PRESENTATION ONPRESENTATION ON

GROUP TECHNOLOGYGROUP TECHNOLOGY

PREPARED BYPREPARED BY - -CHINTAN SHAH CHINTAN SHAH (06DME027)(06DME027)

JAIMIN PATEL (06DME031) JAIMIN PATEL (06DME031)

WHAT IS GROUP TECHNOLOGYWHAT IS GROUP TECHNOLOGY

Group Technology is a manufacturing philosophy in Group Technology is a manufacturing philosophy in which the parts having similarities (Geometry , which the parts having similarities (Geometry , manufacturing process and/or function) are manufacturing process and/or function) are grouped together to achieve higher level of grouped together to achieve higher level of integration between the design and manufacturing integration between the design and manufacturing function of a firm.function of a firm.

AIM – AIM –

To reduce work-in-progress To reduce work-in-progress

Improve delivery performance by reducing lead Improve delivery performance by reducing lead times. times.

WHAT IS GROUP TECHNOLOGYWHAT IS GROUP TECHNOLOGYGroup Technology is an engineering and Group Technology is an engineering and

manufacturing methodology that group manufacturing methodology that group the parts together based on their the parts together based on their similarities in order to achieve similarities in order to achieve economies of scale in job & batch economies of scale in job & batch production system.production system.

It is the technique for manufacturing It is the technique for manufacturing small to medium lot size batches of parts small to medium lot size batches of parts of similar process, geometry, size & of similar process, geometry, size & shape.shape.

GT is based on general principle that many GT is based on general principle that many problems are similar and by grouping problems are similar and by grouping similar problem a single solution can be similar problem a single solution can be found to a set of problem thus saving time found to a set of problem thus saving time & effort.& effort.

The group of similar part is known as PART The group of similar part is known as PART FAMILYFAMILY

The group of machinery used to process The group of machinery used to process an individual part family is known as an individual part family is known as MACHINE CELLMACHINE CELL

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 CLASSIFICATIONMETHOD OF GROUP CLASSIFICATION

Visual InspectionVisual InspectionClassification & CodingClassification & CodingProduction Flow analysis.Production Flow analysis.

Visual InspectionVisual Inspection

In this method are classified on the basis In this method are classified on the basis of visual judgment. It involves arranging of visual judgment. It involves arranging the parts into families by visually the parts into families by visually examining the physical parts or their examining the physical parts or their photographs. It is achieved by photographs. It is achieved by photographing parts using scale and photographing parts using scale and sorting into classes by eye. sorting into classes by eye.

This method is carried out by experts.This method is carried out by experts. This is an inexpensive & less Accurate This is an inexpensive & less Accurate

method.method.

Classification & CodingClassification & Coding

Coding is define as process of Coding is define as process of allocating symbol to the parts. The allocating symbol to the parts. The symbol represent design symbol represent design characteristics of parts , characteristics of parts , manufacturing attributes or bothmanufacturing attributes or both

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

There are 3 construction method for There are 3 construction method for code. code.

1.1. Mono code Mono code

2.2. Poly code Poly code

3.3. Mix or Hybrid code.Mix or Hybrid code.

Mono code : Mono code : It means the interpretation of each It means the interpretation of each

succeeding symbol depends upon the succeeding symbol depends upon the value of the proceeding symbolvalue of the proceeding symbol

Here the first group indicates the Here the first group indicates the major groups such as casted part , major groups such as casted part , machined part , sheet metal parts etc. machined part , sheet metal parts etc. The second digit may indicates the The second digit may indicates the shape of parts such as rotational , shape of parts such as rotational , rectangular etc. rectangular etc.

The main benefit of this type of The main benefit of this type of method is that it provides large method is that it provides large information in a short code.information in a short code.

POLYCODEPOLYCODE

This is a fixed position code where each This is a fixed position code where each class has a fixed position and code class has a fixed position and code independent of other classes.independent of other classes.

