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In mold manufacturing, automotive parts, and aerospace fields, the application of hardened steel (hardness ≥ HRC50) and high-hardness materials is becoming increasingly widespread. Traditional cutting tools often experience rapid wear, chipping, and even breakage when dealing with such materials. However, specially designed high-hardness milling inserts, through systematic optimization of the matrix, coating, and geometry, provide a reliable solution for hard machining.
Core Advantages: Why High-Hardness Milling Inserts Are Irreplaceable
Compared to ordinary carbide inserts, high-hardness milling inserts achieve a qualitative leap in the following dimensions:
1. Substrate and Coating: A Balance of Hardness and Toughness
High-hardness end mills utilize an ultra-fine or submicron grain cemented carbide substrate, with cobalt content typically controlled below 10% and grain diameter less than 0.7mm, ensuring both high hardness and toughness. Regarding coatings, the mainstream approach has upgraded from traditional TiAlN to high-aluminum (Al-Rich) coating technology. Taking the Mitsubishi MV1000 series as an example, its high-aluminum (Al,Ti)N coating not only significantly improves film hardness but also substantially enhances oxidation resistance, exhibiting excellent performance in high-temperature cutting. Other products employing hard coatings such as Duro-Si further enhance resistance to mechanical and thermal loads through special treatment of the cutting edge.
2. Cutting Edge Design: Geometric Parameters Optimized for Hard Cutting
The rake angle, clearance angle, and wedge angle of high-hardness end mills are specifically designed to adapt to the stress characteristics of hard cutting. Some ball end mills employ a double-edged structure with a smooth, seamless main cutting edge, ensuring micron-level machining accuracy. Some products also significantly enhance tool rigidity and suppress vibration through unequal cutting edge division, high helix angle combinations, and incremental core diameter designs. Furthermore, high-precision radius tolerances (e.g., 0/+0.015mm) and H4-grade toolholder accuracy requirements guarantee the demanding dimensional stability required in hard milling.
3. Significantly Improved Service Life and Machining Efficiency
Thanks to coating and cutting edge optimization, high-hardness end mills can extend tool life by 3 to 4 times compared to traditional coated tools when machining extremely hard materials with HRC>60. Simultaneously, they allow for higher cutting speeds and feed rates, which, combined with High Dynamic Milling (HDC) strategies, can significantly reduce machining time.
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Contact us:Company name:Kunshan Meiyaxing Hardware Machinery Co., Ltd;Tel:8618962438699;Address: Room 3003, Building 3, Zhengtailong, No. 1288 Chengbei Middle Road, Kunshan City, Jiangsu Province, China;Email:myxcuttingtools@gmail.com;Website: https://www.myxcuttingtools.com
