Objects of the value stream toolbox > Process objects

Contents

1. Brief description

In principle, a lead process behaves like a simple process. The difference is that a throughput time is defined in addition to an actual cycle time.

2. Procedure and control description

The information about the product to be processed arrives via a production order. A PPS, a subsequent supermarket or a Kanban object create production orders.

The process orders the basic products needed for the production order from a previous storage, supermarket or supplier.

Often processes are not only charged with production orders from only one production line, but also for production orders from other production lines.

Using the ForeignOrder object, these shared resources can be projected onto the respective process object.

Physically you can imagine this object as a continuous furnace, where the products need a certain time to come from the inlet to the furnace to the outlet from the furnace (cycle time).

But every x seconds parts come out of the furnace, where x is the actual cycle time. If the cycle time is equal to the actual cycle time, the object behaves like a simple process.

Furthermore, a distinction can be made as to whether the respective process contributes to increasing the value of the finished product or not.

20220718_process_lead

Figure 1 - Procedure and control description

3. Parametrization

20230217_object_process_lead_EN

Figure 2 - Process (Lead)

Process Parameter	Required	Description
Name	no	Name of the object
Products	no	Products of the object
Is value adding	no	Determining whether a process contributes to increasing the value of a product
Number of workers	yes	Number of assigned workers per process
Setup time	yes	Time required for an object to prepare for an upcoming product
Create setup matrix	no	Opens a new view to create a setup matrix
Availability	yes	Reliability (in %) with which an object operates without interference. Percentage only refers to the working time status (machine is not disturbed during unplanned, paused, waiting or setting-up)
MTTR	yes	Meantime to Repair: Time required to repair a malfunction
Exit strategy	yes	Logic according to which the products leave the object Available modes: •Cyclic (blocking) •Start at successor 1 (cyclic, non-blocking, each test with start at first successor; corresponds approximately to "overflow control") •First free successor (cyclic, non-blocking, start at last successor + 1) •Lowest occupancy (lowest relative capacitive occupancy; without paused and disturbed parts, weighted by time)
Shift calendar	no	Allocation of working hours and rest periods
Base products in storage for order start	no	Determining whether a base product is in storage for order start or not
Comment	no	Custom notes and annotations

Product Parameter	Required	Description
Product	yes	Product to be processed
Base product	yes	Product required to manufacture selected product
Required base products	yes	Number of basic products required
Lot size	yes	Quantity of products produced
Lead time	yes	Time between entry and exit of an object
Planned cycle time	no	Average planned cycle time per day
Cycle time	yes	Time interval between two products (independent of lot size)
Transfer quantity	yes	Required quantity of products before transfer (regardless of lot size)
Rework rate [%]	yes	Probability (in %) of marking products for rework. Selected products are processed at the first possible station Rework can be done in the station itself or at the next junction for rework (corresponding edge). A part is either scrap or rework at the end of a machining operation, i.e. a part that is to be reworked is not destroyed in the same station ([percentage good parts +] percentage scrap + percentage rework)
Scrap rate [%]	yes	Probability (in %) with which products are marked as unusable. Selected products are deleted immediately after processing A part is either scrap or rework at the end of a machining operation, i.e. a part to be destroyed is not reworked in the station ([percentage good parts +] percentage scrap + percentage rework)
Priority	no	Position of the order in the order list. The higher the priority, the earlier the order is processed.

4. Connection types

See chapter Possible connections to objects.