SHOP FLOOR CONTROL AND INTRODUCTION TO FMS
1. Shop floor control.
The systems that accomplish the production
planning, development of master schedule, capacity planning and materials
requirement planning is called shop floor control.
Shop floor control is defined as a method of
controlling the work in process in the factory.
2. Functions
of shop floor control – SFC;
§ Priority
control and assignment of shop orders
§ Maintain
information on work in process for MRP.
§ Monitor
shop order status information.
§ Provide
production output data for capacity control processes.
3. Modules
of SFC system;
§ Order
release
§ Order
scheduling
§ Order
progress
Purpose of order release in SFC;
The purpose of order release module is to provide
the necessary documentation that accompanies an order as it processed through
the shop. These documents collectively called as shop packets.
Purpose
of order scheduling in SFC;
The purpose of order scheduling is to make
assignments of the orders to various machines in the factory. Order scheduling
satisfies the first function of SFC. i.e. Priority control and assignment of
work orders.
Function
of order progress in SFC;
§ The order
progress module performs the remaining three functions of SFC.
§ To
provide data relative to work in process
§ Shop
order status
§ Capacity
control
4. Functions
of a Data Management system;
User functions:
§ Data
vault and document management
§ Process
and work flow management
§ Product
structure management
§ Data
classification and retrieval
§ Project
management
Utility functions:
§ Data
communication and notification
§ Data
transport
§ Data
translation
§ Image
services
§ System
administration
5. Factory
Data Collection System;
FDC system is used to collect data for monitoring
order progress in SFC. The following are important data collected by the FDC
system.
§ Number of
products (piece counts) completed at a certain machine.
§ Number of
parts scrapped (or) Number of parts reworked.
§ Direct
labor time spent
§ Equipment
breakdown.
6. Purpose
of data collection system;
The purpose of the data
collection system in shop floor control is to provide basic data for monitoring
order progress.
In computerized SFC system the data are submitted
to the order progress module for analysis and generation of work order status
reports and exception reports.
7. Types of
data collected from the shop floor;
§ Machine
data,
§ Operator
data,
§ Tooling
data,
§ Data
relating to jobs to be done,
§ Materials
data,
§ Materials
handling data,
§ Scheduling
data,
§ Process
planning data, and
§ Inspection
data.
8. Data
collection techniques in shop floor control;
§ Job
traveler
§ Employee
time sheet
§ Operation
tear strips or punched cards included with shop packet
§ Centralized
shop floor terminals
§ Individual
work centre terminals
9. Computer
process monitoring (Computer assisted data collection systems)
Computer process monitoring is a data collection
system in which the computer is directly connected to the workstation and
associated equipment for the purpose of observing the operation.
10.
Components used to build a computer process
monitoring system
§ Transducers
and sensors,
§ Analog to
digital converters (ADC),
§ Multiplexers,
§ Real time
clocks, and
§ Other
electronic devices
11.
Configurations of computer assisted data
collection systems
Or (Automated data collection system)?
§ Data
logging systems
§ Data
acquisition systems
§ Multilevel
scanning
12.
Types of data collection systems
§ On-line
data collection systems
§ Off-line
data collection systems
13.
Data acquisition system ( DAS )
The data acquisition system that
collects data from the various production operations for direct communication
to a central computer. Hence it is called as online system.
14. Automatic identification methods.
Automatic identification is a term that refers to
various technologies used in automatic or semi automatic acquisition of product
data for entry into a computer system.
15.
Technologies available for automatic
identification system
§ Bar
codes,
§ Radio
frequency systems,
§ Magnetic
stripes,
§ Optical
character recognition, and
§ Machine
vision.
16.
Classifications of bar codes according to the
dimensions of width
High density : X dimension is 0.010 in. or less.
Medium density : X dimension is between 0.010 and 0.030 in.
Low density : X dimension is 0.030 in. or greater.
17.
Types of bar code readers
§ Fixed
beam reader,
§ Moving
beam reader.
18.
Smart cards
§ Smart
cards are made of plastic.
§ They are
of the size of a credit card and are embedded with one or more microchips.
§ These
have a 8 bit or higher level microprocessors and a storage capacity of about
8kB-256kB. Personal identification numbers prevent their unauthorized use.
19.
Flexible manufacturing system – FMS;
A flexible manufacturing system consists of a
group of processing stations, interconnected by means of a automated material
handling and storage systems, and controlled by an integrated computer system.
20.
Components of FMS systems;
§ Processing
stations.
§ Material
handling and storage.
§ Computer
control system.
21.
Different FMS layout configurations
§ Inline
configuration,
§ Loop
configuration,
§ Ladder
configuration,
§ Open
field configuration and
§ Robot
centered cell.
22.
Types of FMS
§ Flexible
manufacturing module (FMM)
§ Flexible
manufacturing cell (FMC)
§ Flexible
manufacturing group (FMG)
§ Flexible
fabrication-machining-assembly system (FFMAS)
Related Topics
Privacy Policy, Terms and Conditions, DMCA Policy and Compliant
Copyright © 2018-2024 BrainKart.com; All Rights Reserved. Developed by Therithal info, Chennai.