Abstract
A mechanical assembly is a composition of interrelated parts. Assembly data base stores the geometric models of indi-vidual parts, the spatial positions and orientations of the parts in the assembly, and the relationships between parts. An assembly of parts can be represented by its liaison which has a description of its relationships between the various parts in the assembly. The problem is to not only make the information available but also use the relevant information for making decisions, especially determination of the assembly sequence plan. The method described in this paper ex-tracts the feature based assembly information from CAD models of products and build up liaisons to facilitate assembly planning applications. The system works on the assumption that the designer explicitly defines joints and mating condi-tions. Further, a computer representation of mechanical assemblies in the form of liaisons is necessary in order to automate the generation of assembly plans. A novel method of extracting the assembly information and representing them in the form of liaisons is presented in this paper.
Highlights
The deployment of product models for planning assembly processes has received significant attention over the years and considerable research is happening in the area of assembly planning over the years
The method described in this paper extracts the feature based assembly information from CAD models of products and build up liaisons to facilitate assembly planning applications
The output of the program gives the number of parts in the assembly, mating relationships that exist between various parts of the assembly and displays the liaison diagram or table showing the relations
Summary
The deployment of product models for planning assembly processes has received significant attention over the years and considerable research is happening in the area of assembly planning over the years. Relational models represent geometric relations in the form of mating features between individual parts or subassemblies called liaisons. Of late, these parts or subassemblies are being designed using CAD programs, the shape of each part and geometric information are already available in computer database. Since an effective description of assembly knowledge is very necessary, this information if extracted will be beneficial in identifying interdependencies between parts of the assembly and represent them in the form of a liaison diagram. A novel approach of using the Automatic Programmable Interface (API) of the CAD software to extract the information which is used to generate the liaison diagram which will be useful to generate assembly plans more efficiently. Building of a liaison diagram; Section 5 describes the system interface and the algorithm to extract relationships and generate liaisons; Section 6 gives an example of the approach and system and Section 7 gives concluding remarks
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