Flying Shear Standalone Unit Specification Standard

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.