ALAS Rebar Cutting Blades: Maintenance & Replacement

ALAS Rebar Cutting Blades: Maintenance & Replacement – 5 Practical Tips to Extend Service Life

As the most wearable core part of both electric and hydraulic rebar cutters, premium rebar cutter blades dominate the overall operating cost of rebar processing. When counting blade replacement labor and production downtime losses, blades account for nearly one-third of total consumable expenses.

ALAS premium rebar cutting blades are manufactured from three high-performance alloy steel grades: 9CrSi, Cr12MoV and H13, compatible with all mainstream rebar cutting machines. With the 5 field-proven maintenance tips below, users can easily extend ALAS blade service life by more than 50% and effectively reduce operating costs.

1. Complete Standard Run-In for New Blades

Brand-new blades have tiny edge burrs and internal residual stress. Directly cutting large-diameter or high-strength rebar will lead to edge chipping and early damage.

Standard Run-In Steps:

• Finish the first 10 cutting cycles with small-diameter φ12 rebar

• Apply molybdenum disulfide grease to the cutting edge after each cut (ordinary grease is not recommended)

• Remove fine burrs with a fine oil stone after completing the run-in process

Strict Prohibition: Do not use new blades to cut maximum-specification rebar or HRB500 high-strength rebar directly.

2. Adjust Blade Clearance According to Rebar Material

Reasonable blade clearance is the key to smooth cutting and long blade life. Follow the unified standard formula:

Clearance = Rebar Diameter × (0.8% ~ 1.2%)

Applicable parameters for common materials:

• Q235 round steel: 0.8%

• HRB400 deformed rebar: 1.0%

• HRB500 high-strength rebar: 1.2% (reserved for larger steel springback)

Adjustment Operation:

Loosen the blade holder bolts, measure the gap between movable and fixed blades with a feeler gauge, adjust the clearance via eccentric shaft or gaskets, and fasten the bolts with a torque of 200-300 N·m.

Calibration Cycle: Recalibrate the clearance after processing every 200 tons of rebar or replacing/rotating blades.

3. Rotate & Reuse Symmetrical Blades Fully

All standard ALAS rebar cutting blades adopt a four-sided symmetrical design, with 4 available cutting edges for maximum utilization.

Usage Strategy:

After 1000 cuts or when slight dullness appears on one edge, rotate the blade 90° to switch to a new cutting edge. Grind the blade only after all four edges are worn out.

This scientific usage method can quadruple the blade service life and greatly reduce replacement frequency and machine downtime.

Note: Blade clearance must be recalibrated every time the blade is rotated.

4. Standard Blade Grinding & Clear Scrap Standards

4.1 When to Grind Blades

Perform professional grinding in time if any of the following problems occurs:

• Edge chipping > 2mm

• Cut surface burr height > 1mm

• Obvious increase in cutting resistance during operation

4.2 Professional Grinding Specifications

• Equipment: Use professional surface grinders (e.g. M7120). Manual grinding with angle grinders is forbidden

• Grinding wheel grit: 46# ~ 60#

• Single feed depth: ≤ 0.05mm

• Cooling: Use sufficient coolant to avoid edge annealing and hardness loss

• Edge treatment: Reserve a 0.2mm rounded edge after grinding to prevent brittle chipping

4.3 Blade Scrap Criteria

Replace ALAS blades immediately if any of the following conditions occurs:

• Remaining blade thickness after grinding is less than 1/3 of the original thickness

• Visible cracks appear on the blade body

• Mounting screw holes are slippery or deformed

5. Daily Maintenance, Storage & Recycling

5.1 Daily Maintenance (End of Each Shift)

Blow off all iron scraps in the blade groove with compressed air, then coat the blade with a thin layer of high-quality anti-rust oil. Do not use impure waste engine oil.

5.2 Long-Term Storage for Spare Blades

Coat spare ALAS blades with anti-rust oil, wrap with oil paper, and store in dry wooden or plastic boxes. Keep the storage environment humidity below 60%.

5.3 Waste Blade Recycling

ALAS blades are made of high-value alloy tool steel (9CrSi, Cr12MoV, H13) containing chromium, molybdenum and other alloy elements. Waste blades can be recycled as alloy tool steel, realizing cost recovery and environmental protection.

ALAS Blade Material Selection Guide

• 9CrSi: High hardness, excellent wear resistance and cost performance. Ideal for general construction sites, suitable for Q235 round steel and conventional HRB400 rebar cutting.

• Cr12MoV: Superb wear resistance and fatigue resistance, resistant to long-term dulling. The best choice for large processing plants and 24-hour continuous mass production.

• H13: Outstanding toughness, impact resistance and thermal stability. Specially designed for heavy-duty working conditions, thick rebar and HRB500 high-strength rebar cutting.

Common Blade Faults & Quick Troubleshooting

5 Core Maintenance Tips Quick Reference