An Experimental Study on Incremental Forming Process of Polycarbonate Sheets

Beşliu, Irina; Tămăşag, Ioan; Slătineanu, Laurenţiu

doi:10.1002/masy.202000282

Cited by 12 publications

(8 citation statements)

References 8 publications

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“…Experimental research conditions. Concerning the aspects mentioned above and considering some previous results [13,14], experimental research was designed to modify the heating determined by the rotational movement of the forming tool in contact with the workpiece material. The task was to single-point incremental forming a truncated cone with a 10 mm deep, 15 mm diameter, and of 45 degrees wall angles (Figure 2).…”

Section: Methodsmentioning

confidence: 99%

“…The lowering step of the rotating forming tool after traversing each circular trajectory was 0.5 and 0.9 mm, respectively. The values of the processing parameters were established by considering the value used by other researchers [15], the results of previous research [13,14], and those of preliminary experimental tests.…”

Section: Of 14mentioning

confidence: 99%

“…Some aspects regarding the influence of some geometric parameters of the processed surface and of the working conditions on the maximum values of the tool and semi-finished product temperatures were presented by Bes , liu et al [13,14].…”

Section: Introductionmentioning

confidence: 99%

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

Beşliu

Slătineanu

Dodun

et al. 2021

JMMP

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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.

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Section: Methodsmentioning

confidence: 99%

Section: Of 14mentioning

confidence: 99%

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

Beşliu

Slătineanu

Dodun

et al. 2021

JMMP

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“…The material used in this study is an amorphous thermoplastic polymer also known as a "transparency metal" due to its relevant mechanical and physiochemical properties; significant toughness, stiffness, strength, heat and flame resistance, and dimensionally stability, among others [26], make it strongly used in several applications in the fields of communication, transport, medical apparatus, aerospace environment, and so on [27].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on the Optimization of Incremental Formed Polymer Sheets through a Stair Toolpath Strategy

Formisano,

Boccarusso,

De Fazio

et al. 2024

Preprint

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The incremental sheet forming represents a relatively recent technology that guarantees high customization, thanks to the layered manufacturing principle typical of rapid prototyping, and cost-effectiveness, because it does not require dedicated equipment. Research has initially shown that this process is effective in metal materials capable of withstanding plastic deformation but, in recent years, the interest in this technique has been increasing for the manufacture of complex polymer sheet components as an alternative to the conventional technologies, based on heating-shaping-cooling manufacturing routes. Conversely, incremental formed polymer sheets can suffer from some peculiar defects, for example twisting. To reduce the risk of this phenomenon and the occurrence of failures, a viable way is to choose toolpath strategies that make the tool/sheet contact conditions less severe, and this represents the main goal of the present research. Polycarbonate sheets were worked by incremental forming; in detail, cone frusta with a fixed wall angle were manufactured with a reference and a stair toolpath strategy, and both the forming forces and the twist angle were monitored. The analysis of the results highlighted that a stair toolpath involving an alternation of diagonal up and vertical down steps represents a useful strategy to mitigate the forming forces and, with them, the occurrence of the twisting phenomenon in incremental formed thermoplastic sheets.

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“…Polymeric materials that can be processed by SPIF are diverse, starting from materials such as polyamide and polyethylene [ 14 ], polyvinylchloride [ 15 ] and polycarbonate [ 16 ] to composite materials having as the basic matrix one of the aforementioned materials reinforced with different fibers (most often glass fiber) [ 17 ]. The percentage of glass fiber varies, with the most recent studies analyzing the behaviour of these materials during SPIF when using polyamide 6 reinforced with 30 wt.% glass fiber [ 18 ].…”

Section: Introductionmentioning

confidence: 99%

Minimizing the Main Strains and Thickness Reduction in the Single Point Incremental Forming Process of Polyamide and High-Density Polyethylene Sheets

et al. 2023

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Polymeric materials are increasingly used in the automotive industry, aeronautics, medical device industry, etc. due to their advantage of providing good mechanical strength at low weight. The incremental forming process for polymeric materials is gaining increasing importance because of the advantages it offers: relatively complex parts can be produced at minimum cost without the need for complex and expensive dies. Knowing the main strains and especially the thickness reduction is particularly important as it directly contributes to the mechanical strength of the processed parts, including in operation. For the design of experiments, the Taguchi method was chosen, with an L18 orthogonal array obtained by varying the material on two levels (polyamide and polyethylene) and the other three parameters on three levels: punch diameter (6 mm, 8 mm and 10 mm), wall angle (50°, 55° and 60°) and step down (0.5 mm, 0.75 mm and 1 mm). The output parameters were strain in the x direction, strain in the y direction, major strain, minor strain, shear angle and thickness reduction. Two analyses were conducted: signal-to-noise ratio analysis with the smaller-is-better condition and analysis of variance. The optimum values for which the thickness was reduced were the following: wall angle of 50°, punch diameter of 10 mm and step down of 0.75 mm.

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An Experimental Study on Incremental Forming Process of Polycarbonate Sheets

Cited by 12 publications

References 8 publications

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

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

Experimental Investigation on the Optimization of Incremental Formed Polymer Sheets through a Stair Toolpath Strategy

Minimizing the Main Strains and Thickness Reduction in the Single Point Incremental Forming Process of Polyamide and High-Density Polyethylene Sheets

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