Advanced techniques of on-machine cutter/part measurement and supplementary machining of out-of-tolerance features for accurate and efficient machining of 3-D printed complex workpieces

机上刀具/零件测量和超差特征补充加工的先进技术，可实现 3D 打印复杂工件的精确高效加工

• 批准号: RGPIN-2020-06768
• 负责人: Chen, Zezhong
• 金额: $ 1.97万
• 依托单位: Concordia University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2020
• 资助国家: 加拿大
• 起止时间: 2020-01-01 至 2021-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=718465
• 关键词: Advanced; techniques; machine; cutter; part

Industry 4.0 includes intelligent manufacturing, and on-machine measurement is a kennel technology of intelligent manufacturing. In machining, tool size and wear are measured with a tool setter on a CNC machining center, and then the CNC controller automatically compensates the tool wear in the following machining; consequently, the worn tool cuts the part features without larger error. A machined feature is measured with a touch trigger probe on the machine after it is cut; and then if the feature is out-of-tolerance, supplementary machining is automatically carried out on the same machine. Therefore, on-machine measurement can increase machining accuracy and efficiency and reduce scraped parts. 3-D printed complex workpieces have to be machined to tolerance before use. Supplementary machining of out-of-tolerance part surfaces is crucial to 3-D printed workpiece machining. However, there are many problems with on-machine measurement and 3-D printed part machining. To address the problems, this research program is aimed at developing advanced key techniques. The research objectives include: to establish precise and completed models of measuring tools using laser and contact tool setters in terms of the tool setter structure, the CNC controller, the tool runout and geometry, the spindle speed and the tool feed rate, and then minimize the measuring time and maximize the measuring accuracy; to establish an accurate mechanistic model of measuring complex surfaces using touch trigger probe in terms of the probe structure, the CNC controller, the probe offset, the surface geometry and the probe feed rate, and then minimize the measuring time and maximize the measuring accuracy; and to propose an iterative approach to measuring points on the 3-D printed workpieces, automatically identifying and defining the out-of-tolerance regions and then generating CNC tool paths to machine these regions. This proposed research will contribute new scientific knowledge of on-machine tool and part measurement and lay a solid foundation for on-machine measurement research. It will substantially advance the techniques of on-machine measurement and 3-D printed complex part machining. This research will promote intelligent manufacturing and the additive manufacturing. It will train high qualified personnel and disseminate the new scientific knowledge. The techniques developed in this work will benefit the Canadian manufacturing industry through improving accuracy and efficiency of CNC machining; fortunately, the improvement is urgently needed to increase our industrial competitiveness in view of on-going globalization. This research is complementary to the past NSERC-sponsored projects of CNC machining and its results will be promptly applied to industrial production through our collaboration with Pratt & Whitney Canada, Bombardier, and some automobile companies.

工业4.0包括智能制造，机上测量是智能制造的狗窝技术。在加工中，使用CNC加工中心上的工具二阶测量工具尺寸和磨损，然后CNC控制器自动补偿以下机加工中的刀具磨损；因此，磨损的工具将零件特征剪切而没有更大的错误。 切割后用触摸触发探针测量了加工功能。然后，如果该功能不耐受，则将在同一台机器上自动进行补充加工。因此，机上测量可以提高加工精度和效率，并减少刮擦零件。使用前，必须将3-D打印的复杂工件加工成可容忍。 不耐受零件表面的补充加工对于3-D打印工件加工至关重要。但是，机上测量和3D印刷零件加工存在许多问题。 为了解决这些问题，该研究计划旨在开发高级关键技术。研究目标包括： 使用激光和联系工具设置器建立精确和完整的测量工具模型，以工具设置器结构，CNC控制器，工具跳动和几何形状，纺锤速度和工具馈电率，然后最小化测量时间并最大化测量精度； 为了建立一个使用触摸触发探针来测量复杂表面的精确机械模型，以探针结构，CNC控制器，探针偏移，表面几何形状和探针进料速率，然后最小化测量时间并最大程度地提高测量精度；和 提出一种迭代方法来测量3-D打印工件上的点，以自动识别和定义不耐受性区域，然后生成CNC工具路径来机械加工这些区域。 这项拟议的研究将为机器工具和部分测量提供新的科学知识，并为机上测量研究奠定了坚实的基础。 它将大大推动机上测量和3-D打印复杂部分加工的技术。 这项研究将促进智能制造和增材制造。它将训练高素质的人员并传播新的科学知识。 这项工作中开发的技术将通过提高CNC加工的准确性和效率来使加拿大制造业受益；幸运的是，鉴于正在进行的全球化，迫切需要改进我们的工业竞争力。 这项研究与过去由NSERC赞助的CNC加工项目互补，并通过与Pratt＆Whitney Canada，Bombardier和一些汽车公司的合作将其结果迅速应用于工业生产。