Injection Molding Machine Hydraulic Overheating: Hazards, Causes & Troubleshooting Tips
Proper maintenance of injection molding machines takes continuous time and effort. It helps reduce unexpected downtime and mechanical failures. Many molders encounter a common issue during production: excessive hydraulic oil temperature. Repeated overheating will inflict serious, lasting damage to your injection molding equipment.
What Are The Dangers Of High Hydraulic Oil Temperature?
Thermal deformation of mechanical componentsHydraulic moving parts feature different thermal expansion coefficients. High heat shrinks the fitting clearance between mating parts, which may cause components to seize and malfunction. System transmission accuracy drops, and overall hydraulic performance deteriorates.
Reduced hydraulic oil viscosityHigh temperature reduces oil viscosity and increases internal and external leakage. Pump volumetric efficiency and overall hydraulic system efficiency decline significantly. The lubricating oil film on sliding valve parts becomes thinner or breaks completely. Friction increases and component wear accelerates.
Deformation and premature aging of rubber sealsHeat deforms rubber sealing parts, speeds up aging and failure. Sealing capacity and service life are reduced, resulting in hydraulic oil leakage.
Accelerated oxidation and deterioration of hydraulic oilHigh temperature speeds up oil oxidation and shortens oil service life. Oxidation by-products build up as sludge, blocking small orifices and valve openings. Pressure valves can get stuck. Metal pipelines expand under heat, bend and may even rupture.
Degraded component performance and cavitationAir dissolved in hot hydraulic oil separates out and forms cavitation. This phenomenon impairs the stability and performance of the entire hydraulic system.
Key Takeaway
Rapid temperature rise can trigger all the above defects at once. Machine operators must stay alert to overheating symptoms. Always identify the root cause and resolve faults promptly to avoid permanent damage to expensive machine parts.
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