DYNAMIC MAINTENANCE PLANNING APPARATUS

• US 20100312371A1
• Filed: 06/02/2010
• Published: 12/09/2010
• Est. Priority Date: 06/03/2009
• Status: Active Grant

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Attila, Lengyel, Nonaka, Yoichi, Suginishi, Yuuichi
• Granted Patent: US 8,442,666 B2
• Time in Patent Office: Days
• US Class Current: 700/101
• CPC Class Codes: G05B 19/41865 characterised by job scheduling, process planning, material flow
• CPC Class Codes: G05B 2219/32234 Maintenance planning
• CPC Class Codes: G05B 2219/45031 Manufacturing semiconductor wafers
• CPC Class Codes: Y02P 90/02 Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
• CPC Class Codes: Y02P 90/80 Management or planning

Abstract

A dynamic maintenance planning apparatus including a maintenance planning device and a priority calculating device is provided. The maintenance planning device determines a maintenance date and time on and at which the throughput of a manufacturing system is maximum from among possible maintenance dates and times based on a simulation result in which a specific manufacturing apparatus on a manufacturing system is stopped at a specified maintenance date and time, and, for the maintenance at the determined maintenance date and time, specifies a lot whose completion is predicted to be delayed. The priority calculating device calculates a priority of the lot whose completion is predicted to be delayed so as to prevent waiting time of the lot during the maintenance.

Claims

1. A dynamic maintenance planning apparatus on a manufacturing system where a manufacturing apparatus is shared among a plurality of processes and a plurality of products are manufactured, the dynamic maintenance planning apparatus comprising:

a maintenance plan generating unit that determines a maintenance date and time on and at which a throughput of a manufacturing system is maximum from among possible maintenance dates and times based on a result of a simulation in which the manufacturing apparatus that is specific on the manufacturing system is stopped at a specified maintenance date and time;

a completion-delayed-lot calculating unit that specifies a lot whose completion is predicted to be delayed due to maintenance on the determined maintenance date and time; and

a priority calculating unit that calculates a priority of the lot whose completion is predicted to be delayed so as to prevent waiting time of the lot during maintenance.

2. The dynamic maintenance planning apparatus according to claim 1, wherein

the simulation is performed at predetermined intervals or at a timing with an event occurrence as a trigger, and a result is stored in a storage medium.

3. The dynamic maintenance planning apparatus according to claim 1, wherein

the maintenance plan generating unit creates a plurality of candidates for change for a stop start date and a stop period within an adjustable range of a stop schedule of the manufacturing apparatus, calculates a decrease of the throughput of the manufacturing system for each of the plurality of candidates for change, and determines a maintenance date and time on and at which the throughput of the manufacturing system is maximum.

4. The dynamic maintenance planning apparatus according to claim 1, wherein

the completion-delayed-lot calculating unit creates a simulation model where the manufacturing apparatus as a target will stop as scheduled and a simulation model where the manufacturing apparatus as a target will not stop;

creates two progress plans for all lots based on each of the simulations during a specified period, and specifies a lot whose completion will be delayed when maintenance is performed based on a difference between times in a completion process of the progress plans.

5. The dynamic maintenance planning apparatus according to claim 1, wherein,

for lots whose completion will not be delayed due to a stop of the manufacturing apparatus, the priority calculating unit calculates a priority for each of the lots so that a lot having a smaller ratio between a remaining period until a shipping date and a remaining period until product completion is given a higher priority for being released in each manufacturing process.

6. The dynamic maintenance planning apparatus according to claim 1, wherein,

for lots whose completion will be delayed due to a stop of the manufacturing apparatus, the priority calculating unit calculates a priority for each of the lots so that a lot having a smaller ratio between a remaining time until the stop of the manufacturing apparatus causing a delay of completion and a remaining period until completion of a process of which the manufacturing apparatus that will stop is in charge is given a higher priority for being released in each manufacturing process.