Inspection and Warehousing Standards for Slitting Machine Blades

Inspection and Warehousing Standards for Slitting Machine Blades 

I. Visual Inspection 
1. Visual Check  
   - Inspect the blade surface for cracks, chipping, rust, or significant scratches.  
   - Verify that blade markings (material, specifications, batch number) are clear and legible.  

2. Dimensional Measurement  
   -Outer Diameter (use an outside micrometer, tolerance ±0.01mm)  
   - Inner Diameter (use an inside micrometer, must match the shaft with ≤0.02mm clearance)  
   - Thickness(measure at multiple points, deviation ≤0.005mm)  

3. Edge Inspection 
   - Use a magnifying glass (10×) to check for uniformity and defects.  
   - Confirm the edge chamfer meets requirements (typically 20-25° for stainless steel blades).  

II. Material & Hardness Testing
1. Material Verification  
   - Cross-check supplier material reports (common materials: SKD-11, DC53, high-speed steel, etc.).  
   - Conduct spectroscopic analysis if necessary (to rule out substandard substitutions).  

2. Hardness Test 
   - Use a Rockwell hardness tester (HRC), standard for stainless steel blades: **HRC 58-62**.  
   - Sample 3-5 blades per batch, hardness fluctuation ≤±1 HRC.  

III. Dynamic Balance & Radial Runout Test  
1. Dynamic Balance Test** (for high-speed slitting machines)  
   - Test on a dynamic balancer, residual unbalance ≤1.0g·mm/kg.  

2. Radial Runout Check  
   - Mount the blade on a mandrel and measure with a dial indicator:  
     - Standard precision: ≤0.02mm  
     - High precision: ≤0.01mm  

IV. Coating Quality Check (If Applicable)  
1. Coating Type Verification (TiN, TiAlN, DLC, etc.)  
2. Coating Thickness Measurement (use a coating thickness gauge, typically 2-5μm)  
3. Adhesion Test(cross-cut or Rockwell indentation method, no peeling is acceptable)  

V. Warehousing Management  
1. Categorized Storage  
   - Store by material, specifications, and coating type to avoid mixing.  
   - Storage conditions: temperature-controlled (20±5°C), low humidity (RH≤60%), anti-rust treatment.  

2. Records & Labeling 
   - Complete the "Tool Inspection & Receiving Form", documenting test data.  
   - Attach a qualified label with inspection date and inspector’s name.  

3. Sampling Rules  
   - New supplier: 100% full inspection  
   - Approved supplier: 10% batch sampling (minimum 5 blades)  

VI. Handling Non-Conforming Blades**  
| Issue | Action |  
|----------|------------|  
| Dimensional deviation | Return or rework |  
| Insufficient hardness | Reject entire batch |  
| Edge defects | Scrap individual pieces |  
| Coating peeling | Return for recoating |  

Notes:  
- For first-time-use blades, conduct a trial cut (500m of stainless steel strip) to check burrs and wear.  
- Precision slitting blades should be individually packaged to prevent transport damage.  

By following this standardized inspection process, blade quality can be ensured, minimizing downtime due to tool-related issues.