The number of molds, setup time for mold changes, mapping of molds and resources, and maintenance schedules significantly impact production planning. This allows the constraints on primary resources such as workers and molds to be reflected in the production plan.
-
-
Production Scheduler in Indonesia
Production planning and load planning are closely related and require verification based on quantities. It is important to compare production quantities,…
続きを見る
What this article covers
- Setting mold change time as the pre-setup time for primary resources results in internal setup, stopping the machine for 120 minutes.
- Setting mold change time as the pre-setup time for secondary resources results in external setup, allowing the machine to operate for 120 minutes.
- By setting workers as secondary resources and establishing effective conditions, constraints can be reflected in the plan.
- Adjust the number of workers with the calendar's resource quantity and change the constraints in the resource table to reflect planned work time.
- Even with available equipment, constraints from secondary resources can impose restrictions on the allocation order of production plans.
Setting Constraints for Molds: Internal and External Setup
By setting secondary resources in the manufacturing BOM and leaving the pre-setup tasks for primary and secondary resources as 0 or blank, no pre-setup time occurs, and only the constraint of the number of molds is expressed. Setting the mold change time as the pre-setup time for the primary resource results in internal setup. For example, setting 120 minutes for the pre-setup task of the primary resource CUT and 0 for the secondary resource results in an internal setup time of 120 minutes, during which the machine stops.
Conversely, setting the mold change time as the pre-setup time for the secondary resource results in external setup. For example, leaving the pre-setup task for the primary resource blank and setting 120 minutes for the secondary resource allows the machine to continue operating during the 120-minute external setup time.
Adjusting Planned Work Time with Worker Constraints and Resource Quantity
Similar to molds, workers can also be considered as secondary resources and reflected as constraints on the primary resource's plan. In this case, a condition expression is set for the secondary resource's effective condition, indicating when workers can operate.
Assign workers as secondary resources to the primary resources used in process tasks (pre-setup tasks or manufacturing tasks). Adjust the number of workers with the calendar's resource quantity and reflect it in the planned work time by changing the resource quantity constraints in the resource table according to the resource quantity.
- Set secondary resources (workers) in the relevant process of the manufacturing BOM
- Set the resource constraints of workers in the resource table to infinite capacity
- Increase the resource quantity in the calendar table while checking the load status
Imposing Constraints on Allocation Order Despite Equipment Availability
Even when equipment is available, constraints from secondary resources such as molds and workers can impact production planning. By setting secondary resources, constraints can be imposed on the allocation order of the equipment's production plan. The production scheduler assigns work to available equipment to create a plan that completes as quickly as possible.
However, if there is a constraint such as "the next lot cannot start until the previous lot is completed," a serial production plan can be created by setting a common secondary resource for both lots' production processes.
Frequently Asked Questions | Production Planning Optimization FAQ
This section summarizes frequently asked questions in line with the content of this article.
What is the difference between internal and external setup for molds?
Internal setup involves setting the mold change time as the pre-setup time for the primary resource, stopping the machine. External setup involves setting the mold change time as the pre-setup time for the secondary resource, allowing the machine to continue operating.
How are worker constraints reflected in production planning?
By setting workers as secondary resources and establishing effective conditions, constraints are reflected in the plan. Adjust the number of workers with the calendar's resource quantity and change the constraints in the resource table according to the resource quantity.
Why do constraints affect production planning even when equipment is available?
Constraints from secondary resources impose restrictions on the allocation order of equipment. For example, setting a common secondary resource allows for the creation of a serial production plan.