How will the screw speed of injection molding machine be adjusted slowly?
Injection molding machine screw speed, first, adjust the injection molding machine pre molding pressure and flow, and then adjust the back pressure
In the screw speed adjustment, from the lower speed start, gradually commissioning to higher speed, and then determine the screw speed.The working speed of the screw of the injection machine is unstable and is affected by the following factors:1, drive V belt wear seriously, slipping when working.2, V belt drive belt wheel center distance is too small, so that belt drive can not and belt pulley trapezoidal slope correct friction drive work.3. The temperature of the heating material in the barrel is low, and the material is not uniform, which leads to the screw rotation of the injection machine, the increase of the working load torque, and the instability of the screw speed of the injection molding machine.4, injection molding machine screw thrust bearing damage, etc..
1) the rated screw speed of injection molding machine. When molding PS, the plasticizing capacity and the screw speed of the material to be processed are calibrated by 50%--60% of the rated plasticizing quantity.2) determine the screw speed according to the maximum linear speed that the polymer can allow.The maximum speed of screw is n=V/ PI DThe maximum line speed allowed by V---- polymers in the formula. General polymer V=80cmm/S thermosensitive polymer V=1.8cm/sD---- screw diameter (CM)3) depending on the allowable shear rate r of the polymer, the V in the upper form is replaced by R and then determined.
