Debugging and debugging process of injection molding machine
Causes and solutions of plastic forming defectsIncorrect operating conditions, damage to the machine and mold will cause a lot of molding defects, the following provides some solutions for reference. In order to reduce down time, reason and can find out the operation problem as soon as possible, the operator should put all the best record in the condition of injection type injection molding condition record table, for days after the reference for problem solving.(1) the finished product is incompleteFault reason handling methodThe plastic temperature is too low to increase the temperature of the fuse tubeThe injection pressure is too low to increase the injection pressureThe amount of injection is not enoughWith the nozzle with the sprue bushing is plastic spill to re adjust its coordinationThe shot time is too short to increase the injection timeThe injection speed is too slow to accelerate the injection speedImproper adjustment of low pressureMold temperature is too low to improve mold temperatureThe mold temperature is uneven, the mold pipe is re adjustedThe exhaust of the mould is not proper, and the proper exhaust hole is installed at the proper placeThe nozzle temperature is not low, and the nozzle temperature is increasedUnequal opening of mold to re release the mold overflow positionThe sprue or overflow is too small to enlarge the sprue or overflowPlastic lubricant does not increase lubricantBack pressure is insufficient, slightly increase back pressureRubber ring, adhesive screw wear, removal, inspection and repairInsufficient injection capacity, replacement of larger specifications of injection molding machinesThe product is too thin and use nitrogen spray
(3) finished mold;Fault reason handling methodThe filling is too low to reduce the discharge pressure, time, speed, and the amount of injectionThe injection pressure is too high to reduce the injection pressureExcessive injection of glue reduces the amount of injectionThe injection time is too long to reduce the time between the shotsThe temperature is too high to reduce the temperature of materialUneven feeding, partial fullness, change of overflow size or positionThe mold temperature is too high or too low to adjust the mold temperature and the relative temperature at both sidesDie release, chamfering, repair die, remove chamferThe mold surface is not smooth, grinding dieDemoulding causes vacuum mold opening or ejection slowing down or mold adding air intake equipmentThe injection cycle is too short to increase coolingMold release is insufficient, slightly increase the amount of mold release agent(4) die for runner (nozzle);Fault reason handling methodThe injection pressure is too high to reduce the injection pressurePlastic temperature is too high to reduce plastic temperatureThe sprue is too big to change the moldThe sprue cooling is not enough to prolong the cooling time or lower the cooling temperatureThe sprue release angle is not enough to modify the mold to increase the angleThe sprue bushing is not in alignment with the nozzle to readjust its fitThe inner surface of the sprue is not only or has the mold of demoulding and chamferingPouring hole mold repair damaged roadNo sprue catch pinThe filling is too rich to reduce the amount of injection, time and speedMold release is insufficient, slightly increase the amount of mold release agent
(2) products shrinkFault reason handling methodInsufficient mold penetrationThe amount of melt is not enough, plus the amount of melt adhesiveLow glue pressure, low pressureHigh back pressure back pressure is not enoughInjection time too short injection timeInjection speed is too slow or fastThe overflow is uneven and the overflow of the mold is too small or in placeThe nozzle hole is too thin, plastic in the sprue bushing in solidification, reduce the back pressure effect. Adjust the mold or replace the nozzleMaterial temperature is too high and material temperature is lowImproper temperature and proper temperatureThe cooling time is not enough to prolong the cooling timeWhen the pressure storage section is too large, the adhesive shall terminate at the front endThe product itself or its ribs and columns are too thick to review the finished product designExcessive injection of glue to replace the finer injection molding machineWear removal of apron and adhesive screwGate is too small, plastic solidification loss, back pressure action, increase gate size
