Optimization of Trapezoidal Runner in Plastic Molding Based on MATLAB

Abstract:

The runner design is an important parts in plastic molding design. Its shape and dimensions have special effects on the molten plastic’s pressure, hot loss, injection speed, etc. At present, trapezoidal runner is used widely for better fluidity and lower assembly precision relatively compared with the circular runner. This paper uses the Fminsearch function of MATLAB and constructs an objective function based on the minimum length of the perimeter of the trapezoidal runner to optimize the trapezoidal runner section. The conclusion of this paper is that the perimeter of the trapezoidal runner is the shortest one when a equals c (shown as Fig.1), as well as the obtuse angle between a and c equals 120o. At this conditions, the volume of the molten plastic that flows through the runner section is maximum when the trapezoidal runner section area is given. The optimization results in the plastic mould design can used as the size or the constraints to drive the runner section in 3D CAD/CAM software, which can help the designer to get the trapezoidal runner section easily and quickly.

• Periodical: Applied Mechanics and Materials (Volume 552)
• Pages: 66-69
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.552.66
• Online since: June 2014
• Authors: Gui Jie Fan*
• Keywords: MATLAB, Optimization, Plastic Molding, Trapezoidal Runner

References

[1] Liu, ChaoFu. Designer Instant References of Plastic molding[M]. Chemical Industry Press, Beijing, 2010. (In Chinese).

[2] Guo, RenSheng. Mechanical Engineering Design Analysis and MATLAB Applications[M]. China Machine Press, Beijing, 2011: 403-404 (In Chinese).

[3] Song, YuHeng. Plastic molding Design Application Manual[M]. Aviation Industry Press，Beijing, 1994 (In Chinese).

[4] Guo, RenSheng. Geometric Description of Optimization Model based on MATLAB [J]. Machine, 2005(3): 84-88. (In Chinese).

[5] Guo, RenSheng. Optimization Analysis and Calculation Based on MATLAB [J]. Machine, 2004(2): 60-62. (In Chinese).