Commissioning process of injection molding machine
7., according to the requirements of the product, adjust the corresponding packing speed (lower than the filling speed), the packing pressure is about 50% of the filling pressure, for the pressure and the feeding pressure.8. adjust the holding time and time, and find the reasonable holding time (the weight of the beer is basically the same after the sufficient holding time).9. adjust the front gasket of the screw for 5% ~ 10% of the injection quantity.10. set the 0.5 to 1 second delay of the screw (release the pressure of the screw head),11. set back pressure is constant 50 ~ 100PSI.After the debugging of the above program, the technological parameters of the die can be determined, and it is more reasonable and scientific. At the same time, the process parameters of other moulds can also be tested in the production process.This method is suitable for non Newtonian fluids of plastics (conventional adhesives)
3. calculate the relative viscosity of the plastic with the reciprocal of the filling time multiplied by the peak pressure value. The reciprocal of the filling time is the abscissa, the relative viscosity is the ordinate, and the relative viscosity is plotted. The viscosity curve can be found in the low speed high speed changes more, little viscosity change, find a middle viscosity curve trend in value from flat as we used for the production of fire, (also can be judged according to the change of filling time of plastic viscosity stability when the filling time changes, the peak pressure is small) to overcome the rubber mold flow resistance when the pressure, but also beer pieces of the actual pressure, we use this value is greater than 10% for injection pressure.4. determine the pressure and speed, then come to the switching point, do the packing and feeding in beer 95% ~ 99% position switch for holding position. (padding should be controlled by position rather than pressure or time)5. the filling time should be constant, the injection time is longer than the filling time, so as not to be controlled by time, for example, the injection time, whether it is 4 seconds or seconds, the filling time is about 1 second.6. in this way, the filling time and the holding time can be set up. The average injection time is 0.5 seconds longer than the filling time, and the other can be used as the holding and filling time.
When we receive a set of moulds, we need to choose the machine according to the size of the mold, the clamping force and the size of the glue.Determine the type of machine before you enter the real tune. (the premise is that the machine is normal.)1. we first beer 10 beer water board plastic pieces (not go together -- about 95% of the full plastic glue), set the appropriate pressure to ensure that the actual pressure below the set (high pressure), starting from the highest rate of 99%, and then gradually reduce an amount equal to (10%) 10 plastic beer beer. - (constant pressure, rate of change of each separated by 10% to complete the 10 beer beer).2. record the filling time of each beer and the injection peak pressure.
