Production plan apparatus

A production planning method comprising:

• storing, in a storage device, a takeoff request to manufacture a preset quantity of a product corresponding to a plurality of preset items at a target step in production lines by a delivery deadline, throughput of each production line constituting at least the target step, and basic information of a production plan for each production line,
• setting, at a processor, a plurality of takeoff objectives having different priorities based on the takeoff request stored in the storage device, the throughput of each of the production lines, and the basic information of the production plan for each manufacturing line;
• obtaining, at the processor, production plan data satisfying the plurality of set takeoff objectives;
• obtaining, at the processor, takeoff objective delay data indicating that the production plan data is delayed with respect to the plurality of takeoff objectives;
• and
• displaying, on a display device, at least a degree of delay of the product based on the production plan data and the takeoff objective delay data in accordance with each of the plurality of takeoff objectives in a preset display conformation,
• wherein the plurality of objectives include a first takeoff objective included in the plurality of takeoff objectives required to satisfy the takeoff request by the delivery deadline, a second takeoff objective obtained based on a restriction in throughput for each date and each of the items with respect to a step when manufacturing the product at a next step of the target step, and a third takeoff objective obtained by leveling the second takeoff objective in accordance with each of the dates, a highest priority being set to the first takeoff objective, a second highest priority being set to the second takeoff objective, and a lowest priority being set to the third takeoff objective,
• wherein the production plan data is obtained by digitizing each priority set to each of the items of the product and each of the priorities for each of the first to third takeoff objectives in accordance with a value of each priority, and carrying out optimization processing of minimizing a sum total of a product of a delayed quantity for each of the items of the product and the priority value of the delayed first to third takeoff objectives after digitization, the production plan data satisfying the first to third takeoff objectives set by the multiple-takeoff-objective setting section, and
• wherein, when said each priority of an item i in respective of the items of the product is Pi, and the production plan data T is calculated by said optimization processing by minimizing:
• item Σ(delayed days×quantity×Pi)×W1
• +item Σ(delayed days×quantity×Pi)×W2
• +item Σ(delayed days×quantity×Pi)×W3,
• where W1, W2 and W3 represent the first, second and third takeoff objectives.

A non-transitory computer readable storage medium storing a production plan processing program, wherein the program, when executed by a processor, causes the processor to perform a method comprising:

• setting a plurality of takeoff objectives having different priorities based on a takeoff request of manufacturing a preset quantity of a product corresponding to a plurality of preset items and taking off the product at a target step in manufacturing lines by a delivery deadline, throughput of each production line constituting at least the target step, and basic information of a production plan for each manufacturing line;
• obtaining production plan data satisfying the plurality of set takeoff objectives;
• obtaining takeoff objective delay data indicating that the production plan data is delayed with respect to the plurality of takeoff objectives;
• and
• displaying at least a degree of delay of the product based on the production plan data and the takeoff objective delay data in accordance with each of the plurality of takeoff objectives in a preset display conformation,
• wherein the plurality of takeoff objectives include a first takeoff objective as the plurality of takeoff objectives required to satisfy the takeoff request by the delivery deadline, a second takeoff objective obtained based on a restriction in throughput for each date and each of the items with respect to a step when manufacturing the product at a next step of the target step, and a third takeoff objective obtained by leveling the second takeoff objective in accordance with each of the dates, a highest priority being set to the first takeoff objective, a second highest priority being set to the second takeoff objective, and a lowest priority being set to the third takeoff objective,
• wherein the production plan data is obtained by digitizing each priority set to each of the items of the product and each of the priorities for each of the first to third takeoff objectives in accordance with a value of each priority, and carrying out optimization processing of minimizing a sum total of a product of a delayed quantity for each of the items of the product and the priority value of the delayed first to third takeoff objectives after digitization, the production plan data satisfying the first to third takeoff objectives set by the multiple-takeoff-objective setting section, and
• wherein, when said each priority of an item i in respective of the items of the product is Pi, and the production plan data T is calculated by said optimization processing by minimizing:
• item Σ(delayed days×quantity×Pi)×W1
• +item Σ(delayed days×quantity×Pi)×W2
• +item Σ(delayed days×quantity×Pi)×W3,
• where W1, W2 and W3 represent the first, second and third takeoff objectives.