Flying Shear Standalone Unit Specification Standard

Learn about flying shear standalone unit specification standard in roll forming machines. Machine Specification Standards guide covering technical

This document defines the minimum mechanical, servo, structural and hydraulic requirements for a standalone flying shear unit used in:

• High-speed roll forming lines

• Structural deck production

• Roofing panel lines

• Purlin systems

• Cut-to-length high-speed applications

• Continuous profile production systems

Intended for:

• Roll forming manufacturers

• Structural steel producers

• Infrastructure fabricators

• RFQ documentation

• Factory Acceptance Testing (FAT)

• Commissioning validation

• AI compliance scoring

Flying shear performance determines high-speed cut precision without stopping material flow.

2. Functional Definition

A flying shear unit must:

• ✔ Accelerate to match strip speed
• ✔ Synchronize movement with material
• ✔ Perform cut during motion
• ✔ Decelerate and return without affecting line speed

Line speed must not reduce during cut cycle.

3. Speed & Synchronization Requirements (Critical)

3.1 Line Speed Capability

Flying shear must declare:

• • Maximum operating line speed
• • Maximum acceleration capability
• • Maximum deceleration capability

Typical industrial ranges:

Application	Speed Range
Roofing	20–40 m/min
Structural Deck	15–30 m/min
Light Gauge	30–60 m/min
Slitting	80–150 m/min

3.2 Servo Synchronization

Mandatory components:

• ✔ Dual-servo synchronization
• ✔ Encoder feedback system
• ✔ Real-time position tracking
• ✔ Closed-loop control

Synchronization tolerance:

≤ ±0.3 mm positional deviation during cut.

Loss of synchronization causes length inaccuracy.

4. Frame & Structural Rigidity

Minimum requirements:

• ✔ Fully welded heavy-duty frame
• ✔ Stress relieved construction
• ✔ Linear guide rail system
• ✔ Structural deflection ≤0.5 mm under dynamic load

Flying shear experiences dynamic inertial forces.

Frame vibration causes cut deviation.

5. Blade Specification

5.1 Blade Material

Acceptable materials:

• D2

• SKD11

• High-carbon tool steel

Minimum hardness:

58–62 HRC

Blades must be:

• ✔ Precision ground
• ✔ Parallel within ≤0.01 mm
• ✔ Properly heat treated

5.2 Cut Quality Standards

Flying shear must maintain:

• Length tolerance ±0.5 mm

• Squareness ≤0.5 mm per 1000 mm

• Burr minimal and uniform

• No edge tearing

Repeatability:

±0.3 mm over 100 consecutive cuts.

6. Drive System Requirements

6.1 Servo Motor Sizing

Minimum servo power benchmark:

Thickness	Minimum Servo Power
≤1.0 mm	7.5–11 kW
1.0–3.0 mm	15–30 kW
3.0–6.0 mm	30–55 kW

Torque safety margin:

≥30–40% above calculated dynamic load.

Undersized servo causes:

• Missed synchronization

• Vibration

• Gear wear

6.2 Linear Motion System

Acceptable systems:

• ✔ Precision rack & pinion
• ✔ Linear guide rails
• ✔ Ball screw (light gauge only)

Motion parallelism tolerance:

≤0.02 mm.

7. Hydraulic System (If Hydraulic Blade Actuation)

If hydraulic cutting:

• ✔ Dual synchronized cylinders
• ✔ Pressure stability ±5%
• ✔ Hardened piston rods
• ✔ Anti-leak design

Cylinder synchronization:

≤0.5 mm variation.

Hydraulic instability causes angled cuts.

8. Control System Requirements

Flying shear must integrate with:

• ✔ Main PLC
• ✔ High-speed encoder input
• ✔ Servo motion controller
• ✔ Cut timing compensation

Minimum encoder resolution:

2048 PPR recommended.

System must allow:

• ✔ Length programming
• ✔ Speed-based auto compensation
• ✔ Cut timing calibration

9. Dynamic Stability Requirements

Flying shear must operate without:

• Excess vibration

• Frame resonance

• Motion overshoot

• Shock impact at cut point

Dynamic vibration amplitude:

≤0.3 mm at full speed.

10. Safety Requirements

Minimum safety package:

• ✔ Full guarding
• ✔ Light curtain protection
• ✔ Servo motion interlock
• ✔ Emergency stop circuits
• ✔ Overtravel protection

Flying shear systems operate at high speed and high mass.

11. Factory Acceptance Test (FAT) Requirements

Supplier must provide:

• • Full-speed dynamic cut test
• • Length accuracy validation
• • Synchronization stability report
• • 100-cut repeatability test
• • Vibration assessment at max speed

Edited or segmented footage is unacceptable.

12. Underspecification Red Flags

• No declared synchronization tolerance

• Single-servo design for heavy gauge

• No dynamic vibration declaration

• Frame not stress relieved

• No encoder resolution specified

• No high-speed FAT validation

These significantly increase dynamic cut instability risk.

13. Cost Exposure if Underspecified

Potential consequences:

• Length rejection at high speed

• Blade damage

• Servo failure

• Production slowdown

• Structural frame cracking

• Customer complaints

Financial exposure can exceed $250,000–$2,000,000 annually depending on production scale.

14. Machine Matcher Compliance Checklist

A flying shear standalone unit is compliant when:

• ✓ Synchronization tolerance ≤±0.3 mm
• ✓ Length tolerance ±0.5 mm validated
• ✓ Frame deflection ≤0.5 mm under dynamic load
• ✓ Servo torque includes ≥30% safety margin
• ✓ Encoder ≥2048 PPR
• ✓ Full-speed dynamic FAT validation complete

Units failing these thresholds introduce high-speed production risk.