Feed Drives for High-Accuracy, High-Speed Milling Machines

适用于高精度、高速铣床的进给驱动装置

• 批准号: 9908209
• 负责人: John Ziegert
• 金额: $ 32.91万
• 依托单位: University of Florida
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-09-01 至 2003-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9908209&HistoricalAwards=false
• 关键词: Feed; Drives; Accuracy; Speed; Milling

High speed milling (HSM) is recognized as one of the most significant recent innovations in machining. One of the main obstacles to further advancement of HSM is the challenge of designing feed drives capable of reaching the required high speeds and high accelerations while maintaining transient path following accuracy. This is due to the heavy masses to be moved, and the vibration modes of the structure that are excited by the motion. In order to fully utilize the current generation of high speed spindles, axis accelerations of 1g to 2g are required with speeds up to 1 meter per second. In order to achieve this level of performance, it is desirable to have positional servo bandwidths of 100 Hz or more. This project will focus on the feed drives and control strategies of high speed milling machines, to enable higher speeds and accelerations and also to enhance contouring accuracy during high speed motions. Using the high speed milling machines developed at the university, appropriate control strategies will be developed and verified for traditional ballscrew/rotary servomotor drives, direct linear servomotor drives, and hydrostatic leadscrew/rotary servomotor drives. This project is expected to significantly advance high speed machining technology. Practical implementation of this technology may include, for example, the production of aircraft, where structural parts with thin sections milled from solid blocks are replacing riveted sheet metal assemblies, and in the production of forging, die casting, and injection molding dies where high speed milling is replacing electrical discharge machining on a large scale.

高速铣削(HSM)被认为是近年来机械加工领域最重要的创新之一。HSM进一步发展的主要障碍之一是如何设计能够达到所需的高速度和高加速度，同时保持瞬时路径跟踪精度的进给驱动器。这是由于要移动的大质量，以及由运动激励的结构的振动模式。为了充分利用当前一代的高速主轴，需要1g到2g的轴向加速度，速度高达1米每秒。为了达到这种性能水平，希望具有100赫兹或更高的位置伺服带宽。该项目将专注于高速铣床的进给驱动和控制策略，以实现更高的速度和加速度，并在高速运动中提高轮廓精度。使用该大学开发的高速铣床，将开发和验证适用于传统滚珠丝杠/旋转伺服电机驱动、直接直线伺服电机驱动和液压静压丝杠/旋转伺服电机驱动的控制策略。该项目有望极大地推动高速加工技术的发展。例如，这项技术的实际实施可能包括飞机的生产，其中从实心块铣削的薄壁结构部件正在取代铆接的板材组件，以及在锻造、压铸和注塑模具的生产中，其中高速铣削正在大规模地取代电火花加工。