Flexible Manufacturing Systems

Introduction to FMS/FAS

Conventional Manufacturing

Consisted of 2 varieties1. Job Shop type systems were capable

of large variety of product, but at a high cost.

2. Transfer lines could produce large volumes of a product at a reasonable cost, but were limited to the production of one, two, or very few different parts.

What is FMS/FAS? A FMS/FAS is one manufacturing

machine, or multiple machines that are integrated by an automated material handling system, whose operation is managed by a computerized control system. An FMS can be reconfigured by computer control to manufacture various products.

What is CIM? CIM is the integration of the total

manufacturing enterprise through the use of integrated systems and data communications coupled with new managerial philosophies that improve organizational and personal efficiency.

What is a manufacturing Cell? A manufacturing cell usually consists of

two or three processing workstations (typically CNC Machining or turning centers) plus a part handling system.

The following two slides contain a CAD layout and picture of the RIT Mfg Eng Tech Class of 2000’s manufacturing work cell.

Manufacturing Workcell (CAD)

Manufacturing Workcell

Manufacturing Cells VS FMS A FMS/FAS is a manufacturing cell,

but a cell is not necessarily a FMS/FAS

A FMS/FAS is a complete system that runs automatically

A manufacturing cell has some or most of the components of a FMS/FAS, but not all of them.

History of FMS 1950’s NC machines first appear 1960’s Computers appear in industry Later 1960’s Flexible Manufacturing

Systems first appeared in the U.S.A. at companies like Ingersoll-Rand, Caterpillar, John Deere, and General Electric Co.

Volume Vs Variety

Flexibility in a FMS/FAS Machine flexibility Production flexibility Mix flexibility Product flexibility Routing flexibility Volume flexibility Expansion flexibility

Components of an FMS/FAS Workstations Material handling and storage

system Computer control system People to manage and operate the

system

Types of Workstations Load/unload Stations Machining Stations Other Processing Stations Assembly Other Stations and Equipment (like

Inspection)

Layout Configurations for Material Handling System

In-line layout In-line Transfer Conveyor Rail guided vehicle

Loop layout Conveyor system In-Floor towline carts

Layouts Continued Ladder layout

Conveyor System Automated Guided Vehicle (AGV) Rail guided Vehicle

Open field layout AGV In-line towline carts

Robot-centered layout

Computer Control Systems Workstation Distribution of control instructions

to workstations Production control Traffic control Shuttle control Workpiece monitoring

Computer Controls (cont) Tool control

Tool locations Tool life monitoring

Performance monitoring and reporting

Diagnostics

Why Implement a FMS/FAS? Increased machine utilization Fewer machines required Reduction in factory floor space

required Greater responsiveness to change Reduced inventory requirements Lower manufacturing lead times

Why Implement a FMS/FAS? (continued)

Reduced direct labor requirements and higher labor productivity

Opportunity for unattended production

FMS Implementation Issues Part family considerations Processing requirements Physical characteristics or workparts Production volume Scheduling and dispatching Machine loading Part routing

FMS Issues (cont) Part grouping Tool management Pallet and fixture allocation Requires management

commitment and planning Major invest of time and money