Kauçuk reolojisi ölçümü için prototip test cihazı tasarımı ve imalatı

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Thesis Type: Postgraduate

Institution Of The Thesis: Kocaeli University, Fen Bilimleri Enstitüsü, Makina Mühendisliği Bölümü, Turkey

Approval Date: 2023

Thesis Language: Turkish

Student: HASAN ÇAKIR

Supervisor: Tamer Sınmazçelik

Open Archive Collection: AVESIS Open Access Collection

Abstract:

In the traditional rubber industry, compression molds are used. However, this production technique is time-consuming and not precise. Therefore, the injection molding process has been developed, enabling the production of high-quality products. Injection molding provides advantages such as better vulcanization time, less flash, and more consistent mechanical properties. In the rheological characterization test conducted with the designed test device, a force is applied to the material, which is in a molten state in a pot, with the help of a cylinder, and the material is passed through a nozzle with a known length and diameter. Flow curves of the material are determined based on these measurements, and computer-based analysis is carried out using the obtained flow curves and finite element method. The aim is to verify the process parameters and the mixture to be used in the transition from semi-finished to finished products during the prototyping phase of the project by analyzing the data obtained from the rheological test in a computer environment. The simulations performed in the computer environment facilitate the design and process of rubber injection molding. Valuable insights are gained before expensive molds are processed. As a result, it reduces trial and error periods and injection mold revision costs. At the same time, the characteristics of the mixture will be obtained from the rheological characterization test press, which will be designed. Pressure and temperature changes will affect the determination of these characteristics. The outputs of the rheological characterization test press will be compared with the simulation results. Based on these comparisons, the rubber mixture properties will be correlated. In conclusion, the rheological testing, model creation, and material library generated based on NR and NBR mixtures have been successfully concluded with analysis results having a deviation of less than 5% in filling percentage.