Laser measurement of dimensional change sin powder metallurgy manufacturing processes

粉末冶金制造过程中尺寸变化的激光测量

• 批准号: 406593-2011
• 负责人: Doman, DarrelAnthony
• 金额: $ 6.58万
• 依托单位: Dalhousie University
• 依托单位国家: 加拿大
• 项目类别: Research Tools and Instruments - Category 1 (<$150,000)
• 财政年份: 2010
• 资助国家: 加拿大
• 起止时间: 2010-01-01 至 2011-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=472513
• 关键词: Laser; measurement; dimensional; change; sin

Near-net-shape processes are alternative methods of manufacturing products which provide minimal raw material wastage and little need for secondary machining or finishing. Powder metallurgy (PM) technologies are some of the most popular near-net-shape processes, where powdered metals are pressed into complex product geometries. Using the popular 'press-and-sinter' production process, powdered metal is pressed (compacted) in a die to the desired shape. These 'green compacts' are then heated in a controlled environment (sintered). Sintering sets the part microstructure and heavily influences its mechanical properties. However, after each of these processes the part often exhibits dimensional changes which, given the primary attractiveness of PM technologies, greatly lowers part quality. Two principal dimensional changes are springback and warping. After compaction, the part slightly enlarges as the powder relaxes, which is known as springback, and after sintering the part often warps or distorts considerably.

近净成形工艺是制造产品的替代方法，它可以最大限度地减少原材料浪费，并且几乎不需要二次加工或精加工。粉末冶金 (PM) 技术是最流行的近净成形工艺之一，其中粉末金属被压制成复杂的产品几何形状。使用流行的“压制和烧结”生产工艺，将粉末金属在模具中压制（压实）成所需的形状。然后将这些“生坯”在受控环境中加热（烧结）。烧结决定零件的微观结构并严重影响其机械性能。然而，在每一个过程之后，零件通常会出现尺寸变化，考虑到 PM 技术的主要吸引力，这会大大降低零件质量。两个主要的尺寸变化是回弹和翘曲。压实后，随着粉末松弛，零件会稍微扩大，这称为回弹，并且在烧结后，零件通常会相当大地翘曲或扭曲。