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Kennametal makes the cut on composites

机译：肯纳金属减少复合材料

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摘要

Although possessing a very high strength-to-weight ratio, carbon-fiber-reinforced polymers (CFRPs) have unique structures that make them difficult to machine cleanly and precisely. And the quest for better performance from CFRPs has meant new materials being introduced to the composite makeup, expanding the challenges for manufacturers, cutting tool suppliers, and machine tool suppliers.rnWhile machining ductile materials such as steel or aluminum is based on shearing and consistent chip formation, machining composites is a more complex mechanism involving fracture of fibers by compression or bending forces, along with shearing and cracking of the matrix material. As cutting tools wear, the appearance of spalling (surface chipping), uncut fibers or resin (bending but not fracturing), and delamination at the surface or internal wall of the hole all occur at an increasing rate. This causes costly inspection and repair delays.
机译：碳纤维增强聚合物（CFRP）尽管具有很高的强度重量比，但其独特的结构使其难以清洁，精确地加工。对CFRP寻求更好性能的要求意味着将新材料引入复合材料化妆品中，从而扩大了制造商，切削工具供应商和机床供应商的挑战。加工复合材料是一种更为复杂的机制，涉及通过压缩或弯曲力使纤维断裂，以及基质材料的剪切和破裂。随着切割工具的磨损，剥落（表面碎裂），未切割的纤维或树脂（弯曲但不破裂）以及孔表面或内壁的分层都以增加的速度出现。这导致昂贵的检查和维修延迟。

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