A katalok entry guide in a rolling mill is a critical component that ensures proper alignment and smooth entry of the workpiece (such as billets, blooms, or slabs) into the rolling stands. Below is a structured guide to understanding and maintaining the entry guide in a rolling mill:
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1. Purpose of an Entry Guide
– Ensures precise alignment of the workpiece before entering the roll gap.
– Prevents misalignment, cobbles, or material jamming.
– Reduces wear on rolls and guides.
– Improves product quality by minimizing edge defects.
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2. Types of Entry Guides
# a. Fixed Entry Guides
– Simple, non-adjustable design.
– Used for consistent cross-sections (e.g., square/round billets).
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# b. Adjustable Entry Guides
– Allow width adjustments for different material sizes.
– Common in section mills (e.g., I-beams, channels).
# c. Roller Entry Guides
– Use rotating rollers to reduce friction and surface scratches.
– Ideal for high-speed rolling.
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3. Key Components
| Component | Function |
|——————–|———-|
| Guide Frame | Holds the guide assembly in place. |
| Wear Liners/Plates | Replaceable surfaces to reduce wear. |
| Rollers (if used) | Minimize friction during entry. |
| Adjusting Mechanism | Allows width/height adjustments. |
| Lubrication System | Reduces friction and heat buildup. |
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4. Installation & Alignment Steps
1. Inspect the Guide: Check for wear, cracks, or misalignment.
2. Positioning: Align with the roll pass design (centerline must match).
3. Secure Fasteners: Tighten bolts to avoid vibration-induced misalignment.
4. Test Run: Pass a dummy workpiece to verify alignment before production.
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5. Common Issues & Solutions
| Problem | Cause | Solution |
|——————–|——-|———-|
| Material Jamming | Misaligned guide | Re-adjust to match roll pass centerline. |
| Excessive Wear | Lack of lubrication or hardened deposits | Replace liners; improve lubrication. |
| Surface Scratches | Rough/damaged rollers or guides | Polish/replace rollers; check alignment. |
| Vibration | Loose fasteners or worn components | Tighten bolts; inspect for wear. |
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