Group Technology Introduction Presentation

7/25/2019 Group Technology Introduction Presentation

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GROUP TECHNOLOGY


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DEFINITION

Group technology is a manufacturingphilosophy in which similar parts are

identied and grouped together to takeadvantage of their similarities in designand production.


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Similar parts are arranged into partfamilies where each part family

possesses similar design ormanufacturing characteristics.

Grouping the production equipmentinto machine cells where each cellspecialises in the production of a partfamily is called cellular

manufacturing.


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CHALLENGE

I!entifying part familie"

-grouping parts into families is

time consuming.

Re#arranging pr$!ucti$n mac%ine

int$ mac%ine cell" -time consuming and costly.

-machines idle duringchangeover.


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&ENEFIT TO

CO'PANIE GT promotes standardising of tooling,

xtures and setups.

aterial handling is reduced !ecauseparts are moved over minimum distance.

Setup times are reduced.

"ork in process is reduced.

"orker satisfaction is improved.

#rocess planning, production schedulingare simplied.


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PART FA'ILIE

$ part family is a collection of parts thatare similar either !ecause of geometric

shape and si%e or !ecause similarprocessing steps are required in theirmanufacture.

#arts within a family are di&erent !uttheir similarities are close enough tomerit their inclusion as mem!ers of thepart family.


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GROUPING THE PART

'isual inspection

#art classication and coding

#roduction (ow analysis


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(IUAL INPECTION

)nvolves the classication of parts intofamilies !y looking at either the

physical parts or their photographs andassem!ling them into groups.

The method is the least sophisticatedand least expensive method.


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PART CLAIFICATIONAND CODING

Similarities among parts are identiedand these similarities are related in

coding system.

Two categories of part similarities

-design attri!utes -manufacturing attri!utes


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REAON FOR UING ACODING HE'E

De"ign Retrie)al*

simple change in existing part would takemuch less time than designing a whole new part

from scratch. Aut$mate! pr$ce"" %an!ling*

search for process plans for existingparts with identical or similar codes.

'ac%ine cell !e"ign*

to design machine cells capa!le ofproducing all mem!ers of a particular partfamily.


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Part" cla""i+cati$n an!c$!ing "y"tem"

Systems !ased on part designattri!utes.

Systems !ased on manufacturingattri!utes.

Systems !ased on !oth design andmanufacturing attri!utes.


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PART DEIGNATTRI&UTE

*asic external shape

*asic internal shape

+otational or +ectangular shape

ength to diameter ratio

$spect ratio

aterial type

a/or dimensions inor dimensions

Tolerance

Surface nish


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PART 'ANUFACTURINGATTRI&UTE

a/or processes

inor operations

0peration sequence achine tool

#roduction cycle time

1ixtures required 2utting tools

*atch si%e


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TRUCTURE INCLAIFICATION AND CODING

Hierarc%ical "tructure*

)nterpretation of each successive

sym!ol depends on the value of thepreceding sym!ols.

C%ain type "tructure*

)nterpretation of each sym!ol in the

sequence does not depend on the valuepreceding sym!ols.

'i,e!#m$!e "tructure*

3y!rid of the two codes.


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CODING YTE'

0plit% classication system

*risch system

2045 26T#$7

42$SS

ulticlass #art analog system


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OPLIT- CLAIFICATIONYTE'

4eveloped !y 3.0plit%

89:;< =>?@ $*24

10+ 2045A

1irst ve digits89:;?@

anufacturing attri!utes.

S52074$+B 2045A

$*24

#roduction operation type and sequence.


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Pr$!ucti$n Fl$. Analy"i"/PFA0

#1$ is a method for identifying partfamilies and associated machine

groupings that uses the information ofproduction route sheets rather thanpart drawings.

"ork parts with identical routings are

classied into part familes.


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Pr$ce!ure $f PFA

4ata collection

Sortation of process routings

#1$ chart

2luster analysis


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DATA COLLECTION

#art no. C operation sequence are theminimum required data which can !e

o!tained from route sheets oroperation sheets which is also knownas Shop documents.

$dditional data such as ot si%e, time

standards, annual demand will !euseful for designing machine cells withrequired production capacity.


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ORTATION OF PROCEROUTING

)n this step, the parts are arranged intogroups according to the similarity of

their process routings.

To facilitate this step, all operations ormachines included in the shop arereduced to code num!ers.


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PFA CHART

This chart is a ta!ulation of the process ormachine code num!ers for all the partpacks.

#art-machine incidence matrix

Di/E8

part i requires operation on machine /.

Di/EF

#art i is does not require operation onmachine /.


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CLUTER ANALYI

+elated groupings are identied and

re-arranged into a new pattern that

!rings together packs with similarmachine sequences.


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APPLICATION OF GT

#rocess planning

7ew parts process plan is taken fromexisting part families.

odular xture

4esign of common !ase xture whichcan !e used for di&erent parts in the family.

#arametric programming

2ommon 72 program for entire partfamily.


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THAN1 YOU

Group Technology Introduction Presentation

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