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SLIDE-1

NON CONVENTIONAL MACHINES

SLIDE-2

  • INTRODUCTION
  • HISTORY AND DEVELOPMENT
  • NEWER MACHINING PROCESS
  • ADVANTAGES OF NEWER MACHINING
  • CATEGORIES OF NON CONVENTIONAL MACHINING
    • ELECTRICAL METHOD
    • THERMAL METHOD
    • CHEMICAL METHOD
  • APPLICATION OF NCM TECHNIQUES

 

SLIDE-3

INTRODUCTION

  • IT IS DIFFICULT TO MACHINE MATERIALS SUCH AS NITRO ALLOY, CARBIDES, STAINLESS STEEL, HEAT-RESISTING STEELS, ETC.
  • MANY OF THESE MATERIALS ARE USED DUE TO THEIR HIGH STRENGTH- TO-WEIGHT RATIO, HARDNESS, AND HEAT-RESISTING QUALITIES
  • SERIOUSNESS OF PROBLEMS BEING FACED IN MACHINING OF HARD AND HEAT RESISTANT MATERIAL IN 1960
  • CONVENTIONAL TOOL FOR METAL REMOVAL NOT USED
  • DIRECTLY UTILIZE SOME FORM OF ENERGY FOR METAL MACHINING
  • MERCHANT IN 1960’S EMPHASIZED THE NEED FOR THE DEVELOPMENT OF NEWER CONCEPTS IN METAL MACHINING.

 

SLIDE-4

HISTORY AND DEVELOPMENT

  • CONSEQUENTLY, NON-CONVENTIONAL MACHINING PROCESSES ARE ADOPTED
  • THESE PROCESSES ARE NON-CONVENTIONAL
  • THEY DO NOT EMPLOY A CONVENTIONAL TOOL FOR METAL REMOVAL
  • INSTEAD, THEY DIRECTLY UTILIZE SOME FORM OF ENERGY
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SLIDE-5

NEWER MACHINING PROCESS

  • IT DIFFERS FROM CONVENTIONAL MACHINING PROCESS
  • IN CONVENTIONAL MACHINING PROCESS A TOOL IS FORCED ON THE WORK-PIECE
  • IN THIS PROCESS, METAL REMOVAL TAKES PLACE DUE TO SHEARING ACTION
  • IN NEWER MACHINING PROCESS, TOOL NEED NOT TO BE HARDER THAN THE WORK-PIECE
  • WORK-PIECE IS NOT SUBJECTED TO UNDERGO ANY STRESS

 

SLIDE-6

ADVANTAGES OF NEWER MACHINING

  • INCREASES PRODUCTIVITY
  • REDUCED REJECTION
  • REDUCED BREAKAGE OF FRAGILE WORK-PIECES DURING PROCESS
  • WORK WITH CLOSE TOLERANCE, SMALL DIMENSIONS AND HOLES ARE POSSIBLE
  • THE TOOL MATERIAL NEED NOT BE HARDER THAN THE WORK-PIECE
  • THESE MACHINES CAN BE OPERATED BY CNC AND ADAPTIVE CONTROL IS ALSO POSSIBLE
  • ASSURES RELIABILITY AND REPEATABILITY OF COMPONENTS

 

SLIDE-7

ADVANTAGES OF NEWER MACHINING

  • HIGH STRENGTH TEMPERATURE RESISTANT (HSTR) MATERIAL, BOTH METALLIC AND NON-METALLIC CAN BE MACHINED, MARKED, WELDED AND CUT
  • THE MACHINED SURFACES DO NOT HAVE RESIDUAL STRESSES
  • COMPLEX  SHAPES CAN BE MACHINED

 

SLIDE-8

CATEGORIES OF NON CONVENTIONAL MACHINING

  • ELECTRICAL METHOD
    • PRINCIPLE OF LECTROLYSIS
    • ALSO CALLED ‘ANODE DISSOLUTION’
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SLIDE-9

CATEGORIES OF NON CONVENTIONAL MACHINING

  • THERMAL METHOD
    • REMOVES MATERIAL BY MELTING
    • VAPORIZATION CAUSED DUE TO THERMAL CHANGES

 

SLIDE-10

CATEGORIES OF NON CONVENTIONAL MACHINING

  • CHEMICAL METHOD
    • METHOD RELIES ON METALS THAT ARE EASILY REACATED BY SOME CHEMICALS FOR EROSION

 

SLIDE-11

APPLICATION OF NCM TECHNIQUES

  • AJM (ABRASIVE JET MACHINING)
    • SUITABLE FOR MACHINING SUPER ALLOYS
    • REFRACTORY MATERIALS SUCH AS CERAMICS AND GLASS
    • USED FOR MACHINING PLASTICS.

 

SLIDE-12

APPLICATION OF NCM TECHNIQUES

  • USM (ULRASONIC MACHINING)
    • GOOD MACHINING PERFORMANCE FOR REFRACTORY TYPE MATERIALS CERAMICS AND GLASS
    • USED FOR MACHINING PLASTICS.

 

SLIDE-13

APPLICATION OF NCM TECHNIQUES

  • EDM
    • USED FOR MACHINING STEEL, SUPER ALLOYS, TITANIUM AND REFRACTORY MATERIALS
    • CANNOT BE USED FOR MACHINING NON-CONDUCTING MATERIALS

 

SLIDE-14

APPLICATION OF NCM TECHNIQUES

  • ECM
    • USED FOR MACHINING STEEL AND SUPER ALLOYS
    • CANNOT MACHINE NON-CONDUCTING  MATERIALS LIKE CERAMICS, PLASTICS AND GLASS.

 

SLIDE-15

APPLICATION OF NCM TECHNIQUES

  • EBM (ELECTRON BEAM MACHINING)
    • MOST SUITABLE FOR MACHINING REFRACTORY MATERIALS
    • MEDIUM PERFORMANCE ON GLASS AND PLASTICS.
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SLIDE-16

APPLICATION OF NCM TECHNIQUES

  • LBM (LASER BEAM MACHINING)
    • CAN MACHINE ANY SUBSTANCE
    • SUITABLE FOR REFRACTORY MATERIALS SUCH AS CERAMICS
    • A MEDIUM PERFORMANCE ON GLASS AND PLASTICS

 

SLIDE-17

APPLICATION OF NCM TECHNIQUES

  • PAM (PLASMA ARC MACHINING)
    • SUITABLE FOR MACHINING ALUMINIUM, STEEL AND SUPER ALLOYS
    • NOT SUITABLE FOR MACHINING CERAMICS AND GLASS

 

SLIDE-18

THANK YOU

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