Typical Problems Found in Used Roll Forming Machines | Inspection Guide
Typical Problems Found in Used Roll Forming Machines
Introduction
Used roll forming machines can offer significant value for manufacturers seeking to expand production capacity at a lower cost than purchasing new equipment. Many roll forming machines remain structurally sound even after decades of operation due to their heavy-duty construction.
However, machines that have been used for many years often develop mechanical, electrical, and operational issues that must be addressed before reliable production can continue.
Understanding the typical problems found in used roll forming machines helps engineers, technicians, and buyers identify potential risks and plan refurbishment projects effectively.
This guide explains the most common problems encountered in used roll forming machines and how these issues affect machine performance.
Wear in Roll Tooling
Roll tooling is one of the most critical components in any roll forming machine. These rollers shape the metal strip into the final profile through progressive forming stages.
Over time tooling surfaces experience wear due to constant friction and forming pressure.
Typical tooling problems include:
Surface scoring
Profile distortion
Uneven roller wear
Edge damage
Tooling misalignment
When roll tooling becomes worn or damaged, the formed product may develop defects such as:
Profile shape inconsistencies
Uneven rib heights
Surface scratches
Dimensional inaccuracies
Tooling refurbishment or replacement is often required when rebuilding used roll forming machines.
Bearing Wear
Bearings support rotating shafts throughout the roll forming machine and allow smooth rotation under heavy loads.
Because bearings operate continuously during production, they eventually wear out.
Common signs of bearing wear include:
Excessive vibration
Noise during operation
Heat buildup
Loose shaft movement
Bearing failure can cause misalignment of roll stands and accelerate wear in other machine components.
During refurbishment, bearings are typically replaced to restore smooth machine operation.
Shaft Damage or Misalignment
Shafts transmit forming pressure and support roll tooling along the machine.
Shaft problems are common in older roll forming machines, particularly those that have been heavily used.
Typical shaft issues include:
Shaft bending
Surface scoring
Wear at bearing contact areas
Excessive shaft runout
Misaligned shafts can cause uneven forming pressure across the strip, resulting in poor product quality.
Shaft repair or replacement is often necessary during refurbishment projects.
Drive System Wear
The drive system powers the roll forming machine and must maintain stable speed during production.
Older machines frequently experience drive system wear after years of operation.
Common drive system problems include:
Worn drive chains
Gearbox wear
Motor overheating
Coupling misalignment
Drive shaft damage
Drive system problems can cause inconsistent forming speed and increased vibration.
Repairing or replacing drive components restores smooth machine operation.
Roll Stand Alignment Issues
Roll stands must maintain precise alignment to ensure consistent forming pressure across the strip.
Over time roll stands may become misaligned due to:
Frame movement
Loose mounting bolts
Bearing wear
Improper maintenance
Roll stand misalignment can cause several production problems including:
Panel distortion
Uneven forming pressure
Material tracking issues
Excessive tooling wear
Correcting roll stand alignment is an important step in refurbishing used machines.
Frame Distortion or Structural Damage
Although roll forming machine frames are generally very durable, structural problems can occasionally develop.
Possible structural issues include:
Frame twisting
Cracked welds
Corrosion damage
Base plate distortion
Frame damage can significantly affect machine alignment and product quality.
In severe cases structural repairs may be required before refurbishment can proceed.
Hydraulic System Problems
Many roll forming machines use hydraulic systems for cutting, punching, or automated adjustments.
Older hydraulic systems often develop problems such as:
Hydraulic fluid leaks
Pressure loss
Worn seals
Valve failures
Pump wear
Hydraulic contamination caused by debris or degraded oil can also reduce system performance.
Refurbishing hydraulic systems usually involves replacing seals, flushing hydraulic fluid, and servicing pumps and valves.
Electrical System Failures
Electrical systems in older roll forming machines may become unreliable due to aging components and outdated technology.
Common electrical problems include:
Faulty wiring
Sensor failures
Outdated PLC systems
Control panel faults
Motor drive failures
Older control systems may also lack modern diagnostic capabilities, making troubleshooting more difficult.
Electrical upgrades are often included during refurbishment to improve machine reliability.
Encoder and Sensor Problems
Encoders and sensors play an important role in controlling cut length, machine synchronization, and automation functions.
Problems with sensors may cause:
Incorrect cut lengths
Synchronization errors
Machine shutdowns
Erratic production operation
Replacing outdated sensors and encoders improves production accuracy.
Excessive Machine Vibration
Vibration is a common issue in older roll forming machines.
Excessive vibration may be caused by:
Bearing wear
Drive system imbalance
Tooling misalignment
Loose machine components
Shaft damage
Vibration can lead to poor product quality and accelerate mechanical wear.
Identifying the source of vibration is an important step during machine evaluation.
Poor Machine Maintenance
One of the most common causes of problems in used roll forming machines is poor maintenance.
Machines that have not been regularly serviced may suffer from:
lubrication failure
corrosion
contaminated hydraulic systems
loose components
improper machine adjustments
Refurbishment often corrects these issues by restoring proper machine condition.
Tooling Setup Errors
Improper tooling setup is another issue often discovered during inspection of used roll forming machines.
Examples include:
incorrect roll gap settings
improper roll positioning
missing spacers
incorrect tooling sequence
Improper setup can cause serious production problems even if the machine itself is in good condition.
Correct tooling installation and alignment are essential for proper machine operation.
Cut Length Accuracy Problems
Cutting systems used in roll forming machines must operate in precise synchronization with forming speed.
Problems in cutting systems may include:
flying shear timing errors
encoder calibration problems
hydraulic cutting system wear
These issues can result in inconsistent cut lengths and production defects.
Refurbishment often includes recalibrating the cutting system.
Identifying Problems During Machine Inspection
Before purchasing or refurbishing a used roll forming machine, technicians should perform a detailed inspection.
Inspection should include:
mechanical evaluation
tooling inspection
drive system testing
hydraulic system evaluation
electrical system testing
machine alignment checks
Operational testing can reveal issues that may not be visible during static inspection.
Benefits of Addressing Problems During Refurbishment
Correcting machine problems during refurbishment offers several advantages.
Improved production reliability
Reduced maintenance costs
Better product quality
Extended machine lifespan
By addressing these issues during refurbishment, manufacturers can restore used roll forming machines to reliable operating condition.
Frequently Asked Questions
Are problems common in used roll forming machines?
Yes. Machines that have been used for many years often develop mechanical and electrical wear that must be addressed during refurbishment.
Can most problems be repaired during refurbishment?
Many problems can be repaired by replacing worn components and upgrading outdated systems.
Should used roll forming machines always be refurbished?
Not always. If the machine frame is severely damaged or the profile is obsolete, replacing the machine may be more practical.
How long does it take to repair common machine problems?
Minor repairs may take a few days, while major refurbishment projects can take several weeks.
Conclusion
Used roll forming machines can provide excellent value when properly evaluated and refurbished. However, years of operation often lead to mechanical wear, tooling damage, drive system deterioration, and electrical problems.
Identifying these issues during inspection allows manufacturers to plan effective refurbishment projects and restore machine performance.
By addressing common problems such as bearing wear, shaft damage, tooling deterioration, and electrical system failures, refurbished roll forming machines can operate reliably for many additional years.
Understanding the typical problems found in used roll forming machines helps buyers and engineers make informed decisions about refurbishment and equipment investment.