Product Design Advisor by use of Producibility Evaluation based on Product and Manufacturing Resource Models

本研究的目的是利用基于产品和制造资源模型的可制造性评价来实现产品设计改进的建议系统。通过使用该系统，产品设计人员能够预测其产品可能存在的生产困难，并向其咨询如何在保持产品功能的同时提高可制造性。要实现上述目标是相当困难的，这里我们仅限于对可加工性评价的研究，而不考虑其他制造方法或工艺。我们首先扩展了我们以前在产品建模方面的工作，以便除了能够呈现产品形状、公差、材料、表面粗糙度和属性、加工形状特征等之外，还能够利用这些模型属性来处理产品、其毛坯材料和制造资源…更多的资源，如机床。我们将这些模型与切割过程模型相结合，能够非常精确地预测切削力和扭矩。通过对切削过程的仿真，可以准确地预测颤振的稳定边界，并自动设定合适的切削条件。我们将这些结果应用于复杂口袋采矿的数控刀具轨迹的生成。将上述结果与我们自己的工艺规划系统相结合，为正在设计的产品自动生成有针对性的工艺方案。生成的工艺计划通过从过去的加工经验和产品性能要求中提取的各种规则进行评估。评价结果为产品设计者根据可制造性改进设计提供了非常有用的建议。研究结果以软件工具的形式进行了总结，这些工具对于构建特定加工操作的建议系统是有用的。较少

The aim of this research is to realize an advising system for product design enhancement by use of producibility evaluation based on product and manufacturing resource models. By using this system, product designers are able to predict the possible difficulty of production about his products, and ask for advises how to improve the manufacturability while keeping the functionality of products. It is fairly difficult to achieve the above-stated target, and here we restrict our research on machinability evaluation only, and do not consider the other manufacturing methods or processes. However, the underlying approach and methods would be equally effective for other types of production.We first extend our previous work on product modelling in order to be able to present, in addition to product shape, tolerances, materials, surface roughness and property, machining form features, etc., and utilize those model attributes for dealing with products, their blank materials, and manufacturing res … More ources, such as machine tools. We combine these models with cutting process models to be able to predict cutting forces and torques very precisely. By this cutting process simulation, we can predict the stability boundary of chatter vibration correctly, and set up the appropriate cutting conditions automatically. We apply these results to the generation of numerically controlled cutter paths for complicated pocket mining. By this approach, the efficiency of NC pocket milling could be substantially enhanced.We combine the above-stated results with our own process planning system to automatically generate pertinent process plans for products being designed. The generated process plans are evaluated by various rules extracted from past machining experiences and product property requirements. The result of the evaluation is a very useful advice for product designers to improve their design according to the manufacturability. The result of the research is summarized in a form of software tools which are useful for constructing advising systems for specific machining operations. Less