The mold opening and closing process exhibits significant jitter and vibration, accompanied by abnormal noises from impact and friction, as well as unstable speed; in severe cases, this can damage the mold and guide pillars.
Improper settings for mold opening/closing speed and pressure: excessive pressure during the low-speed phase and overly steep acceleration/deceleration slopes cause impact. Appropriately reduce low-speed pressure, extend the deceleration buffer zone, and avoid abrupt starts and stops.
Excessive servo response gain: The gain parameter is set too high, causing oscillation in the cylinder's movement; appropriately reduce the servo gain to eliminate jitter and resonance.
Internal cylinder leakage or air ingress in the hydraulic circuit: Air in the system causes jerky movement and abnormal noise; perform oil and air purging, and inspect cylinder seals for wear.
Lack of lubrication, wear, or scoring on guide pillars and guide bushings: Insufficient lubrication causes abnormal friction noise. Inspect the automatic lubrication system and apply grease; replace the components if wear is severe.
Excessive clearance in the toggle mechanism (articulated arm) and wear on pins and bronze bushings: Prolonged use leads to increased clearance at the toggle joints, causing vibration and impact during mold opening and closing. Inspect joint clearances, adjust the mold-locking and mold-adjustment clearances, and replace worn components.
Abnormal clearance in the mold adjustment mechanism, loose mold adjustment nut, tilting of the moving platen, and abnormal noise/vibration during operation; recalibrate the mold adjustment and tighten the locking nut.
The mold is installed unevenly, the clamping plates are not tightened, and the mold is off-center, causing vibration and abnormal noise during opening and closing; realign the mold and tighten the clamping plates.
The mold opening/closing solenoid valve is sticking or the valve spool is worn, resulting in unstable flow output and jerky, intermittent movement; clean or replace the solenoid valve.
Filter element clogged, resulting in insufficient oil supply flow and unstable operation; replace the hydraulic oil filter element and check the cleanliness of the oil.
If the machine vibrates and makes abnormal noises during mold opening and closing while running without a mold, the issue lies with the equipment itself (toggle mechanism, hydraulic cylinder, servo parameters, or valves).
Operation is smooth under no-load conditions, but vibration and abnormal noise occur only after the mold is installed: focus the inspection on the mold installation, mold counterbalancing, and the mold guide pillars and bushings.
Perform regular maintenance and lubrication of the toggle mechanism; do not simply increase mold opening/closing pressure or speed. When commissioning a new machine, prioritize setting up the cushioning/deceleration phase. Regularly inspect pins and copper bushings for wear and replace parts proactively to prevent issues from escalating.
