英语翻译Object-oriented technology may provide a powerful repres

英语翻译
Object-oriented technology may provide a powerful representation and classification tools for a virtual flexible manufacturing cell.It may also provide a common platform for the information sharing between sub-modules,and provide a richer way to store/retrieve/modify information,knowledge and models and reuse them.In the context of an object oriented approach,a model is simply an abstraction,or a representation of an objects or process.
VFMC requires a robust information infrastructure that comprises rich information models for products,processes and production systems.As shown in Fig.2,three models,that is product model,facility model,and process model,are developed for virtual flexible manufacturing cells.
A product model is a generic model used for representing all types of artifacts,which appear in the process of manufacturing.It represents target products,which include conceptual shape information as well as analysis module for a specification,productivity,and strength.A facility model contains information about machines consisted of a virtual flexible manufacturing cell.By using the model,innovative tooling and methods can be evaluated without the cost of physical machine prototypes and fixture mock-ups.A process model is used for representing all the physical processes that are required for representing product behavior and manufacturing processes.
3.1 Product model
A product model holds the process and product knowledge to ensure the correct fabrication of the product with sufficient quality.It acts as an information server to the other models in the VFMC.It also provides consistent and up-to-date information on the product lifecycle,user requirements,design,and process plan and bill of material.An instance of Class Part provides detailed information about a part to be fabricated in VFMC.Sub-classes like Process-Plan,BOM,and NcCode,are aggregated into the class Part.Classes Process-Plan and BOM manipulate information and data associated with process plans and bill of materials,respectively.Class NcCode deals with NC programs,which interacts with CAD/CAM systems.With incorporation with the facility model,this developed NC programs can be verified and checked for collisions and interference with any work-piece or tooling in the fixture.This can avoid costly machine crashes and reduce risk during initial equipment installation and produce launch.Furthermore,productivity can be improved by avoiding nonproductive time for program prove out on the machine tool and by using the simulation environment to train operators of new machines.

面向对象技术可以为虚拟柔性制造单元提供强大的表现和分类工具.它也可以提供一个和子模块信息共享的公共平台,并提供更丰富的方法来存储/检索/修改信息、知识和模式,并再利用.在面向对象的方法中,模型只是抽象的概念,或者是对象和过程的代表.
虚拟柔性制造单元需要一个强大的信息基础设施,即包括产品,工艺和生产系统在内的丰富的信息模型.如图2（译文略）所示,三种模型,即产品型号、设备模型和过程模型,都是开发虚拟柔性制造单元.
产品型号是在制造过程中出现的代表所有人工产品的通用模型.它代表的目标产品,包括概念形状信息以及规范、效率和实力的分析模块.设施模型包含了组成虚拟柔性制造单元的机器的信息.利用该模型,新型的工具和方法可以不需要计入实际原型机和夹具制成品的成本而直接进行评估的.过程模型是用来表示所有的物理过程,这些过程要求能代表产品的性能和制造的过程.
3.1产品型号
产品型号包含有工艺和产品的知识,以确保有高质量产品的正确加工方法.它在虚拟柔性制造单元的其他类型里扮演的是信息服务器的角色.它还一贯为产品生命周期,用户要求,设计和工艺方案、材料清单提供最新的信息.零件类的实体,提供在虚拟柔性制造单元中由有关的组块的详细信息,像加工计划、物料清单和数控代码的子分类,被统一归入到零件类别中.加工计划、物料清单类巧妙的处理与之相关的加工计划和物料清单的信息和数据；数控代码类则处理和CAD/CAM相互作用的数控程序.随着设备模型的合并,这些成熟的数控程序可以被核实和检查由于冲突和干涉.这将避免代价巨大的机器损坏,并减少初装设备和启动生产时的风险.此外,由于避免了机床在检测工艺程序过程中所耗费的非生产性时间,而且可以在模拟环境下培训工人使用新机器,生产率得到了提高.