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: 2013
• 资助国家: 加拿大
• 起止时间: 2013-01-01 至 2014-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=524412
• 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.

在过去的几十年里，金属基复合材料 (MMC) 引起了多个制造业领域的极大兴趣，包括代表加拿大经济主要部门的汽车和航空航天工业。 与非强化合金相比，MMC 具有优异的物理和机械性能。 因此，它们被认为是许多工程应用中传统合金的替代材料。它们独特的物理特性赋予了它们巨大的潜力，然而，MMC 面临着广泛的 MMC 替代单片材料的挑战。 延展性基体中磨料增强材料的存在会导致加工操作过程中刀具严重磨损和刀具过早失效。 尽管人们已经努力通过铸造或热锻来生产MMC，但所得到的近净形产品仍然需要加工成设计的形状和尺寸。 增强颗粒的开裂和脱粘也是加工表面的重要损伤模式，表面下损伤评估对于遭受疲劳的加工部件至关重要，特别是在航空航天等关键应用中。加工表面物理性能和加工引起的残余应力的变化归因于机械负荷和热负荷（产生的热量）。 克服这一挑战的一种方法是减少/消除刀具磨损的有害影响。 之前使用自走式旋转刀具加工其他难切削材料的成功工作使其成为切削 MMC 时更好控制刀具磨损和刀具寿命的良好候选者。