1. The injection molding machine can't open the mold again. There is pressure, speed, oil to the cylinder, and the pressure is 120kg. Why do you often cannot open the mold?
1 Is the oil seal of the mold opening cylinder damaged?
2 Is the mechanical part of the clamping mechanism stuck?
3 Check the mold opening valve; see if the valve core is not in place
4 Are the speed, pressure, and position parameters appropriate?
5 Is the mold opening position reached? Look at the screen to check the electronic ruler or mold opening stop travel switch.
6 If this kind of problem often occurs, first check the oil circuit part, but the mechanical part should be checked more to see if there is any wear or unevenness of the connecting rod.
2. It is normal when the mold is opened manually. But in the semi/automatic mode, when the mold is opened to the set position, it stops for a while without stopping, and then displays the P and F values set for slow and fast speed. To make the mold open Overtravel cannot be produced.
Preliminary exclusion:
①P and F are set too large; there is no problem of mold opening inertia.
②The electronic ruler has been replaced.
③The program test is normal.
1 The mold opening back pressure is not set or the oil circuit is faulty.
2 Unreasonable setting of the switching point of the mold opening speed and slow speed position
3 Check the mold opening solenoid valve core
4 P.Q valve inspection, whether the spool movement is linear
5 Is there a signal stop lag in the computer output?
6 Mold opening pressure, flow setting is too large
3. There is a Haitian 240 machine that has been in service for less than ten years. More than a year ago, because the mold was often not opened, a full set of machine hinges had been replaced. Later, the machine could not be opened after the mold was locked, and it needed to be knocked out manually. Then we replaced the entire set of hinged steel sleeves, but the problem was not completely solved, or the old problems often recurred. Specific conditions:
1. When the mold is locked to the low pressure protection position, the two cross guide rods have signs of being lifted up, and there are signs of being pressed down when the mold is opened. The reason why the mold cannot be opened is that the cross cannot pass the ※ point, so one Knock is equivalent to adding a little external force to open the mold;
2. Measures that have been taken: In addition to changing the hinged steel sleeve of the machine, the copper sleeve of the cross was replaced, and the balance was adjusted when suspected that the Corinthian column was unbalanced, but the fault remained!
1 Cross head and 2 guide rods replaced! Suspected variant
2 You can adjust the feet of a moving plate, and increase the moving plate a bit higher. The machine is used for a long time, and the moving plate sinks due to wear and tear.
3 Confirm that the failure was caused by the failure of the various procedures when the hinge steel sleeve of the machine was first dismantled and replaced. Assembling errors occurred, resulting in inconsistent upper and lower crank arms. It should be listed as the company's obsolete machines.
4 Never high pressure mold clamping during shutdown.
