Experimental validation of simulated weld line formation in injection moulded parts

Kovács, József; Sikló, B.

doi:10.1016/j.polymertesting.2010.06.003

Cited by 22 publications

(25 citation statements)

References 21 publications

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“…Their consumption has become a benchmark of how developed a country is. In the injection molding cycle defects can occur, such as burn marks [1], delamination [2], flash [3], jetting [4], sink marks [5], weld lines [6] or warpage [7] and these can cause injection molded parts to be rejected. Typically, the most serious are problems that could damage the mold and/or affect product safety.…”

Section: Introductionmentioning

confidence: 99%

The analysis of injection molding defects caused by gate vestiges

Tábi¹,

Suplicz²,

Szabó³

et al. 2015

Express Polym. Lett.

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Abstract. Issues of product safety are the most serious problems of an injection molded product due to their risk to human health. Such a safety problem can be the needle-shaped vestige at the gate zone of injection molded products, called a gate vestige. Only observations of the formation of gate vestiges can be found in the literature, but the processing parameters influencing their dimensions, especially their height have not been studied yet. Our goal was to study the effect of various injection molding processing parameters and gate constructions on gate vestige formation.

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Section: Introductionmentioning

confidence: 99%

The analysis of injection molding defects caused by gate vestiges

Tábi¹,

Suplicz²,

Szabó³

et al. 2015

Express Polym. Lett.

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“…2 Kova´cs and Siklo´focused on the analysis of weld line formation and suggested several ways to modify the finite element mesh to get better results. 21 Wu et al adopted a distributed multi-population genetic algorithm (DMPGA) to injection molding optimization with weld line design constraints. 22 With development in numerical modeling and computer simulation techniques, computer simulation systems of injection molding have had success in predicting filling behavior in extremely complicated geometries, and they are capable of predicting weld lines' location.…”

Section: Introductionmentioning

confidence: 99%

“…22 With development in numerical modeling and computer simulation techniques, computer simulation systems of injection molding have had success in predicting filling behavior in extremely complicated geometries, and they are capable of predicting weld lines' location. 12,21 Unfortunately, most of the research work about weld lines optimization is oriented to the optimization of process parameters or mold designs. It is hardly to find in the published literature detailed introduction of the method for computer determining weld line positions and lengths.…”

Section: Introductionmentioning

confidence: 99%

Computer determination of weld lines in injection molding based on filling simulation with surface model

Ding

Zhao

Zhou

et al. 2014

Journal of Reinforced Plastics and Composites

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Weld line is aesthetically unpleasant and affects the mechanical strength of injection molded parts. Because of the everincreasing requirements for parts performance, lots of researchers have performed various studies related to the weld lines optimization. However, research about the computer determination of weld lines in injection molding remains scarce. In this paper, a weld line computer determination method based on filling simulation with surface model is proposed, from which the positions and lengths of the weld lines can be predicted. According to the characteristics of the surface model, all weld lines are classified into two different types. Initial welding node searching and revision algorithms for the two different types of weld lines are first developed. Starting from initial welding nodes, weld lines are then extended by a pre-extension algorithm and an extension algorithm. In the weld line extension algorithm, 135 is set as a welding angle threshold for forming weld lines. Finally, the effects of cavity thickness, process parameters, and mesh densities have been investigated. Moreover, Moldflow simulation results and real parts in production have been conducted to verify the proposed determination method, which demonstrate that the proposed method is correct and effective in actual production.

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“…As one of the hot topics in the field of polymer precise injection molding, quality control of injection molded parts has always been of concern. The factors that affect on the product quality of injection molding include processing conditions,injection mold, molding equipment and auxiliary equipment (Woll and Cooper, 1997;Kovács and Sikló, 2010). There are many factors that influence product quality, but finally reflected in the different changes of specific volume (V).…”

Section: Introductionmentioning

confidence: 99%

Study on Packing Phase Control Based on the Cavity Pressure-Temperature during Injection Molding

Xie

Wang

et al. 2014

International Polymer Processing

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Packing phase control during injection molding process plays ac rucial role in ensuring the product quality. As one of the hot topics in the field of polymer precise injection molding, quality control of injection molded parts has always been of concern. In this present study, ap art weight control method based on the cavity pressure-temperature during the packing phase was proposed. Experimental results illustrated that the proposed method, which used cavity pressure and Pressure-Temperature (P-T) control as filling-to-packing switchover mode and packing method respectively, was an effective approach for the part weight control. Typical crystalline material (polypropylene) and amorphous material (ABS) were chosen to further verify the feasibility of the control method, and experiments had shown to yield consistent conclusions. The experimental results and conclusions presented in this paper will be useful for proper setting of injection molding process.

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Experimental validation of simulated weld line formation in injection moulded parts

Cited by 22 publications

References 21 publications

The analysis of injection molding defects caused by gate vestiges

The analysis of injection molding defects caused by gate vestiges

Computer determination of weld lines in injection molding based on filling simulation with surface model

Study on Packing Phase Control Based on the Cavity Pressure-Temperature during Injection Molding

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