Monitoring PROCESS parameters of Injection molding
Which is the control Chart (SPC chart) you suggest for monitoring PROCESS parameters of Injection molding (Like melt cussion, Dosing time, Injection pressure etc..). I am not a Injection Molding expert but as a Quality professional , I am interested to know how to measure the stability of process parameters
My key parameters are, cycle time, transfer pressure, mold temperature, hold pressure. Cycle time because its what make the company money, if it wrong then you need to look at fill time, hold time and cooling or cure time.
Transfer pressure tells me a lot about material, melt temp, transfer positions and so on.
mold temp is key to maintaining the same dimensional part as well as hold pressures.
I'm one that believes that molding process are dynamic they will change there are so many noise factors involved that you can't monitor everything and in molding everything effects everything else. So allow for a certain amount of variation allow you processors to be processors monitor the process and investigate why things change. The worse kind of processor is one that's a knob turner without expectation of why he turned it and what result they expected to see.