Machining of metal matrix composites and attainable surface integrity

金属基复合材料的加工和可达到的表面完整性

• 批准号: 238681-2010
• 负责人: Kishawy, Hossam
• 金额: $ 2.33万
• 依托单位: University of Ontario Institute of Technology
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2014
• 资助国家: 加拿大
• 起止时间: 2014-01-01 至 2015-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=547062
• 关键词: Machining; metal; matrix; composites; attainable

During the past decades, Metal Matrix Composites (MMC) have received considerable interest in several manufacturing sectors including automotive and aerospace industries which represent a major sector of the Canadian economy. MMC possess superior physical and mechanical properties compared to nonreinforced alloys. Therefore they are being considered as a replacement material for the conventional alloys in many engineering applications. Their unique physical properties gave them a great potential, however, MMC faces challenges in order to have a wide spread MMCs substitution for monolithic materials. The presence of abrasive reinforcements in the ductile matrix causes severe tool wear and premature tool failure during machining operation. Although efforts have been made to produce MMCs by casting, or hot forging, the resulted near net-shape products still have to be machined into the designed shape and dimension. Cracking and debonding of the reinforcement particles are the significant damage modes of machined surface also, subsurface damage assessment is critical for machined components subjected to fatigue, especially in critical application such as aerospace. The changes in the machined surface physical properties and machining induced residual stresses are attributed to both mechanical as well as thermal load (heat generated). One way to overcome this challenge is by reducing/eliminating the harmful effect of tool wear. The previous successful work of machining other difficult to cut materials with self propelled rotary tools has made it a good candidate for better control of tool wear and tool life when cutting MMC.

在过去的几十年中，金属基质复合材料（MMC）在包括汽车和航空航天行业在内的多个制造业中引起了极大的兴趣，这些行业代表了加拿大经济的主要部门。 与非增强合金相比，MMC具有优越的物理和机械性能。 因此，它们被视为许多工程应用中常规合金的替代材料。它们独特的物理特性赋予了他们巨大的潜力，但是，MMC面临挑战，以便将MMC替换为单片材料。 延性基质中的磨料增强件的存在会导致严重的工具磨损和加工操作期间的过早工具故障。 尽管已经努力通过铸造或热锻造来生产MMC，但所产生的近乎净形成产品仍必须加工到设计的形状和尺寸中。 加固颗粒的破裂和剥离是加工表面的显着损伤模式，地下损伤评估对于疲劳的机加工组件至关重要，尤其是在诸如航空航天等关键应用中。机械表面物理特性和加工引起的残余应力的变化归因于机械和热负荷（产生热量）。 克服这一挑战的一种方法是减少/消除工具磨损的有害效果。 以前的成功工作是用自我推进的旋转工具加工其他难以切割材料的工作，使其成为更好地控制工具磨损和工具寿命时的良好候选者。