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Basic Modeling and Constraint

Advanced Modeling and Constraint

Scheduling Rules

Scheduling System Integration




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FLEXSCHE - production scheduler and production planning > Products > Basic Modeling and Constraint

Basic Modeling and Constraint

FLEXCHE provides various functions and constraints for modeling diverse manufacturing processes. The basics are as follows.

Structure of Operation

Manufacturing Part Setup / Teardown Part

One operation uses one primary resource (machine, facility, operation site, and such) and some subsidiary resources as needed (mold, operator, tool, electricity, and such). Each operation is comprised of maximum of three parts: setup, manufacture and teardown. The manufacturing part's time changes depending on the capacities of the resources and manufacturing quantities. The setup and teardown parts can be fixed periods of time, or times determined by the relationship with the operation immediately before and after (for example, washing time is short when the operation involves applying coats of paint similar in color, and a lengthy amount of time is needed when the colors are quite different).

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Network of Operation

Visualize Operation Network

A finished product required by order is made via several operations. The process merging and divergence can be freely defined and the linking of operations can be expressed generally through a network. The quantity of intermediate items and raw materials needed to create the necessary volume of finished products is calculated based on the ratio defined in the master data.

This structure can also be visually edited using the FLEXSCHE Editor.

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Time Constraints Between Processes

Time Constraints Between Processes

Time constraints are set between two processes.
When the overall process involves delivering items to the downstream process after they are all made in the upstream process, the time between the end of the upstream process and the start of the downstream process are constrained(ES). When items completed in the upstream process are immediately delivered to the downstream process without waiting for all of the items to be done as in flow operations, the time relationship between the start points and the end points are constrained(SSEE).

Minimum intervals between processes are set when there is a need for due times between processes and stand-by time for drying. Conversely, a ceiling is set for the time between processes when there is a need to introduce an item in a downstream process before it cools or decays, and scheduling is arranged based on compliance with these.
Times constraints can be set in detail using the Transfer Time Table(TTT) when there are different time constraints depending on physical distances between resources.

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Calendar Editing Dialog Calendar

This defines the time ranges during which operations can use the respective resources. The calendar can be used to define the usable time ranges by day and by resource with only a simple entry. Extended overtime and temporary stoppages for maintenance and the like are expressed with a free calendar. The resource Gantt chart can be used to easily add and delete information and usable time ranges can be moved, expanded and constricted by using the mouse. Changes in the number of operators, capacity and other data that differ depending on the time range (resource quantity) can also be defined in the calendar/free calendar.

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Scheduling with Awareness of Inventory

Scheduling Screen

FLEXSCHE can perform various scheduling based on theoretical inventory. Transition in the logical inventory volume can be confirmed on the Inventory Chart.

Inventory constrains for raw materials

When the inventory of a raw material is inadequate at the time a certain operation is started, the operation is started after a sufficient quantity of the material has arrived.

Replenishment production

An internal order is automatically placed to collectively cover supplies by designated quantity units and time periods so that items do not fall below predetermined safety inventory volumes. Scheduling is put in place to see that inventory volume does not fall below the safety level due to consumption of intermediate products.

Designate the inventory pegging

It is possible to designate by order the volume of in-progress intermediate inventories to be pegged to in-progress processes.

Inventory Data

It is possible to assign inventory, arrival amounts and shipped amounts for each item from outside parties.

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Operation Result

Operation Result Screen

It is rare that operations are performed perfectly, even when operational instructions are sent to the manufacturing site based on scheduling results. The plan and the operation site are synchronized by entering the operation results at the site and reflecting it in the next scheduling.
Detailed result information can be collected, such as operation progress, result collection time and the actual resources used. However, this can be reflected with a certain degree of precision even if detailed result information is not returned by the operation site. It is also possible for the manufacturing site to split operations or withdraw operations that were split in the plan.

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