外文翻译-可重构机床.doc

1、毕 业 设 计（论 文）外 文 参 考 资 料 及 译 文译文题目： Reconfigurable Machine Tools 可重构机床 学生姓名： 学 号： 专 业： 所在学院： 指导教师： 职 称： 20xx年 2月 27日Reconfigurable Machine Tools R.G. Landers, B.K. Min, and Y. KorenUniversity of Missouri Rolla, Department of Mechanical Engineering, Rolla, Missouri University of Michigan, Department o

2、f Mechanical Engineering, Ann Arbor, MichiganAbstract The uniqueness of Reconfigurable Manufacturing Systems (RMSs) is that the structure of the system as well as of its machines and controls can be rapidly changed in response to market changes (demand and products). A major component of RMSs is the

3、 reconfigurable machine tool (RMT). By contrast to conventional CNCs that are generalpurpose machines, RMTs are designed for a specific, customized range of operation requirements and may be costeffectively converted when the requirements change. In this paper, systematic design tools that have been

4、 recently developed for RMTs are reviewed, and three examples are provided to compare RMTs to traditional types of machine tools. Keywords: Machine Tool, Machine Tool Module, Conversion 1 INTRODUCTION Traditionally, Dedicated Manufacturing Systems (DMSs) have been designed to produce a specific part

5、. These systems are economical when the production volumes are high and the part is produced over a long period of time. Conversely, Flexible Manufacturing Systems (FMSs) are designed to accommodate a large variety of parts even though the parts are not specified at the system design stage. For an o

6、verview of FMSs, see 1. These systems are economical when the production volumes are low, and a large variety of parts are produced. Rapidly changing market demands have made traditional DMSs economically infeasible for many applications and have driven the use of FMSs. However, FMSs do not provide

7、the robustness of DMSs and often have wasted resources making them uneconomical in many production situations 2. For many applications it is believed Reconfigurable Manufacturing Systems (RMSs) that combine the advantages of DMS and FMS will provide an economical solution 3. These systems are design

8、ed to accommodate a specific range of production requirements (i.e., product mix and volumes). Further, RMSs are characterized by customized flexibility, such that they are tailored to the current production requirements, but may be economically converted to a new set of production requirements. Thu

9、s, these systems are economical and robust since they are customized to the production requirements, their resources are minimized, and flexibility in their design allows for costeffective conversion when new production requirements arise. Indeed, reconfigurable manufacturing has been identified as

10、one of the six grand challenges for competitive manufacturing in 2020 4. As production requirements for a machining system change, so will the operation requirements (i.e., features to be machined and cycle times) for an individual station. Major components that make RMSs feasible are reconfigurable

11、 machine tools (RMTs). These machine tools are costeffective because they are customdesigned for a given range of operation requirements, and can be economically converted to meet new requirements. A conceptual design of an RMT based on the patent of Koren and Kota 5 is shown in Figure 1. As the par

12、t size and features change, the spindles can be relocated to perform the same operation in a different location or replaced with another spindle to perform a different operation. Spindles can also be added or deleted such that the resources are optimized. Figure 1: Conceptual RMT 5. A common type of

13、 machine tool in large manufacturing industries today is the dedicated machine tool (DMT). This type of machine tool is customdesigned for specific operation requirements and, therefore, its resources are minimized and, in turn, the machine cost is low and its performance is robust. The drawback of

14、DMTs is that they cannot be costeffectively converted when parts change. To address this challenge, flexible CNC machine tools have been developed and adopted in many industries. By contrast to DMTs that are designed around a specific part and therefore are inexpensive, CNCs are designed before the

15、operation requirements are known and, thus, they often have wasted resources that make customers pay for features they do not need. Further, these machines may not be able to handle the new operation demands (e.g., spindle power, geometric accuracy). The challenge, therefore, is to adopt the DMT approach and design a machine around a part family or a set of parts (rather than a specific part, so conversion by rapid reconfiguration of the machine is possible) and use CNC technology to drive the machine. Th