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The numeric modelling of the temperature profile of moulded piece in thermostatic mould form

Gnatowski A., Stachowiak T.

Journal of Achievements in Materials and Manufacturing Engineering

2011

Vol. 44, nr 1

57--63

Purpose: The project shows the results of researches of the flow of polymer materials during the filling the mould. The main purpose of carry out research was estimate the influence thermal conditions of the mould on the temperature profile of injection moulded parts. Design/methodology/approach: The most important issues like injection moulding process and the conditions of this process are covered in article. Moreover, the computer system used in the process of material conversion like Cadmould-3D by SIMCON is analysed in this work.The simulation of the injection moulding process is done with the variety of different parameters of conversion. The aim of this simulation was to present the distribution of the temperature in the moulded piece. The cooling system of the injection moulding form was taken into analysis during this simulation. Findings: The results of researches enabled documentation of specific occurrences in injectionmolding process of polymer materials and comparison of those results with the results of numericalcalculations. Research limitations/implications: Research was limited to a three thermoplastics polymers. Carrying out of simulation of injection process require data input concerning geometrical parameters of moulded piece, conditions of injection process,properties of processed plastic and data referring to injection machine into calculating program. Practical implications: The investigation delivered information about temperature profile of moulded piece in thermostatic mould form, what can be useful in practice, when selecting the material for good quality parts. Originality/value: In result of carried out computer simulations, extensive research material was obtained, which was subjected into detailed analysis in order to its adequate interpretation.

Selected methods of modelling of polymer during the injection moulding process

Koszkul J., Nabiałek J.

Journal of Achievements in Materials and Manufacturing Engineering

2007

Vol. 24, nr 1

253-259

Purpose: The purpose of present paper was presenting chosen results of investigations on polymer flow during mould cavity filling phase of injection process. Advancement in the simulation software make possible to model more phenomena occurring during polymer flow in injection molding process. Design/methodology/approach: The results of computer simulations of injection process have been compared with the results of video recording for the plastic flow during filling phase. For the simulating investigations a professional computer software Moldflow Plastics Insight ver. 6.1. has been employed. A specialized injection mould which enables observation and registration of the plastic flow during processing has been employed. The mould enables direct monitoring of the course of phenomena inside the mould cavity in two planes. To record the flow, a digital video camera has been employed. As an example the issue of stream flow (jeting) have been described. Findings: The results of the investigations enabled documenting of specific phenomena which occur during plastics or their composites injection process. The registered video sequences have been compared with the results of numerical calculations and then it was estimated to what degree the computer simulation of injection process may be useful in practice. Research limitations/implications: The camera enabled to register the flows with the rate of 25 fps. This reduced the scope of the investigations, since at higher plastic flow speeds the registered image became less clear. The investigations were performed on a wide scale, however, only chosen results have been presented. Practical implications: Deep understanding of the phenomena which occur during filling the injection mould may lead to more effective design of the processing tools and shortening of the time for implementation and production time. Originality/value: The transparent sight-glasses have been used, made of a material called ZerodurŽ which is characterized by the coefficient of thermal expansion close to zero.