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Technical Paper

Application of Axiomatic Design Principles for Process Planning in Milling

This study shows how to apply the principles of Axiomatic Design to develop a system for cutting parameter selection for milling-one of the widely used material removal processes. The attention is given on the industrial practices during the rough cuts so that the machinist can determine the optimal table feed and tool's rotary speed ensuring high productivity and longer tool life. It is found that a significant amount of sequential coupling dominates cutting parameter selection process. A prototype system has been developed to see the effectiveness of proposed approach.
Technical Paper

Axiomatic Design of Hexapod-based Machine Tool Structures

Compared to the conventional serial structures of machine tools, hexapod-based structures are attracting increased attention because of their high rigidity and accuracy, less sliding surfaces, and light weight. There is no broadly accepted methodology by which one can determine the optimal structures of hexapodic parallel kinematic machines. This paper presents a systematic approach to design hexapod-based machine tools using axiomatic design. In the proposed formulation a set of function requirements (FRs) and a set of design parameters (DPs) are developed to study the coupling in the design. Modified FRs and DPs are suggested to reduce the coupling and thereby to design “good” hexapod based machine tools. Particular interests are given to those FRs-DPs mappings which are helpful in achieving an appropriate support for an arbitrary system of force and torque, as well as in getting a well-shaped workspace (i.e., maximizing the effective travels in all linear and angular directions).
Technical Paper

Minimizing Information Content of a Design using Compliance Analysis

This study shows that to minimize the information content at an early stage of a design process, three types of compliance are required, namely range, certainty, and requirement compliances. Range compliance measures the average belongingness of a numerical range to a vague linguistic class. Certainty compliance measures how clearly a piece of design information is known or given. Requirement compliance measures how strongly a design alternative fulfills the linguistically defined design requirement or range. To demonstrate the effectiveness of the method, a case study that deals with the selection of optimal materials for a car body is presented. A computing tool is also developed to practice the method using computers.