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Evaluation method of assembly sequences

  • US 5,523,960 A
  • Filed: 08/10/1994
  • Issued: 06/04/1996
  • Est. Priority Date: 08/10/1994
  • Status: Expired due to Term
First Claim
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1. An evaluation method of assembly sequences comprising steps of:

  • designing an assembly composed of a plurality of parts;

    preparing a component relation diagram (CRD) indicating a joint relation between said plurality of parts;

    reducing assembly sequences containing infeasible subassemblies by computing weights of all subassemblies in respective processes of an AND/OR tree structure of said assembly, said step of reducing assembly sequences containing infeasible subassemblies including steps of;

    categorizing said subassemblies into infeasible subassemblies if said subassemblies have respective weights greater than upper limit weights which can be handled by respective assembly tools; and

    deleting assembly sequences containing said infeasible subassemblies;

    evaluating feasible assembly sequences obtained from said CRD by the evaluation function
    
    
    space="preserve" listing-type="equation">E(q)=W.sub.h ·

    f(H(q))+W.sub.j ·

    f(J(q))+W.sub.i ·

    f(T(q)) where q is an assembly sequence, E(q) is an evaluation function, Wh, Wj and Wi are weighting factors for ease of part handling, ease of part joining, and tool changes criteria, respectively, f is a scaling function, H(q) is a sum of weights of all of said subassemblies for said assembly sequence q, J(q) is a number of joining direction changes for said assembly sequence q, and T(q) is a number of tool changes for said assembly sequence q; and

    performing assembly in said assembly sequence depending on a result of said step of evaluating feasible assembly sequences.

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