Anti-adhesion coated slitter blades

In stainless steel strip slitting operations, severe burrs on the cut edge are one of the most common quality complaints. Faced with burrs, many operators only know how to "adjust the gap," but overlook the decisive impact of edge parameters themselves on burrs. Mingbai Mechanical Tool Technology Co., Ltd., based on years of stainless steel slitting experience, provides you with a systematic edge parameter adjustment solution.   1. Root Cause Analysis of Burrs in Stainless Steel Strip   Stainless steel has three characteristics — high toughness, high work-hardening tendency, and low thermal conductivity — making its slitting burr problem much more complex than that of ordinary carbon steel.   Main pathways of burr formation:   · Edge dulling → increased shear force → material tears rather than cuts → burrs increase · Improper edge angle → excessive cutting resistance → lateral material flow → edge roll-over burrs · Insufficient edge surface finish → high friction coefficient → material adhesion to edge → uneven burrs     2. Adjusting the Edge Angle   1. Reduce the edge angle (wedge angle)   The smaller the edge angle, the sharper the blade and the lower the cutting resistance. Recommended angles for sharp slitter blades for stainless steel strip slitting:   · Conventional stainless steel (304, 316): Wedge angle 22°-25° · High-hardness stainless steel (430, martensitic): Wedge angle 25°-28° · Ultra-thin stainless steel strip (<0.3mm): Wedge angle 18°-20°   Adjustment principle: Choose the smallest edge angle possible while ensuring edge strength. For every 2° reduction in angle, cutting resistance can be reduced by 10%-15%.   2. Increase the clearance angle   The clearance angle affects the friction area between the blade and material. For high-hardness wear-resistant slitter blades in stainless steel slitting, recommended clearance angles:   · Conventional conditions: 8°-10° · High-speed slitting (>100m/min): 10°-12° · High-adhesion stainless steel grades: 12°-15°     3. Edge micro-passivation   A sharp edge cuts easily but has a high risk of micro-chipping. High-speed steel circular slitting blade are recommended to be micro-passivated:   · Edge radius R=0.005-0.010mm (extremely sharp, suitable for thin strips) · Edge radius R=0.010-0.015mm (micro-passivated, suitable for conventional stainless steel) · Edge radius R=0.015-0.020mm (moderately passivated, suitable for thick strips or high-speed slitting)   3. Optimizing Edge Surface Finish   Edge surface finish is one of the key factors in controlling burrs.   Recommended standards:   · Edge surface roughness Ra ≤ 0.1μm (mirror grade) · Rake face (chip contact surface) Ra ≤ 0.2μm · Flank face (material contact surface) Ra ≤ 0.1μm   High-finish stainless steel slitting blades can effectively reduce material adhesion and lower burr height by 30%-50%.     4. Coordinated Adjustment of Side Gap and Edge Parameters   After adjusting edge parameters, the side gap should also be adjusted accordingly:   · Sharp edge + small gap (5%-7% of material thickness): suitable for precision slitting of thin strips · Micro-passivated edge + medium gap (7%-9% of material thickness): suitable for conventional stainless steel · Passivated edge + large gap (9%-12% of material thickness): suitable for thick strips or high-speed slitting   5. Auxiliary Improvement of Burrs Through Coating   Appropriate coatings can reduce friction and adhesion, indirectly improving burrs:   · TiAlN coating: Suitable for high-speed slitting, heat-resistant up to 800°C · DLC coating: Suitable for high-adhesion stainless steel, friction coefficient as low as 0.1 · CrN coating: Suitable for corrosive environments, excellent anti-adhesion performance   For anti-adhesion coated slitter blades, it is recommended to pair with a mirror-finished edge for better results.     6. On-Site Adjustment Procedure   1. First, inspect the existing edge angle and surface finish. 2. Calculate the recommended edge angle based on the stainless steel grade and thickness. 3. Return to the factory or perform on-site regrinding to achieve the target angle. 4. Polish the edge to Ra ≤ 0.1μm. 5. Reset the side gap. 6. Conduct a trial cut and observe burr changes. 7. Fine-tune until burrs meet the standard.   7. Mingbai Technology's Stainless Steel Slitting Blade Solutions   Mingbai Mechanical Tool Technology Co., Ltd. offers dedicated blades for stainless steel strip slitting:   · Stainless steel slitting dedicated slitter blades: Edge angle customizable according to working conditions. · Mirror-grade edge polishing, Ra ≤ 0.05μm. · Optional TiAlN/DLC/CrN coatings. · On-site edge parameter inspection and adjustment services.     Conclusion   Severe burrs on the cut edge during stainless steel strip slitting are often not an equipment problem, but a problem with the edge parameters themselves. By optimizing the edge angle, clearance angle, passivation value, surface finish, and coordinating with coating and side gap adjustments, burr issues can be effectively controlled. Mingbai Technology is ready to help you solve burr problems with professional stainless steel slitting blade solutions.   FAQ Module   Q1: How long does a resharpened edge last in stainless steel strip slitting? A: It depends on the stainless steel grade and slitting length. For conventional 304 stainless steel, one resharpening typically lasts for 5,000–10,000 meters of continuous slitting. It is recommended to inspect the edge every shift and resharpen as soon as burrs increase noticeably.   Q2: Is a smaller edge angle always better? A: No. A smaller angle makes cutting easier, but reduces edge strength. Too small an angle leads to chipping and shorter life. For stainless steel slitting, we recommend 22°–25°, with fine-tuning based on material thickness and equipment rigidity.   Q3: Do different stainless steel grades require different edge parameters? A: Yes. For austenitic grades like 304/316, use 22°–24° edge angle and 8°–10° clearance angle. For ferritic grades like 430, use 25°–27° edge angle and 10°–12° clearance angle. For high-hardness martensitic grades, use 28°–30° edge angle with moderate passivation.   Q4: Is there a big difference in burr control between coated and uncoated blades? A: Yes, a significant difference. With the same edge parameters, TiAlN or DLC coatings can reduce burr height by 30%–50%, reduce adhesion, and produce more uniform burrs. Coated blades are highly recommended for stainless steel slitting.   Q5: Which affects burrs more — side gap or edge parameters?   A: Both are equally important. Edge parameters determine cutting ability, while side gap determines the degree of tearing. The correct approach is to first optimize edge parameters, then fine-tune the side gap based on trial cut results. The two work together to achieve the best cut edge quality. Website: www.mingbaiblade.com