AISI D2 Fixed Cutting Blades for Automated PC Bar Spun Pile Shearing Machines

1. Common Failures

High-speed shearing of high-tensile PC steel bars subjects fixed blades to severe impact and sliding abrasion. Wear along the blade contact face expands the shearing clearance, causing wire deflection during the stroke. This results in heavy end-face burrs, non-perpendicular cut faces, inconsistent blank lengths, or sudden blade chipping that halts the production line.

2. Technical Features

ALAS fixed cutting blades are forged from refined AISI D2 alloy tool steel. Multi-stage vacuum quenching combined with precision surface grinding delivers stable thickness tolerances and rigid seating alignment. This maintains a precise, consistent cutting edge across high-volume spun pile manufacturing lines without the need for manual shimming.

3. Key Technical Standards

Carbide Microstructure: Forged from vacuum-quenched AISI D2 steel (58–60 HRC) with uniform carbide distribution to resist severe abrasive mill-scale wear and edge deformation under high-frequency impacts.

Shearing Surface Finish: Support and contact faces are precision ground to a standard Ra 0.8 μm to Ra 1.6 μm profile .

Dimensional Tolerance: Strict thickness control within ±0.03 mm eliminates tool micro-wobbling, preventing micro-chipping and blade deformation under dynamic hydraulic loads.

4. Specification Matrix

• Component Type: Fixed Cutting Blade

• Substrate Metallurgy: Forged AISI D2 Steel

• Hardness: 58–60 HRC (Vacuum Quenched)

• Target Wire Range: Φ7.1 mm, Φ9.0 mm, Φ10.7 mm, Φ12.6 mm

• Primary Function: Stationary shear blade providing stable support and accurate shearing clearance for PC steel bar cutting.

5. Technical Troubleshooting (FAQ)

Q: What causes burred or angled cut faces during PC steel bar shearing, and how do ALAS blades resolve this?

A: This is primarily driven by expanded shearing clearance due to wear on the fixed blade's contact face. When the gap between the blades exceeds the recommended limits, the PC bar bends rather than fracturing cleanly. ALAS vacuum-quenched AISI D2 fixed blades maintain a rigid contact boundary across extended production runs, keeping the clearance within specification to deliver clean, perpendicular cuts.

Q: What is the optimal preventative cleaning and replacement routine for fixed cutting blades?

A: Blades are run continuously until catastrophic failure, edge chipping, or cracking occurs, requiring immediate direct replacement rather than regrinding.