Resources can require a setup time to change the configuration between different setups/configurations. This models the time required for cleaning, installation of new tooling, re-calibration, feeding new raw materials, etc between the production of various families of products.
Such changeovers can take an considerable amount of time, and thus have an important impact on the production plan. The production planner will need to group production orders together in batches such to find a balance between reducing the changeover time and extra inventory caused by such grouping.
This example models a simple painting shop. Products can be painted on 3 equivalent painting lines. When a painting line changes color a setup time is required to clean the machines.
A number of data fields are required for this model:
Resource table refers to its setup matrix.
Operation-resource table defines the setup an operation requires on the resource.
- The batchwindow field in the operation table defines the time window used by the solver algorithm to reduce changeovers. The solver algorithm will scan for opportunities to create batches within this time window before and after the requirement date.
The generated plan drastically changes as soon as a batching window is specified.
- Plan editor without setup optimizationThe changeovers between operations are shown as a black line. Only a part of the plan is visible in the screenshot.
Plan editor with setup optimization