This is most suitable method when This is most suitable method when manufacturing processes have to be manufacturing processes have to be described.described.

Interpretation of different Interpretation of different codecode

CodeCode InterpretationInterpretation

11 Material Material

22 Material shape Material shape

33 Material chemistryMaterial chemistry

44 Production quantityProduction quantity

55 Surface finishSurface finish

66 Tolerance Tolerance

77 Machine element orientationMachine element orientation

Mixed or hybrid codeMixed or hybrid code

Combinatation of mono code & poly codeCombinatation of mono code & poly code

There are 3 types of part classification & There are 3 types of part classification & coding system which are mostly use by coding system which are mostly use by organization.organization.

1.1. Optiz classification systemOptiz classification system

2.2. MICLASS system MICLASS system

3.3. Code systemCode system

Optiz classification systemOptiz classification system

Form code : Form code : it define design attributes such it define design attributes such

as part geometry , dimensions & features. as part geometry , dimensions & features. This are first 5 codes “12345”This are first 5 codes “12345”

Supplementary code :Supplementary code : this are describe this are describe

manufacturing attributes such as manufacturing attributes such as information related to raw material , information related to raw material , tolerance , surface finish & accuracy. This tolerance , surface finish & accuracy. This are represented after form code by next 4 are represented after form code by next 4 digit “6789”digit “6789”

Secondary code : Secondary code :

This are use to identify the This are use to identify the production process & sequence. This production process & sequence. This are denoted by 4 alphabets “ABCD”are denoted by 4 alphabets “ABCD”

MICLASS SYSTEM MICLASS SYSTEM

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

It name stands for metal institute classification It name stands for metal institute classification system.system.

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

INTERPRETATIONINTERPRETATION OF DIFFERENT DIGIT OF DIFFERENT DIGIT

DIGITS DIGITS INTERPRETATIONINTERPRETATION

11 Main shapeMain shape

2 , 32 , 3 Shape element Shape element

44 Position of shapePosition of shape

5 , 65 , 6 Element Element

77 Main dimensionsMain dimensions

88 Dimension ratioDimension ratio

9 , 109 , 10 Auxiliary dimension Auxiliary dimension

11 ,1211 ,12 Tolerance code & Material codeTolerance code & Material code

Production Flow analysisProduction Flow analysis

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

In this method route sheet is used to In this method route sheet is used to find out the sequence of operation to find out the sequence of operation to be carried out on different machine be carried out on different machine tooltool

MACHINE CELL DESIGNMACHINE CELL DESIGN

The concept of GT can be implemented The concept of GT can be implemented effectively in cellular manufacturing which effectively in cellular manufacturing which consists of one or more manufacturing or consists of one or more manufacturing or machine cells.machine cells.

Machine cell may be defined as a group of Machine cell may be defined as a group of closely located workstations where closely located workstations where multiple , sequential operation are multiple , sequential operation are performed on one or more families of performed on one or more families of similar raw material , parts , components , similar raw material , parts , components , products or information carrrier. products or information carrrier.

ADVANTAGES OF GT.ADVANTAGES OF GT.

Reduction in number of drawingsReduction in number of drawings Reduction in set up and production timeReduction in set up and production time Improved machine loadingImproved machine loading Reduces manufacturing lead time Reduces manufacturing lead time Leads to automated process planning Leads to automated process planning Less material movement Less material movement Reduces change in set up Reduces change in set up Better utilisation of tools and equipmentsBetter utilisation of tools and equipments Less number of defects and rejections Less number of defects and rejections

LIMITATIONSLIMITATIONS

High cost of implementation.High cost of implementation.Rearranging of machine is very Rearranging of machine is very

difficult and time consuming process.difficult and time consuming process.There are large number of group There are large number of group

technology codes.technology codes. It is not be suitable when very wide It is not be suitable when very wide

varieties of product are varieties of product are manufactured manufactured

THANK YOUTHANK YOU