Improvement of dimensional accuracy based on multistage single point incremental forming of a straight wall cylinder part

2017 ◽  
Vol 18 (9) ◽  
pp. 1281-1286 ◽  
Author(s):  
Zhengfang Li ◽  
Shihong Lu ◽  
Peng Chen
Keyword(s):  
Incremental Forming ◽  
Single Point ◽  
Dimensional Accuracy ◽  
Single Point Incremental Forming ◽  
Straight Wall

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 Achieving Accuracy Improvements for Single-Point Incremental Forming Process Using a Circumferential Hammering Tool

Metals ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 482
Author(s):  
Daniel Nasulea ◽  
Gheorghe Oancea
Keyword(s):  
Mathematical Models ◽  
Incremental Forming ◽  
Single Point ◽  
Dimensional Accuracy ◽  
Machining Accuracy ◽  
Single Point Incremental Forming ◽  
Forming Process ◽  
Wall Area ◽  
Forming Tools ◽  
Full Factorial

The paper presents a novel solution for improving the accuracy of the wall area of parts manufactured by single point incremental forming. Thus, a forming tool with a special design that works according to the principle of circumferential hammering is deployed, with a direct improving effect of the forming conditions and consequently of the dimensional accuracy of the part. The research is focused on an experimental study of frustum-of-cone shapes manufactured from sheet metal blanks of DC05 deep drawing steel of 1 mm thickness. A typical customary technological setup is used for the single point incremental forming process, without any additional elements, and two forming tools, a hemispherical and a special one, which use the circumferential hammering effect. Several preliminary tests using both tools were performed in order to prove that part accuracy can be significantly improved by using the circumferential hammering tool. The research was further expanded to investigate the influence on part wall dimensional accuracy of three factors: tool spindle speed, tool feed rate and part dimensional configuration. Using a full factorial plan of experiments the results of 32 test runs were processed. All parts were machined adequately, free of any material fracturing. Based on the achieved machining accuracy of the part walls, precision mathematical models were developed for the prediction of part dimensional accuracy in those areas. The mathematical models were validated by practice, as the predicted accuracies were matched by the experimental results.

Achieving maximum dimensional accuracy and surface quality at the shortest possible time in single-point incremental forming via multi-objective optimization

2018 ◽  
Vol 233 (3) ◽  
pp. 900-913 ◽  
Author(s):  
Abolfazl Taherkhani ◽  
Ali Basti ◽  
Nader Nariman-Zadeh ◽  
Ali Jamali
Keyword(s):  
Surface Quality ◽  
Sheet Metal ◽  
Incremental Forming ◽  
Single Point ◽  
Dimensional Accuracy ◽  
Numerical Control ◽  
Single Point Incremental Forming ◽  
Multi Objective Optimization ◽  
Multi Objective ◽  
Design Variables

Single-point incremental forming is a novel and flexible method for producing three-dimensional parts from metal sheets. Although single-point incremental forming is a suitable method for rapid prototyping of sheet metal components, there are limitations and challenges facing the commercialization of this process. Dimensional accuracy, surface quality, and production time are of vital importance in any manufacturing process. The present study is aimed at selecting proper forming parameters to produce sheet metal parts which possess dimensional accuracy and good surface quality at the shortest time. Four parameters (i.e. tool diameter, tool step depth, sheet thickness, and feed rate) are chosen as design variables. These parameters are used for the modeling of the process using Group Method of Data Handing(GMDH) artificial neural networks. The data necessary for establishing empirical models are obtained from single-point incremental forming experiments carried out on a computer numerical control milling machine using central composite design. After the evaluation of the model accuracy, single- and multi-objective optimization are performed via genetic algorithm. The performance of the design variables of a tradeoff point corresponding to one of the experiments shows the efficiency and accuracy of the models and the optimization process. Considering the priorities of objective functions, a designer will be able to set proper process parameters.

Evaluation of the dimensional accuracy in single point incremental forming

2013 ◽  
Author(s):  
R. Araújo ◽  
M. B. Silva ◽  
L. Montanari ◽  
P. Teixeira ◽  
A. Reis ◽  
...  
Keyword(s):  
Incremental Forming ◽  
Single Point ◽  
Dimensional Accuracy ◽  
Single Point Incremental Forming

scholarly journals Experimental Study the Effect of Tool Geometry on Dimensional Accuracy in Single Point Incremental Forming (SPIF) Process

2018 ◽  
Vol 21 (1) ◽  
pp. 108 ◽  
Author(s):  
Aqeel Sabree Bedan ◽  
Halah Ali Habeeb
Keyword(s):  
Incremental Forming ◽  
Single Point ◽  
Dimensional Accuracy ◽  
Numerical Control ◽  
Tool Geometry ◽  
Single Point Incremental Forming ◽  
Forming Process ◽  
Wall Angle ◽  
Product Profile ◽  
Tool Diameter

Incremental forming is a flexible sheet metal forming process which performed by utilizes simple tools to locally deform a sheet of metal along a predefined tool path without using of dies. One limitations of single point incremental forming (SPIF) process is the error occur between the CAD design and the product profile. This work presents the single point incremental forming process for produced pyramid geometry and studied the effect of tool geometry, tool diameter, wall angle, and spindle speed on the dimensional accuracy. Three geometries of forming tools were used in experimental work: ball end tool, hemispherical tool, and flat with round corner tool. The sheet material used was pure Aluminum (Al 1050) with thickness of (0.9 mm). The experimental tests in this work were done on the computer numerical control (CNC) vertical milling machine. The products dimensions were measured by utilized the dimensional sensor measuring instrument. The extracted results from the single point incremental forming process indicated the best acceptance between the CAD profile and product profile was found with the ball end tool and diameter of (10 mm), wall angle (50°) and the rotational speed of the tool was (800 rpm).

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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