Production progress control method

Claim 1

A method for controlling priorities for the progress of production lots among those lots which are in progress, the method comprising the steps of: forming a standard working time table (a) in which a standard working time for each production step is given; providing, for each of said lots, a sequential production step table (b) in which a plurality of sequential production steps are given, each of said sequential production steps covering a period from a process starting time to a product due-in time; providing, for each of said lots, a process passage-time schedule table which includes a target process period (d) set as a target from said process starting time to said product due-in time, a logical process period (e) which sums up said standard working time for each production step, and a total of marginal time (f) which is calculated by subtracting said logical process period (e) from said target process period, said total of marginal time (f) being divided by the number of the production steps and the resulting divided marginal time being inserted between respective production steps to obtain a target passage time (cc); forming a delay time table (g) in which a delay time is given for each of the lots calculated from a difference between an actual passage time of a current lot in process and said target passage time (cc); providing a priority sequence table (i) in which priorities are given in sequence of delays amount the lots, based on said delay time table; and using said sequence of delays as a factor for priority determination in controlling the progress of the production lots.

Claim 2

A method for controlling priorities for the progress of production lots among those lots which are in progress, the method comprising the steps of: forming a standard working time table (a) in which a standard working time for each production step is given; providing, for each of said lots, a sequential production step table (b) in which a plurality of sequential production steps are given, each of said sequential production steps covering a period from a process starting time to a product due-in time; providing, for each of said lots, a process passage-time schedule table which includes a target process period (d) set as a target from said process starting time to said product due-in time, a logical process period (e) which sums up said standard working time for each production step, and a total of marginal time (f) which is calculated by subtracting said logical process period (e) from said target process period, said total of marginal time (f) being divided by the number of the production steps and the resulting divided marginal time being inserted between respective production steps to obtain a target passage time (cc); forming a delay time table (g) in which a delay time is given for each of the lots calculated from a difference between an actual passage time of a current lot in process and said target passage time (cc); providing a priority sequence table (i) in which priorities are given in sequence of delays amount the lots, based on said delay time table; and using said sequence of delays as a factor for priority determination in controlling the progress of the production lots.