A metering pump for a polyurethane injection machine is used to mix urethane with isocyanate (a plasticizer) and polyol (the raw material of polyurethane). The metering pump has typically used a piston-type hydraulic pump,
which is a high-pressure mixed type; the materials are mixed with a constant flow by the mixing head device, which supplies the fluid flow through the pipelines. In terms of supplying the flow to the devices, the role of the metering pump is important in supplying a constant flow. This study focused on determining the acceleration factors (AF) via the accelerated life test method, as a life test under normal operating conditions takes more than five years to carry out. This research selected the stress factor that accelerated the main failure modes of the polyurethane injection metering pump, and the adopted acceleration model was the inverse power law. After selecting the acceleration factor and the model, the acceleration test was performed with an acceleration pressure of 21 MPa, as the operating pressure of the metering pump under the surveyed field operation conditions was 15 MPa.
Mane, J. V., Chandra, S., Sharma, H., Chavan, V. M., Manjunath, B. S., and Patel, R. J., (2017), Mechanical property evaluation of polyurethane foam under quasistatic and dynamic strain rates: an experimental study, Procedia Engineering, Vol. 173, pp. 726-731
Kaliafetis, P., and Costopoulos, T. H., (1995), Modeling and simulation of an axial piston variable displacement pump with pressure control, Mech. Mach. Theory, Vol. 30(4), pp. 599-612
Bergada, J. M., (2012). A complete analysis of axial piston pump leakage and output flow ripples. Applied Mathematical Modelling, Vol. 36, pp. 1731-1751
Kumar, S., and Bergada, J. M., (2013), The effect of piston grooves performance in an axial piston pumps via CFD analysis, International Journal of Mechanical Sciences, Vol. 66, pp. 168-179
Lee, Y. B., Kim, H. E., Yoo, Y. C., and Park, J. H., (2006), Accelerated life test model for life prediction of piston assemblies in hydraulic pump and motor, Key Engineering Materials, Vol. 326-328(1), pp. 649-652
Angadi, S. V., Jackson, R. L., Choe, S. Y., Flowers, G. T., Suhling, J. C., Chang, Y. K., Ham, J. K., and Bae, J. I., (2009), Reliability and life study of hydraulic solenoid valve. Part 2: Experimental study, Engineering Failure Analysis, Vol. 16(3), pp. 944-963
Pohl, E., and Hermanns, R. T., (2016), Physical model based reliability analysis for accelerated life testing of a fuel supply system, Fuel, Vol. 182, pp. 340-351
Heinz P. B. and Fred K. G., (1997), Machinery failure analysis and troubleshooting, Vol. 2, 3rd Edition, Gulf Publishing Company, pp. 490-493.
Korea Institute of Machinery & Materials, Reliability Assessment Center, (2008), Gear pump for forklift, RS B 0064
Korea Institute of Machinery & Materials, Reliability Assessment Center, (2008), Power steering oil pumps for passenger cars, RS B 0065
SAE international, Aerospace standard, (1999), Pump, hydraulic, variable flow, general specification for, SAE AS19692
Department of defense test method standard, (2008), Environmental engineering considerations and laboratory tests, MIL-STD-810G