Objects of the value stream toolbox > Process objects

Contents

1. Brief description

The object Rework represents a special process and has its own connection type. Products that are marked as defective are reworked here.

2. Procedure and control description

The incoming, defective product will be repaired on this station. The necessary repair time is distributed equally between the minimum rework time and the maximum rework time.

Overview of reworking and possible constellations

Rework Process Overview

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Figure 1 - Rework Process Overview

Internal Rework – Within Process

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Figure 2 - Internal Rework – Within Process

Time line for part with rework within a station

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Figure 3 - Time line for part with rework within a station

External Rework – Downstream Part Flow

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Figure 4 - External Rework – Downstream Part Flow

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Figure 5 - External Rework – Downstream Part Flow

External Rework – Upstream Part Flow

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Figure 6 - External Rework – Upstream Part Flow

Multiple Rework constellations

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Figure 7 - Multiple Rework constellations

Material flow in rework constellation

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Figure 8 - Material flow in rework constellation

3. Parametrization

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Figure 9 - Process (Rework)

Process Parameter	Required	Description
Name	no	Name of the object
Products	no	Products of the object
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
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
min. Reworking time	yes	Minimum rework time of a product
max. Reworking time	yes	Maximum rework time of a product

4. Connection types

See chapter Possible connections to objects.