1.What are the standards for "meeting the requirements"?
General requirements: Burr height ≤ 0.05mm (sometimes relaxed to 0.1mm). Suitable for general structural parts and internal components.
Higher requirements: Burr height ≤ 0.03mm or even ≤ 0.02mm. Used for automotive and home appliance exterior parts, precision parts requiring subsequent plating or direct assembly.
Extremely high requirements: Virtually burr-free (≤ 0.01mm), requiring subsequent deburring processes. Used for high-precision electronics, medical devices, etc.
2.Do slitting equipment and cutting tools affect the quality of slitting burrs?
Equipment Precision: High-precision slitting machines (such as those from German, Japanese, or high-end domestic brands) ensure minimal tool runout and stable tension control, which is fundamental for achieving good edges.
Tool Condition:
New Tool vs. Used Tool: Sharp new tools or freshly sharpened disc cutters produce minimal burrs (below 0.02mm). Worn tools generate numerous burrs and curled edges.
Tool Material and Design: Carbide (tungsten steel) tools are more wear-resistant, have a longer lifespan, and maintain sharpness better than high-speed steel tools. The cutting edge design also affects the cutting effect.
Tool Clearance and Overlap: These are critical process parameters. Excessive clearance causes the material to be "torn" rather than "cut," resulting in large burrs; insufficient clearance accelerates tool wear and can even lead to chipping.
3.How do the inherent properties of the material affect the quality of the slitting burrs?
Quality of cold-rolled coils: High-quality cold-rolled coils have uniform material and small thickness tolerances, which is beneficial for stable slitting.
Material hardness and strength: Softer materials (such as low-carbon steel) are easier to cut into smooth edges when slitting high-strength steel or silicon steel.
Surface coating: Cold-rolled coils with galvanized or oiled coatings affect the lubrication of cutting tools and chip removal, requiring corresponding adjustments to the process.
4.How do process parameters and operations affect the quality of slitting burrs?
Slitting speed: Excessive speed may lead to unstable cutting and burrs.
Tension control: Stable tension ensures the strip is flat and stable during cutting, with neat edges.
Rolling uniformity: Uneven winding will cause the strip to slide laterally, causing friction damage to the already cut edges.
5.How to control burrs to meet standards?
Select a qualified slitting supplier: Examine their equipment level, tooling management system, and past processed samples.
Clearly define technical requirements: Specify the "burr height standard" (e.g., burrs ≤ 0.05mm) in the order and provide inspection methods (e.g., using a burr measuring instrument or touch sensing).
Require first-piece inspection: Before batch slitting, cut a sample to check if the edge quality meets the requirements.
Proactive post-processing (if necessary):
For applications with extremely high requirements, a "deburring" process can be performed after slitting. Common methods include:
Mechanical scraping/grinding: Removing burrs online using tools or abrasive belts.
Electrolytic deburring: Suitable for complex shapes or high-hardness materials.
Magnetic abrasion/polishing: Obtaining smoother edges.