1. Thickness Matching & Steel Grades (Professional Material Grading)
This category of hydraulic guillotine shear blades is classified by target plate thickness and carbon material composition to prevent edge micro-chipping under vertical gate-type shearing tonnages.
Thin Sheet Shearing (Under 3 mm): Utilizing certified 9CrSi Alloy Steel (Hardness: HRC 58–60). This matrix delivers cost-effective wear resistance and minimal heat-treatment distortion, optimized for cold-rolled steel, galvanized sheets, and light non-ferrous metals.
Medium Carbon Plate Shearing (0.5 mm – 12 mm): Utilizing certified 6CrW2Si Tool Steel (Hardness: HRC 56–58). Formulated with tungsten-silicon grain refinement, this grade delivers high baseline structural toughness to absorb repetitive impact on standard mechanic and hydraulic machinery beds.
High-Volume & Sticky Alloys (Standard Gauge): Utilizing certified Cr12MoV / SKD11 (Hardness: HRC 58–60). High carbon-chromium chemistry optimizes edge retention and provides superior anti-galling properties against sticky silicon steel sheets.
Every shear knife undergoes full-length vacuum heat treatment and precision surface grinding to ensure microstructural uniformity, consistent hardness distribution, and reliable industrial shearing performance for diverse metal materials.
Tool Steel Grade | Hardness Range (HRC) | Core Structural Property | Main Shearing Applications |
|---|
9CrSi Alloy Steel | 58–60 | Low heat treatment distortion; cost-effective carbon alloy matrix | Thin cold-rolled steel sheets, galvanized metal, aluminum, copper, Q195/Q235 mild steel. |
6CrW2Si Tool Steel | 56–58 | Tungsten-silicon matrix refinement; high mechanical toughness | Standard mechanical and hydraulic shears processing 0.5–12 mm conventional steel plates. |
Cr12MoV / SKD11 | 58–60 | High carbon-chromium composition; superior anti-galling | High-volume production of carbon steels, silicon steel sheets, and sticky metal alloys. |
Note: Specialized heavy-duty elements like H13, LD, and DC53 are excluded from this category to focus on standard workshop manufacturing requirements, maximizing tool cost efficiency.
3. Machined Tolerances & Structural Alignment
All replacement knives are finished on long-bed surface grinders equipped with constant liquid cooling loops to eliminate thermal stress micro-cracks.
Straightness & Parallelism: Held within ≤ 0.02 mm across the total blade length, preventing sudden hydraulic pressure spikes and machine vibrations.
Thickness Tolerances: Ground precisely to ±0.02 mm to ensure a flat, uniform assembly plane when locking segmented section sets into the main machine tool holder.
4. Mechanical Blade Clearance Guidelines
Correct blade gap calibration limits burr formation, protects drive components, and minimizes material deformation. Clearance settings are verified under standard industrial shearing parameters:
Mild Steel & Thin Sheets: Side clearance must be set between 5% to 10% of the material thickness.
Medium Carbon & Alloy Plates: Side clearance must be set between 8% to 12% of the material thickness.
Operational Rule: Excessively tight clearance leads to edge rubbing and frictional overheating; excessive clearance yields torn perpendicular edges and prominent drawing burrs.
5. Quality Control Protocols & Global Machine Compatibility
Production Workflow Execution: All manufacturing procedures are localized within a unified facility utilizing computerized vacuum hardening and precision CNC surface grinding.
Precision Finishing & Calibration: Straightness and parallelism are maintained strictly within ≤ 0.02 mm to prevent shear bed vibration. Hardness profiling undergoes 100% manual Leeb tester verification across multiple surface grid coordinates to eliminate localized soft spots or surface decarburization.
Global OEM Machine Compatibility: Finished replacement knives are machined to match the exact physical mounting layout, bolt hole pitches, countersinks, and edge profiles of international brands, including Amada, LVD, Accurpress, Cincinnati, Pearson, Edwards, Gasparini, Bystronic, Haco, and Durma.
B2B Custom Procurement: Custom fabrication is executed based on technical blueprints (DXF, PDF, or STP formats) with a standardized minimum order quantity (MOQ) of 1 piece.
6. Export Logistics Packing Specification
To guarantee pristine cutting edges during extended maritime transport and warehouse storage, all components comply with the following professional industrial protective protocol for global export delivery:
Chemical Preservation: Deep surface coating utilizing heavy-duty rust-preventative industrial oil.
Moisture Isolation: Full encapsulation within multi-layer volatile corrosion inhibitor (VCI) vapor-barrier protective film.
Mechanical Defense: Secure crating within reinforced, heavy-duty ISPM 15 certified sea-worthy wooden boxes lined with internal high-density foam cushioning to absorb physical transit impact.
7. Technical FAQ for Shearing Machine Blades
A: Edge defects primarily stem from uneven blade flatness, non-parallel shearing planes, or uncalibrated side clearances. Blades ground within a strict straightness tolerance of ≤ 0.02 mm maintain uniform spatial alignment across the machine tool holder, preventing localized plate tearing and sheet deflection during high-speed production runs.
Q2: When must a rectangular guillotine blade be rotated or decommissioned for regrinding?
A: Standard rectangular profiles feature a 4-way indexable configuration. A blade must be rotated 90 degrees or removed for grinding when finished parts exhibit prominent shear deformation, when the machine generates abnormal metallic knocking, or when visual inspection reveals micro-chipping or radius edge rounding. The 4-edge design permits 3 precise rotational adjustments to utilize all fresh cutting surfaces before grinding is required.
Q3: How does vacuum heat treatment balance structural hardness with impact toughness?
A: Computerized multi-stage vacuum quenching and secondary tempering cycles eliminate internal thermal stresses while preventing irregular grain boundary segregation. This allows alloy steels like 9CrSi and Cr12MoV to hit a uniform hardness range of HRC 56–60 while maintaining core fracture toughness, matching strict mechanical impact standards without brittle edge cracking.
Q4: Can replacement knives be engineered for non-standard or legacy machine configurations?
A: Yes. Custom manufacturing supports standard, obsolete, or specialized machine tool models. Production requires exact drawing documentation or physical part measurement maps confirming total segmented lengths, bolt hole center distances, and countersink geometries. Complete engineering verification and wholesale factory quotation data are processed within 24 hours of technical file submission.
