Browse > Article

Optimum Design of Rubber Injection Molding Process for the Preparation of Anti-vibration Rubber  

Lim, Kwang-Hee (Department of Chemical Engineering, Daegu University)
Publication Information
Korean Chemical Engineering Research / v.48, no.4, 2010 , pp. 490-498 More about this Journal
Abstract
The optimum mold design and the optimum process condition were constructed upon executing process simulation of rubber injection molding with the commercial CAE program of MOLDFLOW(Ver. 5.2) in order to solve the process-problems of K company relating to air-traps and short-shots. The former occurs at the cavity edge of torque-rod-bush and the latter takes place for the injection molding of dynamic dampers. As a result the process problem relating to air traps was solved by optimizing edge-angle and the number of gates to prevent the flow congestion of flow-front and to make the flow-front movement unaffected by congestion. For dynamic dampers of K company the unmolded flaw caused by their unfilled cavity was corrected by installing the air-vent at the confronting locations of both upstream and downstream of flow-front where air traps frequently occur. Besides the unmolded flaws were rectified by altering the position of gate from the upper to the middle or by increasing the number of gates. Thus the process problems of K company relating to air-traps and short-shots of torque-rod-bush and dynamic dampers, respectively, were solved by proper altering of mold design with process simulation of rubber injection molding.
Keywords
Rubber Injection Molding; Process Simulation; Optimum Process Condition; Air Trap; Short-Shot;
Citations & Related Records
연도 인용수 순위
  • Reference
1 Gent, A. N., Engineering with Rubber, Hanser Gardner(2001).
2 JIS K6385.
3 JIS K6386.
4 Choi, J.W., "Rubber Injection Molding," J. Korean Institute of Rubber Industry, 21, 20(1986).
5 Harry, D. H. and Parrot, R. G., "Numerical Simulation of Injection Mold Filling," Polym. Eng. Sci., 10, 209 (1970).   DOI
6 Gao, F., Patterson, W. I. and Karmal, M. R., "Cavity Pressure Dynamics and Self-Tuning Control for Filling and Packing Phases of Thermoplastics Injection Molding," Polym. Eng. Sci., 36, 1272(1996).   DOI   ScienceOn
7 Lee, Y. B. and Kwon, T. H., "Modeling and Numerical Simulation of Residual Stresses and Birefringence in Injection Molded Centered-gated Disks," J. Mater. Process. Technol., 111, 214(2001).   DOI   ScienceOn
8 Hieber, C. A. and Shen, S. F., "A Finite-element/Finite-difference Simulation of the Injection-molding Filling Process," Journal of Non-Newtonian Fluid Mechanics, 7, 1(1980).   DOI   ScienceOn
9 Tucker, C. Fundamentals of Computer Modeling for Polymer Processing, Hanser, Munich(1989).
10 Hieber, C. and S. Shen, "A Finite-element/Finite-differenece Simulation of the Injection-Molding Process," J. Non-Newtonian Fluid Mech., 7, 1(1980).   DOI   ScienceOn
11 Kennedy, P., Flow Analysis of Injection Molds, Hanser, Munich (1995).
12 Chiang, H. H., Hieber, C. A. and Wang, K. K., "A Unified Simulation of the Filling AND Postfilling Stages in Injection Molding," Polym. Eng. Sci., 31, 116(1991).   DOI
13 Hieber, C. and S. Shen, "A Finite-element/Finite-differenece Simulation of the Injection-Molding Process," J. Non-Newtonian Fluid Mech., 7, 1(1980).   DOI   ScienceOn