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Press Brake Bending Machines Maintenance Guide

SC machinery press brake bending machines maintenance mainly focuses on four major modules: the hydraulic system, the linear encoder synchronization system, the compensation system, and the back gauge mechanism.

The overall approach follows:

Pressure stabilization + temperature control → ensuring synchronization accuracy (Y1/Y2)
Clean hydraulic oil → reducing proportional valve blockage
Linear guide/screw lubrication → ensuring back gauge positioning accuracy
Periodic calibration → maintaining stable factory precision
This applies to all SC press brake bending machine models

1. CNC Press Brake Bending Machines Maintenance Goals and Principles

The core of scientific maintenance is:

Ensuring accuracy, ensuring safety, extending lifespan, reducing failure rate, and ensuring traceability management

CNC hydraulic press brake bending machines maintenance follows four principles:

Preventative maintenance as the primary method: reducing sudden failures
Data-driven maintenance: recording pressure, oil temperature, and accuracy drift
Standardized operation: using the same set of inspection standards (e.g., 1m square, feeler gauge, coordinate measuring machine)
Safety first: power off, pressure release, screen lock, and stop foot pedal operation.

2. Routine Maintenance

1) Pre-operation Inspection

Inspection Items	Standard	Objectives
Hydraulic oil level	Oil level maintained at 1/2–2/3 of the oil window	Avoid cavitation and cavitation
Start system alarm	No alarms, industrial control normal	Ensure system stability
Y1/Y2 zero point	Successfully returned to origin, no deviation	Improve repeatability
Back gauge origin	No stroke jamming	Ensure positioning accuracy
Mold installation	Mold locked, no missing corners	Prevent mold collision and off-center loading

2) In-operation Inspection:

Observe the oil temperature; it should not exceed 55°C (as low as 40°C for servo machines).
The hydraulic system should be free of vibration and abnormal noise.
The back gauge should move smoothly without jumping.
Check for bending dimension drift; if it is >0.2mm, it needs to be corrected promptly.

3) Post-operation Maintenance:

Clean the bottom of the slide block and the surface of the worktable.
Remove metal shavings from the mold and V-shaped opening.
Turn off the controller and power to the machine.
Drain the air filter once.

3. Weekly Maintenance (Key Maintenance)

1) Lubrication Maintenance (depending on model)

Parts	Requirements
Linear guide, guide rail	Add lithium-based grease or check the level of automatic lubrication
Lead screw (back gauge)	Sufficient grease, no abnormal noise during operation
Hinge, connecting rod	Add 2-3 drops of lubricating oil to avoid dry friction

2) Alignment and Accuracy Check

Slider left-right balance check (Y1/Y2 difference ≤ 02mm)
Back gauge parallelism check (error ≤ 1mm)
Mold plane contact check to prevent “off-center loading”

3) Electrical System Check

Main contactor temperature rise
Servo driver cooling fan
Clean electrical cabinet cooling filter
Emergency stop and foot switch function test

4. Monthly Maintenance (Deep Maintenance)

1) Hydraulic System Inspection

Is the hydraulic oil emulsified (oil color turned white or cloudy)?
Filter differential pressure
Is the oil pump noise increased?
Check all oil pipe joints for leaks.
Is the valve coil temperature normal?

2) Mechanical Part Calibration

Worktable straightness check
Lower die groove wear check (wear >0.3mm requires replacement)
Check for “wavy wear” on the die guide rail
Slider limit switch position calibration

3) Press Brake Back Gauge Comprehensive Calibration

Includes:

X-axis bilateral consistency check
R/Z-axis limit and parallelism
Lead screw backlash compensation

5. Semi-annual Maintenance (Professional-Grade Maintenance)

1) Hydraulic Oil Maintenance

Inspect oil quality every 6 months: viscosity, contamination.
Recommended hydraulic oil replacement every 18–24 months (can be reduced to 12–18 months for high-intensity use).
Replace oil filters (suction, return, and fine filters)

2) Comprehensive Structure and Precision Calibration

Mandatory items:

Slider verticality
Slider synchronization accuracy (Y1/Y2)
Reset back gauge servo motor positioning error

3) Safety System Maintenance

Recalibrate grating protection system
Test photoelectric sensor sensitivity
Test emergency stop circuit safety relay

6. Annual Maintenance (Overhaul Level)

1) Comprehensive Precision Testing

Slider repeatability (≤02mm)
Bending angle consistency
Test worktable deflection compensation system

2) Key Component Inspection

Main cylinder seal (oil leakage)
Oil pump wear and noise
Back gauge lead screw and coupling
Linear guide and slider wear

3) Control System Upgrade

CNC software upgrade
Back up parameters and machine data
Check touchscreen sensitivity

7. Key Maintenance Precautions Of Press Brake Bending Machine

1) Avoid Off-center Loading (Most Likely to Cause Major Repairs)

The work piece should be centered as much as possible when bending.
Off-center load processing must be performed in “Off-center Load Mode” (if the system supports it).

2) Mold Management System

Use uniform mold numbering.
Establish mold life records.
Use molds intermittently to avoid prolonged high loads on a single mold.

3) Oil Temperature Control

Excessive oil temperature can cause:

Slider asynchrony
Dimensional drift
Shortened oil seal life
Install an oil cooler if necessary

4) CNC System Backup

Back up parameters monthly.
Back up immediately if any abnormality occurs.
Pay special attention to: proportional valve parameters, compensation parameters, and process database.

8. Expert Maintenance Recommendations (Increase Lifespan by 30%)

Perform bending angle consistency verification every 3 months.
Use branded hydraulic oil.
In high-temperature areas, a cooling device is recommended.
Perform precision repair annually, which can effectively extend mold life by 20-30%.
Regularly check the compensation system for “false compensation”.

9. Summary

Core Maintenance Principles of Press Brake Bending Machines:

Stable oil temperature + clean oil → Ensure Y1/Y2 synchronization accuracy
Regular lubrication + cleaning of lead screw/linear guide → Ensure back gauge positioning accuracy
Periodic calibration → Maintain overall machine accuracy
Strict parameter management → A prerequisite for the stability and reliability of the EL15T / ESA 630 system
Avoid uneven loading → Extend the lifespan of the frame, mold, and cylinder

Special Recommendations (Critical):

The hybrid servo system is particularly sensitive to oil quality → It must be kept clean
Cooling devices are recommended for high-temperature workshops
CNC parameters must not be arbitrarily modified (proportional valve, PID, compensation curve)
Uneven loading of the mold is strictly prohibited
Iron filings on the linear guide must be cleaned daily