A well-maintained CNC bending machine can operate reliably for 15 to 20 years. A neglected one starts showing problems in year three. The difference is not the quality of the machine — it is the discipline of the maintenance program.
Daily checks take five minutes and prevent 80% of common failures. Verify hydraulic oil level and temperature. Inspect the clamp and pressure die for wear or damage. Clean the mandrel and wiper die of debris and metal chips. Check that emergency stops and safety light curtains respond correctly. These simple habits catch problems before they become downtime events.
Weekly lubrication is the single highest-impact maintenance task. All linear guides, ball screws, and pivot bearings need clean, fresh lubricant. Use the manufacturer-recommended grease type and quantity — over-greasing attracts dust and under-greasing accelerates wear. HEQI machines have labeled lubrication points with QR codes that link to video instructions, making the task simple even for new maintenance staff.
Monthly tasks include checking belt tension on servo motors, inspecting electrical connections for corrosion or looseness, and verifying calibration of the angle encoder. A drifting encoder causes systematic bend angle errors that are hard to diagnose. A quick monthly calibration check using a reference standard tube prevents this.
Quarterly maintenance should include a full hydraulic system inspection: filter changes, hose condition checks, and valve response testing. Hydraulic oil degrades over time, and contaminated oil damages pumps and valves. Change the oil and filters every 2,000 operating hours or quarterly, whichever comes first.
Annual overhauls involve deeper inspections: measuring wear on the bending die and clamp surfaces, checking the machine frame for stress cracks, updating control software, and replacing consumable parts before they fail. Plan this during a scheduled shutdown so it does not disrupt production.
Keep a maintenance log. Every check, every repair, every part replacement should be recorded with date, technician name, and notes. This log becomes invaluable when diagnosing recurring issues and is often required for warranty claims.
HEQI provides a comprehensive maintenance manual with every machine and offers annual service contracts where our technicians visit your factory to perform inspections and preventive maintenance. The cost of a service contract is typically recovered in avoided downtime within the first year.