Maintenance and Care of Die Casting Machines 2

3 Electrical part

3.1 Main motor

3.1.1 Rotation direction

After starting the machine for the first time or replacing the power circuit and the motor circuit, it is necessary first to confirm whether the rotation of the motor is correct. The specific method is to press the motor start button, observe the rotation of the motor from the fan blade at the rear of the motor, and the motor should rotate clockwise.

Otherwise, it is necessary to cut off the power supply and exchange the two phases of the power supply at will. Press the motor button again to confirm that the steering is correct.

3.1.2 Motor air duct/check every three months

The motor should be cleaned and overhauled every three months. When the motor is in use, it should prevent foreign objects from entering the body prevent the wind hood and the air duct from being blocked. Once the above abnormal conditions are found, they should be stopped and dealt with in time.

3.2 Electrical control box

3.2.1 Locking

The electrical control box is the key part of electrical maintenance, and the use and management of the electrical box should be strengthened at ordinary times. After opening the electrical box for maintenance or setting parameters, the electrical box door should be locked in time.

Non-professionals are not allowed to open the electrical box at will and do not press the control buttons in the electrical box or set relevant parameters on the control panel.

3.2.2 Controllable potentiometer

The controllable potentiometers on the control board have been adjusted before leaving the factory. However, if necessary, professionals should adjust them to avoid damage to the machine.

3.2.3 Clean the electrical box/check every three months

Clean the electric box every three months to keep the inside of the electric box dry and tidy. Do not store wires, metal products, magnetic substances, or inflammable and other sundries inside the electric box to ensure air circulation and good heat dissipation conditions in the electric box. The electric cleaning box should be powered off.

3.2.4 Line

In the daily repair of the electric box, the wiring should be neat, and the wire number should meet the technical requirements. Excess wires should be cut off. Do not allow random wiring or long exposed wires to be stored inside the electrical box. After repairs, cover the wire slot cover in time and lock the electrical box door.

3.2.5 Tighten the terminals/semi-annual inspection

All wiring terminals in the electrical box should be tightened every six months to prevent electrical fires caused by the high temperature of the terminals due to poor contact caused by looseness. For high-current terminals (such as the input and output terminals of the contactor, the terminals of the motor, the input terminals of the power supply, etc.), the wire lugs should be pressed with special tools, and the conductive parts of the wire lugs should be ground flat.

3.2.6 Power outage

When the power is cut off, the main switch of the external power supply of the machine, the power switch in the electric box, the air switch and the power switch on the operation panel should be turned off to prevent accidents.

3.3 Maintenance of external circuits

3.3.1 Inspection before commissioning

Before the trial operation of the new machine, first check that the electrical lines are in good condition, requiring no short circuit, no open circuit, no missing installation, and no looseness. The position of each induction switch and limit switch is accurate, and the power is turned on to test its function in good condition.

3.3.2 Electrical wiring/Daily inspection

The external electrical lines of the machine must be intact and securely bound. If the sheath of the power cord is damaged, replace the sheath in time.

3.3.3 Repair/Line Number

In the daily repair process, it is strictly forbidden to build the line randomly, the wiring must be standardized, the line type must meet the use requirements, and the line number must be consistent with the lead wire number of the main electrical box. It must not be changed or lost at will.3

3.4 External signal device

3.4.1 Switch appearance/month

Overhaul each limit switch and induction switch once a month. Requirements: The limit switch and induction switch are sensitive in action, the installation screws are not loose, and the dust, oil traces, magnetic substances, etc., on the surface should be wiped off, as shown in the figure below.

Clod Chamber Die Casting Machine

Hot Chamber Die Casting Machine

3.4.2 Switch signal

 If the signal from any limit switch and induction switch to the computer input point is wrong during the operation, stop the machine and check the corresponding circuit of the input point.

3.5 Power supply voltage

The power supply voltage fluctuation range is required to be within ±5% of the rated value.

4 Clamping part

4.1 Toggle screws/quarterly

The toggle (machine hinge) is a key part of the mold clamping system, and the screws of the toggle (machine hinge) part should be retightened every three months.

4.2 Middle plate copper sleeve/month

Regularly check the sliding bearing and sealing ring of the movable seat plate. If worn, it should be replaced in time.

4.3 Adjustment of the sliding foot of the middle plate

The adjustment of the sliding feet of the movable seat plate should be moderate. Too tight will cause the steel plate and elbow to wear in advance, and too loose or too tight will lead to deformation or wear of the pull bar and abnormal opening and closing of the mold.

4.4 Modulation

The speed of the mold-adjusting movement should be slow, and the appropriate pressure and flow should be set. The mold-adjusting movement must be carried out after the mold-opening movement is terminated; otherwise, the thread of the Colin column or the adjusting nut will be damaged.

4.5 Eccentric die

When the mold is installed, it is best to be in the middle of the mold plate. Eccentricity will cause uneven force, which can easily cause early wear of the elbow. The mold should take this problem into account at the design stage.

4.6 Assemble mold screw / T-shaped Slot

Before installing the mold fastening bolts, the T-shaped grooves and assembly holes should be cleaned up, and the threads should not be damaged by forcibly screwing the bolts into the screw holes.

4.7 Clamping force

When installing the mold, the machine should choose the “manual” operation mode, and the clamping force should be selected as a smaller value under the premise of satisfying the production. Working under the maximum clamping force for a long time will accelerate the wear of the elbow.

5 Injection part

5.1 Check the injection center/yearly

The cold chamber machine should check the injection center once a year. Confirm that the coaxial between the injection chamber and the injection piston rod is within the required value.

5.2 Clean up the slag in time.

5.3 Matching surface of high-temperature parts

During the injection process, if the movement resistance of the punch increases, the speed becomes slower, or even splashes out from the gate, the punch and the injection chamber should be checked in time, and the worn punch should be replaced. Likewise, check the hammerhead when the hot chamber machine turns the material and replace it if necessary.

5.4 Cooling

The cold room machine should pay attention to check the cooling water system of the punch, and the hot room machine should check the temperature of the cooling water pipe of the injection cylinder. It is required that there is no water leakage and no overheating.