
Incremental Forming ◽  
Single Point ◽  
Single Point Incremental Forming ◽  
Forming Technology ◽  
Sheet Materials ◽  
Forming Parameters ◽  
Plastic Materials ◽  
Almost All

Single Point Incremental Forming (SPIF) has become a popular technology of forming sheet materials in the recent decades. However, the springback phenomenon, an inborn property of almost all elasto-plastic materials, reduces the precision of dimensions of the products by the finished forming session. This paper attempts to find out a measure to minimize this unwanted obstacle by using both empirical and simulating methods in order to define the relations of springback values among the forming parameters such as diameter of the forming tool, its revolution per minute, its velocity and its feed rate. Analyzing these equations to extract the appropriate parameters of forming for enhancing the precision of SPIF products is the final aim of this paper.

scholarly journals Influence of Lubrication and Cooling on the Quality of Single-Point Incremental Forming Parts of Polycarbonate Sheets

2021 ◽  
Vol 5 (3) ◽  
pp. 75
Author(s):  
Irina Beșliu-Băncescu ◽  
Laurențiu Slătineanu ◽  
Oana Dodun ◽  
Gheorghe Nagîț
Keyword(s):  
Incremental Forming ◽  
Single Point ◽  
Dimensional Accuracy ◽  
Thermal Processes ◽  
Single Point Incremental Forming ◽  
Workpiece Material ◽  
High Productivity ◽  
Independent Variables ◽  
Full Factorial

Without ensuring high productivity, single-point incremental forming allows obtaining cavities in sheet-type workpieces by rotating and moving a rotary forming tool along a predetermined path. The process can be used in the case of both metal and plastic sheets. The heat generated in the processing area is expected to cause different elongations and contractions, affecting the final dimensional accuracy of the surfaces obtained. A full factorial experiment with three independent variables at two levels was used to investigate the correlations between the values of some of the process input factors and the results of thermal processes developed at the contact between the rotating tool and the workpiece. Experimental research was performed in dry single-point incremental forming, using lubricants and, respectively, with the generation of a decrease in temperature by the use of coolants. Empirical mathematical models were determined, and they confirmed the influence of the values of considered input factors on the thermal processes developed at the contact between the tool and the workpiece material. Temperatures of up to 147 °C were recorded in the processing area of the plastic workpiece.

scholarly journals A research on a new structure of forming tool in Single Point Incremental Forming (SPIF)

2020 ◽  
Vol 3 (SI1) ◽  
pp. SI157-SI163
Author(s):  
Le Khanh Dien ◽  
Nguyen Van Thanh ◽  
Nguyen Tan Hung
Keyword(s):  
Incremental Forming ◽  
Spherical Surface ◽  
Sheet Material ◽  
Single Point ◽  
Tangential Velocity ◽  
Metal Sheet ◽  
Innovative Technology ◽  
Single Point Incremental Forming ◽  
Spherical Tool ◽  
The Revolution

Single Point Incremental Forming (SPIF) is really a new technology of forming metal sheet nowadays and in recent decades. Although it was invented in, 1967 by Lezak, an American inventor, but the applications of the innovative technology were broad from 1990 because of the advance of controlling technology. This technology is especially adapted to small batch, unique or single productions. There are many forming parameters that influence to the formability of the metal sheet workpiece such as diameter of tool, the revolution per minute of the tool tip, the vertical feed rate after each orbit, the velocity of tool in horizontal plane…. Among of them, in our own experiences, we recognize that in almost all cases, the revolution per minute of the forming tool when forming ferric material sheet such as mild steel, stainless steel, hard steels… should be as small as possible to get the biggest ability of deformation of the workpiece sheet to get rid of failure on the lateral edge of the sheet. The tangential velocity of forming point on the spherical tool tip should be selected to attain the situation of rolling but no sliding of the surface of the spherical tool on the one of the sheet material. The paper recommends a new version of a forming tool in which the tip of the tool is a very hard ball (such as the quenched ball in a ball bearing) that is freely rotate by the friction to modify the contact point on the spherical surface of the tool to avoid the abrading and keep the spherical shape and the situation of rotating but no sliding on the surface of the workpiece sheet as mentioned above. The manufacture of the innovative forming tool is performed and then empirical processes verified it. The models formed by the typical tool are better in comparison with the ones of normal forming tool.

scholarly journals A CALCULATION FOR COMPENSATING THE ERRORS DUE TO SPRINGBACK WHEN FORMING METAL SHEET BY SINGLE POINT INCREMENTAL FORMING (SPIF)

2010 ◽  
Vol 13 (3) ◽  
pp. 14-24
Author(s):  
Nam Thanh Nguyen ◽  
Cuong Van Vo ◽  
Dien Khanh Le ◽  
Sy Van Le
Keyword(s):  
Sheet Metal Forming ◽  
Metal Forming ◽  
Incremental Forming ◽  
Single Point ◽  
Metal Sheet ◽  
Single Point Incremental Forming ◽  
Real Situation ◽  
The World ◽  
Feeding Value ◽  
Almost All

The question of compensating for the error of dimension due to springback phenomenon when forming metal sheet by SPIF method is being one of the challenges that the researchers of SPIF in the world trying to solve. This paper is only a recommendation that is based on the macro analysis of a sheet metal forming model when machining by SPIF method for calculating a reasonable recompensated feeding that almost all researchers have not been interested in yet: - Considering the metal sheet workpiece is elasto-plastic and the sphere tool tip is elastic, the authors attempt to calculate for compensating the error of dimension due to elastic deforming of the tool tip. - The metal sheet is clamped by a cantilever joint that has an evident sinking at the machiningarea that is also calculated to add to the compensating feeding value. The paper also studies the limited force for ensuring the elastic deforming at these working area of the sheet to eliminate all theunexpected plastic deforming of the sheet. With two small but novel contributions, this study can help to take theoretical model for elastic forming of metal sheet closer to real situation.

Improve the Micro-hardness of Single Point Incremental Forming Product Using Magnetic Abrasive Finishing

2020 ◽  
Vol 38 (8A) ◽  
pp. 1137-1142
Author(s):  
Baqer A. Ahmed ◽  
Saad K. Shather ◽  
Wisam K. Hamdan
Keyword(s):  
Vickers Hardness ◽  
Feed Rate ◽  
Incremental Forming ◽  
Single Point ◽  
Single Point Incremental Forming ◽  
Step Size ◽  
Coil Current ◽  
Magnetic Abrasive Finishing ◽  
Finishing Process ◽  
Abrasive Finishing

In this paper the Magnetic Abrasive Finishing (MAF) was utilized after Single Point Incremental Forming (SPIF) process as a combined finishing process. Firstly, the Single Point Incremental forming was form the truncated cone made from low carbon steel (1008-AISI) based on Z-level tool path then the magnetic abrasive finishing process was applied on the surface of the formed product. Box-Behnken design of experiment in Minitab 17 software was used in this study. The influences of different parameters (feed rate, machining step size, coil current and spindle speed) on change in Micro-Vickers hardness were studied. The maximum and minimum change in Micro-Vickers hardness that achieved from all the experiments were (40.4 and 1.1) respectively. The contribution percent of (feed rate, machining step size, coil current and spindle speed) were (7.1, 18.068, 17.376 and 37.894) % respectively. After MAF process all the micro surface cracks that generated on the workpiece surface was completely removed from the surface.

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