【G197】磨床尾座体加工工艺及夹具设计.rar

Int J Adv Manuf Technol (2001) 18:784–789  2001 Springer-Verlag London Limited A Clamping Design Approach for Automated Fixture Design J. Cecil Virtual Enterprise Engineering Lab (VEEL), Industrial Engineering Department, New Mexico State University, Las Cruces, USA In this paper, an innovative clamping design approach is described in the context of computer-aided fixture design activi- ties. The clamping design approach involves identification of clamping surfaces and clamp points on a given workpiece. This approach can be applied in conjunction with a locator design approach to hold and support the workpiece during machining and to position the workpiece correctly with respect to the cutting tool. Detailed steps are given for automated clamp design. Geometric reasoning techniques are used to determine feasible clamp faces and positions. The required inputs include CAD model specifications, features identified on the finished workpiece, locator points and elements. Keywords: Clamping; Fixture design 1. Motivation and Objectives Fixture design is an important task, which is an integration link between design and manufacturing activities. The automation of fixture design activities and the development of computer-aided fixture design (CAFD) methodologies are key objectives to be addressed for the successful realisation of next generation manufacturing systems. In this paper, a clamp design approach is discussed, which facilitates automation in the context of an integrated fixture design methodology. Clamp design approaches have been the focus of several research efforts. The work of Chou [1] focused on the twin criteria of workpiece stability and total restraint requirement. The use of artificial intelligence (AI) approaches as well as expert system applications in fixture design has been widely reported [2,3]. Part geometry information from a CAD model has also been used to drive the fixture design task. Bidanda [4] described a rule-based expert system to identify the locating and clamping faces for rotational parts. The clamping mech- anism is used to perform both the locating and clamping Correspondence and offprint requests to: Dr J. Cecil, Virtual Enterprise Engineering Lab (VEEL), Industrial Engineering Department, New Mexico State University, Las Cruces, NM 88003, USA. E-mail: jcecilL50560nmsu.edu functions. Other researchers (e.g. DeVor et al. [5,6]) have analysed the cutting forces and built mechanistic models for drilling, and other metal cutting processes. Kang et al. [2] defined assembly constraints to model spatial relationships between modular fixture elements. Several researchers have employed modular fixturing principles to generate fixture designs [2,7–11]. Other fixture design efforts have been reported in [1,3,9,12–23]. An extensive review of fixture design related work can be found in [21,24]. In Section 2, the various steps in the overall approach to automate the clamping design task are outlined. Section 3 describes the dete