Manufacturing Technology 2016, 16(6):1259-1264 | DOI: 10.21062/ujep/x.2016/a/1213-2489/MT/16/6/1259

Reduction of Sink Marks in Injection Overmolding Process of Metal-Plastic Parts

Ernest Gondár, Alexander Schrek, Pavol ©vec
Faculty of Mechanical Engineering, Slovak University of Technology in Bratislava. Pionierska 15, 831 02 Bratislava. Slovak Republic

Metal-plastic parts with steel inserts prepared by overmolding technique showed several molding defects including sink marks. The depths of sink marks on overmolding metal-plastic parts prepared at two injection overmolding temperatures of 280 and 230 °C and the same packing pressure of 60 MPa were measured by contact profilometer. They reached the depths of 3.02 mm and 1.51 mm at the overmolding temperature of 280 and 230 °C respectively. These values were correlated with sink marks indexes simulated in Moldflow software at the same conditions. Based on the simulated and measured results the optimal process parameters with injection temperature of 200 °C and packing pressure of 25 MPa were proposed. Simulation showed a positive effect of optimized parameters on sink marks minimizations. Sink marks indexes decreased of 20 % and 53 % compared to injection molding temperatures of 230 and 280 °C respectively. Maximal depth of sinks marks decreased to the value of 1.00 mm at optimized injection overmolding process parameters.

Keywords: metal-plastic part, overmolding, sink mark, simulation, residual stress

Published: December 1, 2016  Show citation

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Gondár E, Schrek A, ©vec P. Reduction of Sink Marks in Injection Overmolding Process of Metal-Plastic Parts. Manufacturing Technology. 2016;16(6):1259-1264. doi: 10.21062/ujep/x.2016/a/1213-2489/MT/16/6/1259.
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