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Method of planning a production schedule and an apparatus for planning a production schedule

  • US 5,946,663 A
  • Filed: 11/27/1996
  • Issued: 08/31/1999
  • Est. Priority Date: 11/30/1995
  • Status: Expired due to Fees
First Claim
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1. A method of planning a production schedule comprising:

  • an operating data storing step of, in order to plan a production schedule in a processing factory, storing management data such as order information, stock information, and a production schedule, and basic data of said processing factory;

    a completed product stock allocating step of allocating order information to completed product stock information, and determining an order to be produced;

    a production schedule allocating step of integrating an order among orders to be produced, said order being included in a previous production schedule planned before an order change, into a new production schedule as a production-scheduled order;

    a production schedule deleting step of deleting a production schedule of said previous production schedule planned before an order change, this production schedule not including the orders to be produced;

    an operation request information preparing step of determining a production order from the orders to be produced, the production order being to be again subjected to planning of said new production schedule, said operation request information preparing step comprising;

    an operation developing step of preparing operation request information for determining a sequence of operations to be executed, from operation pattern information for producing a product for each production order, and obtaining said operation request information consisting of at least one operation pattern;

    an operation unit production quantity calculating step of allocating operation request information for each production order to an intermediate stock, and obtaining a quantity which is to be actually produced, for each operation;

    an operation unit charge quantity calculating step of obtaining a quantity to be charged, on the basis of non-defective product rate information of each operation; and

    a simulation processing step which comprises;

    a lot-size optimizing step of dividing an operation request or joining operation requests so that an optimum lot size is obtained in accordance with a kind of an operation; and

    a simulation step of conducting scheduling at the optimized lot size, and said simulation step having a scheduling rule set in order to dispatch a prepared operation request to a resource such as production equipment in a simulation system said, scheduling rule set havinga releasing rule which determines charge enabled dates and hours for the production orders;

    a filtering rule which preliminarily selects an operation;

    a routing rule which selects a resource such as equipment;

    a dispatching rule which dispatches a prepared operation request to a selected resource; and

    a postprocessing rule which, immediately after dispatching conducts a control on subsequent dispatching on the basis of information of the dispatching.

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