What is the fluctuation of the screw speed of injection molding machine?
Screw speed adjustment of injection molding machineThe extruder screw speed and yield the direct proportion between tsuen. This shows that increasing the screw speed can greatly increase the extrusion yield, but from the angle of stable extrusion, it puts forward higher requirements for the control of screw speed fluctuation. The conventional single screw extruder mostly adopts the transmission mode of the ordinary V belt and gear change. Theoretical analysis shows that the elastic slip of the V belt occurs during the operation of l%-1.6% and causes the loss of rotation. Foreign high pin single screw extruder has adopted the direct connection of motor and reducer, and cancelled belt drive.Influence of type and control method of the motor on the extrusion process stability can not be ignored, at home and abroad in recent years extruder host using DC motor or motor, the motor electromagnetic speed compared with the previous working stability of these two kinds of machines has been greatly improved, the FV (vector volume) of AC variable frequency motor control represents the most the new transmission technology. Now, through the use of variable frequency speed regulation machine, with a special extruder for plastic extruder, the screw speed fluctuation can be controlled at about 0.01%.Dongguan Huahong Plastic Machinery Factory suggested that we should adopt it
Effect of injection molding machine screw on extrusion stabilityWith the increase of the head resistance, the characteristics become "soft". This kind of 'soft' characteristic is detrimental to the production location of the high extruder. 1KV system through the use of slotted bushing, significantly improve the extruder body trapped transport efficiency, making the extruder with "hard" characteristics, but the effect of screw speed fluctuation rate from convection angle, extrusion machine to be more "hard" screw speed fluctuation rate fluctuation influence bigger convection. From what has been said above, we can assume that the extrusion flow rate Q varies with the screw n. If the ratio increases or decreases, 1% of the screw speed fluctuations will result in 1% of the extrusion output fluctuations.
Screw speed fluctuation of injection molding machineFor isothermal Newton fluid, the volumetric flow rate (Q) of the extruder is proportional to the isothermal Newton flow, and the extrusion flow rate is proportional to the screw speed. This relationship has important guiding significance for production practice. It shows that the output of extruder can be greatly improved by increasing the rotational speed. The history of the development of single screw extrusion machine also increases the speed of ladle is one important way to improve the production capacity of a single machine and the actual extrusion process flow rate and screw speed q is not completely linear, this is mainly because we are in these formulas of the melt viscosity, outlet pressure, melt rheological properties were simplified processing.
