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2 Journal of Achievements in Materials and Manufacturing Engineering

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A functional tolerance model: an approach to automate the inspection process

100%

Hunter R. , Guzman M. , Möller J. , Perez J.

tom Vol. 31, nr 2

662-670

Purpose: Purpose of this paper is the definition of a framework to describe the Technological Product Specifications (TPS) and the information associated with the geometric dimensioning and tolerancing to integrate the design concepts into a commercial inspection system. Design/methodology/approach: A functional tolerance model provides a complete framework to define the geometric dimensioning and tolerancing and its relationship with the part geometry and the inspection process. This framework establishes a connection between a computer aided design and computer aided inspection system throughout the exportation of the information associated to the dimensions and tolerance of the part into a commercial CAI system. Findings: They are mainly focused on the definition of a framework that describes the relationship between the entities of dimensions and tolerances with the geometry of the part. The information imported to a CAI system allows to develop the inspection process without the additional information provided by a physical drawing of the part. Research limitations/implications: They regard the limited access to commercial CAI system and to the lack of protocols of exchange of data associated to the tolerances of the part. Practical implications: They involve facilitation of the inspection process development. This implication allows realizing the inspection process reducing the time spent to define the geometry to inspect and the parameters that must be controlled. Originality/value: The main value of this research is the development of a unique framework to extract the information related to the geometric dimensioning and tolerances and the geometry of the part in a common model. This model provides a complete definition and representation of the entities, attributes and relationship of design and inspection system.

A knowledge-based system for selection of progressive die components

72%

Kumar S. , Singh R.

tom Vol. 20, nr 1-2

475-478

Purpose: The present paper describes a knowledge-based system (KBS) developed for selection of progressive die components to automate the design process of progressive dies in stamping industries. Design/methodology/approach: The production rule based KBS approach of Artificial Intelligence (AI) has been utilized for constructing the proposed system. The system has been structured into seven KBS modules. Modules are user interactive and designed to be loaded in to the prompt area of AutoCAD. Findings: The output of system modules includes the type and proper dimensions of progressive die components namely die block, die gauges (front spacer and back gauge), stripper, punches, punch plate, back plate, die-set and fasteners. The system has been designed in such a way that the expert advices imparted by its modules are automatically stored in different output data files. These data files can be further utilized for automatic modeling of die components and die assembly. Research limitations/implications: Altough the system is limited to the design of progressive dies only, yet it can be extended further for the design of other types of dies also. Practical implications: The proposed system is ready for use in sheet metal industries for quick selection of progressive die components. The system can be implemented on a PC having AutoCAD software and therefore its low cost of implementation makes it affordable by small and medium sized stamping industries. Originality/value: The proposed system is capable of accomplishing the time-consuming task of selection of progressive die components in a very short time period.