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PRESENTATION ON

GROUP TECHNOLOGY

PREPARED BY -

CHINTAN SHAH (06DME027)

JAIMIN PATEL (06DME031)



WHAT IS GROUP TECHNOLOGY

Group Technology is a manufacturing philosophy inwhich the parts having similarities (Geometry ,manufacturing process and/or function) are grouped

together to achieve higher level of integration betweenthe design and manufacturing function of a firm.

AIM –

To reduce work-in-progress

Improve delivery performance by reducing leadtimes.



WHAT IS GROUP TECHNOLOGY

Group Technology is an engineering andmanufacturing methodology that groupthe parts together based on their

similarities in order to achieve economiesof scale in job & batch production system.

It is the technique for manufacturing smallto medium lot size batches of parts ofsimilar process, geometry, size & shape.



GT is based on general principle that manyproblems are similar and by grouping similar

problem a single solution can be found to a setof problem thus saving time & effort.

The group of similar part is known as PARTFAMILY

The group of machinery used to process an

individual part family is known as MACHINECELL



Lathe m/c Drilling m/c Grinding m/c Assembly

AssemblyDrilling m/cMilling m/c

AssemblyGrinding m/cMilling m/c

GROUP LAYOUT WHERE MACHINE ARE ARRANGED AS PER PROCESS



METHOD OF GROUP CLASSIFICATION

Visual Inspection

Classification & Coding

Production Flow analysis.



Visual Inspection

In this method are classified on the basis ofvisual judgment. It involves arranging the partsinto families by visually examining the physical

parts or their photographs. It is achieved byphotographing parts using scale and sorting intoclasses by eye.

This method is carried out by experts.

This is an inexpensive & less Accurate method.



Classification & Coding

Coding is define as process of allocatingsymbol to the parts. The symbol representdesign characteristics of parts ,

manufacturing attributes or both

Classification is the process dividing theset of parts into part family.



There are 3 construction method forcode.

1. Mono code

2. Poly code

3. Mix or Hybrid code.



Mono code :

It means the interpretation of each

succeeding symbol depends upon thevalue of the proceeding symbol

Here the first group indicates the majorgroups such as casted part , machinedpart , sheet metal parts etc. The seconddigit may indicates the shape of partssuch as rotational , rectangular etc.

The main benefit of this type ofmethod is that it provides largeinformation in a short code.



POLYCODE

This is a fixed position code where each classhas a fixed position and code independent ofother classes.

This is most suitable method whenmanufacturing processes have to be described.



Interpretation of different code

Code Interpretation

1 Material2 Material shape

3 Material chemistry

4 Production quantity

5 Surface finish

6 Tolerance

7 Machine element orientation



Mixed or hybrid code

Combinatation of mono code & poly code

There are 3 types of part classification &

coding system which are mostly use byorganization.

1. Optiz classification system

2. MICLASS system3. Code system



Optiz classification system

Form code :

it define design attributes such aspart geometry , dimensions & features. This are

first 5 codes “12345” Supplementary code :

this are describemanufacturing attributes such as information

related to raw material , tolerance , surfacefinish & accuracy. This are represented afterform code by next 4 digit “6789”



Secondary code :

This are use to identify the

production process & sequence. This aredenoted by 4 alphabets “ABCD”



MICLASS SYSTEM

This type of part classification & coding methodhelps to automate & standardize no of design ,manufacturing & management function.

It name stands for metal institute classificationsystem.

It consist of 12 to 30 digit. the first 12 digit arestandard & can be use for any part & other 18digit can be use as per requirement of company



INTERPRETATION OF DIFFERENT DIGIT

DIGITS INTERPRETATION

1 Main shape

2 , 3 Shape element

4 Position of shape

5 , 6 Element

7 Main dimensions

8 Dimension ratio

9 , 10 Auxiliary dimension

11 ,12 Tolerance code & Material code



Production Flow analysis

It is used to eliminate all necessary routes, or material flow paths , in order to findout the simplest material system.

In this method route sheet is used to findout the sequence of operation to becarried out on different machine tool



MACHINE CELL DESIGN

The concept of GT can be implementedeffectively in cellular manufacturing whichconsists of one or more manufacturing or

machine cells. Machine cell may be defined as a group of

closely located workstations where multiple ,sequential operation are performed on one or

more families of similar raw material , parts ,components , products or information carrrier.



ADVANTAGES OF GT.

Reduction in number of drawings

Reduction in set up and production time

Improved machine loading

Reduces manufacturing lead time Leads to automated process planning

Less material movement

Reduces change in set up

Better utilisation of tools and equipments

Less number of defects and rejections



LIMITATIONS

High cost of implementation.

Rearranging of machine is very difficultand time consuming process.

There are large number of grouptechnology codes.

It is not be suitable when very widevarieties of product are manufactured



THANK YOU

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