The shear hydraulic hose assembly is the high-pressure flexible fluid line that connects the hydraulic power unit (HPU), manifold, and cut-off cylinder in a roll forming machine.
It is responsible for:
Delivering pressurised oil to the shear cylinder
Returning oil to the reservoir
Accommodating movement and vibration
Withstanding pressure spikes
Maintaining sealed, leak-free operation
In both hydraulic stop-cut and flying shear systems, hose assemblies are critical for reliable fluid transfer. A failure in this component can immediately stop production and create serious safety hazards.
A hydraulic hose assembly consists of:
Reinforced flexible hose
Crimped end fittings
Ferrules (crimp sleeves)
Sealing interfaces (O-ring, flare, BSP, etc.)
It is a complete pressure-rated fluid transfer system, not just the rubber hose.
Transports oil from pump to cylinder.
Carries oil back to tank.
Absorbs mechanical vibration from frame.
Allows flexibility in flying shear systems.
Handles rapid pressure spikes during cutting.
Hydraulic hose assemblies are typically found:
Between HPU and shear manifold
Between manifold and cylinder pressure port
Between return port and tank
On flying shear moving carriage systems
Flying shears require flexible routing due to carriage travel.
A typical high-pressure hydraulic hose includes:
Inner synthetic rubber tube (oil compatible)
Reinforced braided steel wire layers
Outer protective rubber cover
Heavy-duty systems may use multi-spiral wire reinforcement.
Typical pressure ratings in roll forming shear systems:
250 bar (standard systems)
350+ bar (heavy-gauge cutting)
Higher burst rating for safety margin
Hose must exceed maximum system pressure.
Common fitting types include:
BSPP / BSPT
NPT
JIC 37° flare
ORFS
SAE O-ring boss
Correct fitting selection ensures leak-free connection.
Ferrules:
Secure hose to fitting
Maintain pressure seal
Prevent hose blow-off
Crimp quality directly affects safety.
In stop-cut shear systems:
Hoses are typically fixed
Pressure spikes occur during blade penetration
Proper reinforcement prevents expansion
Stable pressure ensures consistent cutting force.
In flying shear systems:
Hoses must flex repeatedly
Movement causes bending stress
Fatigue resistance is critical
Proper routing prevents premature wear.
During blade fracture:
Sudden pressure spike occurs
Hose expands slightly
Reinforcement resists bursting
Quality hose prevents catastrophic rupture.
Hoses must not exceed minimum bend radius.
Excessive bending can cause:
Reinforcement wire fatigue
Internal cracking
Restricted flow
Premature failure
Correct routing is essential.
Proper installation includes:
Avoiding sharp bends
Securing with clamps
Preventing rubbing against frame
Avoiding twisting
Improper routing increases failure risk.
Hydraulic oil temperature can reach:
40–70°C in typical systems
Higher under heavy-duty operation
Hose materials must withstand operating temperature.
Protective features may include:
Spiral wrap guards
Abrasion-resistant outer cover
Protective sleeves
Flying shear systems often require additional protection.
Hydraulic hose assemblies may fail due to:
Cracked outer cover
Wire reinforcement fatigue
Crimp failure
Seal leakage
Overpressure rupture
Regular inspection prevents downtime.
Indicators include:
Oil leaks
Bulging hose
Cracked outer jacket
Sudden pressure loss
Reduced cutting force
Immediate replacement is required if damaged.
Routine checks should include:
Visual inspection
Leak detection
Checking clamp integrity
Verifying pressure stability
Hoses should be replaced periodically in high-cycle systems.
Hydraulic hoses carry:
High-pressure oil
Risk of oil injection injury
Risk of sudden rupture
Always depressurize system before service.
Hose assemblies connect:
Pressure ports
Return ports
Flow control valves
Check valves
Manifold blocks
They form the flexible link in the hydraulic circuit.
The shear hydraulic hose assembly is the reinforced high-pressure fluid transfer line that connects the hydraulic power system to the cut-off cylinder in a roll forming machine.
It:
Delivers cutting force
Accommodates vibration and movement
Withstands pressure spikes
Maintains sealed operation
Supports safe hydraulic performance
Though flexible and often overlooked, it is one of the most safety-critical components in the hydraulic cut-off system.
It transfers high-pressure oil to and from the cut-off cylinder.
It must exceed system pressure to prevent rupture.
Yes, repeated movement increases fatigue.
Overpressure, bending stress, abrasion, or poor crimping.
Yes, especially in high-cycle roll forming systems.
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