Home Product / Techniques Operation and Maintenance of Injection Molding Machine

What are the items to be checked before operating an injection molding machine? Hydraulic Oil: Check if the hydraulic oil is between min. and max. line of oil gauge? If the toggle auto filler oil at proper level? Cooling water: Check if the cooling water pipe is free of leakage and if water level sufficient to have normal cooling effect. Start heating element and check: Ensure the electric heater of dryer, barrel and mold are at normal condition, especially the temperature must reach the set temperature before working injection, retreat and screwing motions. Check the safety door and safety rod: Ensure the opening and closing of safety doors are normal, and the contact between safety door and each limit switch and the pressure relief valve are normal. Ensure the safety rod is proper position and firmly locked. Ensure the red press buttons on the operation box are working normally, so as to ensure the safety of operator. Lubricating device check: Check if the grease oil level is sufficient and the filler time setting is proper and the filing device piping are unimpeded? Moving mechanism check: All moving mechanism shall have proper lubrication, and the debris and dust on the moving parts shall be cleaned and maintain the friction surface clean and smooth. No tool shall be placed on moving parts, so to avoid breaking while machine is in operation. Low pressure mold closing device check: Correctly adjust low pressure mold closing device to ensure the safety of mold. Check other conditions: Ensure all settings, such as temperature, pressure, speed, timing and distance are correct. Load free check: Work full-auto operation at lower pressure and let it run load-free for 10 to 30 min. and commence normal operation after a steady working condition is reached. Noise check: Record the sounds at normal operation and the sound of hydraulic pump, it will allow operator to detect abnormality like blocking of filter, air-intake, internal wear. The buzz sound of solenoid is related to the debris in the internal axis. The buzz sound of relay and magnetic contact indicate dirt and dust existence at the contact. Check the cause of the noise will be helpful in preventing damage.

What are the items to be checked when stopping an injection molding machine? Shut the gate of material hopper and reduce or close the heating device of hopper (depends on the length of time of the stop. Shoot out all the resin in the material pipe, particularly acid and corrosive materials must be totally cleaned up. Wipe mold to clean and apply anti-rust treatment. (depend on the length of time stopping operation) When machine stopped, if the mold is not removed, do not extend toggle straight. Close cooling water and switch off power. Clean machine.

How often should an injection molding machine be checked? What are the items to check? Weekly regular check Heater check—Check for any broken wire or ill contact. (For CE model, check the reading of amp meter). Leakage check—Check the fittings of cylinder, oil pipe and solenoid for leakage. Screw and nut check—Check the bolts, screws and nuts of the whole machine for any loss or loose. Nozzle heater band check—remove any and all material attached to the lead wire and nozzle heater band. Remove deposited waste oil on the machine. Filtering mesh cleaning- within the first month, clean it every week, thereafter on monthly basis. Clean the whole machine. Monthly regular check Perform stricter check as per the weekly items and in determined manner. Grounded wire check: grounded wire shall be checked strictly to ensure the user would not suffer electric shock. Electric wire check: Electrical parts are likely to loose off due to vibration, burnt due to increase in current. So the terminal screws must be fasten firmly, and the dust, foreign matters and oxidation on the contact must be removed. Movable mold platen and hydraulic motor seat skate check: check if the skate worn out, screw loose and moving parts are lubricated. Cleaning and check of cooler: if underground, industrial water or salt water is used, remove the cooler to clean on monthly basis to improve and extend the efficiency and service life of cooler. If ordinary tap water is used, it may be cleaned in six-month interval (Basically, soft water is preferred, and add soften agent and scaling agent.) Six-month regular check Repeat the monthly items in stricter and firmer attitude. Hydraulic oil regular check: ask the oil supplier to make regular check of hydraulic oil to ensure the quality of hydraulic oil. Check for any abnormal wearing of the moving part of machine. Annual regular check Repeat the half-year items in stricter and firmer attitude. Electric motor check: Clean the intake port of cooling portion of electric motor with steel brush or air blower, because any dirt or dust exists, it will cause the motor to heat up and result to other heat damage directly. Ventilation system check: Ventilation window installed on closed machine is for ventilation, so the oil stain and dirt attached shall be cleaned to prevent damage due to heating or cause oil temperature to rise. Insulation check: The insulation of wire cover is downgrading gradually, so it is necessary to perform insulation measure to avoid accidental electric leakage and identifying earlier will permit prevention.

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