Determining an acceleration factor for a metering pump used in a polyurethane injection machine



Gi-Chun Lee Byung-Oh Choi Jong-Sik Choi Tae-Jin Song Chae-Young Suh


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.

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