group technology

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Presentation Transcript

GROUP TECHNOLOGY : 

GROUP TECHNOLOGY P.Natarajan, ME-ED 094ED110 BIT-Sathy, Tamilnadu India

Content : 

Content Overview of Group Technology Technology Definition Part Family Ways to Identify Part Families Parts Classification and Coding Part Design Attributes Part Manufacturing Attributes Types of GT cells Benefits of Group Technology

Overview of Group Technology : 

Overview of Group Technology Parts in the medium production quantity range are usually made in batches Disadvantages of batch production Downtime for changeovers High inventory carrying costs

GROUP TECHNOLOGY : 

GROUP TECHNOLOGY The parts are different, there are groups of parts that possess similarities part similarities by utilizing similar processes and tooling to produce them Manual or automation techniques Flexible manufacturing system is often use

Definition : 

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

Part Family : 

Part Family Similar geometric shape and size, or in the processing steps There are always differences among parts in a family Similarities are close enough that the parts can be grouped into the same family

Contd., : 

Contd., Two parts that are identical in shape and size but quite different in manufacturing (a)1,000,000 units/yr, tolerance = ±0.010 inch, 1015 CR steel, nickel plate (b)100/yr, tolerance = ±0.001 inch, 18-8 stainless steel

Contd., : 

Contd.,

Contd., : 

Contd., Different in size and shape, but quite similar in terms of manufacturing Turning, some parts require drilling and/or milling

Ways to Identify Part Families : 

Ways to Identify Part Families Visual inspection Production flow analysis Parts classification and coding

Parts Classification and Coding : 

Parts Classification and Coding Systems based on part design attributes Systems based on part manufacturing attributes Systems based on both design and manufacturing attribute

Part Design Attributes : 

Part Design Attributes Major dimensions Basic external shape Basic internal shape Length/diameter ratio Material type Part function Tolerances Surface finish

Part Manufacturing Attributes : 

Part Manufacturing Attributes Major process Operation sequence Batch size Annual production Machine tools Cutting tools Material type

Some of the important systems : 

Some of the important systems Opitz classification system Brisch System CODE CUTPLAN DCLASS Multiclass Part Analog System

Opitz Parts Classification and Coding System : 

Opitz Parts Classification and Coding System

Basic structure of the Opitz system of parts classification and coding : 

Basic structure of the Opitz system of parts classification and coding

Form code (digits 1-5) for rotational parts in the Opitz coding system : 

Form code (digits 1-5) for rotational parts in the Opitz coding system

part design shown define the "form code" using the Opitz system : 

part design shown define the "form code" using the Opitz system Step 1: The total length of the part is 1.75, overall diameter 1.25, L/D = 1.4 (code 1) Step 2: External shape - a rotational part that is stepped on both with one thread (code 5) Step 3: Internal shape - a through hole (code 1) Step 4: By examining the drawing of the part (code 0) Step 5: No auxiliary holes and gear teeth (code 0)

Irrotational part : 

Irrotational part

Machine Cell Designs (Types of GT cells) : 

Machine Cell Designs (Types of GT cells) Single machine (a) Multiple machines with manual handling (b) Multiple machines with mechanized handling (c) Flexible manufacturing cell (d) Flexible manufacturing system (e)

Benefits of Group Technology : 

Benefits of Group Technology Standardization of tooling, fixtures Material handling is reduce Process planning and production scheduling are simple Work-in-process and manufacturing lead time are reduce Improve worker satisfaction in a GT cell Higher quality work