Abstract
The distribution of heating gun ends plays a decisive role in the sidewall properties of finished rotomolded products. To obtain the optimal distribution of the end face of a rotational molding heating gun, the temperature response of the end-face mold under heating gun heating was investigated, and an analysis method based on numerical simulation is proposed. The FDS (fire dynamics simulator) was used to construct a heating model of the heating gun, simulate and obtain a heatmap of the temperature field distribution of a heating gun of Φ30–70 mm, and determine the optimal diameter and heating distance of the heating gun. ANSYS was used to establish the thermal response model of the heat-affected mold, which was combined with the mold structure and thermophysical properties of steel. A temperature field distribution on the inner wall surface of Φ30, Φ50, and Φ70 mm heating guns when heating at each diameter of the end face was obtained and the distribution position of the end face of each diameter heating gun was determined. ANSYS was used to establish the thermal response model of the end-face mold and obtain the temperature field distribution of the inner wall surface of the end-face mold. The size of the heat-affected area of each diameter heating gun was combined, the end-face heating gun distribution was optimized, and the optimal heating gun end-face distribution was obtained. An experimental platform was built, and a validation experiment was set up. Through the analysis and processing of the data of three experiments, the temperature variation curve of each diameter on the inner surface of the end-face mold was obtained. We compare and analyze the simulation and experimental results to determine the feasibility of the FDS + ANSYS method and the correctness and accuracy of the simulation model and the results.
Highlights
Rotational molding is a kind of molding method that relies only on the gravity and centrifugal force of the raw material to process it into a specific shape [1,2]
We noticed that most of the theoretical studies on the heating stage of the rotomolding process focused on the analysis of the mold structure and its internal air temperature field, using simulation software to establish the corresponding model, simulation to obtain the internal air temperature, and mold internal temperature field distribution to achieve the role of guidance for the rotomolding process
(2) During the simulated heating process of the 50 mm heating gun, the heat-affected area did not change substantially with the distance, the central temperature continuously increased with the distance, the edge temperature continuously increased with the distance, and the overall temperature gradient was smoother with the distance
Summary
Rotational molding is a kind of molding method that relies only on the gravity and centrifugal force of the raw material to process it into a specific shape [1,2]. (1) During the simulated heating process of the 30 mm heating gun, the heat-affected area gradually decreased with increasing distance from the mold, and the central temperature increased with it. (2) During the simulated heating process of the 50 mm heating gun, the heat-affected area did not change substantially with the distance, the central temperature continuously increased with the distance, the edge temperature continuously increased with the distance, and the overall temperature gradient was smoother with the distance. The 130 mm distance (2) During the simulated heating process of the 50 mm heating gun, the heat-affected area did not change substantially with the distance, the central temperature con6toifn1u8ously increased with the distance, the edge temperature continuously increased with the distance, and the overall temperature gradient was smoother with the distance. Where ε is the integrated radiation coefficient and σ is the Stefan-Boltzmann constant, taken as 5.67 × 10−8 W/(m2·K4)
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