Planning in production systems

Slovak University of TechnologyFaculty of Material Science and Technology in Trnava

Development of automation engineering manufacture conventional machines

conventional machines - NC machines - CNC a DNC control - flexible production systems PPS - CIM computer integrated manufacturing

CNC (Computer Numerical Control) control system of production device, which is connected direct to the local control microcomputer, where is the own program saved

DNC (Distributed Numerical Control) is characteristic by flexible distributed control of

several production machines from one center.

Dev

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pro

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Mechanization

Computer control

Data networks

Computer integration

Program control

Term 1950 1970 1960 1980 1990

Figure 1: Development of production systems

Main components of production system – subsystems technological – geometric and physical – chemical

attributes change of the component transportation and handling – set of transportation and

handling tools to material, semi finished products and components movement between single workplaces of production process

store system – input, interoperated and output stores check - input, interoperated and output control control and information – set of control and informational

tools

Production system

Production system

Transportationand handling subsystem

Transportationand handling subsystem

Store subsystemStore subsystem

Technological subsystem

Technological subsystem

Control subsystem

Control subsystem

Managing and information subsystem

Managing and information subsystem

Figure 2: Components of the production system

Flexible Manufacturing Systems has open character, manufacturing orders can

be awarded continuously during planning period mutually interchangeable workplaces manufacturing orders can be splitted up into

parallel workplaces during planning period occur to failures possible alternative technical procedure minimally manual strikes minimal time to conversion

Main parts of the PVS processing NC a CNC devices to interoperating transport and

manipulation devices to operating transport – purpose

devices, manipulators, industrial robots components and tools carriers – Setting and

positioning problem is solved, establishment and fixing components

PVS tasks - provide especially production control

harmonization main and helping activities control manufacturing quality monitoring a scan

transport and storing - resolution store spoil, transport roads

PVS disadvantages high capital costs complex control system risk haywire of individual devices and thereby too

entire system

Elastic production system (PVS) mono or various technological devices with

system to ensure his functions in mechanical regime

automated production system, wherein oneself change production schedule solve by changing dating base

is possible to divide him into following parties: elastic production complex elastic Computer Integrated Manufacturing automated cartage - store system

PVS by organizational structure elastic production cell

plicate from technological machinery with code control with resources of the automation technological process, which works autonomous

elastic automated line includes several production cells arrange in order of

sequence technological operations and controlled by one direction system

elastic automated working to product certain assortment parts

elastic automated plant

Production planning in PVS working-out monthly operational plan products

for PVS designation basic terms and advances for preparation

production, safety and preparation of material, tools, documentation, subdelivery and co-operation

operational plan his part -> orientation terms commencement and

ending production at his base and real state in PVS oneself work out

short-time operational plan

short-time operational plan designates commencement and ending production

individual productional batches establishes priority of individual operations worked out weekly on fortnightly period