The mandrel cylinder mount clevis is a structural pivot component used to attach the hydraulic expansion cylinder to the uncoiler mandrel assembly in a roll forming machine.
In hydraulic expanding mandrels, the cylinder generates axial force that drives wedge segments outward to grip the coil. The clevis mount:
Secures the cylinder body or rod end
Allows controlled pivot movement
Transfers expansion force into the mandrel structure
Accommodates slight angular misalignment
Because mandrels handling 10–35 ton coils operate under high hydraulic pressure, the clevis mount must withstand significant mechanical load while maintaining precise alignment.
Though simple in appearance, it is a critical force-transfer component within the expansion system.
A mandrel cylinder mount clevis is:
A forked mounting bracket
Attached to the mandrel housing or frame
Designed to accept a clevis pin
Used to connect the hydraulic cylinder
It forms a hinged connection point.
Provides secure mounting point for hydraulic cylinder.
Allows slight angular articulation during expansion.
Transfers hydraulic expansion force into mandrel body.
Spreads force across mounting structure.
The clevis is typically mounted:
At the rear of the mandrel housing
On the expansion wedge carrier
On a reinforced frame bracket
Between cylinder body and structural plate
Position depends on expansion design.
Standard clevis configuration includes:
Two parallel fork arms
Clevis pin bore
Mounting base plate
Reinforced gussets
The fork shape allows insertion of the cylinder rod eye.
The clevis works with:
Hardened clevis pin
Retaining clip or cotter pin
Bronze or composite bushing
Lubrication fitting (optional)
Pin must resist shear load.
During expansion:
Hydraulic pressure generates axial force
Force is transmitted through rod
Clevis transfers force into mandrel structure
Load magnitude depends on coil gripping requirement.
For 20–35 ton coils:
Larger cylinder bore
Higher hydraulic pressure
Greater force transmission
Thicker clevis arms required
Structural integrity is critical.
The clevis allows:
Minor angular movement
Compensation for frame flex
Reduction of bending stress on cylinder rod
Rigid mounting without pivot may cause rod damage.
Mandrel clevis mounts are typically made from:
High-strength carbon steel
Alloy steel plate
Machined billet steel
Welded reinforced steel
Material must resist bending and fatigue.
Clevis may be:
Welded to frame
Bolted to reinforcement plate
Integrated into machined housing
Reinforced with gusset plates
Mount strength must exceed hydraulic load.
The clevis pin experiences:
Double shear load
Cyclic loading
Shock load during rapid expansion
Pin diameter must be correctly sized.
Proper clevis design ensures:
Even load across fork arms
Minimal stress concentration
Reduced risk of cracking
Arm thickness influences strength.
If cylinder axis shifts slightly:
Clevis pivot prevents bending
Rod seal stress is reduced
Cylinder lifespan improves
Articulation protects hydraulic components.
Continuous operation creates:
Repeated load cycles
Small oscillating movements
Long-term fatigue stress
Material selection must consider fatigue resistance.
Some clevis assemblies include:
Grease fitting
Bronze bushing
Oil-impregnated sleeve
Lubrication reduces wear at pivot point.
Common wear areas include:
Pin surface
Bushing inner diameter
Clevis bore
Mounting holes
Regular inspection prevents elongation.
If clevis fails:
Cylinder may detach
Expansion mechanism becomes unstable
Mandrel gripping fails
Severe mechanical damage may occur
Clevis integrity is essential.
Proper installation includes:
Aligning cylinder rod eye between fork arms
Inserting clevis pin
Installing retaining clip
Checking smooth pivot movement
Verifying no excessive clearance
Correct fit ensures stability.
Clevis must align with:
Cylinder axis
Mandrel expansion direction
Wedge carrier movement
Misalignment increases rod side loading.
Clevis mounts are typically:
Painted
Powder coated
Zinc plated (pins)
Greased at pivot
Corrosion weakens structural capacity.
Replace clevis or pin if:
Bore elongation visible
Crack formation detected
Pin wear exceeds tolerance
Excessive play develops
Wear leads to alignment instability.
Engineers evaluate:
Maximum hydraulic pressure
Cylinder bore size
Required expansion force
Shear capacity of pin
Safety factor
Design must exceed peak load.
The clevis connects:
Hydraulic Cylinder → Clevis → Mandrel Frame → Expansion Wedge
It is a primary force-transfer link.
The clevis ensures:
Secure cylinder mounting
Controlled expansion motion
Safe coil gripping
Stable expansion force application
Failure can compromise entire uncoiler system.
The mandrel cylinder mount clevis is a structural pivot component that connects the hydraulic expansion cylinder to the mandrel assembly in a roll forming machine.
It:
Transfers hydraulic force
Allows controlled pivot movement
Protects cylinder from side loading
Supports heavy coil expansion
Ensures stable mandrel gripping
Though compact, it is a critical load-bearing component in hydraulic mandrel expansion systems.
It connects the hydraulic cylinder to the mandrel structure.
It prevents side loading on the cylinder rod.
Yes — it transfers full hydraulic expansion force.
Alignment issues and unstable expansion may occur.
Absolutely — higher hydraulic force requires stronger clevis design.
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