1.Why are special cutting tools needed?
Protecting the Coating and Preventing Edge Peeling
Problem: When cutting with ordinary sharp knives, the immense pressure can cause the coating to separate from the substrate, leading to cracking and peeling of the paint or PVC layer at the cut edge, affecting aesthetics and corrosion resistance.
Solution: Special knives have optimized cutting edges with more suitable angles and shapes, primarily using a "compression cut" to reduce impact on the coating.
Achieving Smooth and Flat Cuts
Problem: Ordinary knives are prone to producing burrs, curling edges, or causing the coating to melt and stick at the cut (due to frictional heat).
Solution: Special knives (especially cross-cutting flying shears or roller shears) have extremely high hardness and smoothness, with very precise cutting edges, enabling clean and crisp cuts with smooth, burr-free edges.
2.What are the main types of cutting tools and their special requirements?
Slitting (V-cutting) Blades:
Disc Blades: Require higher hardness and wear resistance. The overlap and gap between the upper and lower blades are set more precisely than when shearing ordinary metal sheets to ensure the coating is cleanly cut rather than torn.
Typically made of hard alloy materials such as tungsten carbide, with a wear-resistant coating.
Cross-cutting Blades:
Flying Shears or Guillotine Shears: This is the most demanding part. The blades must be extremely sharp and durable to achieve an instantaneous clean cut at high speeds.
The blade angle, material, and heat treatment process are all critical. High-grade alloy tool steels (such as Cr12MoV, SKD-11, etc.) are commonly used and undergo special heat treatment and precision grinding.
3.What are the differences in the cutting edge design between knives for ordinary sheet metal and knives for color-coated sheet metal?
Cutting tools for ordinary sheet metal are primarily designed for wear resistance and impact resistance.
Specialized cutting tools for color-coated steel sheets feature more precise angles to reduce coating chipping.
4.What are the differences in surface treatment between knives for ordinary sheet metal and knives for color-coated sheet metal?
Cutting tools for ordinary sheet metal may be uncoated or have only basic treatment. Cutting tools specifically designed for color-coated sheet metal often feature a friction-reducing and wear-resistant coating.
5.What are the advantages of equipping color-coated coil leveling equipment with dedicated, high-quality cutting tools?
Ensure product cut quality to meet the requirements of high-end customers.
Reduce scrap rate and rework.
Extend tool life and reduce downtime for tool changes and sharpening.
Prevent coating adhesion to tools, maintaining stable and clean production.